CN109654485A - A kind of swirling pulverized coal combustion device using flue gas recirculation and precombustion chamber - Google Patents
A kind of swirling pulverized coal combustion device using flue gas recirculation and precombustion chamber Download PDFInfo
- Publication number
- CN109654485A CN109654485A CN201811552507.2A CN201811552507A CN109654485A CN 109654485 A CN109654485 A CN 109654485A CN 201811552507 A CN201811552507 A CN 201811552507A CN 109654485 A CN109654485 A CN 109654485A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- air
- precombustion chamber
- gas recirculation
- boiler
- Prior art date
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 131
- 239000003546 flue gases Substances 0.000 title claims abstract description 130
- 239000003245 coal Substances 0.000 title claims abstract description 70
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000002485 combustion reactions Methods 0.000 title claims abstract description 47
- 239000003570 air Substances 0.000 claims abstract description 196
- 238000000926 separation method Methods 0.000 claims abstract description 33
- 239000010410 layers Substances 0.000 claims description 16
- 238000004064 recycling Methods 0.000 claims description 8
- 239000007789 gases Substances 0.000 claims description 6
- 235000019504 cigarettes Nutrition 0.000 claims description 4
- 210000004894 snout Anatomy 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000011819 refractory materials Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000037010 Beta Effects 0.000 claims description 2
- 239000000843 powders Substances 0.000 abstract description 31
- 229910002089 NOx Inorganic materials 0.000 abstract description 14
- 239000010881 fly ash Substances 0.000 abstract description 3
- 239000004152 Nitrogen oxides Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitric oxide Chemical class 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O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract 1
- 229910052813 nitrogen oxides Inorganic materials 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 abstract 1
- 239000002817 coal dust Substances 0.000 description 19
- 244000171263 Ribes grossularia Species 0.000 description 12
- 239000000203 mixtures Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000002708 enhancing Effects 0.000 description 7
- 239000001308 nitrogen Substances 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
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Classifications
-
- 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
-
- 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
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
-
- 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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- 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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
-
- 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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
Abstract
Description
Technical field
The present invention relates to industrial coal powder boiler burner fields, use flue gas recirculation and precombustion chamber more particularly to a kind of Swirling pulverized coal combustion device.
Background technique
Currently, the main of China concentrates on station boiler and industrial coal powder boiler with coal equipment, wherein industrial coal powder boiler Close to 600,000, year consumes about 6.4 hundred million tons of coal.With constantly improve for small and medium-sized industrial coal powder boilers matching system, industry The technology of pulverized-coal fired boiler is more and more mature, but the problem of be limited to size of burner hearth and combustion system, small and medium-sized industrial coal powder boilers NOx discharge is big, easy slagging, the problems such as unburned combustible in fly ash is high is on increasingly strict pollutant control and discharge standard More highlight.
For the application and research of middle-size and small-size industrial coal powder boiler, a large amount of work has been done by Germany and France.It is German typical Technology have direct-firing HM boiler series, middle storage formula Dr.Schoppe boiler and Saacke boiler combustion equipment etc.；France Pillard has the research to show unique characteristics in low nitrogen coal burner the relevant technologies.Wherein Saacke company is exclusively for CHINESE COAL Electricity and heating field have developed minimum discharge coal powder burner (hereinafter referred to as CONOX UCC), and CONOX UCC is using segmentation It blows multistage combustion technology, by being respectively arranged one layer of swirl secondary air direct current annular First air is inside and outside, in precombustion chamber surrounding Be circular layout multiple direct currents wind snout three times, realizes the burning of air radial grading, can form uniqueness in furnace by the burner Stabilization short-flame, while NOx generation amount can be reduced.
China uses the coal powder burner of flue gas recirculation, such as patent of invention " one on industrial coal powder boiler at present Kind industrial coal powder boiler flue gas recirculation low nitrogen burning method and system " (application No. is 201610614713.6, data of publication of application For December 21, application publication number CN106247368A in 2016, " file one " is called in the following text) recycled blower extracts a part Flue gas is first mixed with a part of high temperature Secondary Air as circulating flue gas, then is mixed into burner hearth with the First air for carrying coal dust and is carried out Burning；Utility model patent " a kind of low nitrogen burning system of flue gas recirculation and reburning technology synergistic effect " (application No. is 201320606708.2, authorized announcement date is 16 days 04 month, Authorization Notice No. CN203549796U in 2014, calls " file in the following text Two ") a kind of low nitrogen burning system that the flue gas recirculation for coal-powder boiler is combined with reburning technology is disclosed, which utilizes Microfine coal in fine Coal powder cabin is blown into burner hearth by flue gas recycled, achievees the purpose that restore NOx；Patent of invention " adopt by one kind Powder " Ω " shape industrial coal powder boiler is given with the center of flue gas recirculation " (application No. is 201710860350.9, data of publication of application to be 19 days 01 month, application publication number CN107606606A in 2018, call " file three " in the following text) devise a primary air piping, direct current Secondary air channel, eddy flow inner second air pipe and eddy flow outer second air the pipe spiral-flow powdered coal burning that successively concentric circles is arranged from the inside to the outside Device.
Industrial coal powder boiler is extensive in the area distribution that China is applicable in, therefore also inevitably brings the adaptation of its coal Property problem, while with the increasingly strict energy-saving and emission-reduction policy of country, increasingly to the NOx emission limitation of industrial coal powder boiler Height, thus for industrial coal powder boiler design a coal it is applied widely and with high efficency low NOx combustibility burner It is most economical, reasonable method.
In conclusion existing industrial coal powder boiler is there are NOx discharge height, slagging is serious, unburned combustible in fly ash is high And the problem of poor combustion stability.
Summary of the invention
The purpose of the present invention is to solve existing industrial coal powder boiler, that there are NOx discharges is high, slagging is serious, flying dust The problem of combustible content height and poor combustion stability, and then a kind of eddy flow coal using flue gas recirculation and precombustion chamber is provided Powder burner.
The technical scheme is that
A kind of swirling pulverized coal combustion device using flue gas recirculation and precombustion chamber, it includes pulverized coal combustion system and flue gas Recirculating system, pulverized coal combustion system include vortex burner, precombustion chamber and multiple separation overfire air ports, rotational flow coal dust Burner is connect by precombustion chamber 8 with boiler, and vortex burner includes primary air piping, inside flue gas recirculation air hose, interior Secondary air channel, outside flue gas recirculation air hose, outer second air pipe and multiple cyclones, it is inside flue gas recirculation air hose, interior secondary Air hose, outside flue gas recirculation air hose and outer second air pipe are sequentially coaxially set on primary air piping from inside to outside, inside flue gas The inside for recycling air hose, inner second air pipe, outside flue gas recirculation air hose and outer second air pipe is mounted on cyclone, flue gas Recirculating system includes multiple flue gas recycled pipeline valves, multiple flue gas recycled branch pipe(tube)s, multiple secondary air pipelines Valve, flue gas recycled pipeline and recirculation blower, the entrance of inside flue gas recirculation air hose and outside flue gas recirculation air hose It is connect respectively by flue gas recycled branch pipe(tube) with flue gas recycled pipeline, recycling is arranged in the arrival end of flue gas recycled pipeline Blower, multiple separation overfire air ports are evenly distributed in the circumferential direction in precombustion chamber periphery, and multiple separation overfire air ports enter Mouth end is connect by flue gas recycled branch pipe(tube) with flue gas recycled pipeline and outer second air pipe, multiple separation overfire air ports Outlet end is connect with boiler, and flue gas recycled pipeline valve, inner second air pipe, outer two are arranged on each flue gas recycled branch pipe(tube) The arrival end of secondary air hose and multiple separation overfire air ports is respectively provided with secondary air pipeline valve.
Further, the boiler is horizontal boiler, and vortex burner is arranged in horizontal pot by precombustion chamber connection On the front wall of furnace.
Further, the boiler is vertical boiler, and vortex burner is arranged in vertical boiler by precombustion chamber connection On the furnace roof of furnace.
Further, the angle that the center line of multiple separation overfire air ports and the axis of primary air piping are fixed in one, β= 0~60 °.
Further, multiple separation overfire air ports include multiple internal layer separation overfire air ports and multiple outer layers separation two Secondary wind snout, multiple internal layer separation overfire air ports separate the uniform interlaced arrangement of overfire air port with multiple outer layers.
Further, precombustion chamber is rolled by heat resisting steel, inner lining refractory.
Further, precombustion chamber arrival end diameter is 1.5~3 times of outer second air pipe outside diameter, and precombustion chamber length is outer two 0.8~2 times of secondary air hose outer diameter.
Further, the arrival end of precombustion chamber is to having certain extended corner, α=0~10 ° between outlet end.
Further, each cyclone is equipped with cyclone regulation handle.
The present invention has the effect that compared with prior art
1, the present invention advantageously reduces NOx generation amount: of the present invention to use flue gas again for industrial coal powder boiler In the swirling pulverized coal combustion device of circulation and precombustion chamber, it is equipped in annular between turbulent burner primary air piping and inner second air pipe Side flue gas recirculation air hose is equipped with annular outboard flue gas recirculation air hose between inner second air pipe and outer second air pipe, postpone The mixing of First air and inner second air and the mixing of inner second air and outer second air, therefore it is radial to enhance pre-burning room air The effect of fractional combustion；Separating secondary air separating is inside and outside two layers, and the elder generation and flue gas recycled before entering burner hearth are mixed in air hose It closes, two separate overfire air port interlaced arrangement, is successively injected to burner hearth center, further enhance the fractional combustion in burner hearth Degree, the device realize Researched of Air Staging Combustion Burning Pulverized Coal, effectively inhibit the generation of NOx.
Compare CONOX UCC, it is of the present invention for industrial coal powder boiler using flue gas recirculation and precombustion chamber Swirling pulverized coal combustion device be sequentially arranged on the outside of the direct current First air of center annular inboard flue gas recycled, annular inner second air, Annular outboard flue gas recycled and annular outer second air enhance the radial grading burning of coal dust, advantageously reduce the life of NOx At.
" file one " described low nitrogen burning method and system is that part of smoke is extracted in recirculation blower as circulation Flue gas is first mixed with a part of high temperature Secondary Air, then is mixed into burner hearth with the First air for carrying coal dust and is burnt, the device The wind-warm syndrome and oxygen content into the First air of burner are controlled well by control loop exhaust gas volumn, are conducive to coal powder ignition The raising of stability, but its turbulent burner periphery is not layered setting annular secondary wind, generates the effect of radial grading burning Poor, the low nitrogen burning effect of formation is limited.It compares " file one ", it is of the present invention to use cigarette for industrial coal powder boiler Gas recycling and precombustion chamber swirling pulverized coal combustion device center First air periphery be sequentially arranged annular inboard flue gas recycled, Annular inner second air, annular outboard flue gas recycled and annular outer second air, the structure are conducive to the radial direction of coal dust in First air Fractional combustion.
It compares " file three ", burner of the present invention is equipped with precombustion chamber, is conducive to the formation of Central backflow area, recirculating zone is big Residence time of the breeze airflow in the reducing atmosphere of center is extended, the generation of NOx is advantageously reduced.
2, the present invention is conducive to increase the stability and combustion intensity of flame: of the present invention for industrial coal powder boiler Using in the swirling pulverized coal combustion device of flue gas recirculation and precombustion chamber, the arrival end of precombustion chamber is to having one between outlet end Fixed spread angle alpha, α=0~10 °, under the action of precombustion chamber spread angle alpha, breeze airflow high temperature gases recirculating area easy to form, After breeze airflow kindling, near reverse reflux to burner outlet, combustion reaction is further participated in, enhances the stability of flame And combustion intensity.Flue gas recycled is divided into inside flue gas recycled and outside flue gas recycled, and is layered injection precombustion chamber, scene The injection amount and eddy flow that inside flue gas recycled and outside flue gas recycled can be adjusted according to coal dust firing situation in precombustion chamber are strong Degree, so that center of burning in regulating stove, improves furnace flame full condition, and then the stability of enhancing flame and burning are strong Degree.
It compares " file three ", the rotation using flue gas recirculation and precombustion chamber of the present invention for industrial coal powder boiler It flows coal powder burner and is equipped with precombustion chamber and cyclone regulation handle, form high temperature recirculation zone in precombustion chamber, be conducive to coal dust gas Stream kindling adjusts cyclone regulation handle according to the operating condition of boiler and carries out air distribution adjusting, in real time so that strengthen burning is steady Qualitative and intensity.
3, the present invention is conducive to avoid precombustion chamber wall surface slagging: of the present invention to use cigarette for industrial coal powder boiler The swirling pulverized coal combustion device most inner side air hose of gas recycling and precombustion chamber is direct current First air, and outside is followed successively by annular inboard Eddy flow flue gas recycled, annular inward eddy Secondary Air, annular outboard eddy flow flue gas recycled and annular contour stealth Secondary Air, coal dust Pre-burning room temperature is controlled in precombustion chamber central burner, while using flue gas recycled, avoids slagging.The structure can be to avoid straight Coal dust is flowed to the deposition of the abrasion of precombustion chamber wall surface and coal dust and lime-ash, to create condition for precombustion chamber longtime running.
CONOX UCC is classified wind from inside to outside and is sequentially disposed in Swirl Secondary Air, annular direct current First air, annular rotation The direct current tertiary air of Secondary Air and uniform intervals arrangement is flowed, the arrangement of the structure is easy to revolve annular direct current First air at center Centrifugal effect occurs under the action of stream Secondary Air, spreads to the periphery, and then the coal dust in First air is caused to wash away, wear precombustion chamber Wall surface causes the deposition of coal dust and lime-ash on precombustion chamber wall surface.CONOX UCC is compared, direct current First air of the invention is arranged in Vortex burner center, outside are sequentially disposed in annular inboard eddy flow flue gas recycled, annular inward eddy Secondary Air, annular Center direct current First air is concentrated on precombustion chamber well by outside eddy flow flue gas recycled and annular contour stealth Secondary Air, the structure Central area is avoided coal dust in First air being thrown to precombustion chamber 8 due to the barrier of outside each layer flue gas recycled and Secondary Air The possibility of wall surface is conducive to avoid the deposition and slagging of coal dust on precombustion chamber wall surface.
Detailed description of the invention
Fig. 1 is that the present invention applies the structural schematic diagram on horizontal boiler；
Fig. 2 is that the present invention applies the structural schematic diagram on vertical boiler.
Specific embodiment
Specific embodiment 1: illustrating present embodiment in conjunction with Fig. 1 and Fig. 2, a kind of of present embodiment uses flue gas again The swirling pulverized coal combustion device of circulation and precombustion chamber, it includes pulverized coal combustion system and flue gas recirculation system, coal dust firing system System includes vortex burner 1, precombustion chamber 8 and multiple separation overfire air ports 7, and vortex burner 1 passes through precombustion chamber 8 It is connect with boiler 10, vortex burner 1 is co-axially located at the front end of precombustion chamber 8, the outlet of vortex burner 1 and pre-burning 8 inner wall of room concordant (i.e. primary air piping 1-1, inside flue gas recirculation air hose 1-2, inner second air pipe 1-3, outside flue gas recirculation Air hose 1-4, the outlet of outer second air pipe 1-5 are concordant with 8 inner wall of precombustion chamber), vortex burner 1 includes primary air piping 1- 1, inside flue gas recirculation air hose 1-2, inner second air pipe 1-3, outside flue gas recirculation air hose 1-4, outer second air pipe 1-5 and more A cyclone 1-6, inside flue gas recirculation air hose 1-2, inner second air pipe 1-3, outside flue gas recirculation air hose 1-4 and outer secondary Air hose 1-5 is sequentially coaxially set on primary air piping 1-1 from inside to outside, inside flue gas recirculation air hose 1-2, inner second air pipe 1- 3, the inside of outside flue gas recirculation air hose 1-4 and outer second air pipe 1-5 are mounted on cyclone 1-6, the primary air piping 1-1 Interior conveying high concentration pulverized coal air-flow；Flue gas recirculation system includes multiple flue gas recycled pipeline valves 2, multiple flue gas recycleds Branch pipe(tube) 3, multiple secondary air pipeline valves 4, flue gas recycled pipeline 5 and recirculation blower 6, inside flue gas recirculation wind The entrance of pipe 1-2 and outside flue gas recirculation air hose 1-4 pass through flue gas recycled branch pipe(tube) 3 and flue gas recycled pipeline 5 respectively Recirculation blower 6 is arranged in connection, the arrival end of flue gas recycled pipeline 5, and multiple separation overfire air ports 7 are along the circumferential direction uniform It is arranged in 8 periphery of precombustion chamber, the arrival end of multiple separation overfire air ports 7 passes through flue gas recycled branch pipe(tube) 3 and recycling cigarette Feed channel 5 is connected with outer second air pipe 1-5, and the outlet end of multiple separation overfire air ports 7 is connect with boiler 10, each recycling Flue gas recycled pipeline valve 2, inner second air pipe 1-3, outer second air pipe 1-5 and multiple separation two are set on flue gas branch pipe(tube) 3 The arrival end of secondary wind snout 7 is respectively provided with secondary air pipeline valve 4.
Between primary air piping 1-1 and inner second air pipe 1-3 of the invention be equipped with inside flue gas recirculation air hose 1-2, interior two It is equipped with flue gas recirculation air hose 1-4 in outside between secondary air hose 1-3 and outer second air pipe 1-5, has postponed First air and inner second air Mixing and inner second air and outer second air mixing, therefore enhance the effect that air radial grading in precombustion chamber 8 burns.
The present invention is equipped with precombustion chamber 8, is conducive to the formation of Central backflow area, recirculating zone extends greatly breeze airflow at center Residence time in reducing atmosphere advantageously reduces the generation of NOx.
Flue gas recycled of the invention is divided into inside flue gas recycled and outside flue gas recycled, inside flue gas recycled and Outside flue gas recycled passes through inside flue gas recirculation air hose 1-2 and outside flue gas recirculation air hose 1-4 layering respectively and injects in advance Room 8 is fired, scene can adjust the injection of inside flue gas recycled and outside flue gas recycled according to coal dust firing situation in precombustion chamber 8 Amount and swirl strength, so that center of burning in regulating stove, improves furnace flame full condition, and then enhance the stabilization of flame Property and combustion intensity.
Most inner side air hose of the invention is direct current First air, and outside is followed successively by annular inboard eddy flow flue gas recycled, ring Shape inward eddy Secondary Air, annular outboard eddy flow flue gas recycled and annular contour stealth Secondary Air, coal dust fire at 8 center of precombustion chamber It burns, while using temperature in flue gas recycled control precombustion chamber 8, avoiding slagging.The structure can be to avoid direct current coal dust to pre-burning The abrasion of 8 wall surface of room and the deposition of coal dust and lime-ash, to be created condition for 8 longtime running of precombustion chamber.
Specific embodiment 2: embodiment is described with reference to Fig. 1, the boiler 10 of present embodiment is horizontal pot Furnace, vortex burner 1 are arranged on the front wall 9 of horizontal boiler by the connection of precombustion chamber 8.So set, the multiple point Secondary Air and flue gas recycled are accessed from 7 arrival end of overfire air port, the multiple 7 outlet end of separation overfire air port setting exists On the front wall 9 of horizontal boiler.Other compositions and connection relationship are same as the specific embodiment one.
Specific embodiment 3: embodiment is described with reference to Fig. 2, the boiler 10 of present embodiment is vertical boiler Furnace, vortex burner 1 are arranged on the furnace roof 11 of vertical boiler by the connection of precombustion chamber 8.So set, the multiple point Secondary Air and flue gas recycled are accessed from 7 arrival end of overfire air port, the multiple 7 outlet end of separation overfire air port setting exists On the furnace roof 11 of vertical boiler.Other compositions and connection relationship are the same as one or two specific embodiments.
Specific embodiment 4: illustrating present embodiment, multiple separation Secondary Airs of present embodiment in conjunction with Fig. 1 and Fig. 2 The center line of spout 7 and the axis of primary air piping 1-1 are in a fixed angle beta, β=0~60 °.Other compositions and connection relationship It is identical as specific embodiment one, two or three.
Specific embodiment 5: illustrating present embodiment, multiple separation Secondary Airs of present embodiment in conjunction with Fig. 1 and Fig. 2 Spout 7 includes multiple internal layers separation overfire air port and multiple outer layers separate overfire air port, multiple internal layer separation Secondary Air sprays Mouth separates the uniform interlaced arrangement of overfire air port with multiple outer layers.So set, separation secondary air separating is inside and outside two layers, entering Elder generation mixes in air hose with flue gas recycled before burner hearth, inside and outside two separate overfire air port interlaced arrangement, successively into burner hearth The heart is injected, and the fractional combustion degree in burner hearth is further enhanced, which realizes Researched of Air Staging Combustion Burning Pulverized Coal, effectively inhibit The generation of NOx.Other compositions and connection relationship and specific embodiment one, two, three or four are identical.
Specific embodiment 6: illustrating present embodiment in conjunction with Fig. 1 and Fig. 2, the precombustion chamber 8 of present embodiment is by heat resisting steel It rolls, inner lining refractory.Other compositions and connection relationship and specific embodiment one, two, three, four or five are identical.
Specific embodiment 7: illustrating present embodiment in conjunction with Fig. 1 and Fig. 2,8 arrival end of precombustion chamber of present embodiment is straight Diameter is 1.5~3 times of outer second air pipe 1-5 outer diameter, and 8 length of precombustion chamber is 0.8~2 times of outer second air pipe 1-5 outer diameter.So Setting, 8 draw ratio of precombustion chamber (8 length of precombustion chamber and arrival end diameter ratio) and diameter ratio (8 diameter of precombustion chamber and eddy flow Device 1-6 diameter ratio) corresponding adjusting can be made according to design coal, it is found according to experiment, meager coal type pre-combustion chamber burner Draw ratio and diameter are than being respectively 1.7~2.2,2.0~2.8, and the draw ratio and diameter of bituminous coal type pre-combustion chamber burner are than difference It is 1.0~1.2,1.7~2.0, adjusts precombustion chamber draw ratio and diameter ratio for different types of coal, reaches optimal burning effect Fruit.Other compositions and connection relationship and specific embodiment one, two, three, four, five or six are identical.
Specific embodiment 8: illustrating present embodiment, the arrival end of the precombustion chamber 8 of present embodiment in conjunction with Fig. 1 and Fig. 2 To having certain spread angle alpha, α=0~10 ° between outlet end.So set, under the action of 8 spread angle alpha of precombustion chamber, coal Powder air-flow high temperature gases recirculating area easy to form, after breeze airflow kindling, reverse reflux to swirling pulverized coal combustion device exports attached Closely, combustion reaction is further participated in, the stability and combustion intensity of flame are enhanced.Other compositions and connection relationship and specific reality It is identical to apply mode one, two, three, four, five, six or seven.
Specific embodiment 9: illustrating present embodiment in conjunction with Fig. 1 and Fig. 2, on each cyclone 1-6 of present embodiment Equipped with cyclone regulation handle 1-7.So set, forming high temperature recirculation zone in precombustion chamber 8, be conducive to breeze airflow kindling, root Cyclone regulation handle 1-7 is adjusted in real time according to the operating condition of boiler 10 and carries out air distribution adjusting, thus the stability of strengthen burning And intensity.Other compositions and connection relationship and specific embodiment one, two, three, four, five, six, seven or eight are identical.
Claims (9)
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