CN217584437U

CN217584437U - Low-nitrogen burner injected by central premixed gas

Info

Publication number: CN217584437U
Application number: CN202221542586.0U
Authority: CN
Inventors: 刘永才; 王绥德; 张龙; 黄世峰; 高鲁斌
Original assignee: Shenzhen Jiayuntong Electronics Co Ltd
Current assignee: Shenzhen Jiayuntong Electronics Co Ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-10-14
Anticipated expiration: 2032-06-20

Abstract

The utility model provides a center mixes low NOx burner that gas jetted in advance, include: the gas guide cylinder is arranged in the gas guide cylinder; the air channel is arranged on the outer side of the air guide cylinder, a gas annular cavity is sleeved on the outer side of the air channel and is connected with the outer side shell of the air channel in a sealing mode, an air expansion section is arranged at the front end of the air channel, and the air expansion section is enclosed outside the premixing development section. On one hand, the utility model enhances the mixing of air and fuel gas, so that the mixing is more uniform, and the combustion efficiency is improved; on the other hand, peripheral gas fuel high-speed injection is added, so that downstream smoke gas backflow is mixed with the gas fuel, the flame temperature is reduced, and the generation of oxynitride is reduced; meanwhile, after the central gas fuel and the air are fully mixed to form premixed gas, the premixed gas is sprayed out from the central gas nozzle to form premixed flame, and the generation of nitrogen oxides is reduced.

Description

Low-nitrogen burner with central premixed gas injection

Technical Field

The utility model relates to a low NOx burner technical field, concretely relates to center mixes low NOx burner that gas jetted in advance.

Background

Environmental problems are also getting more serious with the development of society, and are receiving attention from both domestic and foreign society. In China, the problem of environmental pollution is increasingly aggravated, the frequency of atmospheric pollution is increased continuously, the national standard for environmental protection is also improved continuously, some original combustion technologies cannot meet the national standard, and the combustion technology and the design level need to be further improved to control the emission of the combustor.

However, some combustors in the prior art adopt a staged combustion technology, but the air-fuel ratio is not reasonably designed, so that local high temperature or insufficient combustion is caused, unstable combustion is caused in severe cases, and the emission of pollutants is relatively high.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the low-nitrogen combustor with the center premixed gas injection is provided so as to solve the problems that some combustors in the prior art adopt a staged combustion technology, but the air-fuel ratio is not reasonably designed, so that local high temperature or insufficient combustion is caused, the combustion is unstable in serious conditions, and the emission of pollutants is relatively high.

In order to achieve the above object, a low-nitrogen burner with a center premixed gas injection is provided, which comprises: the gas guide cylinder is arranged in the gas guide cylinder; the air channel is arranged on the outer side of the air guide cylinder, a gas annular cavity is sleeved on the outer side of the air channel and is connected with the outer side shell of the air channel in a sealing mode, an air expansion section is arranged at the front end of the air channel, and the air expansion section is enclosed outside the premixing development section.

Furthermore, the air guide cylinder is sequentially coaxially connected with the premixing contraction section and the premixing development section, a swirler shaft sleeve is installed in the air guide cylinder, a plurality of groups of swirler vanes and gas mixing branch pipes are uniformly distributed on the swirler shaft sleeve, the number of the swirler vanes is 6-12, and the swirl angle of the swirler vanes is set to be 20-60 degrees.

Furthermore, a plurality of groups of gas branch pipe jet holes are uniformly distributed on the part of the gas mixing branch pipe in the air guide cylinder.

Furthermore, the gas ring cavity is connected with a gas inlet pipe, a gas mixing branch pipe and peripheral gas branch pipes, the front ends of the peripheral gas branch pipes are provided with peripheral gas fuel ejectors, and 6-20 peripheral gas branch pipes are arranged.

Furthermore, a premixing outlet end cover is arranged at the front end of the premixing development section, a plurality of groups of premixing inclined injection branch pipes are annularly arranged on the outer annular surface of the premixing outlet end cover, and a plurality of groups of premixing axial injection holes are formed in the front side surface of the premixing outlet end cover.

Furthermore, 4-10 premixing inclined injection branch pipes are arranged on the outer annular surface of the premixing outlet end cover in a surrounding manner, and 6-20 premixing axial injection holes are arranged on the front side surface of the premixing outlet end cover.

The beneficial effects of the utility model reside in that:

1. the utility model discloses well air passage is used for the passageway that the air current flows through, guides the air to boiler furnace, and the gas intake pipe is used for the passageway that the gas got into the combustor, guides the gas to boiler furnace.

2. In the utility model, air enters the burner through the air channel and is divided into two parts after flowing through the air guide cylinder, and one part of air flows between the air channel and the air guide cylinder to form peripheral air; the other part of air flows into the air guide cylinder and flows through the blades of the swirler to form swirling internal premixed air;

3. the mixing of fuel gas, air and flue gas is promoted, so that the combustion is more sufficient, the temperature of flame is reduced due to the mixing of low-temperature flue gas, and NOx is reduced; and the redundant peripheral air is used for forming a certain division between the central premixed flame area and the peripheral diffusion flame, so that the grading effect is increased, and the flame temperature and NOx are further reduced.

4. Each combustion area is subjected to rotational flow to generate mixing effect and shearing effect, intense substance and heat transfer is carried out, and stable and efficient combustion areas are formed together.

Drawings

Fig. 1 is a diagram showing the expansion effect of the internal structure of the embodiment of the present invention;

fig. 2 is a schematic front view of an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of an embodiment of the present invention.

In the figure: 1. an air passage; 2. a gas inlet pipe; 3. an air expansion section; 4. a gas ring cavity; 5. an air guide cylinder; 6. a peripheral gas branch pipe; 7. a peripheral gaseous fuel injector; 8. a swirler shaft sleeve; 9. swirler vanes; 10. a gas mixing branch pipe; 11. a gas branch pipe jet hole; 12. a pre-mixing contraction section; 13. a premix development stage; 14. premixing the inclined injection branch pipe; 15. a premix outlet end cap; 16. the premix axial injection holes.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

Fig. 1 is an internal structure development effect diagram of an embodiment of the present invention, fig. 2 is a front view schematic diagram of an embodiment of the present invention and fig. 3 is a sectional structure schematic diagram of an embodiment of the present invention.

Referring to fig. 1 to 3, the utility model provides a center mixes low NOx burner that gas injection in advance, include: the gas-water separator comprises an air channel 1, a gas ring cavity 4 and an air guide cylinder 5; air passage 1 sets up in the outside of air draft tube 5, and the gas ring chamber 4 has been put to air passage 1's outside cover to gas ring chamber 4 is in the same place with air passage 1's outside casing sealing connection, and air passage 1's front end is provided with air expansion section 3, and air expansion section 3 encloses and closes outside premixing development section 13.

As a preferred embodiment, the utility model discloses well air duct 1 is used for the passageway that the air flowed through, leads the air to boiler furnace, and gas intake pipe 2 is used for the passageway that the gas got into the combustor, leads the gas to boiler furnace.

In this embodiment, the air guide cylinder 5 is sequentially coaxially connected with the premixing contraction section 12 and the premixing development section 13, a swirler shaft sleeve 8 is installed in the air guide cylinder 5, a plurality of groups of swirler vanes 9 and gas mixing branch pipes 10 are uniformly distributed on the swirler shaft sleeve 8, meanwhile, 6-12 swirler vanes 9 are arranged, and the swirl angle of the swirler vanes 9 is set to be 20-60 degrees; the gas mixing branch pipe 10 is provided with a plurality of groups of gas branch pipe jet holes 11 on the part inside the air guide cylinder 5.

As a better implementation mode, the air in the utility model enters the burner from the air channel 1, and is divided into two parts after flowing through the air guide cylinder 5, and one part of the air flows between the air channel 1 and the air guide cylinder 5 to form peripheral air; the other part of air flows into the air guide cylinder 5 and forms rotational flow internal premixed air after flowing through the swirler vanes 9;

in the embodiment, the gas ring cavity 4 is connected with a gas inlet pipe 2, a gas mixing branch pipe 10 and a peripheral gas branch pipe 6, a peripheral gas fuel ejector 7 is arranged at the front end of the peripheral gas branch pipe 6, and 6-20 peripheral gas branch pipes 6 are arranged; a premixing outlet end cover 15 is arranged at the front end of the premixing development section 13, a plurality of groups of premixing inclined injection branch pipes 14 are annularly arranged on the outer annular surface of the premixing outlet end cover 15, and a plurality of groups of premixing axial injection holes 16 are arranged on the front side surface of the premixing outlet end cover 15; 4-10 premixing inclined injection branch pipes 14 are arranged on the outer annular surface of the premixing outlet end cover 15 in a surrounding mode, and 6-20 premixing axial injection holes 16 are arranged on the front side surface of the premixing outlet end cover 15 in a surrounding mode.

As a preferred embodiment, the fuel gas flows into the fuel gas inlet pipe 2 and then enters the fuel gas annular cavity 4, and is divided into two parts; the first part of gas is sprayed out through a gas branch pipe jet hole 11 on a gas mixing branch pipe 10 and is fully mixed with the premixed air in the rotational flow to form premixed air, the premixed air flows through a premixed contraction section 12 to be further mixed and accelerated, then enters a premixed development section 13 to be fully developed, and is sprayed out from a premixed inclined jet branch pipe 14 and a premixed axial jet hole 16 to form central premixed flame, the air amount in the area is large, oxygen-enriched combustion is formed, and due to the action of premixed combustion, a low-nitrogen oxygen-enriched combustion atmosphere is formed in the central area; the second part of fuel gas is ejected at high speed through the peripheral fuel gas branch pipe 6 and flows into the peripheral gas fuel ejector 7, and after being mixed with part of peripheral air, the second part of fuel gas develops downstream to form a peripheral diffusion flame area, and as the fuel gas flows in the peripheral gas fuel ejector 7 to form negative pressure, the air and the flue gas are refluxed and sucked and mixed with the second part of fuel gas, so that the mixing of the fuel gas, the air and the flue gas is promoted, the combustion is more sufficient, the flame temperature is reduced due to the mixing of the low-temperature flue gas, and the NOx is reduced; and the redundant peripheral air is used for forming a certain division between the central premixed flame area and the peripheral diffusion flame, so that the grading effect is increased, and the flame temperature and NOx are further reduced.

Meanwhile, each combustion area is subjected to the swirling flow to generate a mixing effect and a shearing effect, severe substance and heat transfer is carried out, and a stable and efficient combustion area is formed together.

The utility model discloses some combustors that can effectively solve prior art have adopted the staged combustion technique, but air fuel ratio does not have reasonable design, has leaded to local high temperature or burning insufficient, can lead to the burning unstability in serious time, the relatively higher problem of emission of pollutant, the utility model discloses an aspect strengthens the mixing of air and gas, makes the mixing more even, improves combustion efficiency; on the other hand, peripheral gas fuel high-speed injection is added, so that downstream smoke gas backflow is mixed with the gas fuel, the flame temperature is reduced, and the generation of nitrogen oxides is reduced; meanwhile, after the central gas fuel and the air are fully mixed to form premixed gas, the premixed gas is sprayed out from the central gas nozzle to form premixed flame, and the generation of nitrogen oxides is reduced.

Claims

1. The utility model provides a low NOx burner that center premix gas was drawn and is penetrated which characterized in that includes: the gas burner comprises an air channel (1), a gas ring cavity (4) and an air guide cylinder (5); air duct (1) sets up in the outside of air draft tube (5), and the outside cover of air duct (1) has put gas ring chamber (4) to gas ring chamber (4) are in the same place with the outside casing sealing connection of air duct (1), the front end of air duct (1) is provided with air expansion section (3), and air expansion section (3) enclose to close outside premixing development section (13).

2. The low-nitrogen combustor with the central premixed gas injection function as claimed in claim 1, wherein the air guide cylinder (5) is sequentially and coaxially connected with the premixing contraction section (12) and the premixing development section (13), a swirler shaft sleeve (8) is installed in the air guide cylinder (5), a plurality of sets of swirler vanes (9) and gas mixing branch pipes (10) are uniformly distributed on the swirler shaft sleeve (8), 6-12 swirler vanes (9) are provided, and the swirl angle of the swirler vanes (9) is set to be 20-60 degrees.

3. The low-nitrogen burner injected by the central premixed gas as claimed in claim 2, wherein a plurality of groups of gas branch injection holes (11) are uniformly distributed on the part of the gas mixing branch pipe (10) in the air guide cylinder (5).

4. The low-nitrogen burner with the central premixed gas injection function according to claim 1, wherein the gas ring cavity (4) is connected with a gas inlet pipe (2), a gas mixing branch pipe (10) and peripheral gas branch pipes (6), the peripheral gas fuel injectors (7) are arranged at the front ends of the peripheral gas branch pipes (6), and 6-20 peripheral gas branch pipes (6) are arranged.

5. The low-nitrogen burner injected by central premixed gas as claimed in claim 1, wherein a premixed outlet end cover (15) is arranged at the front end of the premixed development section (13), a plurality of groups of premixed inclined injection branch pipes (14) are annularly arranged on the outer annular surface of the premixed outlet end cover (15), and a plurality of groups of premixed axial injection holes (16) are arranged on the front side surface of the premixed outlet end cover (15).

6. The burner of claim 5, wherein 4-10 premixing inclined injection branch pipes (14) are arranged on the outer annular surface of the premixing outlet end cover (15) in a surrounding manner, and 6-20 premixing axial injection holes (16) are arranged on the front side surface of the premixing outlet end cover (15).