Combustor capable of reducing NOx generation amount and boiler

Abstract

The burner capable of reducing the NOx generation amount comprises a shell, an ignition device and a flat mouth burner nozzle, the shell is connected with a rear cover and a fire cover, the rear cover and the fire cover are oppositely arranged, a first cavity is defined by the shell, the rear cover and the fire cover, the rear cover is connected with a main gas pipe, and the flat mouth burner nozzle is connected with the ignition device. The fire cover is provided with a center nozzle and a combined nozzle, and the shell is provided with a first air channel communicated with the first cavity. The ignition device is located in the center of the first cavity, connected with the fire cover and communicated with the center nozzle. The flat-mouth burner comprises a flat-mouth main body with a combustion cavity and a cylindrical gas pipeline, the gas pipeline is fixedly connected with the fire cover, the projection of the main body in the longitudinal direction and the projection of a side view are both equilateral trapezoids, the projection of the main body in the longitudinal direction and the inner diameter of the main body are gradually increased in the direction far away from a gas pipe, and the projection of the side view is gradually increased in the direction far away from the gas pipe. The inner diameter of the body is gradually reduced in the direction away from the gas pipe, and a gas inlet is formed in the end, close to the gas pipe, of the combustion cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, and particularly relates to a burner and a boiler capable of reducing the generation amount of NOx. Background Art

[0002] With the increasing environmental protection requirements and the rising energy prices, waste heat boilers burning smelting tail gas are facing the same problems: there is a risk of exceeding the flue gas emission standards, and the operation is uneconomical. Existing enterprises, in response to the environmental protection requirements, basically use air distribution burners combined with clean energy to reduce the pollutant emission concentration. However, it is found in the implementation process that for natural gas to burn stably, its flame must maintain a certain stiffness, but to maintain the stiffness, sufficient secondary air pressure is required, which means that the secondary air must be increased. Since power station boilers are converted from coal-fired boilers to gas-fired boilers, a certain amount of primary air must be maintained, resulting in an oxygen content as high as 14.1%, causing a very high conversion coefficient of flue gas emission indicators, thus leading to the risk of exceeding the NOx emission standard. Content of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a burner capable of reducing the generation amount of NOx. The burner can ensure complete combustion of gas under a smaller excess air coefficient, effectively reduce the chemical combustion heat loss and the exhaust gas heat loss, thereby improving the boiler combustion efficiency and having good environmental protection benefits.

[0004] In a first aspect, a burner capable of reducing the generation amount of NOx according to an embodiment of the utility model includes:

[0005] A housing, the housing is connected with a rear cover and a fire cover, the rear cover and the fire cover are arranged oppositely, a first chamber is enclosed by the housing, the rear cover and the fire cover, the rear cover is connected with a main gas pipe communicating with the first chamber, the fire cover is provided with a central nozzle and a combined nozzle, and the housing is provided with a first air passage communicating with the first chamber;

[0006] An ignition device, located at the center of the first chamber, the ignition device is connected with the fire cover and communicates with the central nozzle;

[0007] A flat nozzle, the flat nozzle includes a flat body having a combustion chamber and a cylindrical gas pipeline, the gas pipeline is fixedly connected with the fire cover, the projection of the body in the longitudinal direction and the projection in the side view are both equilateral trapezoids. In the projection in the longitudinal direction, the inner diameter of the body gradually increases in the direction away from the gas pipe, and in the projection in the side view, the inner diameter of the body gradually decreases in the direction away from the gas pipe. An air inlet is arranged at one end of the combustion chamber close to the gas pipe.

[0008] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model has at least the following beneficial effects: The combined nozzle can supplement oxygen to the flame of the burner. At the same time, by using the high-speed jet of the burner, the flue gas in the combustion area is entrained and recirculated, which can reduce the oxygen concentration in the combustion area. Further, by providing a flat nozzle, the combustion range area is expanded, and then the combustion temperature is reduced, thereby reducing the generation of NOx.

[0009] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, the combined nozzle includes a first nozzle, a second nozzle, a third nozzle and a fourth nozzle communicating with the first chamber, and the first nozzle, the second nozzle, the third nozzle and the fourth nozzle are arranged in sequence from the center to the outer ring of the burner head. When the burner is applied to a boiler, the combined nozzle composed of various different forms of nozzles can use the high-speed jet of the burner to form jets with different angles at the outer side of the burner head to entrain the flue gas in the boiler, so that the flue gas circulates and diffuses in the boiler, which can reduce the oxygen concentration in the combustion area, and then reduce the combustion temperature, thereby reducing the generation of NOx.

[0010] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, both the first nozzle and the second nozzle are in a swirl shape, and the third nozzle and the fourth nozzle are a plurality of circular nozzles evenly arranged in the circumferential direction and inclined towards the direction of the central nozzle. This enables the use of the high-speed jet of the burner to cause the flue gas in the combustion area to be entrained and recirculated, which can reduce the oxygen concentration in the combustion area, expand the combustion area, and then reduce the combustion temperature, thereby reducing the generation of NOx.

[0011] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, the ignition device is a fuel spray gun. The fuel spray gun includes a second chamber, an ignition gas pipe is arranged in the second chamber, the fuel spray gun is provided with an air inlet pipe communicating with the ignition gas pipe, the nozzle of the ignition gas pipe communicates with the central nozzle, and an igniter is arranged in the second chamber, and the ignition electrode of the igniter is arranged at the nozzle of the ignition gas pipe.

[0012] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, the fuel spray gun is installed on the rear cover, the fuel spray gun extends through the first chamber, and the air inlet end of the fuel spray gun is located outside the housing.

[0013] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, a second air passage communicating with the second chamber is provided at the air inlet end of the fuel spray gun, a third spray hole is provided at the spray port end of the fuel spray gun, and a plurality of second through holes communicating with the second chamber are uniformly provided on the outer peripheral wall of the ignition gas pipe. It can be understood that the ignition air enters the second chamber through the second air passage, and the high-speed air flow generated by the high-speed jet of the ignition gas in the ignition gas pipe can bring the ignition air into the ignition gas pipe through the second through holes, so that the ignition gas is mixed with the ignition air to provide oxygen for the combustion of the ignition gas, and the remaining ignition air can be diffused to the center spray port through the third spray hole. The third spray hole is inclined towards the spray port end direction of the ignition gas pipe, which is convenient for the ignition air to supplement subsequent oxygen for the ignition source, and after the ignition gas burns stably at the ignition source, the supply of the ignition gas can be stopped, while the ignition air keeps being supplied, then the ignition air can be used as a part of the combustion-supporting air and can effectively isolate the influence of the high-temperature combustion-supporting air on the fuel spray gun.

[0014] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, the first air passage is connected to the air pipeline and the return air pipeline at the same time, the air pipeline is used for inputting external air, and the return air pipeline is used for connecting the waste gas treatment equipment of the boiler.

[0015] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, an annular fixing plate is provided at one end of the gas pipe facing the burner cap, the annular fixing plate is provided with mounting holes, and a plurality of mounting holes are arranged at intervals around the axis of the gas pipe.

[0016] A burner capable of reducing the generation amount of NOx according to an embodiment of the present utility model, the flame spray port of the main body is rectangular.

[0017] In a second aspect, a boiler according to an embodiment of the present utility model applies the above-mentioned burner capable of reducing the generation amount of NOx.

[0018] A boiler according to an embodiment of the present utility model has at least the following beneficial effects: setting a combined spray port can supplement oxygen to the flame of the burner, and at the same time, using the high-speed jet of the burner to cause the flue gas in the combustion area to be entrained and refluxed, which can reduce the oxygen concentration in the combustion area. Further, by providing a flat nozzle, the combustion range area is expanded, thereby reducing the combustion temperature, and thus reducing the generation of NOx.

[0019] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0020] The following will further describe the present utility model in conjunction with the drawings and embodiments, where:

[0021] Figure 1 Schematic structural diagram of a burner capable of reducing NOx generation amount according to an embodiment of the present invention;

[0022] Figure 2 Partial structural schematic diagram of a fuel spray gun of a burner capable of reducing NOx generation amount according to an embodiment of the present invention;

[0023] Figure 3 Structural sectional view of a burner nozzle of a burner capable of reducing NOx generation amount according to an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of a burner capable of reducing NOx generation amount according to an embodiment of the present invention;

[0025] Figure 5 Structural diagram of a burner nozzle of a burner capable of reducing NOx generation amount according to an embodiment of the present invention;

[0026] Figure 6 Flame effect diagram of a burner capable of reducing NOx generation amount according to an embodiment of the present invention

[0027] Reference numerals: housing 100; first chamber 110; first air passage 120; rear cover 200; main gas pipe 210; fire cap 300; central nozzle 310; first nozzle 320; second nozzle 330; third nozzle 340; fourth nozzle 350; flame detection hole 360; fuel spray gun 500; second chamber 510; ignition gas pipe 520; second through hole 521; intake pipe 530; igniter 540; second air passage 550; third nozzle hole 560; fourth nozzle hole 570; fifth nozzle hole 580; flame detector 590; flat nozzle burner 600; main body 610; combustion chamber 611; gas pipeline 620; annular fixing plate 621; mounting hole 622. Detailed implementation manners

[0028] The following details the embodiments of the present invention. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention.

[0029] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, rear, left, right, etc., refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0030] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If the first and second are described, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0031] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present utility model in combination with the specific content of the technical solution. In the description of the present utility model, the description with reference to terms such as "an embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0032] Refer to Figures 1 to 6, an embodiment of the present utility model provides a burner capable of reducing the generation amount of NOx, which includes a housing 100. The housing 100 is connected with a rear cover 200 and a burner head 300. The rear cover 200 and the burner head 300 are arranged opposite to each other. A first chamber 110 is defined by the housing 100, the rear cover 200 and the burner head 300. The rear cover 200 is connected with a main gas pipe 210 communicating with the first chamber 110. The burner head 300 is provided with a central nozzle 310 and a combined nozzle. The housing 100 is provided with a first air passage 120 communicating with the first chamber 110; an ignition device, located at the center of the first chamber 110, the ignition device is connected with the burner head 300 and communicates with the central nozzle 310; a flat nozzle burner 600, the flat nozzle burner 600 includes a flat nozzle body 610 having a combustion chamber 611 and a cylindrical gas pipeline 620. The gas pipeline 620 is fixedly connected with the burner head 300. The projection of the body 610 in the longitudinal direction and the projection in the side view are both equilateral trapezoids. In the projection in the longitudinal direction, the inner diameter of the body 610 gradually increases in the direction away from the gas pipe. In the projection in the side view, the inner diameter of the body 610 gradually decreases in the direction away from the gas pipe. An air inlet is arranged at one end of the combustion chamber 611 close to the gas pipe.

[0033] In addition, the present application also provides a boiler (not shown in the figure) applying the above burner.

[0034] Setting the combined nozzle can supplement oxygen to the flame of the burner. At the same time, by using the high-speed jet of the burner, the flue gas in the combustion area can be entrained and refluxed, which can reduce the oxygen concentration in the combustion area. Further, by providing the flat nozzle burner 600, the combustion range area is expanded, and then the combustion temperature is reduced, thereby reducing the generation of NOx.

[0035] According to some embodiments of the present application, the combined nozzle includes a first nozzle 320, a second nozzle 330, a third nozzle 340 and a fourth nozzle 350 communicating with the first chamber 110. The first nozzle 320, the second nozzle 330, the third nozzle 340 and the fourth nozzle 350 are arranged in sequence from the center to the outer circle of the burner head 300. When the burner is applied to a boiler, the combined nozzle composed of various different forms of nozzles can use the high-speed jet of the burner to form jets with different angles at the outer side of the burner head 300 to entrain the flue gas in the boiler, so that the flue gas circulates and diffuses in the boiler, which can reduce the oxygen concentration in the combustion area, and then reduce the combustion temperature, thereby reducing the generation of NOx.

[0036] According to some embodiments of the present application, both the first nozzle 320 and the second nozzle 330 are swirl-shaped. The third nozzle 340 and the fourth nozzle 350 are a plurality of circular nozzles arranged circumferentially and inclined towards the direction of the central nozzle 310. This enables the use of the high-speed jet of the burner to cause the flue gas in the combustion area to be entrained and refluxed, which can reduce the oxygen concentration in the combustion area, expand the combustion area, and then reduce the combustion temperature, thereby reducing the generation of NOx.

[0037] According to some embodiments of the present application, the ignition device is a fuel spray gun 500. The fuel spray gun 500 includes a second chamber 510. An ignition gas pipe 520 is arranged in the second chamber 510. The fuel spray gun 500 is provided with an intake pipe 530 communicating with the ignition gas pipe 520. The nozzle of the ignition gas pipe 520 communicates with the central nozzle 310. An igniter 540 is arranged in the second chamber 510, and the ignition electrode of the igniter 540 is arranged at the nozzle of the ignition gas pipe 520.

[0038] According to some embodiments of the present application, the fuel spray gun 500 is installed on the rear cover 200. The fuel spray gun 500 extends through the first chamber 110, and the intake end of the fuel spray gun 500 is located outside the housing 100.

[0039] According to some embodiments of the present application, the intake end of the fuel spray gun 500 is provided with a second air passage 550 communicating with the second chamber 510. The nozzle end of the fuel spray gun 500 is provided with a third spray hole 560. A plurality of second through holes 521 communicating with the second chamber 510 are uniformly arranged on the outer peripheral wall of the ignition gas pipe 520. It can be understood that the ignition air enters the second chamber through the second air passage 550. The high-speed air flow generated by the high-speed injection of the ignition gas in the ignition gas pipe 520 can bring the ignition air into the ignition gas pipe 520 through the second through holes 521, so that the ignition gas is mixed with the ignition air, providing oxygen for the combustion of the ignition gas. The remaining ignition air can be diffused to the central nozzle 310 through the third spray hole 560. The third spray hole 560 is inclined towards the nozzle end of the ignition gas pipe 520, which is convenient for the ignition air to supplement subsequent oxygen for the ignition source. And after the ignition gas burns stably at the ignition source, the supply of the ignition gas can be stopped, while the ignition air keeps being supplied. Then the ignition air can be used as a part of the combustion-supporting air and can effectively isolate the influence of the high-temperature combustion-supporting air on the fuel spray gun 500.

[0040] According to some embodiments of the present application, the first air passage 120 is connected to both an air pipeline and a return pipeline. The air pipeline is used to input external air, and the return pipeline is used to connect to the waste gas treatment equipment of the boiler.

[0041] According to some embodiments of the present application, one end of the gas pipe facing the burner cap 300 is provided with an annular fixing plate 621. The annular fixing plate 621 is provided with mounting holes 622, and a plurality of mounting holes 622 are arranged at intervals around the axis of the gas pipe.

[0042] According to some embodiments of the present application, the flame nozzle of the main body 610 is rectangular.

[0043] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0044] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art to which it pertains.

Claims

1. A burner capable of reducing the generation amount of NOx, characterized in that, Comprising: A housing, the housing is connected with a rear cover and a burner cap, the rear cover and the burner cap are arranged oppositely, a first chamber is defined by the housing, the rear cover and the burner cap, the rear cover is connected with a main gas pipe communicating with the first chamber, the burner cap is provided with a central nozzle and a combined nozzle, and the housing is provided with a first air passage communicating with the first chamber; An ignition device, located at the center of the first chamber, the ignition device is connected with the burner cap and communicates with the central nozzle; A flat nozzle burner, the flat nozzle burner includes a flat nozzle body having a combustion chamber and a cylindrical gas pipe, the gas pipe is fixedly connected with the burner cap, the projection of the body in the longitudinal direction and the projection in the side view are both equilateral trapezoids, in the projection in the longitudinal direction, the inner diameter of the body gradually increases in the direction away from the gas pipe, in the projection in the side view, the inner diameter of the body gradually decreases in the direction away from the gas pipe, and an air inlet is arranged at one end of the combustion chamber close to the gas pipe.

2. The burner capable of reducing the NOx generation amount according to claim 1, wherein The combined nozzle includes a first nozzle, a second nozzle, a third nozzle and a fourth nozzle communicating with the first chamber, and the first nozzle, the second nozzle, the third nozzle and the fourth nozzle are arranged in sequence from the center to the outer ring of the burner cap.

3. The burner capable of reducing the generation amount of NOx according to claim 2, characterized in that, Both the first nozzle and the second nozzle are in a swirl shape, and the third nozzle and the fourth nozzle are a plurality of circular nozzles arranged circumferentially and uniformly and inclined towards the direction of the central nozzle.

4. The burner capable of reducing the amount of NOx generation according to claim 1, wherein The ignition device is a fuel spray gun, the fuel spray gun includes a second chamber, the second chamber is provided with an ignition gas pipe, the fuel spray gun is provided with an air inlet pipe communicating with the ignition gas pipe, the nozzle of the ignition gas pipe communicates with the central nozzle, the second chamber is provided with an igniter, and the ignition electrode of the igniter is arranged at the nozzle of the ignition gas pipe.

5. The burner capable of reducing the generation amount of NOx according to claim 4, characterized in that, The fuel spray gun is installed on the rear cover, the fuel spray gun extends through the first chamber, and the air inlet end of the fuel spray gun is located outside the housing.

6. The burner capable of reducing the generation amount of NOx according to claim 5, characterized in that, The air inlet end of the fuel spray gun is provided with a second air passage communicating with the second chamber, the nozzle end of the fuel spray gun is provided with a third nozzle hole, and a plurality of second through holes communicating with the second chamber are uniformly arranged on the outer peripheral wall of the ignition gas pipe.

7. The burner capable of reducing the generation amount of NOx according to any one of claims 1-6, characterized in that, The first air passage is simultaneously connected with an air pipeline and a return air pipeline, the air pipeline is used for inputting external air, and the return air pipeline is used for connecting the waste gas treatment equipment of the boiler.

8. The burner capable of reducing the generation amount of NOx according to claim 1, wherein One end of the gas pipe facing the burner cap is provided with an annular fixing plate, the annular fixing plate is provided with mounting holes, and a plurality of the mounting holes are arranged at intervals around the axis of the gas pipe.

9. The burner capable of reducing the generation amount of NOx according to claim 1, wherein The flame nozzle of the body is rectangular.

10. A boiler, characterized in that, Comprising a burner capable of reducing the generation amount of NOx according to any one of claims 1 to 9.

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