CN102384468A - Separating over-fired air (SOFA) brown coal combustor and combustion method - Google Patents
Separating over-fired air (SOFA) brown coal combustor and combustion method Download PDFInfo
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- CN102384468A CN102384468A CN2011103679947A CN201110367994A CN102384468A CN 102384468 A CN102384468 A CN 102384468A CN 2011103679947 A CN2011103679947 A CN 2011103679947A CN 201110367994 A CN201110367994 A CN 201110367994A CN 102384468 A CN102384468 A CN 102384468A
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Abstract
The invention provides a separating over-fired air (SOFA) brown coal combustor and a combustion method. A uniform wind distribution manner or a shrunk-middle wind distribution manner is adopted in the conventional 30MW boilers and 60MW boilers; and by adopting the wind distribution manner of the combustor, the combustion efficiency of pulverized coal, the low-load ability, and the like can be guaranteed, but the wind distribution manner generally has the defect of high nitrogen oxide (NOx) emission amount, and the like. The SOFA brown coal combustor comprises a combustor (1), wherein the combustor adopts a multi-layer SOFA wind nozzle; a manual swinging mechanism is used for driving the nozzle to swing; an anti-tangential angle is designed as 18 DEG; the SOFA combustor, an upper part pulverized coal combustor and a lower part pulverized coal combustor are mounted in the middle of a water cooling wall of a boiler in sequence; a group of air chambers are arranged in each combustor; an air wind chamber, a pulverized coal wind chamber, an oil wind chamber, a pulverized coal wind chamber, an oil wind chamber, a pulverized coal wind chamber and an air wind chamber are arranged in the upper part pulverized coal combustor (4) in sequence; and an air wind chamber, a pulverized coal wind chamber, an oil wind chamber, a pulverized coal wind chamber, an oil wind chamber, a pulverized coal wind chamber and an air wind chamber are arranged in the lower part pulverized coal combustor (5) in sequence. The SOFA brown coal combustor can be used in the 30MW boilers and the 60MW boilers.
Description
Technical field:
invention relates to a kind of field of boilers that is used for; Be specifically related to a kind of divergence type after-flame wind brown coal burner and combustion method.
Background technology:
are in 300MW, 600 MW grade boilers in the past; Coal burner is according to the difference of ature of coal; Basically adopt impartial air distribution or waisting shape air distribution mode; The air distribution mode of this burner can guarantee coal dust firing efficient, underload ability etc., but defectives such as ubiquity nitrogen oxide NOx discharge capacity height.
are along with development and national economy; Country is increasingly high to environmental protection requirement, and pulverized-coal fired boiler nitrogen oxide NOx discharging is explicitly called for, and has been difficult to meet the demands by the design of former coal burner; In order to meet the need of market; Require reduction factory heat consumption rate, reduction nitrogen oxide NOx discharging, especially China's brown coal reserves to enrich the boiler using brown coal extensive market.
Summary of the invention:
The purpose of
invention provides a kind of when guaranteeing efficient burning, safe operation, can effectively reduce the divergence type after-flame wind brown coal burner and the combustion method of the discharging of nitrogen oxide NOx.
Above-mentioned purpose realizes through following technical scheme:
a kind of divergence type after-flame wind brown coal burner; Its composition comprises: burner; Burner adopts multilayer SOFA wind snout; Manually swing mechanism drives the swing of nozzle; Design traditional method of indicating the pronunciation of a Chinese character angle is 18 degree, and described divergence type after-flame wind SOFA burner and top coal burner and lower coal powder burner are installed in the boiler water wall middle part in order, have one group of air chamber in the described burner; Have air air compartment, coal dust air compartment, alopecia areata chamber, coal dust air compartment, alopecia areata chamber, coal dust air compartment and air air compartment in the coal burner of described top in order, have air air compartment, coal dust air compartment, alopecia areata chamber, coal dust air compartment, alopecia areata chamber, coal dust air compartment, air air compartment in the described lower coal powder burner in order.
The combustion method of
a kind of divergence type after-flame wind brown coal burner through suitable SOFA wind rate, is realized fractional combustion; Burner adopts multilayer SOFA wind snout; Secondary wind is sent into burner hearth from the SOFA nozzle, and SOFA after-flame air compartment is provided with for reducing nitrogen oxide NOX growing amount according to the air stage feeding principle, and one group of SOFA after-flame air compartment is arranged at burner top, every angle; The needed air that burns is sent into by divergence type after-flame wind SOFA burner after-flame air compartment; Drive the swing of nozzle by manual swing mechanism, design traditional method of indicating the pronunciation of a Chinese character angle is 18 degree, and control furnace outlet gas temperature deviation is burnt in guarantee value.
The combustion method of described divergence type after-flame wind brown coal burner is realized fractional combustion, forms low excess air coefficient in the combustion zone, causes weak reducing atmosphere, thereby makes nitric oxide NO reduction become nitrogen N
2
, reduce " fuel type " nitrogen oxide, take SOFA to draw back mode, make the SOFA air quantity certain distance arranged apart from the combustion zone of burner.
Beneficial effect:
1. the invention solves present existing 300MW, 600 MW grade boiler brown coal burners; After-flame wind is arranged the burner top; There is not apart arrangement; General nitrogen oxide NOx discharging problem of higher, this product can effectively reduce the discharging of nitrogen oxide NOx when having guaranteed efficient burning, safe operation.
the present invention realizes fractional combustion; Form low excess air coefficient in the combustion zone, cause weak reducing atmosphere, thereby make nitric oxide NO reduction become nitrogen N 2; Reduce " fuel type " nitrogen oxide; The present invention takes SOFA to draw back mode, makes the SOFA air quantity apart from the combustion zone of burner certain distance arranged, and guarantees to form real fractional combustion.
the present invention can effectively reduce the discharging of NOx when guaranteeing efficient burning, safe operation, the nitrogen oxide NOx discharging is～240mg/NM3.
the present invention has confirmed rational chamber structure size, and the after-flame height of fuel etc., avoided the generation of coking, guaranteed the security and the reliability of boiler operatiopn; Confirm burner hearth, realize that the performance of thermic load data, burner is reasonable, and have stronger fuel and unit capacity adaptability; Guarantee lower uncombusted loss and nitrogen oxide NOx discharging, guaranteed the technical advance of boiler.
the present invention realizes fractional combustion; Form low excess air coefficient in the combustion zone; Cause weak reducing atmosphere, thereby make nitric oxide NO reduction become nitrogen N 2, reduce " fuel type " nitrogen oxide; Take SOFA to draw back mode, make the SOFA air quantity certain distance arranged apart from the combustion zone of burner; Guarantee to form real fractional combustion and guarantee certain efficiency of combustion, can guarantee the later stage air feed that burns, can reach the purpose of air stage feeding again.
Description of drawings:
accompanying drawing 1 is the burner plane arrangement sketch map of this product.
accompanying drawing 2 is SOFA burner plane arrangement sketch mapes of this product.
accompanying drawing 3 is SOFA burner facade arrangement sketch mapes.
accompanying drawing 4 is facade arrangement sketch mapes of top coal burner.
accompanying drawing 5 is facade arrangement sketch mapes of lower coal powder burner.
accompanying drawing 6 is B portion partial enlarged drawings in the accompanying drawing 1.
accompanying drawing 7 is A portion partial enlarged drawings in the accompanying drawing 1.
The specific embodiment:
Embodiment 1:
a kind of divergence type after-flame wind brown coal burner; Piece number 2 among the figure; Its composition comprises: burner, and piece number 3 in the accompanying drawing, and described burner and top coal burner 4 and lower coal powder burner 5 are installed in the middle part of boiler water wall 1 in order.Burner adopts multilayer SOFA wind snout; Manually swing mechanism drives the swing of nozzle; Design traditional method of indicating the pronunciation of a Chinese character angle is 18 degree; Have one group of air chamber in the described burner, have air air compartment 8, coal dust air compartment 7, alopecia areata chamber 6, coal dust air compartment, alopecia areata chamber, coal dust air compartment and air air compartment in the coal burner of described top in order, have air air compartment, coal dust air compartment, alopecia areata chamber, coal dust air compartment, alopecia areata chamber, coal dust air compartment, air air compartment in the described lower coal powder burner in order.
The combustion method of
a kind of divergence type after-flame wind brown coal burner; Select SOFA wind rate for use, realize fractional combustion, burner adopts multilayer SOFA wind snout; A certain proportion of secondary wind is sent into burner hearth from the SOFA nozzle; SOFA after-flame air compartment is provided with for reducing nitrogen oxide NOX growing amount according to the air stage feeding principle, and which floor SOFA after-flame air compartment is all arranged at burner top, every angle, and the needed air of a certain proportion of burning is sent into by divergence type after-flame wind SOFA burner after-flame air compartment; Drive the swing of nozzle by manual swing mechanism; Design traditional method of indicating the pronunciation of a Chinese character angle is 18 degree, and concrete switch and pendulum angle confirm that according to the condition of scene operation control furnace outlet gas temperature deviation is burnt in the guarantee value of regulation.
combustion method of the present invention; Can realize fractional combustion, form low excess air coefficient in the combustion zone, cause weak reducing atmosphere; Thereby make nitric oxide NO reduction become nitrogen N 2; Reduce " fuel type " nitrogen oxide, the present invention takes SOFA to draw back mode, makes the SOFA air quantity apart from the combustion zone of burner certain distance arranged.
this product is according to the market demand; Require to reduce factory's heat consumption rate, make 300MW, 600 super critical boiler increases in demand, especially China's brown coal reserves enrich; The boiler using brown coal extensive market, the brown coal low-NOx combustor of therefore developing burning high-moisture is imperative.
Claims (3)
1. divergence type after-flame wind brown coal burner; Its composition comprises: burner; It is characterized in that: burner adopts multilayer SOFA wind snout; Manually swing mechanism drives the swing of nozzle; Design traditional method of indicating the pronunciation of a Chinese character angle is 18 degree, and described divergence type after-flame wind SOFA burner and top coal burner and lower coal powder burner are installed in the boiler water wall middle part in order, have one group of air chamber in the described burner; Have air air compartment, coal dust air compartment, alopecia areata chamber, coal dust air compartment, alopecia areata chamber, coal dust air compartment and air air compartment in the coal burner of described top in order, have air air compartment, coal dust air compartment, alopecia areata chamber, coal dust air compartment, alopecia areata chamber, coal dust air compartment, air air compartment in the described lower coal powder burner in order.
2. the combustion method of a divergence type after-flame wind brown coal burner is characterized in that: through suitable SOFA wind rate, realize fractional combustion; Burner adopts multilayer SOFA wind snout; Secondary wind is sent into burner hearth from the SOFA nozzle, and SOFA after-flame air compartment is provided with for reducing nitrogen oxide NOX growing amount according to the air stage feeding principle, and one group of SOFA after-flame air compartment is arranged at burner top, every angle; The needed air that burns is sent into by divergence type after-flame wind SOFA burner after-flame air compartment; Drive the swing of nozzle by manual swing mechanism, design traditional method of indicating the pronunciation of a Chinese character angle is 18 degree, and control furnace outlet gas temperature deviation is burnt in guarantee value.
3. the combustion method of divergence type after-flame wind brown coal burner according to claim 2 is characterized in that: realize fractional combustion, form low excess air coefficient in the combustion zone, cause weak reducing atmosphere, thereby make nitric oxide NO reduction become nitrogen N
2, reduce " fuel type " nitrogen oxide, take SOFA to draw back mode, make the SOFA air quantity certain distance arranged apart from the combustion zone of burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103679947A CN102384468A (en) | 2011-11-18 | 2011-11-18 | Separating over-fired air (SOFA) brown coal combustor and combustion method |
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| CN2011103679947A CN102384468A (en) | 2011-11-18 | 2011-11-18 | Separating over-fired air (SOFA) brown coal combustor and combustion method |
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| CN102384468A true CN102384468A (en) | 2012-03-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712202A (en) * | 2013-12-19 | 2014-04-09 | 江联重工股份有限公司 | Combustion method for spherical flame boiler employing low-nitrogen ultra-lean volatile coke powder particles |
| CN109578992A (en) * | 2018-10-24 | 2019-04-05 | 苏州西热节能环保技术有限公司 | The method of SOFA air door adjusting tangentially-fired boiler reheat steam temperature two sides deviation |
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| JPH11211013A (en) * | 1998-01-30 | 1999-08-06 | Hitachi Ltd | Pulverized coal combustion burner and combustion method thereof |
| CN101900325A (en) * | 2010-07-16 | 2010-12-01 | 浙江大学 | Pulverized coal fired boiler wall type oscillating low NOx over-fire air device |
| CN202328187U (en) * | 2011-11-18 | 2012-07-11 | 哈尔滨锅炉厂有限责任公司 | Separated-type over-fire-air brown-coal burner |
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2011
- 2011-11-18 CN CN2011103679947A patent/CN102384468A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11211013A (en) * | 1998-01-30 | 1999-08-06 | Hitachi Ltd | Pulverized coal combustion burner and combustion method thereof |
| CN101900325A (en) * | 2010-07-16 | 2010-12-01 | 浙江大学 | Pulverized coal fired boiler wall type oscillating low NOx over-fire air device |
| CN202328187U (en) * | 2011-11-18 | 2012-07-11 | 哈尔滨锅炉厂有限责任公司 | Separated-type over-fire-air brown-coal burner |
Non-Patent Citations (4)
| Title |
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| 刘建华: "600MW超临界锅炉燃烧器的设计", 《锅炉制造》 * |
| 刘建华: "600MW超临界锅炉燃烧器的设计", 《锅炉制造》, no. 1, 31 January 2011 (2011-01-31) * |
| 广东电网公司电力科学研究院: "《锅炉设备及系统》", 31 January 2011, 中国电力出版社 * |
| 路野: "分离OFA燃烧对亚临界锅炉NOx排放的影响", 《节能技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712202A (en) * | 2013-12-19 | 2014-04-09 | 江联重工股份有限公司 | Combustion method for spherical flame boiler employing low-nitrogen ultra-lean volatile coke powder particles |
| CN109578992A (en) * | 2018-10-24 | 2019-04-05 | 苏州西热节能环保技术有限公司 | The method of SOFA air door adjusting tangentially-fired boiler reheat steam temperature two sides deviation |
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Application publication date: 20120321 |