CN103759259B - Strengthening classification low-NOx pulverized coal burner - Google Patents
Strengthening classification low-NOx pulverized coal burner Download PDFInfo
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- CN103759259B CN103759259B CN201410013039.7A CN201410013039A CN103759259B CN 103759259 B CN103759259 B CN 103759259B CN 201410013039 A CN201410013039 A CN 201410013039A CN 103759259 B CN103759259 B CN 103759259B
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- air
- air passage
- coal dust
- direct current
- passage
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/06041—Staged supply of oxidant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/10—Nozzle tips
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
- F23D2201/20—Fuel flow guiding devices
Abstract
A kind of strengthening classification low-NOx pulverized coal burner, including First air passage, direct current inner second air road and eddy flow inner second air road, coal dust is separated into interior dense outer light structure at nozzle and sprays into burner hearth by coal dust current equalizer and coal dust classifier by arranging in First air passage; Inner second air is divided into direct current wind entrance and Whirl deposite tank entrance, sprays into burner hearth in air channel after mixing, is controlled the air quantity of direct current wind by pull bar, such that it is able to control the swirl strength of inner second air. One secondary wind exit is respectively provided with the spout reamer structure of certain angle, effectively control secondary wind to mix with the in good time of coal dust, make spout water-cooling wall be chronically in oxidizing atmosphere simultaneously, the slagging scorification and the high temperature corrosion that effectively prevent burner region water-cooling wall occur, this invention has the strong combustion stability that catches fire, regulating performance good, coal adaptability is strong, and has low-nitrogen oxide discharging feature simultaneously.
Description
Technical field
The present invention relates to Utility Boiler Technology field, particularly a kind of strengthening classification low-NOx pulverized coal burner suitable in coal-burning boiler.
Background technology
Along with the increasingly stringent that station boiler discharged nitrous oxides is controlled by country, the combustion system technology of a kind of complete supporting low-NOx combustor of burner hearth air classification is widely applied, and defines low NOx cyclone and the DC burner technology of various school.
For the wall boiler that liquidates, for making nitrogen oxides effectively be reduced in stove, full burner hearth fractional combustion low NOx drainage technology adopts and the whole air (oxygen amount) required for being supplied in stove coal dust after-flame is divided into two parts, portion of air sprays into burner hearth from lower hearth main burner spout, meets the coal dust required oxygen amount of early stage burning; And another part air is from upper furnace air port (after-flame air port) burner hearth of making a gift to someone, make the aerochemistry equivalent proportion in primary zone less than 1.
But, applying above-mentioned technology with while meeting National Pollutant reduction of discharging requirement, when being especially applicable to the transformation of former conventional burners, the problem that current ubiquity is conflicting: after 1, adopting the low-NOx combustor of fractional combustion, often bring combustion-delaying, thus bringing fly ash combustible material higher. 2, according to strengthening early stage coal powder ignition and not adopting fractional combustion solution fly ash combustible material higher, bring again NOx higher. Both is difficult to balance, and in actual transformation, generally requires and obtain an appropriate equilibrium point in NOx and fly ash combustible material are higher, namely in the acceptable degree of fly ash combustible material, tries one's best and reduces the discharge of NOx.
Summary of the invention
Technical problem: it is an object of the invention to for the deficiency in prior art, it is provided that a kind of compact conformation, the strengthening classification low-NOx pulverized coal burner that easy to adjust, strong adaptability, result of use are good.
Technical scheme: the strengthening classification low-NOx pulverized coal burner of the present invention, including First air passage, it is located at the coal dust current equalizer in First air feeder connection, described First air channels peripheral is set with direct current inner second air passage, the outer wall of direct current inner second air passage is provided with the eddy flow inner second air passage spraying into burner hearth after being compiled in same passage, described First air channel exit is provided with coal dust classifier, described direct current inner second air passage is provided with the pull bar of damper intake, direct current inner second air channel rear portion periphery is set with eddy flow outer second air passage, eddy flow outer second air feeder connection place is provided with the adjustment device that can outer second air swirl vane be adjusted, the enlarging cone angle of First air passage air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage air outlet enlarging cone angle gamma be 40-45 °.
Described coal dust classifier is a cylindrical annular channel, and channel outer wall is furnished with wind blade, and channel is cast by high-abrasive material or constituted by inlaying high-abrasive material inside and outside common iron.
The described device that regulates includes one group of rotatable blade along eddy flow outer second air passage inner periphery arranged tangential, the bent axle regulating blade oscillating direction and the drive connecting rod axle composition being connected on bent axle.
Beneficial effect: the present invention can regulate the mutual relation of NOx and fly ash combustible material, reaches preferred values mutually. When fly ash combustible material is higher, by unlatching eddy flow inner second air passage and increase swirl secondary air air quantity, improve the swirl strength of whole air-flow, the mixing of strengthening coal dust and air, strengthening early stage burning, make fly ash combustible material be reduced. When NOx emission is higher, reduces eddy flow inner second air air quantity and strengthen non-swirl secondary air air quantity, making the mixing of secondary wind and pulverized coal flame weaken, delayed combustion. By adjusting the air quantity of eddy flow inner second air and direct current inner second air, the mixing adjusting secondary wind and pulverized coal flame adjusts burning, thus reaching the relatively low NOx of transformation boiler and acceptable fly ash combustible material. Coal adaptability of the present invention is strong. For the different coal dust current equalizers of coal design uniqueness, coal dust classifier. Regulate device by inner second air adjusting rod and outer second air simultaneously, the air quantity of outer second air and/or swirl strength in scalable, control the mixing opportunity of burner nozzle central high temperature smoke backflow district and a secondary wind, to adapt to catching fire and surely firing requirement of Coal rank. Its simple in construction, the combustion stability that catches fire is good, regulates performance good simultaneously, and coal adaptability is strong, and has low-nitrogen oxide discharging feature.
Accompanying drawing explanation
Fig. 1 is that the present invention strengthens classification low-NOx pulverized coal burner structural representation.
In figure: 1 First air passage, 2 direct current inner second air passages, 3 eddy flow inner second air passages, 4 eddy flow outer second air passages, 5 coal dust current equalizers, 6 coal dust classifiers, 7 expand vertebra, 8 pull bars, and 9 regulate device.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention is further described:
The strengthening classification low-NOx pulverized coal burner of the present invention, is mainly made up of First air passage 1, direct current inner second air passage 2, eddy flow inner second air passage 3, eddy flow outer second air passage 4, coal dust current equalizer 5, coal dust classifier 6, in First air passage 1 straight length, inlet side arranges coal dust current equalizer 5, outlet side arranges coal dust classifier 6, First air passage 1 periphery is set with direct current inner second air passage 2, the outer wall of direct current inner second air passage 2 is provided with the eddy flow inner second air passage 3 spraying into burner hearth after being compiled in same passage, described First air passage 1 exit is provided with coal dust classifier 6, described coal dust classifier 6 is a cylindrical annular channel, channel outer wall is furnished with wind blade, channel is cast by high-abrasive material or is constituted by inlaying high-abrasive material inside and outside common iron, when breeze airflow is after coal dust current equalizer 5 leads, concentrated phase air-flow enters inside coal dust classifier, and light phase air-flow flows through outside coal dust classifier. described direct current inner second air passage 2 is provided with the pull bar 8 of damper intake, direct current inner second air passage 2 back periphery is set with eddy flow outer second air passage 4, and eddy flow outer second air passage 4 porch is provided with the adjustment device 9 that can outer second air swirl vane be adjusted,The described device 9 that regulates includes one group of rotatable blade along eddy flow outer second air passage 4 inner periphery arranged tangential, the bent axle regulating blade oscillating direction and the drive connecting rod axle composition being connected on bent axle, when rotating drive connecting rod axle, all of blade rotates along same direction with identical angle, thus the air-flow guiding entering this blade being formed swirling eddy enter burner hearth. The enlarging cone angle of described First air passage 1 air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage 4 air outlet enlarging cone angle gamma be 40-45 °.
Operation principle: First air/breeze airflow of the present invention is entered by the elbow of a ventilating duct 1, under the effect of the coal dust current equalizer 5 of First air passage 1 straight length entrance layout, owing to effect of inertia makes coal dust produce concentration, in primary air piping, form dense, light coal powder density distributed architecture, and make the breeze airflow of variable concentrations spray into burner hearth from center and surrounding respectively by being arranged in the coal dust classifier 6 of the straight length outlet of a ventilation shaft 1. After non-swirl secondary air passage 2 and eddy flow inner second air passage 3, after shared pathway mixes, spray into burner hearth by inner second air spout. Outer second air, after outer second air air register, produces rotate and spray into burner hearth through outer second air passage. By former single inner second air passage being divided into the dual pathways, and it is respectively set to direct current inner second air and Whirl deposite tank inner second air passage, and collects in feeding burner hearth in inner second air passage, be mixed into breeze airflow and participate in burning. When fly ash combustible material is higher, by opening eddy flow inner second air passage and increasing swirl secondary air air quantity, improve the swirl strength of whole air-flow, the mixing of strengthening coal dust and air, strengthening early stage burning, make fly ash combustible material be reduced. When NOx emission is higher, reduces eddy flow inner second air air quantity and strengthen non-swirl secondary air air quantity, making the mixing of secondary wind and pulverized coal flame weaken, delayed combustion. By adjusting the air quantity of eddy flow inner second air and direct current inner second air, the mixing adjusting secondary wind and pulverized coal flame adjusts burning, thus reaching the relatively low NOx of transformation boiler and acceptable fly ash combustible material. Inside and outside overfire air port is all provided with adjusting yoke, and eddy flow inner second air is tangential vane structure, by the air quantity of pull bar 8 scalable inner second air; Eddy flow outer second air is tangential vane structure, by regulating device 9, the swirl strength of outer second air can be regulated, thus can in the burner gains in depth of comprehension to rational high temperature gases recirculating district, and control in good time mixing of primary and secondary air, make center high concentration pulverized coal quick ignition in high temperature gases recirculating district, burning, consume rapidly internal oxygen amount, make burner reach the purpose of the efficient after-flame of coal dust while early stage anoxycausis nitrogen oxides reduction.
Claims (1)
1. a strengthening classification low-NOx pulverized coal burner, including First air passage (1), it is located at the coal dust current equalizer (5) in First air passage (1) entrance, described First air passage (1) periphery is set with direct current inner second air passage (2), the outer wall of direct current inner second air passage (2) is provided with eddy flow inner second air passage (3) spraying into burner hearth after being compiled in same passage, it is characterized in that: described First air passage (1) exit is provided with coal dust classifier (6), described coal dust classifier (6) is a cylindrical annular channel, channel outer wall is furnished with wind blade, channel is cast by high-abrasive material or is constituted by inlaying high-abrasive material inside and outside common iron,Described direct current inner second air passage (2) is provided with pull bar (8), and inside and outside overfire air port is all provided with adjusting yoke, and inner second air swirl vane is tangential vane structure, by the air quantity of pull bar (8) scalable inner second air; Direct current inner second air passage (2) back periphery is set with eddy flow outer second air passage (4), and eddy flow outer second air passage (4) porch is provided with the adjustment device (9) that can outer second air swirl vane be adjusted; Outer second air swirl vane is tangential vane structure, by regulate device (9), it is possible to regulate outer second air swirl strength, thus can in the burner gains in depth of comprehension to rational high temperature gases recirculating district;
Described adjustment device (9) includes one group of rotatable blade along eddy flow outer second air passage (4) inner periphery arranged tangential, the bent axle regulating blade oscillating direction and the drive connecting rod axle being connected on bent axle; The enlarging cone angle of First air passage (1) air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage (4) air outlet enlarging cone angle gamma be 40-45 °; First air/breeze airflow is entered by the elbow of First air passage (1), under the effect of the coal dust current equalizer (5) of First air passage (1) straight length entrance layout, owing to effect of inertia makes coal dust produce concentration, in primary air piping, form dense, light coal powder density distributed architecture, and make the breeze airflow of variable concentrations spray into burner hearth from center and surrounding respectively by being arranged in the coal dust classifier (6) of the straight length outlet of First air passage (1); After direct current inner second air passage (2) and eddy flow inner second air passage (3), after shared pathway mixes, spray into burner hearth by inner second air spout; Outer second air, after outer second air air register, produces rotate and spray into burner hearth through outer second air passage; By former single inner second air passage is divided into the dual pathways, it is respectively set to direct current inner second air and Whirl deposite tank inner second air passage, and collects in feeding burner hearth in inner second air passage, be mixed into breeze airflow and participate in burning;
When NOx emission is higher, reduces eddy flow inner second air air quantity and strengthen direct current inner second air air quantity, making the mixing of secondary wind and pulverized coal flame weaken, delayed combustion; By adjusting the air quantity of eddy flow inner second air and direct current inner second air, the mixing adjusting secondary wind and pulverized coal flame adjusts burning, thus reaching the relatively low NOx of transformation boiler and acceptable fly ash combustible material; Inside and outside overfire air port is all provided with adjusting yoke, and inner second air swirl vane is tangential vane structure, by the air quantity of pull bar (8) scalable inner second air; Outer second air is swirl vane tangential vane structure, by regulating device (9), the swirl strength of outer second air can be regulated, thus can in the burner gains in depth of comprehension to rational high temperature gases recirculating district, and control in good time mixing of primary and secondary air, make center high concentration pulverized coal quick ignition in high temperature gases recirculating district, burning, consume rapidly internal oxygen amount, make burner reach the purpose of the efficient after-flame of coal dust while early stage anoxycausis nitrogen oxides reduction.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013039.7A CN103759259B (en) | 2014-01-13 | 2014-01-13 | Strengthening classification low-NOx pulverized coal burner |
| PCT/CN2014/077207 WO2015103832A1 (en) | 2014-01-13 | 2014-05-12 | Classification strengthened low nox pulverized coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013039.7A CN103759259B (en) | 2014-01-13 | 2014-01-13 | Strengthening classification low-NOx pulverized coal burner |
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| Publication Number | Publication Date |
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| CN103759259A CN103759259A (en) | 2014-04-30 |
| CN103759259B true CN103759259B (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410013039.7A Active CN103759259B (en) | 2014-01-13 | 2014-01-13 | Strengthening classification low-NOx pulverized coal burner |
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| Country | Link |
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| CN (1) | CN103759259B (en) |
| WO (1) | WO2015103832A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759259B (en) * | 2014-01-13 | 2016-06-15 | 徐州科融环境资源股份有限公司 | Strengthening classification low-NOx pulverized coal burner |
| GB2551167A (en) * | 2016-06-08 | 2017-12-13 | Doosan Babcock Ltd | Burner |
| CN106224949B (en) * | 2016-08-24 | 2018-04-24 | 东南大学 | A kind of non-coaxial horizontal bias low NOx DC coal burner |
| CN106352331A (en) * | 2016-08-25 | 2017-01-25 | 施政 | Pulverized coal combustion system |
| CN109764334A (en) * | 2019-01-24 | 2019-05-17 | 东方电气集团东方锅炉股份有限公司 | Low Nox coke oven gas burner |
| CN109737393B (en) * | 2019-02-19 | 2024-02-27 | 沈阳环境科学研究院 | Large coal powder concentration ratio postpone mixed type cyclone coal powder burner |
| CN110242952A (en) * | 2019-05-30 | 2019-09-17 | 国电浙江北仑第一发电有限公司 | A kind of low cooling air quantity burner using composite material spout |
| CN110360548B (en) * | 2019-08-01 | 2020-07-14 | 沈阳航空航天大学 | Low NOx combustor based on plasma excitation staged combustion enhancement |
| CN111998336B (en) * | 2020-09-14 | 2022-07-26 | 哈尔滨锅炉厂有限责任公司 | Direct-flow pulverized coal burner with thick outer part and thin inner part |
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2014
- 2014-01-13 CN CN201410013039.7A patent/CN103759259B/en active Active
- 2014-05-12 WO PCT/CN2014/077207 patent/WO2015103832A1/en active Application Filing
Patent Citations (5)
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| EP2597367A1 (en) * | 2011-05-27 | 2013-05-29 | Shanghai Boiler Works, Ltd. | Dense-phase swirl pulverized coal burner |
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| Publication number | Publication date |
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| WO2015103832A1 (en) | 2015-07-16 |
| CN103759259A (en) | 2014-04-30 |
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