CN212204519U - Low-nitrogen gas burner - Google Patents
Low-nitrogen gas burner Download PDFInfo
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- CN212204519U CN212204519U CN202020498898.0U CN202020498898U CN212204519U CN 212204519 U CN212204519 U CN 212204519U CN 202020498898 U CN202020498898 U CN 202020498898U CN 212204519 U CN212204519 U CN 212204519U
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Abstract
A low-nitrogen gas burner comprises a burner outer barrel, a tertiary air rotational flow nozzle, a secondary air inclined spray pipe, a primary air injection pipe, a gas spray pipe, a combustion-supporting air inlet and a gas pipeline. The utility model discloses a lean oxygen burning flame is once formed with once drawing the air through gas spray tube spun gas. The secondary air is obliquely blown to the primary combustion flame, so that combustion-supporting air required by secondary combustion can be provided, and unburned fuel gas and flue gas generated by combustion can be quickly blown away from the high-temperature combustion area. Tertiary airThe gas is sent into the hearth from the outermost layer of the combustor in a rotational flow shape, under the action of strong rotational flow air, the mixing of gas and air is accelerated, the combustion efficiency is improved, the generation of local high temperature of flame is prevented, meanwhile, the oxygen content is reduced by the backflow of partial flue gas, and the generation of NOx is inhibited. Through the operation, the NOx emission mass concentration of the gas burner is reduced to 30mg/m3The device meets the requirements of the latest environmental protection standard, and has simple structure and convenient operation.
Description
Technical Field
The utility model relates to a burning technical field is a clean burner, concretely relates to novel low nitrogen gas burner.
Background
China is the largest iron and steel producing country in the world, and the yield of crude steel in 2018 is 9.28 hundred million tons, which accounts for 51.3 percent of the total yield of crude steel in the world. The steel industry is a large energy-consuming household, and has a plurality of pollution-producing links and large pollution discharge. According to measurement and calculation, the emission amounts of sulfur dioxide, nitrogen oxides and particulate matters in the iron and steel industry in 2018 are respectively 105 ten thousand tons, 163 ten thousand tons and 273 ten thousand tons, which account for about 6%, 9% and 19% of the total national emission amount and are one of the main air pollution emission sources in China at present.
Nitrogen oxides (NOx) are one of the main harmful substances in flue gases produced by combustion, and NOx in the atmosphere mainly results from combustion. The high-concentration NOx emission brings huge economic loss, and causes acid rain in over 40% of the territorial area of China. Moreover, NOx emission into the atmosphere produces photochemical smog that ultimately leads to ozone layer destruction, greenhouse effects, crop reduction, eye and respiratory diseases in humans and animals, and even more direct mortality.
It can be seen that the traditional gas burner can not meet the emission requirement, the low-NOx gas burner will become the mainstream direction of new development, and the market demand is very large. At present, the low NOx gas burner in China mainly depends on foreign import, and the low NOx gas burner not only has the phenomenon of water and soil incompatibility, but also has high price. Therefore, the independent research and development of advanced low NOx gas burner has important practical significance
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lowThe nitrogen gas burner adopts a novel burner structure with different angles and multi-stage air supply, so that a local high-temperature area possibly formed by flame is avoided in the burning process of the burner, and the generation concentration of NOx is reduced. The utility model provides a pair of low-nitrogen gas burner, NOx's emission mass concentration is less than 30mg/m in the combustion process3。
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a low-nitrogen gas burner comprises a burner outer cylinder, a tertiary air rotational flow spray nozzle, a secondary air inclined spray pipe, a primary air injection pipe, a gas spray pipe, a combustion-supporting air inlet and a gas pipeline; a combustion-supporting air pipeline is formed in the outer combustor cylinder, a combustion-supporting air inlet is formed in the outer combustor cylinder, and the gas pipeline extends into the outer combustor cylinder; a gas spray pipe, a secondary air inclined spray pipe and a tertiary air rotational flow spray head are sequentially distributed at the outlet of the outer combustor cylinder from inside to outside along the radial direction by taking the central combustor shaft as the center; each gas spray pipe is sleeved with a primary air injection pipe, the gas spray pipe is communicated with a gas pipeline, and the primary air injection pipe is communicated with a combustion-supporting air pipeline; the secondary air inclined spray pipe and the tertiary air rotational flow spray head are respectively communicated with a combustion-supporting air pipeline, and the outlet of the secondary air inclined spray pipe is obliquely arranged towards the axial center direction.
Six gas spray pipes are uniformly distributed in a circular array.
Six secondary air inclined spray pipes are uniformly distributed in a circular array.
The secondary air inclined nozzle and the central shaft of the combustor are inclined at an angle of 10-15 degrees.
The twisting angle of the rotational flow nozzle of the tertiary air rotational flow spray head is 25-45 degrees.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a low nitrogen gas combustion ware is when concrete operation, through gas spray tube spun gas with draw the air formation of penetrating once lean oxygen burning flame once. The secondary air is obliquely blown to the primary combustion flame, thereby not only providing combustion-supporting air required by secondary combustion, but also unburned fuel gas and combustionThe generated flue gas is blown away from the high-temperature combustion area quickly. The tertiary air is sent into the hearth from the outermost layer of the combustor in a rotational flow shape, under the action of strong rotational flow air, the mixing of fuel gas and air is accelerated, the combustion efficiency is improved, the generation of local high temperature of flame is prevented, meanwhile, the oxygen content is reduced due to the backflow of partial flue gas, and the generation of NOx is inhibited. Through the operation, the NOx emission mass concentration of the gas burner is reduced to 30mg/m3The device meets the requirements of the latest environmental protection standard, and has the advantages of simple structure, convenient operation and good economic and social benefits.
Drawings
Fig. 1 is a schematic view of a partial structure of the present invention;
fig. 2 is a cross-sectional view of the present invention;
fig. 3 is a schematic view of the overall structure of the present invention.
In the figure: 1-a burner outer cylinder, 2-tertiary air rotational flow spray heads, 3-secondary air inclined spray pipes, 4-primary air injection pipes, 5-fuel gas spray pipes, 6-combustion air inlets and 7-fuel gas pipelines.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
referring to fig. 1-3, a low-nitrogen gas burner comprises a burner outer cylinder 1, a tertiary air rotational flow nozzle 2, a secondary air inclined nozzle 3, a primary air ejector pipe 4, a gas nozzle 5, a combustion air inlet 6 and a gas pipeline 7; a combustion-supporting air pipeline is formed in the outer burner cylinder 1, a combustion-supporting air inlet 6 is formed in the outer burner cylinder 1, and the gas pipeline 7 extends into the outer burner cylinder 1; a gas spray pipe 5, a secondary air inclined spray pipe 3 and a tertiary air rotational flow spray head 2 are sequentially distributed at the outlet of the outer combustor cylinder 1 from inside to outside along the radial direction by taking the central combustor shaft as the center; a primary air injection pipe 4 is sleeved outside each gas spray pipe 5, the gas spray pipes 5 are communicated with a gas pipeline 7, and the primary air injection pipes 4 are communicated with a combustion-supporting air pipeline; the secondary air inclined spray pipe 3 and the tertiary air rotational flow spray head 2 are respectively communicated with a combustion-supporting air pipeline, and the outlet of the secondary air inclined spray pipe 3 is obliquely arranged towards the axial center direction.
Six gas spray pipes 5 are uniformly distributed in a circular array.
Six secondary air inclined spray pipes 3 are uniformly distributed in a circular array.
The secondary air inclined nozzle 3 and the central shaft of the burner are inclined at an angle of 10-15 degrees.
The twisting angle of the swirl nozzle of the tertiary air swirl nozzle 2 is 25-45 degrees, and the tertiary air swirl nozzle 2 and the burner outer cylinder 1 form a swirl air channel.
The gas spray pipe 5, the secondary air inclined spray pipe 3 and the tertiary air rotational flow spray head 2 are sequentially distributed from inside to outside by taking the axial center of the burner as a circle center. The innermost layer is six gas spray pipes 5, and a primary air injection pipe 4 is sleeved outside each gas spray pipe 5 to form a primary combustion structure which is distributed in a circular array. Six oblique secondary air oblique nozzles 3 are arranged on the secondary outer layer, are distributed in a circular array and converge towards the extension direction of the central shaft of the burner at a certain inclination angle, and the intersection angles of the six secondary air oblique nozzles 3 converge on the top flame surface of the flame. The outmost tertiary air swirl nozzle 2 and the burner outer cylinder 1 form a swirl air channel.
The primary air injection pipe 4, the secondary air inclined spray pipe 3 and the tertiary air rotational flow nozzle 2 are all supplied with air through a combustion air inlet 6; the gas lance 5 is supplied with gas via a gas line 7. The primary air injection pipe 4 and the gas spray pipe 5 are in a sleeve structure, primary air is brought in by the injection effect of the gas spray pipe 5, the primary air is mixed and simultaneously diffused and combusted, and flame is sprayed into a hearth.
The utility model discloses a concrete working process does:
the gas nozzle 5 divides the gas into six streams to be sprayed out of the burner, and drives primary air to be mixed, combusted, diffused and sent into the hearth. Because the multi-stream jet of the fuel gas improves the uniformity of mixing with primary air, the heat dissipation area is enlarged, the combustion temperature is reduced, and the generation amount of NOx is reduced.
The combustion air is sent out in three stages in the combustor. Wherein, the primary air is introduced into the mixed combustion process by the injection action of the gas nozzle 5, and the primary air and the mixed combustion process are subjected to oxygen-deficient combustion in the hearth, so that the generation of NOx is inhibited; the secondary air and the central shaft of the burner form an angle of 15 degrees and blow to the flame of primary combustion, the intersection angle is positioned on the flame top flame surface, and the high-temperature flue gas and unburnt gas generated after primary combustion are mixed, so that oxygen can be provided for secondary combustion, the gas and air are mixed more sufficiently, the flue gas generated by combustion can be blown away from a high-temperature combustion area rapidly, the residence time of the flue gas in the high-temperature area is shortened, and the generation amount of NOx is reduced. The tertiary air is sent into the flame contour by the tertiary air swirl nozzle 2 at the outermost layer in a swirl shape, under the action of strong swirl air, the mixing of fuel gas and air is accelerated, the combustion is stabilized and the combustion reaction is accelerated, the combustion efficiency is improved, and the strong swirl air enables the outlet of the combustor to generate a backflow area, the surrounding flue gas is stirred to flow back into the flame contour, the self-circulation of the flue gas is formed, the generation of local high temperature of the flame is prevented, meanwhile, the oxygen-deficient environment and condition are created, and the generation of NOx is inhibited.
Claims (5)
1. A low-nitrogen gas burner is characterized by comprising a burner outer barrel, a tertiary air rotational flow nozzle, a secondary air inclined spray pipe, a primary air injection pipe, a gas spray pipe, a combustion-supporting air inlet and a gas pipeline; a combustion-supporting air pipeline is formed in the outer combustor cylinder, a combustion-supporting air inlet is formed in the outer combustor cylinder, and the gas pipeline extends into the outer combustor cylinder; a gas spray pipe, a secondary air inclined spray pipe and a tertiary air rotational flow spray head are sequentially distributed at the outlet of the outer combustor cylinder from inside to outside along the radial direction by taking the central combustor shaft as the center; each gas spray pipe is sleeved with a primary air injection pipe, the gas spray pipe is communicated with a gas pipeline, and the primary air injection pipe is communicated with a combustion-supporting air pipeline; the secondary air inclined spray pipe and the tertiary air rotational flow spray head are respectively communicated with a combustion-supporting air pipeline, and the outlet of the secondary air inclined spray pipe is obliquely arranged towards the axial center direction.
2. The low-nitrogen gas burner as claimed in claim 1, wherein the number of the gas nozzles is six and the gas nozzles are uniformly distributed in a circular array.
3. The low-nitrogen gas burner of claim 1, wherein the secondary air inclined nozzles are six and are uniformly distributed in a circular array.
4. A low-nitrogen gas burner as recited in claim 1, wherein said secondary air angled nozzle is angled at an angle of 10 ° to 15 ° with respect to the central burner axis.
5. The low-nitrogen gas burner as claimed in claim 1, wherein the swirl nozzle twist angle of the tertiary air swirl nozzle is 25 ° -45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020498898.0U CN212204519U (en) | 2020-04-08 | 2020-04-08 | Low-nitrogen gas burner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020498898.0U CN212204519U (en) | 2020-04-08 | 2020-04-08 | Low-nitrogen gas burner |
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| CN212204519U true CN212204519U (en) | 2020-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183758A (en) * | 2022-02-16 | 2022-03-15 | 浙江百能科技有限公司 | Device for burning wastes by low-calorific-value gas |
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- 2020-04-08 CN CN202020498898.0U patent/CN212204519U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183758A (en) * | 2022-02-16 | 2022-03-15 | 浙江百能科技有限公司 | Device for burning wastes by low-calorific-value gas |
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