CN103759259A - Intensive-classification low-NOx pulverized coal burner - Google Patents

Intensive-classification low-NOx pulverized coal burner Download PDF

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Publication number
CN103759259A
CN103759259A CN201410013039.7A CN201410013039A CN103759259A CN 103759259 A CN103759259 A CN 103759259A CN 201410013039 A CN201410013039 A CN 201410013039A CN 103759259 A CN103759259 A CN 103759259A
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China
Prior art keywords
air passage
air
passage
pulverized coal
secondary air
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CN201410013039.7A
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CN103759259B (en
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程怀志
高克迎
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XUZHOU COMBUSTION CONTROL RESEARCH INSTITUTE Co Ltd
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XUZHOU COMBUSTION CONTROL RESEARCH INSTITUTE Co Ltd
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Publication of CN103759259A publication Critical patent/CN103759259A/en
Priority to PCT/CN2014/077207 priority patent/WO2015103832A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • F23D1/02Vortex burners, e.g. for cyclone-type combustion apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/06041Staged supply of oxidant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2201/00Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10Nozzle tips
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2201/00Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/20Fuel flow guiding devices

Abstract

An intensive-classification low-NOx pulverized coal burner comprises a primary air passage, a direct-flow inner secondary air passage and a cyclone inner secondary air passage; pulverized coal is separated by a coal flow equalizer and a pulverized coal separator disposed in the primary air passage into thick-inside thin-outside structure at a spout, blown into a hearth; the inner secondary air passage is provided with a direct-flow air inlet and a cyclone air inlet; secondary air is mixed in the inner secondary air passage and spayed into the hearth; volume of the direct-flow air is controlled through a pull rod, so that cyclone strength of the inner secondary air can be controlled. Each of primary and secondary air outlets is provided with a certainly angular spout expanded-cone structure, real-time mixing of the secondary air and the pulverized coal is effectively controlled, a spout water-cooling wall is in the oxidization atmosphere in a long period of time meanwhile, and slag buildup and high temperature corrosion can be effectively prevented for the water-cooling wall in a burner area. The intensive-classification low-NOx pulverized coal burner has the advantages that combustion stability is high, adjusting performance is good, the burner is well adaptable to various coals, and emission of nitric oxide is low.

Description

Strengthening classification low-NOx pulverized coal burner
Technical field
The present invention relates to Utility Boiler Technology field, particularly a kind of strengthening classification low-NOx pulverized coal burner that is applicable to coal-burning boiler.
Background technology
Along with the increasingly stringent of country to the control of station boiler discharged nitrous oxides, the combustion system technology of the supporting low-NOx combustor of a kind of full burner hearth air classification is widely applied, and has formed low NOx cyclone and the DC burner technology of various schools.
With regard to the wall formula boiler that liquidates, for nitrogen oxide is effectively reduced in stove, full burner hearth fractional combustion low NOx drainage technology adopts being supplied to the needed whole air of coal dust after-flame (oxygen amount) in stove to be divided into two parts, portion of air sprays into burner hearth from lower hearth main burner spout, meets the coal dust requisite oxygen amount of burning in early days; 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 be less than 1.
But, application above-mentioned technology with when meeting national pollution reduction requirement, while being particularly applied to the transformation of former conventional burners, the conflicting problem of ubiquity at present: 1, adopt after the low-NOx combustor of fractional combustion, tend to bring combustion-delaying, thereby bring fly ash combustible material higher.If 2 adopt strengthening coal powder ignition in early stage and do not adopt fractional combustion solution fly ash combustible material higher, bring again NOx higher.These two very difficult balance, and in actual transformation, often need to obtain an appropriate equalization point aspect higher at NOx and fly ash combustible material,, in the acceptable degree of fly ash combustible material, reduces the discharge of NOx as far as possible.
Summary of the invention
Technical problem: the object of the invention is for the deficiency in prior art, a kind of compact conformation, easy to adjust, strong adaptability, strengthening classification low-NOx pulverized coal burner that result of use is good are provided.
Technical scheme: strengthening classification low-NOx pulverized coal burner of the present invention, comprise wind passage one time, be located at the coal dust current equalizer in wind feeder connection one time, a described wind passage outer race is equipped with direct current inner second air passage, the outer wall of direct current inner second air passage is provided with and is compiled in the eddy flow inner second air passage that sprays into burner hearth after same passage, a described wind 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 outer race is equipped with eddy flow outer second air passage, eddy flow outer second air feeder connection place is provided with the adjusting device that can regulate outer second air swirl vane, the enlarging cone angle gamma of the enlarging cone angle of a wind passage air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage air outlet is 40-45 °.
Described coal dust classifier is a cylindrical annular tube channel, on tube channel outer wall, is furnished with wind blade, and tube channel is cast by high-abrasive material or formed by inlaying high-abrasive material inside and outside common iron.
Described adjusting device comprises along the bent axle of one group of rotatable blade of eddy flow outer second air passage inner periphery arranged tangential, adjusting vane swaying direction and is connected to the drive connecting rod axle formation on bent axle.
Beneficial effect: the present invention can regulate the correlation of NOx and fly ash combustible material, reaches preferred values mutually.When fly ash combustible material is higher, will open 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 burning in early stage, is reduced fly ash combustible material.When NOx discharges when higher, reduce eddy flow inner second air air quantity and also strengthen direct-current secondary wind air quantity, the mixing of Secondary Air and pulverized coal flame is weakened, delayed combustion.By adjusting the air quantity of eddy flow inner second air and direct current inner second air, adjust the mixing of Secondary Air and pulverized coal flame and adjust burning, thereby reach lower NOx and the acceptable fly ash combustible material of transformation boiler.Coal adaptability of the present invention is strong.For different coals, design unique coal dust current equalizer, coal dust classifier.Simultaneously by inner second air adjusting rod and outer second air adjusting device, the air quantity of adjustable interior outer second air and/or swirl strength, the mixing opportunity of high temperature gases recirculating district, control combustion device spout center and a Secondary Air, to adapt to the ignition and steady combustion requirement of Coal rank.It is simple in structure, and the combustion stability that catches fire is good, and adjusting function is 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-wind passage, 2-direct current inner second air passage, 3-eddy flow inner second air passage, 4-eddy flow outer second air passage, 5-coal dust current equalizer, 6-coal dust classifier, 7-expansion vertebra, 8-pull bar, 9-adjusting device.
The specific embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Strengthening classification low-NOx pulverized coal burner of the present invention, mainly consists of wind 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, a coal dust classifier 6, in wind passage 1 straight length, inlet side arranges coal dust current equalizer 5, export a side coal dust classifier 6 is set, one time wind passage 1 outer race is equipped with direct current inner second air passage 2, the outer wall of direct current inner second air passage 2 is provided with and is compiled in the eddy flow inner second air passage 3 that sprays into burner hearth after same passage, described wind passage 1 exit is provided with coal dust classifier 6, described coal dust classifier 6 is a cylindrical annular tube channel, on tube channel outer wall, be furnished with wind blade, tube channel is cast by high-abrasive material or is formed by inlaying high-abrasive material inside and outside common iron, when breeze airflow is after coal dust current equalizer 5 guiding, concentrated phase air-flow enters coal dust classifier inner side, and light phase air-flow flows through from coal dust classifier outside.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 are set with eddy flow outer second air passage 4, and eddy flow outer second air passage 4 porch are provided with the adjusting device 9 that can regulate outer second air swirl vane; Described adjusting device 9 comprises along the bent axle of one group of rotatable blade of eddy flow outer second air passage 4 inner periphery arranged tangential, adjusting vane swaying direction and is connected to the drive connecting rod axle formation on bent axle, when rotating drive connecting rod axle, all blades with identical angle rotation, enter burner hearth thereby the air-flow guiding that enters this blade is formed to swirling eddy along same direction.The enlarging cone angle gamma of the enlarging cone angle of described wind passage 1 air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage 4 air outlets is 40-45 °.
Operation principle: wind/breeze airflow of the present invention enters by the elbow of a ventilating duct 1, under the effect of the coal dust current equalizer 5 of arranging at wind passage 1 straight length entrance, because producing coal dust, effect of inertia concentrates, in an airduct, form dense, light coal powder density distributed architecture, and the coal dust classifier 6 of the straight length outlet by being arranged in a ventilation shaft 1 makes the breeze airflow of variable concentrations from center and surrounding, spray into burner hearth respectively.After direct-current secondary wind passage 2 and eddy flow inner second air passage 3, after mixing, shared pathway sprays into burner hearth by inner second air spout.Outer second air, after outer second air air register, produces rotation and sprays into burner hearth through outer second air passage.By former single inner second air passage is divided into binary channels, and be set to respectively direct current inner second air and eddy flow wind inner second air passage, and collect in inner second air passage and send into burner hearth, sneak 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 burning in early stage, is reduced fly ash combustible material.When NOx discharges when higher, reduce eddy flow inner second air air quantity and also strengthen direct-current secondary wind air quantity, the mixing of Secondary Air and pulverized coal flame is weakened, delayed combustion.By adjusting the air quantity of eddy flow inner second air and direct current inner second air, adjust the mixing of Secondary Air and pulverized coal flame and adjust burning, thereby reach lower NOx and the acceptable fly ash combustible material of transformation boiler.Inside and outside overfire air port is all furnished with adjusting yoke, and eddy flow inner second air is tangential vane structure, by the air quantity of pull bar 8 adjustable inner second airs; Eddy flow outer second air is tangential vane structure, by adjusting device 9, can regulate the swirl strength of outer second air, thereby can obtain at burner center rational high temperature gases recirculating district, and control the 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 inner oxygen amount, make burner in early stage, in anoxycausis nitrogen oxides reduction, reach the object of the efficient after-flame of coal dust.

Claims (3)

1. a strengthening classification low-NOx pulverized coal burner, comprise a wind passage (1), be located at the coal dust current equalizer (5) in a wind passage (1) entrance, a described wind passage (1) outer race is equipped with direct current inner second air passage (2), the outer wall of direct current inner second air passage (2) is provided with and is compiled in the eddy flow inner second air passage (3) that sprays into burner hearth after same passage, it is characterized in that: a described wind passage (1) exit is provided with coal dust classifier (6), 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), eddy flow outer second air passage (4) porch is provided with the adjusting device (9) that can regulate outer second air swirl vane, the enlarging cone angle gamma of the enlarging cone angle of a wind passage (1) air outlet, inner second air passage air outlet sleeve enlarging cone angle beta, outer second air passage (4) air outlet is 40-45 °.
2. strengthening classification low-NOx pulverized coal burner according to claim 1, it is characterized in that: described coal dust classifier (6) is a cylindrical annular tube channel, on tube channel outer wall, be furnished with wind blade, tube channel is cast by high-abrasive material or is formed by inlaying high-abrasive material inside and outside common iron.
3. strengthening classification low-NOx pulverized coal burner according to claim 1, is characterized in that: described adjusting device (9) comprises along the bent axle of one group of rotatable blade of eddy flow outer second air passage (4) inner periphery arranged tangential, adjusting vane swaying direction and is connected to the drive connecting rod axle formation on bent axle.
CN201410013039.7A 2014-01-13 2014-01-13 Strengthening classification low-NOx pulverized coal burner Active CN103759259B (en)

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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

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015103832A1 (en) * 2014-01-13 2015-07-16 徐州燃控科技股份有限公司 Classification strengthened low nox pulverized coal burner
CN106224949A (en) * 2016-08-24 2016-12-14 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
CN109737393A (en) * 2019-02-19 2019-05-10 沈阳环境科学研究院 Big Pulverized Coal Concentration is than postponing hybrid vortex 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
CN110360548A (en) * 2019-08-01 2019-10-22 沈阳航空航天大学 Low-NOx combustor based on plasma excitation classification overheavy firing
CN111998336A (en) * 2020-09-14 2020-11-27 哈尔滨锅炉厂有限责任公司 Direct-flow pulverized coal burner with thick outside and thin inside

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GB2551167A (en) * 2016-06-08 2017-12-13 Doosan Babcock Ltd Burner
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

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CN102393015A (en) * 2011-05-27 2012-03-28 上海锅炉厂有限公司 Dense-phase spiral-flow pulverized-coal burner
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CN201496957U (en) * 2009-07-31 2010-06-02 戴卫军 Cyclone pulverized coal burner
CN101832550A (en) * 2010-06-18 2010-09-15 上海交通大学 Swirl pulverized-coal burner based on multi-level pulverized-coal concentration
CN102062396A (en) * 2010-10-13 2011-05-18 西安交通大学 Composite concentration triple-wind-regulating low-NOx cyclone pulverized-coal burner
EP2597367A1 (en) * 2011-05-27 2013-05-29 Shanghai Boiler Works, Ltd. Dense-phase swirl pulverized coal burner
CN203718766U (en) * 2014-01-13 2014-07-16 徐州燃控科技股份有限公司 Classification strengthened low NOx pulverized coal combustor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015103832A1 (en) * 2014-01-13 2015-07-16 徐州燃控科技股份有限公司 Classification strengthened low nox pulverized coal burner
CN106224949A (en) * 2016-08-24 2016-12-14 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
CN109737393A (en) * 2019-02-19 2019-05-10 沈阳环境科学研究院 Big Pulverized Coal Concentration is than postponing hybrid vortex 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
CN110360548A (en) * 2019-08-01 2019-10-22 沈阳航空航天大学 Low-NOx combustor based on plasma excitation classification overheavy firing
CN111998336A (en) * 2020-09-14 2020-11-27 哈尔滨锅炉厂有限责任公司 Direct-flow pulverized coal burner with thick outside and thin inside
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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