CN201093488Y - Horizontal shade type micro oil mass igniting powdered coal burner - Google Patents

Abstract

The utility model provides a horizontal thick-and-thin miniature oil-volume ignition coal-powder burner, relating to the coal-powder burner and aiming to solve the problems of single function, invisible oil-saving, great influence on the air power field of a boiler and easily-worn guide plate of the existing ignition coal-powder burner. The inlets of a gas film wind box and a peripheral wind box are respectively arranged at the bottom sides of the gas film wind box and the peripheral wind box; a thick-phase coal-powder guide plate is fixed at the middle part of a burner secondary chamber shell; a burner secondary chamber is formed in the burner secondary chamber shell at the outlet end of the thick-phase coal-powder guide plate; a burner primary chamber is formed in the burner secondary chamber shell at the lower side of the thick-phase coal-powder guide plate. The utility model used as a main burner can also be operated as the horizontal thick-and-thin coal-powder burner, realizing not only the function of reducing discharge of the pollutant such as NOx through the horizontal thick-and-thin coal-powder burner, but also the low load function of the horizontal thick-and-thin coal-powder burner. The horizontal thick-and-thin miniature oil-volume ignition coal-powder burner has high oil-saving rate, little influence on the air power field of the boiler, convenient maintenance and service, and low cost.

Description

Horizontal thick and thin type micro-oil ignition pulverized coal burner

technical field

The utility model relates to a pulverized coal burner.

Background technique

The existing micro-oil ignition burner and gasification small oil gun ignition pulverized coal burner have a single function, either as the main burner, or as a boiler NOx reduction, or used for stable combustion of the pulverized coal burner. And there are defects such as not obvious fuel saving, great influence on the aerodynamic field of the boiler, high resistance of the burner, easy coking in the burner, and easy wear and tear of the deflector. It is difficult and expensive to replace and maintain the deflector.

Utility model content

The purpose of this utility model is to solve the problem of the existing micro-oil ignition burner and gasification small oil gun ignition pulverized coal burner, which are relatively single, or run as the main burner, or used as a boiler NOx reduction, or used for coal The stable combustion of the powder burner is used, and there are defects such as not obvious fuel saving, great influence on the aerodynamic field of the boiler, large burner resistance, easy coking in the burner, easy wear of the guide plate, and difficulty in replacing and maintaining the guide plate To solve the problems of large and high cost, a horizontal thick-thin type micro-oil ignition pulverized coal burner is provided. The utility model comprises dense phase pulverized coal rectification block, gas film wind and peripheral wind chamber, main oil gun chamber, peripheral wind housing, burner inner nozzle, burner outer nozzle, dense phase pulverized coal deflector and burner two The secondary chamber casing, the burner inner nozzle, the burner outer nozzle and the burner secondary chamber casing are all square in cross section, the inlet of the burner inner nozzle is connected to the outlet of the burner secondary chamber casing, and the surrounding The casing is set outside the front part of the casing of the secondary chamber of the burner, the outer nozzle of the burner is fixed outside the inner nozzle of the burner, the inlet end of the outer nozzle of the burner is fixedly connected with the outlet end of the peripheral air casing, and the peripheral air casing and Air film wind and peripheral air channels are formed between the secondary chamber shells of the burner, a peripheral air channel is formed between the outer nozzle of the burner and the inner nozzle of the burner, and an air film is provided between the secondary chamber shell of the burner and the inner nozzle of the burner The wind inlet, the air film wind and the peripheral wind chamber are fixed on the outside of the burner secondary chamber housing on the side of the inlet end of the peripheral wind housing. The bottom side of the chamber is provided with the entrance of the film air and peripheral air chamber, the dense-phase pulverized coal deflector is fixed in the middle of the secondary chamber shell of the burner, and the second burner adjacent to the outlet of the dense-phase pulverized coal deflector The secondary chamber of the burner is formed in the secondary chamber shell, and the primary chamber of the burner is formed in the secondary chamber shell of the burner under the dense-phase pulverized coal guide plate, and the dense-phase pulverized coal rectification block is fixed at the entrance of the secondary chamber shell of the burner At the bottom of one side, the main oil gun chamber is fixed on the lower side of the secondary chamber casing of the burner and communicates with the primary chamber of the burner. The beneficial effect of the utility model is that the utility model can be used not only as an ignition burner of a pulverized coal boiler in a power station, but also as a main burner. When operating as the main burner, it can be operated as a horizontal rich-lean burner, which can not only realize the function of the horizontal rich-lean burner to reduce the emission of pollutants such as boiler NOx, but also realize the function of the horizontal rich-lean burner to stabilize combustion at low load. The fuel-saving rate is improved. Due to the high concentration ratio of the horizontal thick-lean burner, the ignition point of high-concentration pulverized coal is greatly reduced, and the ignition energy required for this part of pulverized coal to be ignited after entering the primary chamber of the burner is also greatly reduced, which greatly reduces the fuel consumption of the oil gun. The output, thus improving the fuel saving rate during the boiler ignition start. The influence on the aerodynamic field of the boiler is greatly reduced. The difference between the burner designed by the utility model and the original design of the boiler is very small, which basically guarantees the flow characteristics of the primary air in the burner, so the influence on the aerodynamic field of the boiler can be greatly reduced. . The primary chamber of the burner has simple structure, convenient maintenance and overhaul, and low cost. When the dense phase pulverized coal deflector is worn out, it can be replaced directly in the burner without replacing the entire burner. The resistance of the burner is smaller. Due to the simple structure, there is no cut-off part in the burner, which has little disturbance to the air flow in the burner, so its resistance is greatly reduced. Coking inside the burner can be prevented due to the film wind and the peripheral wind.

Description of drawings

Fig. 1 is a sectional view of the overall structure of the utility model, Fig. 2 is a schematic diagram of the overall structure of the utility model, and Fig. 3 is a schematic diagram of the outlet structure of the utility model.

Detailed ways

Specific embodiment one: (refer to Fig. 1～Fig. 3) this embodiment consists of dense phase pulverized coal rectification block 1, gas film wind and perimeter wind chamber 2, main oil gun chamber 3, perimeter wind housing 5, burner inner nozzle 7. Composed of burner outer nozzle 8, dense phase pulverized coal guide plate 10 and burner secondary chamber housing 13, the cross-section of burner inner nozzle 7, burner outer nozzle 8 and burner secondary chamber housing 13 They are all square, the inlet end of the burner inner nozzle 7 is connected to the outlet end of the burner secondary chamber casing 13, the perimeter air casing 5 is set outside the front section of the burner secondary chamber casing 13, and the burner outer nozzle 8 It is fixed on the outside of the burner inner nozzle 7, and the inlet end of the burner outer nozzle 8 is fixedly connected with the outlet end of the peripheral wind housing 5, and the gas film wind and the peripheral wind are formed between the peripheral wind housing 5 and the burner secondary chamber housing 13. Passage 14, a peripheral wind channel 15 is formed between the burner outer nozzle 8 and the burner inner nozzle 7, and a gas film wind inlet 6 is provided between the burner secondary chamber shell 13 and the burner inner nozzle 7, and the gas film wind and The perimeter wind chamber 2 is fixed on the outside of the burner secondary chamber housing 13 on the inlet end side of the perimeter wind housing 5, and the air film wind and the perimeter wind chamber 2 communicate with the perimeter wind housing 5, and the air film wind and the perimeter wind chamber 2 The bottom side of the chamber is provided with an inlet 12 for air film wind and peripheral air chamber, and the dense-phase pulverized coal deflector 10 is fixed in the middle of the secondary chamber shell 13 of the burner, adjacent to the outlet end of the dense-phase pulverized coal deflector 10 The burner secondary chamber housing 13 forms the burner secondary chamber 9, and the burner secondary chamber housing 13 on the lower side of the dense-phase pulverized coal deflector 10 forms the burner primary chamber 11, and the dense-phase pulverized coal rectification The block 1 is fixed on the bottom of the inlet side of the burner secondary chamber casing 13, and the main oil gun chamber 3 is fixed on the lower side of the burner secondary chamber casing 13 and communicates with the burner primary chamber 11.

Specific embodiment two: (see Fig. 1～Fig. 3) the difference between this embodiment and specific embodiment one is that it has increased auxiliary oil gun casing 4, and auxiliary oil gun casing 4 is fixed in main oil gun chamber 3 The lower side of the burner secondary chamber casing 13 on the outlet side is in communication with the burner primary chamber 11 . The added auxiliary oil gun bushing 4 can make the primary chamber 11 of the burner provide auxiliary flame according to the different types of coal. Other compositions and connections are the same as in the first embodiment.

Embodiment 3: (see FIG. 1 ) In this embodiment, the included angle a between the dense-phase pulverized coal guide plate 10 and the horizontal plane of the secondary chamber housing 13 of the burner is 2-7°. Other compositions and connections are the same as those in the second embodiment.

Embodiment 4: (See FIG. 1 ) In this embodiment, the included angle b between the main oil gun chamber 3 and the horizontal plane of the burner secondary chamber housing 13 is 45° to 63°. Other compositions and connections are the same as those in the third embodiment.

Embodiment 5: (See FIG. 1 ) In this embodiment, the included angle c between the auxiliary oil gun bushing 4 and the horizontal plane of the burner secondary chamber housing 13 is 45° to 63°. Other compositions and connections are the same as in Embodiment 4.

Embodiment 6: (See FIG. 1 ) In this embodiment, the width L1 of the peripheral air channel 15 between the burner outer nozzle 8 and the burner inner nozzle 7 is 0-30 mm. Other compositions and connections are the same as those in Embodiment 5.

Embodiment 7: (See FIG. 1 ) In this embodiment, the distance L2 from the gas film air inlet 6 to the outer edge of the burner inner nozzle 7 is 0-450mm. Other compositions and connections are the same as those in Embodiment 6.

Embodiment 8: (See FIG. 1 ) In this embodiment, the distance L3 from the outlet of the primary chamber 11 of the burner to the outer edge of the nozzle 7 in the burner is 0-1000 mm. Other compositions and connections are the same as those in Embodiment 7.

Working principle: The dense-phase pulverized coal after passing through the horizontal thick-lean concentrator is rectified by the dense-phase pulverized coal rectification block 1, and then enters the chamber formed by the dense-phase pulverized coal deflector 10 and the side wall of the burner, and part of it enters the chamber The primary chamber 11 of the burner meets the flame of the main oil gun from the main oil gun chamber 3 and the auxiliary oil gun flame from the auxiliary oil gun casing 4 (providing auxiliary flame according to the different types of coal). The primary chamber 11 of the burner is ignited and burned, and its flame enters the secondary chamber 9 of the burner, ignites and partially burns the dense-phase pulverized coal and dilute-phase pulverized coal entering the secondary chamber 9 of the burner, and the heat generated by the combustion Heat the pulverized coal in all burners above the ignition point. When the pulverized coal enters the furnace, it will burn rapidly when it encounters oxygen, forming a pulverized coal flame flow with strong self-stable combustion ability, so as to replace the large oil gun to realize the ignition of the boiler and achieve Use coal instead of oil to achieve the goal of saving fuel. In order to prevent the burner from burning out, the size of the side passages of the peripheral air and whether to increase the film cooling air are determined according to the type of coal burned by the boiler. The film cooling air enters through the air film air inlet 6. The perimeter wind channel is composed of the perimeter wind housing 5 and the burner secondary chamber housing 13. The film wind and the perimeter wind come from the secondary air of the boiler, and enter the film wind and the perimeter wind chamber 2 through the entrance 12 of the film wind and the perimeter wind chamber. Distribute through air film wind and perimeter wind chamber 2 again. Since the nozzle of the burner is under high temperature radiation, in order to ensure the stable operation of the burner, the outlet of the burner is equipped with a high temperature resistant burner inner nozzle 7 and a burner outer nozzle 8 .

Claims (8)

1. little oil mass igniting pulverized coal burner of horizontal bias type, it comprises dense phase pulverized coal rectifying block (1), air film wind and surrounding air air compartment (2), main oil gun chamber (3), surrounding air housing (5), spout (7) in the burner, the outer spout (8) of burner, dense phase pulverized coal deflector (10) and burner secondary chamber housing (13), it is characterized in that spout (7) in the burner, the cross section of outer spout (8) of burner and burner secondary chamber housing (13) is all square, the port of export of spout (7) entrance point and burner secondary chamber housing (13) joins in the burner, surrounding air housing (5) is set in the outside of burner secondary chamber housing (13) leading portion, the outer spout (8) of burner is fixed on the outside of spout (7) in the burner, the entrance point of the outer spout (8) of burner is fixedlyed connected with the port of export of surrounding air housing (5), form air film wind and surrounding air passage (14) between surrounding air housing (5) and the burner secondary chamber housing (13), form surrounding air passage (15) between the spout (7) in outer spout (8) of burner and the burner, be provided with air film wind introducing port (6) between the spout (7) in burner secondary chamber housing (13) and the burner, air film wind and surrounding air air compartment (2) are fixed on the outside of the burner secondary chamber housing (13) of surrounding air housing (5) entrance point one side, air film wind and surrounding air air compartment (2) are communicated with surrounding air housing (5) is interior, the bottom side of air film wind and surrounding air air compartment (2) is provided with air film wind and surrounding air air compartment inlet (12), dense phase pulverized coal deflector (10) is fixed on the middle part in the burner secondary chamber housing (13), form burner secondary chamber (9) in the burner secondary chamber housing (13) adjacent with dense phase pulverized coal deflector (10) port of export, form a chamber of burner (11) in the burner secondary chamber housing (13) of dense phase pulverized coal deflector (10) downside, dense phase pulverized coal rectifying block (1) is fixed on the bottom in burner secondary chamber housing (13) import one side, and main oil gun chamber (3) is fixed on the downside of burner secondary chamber housing (13) and is connected with a chamber of burner (11).

2. the little oil mass igniting pulverized coal burner of horizontal bias type according to claim 1, it is characterized in that it also comprises auxiliary oil gun sleeve pipe (4), auxiliary oil gun sleeve pipe (4) be fixed on main oil gun chamber (3) port of export one side burner secondary chamber housing (13) downside and be connected with a chamber of burner (11).

3. the little oil mass igniting pulverized coal burner of horizontal bias type according to claim 2 is characterized in that the angle (a) between the horizontal plane of dense phase pulverized coal deflector (10) and burner secondary chamber housing (13) is 2～7 °.

4. the little oil mass igniting pulverized coal burner of horizontal bias type according to claim 3 is characterized in that the angle (b) between the horizontal plane of main oil gun chamber (3) and burner secondary chamber housing (13) is 45～63 °.

5. the little oil mass igniting pulverized coal burner of horizontal bias type according to claim 4 is characterized in that the angle (c) between the horizontal plane of auxiliary oil gun sleeve pipe (4) and burner secondary chamber housing (13) is 45～63 °.

6. the little oil mass igniting pulverized coal burner of horizontal bias type according to claim 5 is characterized in that the width (L1) of the surrounding air passage (15) between the spout (7) in outer spout (8) of burner and the burner is 0～30mm.

7. the little oil mass igniting pulverized coal burner of horizontal bias type according to claim 6 is characterized in that air film wind introducing port (6) distance (L2) of spout (7) outer to the burner is 0～450mm.

8. the little oil mass igniting pulverized coal burner of horizontal bias type according to claim 7 is characterized in that the distance (L3) that is exported to spout (7) outer in the burner of a chamber of burner (11) is 0～1000mm.

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