CN100464118C - High temperature-and corrosion-protectal low NOx vortex burning device - Google Patents

High temperature-and corrosion-protectal low NOx vortex burning device Download PDF

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Publication number
CN100464118C
CN100464118C CNB2007100718159A CN200710071815A CN100464118C CN 100464118 C CN100464118 C CN 100464118C CN B2007100718159 A CNB2007100718159 A CN B2007100718159A CN 200710071815 A CN200710071815 A CN 200710071815A CN 100464118 C CN100464118 C CN 100464118C
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CN
China
Prior art keywords
cyclone
air
center
air duct
burner
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CNB2007100718159A
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Chinese (zh)
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CN101021315A (en
Inventor
李争起
靖剑平
陈智超
秦裕琨
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哈尔滨工业大学
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Publication of CN101021315A publication Critical patent/CN101021315A/en
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Publication of CN100464118C publication Critical patent/CN100464118C/en

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Abstract

The present invention relates to a low NOx cyclone combustion equipment capable of preventing high-temperature corrosion. It is characterized by that the invented side wall OFA nozzles are respectively set on the upper portion of two side walls in the furnace cavity interior, the furnace cavity zone where the side wall OFA nozzle lower-side central powder-feeding cyclone coal powder combustor is placed is main combustion zone, the furnace cavity zone where the side wall OFA nozzle and cyclone OFA nozzle are placed is burning zone, several central powder-feeding cyclone coal powder combustors are respectively set on the front and rear walls of main combustion zone side, and the cyclone OFA nozzles are respectively set on the front and rear walls of burning zone side. When the coal powder is combusted, it can further inhibit the formation of NOx, can reduce discharge of NOx by above 80%.

Description

A kind of low NOx vortex burning device that prevents high temperature corrosion
Technical field
The present invention relates to a kind of burner, particularly a kind of is the burner of fuel with the coal dust.
Background technology
In the big Capacity Power Plant Boilers of China's operation, the high temperature corrosion problem is serious day by day.After the water-cooling wall generation high temperature corrosion, wall thickness reduction, intensity reduces, and causes booster and leakage easily, jeopardizes safe operation of the boiler.The main cause that produces high temperature corrosion is exactly to present reducing atmosphere near the tube wall that is corroded.In recent years along with country to improving constantly that station boiler NOx discharge capacity requires, many big Capacity Power Plant Boilers have all adopted OFA (after-flame wind) technology, just realize the furnace air classification, reduce the NOx discharge capacity.After using OFA (after-flame wind) technology, primary combustion zone is in the combustion with meagre oxygen state, presents reducing atmosphere, when reducing the NOx discharge capacity, has but aggravated the high temperature corrosion at primary combustion zone water-cooling wall place.Turbulent burner occupies certain ratio at China's station boiler and other coal dust application.When reducing the NOx discharging in the large coal powder boiler of China's employing turbulent burner the safe operation that jeopardizes boiler the serious problem of high temperature corrosion appears.Therefore, the research low NOx cyclone combustion technology that prevents high temperature corrosion all is that crucial meaning is arranged to the development of China's power industry and whole national economy.
Summary of the invention
The objective of the invention is when reducing the NOx discharging, to occur the problem of high temperature corrosion, a kind of low NOx vortex burning device that prevents high temperature corrosion is provided for the large coal powder boiler that solves present employing turbulent burner.The present invention is made up of burner hearth, a plurality of centers powder-feeding cyclone burner for pulverized coal, front wall, side wall OFA spout, eddy flow OFA spout, burning-out zone, Hou Qiang, main combustion zone and two side walls; Form burner hearth between front wall, Hou Qiang and two side walls, it is characterized in that side wall OFA spout is arranged on the top of two side walls in the burner hearth, the burner hearth zone at powder-feeding cyclone burner for pulverized coal place, side wall OFA spout downside center is main combustion zone, the burner hearth zone at side wall OFA spout and eddy flow OFA spout place is a burning-out zone, a plurality of centers powder-feeding cyclone burner for pulverized coal is separately positioned on the front-back wall of main combustion zone one side, and eddy flow OFA spout is arranged on the front-back wall of burning-out zone one side; Eddy flow OFA spout is by the center secondary air duct, cyclone, the air door baffle plate, secondary air duct, the center overfire air port, overfire air port, outer overfire air port, outer secondary air channel, outer secondary wind cyclone and outer secondary wind air door baffle plate are formed, the center secondary air duct is fixed on front wall, on back wall or the side wall, overfire air port is arranged on center overfire air port one side of center secondary air duct, be fixed with cyclone between overfire air port and the center secondary air duct, the air door baffle plate is arranged on the outside of the overfire air port of cyclone one side, form secondary air duct between overfire air port and the center secondary air duct, outer overfire air port is fixed on the outside of overfire air port, outer secondary wind cyclone is fixed on the overfire air port of outer overfire air port air intake one side, outer secondary wind air door baffle plate is fixed on the outer secondary wind cyclone, forms outer secondary air channel between overfire air port and the outer overfire air port.
The invention has the beneficial effects as follows: after employing had the technical scheme of OFA (after-flame wind), main combustion zone excess air coefficient was in the combustion with meagre oxygen state less than 1, has suppressed the formation of main combustion zone fuel type NOx.But, adopt OFA (after-flame wind) technology can cause main combustion zone excess air coefficient less than 1, be in the combustion with meagre oxygen state, present reducing atmosphere, make OFA (after-flame wind) spout with lower area both walls and front-back wall water-cooling wall generation high temperature corrosion easily.On the both walls of burner hearth, offer OFA (after-flame wind) spout, can reduce the generation of NOx on the one hand, can destroy the reducing atmosphere of spout on the other hand, form oxidizing atmosphere, further prevent the generation of spout with lower area both walls water wall high temperature corrosion with lower area both walls water-cooling wall.The center powder-feeding cyclone burner for pulverized coal sprays into burner hearth with the thick coal culm air-flow over against recirculating zone, the center core of burner.The coal dust amount of therefore passing through the recirculating zone, center increases, and the crossing time of coal dust prolongs, and coal dust is burnt under reducing atmosphere, can effectively control the formation of fuel type NOx.Adopt OFA (after-flame wind) technology make the primary combustion zone excess air coefficient less than 1 situation under, can form stronger reducing atmosphere in the recirculating zone, center, coal dust can further suppress the generation of NOx under stronger reducing atmosphere when passing through the burning of recirculating zone, center.The center powder-feeding cyclone burner for pulverized coal concentrates on the thick coal culm air-flow at the center of burner, not having more coal dust is thrown on the burner hearth side water wall because of the rotation of secondary wind, guaranteed the oxidizing atmosphere at primary combustion zone side wall and front-back wall water-cooling wall place, even installing additional under OFA (after-flame wind) spout causes that the primary combustion zone excess air coefficient is less than 1 situation, still can guarantee near the oxidizing atmosphere that primary combustion zone side wall and front-back wall are, prevent primary combustion zone both walls and front-back wall water-cooling wall generation high temperature corrosion effectively.Therefore, employing prevents that the low NOx vortex burning device of high temperature corrosion from can thoroughly solve the problem of OFA (after-flame wind) spout with lower area both walls and front-back wall water-cooling wall generation high temperature corrosion.
Simple employing center powder-feeding cyclone burner for pulverized coal can guarantee the oxidizing atmosphere of burner hearth primary combustion zone both walls and front-back wall water-cooling wall, prevents the generation of high temperature corrosion.Simultaneously, the center powder-feeding cyclone burner for pulverized coal sprays into burner hearth with the thick coal culm air-flow over against recirculating zone, the center core of burner.The coal dust amount of therefore passing through the recirculating zone, center increases, and the crossing time of coal dust prolongs, and coal dust is burnt under reducing atmosphere, suppresses the formation of fuel type NOx to a certain extent.But, because the primary combustion zone excess air coefficient is higher, can not significantly reduce the discharging of NOx, commerical test shows that for the boiler that uses bituminous coal, behind the powder-feeding cyclone burner for pulverized coal of employing center, the discharge capacity of NOx can reduce about 20%.Simple OFA (after-flame wind) technology that adopts can realize the air classification that stove is interior, controls the formation of NOx effectively, and for the boiler that uses bituminous coal, after employing OFA (after-flame wind) technology, the discharge capacity of NOx can reduce about 40%.But, adopt OFA (after-flame wind) technology can make the primary combustion zone excess air coefficient less than 1, be in the combustion with meagre oxygen state, cause OFA following both walls of (after-flame wind) spout and front-back wall water-cooling wall generation high temperature corrosion, the safe operation that jeopardizes boiler.And adopt prevent the low NOx vortex burning device of high temperature corrosion after, adopt OFA (after-flame wind) technology make main combustion zone excess air coefficient less than 1 situation under, can form stronger reducing atmosphere in the recirculating zone, center, coal dust can suppress the generation of NOx further when passing through the burning of recirculating zone, center.Therefore adopt and prevent that the low NOx vortex burning device of high temperature corrosion from can significantly reduce the discharging of NOx, for the boiler that uses bituminous coal, the discharge capacity of NOx can reduce more than 80%.Simultaneously, employing prevents that the low NOx vortex burning device of high temperature corrosion from can thoroughly solve the problem of OFA (after-flame wind) spout with lower area both walls and front-back wall water-cooling wall generation high temperature corrosion.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention, and Fig. 2 is the structural representation of center powder-feeding cyclone burner for pulverized coal, and Fig. 3 is the structural representation of eddy flow OFA (after-flame wind) spout, and Fig. 4 is the A-A cutaway view of Fig. 1, and Fig. 5 is the structural representation of the specific embodiment four.
The specific embodiment
The specific embodiment one: (seeing Fig. 1, Fig. 4) present embodiment is made up of burner hearth 1, a plurality of centers powder-feeding cyclone burner for pulverized coal 2, front wall 3, side wall OFA (after-flame wind) spout 4, eddy flow OFA (after-flame wind) spout 5, burning-out zone 6, back wall 7, main combustion zone 8 and two side walls 9; Form burner hearth 1 between front wall 3, back wall 7 and two side walls 9, side wall OFA (after-flame wind) spout 4 is arranged on the top of two side walls 9 in the burner hearth 1, burner hearth 1 zone at powder-feeding cyclone burner for pulverized coal 2 places, side wall OFA (after-flame wind) spout 4 downside center is main combustion zone 8, burner hearth 1 zone at side wall OFA (after-flame wind) spout 4 and eddy flow OFA (after-flame wind) spout 5 places is a burning-out zone 6, a plurality of centers powder-feeding cyclone burner for pulverized coal 2 is separately positioned on the front-back wall of main combustion zone 8 one sides, and eddy flow OFA (after-flame wind) spout 5 is arranged on the front-back wall of burning-out zone 6 one sides.In main combustion zone 8 internal combustion, remaining fraction secondary wind enters burning-out zone 6 by side wall OFA (after-flame wind) spout 4 and eddy flow OFA (after-flame wind) spout 5 and participates in burning by center powder-feeding cyclone burner for pulverized coal 2 for the whole coal dust of present embodiment, wind and most of secondary wind.
The specific embodiment two: the center powder-feeding cyclone burner for pulverized coal 2 of (see figure 2) present embodiment is by nozzles 2-2, the eseparation ring 2-3 of three tapers, outer cyclone 2-4, interior cyclone 2-5, an airduct 2-8, pulverized coal feed pipe 2-9, interior air door baffle plate 2-10, outer damper plate 2-12, burner shell 2-13 and barrel-shaped dividing plate 2-14 form, burner shell 2-13 is fixedlyed connected with front wall 3 or back wall 7, an airduct 2-8 is arranged on the center of burner shell 2-13, the end that airduct 2-8 is positioned at burner shell 2-13 is nozzles 2-2, pulverized coal feed pipe 2-9 is arranged on the outside of burner shell 2-13, pulverized coal feed pipe 2-9 is fixedlyed connected with an airduct 2-8, be provided with the eseparation ring 2-3 of three tapers in airduct 2-8, the eseparation ring 2-3 of three tapers reduces successively towards nozzles 2-2 direction diameter, and the smaller diameter end of each eseparation ring 2-3 is towards nozzles 2-2, be provided with secondary air duct 2-11 in the outside of an airduct 2-8, be divided into interior secondary air duct 2-7 and outer secondary air duct 2-6 by barrel-shaped dividing plate 2-14 in the secondary air duct 2-11, in in interior secondary air duct 2-7 and outer secondary air duct 2-6, being respectively arranged with cyclone 2-5 and outside cyclone 2-4, interior secondary air duct 2-7 with outside the air inlet place of secondary air duct 2-6 also be provided with in air door baffle plate 2-10 with outside damper plate 2-12.Other composition is identical with the specific embodiment one with annexation.
The specific embodiment three: the eddy flow OFA of (referring to Fig. 3) present embodiment (after-flame wind) spout 5 is by center secondary air duct 5-1, cyclone 5-3, air door baffle plate 5-4, secondary air duct 5-5, center overfire air port 5-6 and overfire air port 5-7 form, center secondary air duct 5-1 is fixed on front wall 3, on back wall 7 or the side wall 9, overfire air port 5-7 is arranged on center overfire air port 5-6 one side of center secondary air duct 5-1, be fixed with cyclone 5-3 between overfire air port 5-7 and the center secondary air duct 5-1, air door baffle plate 5-4 is arranged on the outside of the overfire air port 5-7 of cyclone 5-3 one side, forms secondary air duct 5-5 between overfire air port 5-7 and the center secondary air duct 5-1.The air-flow that enters center secondary air duct 5-1 is a direct jet, and the air-flow that enters secondary air duct 5-5 produces rotation behind cyclone 5-3, and spin intensity can be regulated by air door baffle plate 5-4, and swirling eddy enters burner hearth through overfire air port 5-7.Center secondary wind is the rigidity that direct jet can guarantee jet, prolongs the jet stroke, realizes the interior degree of filling of stove preferably; The secondary wind of rotation produces bigger extended corner, strengthened the contact area of after-flame wind and high-temperature flue gas, the rotation of secondary wind has simultaneously strengthened the disturbance of burning-out zone air-flow, has realized that high-temperature flue gas and OFA (after-flame wind) mix preferably, therefore can be with the abundant after-flame of the unburnt fuel in main combustion zone.Other composition is identical with the specific embodiment one with annexation.
The specific embodiment four: the difference of (referring to Fig. 5) present embodiment and the specific embodiment three is to have increased outer overfire air port 5-8, outer secondary air channel 5-9, outer secondary wind cyclone 5-10 and outer secondary wind air door baffle plate 5-11, outer overfire air port 5-8 is fixed on the outside of overfire air port 5-7, outer secondary wind cyclone 5-10 is fixed on the overfire air port 5-7 of outer overfire air port 5-8 air intake one side, outer secondary wind air door baffle plate 5-11 is fixed on the outer secondary wind cyclone 5-10, forms outer secondary air channel 5-9 between overfire air port 5-7 and the outer overfire air port 5-8.The air-flow that enters center secondary air duct 5-1 is a direct jet, secondary wind through secondary air channel 5-5 and outside secondary air channel 5-9 enter burner hearth, the ratio that secondary wind air door baffle plate 5-4 and outer secondary wind air door baffle plate 5-11 can regulate inside and outside swirl secondary air makes secondary wind produce rotation by secondary wind cyclone 5-3 and outer secondary wind cyclone 5-10.Center secondary wind is the rigidity that direct jet can guarantee jet, prolongs the jet stroke, realizes the interior degree of filling of stove preferably; Become inside and outside two parts can regulate the ratio of inside and outside secondary wind the secondary air separating of rotation, increase the air quantity of OFA (after-flame wind), further reduce the discharging of NOx, simultaneously can also produce bigger extended corner, further strengthen the contact area of after-flame wind and high-temperature flue gas, further strengthen the disturbance of burning-out zone air-flow, realized high-temperature flue gas and OFA (after-flame wind) better mixing, therefore can be with the more abundant after-flame of the unburnt fuel in main combustion zone.Other composition is identical with the specific embodiment three with annexation.

Claims (2)

1. low NOx vortex burning device that prevents high temperature corrosion, it is made up of burner hearth (1), a plurality of centers powder-feeding cyclone burner for pulverized coal (2), front wall (3), side wall OFA spout (4), eddy flow OFA spout (5), burning-out zone (6), back wall (7), main combustion zone (8) and two side walls (9); Front wall (3), form burner hearth (1) between back wall (7) and two side walls (9), it is characterized in that side wall OFA spout (4) is arranged on the top of two side walls (9) in the burner hearth (1), burner hearth (1) zone at side wall OFA spout (4) downside center powder-feeding cyclone burner for pulverized coal (2) place is main combustion zone (8), burner hearth (1) zone at side wall OFA spout (4) and eddy flow OFA spout (5) place is burning-out zone (6), a plurality of centers powder-feeding cyclone burner for pulverized coal (2) are separately positioned on the front-back wall of main combustion zone (8) one sides, and eddy flow OFA spout (5) is arranged on the front-back wall of burning-out zone (6) one sides; Eddy flow OFA spout (5) is by center secondary air duct (5-1), cyclone (5-3), air door baffle plate (5-4), secondary air duct (5-5), center overfire air port (5-6), overfire air port (5-7), outer overfire air port (5-8), outer secondary air channel (5-9), outer secondary wind cyclone (5-10) and outer secondary wind air door baffle plate (5-11) are formed, center secondary air duct (5-1) is fixed on front wall (3), on back wall (7) or the side wall (9), overfire air port (5-7) is arranged on center overfire air port (5-6) side of center secondary air duct (5-1), be fixed with cyclone (5-3) between overfire air port (5-7) and the center secondary air duct (5-1), air door baffle plate (5-4) is arranged on the outside of the overfire air port (5-7) of cyclone (5-3) side, form secondary air duct (5-5) between overfire air port (5-7) and the center secondary air duct (5-1), outer overfire air port (5-8) is fixed on the outside of overfire air port (5-7), outer secondary wind cyclone (5-10) is fixed on the overfire air port (5-7) of outer overfire air port (5-8) air intake one side, outer secondary wind air door baffle plate (5-11) is fixed on the outer secondary wind cyclone (5-10), forms outer secondary air channel (5-9) between overfire air port (5-7) and the outer overfire air port (5-8).
2. a kind of low NOx vortex burning device that prevents high temperature corrosion according to claim 1, it is characterized in that center powder-feeding cyclone burner for pulverized coal (2) is by nozzles (2-2), the eseparation ring of three tapers (2-3), outer cyclone (2-4), interior cyclone (2-5), an airduct (2-8), pulverized coal feed pipe (2-9), interior air door baffle plate (2-10), outer damper plate (2-12), burner shell (2-13) and barrel-shaped dividing plate (2-14) are formed, burner shell (2-13) is fixedlyed connected with front wall (3) or back wall (7), an airduct (2-8) is arranged on the center of burner shell (2-13), the end that an airduct (2-8) is positioned at burner shell (2-13) is nozzles (2-2), pulverized coal feed pipe (2-9) is arranged on the outside of burner shell (2-13), pulverized coal feed pipe (2-9) is fixedlyed connected with an airduct (2-8), be provided with the eseparation ring (2-3) of three tapers in the airduct (2-8), the eseparation ring of three tapers (2-3) reduces successively towards nozzles (2-2) direction diameter, and the smaller diameter end of each eseparation ring (2-3) is towards nozzles (2-2), be provided with secondary air duct (2-11) in the outside of an airduct (2-8), be divided into interior secondary air duct (2-7) and outer secondary air duct (2-6) by barrel-shaped dividing plate (2-14) in the secondary air duct (2-11), interior secondary air duct (2-7) and outside be respectively arranged with in the secondary air duct (2-6) interior cyclone (2-5) and outside cyclone (2-4), interior secondary air duct (2-7) and outside the air inlet place of secondary air duct (2-6) also be provided with in air door baffle plate (2-10) and outside damper plate (2-12).
CNB2007100718159A 2007-02-28 2007-02-28 High temperature-and corrosion-protectal low NOx vortex burning device CN100464118C (en)

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CN102506419A (en) * 2011-09-30 2012-06-20 哈尔滨工业大学 Wall-type arranged two-stage burn-up air device
CN103388820B (en) * 2013-07-29 2016-03-16 上海交通大学 Clean coal dust burning industrial boiler plant
CN104676583A (en) * 2013-11-26 2015-06-03 烟台龙源电力技术股份有限公司 W flame boiler with sidewall having over fire air nozzles
CN104990069B (en) * 2015-07-10 2017-12-22 西安热工研究院有限公司 A kind of combustion system for improving Opposite Firing Boiler security and economy

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