WO2020071142A1 - Stoker-type incineration equipment, and method for incinerating to-be-incinerated matter - Google Patents

Abstract

This stoker-type incineration equipment comprises: a stoker (11) for transporting to-be-incinerated matter (M); a combustion gas flow path frame (16) in which there is formed a combustion gas flow path (17) for guiding a combustion gas (Gc) generated due to combustion of the to-be-incinerated matter upward; a combustion air supply part for supplying combustion air to the to-be-incinerated matter in the stoker; and a mixed gas supply part (30) for sending at least one gas, from among a part of the combustion air and a part of the combustion gas, into the combustion gas flow path as a mixed gas (Gm). The mixed gas supply part has a nozzle (40) for jetting the mixed gas into the combustion gas flow path. The opening area of a jetting opening in the nozzle, the jetting opening being used for jetting the mixed gas, is at least 7850 mm2 and no more than 49060 mm2.

Description

Stoker type incineration equipment and incineration method of incinerated material

The present disclosure relates to a stoker-type incineration facility and an incineration method of an incinerated material.
Priority is claimed on Japanese Patent Application No. 2018-190390 filed on October 5, 2018, the content of which is incorporated herein by reference.

The stoker-type incineration equipment is composed of a stoker that conveys incineration materials such as refuse, a furnace that covers the stoker, and a combustion gas flow that has a combustion gas flow path that guides combustion gas generated by the combustion of the incineration material upward. A road frame. Inside the furnace, a combustion chamber in which the incinerated matter is burned is formed. The combustion gas channel frame is connected to the upper end of the furnace.

As such a stoker-type incineration facility, for example, there are facilities described in Patent Documents 1 to 3 below. In the facilities described in these Patent Documents 1 to 3, the inside of the furnace is a primary combustion chamber in which the incineration material burns, and the downstream part in the combustion gas flow path is a secondary combustion chamber. A gas containing oxygen is supplied from a nozzle. In these facilities, the nozzle is fixed to the combustion gas channel frame so that the main ejection direction of gas from the nozzle is horizontal.

In these facilities, by injecting gas from the nozzle into the secondary combustion chamber, unburned components of the incineration that could not be completely burned in the primary combustion chamber are burned, thereby increasing the combustion efficiency of the incineration. I have.

Japanese Patent No. 3210859 Japanese Patent No. 5084581 Japanese Patent No. 5219468

(4) Businesses and others who incinerate incinerated materials are demanding that the incinerated materials have higher combustion efficiency.

Therefore, an object of the present disclosure is to provide a technique capable of increasing the combustion efficiency of the incinerated material.

The stoker-type incineration plant according to one embodiment of the present disclosure for achieving the above object,
A stoker that conveys the incineration material in a direction having a horizontal component, a furnace that covers the stoker and incinerates the incineration material on the stoker, and combustion that guides a combustion gas generated by the combustion of the incineration material upward. A combustion gas flow path frame formed with a gas flow path and connected to the furnace so as to be located above a part of the stoker; and combustion air for supplying combustion air to the incinerated material on the stoker. A supply unit, a mixing gas supply unit that sends at least one gas out of the combustion air and the combustion gas into the furnace or the combustion gas flow path as a mixing gas, Is provided. The mixing gas supply unit has one or more nozzles for jetting the mixing gas into the furnace or into the combustion gas flow path. The opening area of the ejection port for ejecting the mixing gas in the nozzle is 7850 mm ² or more and 49060 mm ² or less.

In the present aspect, the gas for mixing ejected from the nozzle can reach the top of the flame or a position above the top of the flame. For this reason, in this aspect, the mixing ratio of the mixing gas into the combustion gas can be increased, and the combustion efficiency of the unburned portion contained in the combustion gas can be increased.

Further, a stoker-type incinerator of another aspect according to the present disclosure for achieving the above object,
A stoker that conveys the incineration material in a direction having a horizontal component, a furnace that covers the stoker and incinerates the incineration material on the stoker, and combustion that guides a combustion gas generated by the combustion of the incineration material upward. A combustion gas flow path frame formed with a gas flow path and connected to the furnace so as to be located above a part of the stoker; and combustion air for supplying combustion air to the incinerated material on the stoker. A supply unit, a mixing gas supply unit that sends at least one gas out of the combustion air and the combustion gas into the furnace or the combustion gas flow path as a mixing gas, Is provided. The mixing gas supply unit includes a plurality of nozzles that eject the mixing gas into the furnace or the combustion gas flow path, and a flow controller that adjusts a flow rate of the mixing gas that ejects from the plurality of nozzles. And an information acquisition unit for acquiring flame formation region information for grasping a flame formation region formed by combustion of the incinerated material on the stoker. The plurality of nozzles are arranged in a direction having a horizontal component. The flow controller adjusts a flow rate of the mixing gas ejected from a plurality of nozzles based on the flame formation region information acquired by the information acquisition unit.

領域 The flame formation area changes according to the amount of water in the incineration material. When the mixing gas is ejected from the mixing gas nozzle, the static pressure around the mixing gas decreases, so that the flame is drawn near the ejected mixing gas. Therefore, when the flow rate of the mixing gas ejected from the nozzle is increased to increase the flow rate of the mixing gas, the effect of drawing the flame by the mixing gas can be enhanced. Therefore, in the above aspect having the information acquisition unit, even when a flame is not formed in the most preferable area, the flame formation area can be made closer to the most preferable area.

Further, a stoker-type incinerator according to still another aspect of the present disclosure for achieving the object,
A stoker that conveys the incineration material in a direction having a horizontal component, a furnace that covers the stoker and incinerates the incineration material on the stoker, and combustion that guides a combustion gas generated by the combustion of the incineration material upward. A combustion gas flow path frame formed with a gas flow path and connected to the furnace so as to be located above a part of the stoker; and combustion air for supplying combustion air to the incinerated material on the stoker. A supply unit, a mixing gas supply unit that sends at least one gas out of the combustion air and the combustion gas into the furnace or the combustion gas flow path as a mixing gas, Is provided. The mixing gas supply unit has a nozzle for jetting the mixing gas into the furnace or into the combustion gas flow path. The nozzle is provided so that the mixing gas can be directed to a top of a flame formed by combustion of the incineration material on the stoker.

燃 焼 Combustion gas immediately after generation contains unburned components. In this embodiment, where the mixing gas is directed to the top of the flame, the mixing gas from the mixing gas nozzle may be supplied to the top of the flame. That is, in this embodiment, the mixing gas containing oxygen is supplied to the combustion gas immediately after generation. Therefore, in this embodiment, the unburned portion in the combustion gas can be burned with oxygen contained in the mixing gas immediately after the generation of the combustion gas. Moreover, in this embodiment, the mixed gas containing oxygen can be supplied over a wide range in the vertical direction. Therefore, in this embodiment, at least a part of the unburned portion in the combustion gas is burned immediately after the generation of the combustion gas.

と When the mixing gas is ejected from the mixing gas nozzle, the static pressure around the mixing gas is reduced, so that the top of the flame is drawn near the ejected mixing gas. For this reason, in the above embodiment, even when the flame is not formed in the most preferable region, the flame formation region can be made closer to the most preferable region.

In order to achieve the object, an incineration method of an incinerator according to one embodiment of the present disclosure includes:
A stoker that conveys the incineration material in a direction having a horizontal component, a furnace that covers the stoker and incinerates the incineration material on the stoker, and combustion that guides a combustion gas generated by the combustion of the incineration material upward. A combustion gas flow path frame formed with a gas flow path and connected to the furnace so as to be located above a part of the stoker; and combustion air for supplying combustion air to the incinerated material on the stoker. In the incineration method of the incineration material in a stoker-type incineration facility comprising a supply unit, a part of the combustion air and a part of the combustion gas, at least one gas is used as a mixing gas from a plurality of nozzles. A mixing gas supply step for sending the gas into the furnace or into the combustion gas flow path is performed. The opening area of the ejection port for ejecting said mixed gas at a plurality of said nozzles is 49060Mm ² or less 7850Mm ² or more. The mixing gas supply step includes a flow rate adjusting step of adjusting the flow rate of the mixing gas such that the flow rate of the mixing gas ejected from the plurality of nozzles is not less than 20 m / s and not more than 90 m / s.

The incineration method of the incinerated material of another aspect according to the present disclosure to achieve the object,
A stoker that conveys the incineration material in a direction having a horizontal component, a furnace that covers the stoker and incinerates the incineration material on the stoker, and combustion that guides a combustion gas generated by the combustion of the incineration material upward. A combustion gas flow path frame formed with a gas flow path and connected to the furnace so as to be located above a part of the stoker; and combustion air for supplying combustion air to the incinerated material on the stoker. A supply unit, and in the incineration method of the incineration material in a stoker-type incineration facility comprising: a part of the combustion air and a part of the combustion gas, at least one gas as a mixing gas in the furnace or A mixing gas supply step to be sent into the combustion gas flow path is performed. In the mixing gas supply step, the mixing gas is sent into the combustion gas flow path such that the mixing gas is directed to a top of a flame formed by combustion of the incinerated material on the stoker.

According to one embodiment of the present disclosure, it is possible to increase the combustion efficiency of the incinerated material.

1 is a system diagram of a stoker-type incineration facility according to a first embodiment of the present disclosure. 1 is a front view of a mixing gas nozzle according to a first embodiment of the present disclosure. It is the graph obtained by CFD analysis, and shows the relationship between the distance in the main ejection direction from the mixing gas nozzle, and the flow velocity of the mixing gas in the main ejection direction for each mixing gas nozzle having different inner diameters of the ejection ports. It is a graph. 7 is a graph obtained by CFD analysis, showing a relationship between the height from the top of the stoker and the dispersion of oxygen concentration for each mixing gas nozzle having different inner diameters of the ejection ports. It is explanatory drawing which shows the dimension of each part of the combustion gas flow path frame determined as the conditions at the time of CFD analysis. It is the graph obtained by CFD analysis, and is a graph which shows the relationship between CO concentration and height. 4 is a graph obtained by CFD analysis, showing a relationship between a jet coverage and an outlet CO concentration. It is a system diagram of a stoker type incineration facility in a second embodiment of the present disclosure. It is an explanatory view showing the composition of the angle change mechanism and the installation height change mechanism in the second embodiment of the present disclosure. It is a functional block diagram of a controller in a second embodiment of the present disclosure. It is a flowchart which shows operation | movement of the gas supply part for mixing in 2nd embodiment of this indication. It is a front view of the 1st modification of a gas nozzle for mixing. It is a front view of the 2nd modification of a gas nozzle for mixing. 9 shows a third modification of the mixing gas nozzle. FIG. 2A is a front view of the mixed gas nozzle. FIG. 1B is a sectional view taken along line BB in FIG. 1A. It is explanatory drawing which shows the modification of arrangement | positioning of a mixed gas nozzle.

各種 Various embodiments and modifications of the stoker-type incinerator according to the present disclosure will be described with reference to the drawings.

"First embodiment of stoker type incinerator"
Hereinafter, a first embodiment of a stoker-type incineration facility according to the present disclosure will be described with reference to FIGS.

As shown in FIG. 1, the stoker-type incinerator of the present embodiment utilizes the heat of a stoker-type incinerator 1 that burns incinerators M such as refuse and the combustion gas Gc generated by the combustion of the incinerators M. Heat recovery boiler 2 that generates steam by heating, a cooling tower 3 that lowers the temperature of combustion gas Gc from exhaust heat recovery boiler 2, a combustion gas processor (combustion gas processing unit) 4, and an exhaust gas passage A frame 5 and a chimney 6 for exhausting the exhaust gas Ge to the outside are provided.

The cooling tower 3 has a tower body in which a space through which the combustion gas Gc flows is formed, and a cooling medium ejector for ejecting a cooling medium such as water into the space in the tower body. The combustion gas processor (combustion gas processing unit) 4 is, for example, a dust collector or a denitration device. The exhaust gas passage frame 5 connects the combustion gas processor 4 and the chimney 6. The combustion gas Gc that has passed through the combustion gas processor 4 passes through the exhaust gas flow path frame 5 as the exhaust gas Ge, reaches the chimney 6, and is exhausted from the chimney 6 to the outside.

The stoker type incinerator 1 includes a hopper 10, a stoker 11, a furnace 12, a combustion gas passage frame 16, a primary combustion air supply unit 20, a secondary combustion air supply unit 25, and a mixing gas supply. And a unit 30.

The hopper 10 is a frame for receiving the incineration material M from outside. The stoker 11 receives the incineration material M from the hopper 10 and transports the incineration material M in the transport direction Dt having the horizontal direction Dh component. The furnace 12 covers the stoker 11 and forms a primary combustion chamber 13 in which the incineration material M on the stoker 11 burns. The furnace 12 is formed with a receiving port 14 for receiving the incinerated material M from the hopper 10 and an outlet 15 for discharging incinerated residues such as ash remaining after burning of the incinerated material M. The receiving port 14 is formed on one side of the furnace 12 in the transfer direction Dt (hereinafter, referred to as a transfer direction upstream side Dtu). The discharge port 15 is formed on the other side of the furnace 12 in the transport direction Dt (hereinafter, referred to as a downstream side Dtd in the transport direction). The combustion gas flow path frame 16 forms a combustion gas flow path 17 for guiding the combustion gas Gc generated by the combustion of the incineration material M upward. The combustion gas channel frame 16 is connected to the upper end of the furnace 12 so as to be located above a part of the stoker 11. The lower space in the combustion gas flow path frame 16 forms a secondary combustion chamber 18. The combustion gas Gc that has passed through the combustion gas passage 17 is guided to the exhaust heat recovery boiler 2.

The primary combustion air supply unit 20 includes an air supply unit 21 and a plurality of wind boxes 22. The air supply device 21 includes a push-in blower that blows in outside air, and an air heater that heats air from the push-in blower. The plurality of wind boxes 22 are arranged in the transport direction Dt. Each of the plurality of wind boxes 22 guides the air from the air supply device 21 from below the stoker 11 to the incineration material M on the stoker 11 as primary combustion air Ga1.

The secondary combustion air supply unit 25 performs secondary combustion on the plurality of secondary combustion air nozzles 29 for ejecting the secondary combustion air Ga2 into the combustion gas flow path 17 and the plurality of secondary combustion air nozzles 29. A secondary combustion air line 26 that guides the secondary combustion air Ga2, and a flow controller 27 that regulates the flow rate of the secondary combustion air Ga2 ejected from the plurality of secondary combustion air nozzles 29. The plurality of secondary combustion air nozzles 29 are attached to the combustion gas flow channel frame 16 along the circumferential direction Dc with respect to the flow axis Ap extending through the center of the combustion gas flow channel 17 in the horizontal cross section and extending in the vertical direction Dv. ing. The secondary combustion air line 26 has a first end 26a connected to the above-described air supply device 21 and a second end 26b connected to a plurality of secondary combustion air nozzles 29. Therefore, the air from the air supply device 21 is sent to the secondary combustion air nozzle 29 as the secondary combustion air Ga2. The flow controller 27 has a flow control valve 28 provided for each of the plurality of secondary combustion air nozzles 29. The flow control valve 28 is provided in the secondary combustion air line 26.

The mixing gas supply unit 30 sends at least one of a part of the combustion air Ga and a part of the combustion gas Gc into the furnace 12 or the combustion gas passage 17 as a mixing gas Gm. The mixing gas supply unit 30 includes a plurality of mixing gas nozzles 40 that eject the mixing gas Gm into the combustion gas channel 17, and a mixing gas line 31 that guides the mixing gas Gm to the plurality of mixing gas nozzles 40. And a flow controller 32 for adjusting the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40. The plurality of mixing gas nozzles 40 are attached to the combustion gas flow channel frame 16 along the circumferential direction Dc (direction having a horizontal component) with respect to the flow channel axis Ap. The mixing gas line 31 has a first end 31a connected to a supply source of the mixing gas Gm, and a second end 31b connected to a plurality of mixing gas nozzles 40. Specifically, the second end 31b of the mixing gas line 31 is connected to at least one of the air supply device 21, the end of the furnace 12 on the downstream side Dtd in the transport direction, and the exhaust gas flow path frame 5. It is connected. Therefore, the mixing gas nozzle 40 receives fresh air from the air supply device 21, the combustion gas Gc in the furnace 12, and the exhaust gas Ge (also the combustion gas Gc) flowing in the exhaust gas flow path frame 5. At least one gas is sent as the mixing gas Gm. When the first end 31 a of the mixing gas line 31 is connected to the exhaust gas flow channel frame 5, the pressure of the exhaust gas Ge flowing into the mixing gas line 31 from within the exhaust gas flow channel frame 5 is increased. A blower 34 is provided in the mixing gas line 31. The flow controller 32 has a flow control valve 33 provided for each of the plurality of mixing gas nozzles 40. The flow control valve 33 is provided in the mixing gas line 31.

The installation height H of the plurality of mixing gas nozzles 40 from the upper surface of the stoker 11 is below the secondary combustion air nozzle 29 and is not less than 1500 mm and not more than 4000 mm from the upper surface of the stoker 11. The installation height H of the plurality of mixing gas nozzles 40 is preferably 2,000 mm or more and 3500 mm or less from the upper surface of the stoker 11. Each of the plurality of mixing gas nozzles 40 is provided in the combustion gas channel frame 16 so as to be able to head toward the top Ft of the flame F formed by the combustion of the incineration material M on the stoker 11. Specifically, the mixing gas nozzle 40 has a direction in which the main ejection direction Dm of the mixing gas Gm from the mixing gas nozzle 40 has a downward component and a horizontal direction Dh component approaching the flow channel axis Ap, or The combustion gas flow channel frame 16 is provided in the horizontal direction Dh approaching the flow channel axis Ap. Here, the main ejection direction Dm is a direction in which the ejection flow rate of the mixing gas Gm is the largest among the directions in which the mixing gas Gm is ejected from the mixing gas nozzle 40. The main ejection direction Dm is a direction having an angle α of 0 ° or more and 60 ° or less with respect to the horizontal direction Dh. The main ejection direction Dm is preferably a direction having an angle α of 30 ° to 50 ° with respect to the horizontal direction Dh. The main ejection direction Dm of the present embodiment is, for example, a direction at an angle α of 45 ° with respect to the horizontal direction Dh.

As shown in FIG. 2, each of the plurality of mixing gas nozzles 40 has a gas flow path 41 through which the mixing gas Gm flows. The gas flow path 41 extends around the nozzle axis An in the nozzle axis direction Dan along the nozzle axis An. An end of the gas flow path 41 in the nozzle axis direction Dan forms an ejection port 44 for ejecting the mixing gas Gm. The ejection port 44 is circular with the nozzle axis An as the center. In the present embodiment, the above-described main ejection direction Dm is the nozzle axis direction Dan.

内径 The inner diameter of the jet port 44 is 100 mm or more and 250 mm or less. It is preferable that the inner diameter of the ejection port 44 be 125 mm or more and 200 mm or less. The inner diameter of the ejection port 44 of the present embodiment is, for example, 190 mm.

The opening area is 7850 mm ² (= 50 mm × 50 mm × 3.14) when the inner diameter of the ejection port 44 is 100 mm, and the opening area is 49060 mm ² (≒ 125 mm × 125 mm × 3.14) when the inner diameter of the ejection port 44 is 250 mm. is there. The opening area is 12265 mm ² (２62.5 mm × 62.5 mm × 3.14) when the inner diameter of the ejection port 44 is 125 mm, and the opening area is 31400 mm ² (≒ 100 mm × 100 mm × 3.14) when the inner diameter of the ejection port 44 is 200 mm. ). The opening area is 28338 mm ² (= 95 mm × 95 mm × 3.14) when the inner diameter of the ejection port 44 is 190 mm. Therefore, the opening area of the ejection port 44 is 7850 mm ² or more and 49060 mm ² or less. The opening area of the jet port 44 is preferably 12265 mm ² or more and 31400 mm ² or less. The opening area of the ejection port 44 of the present embodiment is, for example, 28338 mm ² .

The inventor of the present application has changed the inner diameter of the ejection port 44 and, for each inner diameter, describes the relationship between the distance in the main ejection direction Dm from the nozzle and the flow rate of the mixing gas Gm in the main ejection direction Dm by CFD ( Computational Fluid Dynamics) analysis was performed. The CFD analysis was performed under the following conditions using nitrogen gas as the combustion gas Gc and air as the mixing gas Gm.

Temperature of combustion gas (nitrogen gas): 800 ° C
Combustion gas (nitrogen gas) rising speed: 3.1 m / s
Mixing gas (air) temperature: 150 ° C
Flow velocity in the main ejection direction Dm immediately after the injection of the mixing gas (air): 60 m / s

As a result of the CFD analysis, as shown in FIG. 3, when the inner diameter of the ejection port 44 is 85 mm, the flow rate of the mixing gas Gm sharply decreases at a distance of about 0.7 m from the nozzle, and At a position where the distance was less than 3 m, the flow rate of the mixing gas Gm became 0 m / s. When the inner diameter of the injection port 44 is 100 mm, the flow rate of the mixing gas Gm rapidly decreases from a distance of 0.9 m from the nozzle, and the mixing gas Gm increases at a distance of more than 4 m from the nozzle. Became 0 m / s. When the inner diameter of the ejection port 44 is 140 mm, the flow rate of the mixing gas Gm rapidly decreases when the distance from the nozzle is about 1.2 m, and when the distance from the nozzle exceeds 6 m, the mixing gas Gm is reduced. Became 0 m / s. When the inner diameter of the injection port 44 is 190 mm, the flow rate of the mixing gas Gm rapidly decreases from a distance of about 1.9 m from the nozzle, and even if the distance from the nozzle exceeds 6 m, the mixing gas Gm is The flow rate was ensured. As described above, as the inner diameter of the injection port 44 is increased, the penetration force of the mixing gas Gm with respect to the primary combustion air Ga1 and the combustion gas Gc, which are ascending airflows, increases.

幅 The width of the combustion gas flow path 17 of this embodiment (the width from the edge on the upstream side Dtu in the transport direction to the edge on the downstream side Dtd in the transport direction) is approximately 4 m. In order to mix the mixing gas Gm with the primary combustion air Ga1 and the combustion gas Gc within this width, it is necessary that the flow velocity of the mixing gas Gm in the main ejection direction Dm remains at any location. . Therefore, when the mixing gas nozzle 40 is provided on the edge of the upstream side Dtu in the conveying direction of the combustion gas flow path frame 16 forming the combustion gas flow path 17 and the main ejection direction Dm is set to the horizontal direction Dh, the mixing gas nozzle 40 The mixing gas nozzle 40 has an inner diameter of 100 mm or more such that the mixing gas Gm from the nozzle reaches the edge of the downstream side Dtd in the transport direction of the combustion gas flow path frame 16. On the other hand, under the condition that the ejection velocities of the plurality of nozzles are equal and the overall flow rate is constant, if the inner diameter of the mixing gas nozzle 40 is too large, the flow rate per nozzle increases, and the number of nozzles decreases, and the number of nozzles decreases. The installation interval increases. For this reason, there is a concern that the primary combustion air Ga1 and the combustion gas Gc may pass between the nozzles. For example, when the installation interval for each nozzle is 400 mm under the condition of a nozzle diameter of 85 mm, when the nozzle diameter is 250 mm, the installation interval for each nozzle is expanded to about 4000 mm. In order to prevent the combustion gas from passing between the nozzles, it is necessary to set the interval between the nozzles within 4000 mm. Therefore, in the present embodiment, the inner diameter of the mixing gas nozzle 40 is set to 250 mm or less.

In the CFD analysis described above, the flow velocity in the main ejection direction Dm immediately after the injection of the mixing gas (air) is set to 60 m / s. However, this flow rate may be 20 m / s or more and 90 m / s. It is known that the larger the nozzle diameter, the smaller the decrease in flow velocity after ejection from the nozzle, and the ratio of the decrease in flow velocity at the ejection distance is almost inversely proportional to the nozzle diameter. In the present embodiment, since it is assumed that the nozzle diameter is increased up to about three times the conventional nozzle diameter (for example, 85 mm), even if the jet flow velocity of the mixing gas Gm is reduced to about 20 m / s. Mixing can be ensured. On the other hand, when the jet flow velocity is increased, the penetration force and mixing property of the mixing gas Gm are increased, but the nozzle pressure loss is increased and the capacity of the fan must be increased. Since the nozzle pressure loss is proportional to the square of the jet flow velocity, the flow velocity is preferably set to 90 m / s or less in order to keep the fan capacity about twice as large as that of the conventional one.

That is, the jetting conditions of the mixing gas in the present embodiment are as follows.
The inner diameter of the jetting port 44: 100 mm or more 250mm or less (the opening area of the ejection port 44: 7850mm ² 49060mm ² or less or more)
Flow velocity in the main ejection direction Dm immediately after injection of the mixing gas:
20m / s or more and 90m / s

Here, in the present embodiment, a case where the total flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 is kept constant even when the inner diameter of the ejection port 44 is changed will be described. For example, the jet flow rate of the mixing gas Gm is different between when the inner diameter of the jet port 44 outside the target range of the present embodiment is 85 mm and when the inner diameter of the jet port 44 is 190 mm within the target range of the present embodiment. When the total flow rate is the same, the number of mixing gas nozzles having an inner diameter of the ejection port 44 of 190 mm is smaller than the number of mixing gas nozzles having an inner diameter of the injection port 44 of 85 mm. For this reason, the flow rate of the mixing gas Gm ejected from one mixing gas nozzle having an inner diameter of the ejection port 44 of 190 mm is equal to the flow rate of the mixing gas Gm ejected from the single mixing gas nozzle having an inner diameter of the ejection port 85 of 85 mm. More than the flow rate. Specifically, the flow rate of the mixing gas Gm ejected from one mixing gas nozzle having an inner diameter of the ejection port 44 of 190 mm is determined by the mixing gas ejected from the single mixing gas nozzle having an inner diameter of the ejection port 44 of 85 mm. It is about 5 times the flow rate of Gm. Therefore, the mixing gas Gm ejected from the mixing gas nozzle having the inner diameter of the ejection port 44 of 190 mm is higher in the primary combustion gas than the mixing gas Gm ejected from the mixing gas nozzle of the ejection port 44 having the inner diameter of 85 mm. The penetration force of the mixing gas Gm with respect to the air Ga1 and the combustion gas Gc increases.

物 The incineration material M is supplied from the hopper 10 onto the stoker 11 in the furnace 12. The incinerated material M may contain moisture. The incinerated material M is dried by the primary combustion air Ga1 at a portion on the stoker 11 on the upstream side Dtu in the transport direction. When the incinerated material M is dried to some extent, the incinerated material M is ignited, and a flame F is formed. Combustion gas Gc is generated by the combustion of the incineration material M. The combustion gas Gc flows upward in the combustion gas flow path 17 and flows into the exhaust heat recovery boiler 2. In the exhaust heat recovery boiler 2, water is exchanged with the combustion gas Gc to heat the water and generate steam. The combustion gas Gc that has passed through the exhaust heat recovery boiler 2 passes through the cooling tower 3. The temperature of the combustion gas Gc is reduced in the process of passing through the cooling tower 3. The combustion gas Gc that has passed through the cooling tower 3 passes through a combustion gas processor 4. In the process of passing through the combustion gas processor 4, the combustion gas Gc is subjected to a dust removal process and / or a denitration process to be purified. The combustion gas Gc that has passed through the combustion gas processor 4 is exhausted from the chimney 6 to the outside through the exhaust gas flow frame 5 as exhaust gas Ge.

領域 The area where the flame F is formed is most preferably an area including the position where the flow axis Ap in the transport direction Dt exists, from the viewpoint of increasing the combustion efficiency of the incineration material M. However, when a large amount of moisture is contained in the incinerated material M, it takes time to dry the incinerated material M, and the flame F has a flow axis Ap as shown by a two-dot chain line in FIG. Is formed on the downstream side in the transport direction Dtd from the position where the rotation is performed. When the flame F is formed on the downstream side Dtd in the transport direction, the distance from the incinerated material M immediately after being placed on the stoker 11 to the flame F which is a heat source for heating the incinerated material M becomes longer. For this reason, it takes more time to dry the incinerated material M, and the flame F is formed on the downstream side Dtd in the transport direction.

In the present embodiment, when the flame F is formed in the most preferable region, the mixing gas Gm from most of the mixing gas nozzles 40 among the plurality of mixing gas nozzles 40 is supplied to the top Ft of the flame F. You. Further, in the present embodiment, when the flame F is not formed in the most preferable region, for example, even when the flame F is formed on the downstream side Dtd in the transport direction from the position where the flow path axis Ap exists, the circumferential direction is not changed. Among the plurality of mixing gas nozzles 40 arranged in Dc, the mixing gas Gm from some of the mixing gas nozzles 40 is supplied to the top Ft of the flame F.

燃 焼 The combustion gas Gc immediately after generation contains unburned components. In the present embodiment, the mixing gas Gm containing oxygen is supplied to the top Ft of the flame F from at least a part of the mixing gas nozzles 40 among the plurality of mixing gas nozzles 40 as described above. That is, in the present embodiment, the mixing gas Gm containing oxygen is supplied to the combustion gas Gc immediately after generation. Therefore, in the present embodiment, the unburned portion in the combustion gas Gc can be burned with oxygen contained in the mixing gas Gm immediately after the generation of the combustion gas Gc. Therefore, in the present embodiment, at least a part of the unburned portion in the combustion gas Gc is burned immediately after the generation of the combustion gas Gc.

(4) The inventor performed a CFD analysis on the dispersion of the oxygen concentration at each height from the top surface of the stoker 11 for each of the inner diameters by changing the inner diameter of the ejection port 44.

The variance (σ2) of the oxygen concentration is based on the following definition.
σ2 = (xi−μ) 2) / n
xi: oxygen concentration in each cell when the combustion gas flow path is divided into a plurality of cells μ: average oxygen concentration in the cross section of the combustion gas flow path n: number of cells

As shown in FIG. 4, even when the inner diameter of the ejection port 44 of the nozzle is 85 mm or 195 mm, as the height from the upper surface of the stoker 11 decreases, the oxygen concentration increases. Variance increases. Specifically, when the inner diameter of the ejection port 44 is 85 mm, at a position at a height of 6 m from the upper surface of the stoker 11, the dispersion of the oxygen concentration is about 0.004, and at a position at a height of 1 m from the upper surface of the stoker 11. In this case, the dispersion of the oxygen concentration becomes larger than 0.008. Further, when the inner diameter of the ejection port 44 is 190 mm, at a position at a distance of 6 m from the upper surface of the stoker 11, the dispersion of the oxygen concentration is smaller than 0.002, and the height from the upper surface of the stoker 11 is 1 m. Even at the position, the dispersion of the oxygen concentration falls below 0.004.

According to the above CFD analysis, the larger the inner diameter of the ejection port 44, the smaller the dispersion of the oxygen concentration can be over a wide range in the vertical direction Dv. That is, by increasing the inner diameter of the ejection port 44, a high oxygen concentration can be maintained over a wide range in the vertical direction Dv. Therefore, by increasing the inner diameter of the injection port 44, the mixing ratio of the combustion gas Gc and the mixing gas Gm can be increased, and the unburned portion in the combustion gas Gc can be reduced. In the present embodiment, the inner diameter of the mixing gas nozzle 40 is set to 100 mm or more based on not only the viewpoint of the penetration force but also the viewpoint of the dispersion.

The inventor further changes the inner diameter of the injection port 44 to determine, for each inner diameter, the CO concentration, which is the unburned portion contained in the combustion gas Gc, and the height from the lower end of the combustion gas flow path frame 16. CFD analysis was performed on the relationship. This CFD analysis was performed under the following conditions using nitrogen gas as the combustion gas Gc and air as the mixing gas Gm, similarly to the above-mentioned CFD analysis.

Temperature of combustion gas (nitrogen gas): 800 ° C
Combustion gas (nitrogen gas) rising speed: 3.1 m / s
Mixing gas (air) temperature: 150 ° C
Flow velocity in the main ejection direction Dm immediately after the injection of the mixing gas (air): 60 m / s
When the inner diameter of the ejection port is 85 mm → Nozzle pitch: 0.4 m,
Number of nozzles: 20 front side + 20 rear side In the case of the inner diameter of the ejection port is 100 mm → nozzle pitch: 0.6 m,
Number of nozzles: 14 front side + 14 rear side In case of 190 mm inner diameter of nozzle → nozzle pitch: 2.0 m
Number of nozzles: 4 front side + 4 rear side * Total flow of mixing gas (air) is constant

(5) As shown in FIG. 5, the front and rear width of the combustion gas channel frame 16 was 4 m, the horizontal width of the combustion gas channel frame 16 was 8.2 m, and the height of the combustion gas channel frame 16 was 14 m.

As a result of the CFD analysis, as shown in FIG. 6, as the height from the lower end of the combustion gas flow path frame 16 becomes higher in the combustion gas flow path frame 16 regardless of the inner diameter of the injection port 44, The CO concentration gradually decreased. In the case where the inner diameter of the injection port 44 is 190 mm, when the height from the lower end of the combustion gas flow path frame 16 becomes about 5 m or more, the CO concentration becomes almost 0 [vol ppm-dry]. Further, when the inner diameter of the injection port 44 was 100 mm, when the height from the lower end of the combustion gas channel frame 16 became approximately 10 m or more, the CO concentration became approximately 0 [vol ppm-dry]. On the other hand, when the inner diameter of the injection port 44 was 85 mm, even when the height from the lower end of the combustion gas flow path frame 16 became approximately 14 m or more, the CO concentration did not become close to 0 [vol ppm-dry].

Based on the results of the CFD analysis, the relationship between the jet flow coverage and the CO concentration at the outlet of the combustion gas channel frame 16 was examined. Here, the outlet of the combustion gas flow channel frame 16 was located at the upper end of the combustion gas flow channel frame 16. The position of this upper end is a position 14 m from the lower end of the combustion gas flow path frame 16. The jet flow coverage is the ratio of the jet penetration distance to the front-rear width of the combustion gas flow channel frame 16 as shown in the following equation. The penetration distance of the jet is a distance from the nozzle to a position where the flow velocity of the mixing gas Gm becomes 0 m / s.
Jet coverage = jet penetration distance / front and back width of combustion gas flow channel frame x 100 [%]

The width of the front and rear of the combustion gas channel frame 16 is 4 m as described above. When the inner diameter of the jet outlet 44 is 85 mm, as described above with reference to FIG. 3, the penetration distance of the jet is about 3 m. When the inner diameter of the jet outlet 44 is 100 mm, the penetration distance of the jet is about 4 m. When the inner diameter of the jet port 44 is 190 mm, the jet penetration distance is 6 m or more. For this reason, here, when the inner diameter of the jet outlet 44 is 100 mm, the jet flow coverage is about 100% (= penetration distance of jet flow (4 m) / width before and after the combustion gas flow path frame (4 m) × 100). .

As shown in FIG. 7, when the jet flow coverage is about 100% or more, that is, when the inner diameter of the jet port 44 is 100 mm, the CO concentration at the outlet of the combustion gas channel frame 16 is almost 0 [vol ppm-dry]. become. On the other hand, when the jet coverage is less than about 100%, the CO concentration at the outlet of the combustion gas flow channel frame 16 does not become 0 [vol ppm-dry].

Therefore, as a result of the CFD analysis, it was found that when the inner diameter of the injection port 44 was set to 100 mm or more, the CO concentration at the outlet of the combustion gas flow path frame 16 could be made almost 0 [vol ppm-dry].

(4) After the mixing gas Gm is supplied to the combustion gas Gc, the secondary combustion air Ga2 is supplied in a process of ascending in the combustion gas passage 17. For this reason, even if the unburned portion (for example, CO) remains in the combustion gas Gc after the supply of the mixing gas Gm, the unburned portion can be burned with the secondary combustion air Ga2.

As described above, in the present embodiment, the region in which the oxygen supplied to the combustion gas Gc is present becomes longer in the vertical direction Dv, and the unburned components can be efficiently burned. For this reason, in this embodiment, the combustion efficiency of the incinerated material M can be increased.

By the way, when the mixing gas Gm is ejected from the mixing gas nozzle 40, the static pressure around the mixing gas Gm decreases, so that the top Ft of the flame F is drawn near the ejected mixing gas Gm. Can be For this reason, in this embodiment, when the flame F is not formed in the most preferable area, for example, the flame F (in FIG. 1, (Indicated by a two-dot chain line), it is possible to bring the formation region of the flame F closer to the most preferable region. Therefore, in the present embodiment, from this viewpoint as well, the combustion efficiency of the incinerated material M can be increased.

In the present embodiment, as described above, the formation region of the flame F can be made closer to the most preferable region by the effect of drawing the flame F by the mixing gas Gm. For this reason, in the CFD analysis, for example, even when the jet flow velocity of the mixing gas Gm from the mixing gas nozzle 40 is 50 m / s, the mixing gas Gm and the combustion gas Gc are generated in the same manner as when the jet flow velocity is 60 m / s. It was confirmed that the mixing of satisfactorily was performed. Therefore, in the present embodiment, the formation region of the flame F can be made closer to the most preferable region by the effect of drawing the flame F by the mixing gas Gm. Therefore, the flow rate of the mixing gas Gm ejected from one mixing gas nozzle 40 can be suppressed.

The flow controller 32 of the present embodiment has a flow control valve 33 provided for each of the plurality of mixing gas nozzles 40. Here, among the plurality of mixing gas nozzles 40, the plurality of mixing gas nozzles 40 arranged on the upstream side Dtu in the transport direction from the flow path axis Ap are defined as an upstream nozzle group, and the downstream in the transport direction from the flow path axis Ap. The plurality of mixing gas nozzles 40 arranged on the side Dtd are a downstream nozzle group. In this case, instead of the flow control valve 33 for each of the plurality of mixing gas nozzles 40, the flow controller adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 constituting the upstream nozzle group collectively. And a downstream group flow control valve that collectively adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 that constitute the downstream nozzle group. Is also good. When only the total flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 is adjusted, the flow controller adjusts the mixing gas Gm instead of the flow rate control valve 33 for each of the plurality of mixing gas nozzles 40. It may have a blower provided at or near the supply source. In this case, the total flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 is adjusted by changing the rotation speed of the blower or the like.

"Second embodiment of stoker type incinerator"
Hereinafter, a second embodiment of the stoker-type incinerator according to the present disclosure will be described with reference to FIGS.

The stoker-type incinerator of the present embodiment is different from the stoker-type incinerator of the first embodiment only in the configuration of the mixing gas supply unit. Therefore, hereinafter, the mixing gas supply unit 30a of the present embodiment will be mainly described.

As shown in FIG. 8, the mixing gas supply unit 30a of the present embodiment also has a plurality of mixing gas nozzles 40 and a plurality of mixing gas nozzles 40, similarly to the mixing gas supply unit 30 of the first embodiment. A mixing gas line 31 for guiding the mixing gas Gm, and a flow controller 32 for adjusting the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40. The mixing gas supply unit 30a of the present embodiment further includes an information acquisition unit 50 that acquires flame formation region information, an angle changing mechanism 60 that changes the main ejection direction Dm of the mixing gas Gm from the mixing gas nozzle 40, An installation height changing mechanism 65 for changing the position of the mixing gas nozzle 40 in the vertical direction Dv, and a controller 70 are provided.

The flame formation region information acquired by the information acquisition unit 50 is information for grasping the formation region of the flame F formed by the combustion of the incineration material M on the stoker 11. The information acquisition unit 50 includes, for example, an infrared camera 51 that captures an image of the furnace 12 from above, or a moisture meter 52 that detects the amount of moisture contained in the incineration material M in the hopper 10. The infrared camera 51 can detect a temperature distribution in the imaging range. It can be said that the flame F is formed in a region where the temperature is high within the imaging range of the infrared camera 51. Therefore, the data obtained by the infrared camera 51 becomes the flame formation area information. Further, as the amount of water contained in the incinerated material M in the hopper 10 increases, the drying time of the incinerated portion becomes longer, so that the flame F moves toward the downstream side Dtd in the transport direction. Therefore, the moisture content of the incinerated material M detected by the moisture meter 52 also becomes the flame formation region information. Here, the infrared camera 51 and the moisture meter 52 are illustrated as examples of the information acquisition unit 50, but the information acquisition unit 50 may be another instrument or the like as long as it can acquire the flame formation region information.

As shown in FIG. 9, the angle changing mechanism 60 rotates the nozzle support 61 that supports the mixing gas nozzle 40, a support receiver 62 that rotatably supports the nozzle support 61, and the nozzle support 61. A rotation drive mechanism 63. The support receiver 62 rotatably supports the nozzle support 61 when the angle α of the main ejection direction Dm of the mixing gas nozzle 40 with respect to the horizontal direction Dh is at least within a range of 0 ° to 60 °. As described in the first embodiment, the mixing gas nozzle 40 is preferably arranged at a position of 1500 mm or more and 4000 mm or less from the upper surface of the stoker 11. The distance from the upper surface of the stalker 11 to the top Ft of the flame F is usually about 1.5 m to about 2 to 3 m. In this case, the vertical height from the nozzle to the top Ft of the flame F ranges from 0 m to a maximum of about 2.5 m. Therefore, when the front-rear width of the combustion gas flow path frame 16 is 4 m, by setting the nozzle angle α to the range of 0 ° to 60 ° as described above, the mixing gas Gm is transferred to the top Ft of the flame F. It becomes possible to supply.

The installation height changing mechanism 65 has a slide base 66 to which the support receiver 62 of the angle changing mechanism 60 is fixed, a moving mechanism 67 for moving the slide base 66 in the vertical direction Dv, and a seal mechanism 68. An opening 19 is formed in the combustion gas channel frame 16 so that the mixing gas Gm from the mixing gas nozzle 40 can be jetted into the combustion gas channel frame 16. The seal mechanism 68 seals a gap between the slide base 66 and the opening 19 as the slide base 66 moves in the vertical direction Dv.

The controller 70 controls the operations of the angle changing mechanism 60, the installation height changing mechanism 65, and the flow control valve 33 provided for each of the plurality of mixing gas nozzles 40. As shown in FIG. 10, the controller 70 includes a flame position estimating unit 71, a target flame position storing unit 72, a deviation amount calculating unit 73, an operation target determining unit 74, an operation amount calculating unit 75, And an output unit 76. The flame position estimation unit 71 determines the position of the formation region of the flame F in the furnace 12 based on the flame formation region information acquired by the information acquisition unit 50, that is, based on the data from the infrared camera 51 or the moisture meter 52. presume. When the data of the infrared camera 51 is used, the flame position estimating unit 71 estimates the position of the formation region of the flame F from the temperature distribution in the furnace 12 obtained from the data. When the data of the moisture meter 52 is used, the flame position estimating unit 71 uses a previously determined moisture amount-positional relationship between the amount of moisture contained in the incinerated material M in the hopper 10 and the position of the flame forming region. Then, the position of the formation region of the flame F in the furnace 12 is estimated from the moisture content actually contained in the incineration material M in the hopper 10 obtained by the moisture meter 52. In the target flame position storage section 72, the position of the most preferable flame F formation area in the furnace 12 is stored as the target flame position. The shift amount calculation unit 73 calculates the shift direction of the estimated flame position estimated by the flame position estimation unit 71 and the shift amount of the estimated flame position based on the target flame position. The operation target determining unit 74 determines which of the angle change mechanism 60, the installation height change mechanism 65, and the plurality of flow rate control valves 33 is to be operated based on the shift direction and the shift amount of the estimated flame position. decide. The operation amount calculation unit 75 obtains the operation amount of the operation target determined by the operation target determination unit 74 based on the deviation direction and the deviation amount of the estimated flame position. The operation amount output unit 76 outputs the operation amount calculated by the operation amount calculation unit 75 to the operation target determined by the operation target determination unit 74.

Next, the operation of the mixing gas supply unit 30a will be described with reference to the flowchart shown in FIG.

First, the information acquisition unit 50 acquires flame formation region information (S10: information acquisition step). Next, the controller 70 receives the flame formation area information from the information acquisition unit 50, and performs a control calculation step (FIG. 2) for controlling any one of the angle changing mechanism 60, the installation height changing mechanism 65, and the plurality of flow rate control valves 33. Execute S11).

In the control calculation step (S11), first, the flame position estimating unit 71 of the controller 70 is based on the flame forming area information acquired by the information acquiring unit 50, that is, based on the data from the infrared camera 51 or the moisture meter 52. Then, the position of the formation region of the flame F in the furnace 12 is estimated (S12: flame position estimation step). Note that the flame position estimating unit 71 may estimate the position of the formation region of the flame F in the furnace 12 based on only the data from the infrared camera 51. That is, the information acquisition unit 50 may be only the infrared camera 51. In the target flame position storage section 72, the position of the most preferable flame F formation area in the furnace 12 is stored as the target flame position. The shift amount calculation unit 73 obtains the shift direction of the estimated flame position estimated by the flame position estimation unit 71 and the shift amount of the estimated flame position based on the target flame position (S13: shift amount calculation step).

Next, the operation target determination unit 74 sets any one of the angle changing mechanism 60, the installation height changing mechanism 65, and the plurality of flow rate control valves 33 as the operation target based on the shift direction and the shift amount of the estimated flame position. (S14: operation target determination step). For example, when the estimated flame position is displaced in the front-rear direction with respect to the target flame position, the operation target determining unit 74 determines whether all of the plurality of flow control valves 33 or a part of the plurality of flow control valves 33 are present. Is the operation target. In addition, for example, when the estimated flame position is vertically displaced from the target flame position, the operation target determination unit 74 sets the angle changing mechanism 60 or the installation height changing mechanism 65 as the operation target. There is a case where the estimated flame position is shifted from the target flame position both in the front-rear direction and in the vertical direction. In such a case, the operation target determination unit 74 may set all of the angle changing mechanism 60, the installation height changing mechanism 65, and the plurality of flow rate control valves 33 as operation targets.

Next, the operation amount calculation unit 75 obtains the operation amount of the operation target determined by the operation target determination unit 74 based on the deviation direction and the deviation amount of the estimated flame position (S15: operation amount calculation step). When the operation target determination unit 74 sets the plurality of flow control valves 33 as the operation targets, the operation amount calculation unit 75 obtains the operation amounts of the plurality of flow control valves 33. The operation amount output unit 76 outputs the operation amount calculated by the operation amount calculation unit 75 to the operation target determined by the operation target determination unit 74 (S16: operation amount output step). Thus, the control calculation step (S11) is completed.

{Suppose that the operation amount calculation unit 75 outputs the operation amount to the angle changing mechanism 60. In this case, the angle changing mechanism 60 changes the main ejection direction Dm of the mixing gas nozzle 40 according to the operation amount (S17: angle changing step). Specifically, for example, when the estimated flame position is shifted upward from the target flame position, the angle α of the main ejection direction Dm of the mixing gas nozzle 40 with respect to the horizontal direction Dh is reduced. When the estimated flame position is shifted downward from the target flame position, for example, the angle α of the main ejection direction Dm of the mixing gas nozzle 40 with respect to the horizontal direction Dh is increased. If the distance from the mixing gas nozzle 40 corresponding to the flow rate control valve 33 to be operated to the estimated flame position is larger than the distance from the mixing gas nozzle 40 to the target flame position, the main ejection direction Dm of the mixing gas nozzle 40 Is made smaller with respect to the horizontal direction Dh. By the above control, the mixing gas Gm ejected from the mixing gas nozzle 40 is directed toward the top Ft of the flame F, and the effect of drawing by the mixing gas Gm is enhanced, and the formation region of the flame F is changed to the first embodiment. Than the most preferable region.

(4) Assume that the operation amount calculation unit 75 outputs the operation amount to the installation height changing mechanism 65. In this case, the installation height changing mechanism 65 changes the position of the mixing gas nozzle 40 in the vertical direction Dv according to the operation amount (S18: position changing step). Specifically, for example, when the estimated flame position is shifted upward from the target flame position, the installation position of the mixing gas nozzle 40 is increased. When the estimated flame position is shifted downward from the target flame position, for example, the installation position of the mixing gas nozzle 40 is lowered. When the distance from the mixing gas nozzle 40 corresponding to the flow rate control valve 33 to be operated to the estimated flame position is larger than the distance from the mixing gas nozzle 40 to the target flame position, the installation position of the mixing gas nozzle 40 is increased. I do. By the above control, the mixing gas Gm ejected from the mixing gas nozzle 40 is directed toward the top Ft of the flame F, and the effect of drawing by the mixing gas Gm is enhanced, and the formation region of the flame F is changed to the first embodiment. Than the most preferable region.

{Suppose that the manipulated variable calculator 75 outputs the manipulated variable to all or some of the plurality of flow control valves 33. In this case, the flow rate of the mixing gas Gm ejected from the mixing gas nozzle 40 is adjusted for each of the plurality of mixing gas nozzles 40 (S19: flow rate adjusting step). Specifically, if the distance from the mixing gas nozzle 40 corresponding to the flow control valve 33 to be operated to the estimated flame position is larger than the distance from the mixing gas nozzle 40 to the target flame position, the flow control valve 33 to be operated is set. Increases the flow rate of the mixing gas Gm ejected from the mixing gas nozzle 40. By this control, the flow velocity when the mixing gas Gm ejected from the mixing gas nozzle 40 reaches the top Ft of the flame F can be increased. For this reason, by this control, the effect of drawing by the mixing gas Gm is enhanced, and the formation region of the flame F can be made closer to the most preferable region than in the first embodiment.

In the present embodiment, as described above, the angle changing mechanism 60, the installation height changing mechanism 65, and the flow controller 32 operate based on the flame formation region information. However, at least one of the angle changing mechanism 60, the installation height changing mechanism 65, and the flow controller 32 only needs to operate based on the flame forming area information.

The flow controller 32 of this embodiment has a flow control valve 33 provided for each of the plurality of mixing gas nozzles 40, as in the first embodiment. Here, among the plurality of mixing gas nozzles 40, the plurality of mixing gas nozzles 40 arranged on the upstream side Dtu in the transport direction from the flow path axis Ap are defined as an upstream nozzle group, and the downstream in the transport direction from the flow path axis Ap. The plurality of mixing gas nozzles 40 arranged on the side Dtd are a downstream nozzle group. In this case, instead of the flow control valve 33 for each of the plurality of mixing gas nozzles 40, the flow controller adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 constituting the upstream nozzle group collectively. And a downstream group flow control valve that collectively adjusts the flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles 40 that constitute the downstream nozzle group. Is also good.

The controller 70 may be configured by a computer having a CPU, a main storage device (for example, a memory), an external storage device (for example, a hard disk drive), an input / output interface circuit, and the like. In this case, a program for realizing each function of the controller 70 described above is stored in the external storage device. Further, a target flame position is stored in the external storage device. Therefore, the target flame position storage unit 72 has an external storage device. Further, the flame position estimating unit 71, the deviation amount calculating unit 73, the operation target determining unit 74, and the operation amount calculating unit 75 include a CPU that operates according to a program and a main storage device in which the calculation process and the calculation result of the CPU are expanded And is configured. The manipulated variable output unit 76 includes a CPU that operates according to a program, a main storage device in which the calculation process and calculation results of the CPU are developed, and an input / output interface circuit.

"Modification of gas nozzle for mixing"
The jet port 44 of the mixing gas nozzle 40 of each of the above embodiments is circular as described above with reference to FIG. However, the ejection port of the mixing gas nozzle does not have to be circular as shown in the respective modified examples of FIGS.

First, a first modification of the mixing gas nozzle will be described with reference to FIG. The jet port 44a of the mixing gas nozzle 40a of this modification is rectangular. The long sides of the rectangle extend in the vertical direction Dv, and the short sides of the rectangle extend in the horizontal direction Dh. Therefore, the opening width of the jet port 44a in the vertical direction Dv is wider than the opening width in the horizontal direction Dh.

Next, a second modification of the mixing gas nozzle will be described with reference to FIG. The jet port 44b of the mixing gas nozzle 40b of the present modification is elliptical. The major axis of the ellipse extends in the vertical direction Dv, and the minor axis of the ellipse extends in the horizontal direction Dh. Therefore, like the ejection port 44a of the first modification, the ejection port 44b has a wider opening width in the vertical direction Dv than the opening width in the horizontal direction Dh.

When the opening width in the vertical direction Dv is wider than the opening width in the horizontal direction Dh as in the above first and second modifications, the combustion gas Gc, which is an updraft, is more likely to flow than when the injection port 44 is circular. The area of the mixing gas Gm to be exposed is reduced. For this reason, in the mixing gas nozzles 40a and 40b of the first and second modifications, the penetration force of the mixing gas Gm with respect to the combustion gas Gc, which is an upward airflow, is increased as compared with the mixing gas nozzle 40 of the above embodiment. Can be.

Note that the opening areas of the jet ports 44a, 44b in the mixing gas nozzles 40a, 40b of the first and second modifications may be substantially the same as the opening areas of the jet ports 44 of the mixing gas nozzle 40 of the above embodiment. preferable. That is, the opening areas of the ejection ports 44a and 44b in the mixing gas nozzles 40a and 40b of the first and second modified examples are as follows when the inner diameter of the ejection port 44 of the mixing gas nozzle 40 of the first and second embodiments is 100 mm. Opening area 49060 mm ² (≒ 125 mm × 125 mm × 3.14) when the opening area is 7850 mm ² (= 50 mm × 50 mm × 3.14) or more and the inner diameter of the jet port 44 in the mixing gas nozzle 40 of the first and second embodiments is 250 mm. The following is preferred. However, in the mixing gas nozzles 40a and 40b of the first and second modifications, as described above, the penetration force of the mixing gas Gm can be increased more than the mixing gas nozzles 40 of the first and second embodiments. Therefore, the opening area of the ejection port 44 in the mixing gas nozzles 40a and 40b of the first and second modifications may be slightly smaller than the opening area exemplified above.

Next, a third modification of the mixing gas nozzle will be described with reference to FIG. When the total flow rate of the mixing gas Gm ejected from the plurality of mixing gas nozzles is kept constant, if the opening area of the ejection port is increased, the interval between two adjacent mixing gas nozzles in the circumferential direction Dc is increased, and the mixing gas is increased. The amount of the combustion gas Gc that rises without contacting Gm increases. This modification is an example of a nozzle that can suppress an increase in the amount of the combustion gas Gc that rises without contacting the mixing gas Gm even when the opening area of the ejection port is increased.

第一 A first gas flow path 42 and a second gas flow path 43 are formed in the mixing gas nozzle 40c of this modification. The first gas flow path 42 extends in the nozzle axis direction Dan around the nozzle axis An. An end of the first gas passage 42 in the nozzle axis direction Dan forms a first ejection port 45 for ejecting the mixing gas Gm. The second gas flow path 43 forms an acute angle with respect to the nozzle axis An and extends in an axis tilt direction Ds having a horizontal direction Dh component. The angle β of the axis inclination direction Ds with respect to the nozzle axis An is, for example, 60 °. An end of the second gas flow path 43 in the axis inclination direction Ds forms a second ejection port 46 for ejecting the mixing gas Gm. The second ejection port 46 is formed at a position separated from the first ejection port 45 in the horizontal direction Dh.

で も Also in this modified example, the nozzle axis direction Dan matches the main ejection direction Dm. Therefore, the mixing gas Gm from the first gas flow path 42 is jetted in a direction including the main jetting direction Dm. On the other hand, the second gas flow path 43 extends in the axial line inclination direction Ds, and the second ejection port 46 is formed at a position separated from the first ejection port 45 in the horizontal direction Dh. The mixing gas Gm from the flow path 43 is jetted in a direction away from the position in the horizontal direction Dh in the horizontal direction Dh than the mixing gas Gm jetted from the first gas flow path 42. For this reason, in the present modification, as described above, even if the total opening area of the injection port is increased, it is possible to suppress an increase in the amount of the combustion gas Gc that rises without contacting the mixing gas Gm.

Note that the total opening area of the ejection ports in the mixing gas nozzle 40c of the present modification is preferably substantially the same as the opening area of the ejection ports of the mixing gas nozzles of the above embodiment and the first and second modifications.

`` Modification of arrangement of mixing gas nozzles ''
A modification of the arrangement of the plurality of mixing gas nozzles will be described with reference to FIG.

The mixing gas supply unit according to the present modification includes a first nozzle group 40x including a plurality of mixing gas nozzles 40 and a second nozzle group 40y including a plurality of mixing gas nozzles 40. The plurality of mixing gas nozzles 40 constituting the first nozzle group 40x are arranged in the circumferential direction Dc. The plurality of mixing gas nozzles 40 constituting the second nozzle group 40y are arranged in the circumferential direction Dc at a position above the plurality of mixing gas nozzles 40 constituting the first nozzle group 40x. Further, each of the plurality of mixing gas nozzles 40 constituting the second nozzle group 40y is any two mixing gas nozzles adjacent in the circumferential direction Dc among the plurality of mixing gas nozzles 40 constituting the first nozzle group 40x. It is located at a position between 40. That is, in the present modification, two mixing gas nozzles 40 that are adjacent in the circumferential direction Dc among all the mixing gas nozzles 40 have different positions in the vertical direction Dv.

Even if there is a combustion gas Gc that did not come into contact with the mixing gas Gm from the plurality of mixing gas nozzles 40 that make up the first nozzle group 40x, the combustion gas Gc is used to make a plurality of mixing gas that make up the second nozzle group 40y. The mixing gas GM from the gas nozzle 40 can be brought into contact. Therefore, in this modified example, even if the opening area of the ejection port is increased, the amount of the rising combustion gas Gc can be suppressed without coming into contact with the mixing gas Gm.

In the present modification, the plurality of nozzles forming the first nozzle group 40x and the plurality of nozzles forming the second nozzle group 40y are all the mixing gas nozzles 40. However, only the plurality of nozzles forming the first nozzle group 40x may be the mixing gas nozzles 40, and the plurality of nozzles forming the second nozzle group 40y may be the secondary combustion air nozzles 29.

"Other variations"
The stoker-type incinerator of the above embodiment includes an exhaust heat recovery boiler 2, a cooling tower 3, a combustion gas processor (combustion gas processing unit) 4, an exhaust gas flow path frame 5, and a chimney 6. However, the stoker-type incineration facility does not need to include any of the exhaust heat recovery boiler 2, the temperature reducing tower 3, the combustion gas processor 4, the exhaust gas flow path frame 5, and the chimney 6.

"Appendix"
The stoker-type combustion equipment according to the above-described embodiment and modified examples is grasped as follows, for example.
(1) The stoker-type combustion facility in the first embodiment includes:
A stoker 11 that conveys the incineration material M in a direction having a horizontal component, a furnace 12 that covers the stoker 11 and burns the incineration material M on the stoker 11, and is generated by the combustion of the incineration material M. A combustion gas flow path 17 for guiding the combustion gas Gc upward is formed, and a combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11, and the combustion gas flow path frame 16 on the stoker 11 A combustion air supply unit 20 that supplies combustion air Ga1 to the incineration material M, and at least one of a part of the combustion air Ga1 and a part of the combustion gas Gc is used as a mixing gas Gm. And a mixing gas supply unit 30, 30 a for feeding into the furnace 12 or into the combustion gas passage 17. The mixing gas supply units 30 and 30a have one or more nozzles 40, 40a, 40b and 40c for jetting the mixing gas Gm into the furnace 12 or into the combustion gas flow path 17. The opening area of the ejection port 44, 44a, 44b to jet the nozzle 40, 40a, 40b, the mixed gas Gm in 40c is 49060Mm ² or less 7850Mm ² or more.

In this embodiment, the mixing gas Gm ejected from the nozzles 40, 40a, 40b, 40c can reach the top Ft of the flame F or a position above the top Ft of the flame F. For this reason, in this aspect, the mixing ratio of the mixing gas Gm into the combustion gas Gc can be increased, and the combustion efficiency of the unburned portion contained in the combustion gas Gc can be increased.

(2) The stoker-type combustion facility in the second embodiment is:
In the stoker-type combustion equipment according to the first aspect, the mixing gas supply unit 30, 30a has a plurality of the nozzles 40, 40a, 40b, 40c and blows out from the plurality of nozzles 40, 40a, 40b, 40c. A flow controller 32 for controlling the flow rate of the mixing gas Gm. In this case, the flow controller 32 controls the mixing gas Gm so that the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, and 40c is not less than 20 m / s and not more than 90 m / s. Adjust the flow rate.

(3) The stoker-type combustion facility in the third embodiment is:
In the stoker-type combustion equipment according to the second aspect, the plurality of nozzles 40, 40a, 40b, and 40c are arranged in a direction having a horizontal component, and two nozzles adjacent to each other in the direction having the horizontal component. The nozzles 40, 40a, 40b, and 40c have different vertical positions.

In this embodiment, the amount of the combustion gas Gc that rises without contacting the mixing gas Gm can be suppressed from increasing.

(4) The stoker-type combustion facility in the fourth embodiment is:
In the stoker-type combustion equipment according to the second aspect or the third aspect, the mixing gas supply units 30 and 30a grasp a formation area of a flame F formed by combustion of the incineration material M on the stoker 11. And an information acquisition unit 50 for acquiring flame formation region information for performing the operation. In this case, the flow controller 32 adjusts the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c based on the flame formation region information acquired by the information acquisition unit 50. I do.

(5) A stoker-type combustion facility in another aspect is as follows.
A stoker 11 that conveys the incineration material M in a direction having a horizontal component, a furnace 12 that covers the stoker 11 and burns the incineration material M on the stoker 11, and is generated by the combustion of the incineration material M. A combustion gas flow path 17 for guiding the combustion gas Gc upward is formed, and a combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11, and the combustion gas flow path frame 16 on the stoker 11 A combustion air supply unit 20 that supplies combustion air Ga1 to the incineration material M, and at least one of a part of the combustion air Ga1 and a part of the combustion gas Gc is used as a mixing gas Gm. And a mixing gas supply unit 30, 30 a for feeding into the furnace 12 or into the combustion gas passage 17. The plurality of nozzles 40, 40a, 40b, and 40c for injecting the mixing gas Gm into the furnace 12 or into the combustion gas flow path 17 include the plurality of nozzles 40, A flow controller 32 for controlling the flow rate of the mixing gas Gm ejected from the fuel tanks 40a, 40b, and 40c, and a region for forming a flame F formed by the combustion of the incineration material M on the stoker 11. An information acquisition unit 50 that acquires flame formation region information. The plurality of nozzles 40, 40a, 40b, 40c are arranged in a direction having a horizontal component. The flow rate controller 32 adjusts the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c based on the flame formation region information acquired by the information acquisition unit 50.

領域 The formation region of the flame F changes according to the amount of water in the incineration material M. Further, when the mixing gas Gm is ejected from the mixing gas nozzles 40, 40a, 40b, and 40c, the static pressure around the mixing gas Gm decreases, so that the flame F emits the mixed gas Gm. I'm drawn to the side. Therefore, when the flow rate of the mixing gas Gm ejected from the nozzles 40, 40a, 40b, and 40c is increased to increase the flow rate of the mixing gas Gm, the effect of drawing the flame F by the mixing gas Gm can be enhanced. it can. Therefore, in the present mode having the information acquisition unit 50, even when the flame F is not formed in the most preferable region, the formation region of the flame F can be made closer to the most preferable region.

(6) The stoker-type combustion facility in the fifth aspect is:
In the stoker-type combustion equipment according to any one of the first to fourth aspects and the other aspects, the nozzles 40, 40a, 40b, and 40c may be configured such that the mixing gas Gm is supplied to the stoker 11 on the stoker 11. It is provided so as to be able to go to the top Ft of the flame F formed by the combustion of the incineration material M.

(7) A stoker-type combustion facility according to still another aspect includes:
A stoker 11 that conveys the incineration material M in a direction having a horizontal component, a furnace 12 that covers the stoker 11 and burns the incineration material M on the stoker 11, and is generated by the combustion of the incineration material M. A combustion gas flow path 17 for guiding the combustion gas Gc upward is formed, and a combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11, and the combustion gas flow path frame 16 on the stoker 11 A combustion air supply unit 20 that supplies combustion air Ga1 to the incineration material M, and at least one of a part of the combustion air Ga1 and a part of the combustion gas Gc is used as a mixing gas Gm. And a mixing gas supply unit 30, 30 a for feeding into the furnace 12 or into the combustion gas passage 17. The mixing gas supply units 30 and 30a have nozzles 40, 40a, 40b and 40c for injecting the mixing gas Gm into the furnace 12 or into the combustion gas passage 17, respectively. The nozzles 40, 40a, 40b, and 40c are provided so that the mixing gas Gm can travel toward the top Ft of the flame F formed by the combustion of the incineration material M on the stoker 11.

燃 焼 The combustion gas Gc immediately after generation contains unburned components. In this embodiment, the mixing gas Gm from the mixing gas nozzles 40, 40a, 40b, and 40c can be supplied to the top Ft of the flame F in the present embodiment in which the mixing gas Gm is directed to the top Ft of the flame F. That is, in this embodiment, the mixing gas Gm containing oxygen is supplied to the combustion gas Gc immediately after generation. For this reason, in this aspect, the unburned portion in the combustion gas Gc can be burned with oxygen contained in the mixing gas Gm immediately after the generation of the combustion gas Gc. Moreover, in this embodiment, the mixed gas containing oxygen can be supplied over a wide range in the vertical direction. Therefore, in this embodiment, at least a part of the unburned portion in the combustion gas Gc is burned immediately after the generation of the combustion gas Gc.

(8) The stoker-type combustion facility in the sixth aspect is:
In the stoker-type combustion facility according to any one of the first aspect to the fifth aspect, the other aspect, and the still other aspect, the main part of the mixing gas Gm from the nozzles 40, 40a, 40b, and 40c is provided. The direction of ejection Dm has a downward component and a horizontal component passing through the center in the horizontal cross section of the combustion gas flow path 17 and approaching a flow axis Ap extending vertically, or approaching the flow axis Ap. The nozzles 40, 40a, 40b, 40c are provided so as to be horizontal.

(9) The stoker-type combustion facility in the seventh aspect is:
In the stoker-type combustion equipment according to the sixth aspect, the main ejection direction Dm is a direction having an angle of 0 ° or more and 60 ° or less with respect to a horizontal direction.

(10) The stoker-type combustion facility according to the eighth aspect includes:
In the stoker-type combustion equipment according to any one of the first embodiment to the seventh embodiment, the other embodiment, and the still other embodiment, the nozzles 40, 40a, 40b, and 40c are connected to the combustion gas passage frame 16 It is provided in.

In this embodiment, the distance from the nozzles 40, 40a, 40b, 40c to the flame F can be shorter than when the furnace 12 is provided with the nozzles 40, 40a, 40b, 40c. For this reason, in this embodiment, the flow velocity of the mixing gas Gm when the mixing gas Gm reaches the flame F can be higher than in the case where the furnace 40 is provided with the nozzles 40, 40a, 40b, and 40c. . Therefore, in this embodiment, the mixing ratio of the mixing gas Gm into the combustion gas Gc can be increased, and the effect of attracting the flame F can be enhanced by the mixing gas Gm.

(11) The stoker-type combustion facility in the ninth aspect includes:
In the stoker type combustion equipment according to any one of the first to eighth aspects, the other aspects, and the still other aspects, the combustion for treating the combustion gas Gc flowing through the combustion gas flow path 17 is performed. A gas processing unit 4 is provided. The combustion gas Gc that can be included in the mixing gas Gm includes an exhaust gas that is the combustion gas Gc processed by the combustion gas processing unit 4.

(12) The stoker-type combustion facility in the tenth aspect includes:
In the stoker-type combustion equipment according to any one of the first embodiment to the ninth embodiment, the other embodiment, and the still another embodiment, the nozzles 40, 40a, 40b, and 40c are 1500 mm from the upper surface of the stoker 11. Thus, it is installed at a position of 4000 mm or less.

(13) The stoker-type combustion facility according to the eleventh aspect,
In the stoker type combustion equipment according to any one of the first aspect to the tenth aspect, the other aspect, and the still other aspect, the mixing gas supply units 30 and 30a may include the nozzles 40, 40a and 40b. , 40c has an angle changing mechanism 60 for changing the main jet direction Dm of the mixing gas Gm.

領域 The formation region of the flame F changes according to the amount of water in the incineration material M. In this embodiment, even if the formation region of the flame F changes, the mixing gas Gm from the nozzles 40, 40a, 40b, and 40c can be guided to the top Ft of the flame F by changing the main ejection direction Dm. Further, when the mixing gas Gm is ejected from the mixing gas nozzles 40, 40a, 40b, and 40c, the static pressure around the mixing gas Gm decreases, so that the flame F is located near the ejected mixing gas Gm. Is attracted. For this reason, in this aspect, even when the flame F is not formed in the most preferable area, the area where the flame F is formed can be made closer to the most preferable area.

(14) The stoker-type combustion facility in the twelfth aspect,
In the stoker-type combustion facility according to the eleventh aspect, the mixing gas supply units 30 and 30a are provided with a flame for grasping a formation area of a flame F formed by combustion of the incineration material M on the stoker 11. It has an information acquisition unit 50 that acquires formation area information. In this case, the angle changing mechanism 60 changes the main ejection direction Dm of the nozzles 40, 40a, 40b, 40c based on the flame forming area information acquired by the information acquiring unit 50.

(15) The stoker-type combustion facility in the thirteenth aspect,
In the stoker-type combustion equipment according to any one of the first aspect to the twelfth aspect, the other aspect, and the still other aspect, the mixing gas supply unit 30, 30a includes the nozzle 40, 40a, There is an installation height changing mechanism 65 that changes the position of the vertical direction of 40b, 40c.

領域 As described above, the formation region of the flame F changes according to the amount of water in the incineration material M. In this embodiment, even if the formation region of the flame F changes, the gas Gm for mixing from the nozzles 40, 40a, 40b, and 40c is changed by changing the positions of the nozzles 40, 40a, 40b, and 40c in the vertical direction. It can lead to the top Ft. Further, when the mixing gas Gm is ejected from the mixing gas nozzles 40, 40a, 40b, and 40c, the static pressure around the mixing gas Gm decreases, so that the flame F is located near the ejected mixing gas Gm. Is attracted. For this reason, in this aspect, even when the flame F is not formed in the most preferable area, the area where the flame F is formed can be made closer to the most preferable area.

(16) The stoker-type combustion facility in the fourteenth aspect,
In the stoker-type combustion facility according to the thirteenth aspect, the mixing gas supply units 30 and 30a are configured to detect a formation area of a flame F formed by combustion of the incinerated material M on the stoker 11. It has an information acquisition unit 50 that acquires formation area information. In this case, the installation height changing mechanism 65 changes the positions of the nozzles 40, 40a, 40b, and 40c in the vertical direction based on the flame forming area information acquired by the information acquiring unit 50.

(17) The stoker-type combustion facility according to the fifteenth aspect,
In the stoker type combustion equipment according to any one of the first aspect to the fourteenth aspect, the other aspect, and the still another aspect, the first gas flow through which the mixing gas Gm flows through the nozzle 40c A passage 42 and a second gas flow path 43 are formed, and the first gas flow path 42 extends around the nozzle axis An of the nozzle 40c in the nozzle axis direction Dan along the nozzle axis An, and the nozzle axis An end in the direction Dan forms a first ejection port 45 for ejecting the mixing gas Gm. In this case, the second gas flow path 43 forms an acute angle with respect to the nozzle axis An and extends in the axis inclination direction Ds having a horizontal component, and the end of the axis inclination direction Ds receives the mixing gas Gm. A second jet port 46 for jetting is formed. The second ejection port 46 is formed at a position horizontally separated from the first ejection port 45.

In this embodiment, the amount of the combustion gas Gc that rises without contacting the mixing gas Gm can be suppressed from increasing.

(18) The stoker-type combustion facility in the sixteenth aspect,
In the stoker-type combustion equipment according to any one of the first embodiment to the fourteenth embodiment, the other embodiment, and the still another embodiment, an ejection port 44a for ejecting the mixing gas Gm of the nozzles 40a and 40b. , 44b have a wider opening width in the vertical direction than in the horizontal direction.

(4) If the opening width in the vertical direction is wider than the opening width in the horizontal direction, the area of the mixing gas Gm exposed to the combustion gas Gc, which is an updraft, becomes smaller than when the injection port is circular. For this reason, in this aspect, the penetration force of the mixing gas Gm with respect to the combustion gas Gc, which is an upward airflow, can be increased as compared with the case where the ejection port is circular.

(19) The stoker-type combustion facility in the seventeenth aspect,
In the stoker-type combustion equipment according to any one of the first aspect to the sixteenth aspect, the other aspect, and the still other aspect, the mixing gas supply units 30 and 30a eject the mixing gas Gm. The secondary combustion air supply unit 25 that supplies the secondary combustion air Ga2 into the combustion gas flow path 17 from a position higher than the position where the secondary combustion air flows.

In this embodiment, after the mixing gas Gm is supplied, the secondary combustion air Ga2 is supplied in a process of ascending in the combustion gas flow path 17. For this reason, even if the unburned portion remains in the combustion gas Gc after the supply of the mixing gas Gm, the unburned portion can be burned with the secondary combustion air Ga2.

方法 In addition, the incineration method of the incineration material M in the above-described embodiment and the modified example is grasped as follows, for example.

(20) The incineration method of the incinerated material M in the eighteenth aspect is as follows:
The following is a method for incinerating the incinerated material M in the stoker type combustion facility.
The stoker-type combustion equipment includes a stoker 11 that conveys the incineration object M in a direction having a horizontal component, a furnace 12 that covers the stoker 11 and burns the incineration object M on the stoker 11; A combustion gas flow path 17 for guiding a combustion gas Gc generated by combustion of the object M upward is formed, and a combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11. And a combustion air supply unit 20 for supplying combustion air Ga1 to the incinerated material M on the stoker 11.
The incineration method of the incineration material M in the stoker-type combustion facility includes a method in which at least one of a part of the combustion air Ga1 and a part of the combustion gas Gc is used as the mixing gas Gm, and the nozzles 40 A mixing gas supply step is performed from 40 a, 40 b, 40 c to the inside of the furnace 12 or into the combustion gas passage 17. The opening area of the ejection port 44, 44a, 44b for ejecting a plurality of the nozzles 40, 40a, 40b, the mixed gas Gm in 40c is 49060Mm ² or less 7850Mm ² or more. The mixing gas supply step is performed so that the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, and 40c is not less than 20 m / s and not more than 90 m / s. Adjusting the flow rate.

(21) The incineration method of the incinerated material M in the nineteenth aspect is as follows:
In the incineration method of the incinerated material M according to the eighteenth aspect, the mixing gas supply step includes a flame for grasping a formation region of a flame F formed by burning the incinerated material M on the stoker 11. An information acquisition step of acquiring formation area information is included. In this case, in the flow rate adjusting step, the flow rate of the mixing gas Gm ejected from the plurality of nozzles 40, 40a, 40b, 40c is adjusted based on the flame formation region information.

(22) The incineration method of the incinerated material M in another aspect includes:
The following is a method for incinerating the incinerated material M in the stoker type combustion facility.
The stoker-type combustion equipment includes a stoker 11 that conveys the incineration object M in a direction having a horizontal component, a furnace 12 that covers the stoker 11 and burns the incineration object M on the stoker 11; A combustion gas flow path 17 for guiding a combustion gas Gc generated by combustion of the object M upward is formed, and a combustion gas flow path frame 16 connected to the furnace 12 so as to be located above a part of the stoker 11. And a combustion air supply unit 20 for supplying combustion air Ga1 to the incinerated material M on the stoker 11.
The incineration method of the incineration material M in the stoker-type combustion facility is characterized in that at least one of a part of the combustion air Ga1 and a part of the combustion gas Gc is used as the mixing gas Gm in the furnace 12 or A mixing gas supply step to be sent into the combustion gas passage 17 is executed. In the mixing gas supply step, the mixing gas Gm flows into the combustion gas flow path 17 so as to travel toward the top Ft of the flame F formed by the combustion of the incineration material M on the stoker 11. The gas Gm.

(23) The incineration method of the incinerated material M in the twentieth aspect is as follows:
In the incineration method of the incinerated material M according to the eighteenth aspect or the other aspect, the mixing gas supply step includes forming a region of the flame F formed on the stoker 11 by burning the incinerated material M. An information acquiring step of acquiring flame forming area information for grasping, and an angle changing step of changing a main ejection direction Dm of the mixing gas Gm based on the flame forming area information are included.

(24) The incineration method of the incinerated material M in the twenty-first aspect includes:
In the incineration method of the incinerated material M according to the eighteenth aspect or the other aspect, the mixing gas supply step includes forming a region of the flame F formed on the stoker 11 by burning the incinerated material M. An information obtaining step of obtaining flame forming area information for grasping, and a position changing step of changing a vertical position at which the mixing gas Gm is ejected based on the flame forming area information are included.

According to one embodiment of the present disclosure, it is possible to increase the combustion efficiency of the incinerated material.

1: stoker-type incinerator 2: exhaust heat recovery boiler 3: cooling tower 4: combustion gas processor (combustion gas processing unit)
5: Exhaust gas channel frame 6: Chimney 10: Hopper 11: Stalker 12: Furnace 13: Primary combustion chamber 14: Inlet 15: Outlet 16: Combustion gas channel frame 17: Combustion gas channel 18: Secondary combustion Chamber 19: Opening 20: Primary combustion air supply 21: Air supply 22: Wind box 25: Secondary combustion air supply 26: Secondary combustion air line 27: Flow controller 28: Flow control valve 29: Secondary combustion air nozzles 30, 30a: mixing gas supply unit 31: mixing gas line 32: flow controller 33: flow control valve 34: blowers 40, 40a, 40b, 40c: mixing gas nozzle (or simply nozzle) )
40x: first nozzle group 40y: second nozzle group 41: gas flow path 42: first gas flow path 43: second gas flow paths 44, 44a, 44b: ejection port 45: first ejection port 46: second ejection Exit 50: Information acquisition unit 51: Infrared camera 52: Moisture meter 60: Angle changing mechanism 61: Nozzle support 62: Support receiver 63: Rotating drive mechanism 65: Installation height changing mechanism 66: Slide base 67: Moving mechanism 68 : Sealing mechanism 70: Controller 71: Flame position estimating unit 72: Target flame position storage unit 73: Deviation amount calculating unit 74: Operation target determining unit 75: Operation amount calculating unit 76: Operation amount output unit Ga 1: Air for primary combustion Ga2: Secondary combustion air Gm: Mixing gas Gc: Combustion gas Ge: Exhaust gas F: Flame Ft: Top M: Incineration object Ap: Channel axis An: Nozzle axis Dt: Transport direction Dtu: Upstream in the transport direction Dtd: How to transport Downstream Dc: circumferential direction Dv: vertical Dh: horizontal Dan: nozzle axis direction Dm: main injection direction Ds: axial inclination direction H: installation height

Claims (21)

A stoker for conveying the incinerated material in a direction having a horizontal component,
A furnace that covers the stoker and incinerates the incinerator on the stoker;
A combustion gas flow path is formed, which is provided with a combustion gas flow path that guides a combustion gas generated by combustion of the incinerated material upward, and is connected to the furnace so as to be located above a part of the stoker,
A combustion air supply unit for supplying combustion air to the incinerated material on the stoker,
A part of the combustion air and a part of the combustion gas, a mixing gas supply unit that sends at least one gas as a mixing gas into the furnace or into the combustion gas flow path,
The mixing gas supply unit has one or more nozzles that ejects the mixing gas into the furnace or into the combustion gas flow path,
The opening area of the ejection port for ejecting said mixed gas in said nozzle is 49060Mm ² or less 7850Mm ² or more,
Stoker type incineration equipment. The stoker-type incineration plant according to claim 1,
The mixing gas supply unit has a plurality of the nozzles, and has a flow controller that adjusts a flow rate of the mixing gas ejected from the plurality of nozzles,
The flow rate controller adjusts a flow rate of the mixing gas such that a flow rate of the mixing gas ejected from the plurality of nozzles is equal to or greater than 20 m / s and equal to or less than 90 m / s.
Stoker type incineration equipment. The stoker-type incineration plant according to claim 2,
The plurality of nozzles are arranged in a direction having a horizontal component,
The two nozzles adjacent in the direction having the horizontal component have different vertical positions,
Stoker type incineration equipment. The stoker-type incinerator according to claim 2 or 3,
The mixing gas supply unit has an information acquisition unit that acquires flame formation region information for grasping a formation region of a flame formed by combustion of the incinerated material on the stoker,
The stoker type incinerator, wherein the flow rate controller adjusts a flow rate of the mixing gas ejected from the plurality of nozzles based on the flame formation region information acquired by the information acquisition unit. The stoker-type incinerator according to any one of claims 1 to 4,
The nozzle is provided so that the mixing gas can be directed to a top of a flame formed by combustion of the incineration object on the stoker,
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 5,
A direction in which the main jet direction of the mixing gas from the nozzle has a downward component and a horizontal component that passes through the center in the horizontal cross section of the combustion gas channel and approaches a channel axis that extends vertically. The nozzle is provided so as to be in a horizontal direction approaching the flow channel axis,
Stoker type incineration equipment. The stoker-type incineration plant according to claim 6,
The main ejection direction is a direction having an angle of 0 ° or more and 60 ° or less with respect to the horizontal direction.
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 7,
The nozzle is provided in the combustion gas channel frame,
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 8,
A combustion gas processing unit that processes the combustion gas flowing through the combustion gas flow path,
The combustion gas that may be included in the mixing gas includes an exhaust gas that is the combustion gas processed in the combustion gas processing unit,
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 9,
The nozzle is installed at a position of 1500 mm or more and 4000 mm or less from the upper surface of the stoker,
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 10,
The mixing gas supply unit has an angle changing mechanism that changes a main ejection direction of the mixing gas from the nozzle,
Stoker type incineration equipment. The stoker-type incineration plant according to claim 11,
The mixing gas supply unit has an information acquisition unit that acquires flame formation region information for grasping a formation region of a flame formed by combustion of the incinerated material on the stoker,
The angle changing mechanism changes the main ejection direction of the nozzle based on the flame formation region information acquired by the information acquisition unit.
Stoker type incineration equipment. In the stoker-type incineration plant according to any one of claims 1 to 12,
The mixing gas supply unit has an installation height changing mechanism that changes the position of the nozzle in the vertical direction,
Stoker type incineration equipment. The stoker-type incineration plant according to claim 13,
The mixing gas supply unit has an information acquisition unit that acquires flame formation region information for grasping a formation region of a flame formed by combustion of the incinerated material on the stoker,
The installation height change mechanism, based on the flame formation area information acquired by the information acquisition unit, changes the position of the nozzle in the vertical direction,
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 14,
In the nozzle, a first gas flow path and a second gas flow path through which the mixing gas flows are formed,
The first gas flow path extends around the nozzle axis of the nozzle in the nozzle axis direction along the nozzle axis, and an end in the nozzle axis direction forms a first ejection port for ejecting the mixing gas. ,
The second gas flow path forms an acute angle with respect to the nozzle axis and extends in an axially inclined direction having a horizontal component, and an end in the axially inclined direction forms a second ejection port for ejecting the mixing gas. And
The second ejection port is formed at a position horizontally separated from the first ejection port.
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 14,
An ejection port for ejecting the mixing gas of the nozzle has a wider opening width in a vertical direction than an opening width in a horizontal direction,
Stoker type incineration equipment. The stoker-type incinerator according to any one of claims 1 to 16,
A secondary combustion air supply unit that supplies secondary combustion air into the combustion gas flow path from a position higher than a position where the mixing gas supply unit ejects the mixing gas,
Stoker type incineration equipment. A stoker for conveying the incinerated material in a direction having a horizontal component,
A furnace that covers the stoker and incinerates the incinerator on the stoker;
A combustion gas flow path is formed, which is provided with a combustion gas flow path that guides a combustion gas generated by combustion of the incinerated material upward, and is connected to the furnace so as to be located above a part of the stoker,
A combustion air supply unit for supplying combustion air to the incinerated material on the stoker,
In the incineration method of the incinerated material in the stoker type incineration equipment equipped with
Executing a mixing gas supply step of sending at least one gas of a part of the combustion air and a part of the combustion gas as a mixing gas from a plurality of nozzles into the furnace or into the combustion gas flow path. And
The opening area of the ejection port for ejecting said mixed gas at a plurality of said nozzles is at 49060Mm ² or less 7850Mm ² or more,
The mixing gas supply step includes a flow rate adjustment step of adjusting a flow rate of the mixing gas such that a flow rate of the mixing gas ejected from the plurality of nozzles is equal to or greater than 20 m / s and equal to or less than 90 m / s.
How to incinerate incinerated materials. The incineration method for incinerated materials according to claim 18,
The mixing gas supply step includes an information acquisition step of acquiring flame formation area information for grasping a formation area of a flame formed by combustion of the incinerated material on the stoker,
In the flow rate adjusting step, based on the flame forming area information, adjust the flow rate of the mixing gas ejected from a plurality of nozzles,
How to incinerate incinerated materials. The incineration method for incinerated materials according to claim 18,
The mixing gas supply step,
An information acquisition step of acquiring flame formation region information for grasping a formation region of a flame formed by burning the incinerated material on the stoker,
An angle changing step of changing a main ejection direction of the mixing gas based on the flame formation region information,
including,
How to incinerate incinerated materials. The incineration method for incinerated materials according to claim 18,
The mixing gas supply step,
An information acquisition step of acquiring flame formation region information for grasping a formation region of a flame formed by burning the incinerated material on the stoker,
Based on the flame formation area information, a position changing step of changing the position in the vertical direction of ejecting the mixing gas,
including,
How to incinerate incinerated materials.

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