CN1226552C - Low Nox combustor with mixed coal and gas fuel - Google Patents
Low Nox combustor with mixed coal and gas fuel Download PDFInfo
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- CN1226552C CN1226552C CN 02157757 CN02157757A CN1226552C CN 1226552 C CN1226552 C CN 1226552C CN 02157757 CN02157757 CN 02157757 CN 02157757 A CN02157757 A CN 02157757A CN 1226552 C CN1226552 C CN 1226552C
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Abstract
The present invention relates to a composite coal and gas burning low-NOx burner which comprises 14 suspend and assembled nozzles including one gas nozzle, 5 powdered coal nozzles, 7 air nozzles and one oil nozzle, wherein the nozzles are arranged from top to bottom successively: air, gas, air, powdered coal, air, powdered coal, air, powdered coal, air, powdered coal and air. The oil nozzle is arranged in the lowermost air nozzle. All nozzles are arranged in a big tank body behind which a big air box is arranged. The gas nozzle, the powdered coal nozzles and the oil nozzle are all connected with a gas pipeline, powdered coal pipelines and an oil pipeline by passing through the air box. The burner with simple structure can reduce NOx discharge by 70%, so the NOx discharge concentration in flue gas is nearly 200 mg/m<3>.
Description
Technical Field
The invention relates to a coal-gas combined low NOx burner, belonging to a new combustion device in the field of energy.
Background
At present, a thermal generator set mainly burns pulverized coal, that is, coal is ground into powdery fuel by a coal mill and then sent into a boiler to be burnt under the carrying of hot air. The chemical energy of the fuel is converted into heat energy by combustion and is transferred to the working medium, and the working medium pushes the turbonator to generate electricity. One of the core components in pulverized coal combustion is a pulverized coal burner, which is also one of the core components of a boiler. For many years, many pulverized coal burners have appeared, such as blunt body burners, hull burners, two-channel pulverized coal burners, preheating chamber burners, air shovel type burners, and the like, from the viewpoint of safe, economical, and reliable operation. The novel pulverized coal burners play a great role in improving the stable combustion and saving oil of the coal-fired boiler of the thermal power plant, have more and more strict requirements on the emission of pollutants of the coal-fired boiler of the thermal power plant along with the enhancement of the requirements on environmental protection, and are urgent to reduce the atmospheric pollution caused by the coal-fired boiler. The burner described above does not meet these requirements. The pollutant substances in the flue gas of the coal-fired boiler are mainly dust, SOx, NOx and the like, wherein the NOx control emission technology comprises low-oxygen combustion, flue gas recirculation, staged combustion, low-NOx combustion and the like from the combustion angle. Therefore, the pulverized coal burners such as a rich-lean burner and a two-channel rich-lean burner are correspondingly appeared, the NOx is reduced by 50 percent, but the requirement of the environmental protection standard of developed countries in the world for low NOx is still far from being met, for example, the NOx emission is lower than 200mg/m3。
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a coal-fired gas combined low NOx burner for deeply reducing NOx, so that the NOx emission in boiler flue gas of a thermal power plant can meet the requirement of the developed national environmental standard in the world on low NOx.
The mechanism of the invention is that gas fuel including natural gas, coke oven gas, city gas and the like is used as reducing agent to be sprayed into a hearth at the upper part of a pulverized coal burner, so that NOx generated by the combustion of the pulverized coal at the lower part is reduced, and the reaction mechanism is as follows:
the technical scheme of the invention is realized based on the mechanism, the coal-fired and gas-fired combined low NOx burner is a group of suspended combined nozzles and comprises air nozzles, gas nozzles, coal-fired nozzles and oil nozzles, the number of the burners is 14, wherein 1 gas nozzle, 5 coal powder nozzles, 7 air nozzles and 1 oil nozzle are arranged from top to bottom in sequence: the air nozzle, the gas nozzle, the air nozzle, the pulverized coal nozzle, the oil nozzle are arranged in the lowest air nozzle, all the nozzles are arranged in a large trough body, a large air box is arranged behind the trough body, the air box is connected with all the air nozzles, and the gas nozzle, the pulverized coal nozzle and the oil nozzle penetrate through the air box and are connected with a gas pipeline, a pulverized coal pipeline and an oil pipeline.
According to the scheme, the coal-fired gas combined low NOx burner is simple in structure, NOx emission can be reduced by 70%, and NOx emission concentration in flue gas is close to 200mg/m3。
Drawings
FIG. 1 is a structural side view of a coal-gas combustion combined type low NOx burner,
fig. 2 is a front view of a structure of a coal-gas fired combined type low NOx burner.
Detailed Description
As shown in fig. 1 and 2, the coal-fired gas-fired combined low NOx burner is a suspended combined nozzle, and comprises 14 nozzles, wherein 1 gas nozzle, 5 pulverized coal nozzle, 7 air nozzles and 1 oil nozzle are arranged from top to bottom: the air nozzle 1, the air nozzle 2, the air nozzle 3, the coal powder nozzle 4, the air nozzle 5, the coal powder nozzle 6, the air nozzle 7, the coal powder nozzle 8, the air nozzle 9, the coal powder nozzle 10, the air nozzle 11, the coal powder nozzle 12 and the oil nozzle 14 are arranged in the lowest air nozzle 13, all the nozzles are arranged in alarge groove body 15, a large air box is arranged behind the groove body and connected with the air nozzles, and the air nozzle, the coal powder nozzle and the oil nozzle penetrate through the air box and are connected with a gas pipeline, a coal powder pipeline and an oil pipeline. As shown in figure 1, the air nozzles and gas nozzles at the lower part of the burner are distributed at equal intervals, the distance between the air nozzles and the gas nozzles at the upper part of the burner is different according to the capacity of the unit and the type of coal to be burned, and the distance between the gas at the upper part of the burner and the lower part of the air nozzles is larger than the distance between the gas nozzles and the air nozzles, and is generally more than 1.0 meter. The coal-fired nozzle and the air nozzle can be swung up by 25 degrees and swung down by 25 degrees; the gas nozzle is fixed, and the included angle between the central line of the gas nozzle and the horizontal line is 0-10 degrees. The outlet of each nozzle is provided with an expansion joint and a flow equalizing plate, and the depth of the expansion joint and the flow equalizing plate is determined according to the specific structure.
Claims (4)
1. The utility model provides a coal-fired gas combined type hangs down NOx combustor which characterized in that, it is a set of combination nozzle that suspends, comprises air nozzle, gas nozzle and oil nozzle, and the combustor has 14 nozzles altogether, and wherein 1 gas nozzle, 5 buggy nozzle, 7 air nozzle, 1 oil nozzle arrange in proper order from the top down: the air nozzle (1), the air nozzle (2), the air nozzle (3), the coal powder nozzle (4), the air nozzle (5), the coal powder nozzle (6), the air nozzle (7), the coal powder nozzle (8), the air nozzle (9), the coal powder nozzle (10), the air nozzle (11), the coal powder nozzle (12) and the oil nozzle (14) are arranged in the lowermost air nozzle (13), all the nozzles are arranged in a large groove-shaped body (15), a large air box is arranged behind the groove-shaped body, the air box is connected with the air nozzles, and the air nozzle, the coal powder nozzle and the oil nozzle penetrate through the air box to be connected with a gas pipeline, a coal powder pipeline and an oil pipeline.
2. The coal and gas combined low NOx burner of claim 1, wherein the air nozzles and the gas nozzles are equidistantly arranged at the lower portion of the burner, and the distance between the gas nozzle at the upper portion of the burner and the upper and lower air nozzles is greater than the distance between the gas nozzle and the air nozzle.
3. The coal-gas combined low NOx burner of claim 1, wherein the coal-fired nozzle and the air nozzle can be swung up and down by 25 degrees; the gas nozzle is fixed, and the included angle between the central line of the gas nozzle and the horizontal line is 0-10 degrees.
4. The coal and gas combination type low NOx burner of claim 1, wherein an expansion gap and a flow equalizing plate are disposed at each nozzle outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02157757 CN1226552C (en) | 2002-12-26 | 2002-12-26 | Low Nox combustor with mixed coal and gas fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02157757 CN1226552C (en) | 2002-12-26 | 2002-12-26 | Low Nox combustor with mixed coal and gas fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1510335A CN1510335A (en) | 2004-07-07 |
| CN1226552C true CN1226552C (en) | 2005-11-09 |
Family
ID=34236687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02157757 Expired - Fee Related CN1226552C (en) | 2002-12-26 | 2002-12-26 | Low Nox combustor with mixed coal and gas fuel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1226552C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101363620B (en) * | 2007-08-08 | 2010-04-07 | 上海理工大学 | Low NOx combustion system by re-burning partial gas by gasifying coal |
| CN107033927B (en) * | 2017-06-20 | 2019-08-27 | 中冶焦耐(大连)工程技术有限公司 | A kind of coke oven combustion chamber flue structure of segmentally heating |
| CN107057721B (en) * | 2017-06-20 | 2019-06-14 | 中冶焦耐(大连)工程技术有限公司 | The method for realizing low nitrogen burning in coke oven combustion chamber flue |
| CN107033926B (en) * | 2017-06-20 | 2019-08-27 | 中冶焦耐(大连)工程技术有限公司 | Realize the coke oven combustion chamber flue structure of low nitrogen oxide burning |
-
2002
- 2002-12-26 CN CN 02157757 patent/CN1226552C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1510335A (en) | 2004-07-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER OWNER: BAOSHAN IRON AND STEEL CO., LTD. ELECTRIC FACTORY Effective date: 20050610 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20050610 Address after: 200093 No. 516, military road, Shanghai Applicant after: University of Shanghai for Science and Technology Co-applicant after: Baoshan Iron & Steel Co., Ltd. Address before: 200093 No. 516, military road, Shanghai Applicant before: University of Shanghai for Science and Technology Co-applicant before: Baoshan Iron Steel Co power plant |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051109 Termination date: 20101226 |