TWI853401B - Combustion equipment and control devices - Google Patents

Abstract

A combustion device comprises: a furnace body in which a burnt material is transported while being burned, and a nozzle for supplying a part of exhaust gas discharged from the furnace body to the inside of the furnace body, wherein the nozzle is arranged at the tail of the furnace body in a direction that the exhaust gas supplied to the inside of the furnace body forms a spray flow along the wall surface of the ceiling of the furnace body.

Description

Combustion equipment and control devices

The present invention relates to a combustion device and a control device.

For example, Patent Document 1 discloses a garbage incinerator in which a secondary air supply nozzle is arranged in a position opposite to the garbage transport direction in a primary combustion chamber, and the nozzle of the secondary air supply nozzle is directed toward the top of the garbage on the fire grid to spray secondary air. The secondary air is sprayed along the top of the garbage as a free jet, thereby mixing and stirring the combustion gas at the base of the flame, thereby increasing the combustion promotion effect. In this way, the occurrence of incomplete combustion is suppressed, and the occurrence of unburned components is suppressed. On the other hand, the technology described in Patent Document 1 is to use the secondary air to push the gas in the primary combustion chamber to flow, so the gas retention time in the primary combustion chamber may be reduced.

For example, Patent Document 2 discloses a combustion operation method of a combustion furnace, wherein the exhaust gas discharged from the incinerator is supplied as a free jet from a plurality of fire grates provided at the bottom of the incinerator, a furnace ceiling wall located above a drying fire grate, and a furnace rear wall on the downstream side of the garbage supply direction in the furnace, in a manner that does not directly hit the fire grate at the bottom of the furnace and attracts the gas generated by combustion. By supplying the recirculated exhaust gas to the furnace, the entire primary combustion chamber in the furnace is utilized as a combustion space, thereby reducing nitrogen oxides at the furnace outlet. The technology described in Patent Document 2 is to set the supply angle of the recirculated exhaust gas so that the recirculated exhaust gas will not be affected by the ceiling wall and attenuated.

For example, Patent Document 3 discloses an incinerator in which, in the primary combustion chamber of the incinerator, the unburned gas generated in the combustion stage is sucked toward the rear wall side by the gas flow supplied as a free jet from the rear supply nozzle, and the unburned gas generated in the drying stage is sucked toward the front side by the gas flow supplied as a free jet from the front supply nozzle and then sent to the secondary combustion chamber. By these nozzles, it is possible to contribute to the reduction of _NOx in the hot gas flow in the same manner as in the conventional technology of supplying the recirculated exhaust gas from the ceiling wall on the front side of the primary combustion chamber.

Furthermore, for example, Patent Document 4 discloses a furnace bed furnace in which the center axis of the furnace for discharging the exhaust gas generated in the processing space (inside the furnace body) is offset and arranged at a position different from the combustion stage, and the first gas port ejects the exhaust gas as a free jet into the processing space from the side opposite to the offset direction of the furnace. As a result, a secondary flow toward the side opposite to the offset direction of the furnace is formed in the processing space, so that the flame grows in a direction away from the furnace. The heat of the flame promotes the drying of the burnt material in the drying stage or the post-combustion in the post-combustion stage, and as a result, the reduction of _NOx and unburned gas is achieved.

Moreover, for example, Patent Document 5 discloses a furnace-type combustion device, which is equipped with: a nozzle for sending at least one of a part of the combustion air and a part of the combustion gas into the furnace as a mixed gas of free jet. The nozzle is arranged to direct the mixed gas toward the top of the flame formed by the combustion of the burnt material on the furnace bed. Thereby, the mixed gas ejected from the nozzle can reach the top of the flame or a position above the top of the flame. As a result, the mixing ratio of the mixed gas to the combustion gas can be increased, and the combustion efficiency of the unburned components contained in the combustion gas can be improved. [Prior technical document] [Patent document]

[Patent Document 1] Japanese Patent No. 2662746 [Patent Document 2] Japanese Patent No. 6116545 [Patent Document 3] International Publication No. 2020/189394 [Patent Document 4] International Publication No. 2021/106645 [Patent Document 5] International Publication No. 2020/071142

[The problem the invention is trying to solve]

In the field of incineration equipment for waste incineration, there is a demand for technology that increases the residence time of exhaust gas in the furnace body.

The present invention is completed to solve the above-mentioned problem, and its purpose is to provide a combustion device and a control device that can increase the retention time of exhaust gas in the furnace body. [Technical means for solving the problem]

In order to solve the above problems, the combustion equipment of the present invention comprises: a furnace body in which the burnt material is transported while being burned, and a nozzle for supplying a part of the exhaust gas discharged from the furnace body to the inside of the furnace body, wherein the nozzle is arranged at the furnace tail of the furnace body in a direction that the exhaust gas supplied to the inside of the furnace body forms a wall spray along the ceiling of the furnace body, and the nozzle The exhaust gas is supplied from the opening of the nozzle in a cone-shaped diffusion manner, so that a part of the exhaust gas collides with the ceiling of the furnace body from the lower side to form the wall spray. The nozzles are arranged in plurality at intervals in the road width direction at the tail of the furnace to form the wall spray in which the exhaust gas supplied from each nozzle merges with each other, and the intervals between the plurality of nozzles are set.

The control device of the present invention is a control device of the combustion equipment, and the combustion equipment further comprises: a fan that supplies a part of the exhaust gas to the nozzle through an exhaust gas recirculation pipeline, and has: a detection unit that detects the CO concentration and _NOx concentration in the exhaust gas; and an adjustment unit that increases or decreases the number of revolutions of the fan when one or more of the CO concentration and the _NOx concentration in the exhaust gas increases or decreases according to the detection result of the detection unit. [Effects of the Invention]

According to the present invention, a combustion device and a control device that can increase the residence time of exhaust gas in a furnace body can be provided.

Hereinafter, the form of the combustion equipment for implementing the present invention will be described with reference to the attached drawings.

(Combustion equipment) Combustion equipment is a hearth-type incinerator that incinerates waste materials such as urban garbage, industrial waste, or biomass. For the sake of convenience, "waste materials" will be referred to as "garbage" below. Garbage is the fuel used for combustion reactions in the incinerator.

As shown in FIG1 , the combustion equipment 100 includes: a combustion furnace 1, an exhaust heat recovery boiler 12, a cooling tower 13, a dust collecting device 14, an outlet flow path 15, a chimney 16, a guide fan 17, a garbage pit 18, an ash extrusion device 19, an ash pit 20, an exhaust gas recycling system 21, an exhaust gas concentration acquisition unit 25, and a control device 30.

(Incinerator) Incinerator 1 is a furnace that burns garbage W while transporting it inside. As garbage W is burned by incinerator 1, exhaust gas is generated from incinerator 1. The generated exhaust gas is sent to the exhaust heat recovery boiler 12 connected to the upper part of incinerator 1.

The exhaust heat recovery boiler 12 generates steam by exchanging heat between the exhaust gas and water to heat the water. The generated steam is used, for example, by a steam turbine or other machine (not shown) outside the combustion equipment 100. The exhaust gas passing through the exhaust heat recovery boiler 12 is cooled in a cooling tower 13 and then sent to a dust collector 14. The exhaust gas after the coal ash or dust is removed in the dust collector 14 is discharged to the atmosphere through an outlet flow path 15 and a chimney 16.

Here, an induced draft fan 17 (IDF) is disposed in the middle of the outlet flow path 15, and can guide the exhaust gas generated in the combustion furnace 1 toward the chimney 16. The induced draft fan 17 guides the exhaust gas from the combustion furnace 1, thereby maintaining the inside of the combustion furnace 1 in a negative pressure state.

The combustion furnace 1 comprises a furnace body 2, a fuel supply mechanism 3, a furnace bed 4, a wind box 5, a discharge passage 6, a furnace 7, an air blower 8, a primary air line 9, an air preheater 10, and a secondary air line 11.

(Furnace body) The furnace body 2 is composed of a plurality of walls. Inside the furnace body 2, there is a processing space V for transporting the garbage W while burning. In the processing space V, the garbage W is transported in the transport direction Da (left and right directions in Figures 1 and 2) while burning. The garbage W incinerated in the processing space V is discharged to the outside of the furnace body 2 through the discharge channel 6.

In the following, for the sake of convenience, the side of the transport direction Da from the discharge passage 6 toward the fuel supply mechanism 3 (the left side in Figures 1 and 2) is called "one side Dal". And, the side opposite to the one side Dal where the garbage W is transported (the right side in Figures 1 and 2) is called "the other side Dar". The structure of the furnace body 2 will be described later.

(Fuel supply mechanism) The fuel supply mechanism 3 is a mechanism that receives garbage W from the outside of the combustion furnace 1 and supplies the received garbage W to the processing space V inside the furnace body 2. The fuel supply mechanism 3 of this embodiment has a hopper 300 and a feeder 310.

The hopper 300 is an inlet of the combustion furnace 1 for supplying garbage W to the interior of the furnace body 2. The garbage W is thrown into the hopper 300 from the outside of the combustion furnace 1 by the crane 182. The hopper 300 has an inlet 301 and an outlet 302.

The inlet 301 is the inlet portion of the hopper 300 for putting garbage W from the outside. The inlet 301 guides the garbage W supplied from the upper side in the vertical direction Dv (the vertical direction in Figures 1 and 2) which is perpendicular to the horizontal plane to the outlet 302 on the lower side. The inlet 301 is in the shape of a cylinder extending in the vertical direction Dv. The outlet 302 is connected to the lower part of the inlet 301. Therefore, the garbage W put into the inlet 301 will fall to the lower side due to gravity.

In the following, for convenience of explanation, the upper side in the vertical direction Dv (the upper side in FIGS. 1 and 2 ) is abbreviated as “upper side Dvu”, and the side opposite to the upper side Dvu (the lower side in FIGS. 1 and 2 ) is abbreviated as “lower side Dvd”.

The outlet portion 302 is an outlet part of the hopper 300 for guiding the garbage W introduced into the inlet portion 301 to the processing space V inside the furnace body 2. The outlet portion 302 has a storage space R formed inside for temporarily storing the garbage W before the garbage W is supplied to the processing space V inside the furnace body 2. The outlet portion 302 of this embodiment is in a box shape extending in the conveying direction Da.

The feeder 310 is a device for supplying the garbage W in the hopper 300 to the processing space V inside the furnace body 2. The feeder 310 is configured to be reciprocatingly movable in the conveying direction Da with respect to the floor 302a facing the upper side Dvu of the inner surface of the outlet 302.

The end of one side Dal of the feeder 310 is connected to a feeder drive mechanism (not shown) that reciprocates the feeder 310 by means of hydraulic pressure or the like. The feeder 310 can reciprocate in the transport direction Da within the storage space R by means of the feeder drive mechanism. In other words, the feeder 310 can move forward and backward from one side Dal toward the other side Dar on the floor 302a of the exit portion 302.

The feeder 310 is in the shape of a plate having a predetermined thickness and extending in the conveying direction Da and the furnace width direction. The feeder 310 has an upper surface 311 facing the upper side Dvu and an extrusion surface 312 connected to the upper surface 311 and facing the other side Dar. In the following, for the sake of convenience, the width direction of the furnace body 2 which is perpendicular to the conveying direction Da and the vertical direction Dv is referred to as the "furnace width direction Dw".

The upper surface 311 is a surface on which the garbage W supplied from the inlet 301 is accumulated. The extrusion surface 312 is a surface for extruding the garbage W accumulated on the ground 302a to the other side Dar. That is, the feeder 310 is moved back and forth in the conveying direction Da at a predetermined timing, thereby intermittently extruding the garbage W in the storage space R toward the processing space V.

That is, the garbage W on the upper surface 311 of the feeder 310 and the garbage W on the floor 302a of the outlet 302 are integrated in the storage space R. Therefore, the extrusion surface 312 of the feeder 310 squeezes the garbage W toward the processing space V, thereby the garbage W accumulated on the upper surface 311 is also linked and moved toward the processing space V.

(Furnace bed) The furnace bed 4 is composed of a plurality of fire grids (not shown), which form a furnace bed surface 4a to which garbage W is supplied in layers by the fuel supply mechanism 3. The fire grids include fixed fire grids and movable fire grids.

The fixed fire grate is fixed to the surface of the wind box 5 facing the upper side Dvu of the wind box 5. The movable fire grate moves at a certain speed to one side Dal (upstream side) and the other side Dar (downstream side), thereby transporting the garbage W on the movable fire grate and the fixed fire grate (on the furnace bed surface 4a) to the downstream side while stirring and mixing. The furnace bed 4 transports the garbage W supplied to the furnace bed surface 4a in layers toward the discharge channel 6 while burning.

Here, the furnace body 2 has a drying section 50, a combustion section 51, and a post-combustion section 52 in order from one side Dal. The drying section 50, the combustion section 51, and the post-combustion section 52 divide the processing space V in the conveying direction Da. The drying section 50 is a region where the garbage W supplied from the hopper 300 is dried before being burned on the furnace bed 4. That is, water evaporates in the drying section 50, so steam is mainly generated from the drying section 50.

The combustion section 51 and the post-combustion section 52 are areas where the garbage W in a dry state is burned on the furnace bed 4. In the combustion section 51, diffuse combustion occurs due to the thermal decomposition gas generated from the garbage W, and a luminous flame F is generated. In the post-combustion section 52, the fixed carbon of the garbage W after diffuse combustion is burned, so the luminous flame F is not generated. Therefore, the luminous flame F generated along with the combustion is mainly formed in the combustion section 51.

(Windbox) The windbox 5 supplies air for combustion (primary air A1) from the bottom of the furnace bed 4 toward the processing space V. The windboxes 5 are arranged in multiple numbers in the conveying direction Da. In this embodiment, the furnace body 2 is divided into a drying section 50, a combustion section 51, and a post-combustion section 52 by the windboxes 5.

(Discharge channel) The discharge channel 6 is a device that allows the garbage W that has become ash after the combustion to fall to the ash extrusion device 19 located on the lower side Dvd of the furnace body 2. The discharge channel 6 is provided at the end of Dar on the other side of the post-combustion section 52.

Here, as shown in FIG. 2 , the furnace body 2 has a tail 203 and a ceiling portion 200. The tail 203 is a part of the wall of the furnace body 2. The tail 203 is formed of a refractory material or the like. The tail 203 is arranged on the other side Dar than the rear combustion section 52 divided by the wind box 5. The tail 203 is connected to the exhaust passage 6 from the upper side Dvu. The tail 203 has a tail surface 204 facing one side Dal. The tail surface 204 of this embodiment is expanded in a plane in the vertical direction Dv and the furnace width direction Dw.

The ceiling part 200 is a part of the wall of the furnace body 2. The ceiling part 200 is formed of a refractory material or the like. The ceiling part 200 is arranged on the side Dvu above the tail 203. The ceiling part 200 is inclined in a direction in which the height in the vertical direction Dv becomes lower as it goes toward the other side Dar. The end of the other side Dar of the ceiling part 200 is connected to the tail 203. Hereinafter, for the sake of convenience, the part of the ceiling part 200 connected to the tail 203 is referred to as the "rear end 201a". Furthermore, the end of one side Dal of the ceiling part 200 on the side opposite to the rear end 201a is referred to as the "front end 201b".

The ceiling part 200 has a flat ceiling surface 201 and a curved surface 202, which is connected to the ceiling surface 201 from one side Dal and is convexly curved toward the upper side Dvu as it goes toward the one side Dal. The ceiling surface 201 is connected to the tail surface 204 of the tail 203 from one side Dal. Therefore, the end of the other side Dar of the ceiling surface 201 is the above-mentioned rear end 201a. The ceiling surface 201 of this embodiment is arranged to face the post-combustion stage 52 in the vertical direction Dv.

The curved surface 202 is connected to the ceiling surface 201 from one side Dal. The curved surface 202 viewed from the furnace width direction Dw is formed into an arc shape having a predetermined curvature radius. Hereinafter, the length of the curved surface 202 viewed from the furnace width direction Dw is defined as "X _R ".

(Furnace) The furnace 7 extends from the furnace body 2 toward the upper side Dvu. The exhaust gas G generated by burning the garbage W in the processing space V is sent to the exhaust heat recovery boiler 12 through the furnace 7. The furnace 7 extends in the vertical direction Dv and is cylindrical with an inner surface 70. The furnace 7 of this embodiment has a rectangular cross section.

The furnace 7 is connected to the ceiling portion 200 from one side Dal. On one side 70a of the inner surface 70 of the furnace 7 facing the one side Dal, it is connected to the curved surface 202 of the ceiling portion 200 from the upper side Dvu. Therefore, the connection portion between the end of the lower side Dvd of one side 70a of the inner surface 70 and the end of the one side Dal of the curved surface 202 is the above-mentioned front end 201b. On the one side 70a, it is vertically expanded from the front end 201b to the upper side Dvu. And, the furnace 7 is connected to the outlet portion 302 of the hopper 300 from the other side Dar. Therefore, the furnace 7 is arranged between the ceiling portion 200 and the outlet portion 302. The furnace 7 of this embodiment is arranged directly above the combustion section 51.

(Blowing fan) As shown in FIG. 1 , the blowing fan 8 is a device for pressing the air for burning the garbage W in the processing space V toward the inside of the combustion furnace 1. The blowing fan 8 includes a first blowing fan 81 and a second blowing fan 82. The first blowing fan 81 presses the air for combustion toward the bellows 5 through the primary air line 9. The second blowing fan 82 presses the air for combustion toward the furnace 7 through the secondary air line 11.

(Primary air line) The primary air line 9 is a pipe connecting the first blowing fan 81 and the wind box 5. By driving the first blowing fan 81, the air required for the combustion of the garbage W is supplied to the wind box 5 through the primary air line 9. The primary air line 9 is connected to the wind box 5 from the lower side DVD. The air supplied to the wind box 5 is directed toward the garbage W from the bottom of the furnace bed 4. In the following, for the convenience of explanation, the air supplied to the inside of the furnace body 2 through the primary air line 9 is referred to as "primary air A1".

The primary air line 9 has a primary air damper 90. The primary air damper 90 is arranged in the middle of the primary air line 9, and the flow rate of the primary air A1 in the primary air line 9 is limited by the opening of the damper of the primary air damper 90.

(Air preheater) The air preheater 10 is a heat exchanger that preheats the air pumped from the first blower 81. The air preheater 10 is provided in the middle of the primary air line 9 and preheats the combustion air flowing from the first blower 81 toward the wind box 5.

The combustion air preheated by the air preheater 10 is supplied to the processing space V, used for the combustion of the garbage W and for heat exchange with the exhaust gas G generated by the combustion of the garbage W. Therefore, the air preheater 10 can adjust the temperature of the exhaust gas G by adjusting the temperature of the combustion air.

(Secondary air line) The secondary air line 11 is a pipe connecting the second blowing fan 82 and the furnace 7. By driving the second blowing fan 82, the air necessary for the combustion of the garbage W is supplied to the furnace 7 through the secondary air line 11. The secondary air line 11 passes through the furnace 7 from the outside. As shown in FIG. 2, the front end of the secondary air line 11 is arranged inside the inner surface 70 of the furnace 7. The secondary air A2 supplied to the furnace 7 is directed toward the garbage W from the top of the furnace bed 4. In the following, for the convenience of explanation, the air supplied to the inside of the furnace body 2 through the secondary air line 11 is referred to as "secondary air A2".

As shown in FIG. 1 , the secondary air line 11 has a secondary air damper 110 . The secondary air damper 110 is provided in the middle of the secondary air line 11 , and the flow rate of the secondary air A2 is restricted by the opening of the damper of the secondary air damper 110 .

(Garbage pit) The garbage pit 18 stores garbage W and supplies the garbage W to the hopper 300. The garbage pit 18 has: a garbage pit body 180, a platform 181, a crane 182, and a crane control device 189.

The garbage pit body 180 is a space for storing garbage W on the side of the combustion furnace 1. The garbage pit body 180 is connected to the inlet 301 of the hopper 300. That is, the inside of the hopper 300 is connected to the inside of the garbage pit body 180, and garbage W can be supplied from the inside of the garbage pit body 180 to the inside of the hopper 300.

The platform 181 is a carrying port for carrying garbage W into the garbage pit body 180. The platform 181 is connected to a carrying opening formed on one side Dal of the garbage pit body 180. A garbage collection truck T is carried in from the outside of the combustion equipment 100 to the platform 181. The garbage collection truck T puts the carried garbage W into the garbage pit body 180.

The crane 182 grabs a portion of the garbage W stored in the garbage pit body 180 and transfers the grabbed garbage W from the garbage pit body 180 to the entrance 301 of the hopper 300. The crane 182 is provided on the ceiling portion of the upper side Dvu of the garbage pit body 180.

The crane 182 includes a rail 183 provided on the ceiling, a beam 184 running along the rail 183 , a trolley 185 moving on the beam 184 , a cable 186 suspended from the trolley 185 , a winding machine 187 for winding up and lowering the cable 186 , and a claw 188 mounted on the front end of the cable 186 .

The crane control device 189 is a device for controlling the travel of the beam 184, the movement of the crane 185, the winding and lowering of the cable 186 by the winder 187, and the clamping action of the clamping claw 188.

(Ash extrusion device) The ash extrusion device 19 is a device that receives the garbage W (ash) that falls to the lower side DVD than the furnace body 2 through the discharge channel 6 and extrudes it to the subsequent ash pit 20. The ash extrusion device 19 has an extrusion device body 190 and an extrusion mechanism (omitted in the figure).

The extruder body 190 receives and temporarily accumulates the garbage W that has been burned and turned into ash in the processing space V. The extruder body 190 is arranged on the lower side Dvd than the furnace body 2. The extruder body 190 is connected to the discharge channel 6 from the lower side Dvd. The extruder mechanism extrudes the garbage W (ash) that falls into the extruder body 190 toward the ash pit 20.

(Ash pit) The ash pit 20 is a space for receiving the garbage W in the extruder and storing it inside. The ash pit 20 of this embodiment is connected to the extruder body 190 from the other side Dar. The garbage W stored in the ash pit 20 is transferred to the outside of the combustion equipment 100 by, for example, an ash crane (omitted in the figure).

(Exhaust Gas Recirculation System) The exhaust gas recirculation system 21 is an EGR (Exhaust Gas Recirculation) system that returns part of the exhaust gas G after combustion flowing in the outlet flow path 15 to the inside of the furnace body 2. The exhaust gas recirculation system 21 has an exhaust gas recirculation pipeline 22, a nozzle 23, and a fan 24.

(Exhaust gas recirculation pipeline) The exhaust gas recirculation pipeline 22 connects the outlet flow path 15 and the furnace body 2. One end of the exhaust gas recirculation pipeline 22 of this embodiment is connected to the vicinity of the dust collecting device 14 of the outlet flow path 15, and the other end of the exhaust gas recirculation pipeline 22 is connected to the furnace tail 203 of the furnace body 2 through the nozzle 23.

(Nozzle) The nozzle 23 is a circular nozzle that supplies (releases) the exhaust gas G supplied through the exhaust gas recirculation pipeline 22 to the inside of the furnace body 2. The nozzle 23 is connected to the other end of the exhaust gas recirculation pipeline 22. As shown in Figures 2 and 3, the nozzle 23 of this embodiment is cylindrical with the center line O extending at the center. The nozzle 23 is fixed to the furnace tail 203 in a state of passing through the furnace tail 203.

The nozzles 23 are arranged in plurality at the furnace tail 203 at intervals in the furnace width direction Dw with the same height in the vertical direction Dv. In the present embodiment, two nozzles 23 are arranged at intervals in the furnace width direction Dw at the furnace tail 203. In FIG. 2 , only one nozzle 23 is shown due to the type of the drawing.

The nozzle 23 opens to the inside of the furnace body 2 in a state facing the inside of the furnace body 2. The nozzle 23 is fixed to the furnace tail 203 in a manner that the center of the opening is aligned with the furnace tail surface 204. In this embodiment, the exhaust gas G emitted by the nozzle 23 expands into a cone shape with the opening of the nozzle 23 as the center. Hereinafter, the opening diameter of the nozzle 23 in this embodiment is set as "D".

Here, the horizontal distance between the rear end 201a and the front end 201b is set as "X", the vertical distance between the front end 201b and the opening center of the nozzle 23 is set as "H", the angle between the ceiling and the horizontal plane Hp is set as "α", and the angle between the center line O of the nozzle 23 and the horizontal plane Hp is set as "β". In this case, the nozzle 23 is arranged at the tail 203 in a manner that satisfies the following formula (I).

In addition, the horizontal distance referred to here is a two-dimensional geometric distance representing the horizontal direction. And, the vertical distance is a one-dimensional geometric distance representing the vertical direction Dv. And, "atan((H/X)+tan(α))-β" on the left side of formula (I) is greater than 0.

The following is an explanation of the derivation process of formula (I). When the vertical distance between the front end 201b and the rear end 201a is set to "H1", the vertical distance between the rear end 201a and the opening center of the nozzle 23 is set to "H2", and the release angle of the exhaust gas G based on the center line O of the nozzle 23 is set to "γ", the following formula (II) is established. In addition, γ is greater than 0.

The following formula (III) is obtained by transforming the formula (II).

Here, 0.172 on the right side of formula (III) is an experimental constant. That is, as shown in FIG3 , when the predetermined distance from the opening center of the nozzle 23 on the center line O is set to "D1", and the distance of the exhaust gas G expanded from the center line O at a position separated by a predetermined distance from the opening center of the nozzle 23 is set to "D2", the following formula (IV) is substituted into the above formula (II) by the relationship with the above γ, so that the above formula (III) is established.

By modifying the above formula (III), the following formula (V) is derived, which is the above formula (I).

Here, based on the relationship between the opening diameter D of the nozzle 23 and the length _XR of the curved surface 202 when viewed in the furnace width direction Dw, the opening diameter of the nozzle 23 is set to satisfy the following formula (VI).

Furthermore, in the present embodiment, the relationship between um obtained from the following formula (VII) and the left part (X _R /D) of the formula (VI) preferably conforms to the following formula (VIII).

In formula (VII), u ₀ is the nozzle flow rate determined by the type of nozzle 23, etc. Formula (VII) is derived from "Jet Engineering" by Toshihiko Shagochi, Mori Kita Publishing (2004). Formula (VIII) is a prediction formula constructed by the inventors based on experimental data cited in "Proceedings of the Japan Society of Mechanical Engineers (Edition B)" by Toshihiko Shagochi, 56, 532 (1990).

(Fan) The fan 24 supplies the exhaust gas G to the nozzle 23 through the exhaust gas recirculation pipeline 22. As shown in FIG1 , the fan 24 is arranged in the middle of the exhaust gas recirculation pipeline 22. The fan 24 is driven to pressurize a part of the exhaust gas G in the outlet flow path 15 to the nozzle 23. The fan 24 is controlled by the control device 30 arranged outside the combustion furnace 1.

Specifically, the fan 24 receives a signal indicating the number of revolutions from the control device 30 via wired or wireless communication. That is, the fan 24 rotates based on the number of revolutions indicated by the signal, extracts a portion of the exhaust gas G in the outlet flow path 15 from the outlet flow path 15, and delivers the gas toward the nozzle 23. Furthermore, the fan 24 transmits a signal indicating its own output number of revolutions to the control device 30 via wired or wireless communication at predetermined time intervals.

(Exhaust gas discharged from the nozzle) The following describes the exhaust gas G discharged from the nozzle 23 to the inside of the furnace body 2. As shown in FIG2, a portion of the exhaust gas G discharged from the nozzle 23 that meets the relationship shown in the above formula (I) collides with the ceiling surface 201 of the ceiling part 200 from the lower side DVD. For the sake of convenience, the exhaust gas G discharged from the nozzle 23 is referred to as "nozzle gas".

The nozzle gas that hits the ceiling surface 201 forms a flattened wall jet Jw that expands along the ceiling surface 201. The nozzle gas flows toward one side Dal along the ceiling surface 201 while forming the wall jet Jw. That is, the wall jet Jw becomes a thin sheet that expands along the ceiling surface 201. At this time, the nozzle gases emitted from the two nozzles 23 each flow along the ceiling surface 201, thereby forming a wall jet Jw that merges with each other.

A portion of the wall jet Jw that reaches the curved surface 202 disposed on one side Dal of the ceiling surface 201 goes straight in the expansion direction of the ceiling surface 201. Hereinafter, for convenience of explanation, the wall jet Jw that passes through the curved surface 202 and goes straight in the expansion direction of the ceiling surface 201 to the other side Dar is referred to as "the first jet Jw1". The first jet Jw1 is a portion that flows to cover the upper side Dvu of the combustion stage 51 in the opening portion of the furnace 7 toward the lower side Dvd from the lower side Dvd.

On the other hand, among the wall jets Jw reaching the curved surface 202, a part of the wall jet Jw different from the first jet Jw1 flows toward the inside of the furnace 7 along the curved surface shape of the curved surface 202. That is, the wall jet Jw flows toward the upper side Dvu from the upper side Dvu of the first jet Jw1 toward the inside of the furnace 7 due to the Coanda effect. Hereinafter, for convenience of explanation, the wall jet Jw that enters the inside of the furnace 7 along the curved surface shape of the curved surface 202 is referred to as "second jet Jw2". 2, in order to simplify the description, among the wall jets Jw passing through the curved portion, only the flow coating of the first jet Jw1 and the second jet Jw2 is shown.

(Exhaust gas concentration acquisition unit) The exhaust gas concentration acquisition unit 25 acquires the concentrations of CO and _NOx contained in the exhaust gas G generated from the combustion furnace 1. The exhaust gas concentration acquisition unit 25 is arranged in the outlet flow path 15. The exhaust gas concentration acquisition unit 25 has a CO sensor 25a and a _NOx sensor 25b. Hereinafter, the concentration of CO contained in the exhaust gas G is referred to as "CO concentration", and the concentration of _NOx contained in the exhaust gas G is referred to as " _NOx concentration".

The CO sensor 25a obtains the CO concentration of the exhaust gas G flowing in the outlet flow path 15 at a predetermined time interval, and transmits a signal indicating the CO concentration to the control device 30 through wired or wireless communication. The _NOx sensor 25b obtains the _NOx concentration of the exhaust gas G flowing in the outlet flow path 15 at a predetermined time interval, and transmits a signal indicating the _NOx concentration to the control device 30 through wired or wireless communication. The CO sensor 25a and the _NOx sensor 25b of the present embodiment obtain, for example, the CO concentration and the _NOx concentration in the exhaust gas G per unit flow rate.

(Control device) The control device 30 receives and sends signals between the above-mentioned various devices to adjust the flow rate of the exhaust gas G discharged from the nozzle 23. As shown in FIG. 4, the control device 30 of this embodiment has: a detection unit 31, a determination unit 32, an adjustment unit 33, and a memory unit 34.

(Detection Unit) The detection unit 31 receives a signal indicating the CO concentration obtained by the CO sensor 25a of the exhaust gas concentration acquisition unit 25 and a signal indicating the _NOx concentration obtained by the _NOx sensor 25b, thereby detecting the CO concentration and the _NOx concentration of the exhaust gas G flowing in the outlet flow path 15. The detection unit 31 transmits a signal indicating the detection result (CO concentration and _NOx concentration) to the determination unit 32 and the adjustment unit 33.

(Determination Unit) The determination unit 32 determines whether the CO concentration and the _NOx concentration detected by the detection unit 31 are appropriate concentrations. Specifically, the determination unit 32 compares the CO concentration detected by the detection unit 31 with the CO concentration threshold stored in the memory unit 34.

The determination unit 32 determines that the CO concentration is appropriate when the CO concentration detected by the detection unit 31 is below the CO concentration threshold. On the other hand, the determination unit 32 determines that the CO concentration is inappropriate when the CO concentration detected by the detection unit 31 is greater than the CO concentration threshold.

Furthermore, the determination unit 32 determines that the _NOx concentration is appropriate when the NOx concentration detected by the detection unit 31 is below the _NOx concentration threshold. On the other hand, the determination unit 32 determines that _{the NOx} concentration is inappropriate when the _NOx concentration detected by the detection unit 31 is greater than the _NOx concentration threshold. The determination unit 32 transmits a signal indicating the determination result to the adjustment unit 33.

(Adjustment Unit) The adjustment unit 33 adjusts the flow rate of the exhaust gas G supplied to the inside of the furnace body 2 through the nozzle 23 when receiving the CO concentration and _NOx concentration transmitted from the detection unit 31. In addition, the adjustment unit 33 adjusts the flow rate of the exhaust gas G supplied to the inside of the furnace body 2 through the nozzle 23 based on the determination result of the determination unit 32.

When the adjustment unit 33 receives the CO concentration from the detection unit 31, it transmits a signal indicating a rotation speed increase command to the fan 24. On the other hand, when the adjustment unit 33 receives the _NOx concentration from the detection unit 31, it transmits a signal indicating a rotation speed increase command to the fan 24.

When the determination unit 32 determines that the CO concentration is appropriate, the adjustment unit 33 transmits a signal indicating a speed reduction command to the fan 24. On the other hand, when the determination unit 32 determines that the CO concentration is inappropriate, the adjustment unit 33 transmits a signal indicating a speed increase command to the fan 24.

When the determination unit 32 determines that the _NOx concentration is appropriate, the adjustment unit 33 transmits a signal indicating a speed reduction command to the fan 24. On the other hand, when the determination unit 32 determines that the _NOx concentration is inappropriate, the adjustment unit 33 transmits a signal indicating a speed increase command to the fan 24.

(Operation of the control device) Next, the operation of the control device 30 will be described. Hereinafter, referring to FIG. 5 , an example of the operation of the control device 30 when the detection unit 31 receives a signal indicating the CO concentration from the exhaust gas concentration acquisition unit 25 will be described.

The detection unit 31 receives the CO concentration from the exhaust gas concentration acquisition unit 25, thereby detecting the CO concentration contained in the exhaust gas G in the outlet flow path 15 (step S0). Then, the adjustment unit 33, upon receiving the detection result from the detection unit 31, transmits a signal indicating a rotation speed increase instruction to the fan 24, thereby increasing the flow rate of the exhaust gas G supplied to the inside of the furnace body 2 (step S1).

Next, upon receiving the detection result from the detection unit 31, the determination unit 32 determines whether the CO concentration detected by the detection unit 31 is an appropriate concentration (step S2). When the determination unit 32 determines that the CO concentration is appropriate (step S2: YES), the adjustment unit 33 transmits a signal indicating a speed reduction instruction to the fan 24, thereby reducing the flow rate of the exhaust gas G supplied to the inside of the furnace body 2 (step S3). When the processing of step S3 is completed, the processing of step S0 is performed again.

When the determination unit 32 determines that the CO concentration is inappropriate (step S2: NO), the adjustment unit 33 receives the determination result from the determination unit 32 and transmits a signal indicating a relayed increase command to the fan 24, thereby increasing the flow rate of the exhaust gas G supplied to the interior of the furnace body 2 (step S1'). When the processing of step S1' is completed, the processing of step S2 is performed again.

The processes from step S0 to step S3 described above are repeatedly executed during the operation phase of the combustion equipment 100.

Next, an example of the operation of the control device 30 when the detection unit 31 receives the signal indicating the NO _x concentration from the exhaust gas concentration acquisition unit 25 will be described with reference to FIG. 6 .

The detection unit 31 receives the _NOx concentration from the exhaust gas concentration acquisition unit 25, thereby detecting the _NOx concentration contained in the exhaust gas G in the outlet flow path 15 (step S10). Then, the adjustment unit 33, upon receiving the detection result from the detection unit 31, transmits a signal indicating a rotation speed increase instruction to the fan 24, thereby increasing the flow rate of the exhaust gas G supplied to the inside of the furnace body 2 (step S11).

Next, upon receiving the detection result from the detection unit 31, the determination unit 32 determines whether the _NOx concentration detected by the detection unit 31 is an appropriate concentration (step S12). When the determination unit 32 determines that the _NOx concentration is appropriate (step S12: YES), the adjustment unit 33 transmits a signal indicating a speed reduction instruction to the fan 24 to reduce the flow rate of the exhaust gas G supplied to the inside of the furnace body 2 (step S13). When the processing of step S13 is completed, the processing of step S10 is performed again.

When the determination unit 32 determines that the _NOx concentration is inappropriate (step S12: NO), the adjustment unit 33 receives the determination result from the determination unit 32 and transmits a signal indicating a relayed increase command to the fan 24, thereby increasing the flow rate of the exhaust gas G supplied to the inside of the furnace body 2 (step S11'). When the processing of step S11' is completed, the processing of step S12 is performed again.

The processes from step S10 to step S13 described above are repeatedly executed during the operation phase of the combustion equipment 100.

(Effects) According to the combustion equipment 100 of the above-mentioned embodiment, the nozzle 23 is arranged at the furnace tail 203 in such a direction that the nozzle gas forms a wall jet Jw along the ceiling portion 200 of the furnace body 2. As a result, a part of the exhaust gas G that rises on the lower side Dvd than the wall jet Jw with the combustion of the garbage W collides with the wall jet Jw from the lower side Dvd. A part of the exhaust gas G that collides with the wall jet Jw is bounced back to the lower side Dvd and stays inside the furnace body 2. Therefore, the exhaust gas G is prevented from directly flowing into the furnace 7, and the mixing with the unburned gas such as CO inside the furnace body 2 is strengthened, so that the retention time of the exhaust gas G inside the furnace body 2 can be increased. As a result, the increase of the CO concentration and _NOx concentration in the exhaust gas G inside the furnace body 2 can be suppressed.

Here, when the nozzle gas discharged from the plurality of nozzles 23 forms a free jet that does not flow along the ceiling portion 200, a gap may occur between the free jets discharged from each nozzle 23. At this time, the exhaust gas G generated by the burning of the garbage W may pass through the gap between the free jets and pass to the upper side Dvu. According to the combustion equipment 100 of the above-mentioned embodiment, the nozzle gas discharged from the plurality of nozzles 23 merges with each other to form a wall jet Jw along the ceiling surface 201 of the ceiling portion 200, so it is difficult for a gap to occur between the wall jets Jw formed by the nozzle gas discharged from each nozzle 23. Therefore, the exhaust gas G generated by the combustion of the garbage W can be prevented from passing to the upper side Dvu than the wall jet Jw. As a result, the retention time of the exhaust gas G inside the furnace body 2 can be further increased. In addition, the volatile components generated from the garbage W can be prevented from being locally present in a high concentration state in the lower part of the furnace 7 (lower side Dvd than the connection part between the furnace 7 and the secondary air line 11).

Furthermore, since the nozzle gas forms a flattened wall jet Jw along the ceiling surface 201, the jet width of the nozzle gas in the vertical direction Dv can be suppressed to be smaller than when the nozzle gas forms a free jet. As a result, the position where the exhaust gas G collides with the nozzle gas and is accelerated becomes further upward Dvu than when the nozzle gas forms a free jet. In other words, the retention time of the exhaust gas G inside the furnace body 2 can be further increased. Therefore, compared with when the nozzle gas forms a free jet, the exhaust gas G can be retained inside the furnace body 2 for a longer time.

Furthermore, according to the combustion equipment 100 of the above embodiment, the nozzle 23 is arranged in the furnace tail 203 in a manner conforming to the above formula (I). Thus, a wall jet Jw along the ceiling portion 200 can be effectively formed inside the furnace body 2. Furthermore, the above effects can be realized by a specific setting.

Furthermore, according to the combustion equipment 100 of the above-mentioned embodiment, the ceiling portion 200 has a ceiling surface 201 and a curved surface 202 connected to the inner surface 70 of the furnace 7. Thus, the curved surface 202 causes a Coanda effect on the wall jet Jw. That is, a part of the wall jet Jw flowing along the ceiling surface 201, that is, the second jet Jw2, flows along the curved surface 202 and flows toward the upper side Dvu inside the furnace 7. The second jet Jw2 flowing toward the upper side Dvu flows while expanding inside the furnace 7, thereby mixing with the exhaust gas G generated by the combustion of the garbage W and flowing into the furnace 7. As a result, the distribution deviation of CO and NO _x in the exhaust gas G in the furnace 7 can be suppressed.

Furthermore, according to the control device 30 of the above-mentioned embodiment, the adjustment unit 33 increases or decreases the number of revolutions of the fan 24 when one or more of the CO concentration and the _NOx concentration in the exhaust gas G flowing in the outlet flow path 15 increases or decreases according to the detection result of the detection unit 31. In this way, the CO concentration and the NOx concentration in the exhaust gas G inside the furnace body 2 and the exhaust gas G discharged to the outside of the furnace body 2 can be made appropriate. For example, when the detection unit 31 detects CO or _NOx , the adjustment unit 33 increases the number of revolutions of the fan 24, thereby enhancing the above-mentioned effect. As a result, the _CO concentration and the _NOx concentration in the exhaust gas G can be reduced.

(Other embodiments) The embodiments of the present invention are described in detail above with reference to the drawings, but the specific structure is not limited to the structure of each embodiment, and the structure can be added, omitted, replaced, and otherwise modified within the scope of the present invention.

7 is a hardware structure diagram showing the structure of a computer 1100 according to this embodiment. The computer 1100 includes a processor 1110 , a main memory 1120 , a storage 1130 , and an interface 1140 .

The control device 30 is implemented in the computer 1100. Then, the operation of each processing unit is stored in the memory 1130 in the form of a program. The processor 1110 reads the program from the memory 1130 and expands it in the main memory 1120, and executes the above-mentioned processing according to the program. In addition, the processor 1110 ensures the memory area corresponding to the above-mentioned memory unit 34 in the main memory 1120 according to the program.

The program may be used to implement a part of the functions performed by the computer 1100. For example, the program may be combined with other programs stored in the memory 1130 or with other programs installed in other devices to perform the functions. Furthermore, the computer 1100 may have a customized LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to the above-mentioned structure or instead of the above-mentioned structure. Examples of PLD include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, part or all of the functions implemented by the processor 1110 may be implemented by the integrated circuit.

Examples of the storage 1130 include a disk, an optical disk, a semiconductor memory, etc. The storage 1130 may be an internal medium directly connected to the bus of the computer 1100, or an external medium connected to the computer 1100 through the interface 1140 or a communication line. Furthermore, when the program is transmitted to the computer 1100 through the communication line, the computer 1100 receiving the transmission may expand the program into the main memory 1120 to execute the above-mentioned processing. In the above-mentioned embodiment, the storage 1130 is a non-temporary and tangible storage medium.

Furthermore, the program may be a part of the aforementioned function. In addition, the program may be a combination of the aforementioned function and other programs stored in the memory 1130, i.e., a difference file (difference program).

Furthermore, in the embodiment, although the structure in which two nozzles 23 are arranged at a distance in the furnace width direction Dw at the furnace tail 203 is described, the present invention is not limited to this structure. One nozzle 23 may be arranged at the furnace tail 203. Furthermore, three or more nozzles 23 may be arranged at a distance in the furnace width direction Dw at the furnace tail 203.

Furthermore, the ceiling portion 200 described in the embodiment may be formed of a material having a higher wear resistance than the tail 203. As a material having a high wear resistance adopted in the ceiling portion 200, for example, SiC (silicon carbide) can be cited. Thus, even if fly ash (ash) contained in the wall jet Jw collides with the ceiling portion 200, the wear of the ceiling portion 200 can be suppressed. Furthermore, in addition to the above-mentioned structure, the furnace 7 may be formed of a material having a higher wear resistance than the tail 203.

Furthermore, in the embodiment, although the nozzle 23 is described as a circular nozzle, it is not limited to a circular nozzle.

Furthermore, in the embodiment, the combustion equipment 100 is a furnace-type combustion furnace, but it is not limited to the furnace-type combustion furnace. The combustion equipment 100 may be, for example, a kiln, a biomass fluidized bed boiler, a sludge combustion furnace, etc. Therefore, the control device 30 may be a control device of the combustion equipment 100 such as a kiln, a biomass fluidized bed boiler, a sludge combustion furnace, etc.

[Note] The combustion equipment 100 and the control device 30 described in the embodiment are, for example, understood as follows.

(1) A first type of combustion equipment 100 comprises: a furnace body 2 in which a burnt material W is transported while being burned, and a nozzle 23 for supplying a portion of exhaust gas G discharged from the furnace body 2 to the interior of the furnace body 2. The nozzle 23 is arranged at a furnace tail 203 of the furnace body 2 in such a direction that the exhaust gas G supplied to the interior of the furnace body 2 forms a wall jet Jw along a ceiling portion 200 of the furnace body 2.

As a result, part of the exhaust gas G that rises on the lower side Dvd as the waste W burns will collide with the wall jet Jw from the lower side Dvd. Part of the nozzle gas that has collided with the wall jet Jw is bounced back to the lower side Dvd and remains inside the furnace body 2.

(2) The second embodiment of the combustion equipment 100 is the combustion equipment 100 of the first embodiment, wherein the plurality of nozzles 23 are arranged at the furnace tail 203, and the plurality of nozzles 23 are arranged so that the exhaust gas G flows along the ceiling portion 200, thereby forming the wall jets Jw that merge with each other.

Thereby, a gap is unlikely to occur between the wall jets Jw formed by the exhaust gas G discharged from each nozzle 23. Therefore, it is possible to suppress the exhaust gas G generated by the combustion of the waste W from passing to the upper side Dvu than the wall jets Jw.

(3) The third embodiment of the combustion equipment 100 is the combustion equipment 100 of the first embodiment or the second embodiment, wherein the ceiling portion 200, when connected to the furnace tail 203, is inclined in a direction in which the height in the vertical direction Dv decreases as the direction of conveyance of the waste W is directed, and the portion of the ceiling portion 200 connected to the furnace tail 203, i.e., the rear end 201a, is inclined in a direction in which the height in the vertical direction Dv decreases as the direction of conveyance of the waste W is directed, and the portion of the ceiling portion 200 connected to the furnace tail 203, i.e., the rear end 201a, is inclined in a direction in which the height in the vertical direction Dv decreases as the direction of conveyance of the waste W is directed. When the horizontal distance between the front end 201b of the nozzle 23 is set to X, the vertical distance between the front end 201b and the center of the opening of the nozzle 23 is set to H, the angle between the ceiling portion 200 and the horizontal plane Hp is set to α, and the angle between the center line O of the nozzle 23 and the horizontal plane Hp is set to β, the nozzle 23 may be arranged at the tail 203 to meet atan((H/X)+tan(α))-β＜10.

Thereby, the above-mentioned effects can be realized with specific settings.

(4) The combustion device 100 of the fourth embodiment is the combustion device 100 of the third embodiment, further comprising a furnace 7 extending upward from the furnace body 2 and having an inner surface 70 connected to the ceiling portion 200, wherein the ceiling portion 200 comprises: a ceiling surface 201 which is planar, and a curved surface 202 which connects the inner surface 70 and the ceiling surface 201 and may be curved upward from the ceiling surface 201 toward the inner surface 70.

Thus, the curved surface 202 causes a Coanda effect on the wall jet Jw. That is, a part of the wall jet Jw flowing along the ceiling surface 201 flows along the curved surface 202 and flows upward to the side Dvu inside the furnace 7.

(5) The control device 30 of the fifth embodiment is the control device 30 of the combustion equipment 100 of any one of the first to fourth embodiments, wherein the combustion equipment 100 further comprises: a portion of the exhaust gas G is supplied to the fan 24 of the nozzle 23 through the exhaust gas recirculation pipeline 22, and has: a detection unit 31 that detects the CO concentration and the _NOx concentration in the exhaust gas G; and an adjustment unit 33 that increases or decreases the number of revolutions of the fan 24 when one or more of the CO concentration and the _NOx concentration in the exhaust gas G increases or decreases based on the detection result of the detection unit 31.

Thereby, the CO concentration and _NOx concentration in the exhaust gas G inside the furnace body 2 and the exhaust gas G discharged to the outside of the furnace body 2 can be made appropriate. [Industrial Applicability]

According to the present invention, a combustion device and a control device that can increase the residence time of exhaust gas in a furnace body can be provided.

1: Combustion furnace 2: Furnace body 3: Furnace supply mechanism 4: Furnace bed 4a: Furnace bed surface 5: Wind box 6: Exhaust channel 7: Furnace 8: Blower 9: Primary air pipeline 10: Air preheater 11: Secondary air pipeline 12: Exhaust heat recovery boiler 13: Cooling tower 14: Dust collector 15: Outlet flow path 16: Chimney 17: Guide fan 18: Garbage pit 19: Ash extrusion device 20: Ash pit 21: Exhaust gas recirculation system 22: Exhaust gas recirculation pipeline 23: Nozzle 24: Fan 25: Exhaust gas concentration acquisition unit 25a: CO sensor 25b: NO _X sensor 30: control device 31: detection unit 32: determination unit 33: adjustment unit 34: memory unit 50: drying section 51: combustion section 52: post-combustion section 70: inner surface 70a: one side 81: first blowing fan 82: second blowing fan 90: primary air damper 100: combustion equipment 110: secondary air damper 180: garbage pit Main body 181: platform 182: crane 183: track 184: beam 185: trolley 186: cable 187: reel 188: claw 189: crane control device 190: extruder main body 200: ceiling 201: ceiling surface 201a: rear end 201b: front end 202: curved surface 203: furnace tail 204: furnace Tail surface 300: Hopper 301: Entrance 302: Exit 302a: Floor 310: Feeder 311: Upper surface 312: Extrusion surface 1100: Computer 1110: Processor 1120: Main memory 1130: Storage 1140: Interface A1: Primary air A2: Secondary air Da: Transport direction Dal: One side Dar : The other side Dv: Lead vertical direction Dvd: Lower side Dvu: Upper side Dw: Furnace width direction F: Light flame G: Exhaust Hp: Horizontal plane Jw: Wall spray Jw1: First spray Jw2: Second spray O: Center line R: Storage space R1: Primary combustion area R2: Secondary combustion area T: Garbage collection truck V: Processing space W: Waste to be burned, garbage

[Figure 1] A diagram showing the structure of a combustion device in an embodiment of the present invention. [Figure 2] An enlarged diagram of the main parts of the combustion device in an embodiment of the present invention. [Figure 3] A diagram showing the structure of the nozzle in an embodiment of the present invention. [Figure 4] A functional block diagram of a control device in an embodiment of the present invention. [Figure 5] A flow chart showing an example of the operation of the control device in an embodiment of the present invention. [Figure 6] A flow chart showing an example of the operation of the control device in an embodiment of the present invention. [Figure 7] A hardware structure diagram showing the structure of a computer in an embodiment of the present invention.

2: Furnace body

4: Furnace

4a: Furnace bed surface

5: Bellows

6: Exhaust channel

7: Fireplace

9:1 air pipeline

11: Secondary air pipeline

21: Exhaust gas recirculation system

22: Exhaust gas recirculation pipeline

23: Spray nozzle

50: Drying stage

51: Combustion section

52: Afterburning section

70:Inside

70a: On the one hand

200: Ceiling part

201: Ceiling surface

201a: Backend

201b:Front end

202: Curved surface

203: Furnace tail

204: Furnace tail surface

300: Hopper

302: Export Department

A1: 1st air

A2: Secondary air

Da: Transportation direction

Dal: one side

Dar: The other side

Dv: vertical direction of lead

DVD: bottom side

Dvu: upper side

Dw: furnace width direction

F: Light Flame

G: Exhaust

Hp: horizontal plane

Jw: wall jet

Jw1: No. 1 jet

Jw2: 2nd jet

V: Processing space

W: Burnt waste, garbage

H, H1, H2: vertical distance of lead

X: horizontal distance

Claims (4)

A combustion device, comprising: a furnace body in which the burnt material is transported while being burned, a nozzle for supplying a part of the exhaust gas discharged from the furnace body to the inside of the furnace body, the nozzle is arranged at the tail of the furnace body in such a direction that the exhaust gas supplied to the inside of the furnace body forms a wall spray along the ceiling of the furnace body, the nozzle supplies the exhaust gas from the opening of the nozzle in a cone-shaped diffusion manner, thereby causing a part of the exhaust gas to collide with the ceiling of the furnace body from the lower side to form the wall spray, the nozzle is arranged in plurality at the tail of the furnace with intervals in the road width direction, The intervals between the plurality of nozzles are set so as to form the wall spraying before the exhaust gas is supplied from each nozzle and merges with each other. The combustion equipment as described in claim 1, wherein the ceiling portion, when connected to the tail, is inclined in a direction in which the height in the vertical direction becomes lower as the direction of conveying the burnt material is approached, the horizontal distance between the portion of the ceiling portion connected to the tail, i.e., the rear end, and the front end of the ceiling portion on the side opposite to the rear end is set as X, the vertical distance between the front end and the center of the opening of the nozzle is set as H, the angle between the ceiling portion and the horizontal plane is set as α, and the angle between the center line of the nozzle and the horizontal plane is set as β, the nozzle is arranged at the tail in accordance with: The combustion equipment as described in claim 2, wherein, there is further provided a furnace extending upward from the furnace body and having its inner surface connected to the ceiling portion, the ceiling portion having: a ceiling surface in a planar shape, and a curved surface connecting the inner surface and the ceiling surface and forming a curved surface that faces upward as it moves from the ceiling surface toward the inner surface. A control device is a control device for a combustion device as described in any one of claim 1 to claim 3, wherein the combustion device further comprises: a fan for supplying a portion of the exhaust gas to the nozzle through an exhaust gas recirculation pipeline, and having: a detection unit for detecting CO concentration and _NOx concentration in the exhaust gas; and an adjustment unit for increasing or decreasing the number of revolutions of the fan when one or more of the CO concentration and _NOx concentration in the exhaust gas increases or decreases based on the detection result of the detection unit.

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