CN102927568A - Dense-diluted pulverized coal burner with low NOX - Google Patents
Dense-diluted pulverized coal burner with low NOX Download PDFInfo
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- CN102927568A CN102927568A CN2012104452704A CN201210445270A CN102927568A CN 102927568 A CN102927568 A CN 102927568A CN 2012104452704 A CN2012104452704 A CN 2012104452704A CN 201210445270 A CN201210445270 A CN 201210445270A CN 102927568 A CN102927568 A CN 102927568A
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Abstract
The invention provides a dense-diluted pulverized coal burner with low NOX. The dense-diluted pulverized coal burner with low NOX comprises a primary airpipe, wherein a horizontal separating plate dividing the primary airpipe into an upper air chamber and a lower air chamber is arranged inside the primary airpipe. The upper air chamber and the lower air chamber are respectively provided with a group of window-shade type inspissator, the window-shade type inspissator in the lower air chamber comprises a plurality of blades extending in a horizontal direction. With the direction of the air flow of a primary wind powder as a reference direction, the blades respectively comprise a starting blade, a plurality of middle blades and an ending blade from the upstream to the down stream, the middle blades are in a flat plate type, and the windward side of the starting blade and the incline direction of the middle blades are identical and both inclined upwards and towards the down stream, the starting blade is provided with a leeside inclined downwards and towards the down stream, and the ending blade is inclined downwards and towards the down stream. The window-shade type inspissator in the upper air chamber also comprises a starting blade, a plurality of middle blades and an ending blade, and the starting blade, the plurality of middle blades and the ending blade of the window-shade type inspissator in the upper air chamber are symmetrically arranged with the corresponding blades of the window-shade type inspissator in the lower air chamber relative to the horizontal separate plate.
Description
Technical field
The present invention relates to a kind of burner of pulverized-coal fired boiler, be specifically related to a kind of low NO
XConcentration coal burner.
Background technology
In process of coal combustion, generated a large amount of oxides of nitrogen gas and (be called for short NO
X), NO
XCan bring seriously pollution with fume emission to environment to atmosphere, reduce NO
XDischarge capacity can be carried out from two aspects, and the one, the growing amount in the control combustion process can adopt low NO
XCombustion technology realizes; The 2nd, flue gas is carried out denitrogenation processing.Because the latter is expensive, that China gives priority to now is low NO
XCombustion technology.NO
XFormation mechanism have three kinds: thermal NO
X, fuel type NO
XWith Quick-type NO
X, wherein, fuel type NO
XRefer to that nitrogen decomposes and oxidation in the fuel generate NO
X, furtherly, mainly refer to the NO that the nitrogen compound in the volatile matter generates
X, its growing amount accounts for NO
XThe 60%-80% of total growing amount, this part NO
XFlame kernel at the burner outlet place generates.Control NO in this zone
XGrowing amount, just answer the catch fire excess air coefficient at initial stage of control combustion, make fuel form fuel-rich regions, allow coal dust be in anaerobic condition in the initial burning stage, to suppress the oxidation of nitrogen compound in the volatile matter, the actual NO that generates
XQuantity just can obviously reduce.
A kind of pulverized coal combustion is to adopt concentration coal burner, in a wind coal dust passage, be provided with pulverized coal concentrator, breeze airflow is separated into dense powder stream and two strands of air-flows of light powder stream, so just can under the constant prerequisite of wind total amount, improve the coal powder density in the dense powder stream, fuel in the dense powder stream is burnt under less than 1 condition at excess air coefficient, in the light powder stream fuel then excess air coefficient greater than or close to 1 condition under burn, two strands of air-flows make total excess air coefficient of burner outlet still remain within the rational scope altogether, dense powder stream can be accelerated flame propagation velocity, coal dust is caught fire as early as possible, after dense powder stream catches fire, for light powder stream provides the thermal source that catches fire, the latter is also caught fire thereupon, the combustion stability of whole torch strengthens, and does not throw oil combustion-supporting load regulation range and coal adaptability thereby enlarged boiler.
The method that realization coal powder light-dark in the concentration coal burner separates is mainly: channel bend inspissator, cyclone separator and venetian blind type inspissator.Fig. 1 shows existing a kind of shutter Horizontal burner (this figure is the top view after level is dissectd), the venetian blind type inspissator of airduct 31 interior settings comprises the Flat plate type blade of a plurality of vertical extensions, take the flow direction of primary wind and powder air-flow as reference direction, be from upstream to the downstream, blade is respectively start vane 32, some intermediate blades 33 and end of a period blade 34, the incline direction of start vane and intermediate blade consistent and with the angle of reference direction be acute angle, the overall alignment of start vane and intermediate blade is for arranging along its incline direction in turn, and the incline direction of end of a period blade and start vane is opposite.After the primary wind and powder air flow stream is crossed inspissator, realize that the coal dust horizontal bias separates, Speed Reduction behind the minimum flow section of primary wind and powder air-flow process intermediate blade and end of a period blade turning point, pressure drop, the pressure of nozzle exit is low than the pressure of surrounding environment, has strengthened the backflow effect of high-temperature flue gas, forms the recirculating zone, entrainment high-temperature flue gas, improve the stability that breeze airflow catches fire.
This shutter Horizontal burner realizes that the coal dust horizontal bias separates, and after the primary wind and powder airflow passes start vane, owing to forming larger vortex region at the start vane afterbody, consumes a large amount of main flow energy, produces larger mobile local losses.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of low NO
XConcentration coal burner, it can realize accelerating wind powder air-flow is concentrated, by the effect of entrainmenting to high-temperature flue gas, improves the ignition condition of coal dust, reduces NO
XGrowing amount.
In order to solve the problems of the technologies described above, technical scheme of the present invention is:
A kind of low NO
XConcentration coal burner, comprise airduct one time, the horizontal baffle that airduct is divided into ipper air chamber and lower air chamber is set in this airduct, one group of venetian blind type inspissator all is set in ipper air chamber and the lower air chamber, the venetian blind type inspissator that is positioned at lower air chamber comprises the blade that a plurality of horizontal directions are extended, take the flow direction of primary wind and powder air-flow as reference direction, be from upstream to the downstream, blade is respectively start vane, some intermediate blades and end of a period blade, it is flat that intermediate blade is, the incline direction of start vane windward side and intermediate blade is consistent all obliquely towards the downstream, start vane also has the oblique lower lee face that tilts towards the downstream, and the end of a period blade lean is downwards towards the downstream; The venetian blind type inspissator that is positioned at ipper air chamber comprises start vane, some intermediate blades and end of a period blade equally, and the venetian blind type inspissator respective vanes of they and lower air chamber is symmetrical arranged take horizontal baffle as the plane of symmetry.
Above-mentioned low NO
XConcentration coal burner, described start vane are the solid fin that is fixed on lower air chamber's base plate or the ipper air chamber's top board.
Above-mentioned low NO
XConcentration coal burner, described intermediate blade is 3, according to reference direction, be respectively first order intermediate blade, second level intermediate blade and third level intermediate blade, have the sleeve configuration narrow slit that along continuous straight runs extends on first order intermediate blade and the second level intermediate blade.
Above-mentioned low NO
XConcentration coal burner, the narrow slit on described first order intermediate blade and the second level intermediate blade is one, and is suitable with intermediate blade horizontal-extending length.
Above-mentioned low NO
XConcentration coal burner, described slit width are 15-20mm.
Above-mentioned low NO
XConcentration coal burner, the downstream side of described end of a period blade horizontal direction towards downstream extends to form level board.
Above-mentioned low NO
XConcentration coal burner, the spout of this burner also arranges surrounding air.
Above-mentioned low NO
XConcentration coal burner, the described surrounding air width that is positioned at the spout upper and lower sides is 14mm, the surrounding air width of left and right sides is 12mm.
One group of venetian blind type inspissator all is set in ipper air chamber and the lower air chamber, and every group of venetian blind type inspissator comprises the blade that a plurality of horizontal directions are extended, and realizes in vertical direction the concentrated acceleration to wind powder air-flow.Start vane also has the oblique lower lee face that tilts towards the downstream, because the existence of lee face, after the primary wind and powder airflow passes start vane, the flow section gradual change is compared with existing sudden expansion section, and the vortex region of formation reduces greatly, and loss coefficient reduces.The present invention is equivalent to two single concentration coal burners stacked up and down, and the dense powder air-flow of two single concentration coal burners converges at nozzle, has relatively improved the coal powder density in the dense powder stream, reduces NO
XGrowing amount, two single concentration coal burners act on the nozzle stack to entrainmenting of high-temperature flue gas, and are stronger to the effect of entrainmenting of high-temperature flue gas, and coal dust firing stability strengthens.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail:
Fig. 1 is for having the top view after shutter Horizontal burner level is dissectd now.
Fig. 2 is the structural representation after the present invention vertically dissects.
Among the figure: 1 airducts, 2 start vane, 3 intermediate blades, 4 end of a period blades, 5 surrounding airs, 6 horizontal baffles, 7 ipper air chamber, 8 lower air chamber, 21 windward sides, 22 lee faces, 42 level boards, 31 airducts, 32 start vane, 33 intermediate blades, 34 end of a period blades.
The specific embodiment
As shown in Figure 2, a kind of low NO
XConcentration coal burner, comprise airduct 1 one time, the horizontal baffle 6 that airduct is divided into ipper air chamber 7 and lower air chamber 8 is set in this airduct, one group of venetian blind type inspissator all is set in ipper air chamber and the lower air chamber, the venetian blind type inspissator that is positioned at lower air chamber comprises the blade that a plurality of horizontal directions are extended, take the flow direction of primary wind and powder air-flow as reference direction, be from upstream to the downstream, blade is respectively start vane 2, some intermediate blades 3 and end of a period blade 4, it is flat that intermediate blade is, the incline direction of start vane windward side 21 and intermediate blade is consistent all obliquely towards the downstream, start vane also has the oblique lower lee face 22 that tilts towards the downstream, and the end of a period blade lean is downwards towards the downstream; The venetian blind type inspissator that is positioned at ipper air chamber comprises the start vane identical with the venetian blind type inspissator structure of lower air chamber, some intermediate blades and end of a period blade, and the venetian blind type inspissator respective vanes of they and lower air chamber is symmetrical arranged take horizontal baffle as the plane of symmetry.
Particularly, described start vane is the solid fin that is fixed on lower air chamber's base plate or the ipper air chamber's top board.
Described intermediate blade is 3, according to reference direction, is respectively first order intermediate blade, second level intermediate blade and third level intermediate blade, has the sleeve configuration narrow slit that along continuous straight runs extends on first order intermediate blade and the second level intermediate blade.Preferably, the narrow slit on described first order intermediate blade and the second level intermediate blade is one, and is suitable with intermediate blade horizontal-extending length.Offer the sleeve configuration narrow slit at first order intermediate blade and second level intermediate blade, be equivalent to each blade is divided into little two of streamwise size.In the situation of identical Reynolds number Re, the area approximation of vortex region in square being directly proportional of blade streamwise size, the vortex region area of each vanelets will be about 1/4 of a large blade like this, the vortex region area sum of two vanelets also only is about original half, reduced the flow through local flow resistance of intermediate blade of wind powder, reduce the deposition of wind powder behind intermediate blade, avoided the generation of chute blockage accident.
Preferably, described slit width is 15-20mm.
The downstream side of described end of a period blade horizontal direction towards downstream extends to form level board 42.Breeze airflow is when flowing through the end of a period blade, and area of passage increases suddenly, the Speed Reduction of breeze airflow, and pressure drop, the pressure of nozzle exit is low than the pressure of surrounding environment, forms the recirculating zone, entrainments high-temperature flue gas, improves the pyrolysis effect of coal dust.The level board of end of a period blade carries out certain restriction to the diffusion of wind powder air-flow, and the size with the control recirculating zone is kept less than 1 the excess air coefficient in the breeze airflow, to suppress NO
XGeneration.
The spout of this burner also arranges surrounding air 5.Preferably, the described surrounding air width that is positioned at the spout upper and lower sides is 14mm, and the surrounding air width of left and right sides is 12mm.
Claims (8)
1. low NO
XConcentration coal burner, comprise airduct one time, it is characterized in that: the horizontal baffle that airduct is divided into ipper air chamber and lower air chamber is set in this airduct, one group of venetian blind type inspissator all is set in ipper air chamber and the lower air chamber, the venetian blind type inspissator that is positioned at lower air chamber comprises the blade that a plurality of horizontal directions are extended, take the flow direction of primary wind and powder air-flow as reference direction, be from upstream to the downstream, blade is respectively start vane, some intermediate blades and end of a period blade, it is flat that intermediate blade is, the incline direction of start vane windward side and intermediate blade is consistent all obliquely towards the downstream, start vane also has the oblique lower lee face that tilts towards the downstream, and the end of a period blade lean is downwards towards the downstream; The venetian blind type inspissator that is positioned at ipper air chamber comprises start vane, some intermediate blades and end of a period blade equally, and the venetian blind type inspissator respective vanes of they and lower air chamber is symmetrical arranged take horizontal baffle as the plane of symmetry.
2. low NO according to claim 1
XConcentration coal burner is characterized in that: described start vane is the solid fin that is fixed on lower air chamber's base plate or the ipper air chamber's top board.
3. low NO according to claim 1
XConcentration coal burner, it is characterized in that: described intermediate blade is 3, according to reference direction, be respectively first order intermediate blade, second level intermediate blade and third level intermediate blade, have the sleeve configuration narrow slit that along continuous straight runs extends on first order intermediate blade and the second level intermediate blade.
4. low NO according to claim 3
XConcentration coal burner is characterized in that: the narrow slit on described first order intermediate blade and the second level intermediate blade is one, and is suitable with intermediate blade horizontal-extending length.
5. according to claim 3 or 4 described low NO
XConcentration coal burner is characterized in that: described slit width is 15-20mm.
6. low NO according to claim 1
XConcentration coal burner is characterized in that: the downstream side of described end of a period blade horizontal direction towards downstream extends to form level board.
7. low NO according to claim 1
XConcentration coal burner is characterized in that: the spout of this burner also arranges surrounding air.
8. low NO according to claim 7
XConcentration coal burner is characterized in that: the described surrounding air width that is positioned at the spout upper and lower sides is 14mm, and the surrounding air width of left and right sides is 12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104452704A CN102927568A (en) | 2012-11-09 | 2012-11-09 | Dense-diluted pulverized coal burner with low NOX |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104452704A CN102927568A (en) | 2012-11-09 | 2012-11-09 | Dense-diluted pulverized coal burner with low NOX |
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| CN102927568A true CN102927568A (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104452704A Pending CN102927568A (en) | 2012-11-09 | 2012-11-09 | Dense-diluted pulverized coal burner with low NOX |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109442396A (en) * | 2018-11-28 | 2019-03-08 | 华北电力大学 | A kind of horizontal and Louver type concentrated diluted pulverized coal burner |
| CN109442396B (en) * | 2018-11-28 | 2024-06-04 | 华北电力大学 | Shutter type horizontal thick and thin pulverized coal burner |
Citations (7)
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|---|---|---|---|---|
| JPH01217110A (en) * | 1988-02-23 | 1989-08-30 | Babcock Hitachi Kk | Pulverized coal burner |
| CN2253800Y (en) * | 1995-08-18 | 1997-05-07 | 哈尔滨锅炉有限责任公司 | Concentration type self-stabilizing coal powder burner |
| JPH10318504A (en) * | 1997-05-16 | 1998-12-04 | Babcock Hitachi Kk | High capacity pulverized solid fuel burner |
| CN2705711Y (en) * | 2004-01-12 | 2005-06-22 | 自贡东方锅炉科技开发有限公司 | Coal powder concentrator using hill and open blade |
| CN201302156Y (en) * | 2008-11-07 | 2009-09-02 | 浙江大学 | External combustion type pulverized coal burner which has the characteristics of tiny-oil ignition and ultra-low load stable combustion |
| CN202371709U (en) * | 2011-10-25 | 2012-08-08 | 上海锅炉厂有限公司 | Concentrator used for pulverized coal burner of power station boiler |
| CN202902272U (en) * | 2012-11-09 | 2013-04-24 | 济南海普电力节能科技有限公司 | Low-NOX-content rich-lean pulverized coal burner |
-
2012
- 2012-11-09 CN CN2012104452704A patent/CN102927568A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01217110A (en) * | 1988-02-23 | 1989-08-30 | Babcock Hitachi Kk | Pulverized coal burner |
| CN2253800Y (en) * | 1995-08-18 | 1997-05-07 | 哈尔滨锅炉有限责任公司 | Concentration type self-stabilizing coal powder burner |
| JPH10318504A (en) * | 1997-05-16 | 1998-12-04 | Babcock Hitachi Kk | High capacity pulverized solid fuel burner |
| CN2705711Y (en) * | 2004-01-12 | 2005-06-22 | 自贡东方锅炉科技开发有限公司 | Coal powder concentrator using hill and open blade |
| CN201302156Y (en) * | 2008-11-07 | 2009-09-02 | 浙江大学 | External combustion type pulverized coal burner which has the characteristics of tiny-oil ignition and ultra-low load stable combustion |
| CN202371709U (en) * | 2011-10-25 | 2012-08-08 | 上海锅炉厂有限公司 | Concentrator used for pulverized coal burner of power station boiler |
| CN202902272U (en) * | 2012-11-09 | 2013-04-24 | 济南海普电力节能科技有限公司 | Low-NOX-content rich-lean pulverized coal burner |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109442396A (en) * | 2018-11-28 | 2019-03-08 | 华北电力大学 | A kind of horizontal and Louver type concentrated diluted pulverized coal burner |
| CN109442396B (en) * | 2018-11-28 | 2024-06-04 | 华北电力大学 | Shutter type horizontal thick and thin pulverized coal burner |
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Owner name: SHANDONG YINGDIAN ENERGY SAVING TECHNOLOGY CO., LT Free format text: FORMER OWNER: JI NAN HIPOWER TECHNOLOGY CO., LTD. Effective date: 20140410 |
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Effective date of registration: 20140410 Address after: 250000 Shandong city of Ji'nan province high tech Zone Shun Road No. 1 Building No. 5, Qilu Software Park (Business Plaza E block, room A515) Applicant after: SHANDONG ECO-POWER ENERGY SAVING SCIENCE & TECHNOLOGY CO., LTD. Address before: 250101 Shandong Province, Ji'nan City Xinyu High-tech Development Zone on the west side of the road century wealth center block AB room 602 Applicant before: Jinan Hipower Technology Co., Ltd. |
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Application publication date: 20130213 |