CN210485720U - Gas low-nitrogen burner - Google Patents
Gas low-nitrogen burner Download PDFInfo
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- CN210485720U CN210485720U CN201920959846.6U CN201920959846U CN210485720U CN 210485720 U CN210485720 U CN 210485720U CN 201920959846 U CN201920959846 U CN 201920959846U CN 210485720 U CN210485720 U CN 210485720U
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Abstract
The utility model discloses a gas low-nitrogen burner, which comprises a gas channel, a combustion-supporting air channel and an air box (11); the gas channels are arranged in three layers, namely a central primary gas channel (2), a secondary gas channel (3) and a tertiary gas channel (4); the combustion-supporting air channel is divided into a central primary air channel (5) and an outer secondary air channel (6); inlets of the combustion-supporting air channels are uniformly distributed in the air box (11); the primary gas channel (2) is located in the central primary air channel (5), the secondary gas channel (3) is located in the secondary air channel (6) and is arranged outside the central primary air channel in a clinging mode, and the tertiary gas channel (4) is located in the secondary air channel (6) and is arranged outside the secondary gas channel (3) in a clinging mode. The flame of this patent combustor can fine adaptation furnace design requirement, makes can be fast even after the gas blowout burn with air mixing, and the temperature field is even in the stove to realize high-efficient burning and low nitrogen oxide emission requirement.
Description
Technical Field
The utility model relates to a low nitrogen burner of gas.
Background
Nitrogen oxides are an important source of pollution to the atmospheric environment, causing acid rain, photochemical smog and haze, and causing serious harm to the ecological environment and human health. With the increasing concern on environmental problems, the emission limit of the nation on boiler atmospheric pollutants is becoming stricter, and DB11/139-2015 emission Standard of boiler atmospheric pollutants in Beijing City requires that the nitrogen oxide emission of a newly-built gas boiler is reduced to 30mg/m after 4 months and 1 days in 20173The DB31/387 of Shanghai city 2018 emission Standard of atmospheric pollutants for boilers stipulates that the emission of nitrogen oxides of newly-built boilers is 50mg/m3The standard limit of (2).
In order to reduce the investment cost and equipment operation and maintenance cost of boiler denitration after combustion and analyze the production mechanism of nitrogen oxide, the requirement of emission reduction at the combustion stage of the boiler can be met through excellent structural design, and the aim of low NOx emission is fulfilled on the basis of ensuring high combustion efficiency.
SUMMERY OF THE UTILITY MODEL
The patent of the utility model provides a novel low nitrogen combustor of efficient gas, the combustor gas divide into the tertiary, and central one-level gas is located central air passageway, and the second grade gas is located the overgrate air passageway and hugs closely central air passageway outside and arranges, and tertiary gas is located the overgrate air passageway and leans on the outside to arrange, and the terminal surface is close to the stove inboard than one-level and second grade gas. The end part of the tertiary gas jet is a wedge-shaped inclined plane, the axes of the jet holes are vertical to the inclined plane, and the axes of all the tertiary gas jet holes are intersected with the central axis of the burner. The outlet of the central primary air channel is provided with swirl blades which do not occupy the whole primary air outlet channel, and the center of the central primary air channel is provided with a direct current channel. The utility model discloses make the quick homogeneous mixing burning of gas and air, have low nitrogen oxide emission performance. Meanwhile, the length and the diameter of the flame can be effectively adjusted, and the flame can be well adapted to matching with a boiler.
The patent of the utility model provides a novel low nitrogen combustor of efficient gas, combustor gas divide into the third grade, and combustion-supporting wind divide into 2 grades, and central one-level gas is located the center and onceIn the wind channel, the second-level fuel gas is arranged in the secondary wind channel and closely attached to the outer side of the central primary wind channel, and the third-level fuel gas is arranged in the secondary wind channel and closely attached to the outer side. The multi-stage distribution and multi-gun injection of fuel and air can make the gas be uniformly mixed and quickly combusted, at the same time can disperse fuel so as to attain the goal of controlling combustion temperature and reducing nitrogen oxide discharge. The outlet of the central primary air channel is provided with swirl blades which do not occupy the whole primary air outlet channel, and the center of the central primary air channel is provided with a direct current channel. The central direct current channel is mainly used for meeting the air distribution requirement of the primary stage of the fuel gas, and ignition and stable combustion at the center of the combustor are guaranteed through stable combustion of the swirl vanes. The end face of the three-stage gas spray gun is inclined to the center, and the spray hole shaft is intersected with the central axis of the burner, so that peripheral gas and rotational flow secondary air can be quickly and uniformly mixed, and the length of a spray hole extending out of the three-stage gas spray gun and the size of an end face oblique angle are changed, so that the purpose of adjusting the flame diameter and the flame length can be achieved. The flame of this patent combustor can fine adaptation furnace design requirement, makes can be fast even after the gas blowout burn with air mixing, and the temperature field is even in the stove to realize high-efficient burning and low nitrogen oxide emission requirement. The nitrogen oxide can be less than 50mg/Nm under the premise of no carbon monoxide3。
Drawings
FIG. 1 is a schematic diagram of a horizontal cross-section of a gas low-nitrogen burner for a boiler;
description of reference numerals:
the device comprises a central ignition device 1, a central primary fuel gas channel 2, a secondary fuel gas channel 3, a tertiary fuel gas channel 4, a central primary air channel 5, a secondary air channel 6, a primary air volume adjusting device 7, a secondary air volume adjusting device 8, a primary air swirl blade 9, a secondary air swirl blade 10 and an air box 11.
Detailed Description
The present invention will be described in further detail with reference to the drawings and the detailed description, but the present invention is not limited to the following examples.
The patent of the utility model provides a novel low nitrogen combustor of efficient gas, the combustor is circular structure, include: the device comprises a central ignition device 1, a primary fuel gas channel 2, a secondary fuel gas channel 3, a tertiary fuel gas channel 4, a central primary air channel 5, a secondary air channel 6, a primary air volume adjusting device 7, a secondary air volume adjusting device 8, a primary air swirl blade 9, a secondary air swirl blade 10 and an air box 11. The gas channel is divided into three levels, the combustion-supporting air channel is divided into two levels, the central first-level gas is positioned in the central primary air channel, the second-level gas is positioned in the secondary air channel and is arranged close to the outer side of the central primary air channel, and the third-level gas is positioned in the secondary air channel and is arranged close to the outer side. The multi-stage distribution and multi-gun injection of fuel and air can make the gas be uniformly mixed and quickly combusted, at the same time can disperse fuel so as to attain the goal of controlling combustion temperature and reducing nitrogen oxide discharge. The outlet of the central primary air channel is provided with swirl blades which do not occupy the whole primary air outlet channel, and the center of the central primary air channel is provided with a direct current channel. The central direct current channel is mainly used for meeting the air distribution requirement of the primary stage of the fuel gas, and ignition and stable combustion at the center of the combustor are guaranteed through stable combustion of the swirl vanes. The end face of the three-stage gas spray gun is inclined to the center, and the spray hole shaft is intersected with the central axis of the burner, so that peripheral gas and rotational flow secondary air can be quickly and uniformly mixed, and the length of a spray hole extending out of the three-stage gas spray gun and the size of an end face oblique angle are changed, so that the purpose of adjusting the flame diameter and the flame length can be achieved.
Claims (9)
1. The gas low-nitrogen combustor comprises a gas channel, a combustion-supporting air channel and a wind box (11); the method is characterized in that: the gas channels are arranged in three layers, namely a central primary gas channel (2), a secondary gas channel (3) and a tertiary gas channel (4); the combustion-supporting air channel is divided into a central primary air channel (5) and an outer secondary air channel (6); inlets of the combustion-supporting air channels are uniformly distributed in the air box (11); the primary gas channel (2) is located in the central primary air channel (5), the secondary gas channel (3) is located in the secondary air channel (6) and is arranged outside the central primary air channel in a clinging mode, and the tertiary gas channel (4) is located in the secondary air channel (6) and is arranged outside the secondary gas channel (3) in a clinging mode.
2. The gas fired low-nitrogen burner of claim 1, wherein: the center of the primary air channel (5) is provided with a central ignition channel, and the central ignition channel is provided with a central ignition device (1); the primary gas channel (2) is a direct injection gun, primary gas is injected into the furnace through a certain number of direct injection guns, the spray guns are uniformly distributed outside the central ignition device (1) and are integrally located in the center of the central primary air channel, and the primary gas accounts for 5-15% of the total gas.
3. The gas fired low-nitrogen burner of claim 2, wherein: the outlet of the central primary air channel (5) is provided with a stable combustion primary air swirl blade (9), the blade does not occupy the whole primary air channel, the blade root is 0.25-0.3 times of the height of the blade as a direct-flow channel, the rest are axial blade swirl channels, and the angle of the swirl blade is 30-50 degrees.
4. The gas fired low-nitrogen burner as claimed in one of claims 1 to 3, wherein: the inlet of the central primary air channel (5) is provided with a primary air quantity adjusting device (7).
5. The gas fired low-nitrogen burner of claim 1, wherein: and a secondary gas channel (3) is uniformly arranged at the outer side of the central primary air channel, the secondary gas channel (3) is a straight spray gun, secondary gas is sprayed into the furnace through a certain number of direct spray guns, and the secondary gas accounts for 20-40% of the total gas.
6. The gas fired low-nitrogen burner of claim 1, wherein: the third-stage gas channel (4) is a straight spray gun, the third-stage gas is sprayed into the furnace by arranging a certain number of spray guns, the spray guns are uniformly distributed at the periphery of the outlet of the secondary air channel, and the third-stage gas accounts for 50-60% of the total gas.
7. The gas low-nitrogen burner of claim 5, wherein the lances of the tertiary gas passage are wedge-shaped inclined end faces, the normal directions of all the inclined end faces of the lances intersect with the central axis of the burner, and the included angle α between the end faces is 10-30 °.
8. The gas fired low-nitrogen burner of claim 1, wherein: the secondary air channel (6) forms a rotational flow structure through the tangential blades, and the strength of the rotational flow is adjusted through the connecting rod.
9. The gas fired low-nitrogen burner of claim 2, wherein: the primary gas channel (2), the secondary gas channel (3) and the tertiary gas channel (4) are coaxially and uniformly arranged outside the central ignition device (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920959846.6U CN210485720U (en) | 2019-06-24 | 2019-06-24 | Gas low-nitrogen burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920959846.6U CN210485720U (en) | 2019-06-24 | 2019-06-24 | Gas low-nitrogen burner |
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| CN210485720U true CN210485720U (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920959846.6U Active CN210485720U (en) | 2019-06-24 | 2019-06-24 | Gas low-nitrogen burner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207120A (en) * | 2019-06-24 | 2019-09-06 | 上海锅炉厂有限公司 | A kind of combustion gas low NO |
| CN111810951A (en) * | 2020-07-17 | 2020-10-23 | 北京泷涛环境科技有限公司 | Environment-friendly combustor with ultralow nitrogen oxide emission |
-
2019
- 2019-06-24 CN CN201920959846.6U patent/CN210485720U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207120A (en) * | 2019-06-24 | 2019-09-06 | 上海锅炉厂有限公司 | A kind of combustion gas low NO |
| CN111810951A (en) * | 2020-07-17 | 2020-10-23 | 北京泷涛环境科技有限公司 | Environment-friendly combustor with ultralow nitrogen oxide emission |
| CN111810951B (en) * | 2020-07-17 | 2022-06-28 | 北京泷涛环境科技有限公司 | Environment-friendly combustor with ultralow nitrogen oxide emission |
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