CN218379390U

CN218379390U - Cyclone burner for mixed combustion of ammonia and coal

Info

Publication number: CN218379390U
Application number: CN202220947162.6U
Authority: CN
Inventors: 谢佳; 杨章宁; 冉燊铭; 莫春鸿
Original assignee: Dongfang Boiler Group Co Ltd
Current assignee: Dongfang Boiler Group Co Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2023-01-24
Anticipated expiration: 2032-04-22

Abstract

The application provides a cyclone burner for mixed combustion of ammonia and coal, which comprises an air inlet shell, an ammonia gas gun, an igniter and a combustion stabilizer; the air inlet casing includes central tuber pipe, the first air pipe that sets gradually from inside to outside, interior secondary air pipe and outer secondary air pipe, is equipped with interior axial whirl blade in the interior secondary air pipe, and outer secondary air pipe is equipped with outer tangential whirl blade, and the ammonia air gun inserts and extends to the front end of central tuber pipe by the rear end of central tuber pipe, and the steady burning ware is installed in central tuber pipe front end, and some firearm inserts and extends to in the steady burning ware by central tuber pipe rear end. The utility model discloses can utilize clean renewable energy to realize that the safety and stability burning and nitrogen oxide discharge are controllable.

Description

Cyclone burner for mixed combustion of ammonia and coal

Technical Field

The application relates to the technical field of boiler burners, in particular to a cyclone burner for mixed combustion of ammonia and coal.

Background

The pulverized coal burner is widely applied to a power station boiler and is core equipment of a combustion system.

In recent years, the world energy consumption is increasing, and the consumption of fossil fuels is accompanied by a series of environmental problems while bringing social and economic benefits. Therefore, development of new fuels and combustion technologies thereof to replace fossil fuels has become urgent. The development and utilization of the high-efficiency low-pollution multi-fuel combustion technology can effectively solve the environmental problems of fossil energy shortage, greenhouse effect and the like, and has important significance for social sustainable development. Ammonia is a carbon-free fuel, has high energy density, is easy to liquefy, and is a promising hydrogen energy carrier and storage medium. It can be made from water and nitrogen readily available in the environment, while the products of combustion can recover the same amount of water and nitrogen, a clean renewable alternative fuel. Ammonia can be stored in liquid form at room temperature and 0.8MPa, and its cost per unit of stored energy is only one third of that of hydrogen. The existing mature ammonia production process and the existing transportation technology can reduce the investment cost to a great extent, thereby improving the competitiveness of ammonia as a substitute for fossil fuel.

Therefore, how to apply ammonia to the burner of the utility boiler to realize safe and stable combustion and controllable emission of nitrogen oxides is a technical problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a cyclone burner of ammonia coal co-combustion, it utilizes clean renewable energy to realize safe and stable burning and nitrogen oxide discharges controllably.

The embodiment of the application is realized as follows:

a cyclone burner for mixed combustion of ammonia and coal comprises an air inlet shell, an ammonia gas gun, an igniter and a combustion stabilizer; the air inlet casing includes central tuber pipe, the first air pipe that sets gradually from inside to outside, interior secondary air pipe and outer secondary air pipe, is equipped with interior axial whirl blade in the interior secondary air pipe, and outer secondary air pipe is equipped with outer tangential whirl blade, and the ammonia air gun inserts and extends to the front end of central tuber pipe by the rear end of central tuber pipe, and the steady burner is installed in central tuber pipe front end, and some firearm inserts and extends to in the steady burner by central tuber pipe rear end.

Furthermore, the inner secondary air pipe and the outer secondary air pipe are both provided with air inlet adjusting baffles, the central air pipe is provided with a central air flow valve, and the ammonia gas gun is provided with an ammonia gas flow valve.

Furthermore, a thermocouple is arranged at the front end of the cyclone burner.

Furthermore, a pulverized coal concentrator is arranged in the primary air pipe, and the central air pipe is sleeved with the pulverized coal concentrator.

Furthermore, the ammonia-coal co-combustion cyclone burner also comprises an oil gun, and the oil gun is inserted from the rear end of the central air pipe and extends into the combustion stabilizer.

Further, the number of ammonia gas guns was 2 or more.

Compared with the prior art, the embodiment of the application has at least the following advantages or beneficial effects:

the utility model discloses ammonia coal burns with mixture's cyclone burner, ammonia get into ammonia air gun, and the air-powder mixture of once gets into the air duct of once, through setting up the steady burner at central tuber pipe front end, set up the whirl blade in inner secondary tuber pipe and outer secondary tuber pipe, adopt the mode of whirl successfully to stabilize NH3 air flame for nitrogen oxide discharges controllably; the ammonia gas gun is inserted from the rear end of the central air pipe and extends to the front end of the central air pipe, ammonia gas is sprayed into the hearth from the flame central area, and the emission of nitrogen oxides is relatively low and even lower than that of pulverized coal during independent combustion because the flame area is in the NH3 rich combustion condition; NH3 is sprayed into the high-temperature flame zone, so that the NH3 is decomposed and converted into nitrogen oxides before the coke is oxidized, and the nitrogen oxides can be reduced by the coke again, so that the emission of the nitrogen oxides is further controlled.

Through setting up air inlet damper, central wind flow valve, ammonia flow valve, thermocouple, can detect the regional temperature of flame, accurate control flow valve and air inlet damper to the heat ratio of control equivalence ratio, buggy and NH3 multifuel combustion controls the nitrogen oxide emission.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a cyclone burner for ammonia-coal co-combustion provided in an embodiment of the present application;

fig. 2 is an enlarged view of a in fig. 1.

An icon: 1-air inlet shell, 11-central air pipe, 111-central air flow valve, 12-primary air pipe, 13-inner secondary air pipe, 131-inner axial rotational flow blade, 14-outer secondary air pipe, 141-outer external rotational flow blade, 2-ammonia air gun, 3-igniter, 4-flame stabilizer, 5-air inlet adjusting baffle, 6-thermocouple, 7-pulverized coal concentrator, 8-oil gun and 9-secondary air box.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Examples

Referring to fig. 1, the present embodiment provides an ammonia-coal co-combustion cyclone burner, which includes an air inlet housing 1, an ammonia gas gun 2, an igniter 3, and a combustion stabilizer 4. The air inlet shell 1 comprises a central air pipe 11, a primary air pipe 12, an inner secondary air pipe 13 and an outer secondary air pipe 14 which are arranged from inside to outside in sequence, and the inner secondary air pipe 13 and the outer secondary air pipe 14 are supplied with air by a secondary air box 9. A pulverized coal concentrator 7 is arranged in the primary air pipe 12, the central air pipe 11 is sleeved with the pulverized coal concentrator 7, and the pulverized coal concentrator 7 is of a blunt body structure. An inner axial swirl vane 131 is arranged in the inner secondary air pipe 13, and an outer tangential swirl vane 141 is arranged in the outer secondary air pipe 14. The ammonia gas gun 2 is inserted from the rear end of the central air pipe 11 and extends to the front end of the central air pipe 11, the combustion stabilizer 4 is arranged at the front end of the central air pipe 11, and the igniter 3 is inserted from the rear end of the central air pipe 11 and extends into the combustion stabilizer 4.

The utility model discloses during the use, ammonia gets into ammonia air gun 2, and the air-powder mixture gets into air hose 12 once, and central tuber pipe 11 and big bellows are connected and are got the wind, and interior overgrate air and outer overgrate air are combustion-supporting wind. When ammonia air gun 2 throws, the ammonia reaches central tuber pipe 11 front end and burns in flame stabilizer 4 through ammonia air gun 2, flame stabilizer 4 plays the whirl effect and can stabilize NH3 air flame, the buggy is lighted in flame will the tuber pipe 12 once, realize the fractional combustion, tuber pipe 12 has set up buggy concentrator 7 in this embodiment, when the wind powder mixture passes through buggy concentrator 7, can reach the effect of shade separation, thereby further realize the fractional combustion, it is very favorable to reducing nitrogen oxide and discharging, interior overgrate air and the rotatory furnace that gets into of outer overgrate air, stabilize NH3 buggy and burn the flame, make nitrogen oxide discharge controllable. By adopting the cyclone burner, ammonia gas is sprayed into a hearth from a flame center area, and the emission of nitrogen oxides is relatively low even lower than that of pulverized coal during independent combustion because a flame area is in the NH3 rich combustion condition; NH3 is sprayed into the high-temperature flame zone, so that the NH3 is decomposed and converted into nitrogen oxides before the coke is oxidized, and the nitrogen oxides can be reduced by the coke again, so that the emission of the nitrogen oxides is further controlled. When the ammonia gas is not in operation, the central air can be used for adjusting the shape and ignition point of the coal flame and also used for cooling.

In this embodiment, 2 quantity of ammonia gas guns are 2 the utility model discloses an in other embodiments, can adopt 1 or many ammonia gas guns 2 according to fuel volume. In this embodiment, the cyclone burner is further provided with an oil gun 8, the oil gun 8 is inserted from the rear end of the central air pipe 11 and extends into the combustion stabilizer 4, the igniter 3 ignites the oil gun 8 when the oil gun is put into use, and the oil gun 8 ignites the pulverized coal and the ammonia gas again, so that the process of small ignition and large ignition is realized, and the oil saving rate is improved. In other embodiments of the present invention, the oil gun 8 may not be configured (for example, other technologies such as plasma ignition are adopted) according to actual conditions, and the implementation of the functions of the present invention is not affected.

In this embodiment, the inner secondary air duct 13 and the outer secondary air duct 14 are both provided with an air inlet adjusting baffle 5, the adjustment of the air inlet amount can be realized by stirring the air inlet adjusting baffle 5, the central air duct 11 is provided with a central air flow valve 111, the ammonia gas gun is provided with an ammonia gas flow valve (not shown), the front end of the cyclone burner is provided with a thermocouple 6 (in this embodiment, the thermocouple 6 is arranged at the flaring outlet of the burner and the front end of the central air duct 11), and the thermocouple 6 can detect the real-time combustion temperature of flame. Through setting up air inlet damper 5, central wind flow valve 111, ammonia flow valve, ammonia flow, central wind, primary air and overgrate air flow are controlled accurately to control equivalence ratio, the heat ratio of buggy and NH3 multifuel combustion, finally control the nitrogen oxide emission. Research proves that when the equivalent ratio of NH 3/air flame is 1.05-1.1, the control effect of the discharge amount of nitrogen oxides is best, and when pulverized coal and ammonia gas are mixed and burnt at the heat ratio of 3-4, the temperature of the flame area is reduced, so that the generation of thermal nitrogen oxides is reduced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cyclone burner for mixed combustion of ammonia coal is characterized by comprising an air inlet shell (1), an ammonia gas gun (2), an igniter (3) and a flame stabilizer (4); air inlet casing (1) is including central tuber pipe (11), primary air pipe (12), interior secondary air pipe (13) and outer secondary air pipe (14) that set gradually from inside to outside, be equipped with interior axial whirl blade (131) in interior secondary air pipe (13), outer secondary air pipe (14) are equipped with outer tangential whirl blade (141), ammonia air gun (2) by the rear end of central tuber pipe (11) inserts and extends to the front end of central tuber pipe (11), surely fire ware (4) install in central tuber pipe (11) front end, some firearm (3) by central tuber pipe (11) rear end inserts and extends to in surely fire ware (4).

2. The ammonia-coal co-combustion cyclone burner according to claim 1, wherein the inner secondary air duct (13) and the outer secondary air duct (14) are both provided with air inlet adjusting baffles (5), the central air duct (11) is provided with a central air flow valve (111), and the ammonia gas gun (2) is provided with an ammonia gas flow valve.

3. The ammonia-coal co-fired cyclone burner according to claim 2, wherein a thermocouple (6) is further arranged at the front end of the cyclone burner.

4. The cyclone burner for mixed combustion of ammonia and coal according to claim 1, wherein a pulverized coal concentrator (7) is arranged in the primary air pipe (12), and the central air pipe (11) is sleeved with the pulverized coal concentrator (7).

5. The ammonia-coal co-fired cyclone burner according to claim 1, further comprising an oil gun (8), wherein the oil gun (8) is inserted from the rear end of the central air pipe (11) and extends into the flame stabilizer (4).

6. The ammonia-coal co-fired cyclone burner according to any one of claims 1 to 5, wherein the number of the ammonia gas guns (2) is 2 or more.