CN109654484A - Spray reducing agent denitration in the stove burner in industrial coal powder boiler burner primary zone - Google Patents
Spray reducing agent denitration in the stove burner in industrial coal powder boiler burner primary zone Download PDFInfo
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- CN109654484A CN109654484A CN201811552506.8A CN201811552506A CN109654484A CN 109654484 A CN109654484 A CN 109654484A CN 201811552506 A CN201811552506 A CN 201811552506A CN 109654484 A CN109654484 A CN 109654484A
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- air
- burner
- pipe
- flue gas
- eddy flow
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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
- 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
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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
- 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
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
Abstract
Spray reducing agent denitration in the stove burner in industrial coal powder boiler burner primary zone, the present invention relates to boiler denitration in the stove burners, the problem of present invention aim to address current industrial coal powder boiler NOx discharges high, denitration in the stove to load performance difference, it includes burner, flue gas recycled pipeline and air-introduced machine, and burner includes primary air piping, direct-current secondary air hose, eddy flow inner second air pipe, eddy flow outer second air pipe, first axis swirl vane and the second axial swirl blades；It further includes mixer, amino reductive delivery pipe, thick coal culm delivery pipe, three secondary air pipelines, three secondary air pipeline valves, three flue gas recycled pipeline valves, three flue gas recycled branch pipe(tube)s, four level-one fire air nozzles and multiple second level fire air nozzles, and the present invention is used for boiler combustion field.
Description
Technical field
The present invention relates to boiler denitration in the stove burners, and in particular to the spray reduction of industrial coal powder boiler burner primary zone
Agent denitration in the stove burner, belongs to field of boilers.
Background technique
Coal-burned industrial boiler is that main in addition to station boiler of China is equipped with coal, at present the coal-burned industrial boiler in China
Ownership sum close to 600,000, year coal consumption is more than 600,000,000 tons.The annual NO of coal-burned industrial boilerxDischarge amount about 2,000,000
Ton, it has also become one of China most important NOx pollutant emission source." the pot that the May in 2014 of national environmental protection portion on the 16th promulgates
Furnace atmosphere pollutants emission standards " in GB13271-2014 clear stipulaties 7MW or more with coal-fired hot-water boiler from 2015
From on October 1, in, NOx discharge must not exceed 400mg/m3；The newly-built coal-fired hot-water boiler of 7MW or more was from October 1 in 2015
Day rises, and NOx discharge must not exceed 300mg/m3；For key area, NOx discharge is even more that must not exceed 200mg/m3.Cause
This, the NOx discharge for controlling industrial coal powder boiler is very urgent.
Selective non-catalytic reduction SNCR technology is a kind of more mature NOx abatement commercial technologies, SNCR technology one
As only in 850 DEG C~1100 DEG C of temperature range effectively, primary combustion zone higher for temperature be difficult to realize denitration work
With, but when primary zone is in hypoxemia strong reducing property atmosphere, the temperature range that denitration reaction can occur promotes to 900~
In 1300 DEG C.
For SNCR technology, there have been correlative study, patent of invention " large-sized boiler high-temperature flue gas region spray in the country at present
Ammonia denitrating system and denitrating technique " China Patent No. is ZL201610056650.7, data of publication of application is January 28 in 2016
Day, application publication number CN105509081A, " file one " was called in the following text in the arrangement amino reductive spray of horizontal flue entrance cross-section
Pipe, jet pipe, which liquidates, to be opened up spray orifice on flue gas direction and sprays ammonia to flue gas.A kind of patent of invention " burning for industrial coal powder boiler
The burner of device center spray ammonia " data of publication of application is December 15, application publication number CN107477573A in 2017, it calls in the following text
" file two " proposes that amino reductive and thick coal culm, which are mixed merga pass primary air piping, to be sprayed into furnace.
Although above-mentioned technology can reduce the NO of industrial coal powder boiler to a certain extentxConcentration of emission, but to temperature
Sensitivity, to the problem of boiler load adaptability difference.
Summary of the invention
Present invention aim to address current industrial coal powder boiler NOx discharge height, denitration in the stove to load performance
The problem of difference, and then industrial coal powder boiler burner primary zone is provided and sprays reducing agent denitration in the stove burner.
The present invention in order to solve the above problem and the technical solution adopted is that:
It includes burner, flue gas recycled pipeline and air-introduced machine, burner include primary air piping, direct-current secondary air hose,
Eddy flow inner second air pipe, eddy flow outer second air pipe, first axis swirl vane and the second axial swirl blades；It further includes mixing
Device, amino reductive delivery pipe, thick coal culm delivery pipe, three secondary air pipelines, three secondary air pipeline valves, three
A flue gas recycled pipeline valve, three flue gas recycled branch pipe(tube)s, four level-one fire air nozzles and multiple second level burnout degrees
Spout；Primary air piping, direct-current secondary air hose, eddy flow inner second air pipe and eddy flow outer second air pipe ecto-entad are sequentially coaxially arranged
It is mounted on boiler furnace, primary air piping, direct-current secondary air hose, eddy flow inner second air pipe and eddy flow outer second air pipe and Boiler Furnace
Thorax inner wall is concordantly arranged, and the second axial swirl blades are mounted between direct-current secondary air hose and eddy flow inner second air pipe, first axle
It being mounted between eddy flow inner second air pipe and eddy flow outer second air pipe to swirl vane, primary air piping is connect with mixer outlet,
Amino reductive delivery pipe and thick coal culm delivery pipe are connect with mixer entrance, direct-current secondary air hose and a secondary air
Pipeline connection, the Guan Yuyi secondary air pipeline connection of eddy flow inner second air, Guan Yuyi Secondary Air of eddy flow outer second air are empty
Feed channel connection, and each secondary air Pipe installing has a secondary air pipeline valve, flue gas recycled pipeline with
Air-introduced machine connection, and flue gas recycled pipeline is connect with one end of three flue gas recycled branch pipe(tube)s respectively, and each recycling
One flue gas recycled pipeline valve is installed, the other end of each flue gas recycled branch pipe(tube) is respectively with one on flue gas branch pipe(tube)
The side wall of a secondary air pipeline connects, and four level-one fire air nozzles are mounted at four angles in the middle part of burner hearth, and multiple two
Grade fire air nozzle is arranged on updraught flue front wall.
Beneficial effects of the present invention:
The present invention, which is more advantageous to, reduces NOxDischarge amount
1. " file one " described technical solution arranges amino reductive jet pipe in horizontal flue entrance cross-section, jet pipe is right
It rushes and opens up spray orifice on the direction of flue gas, ammonia is sprayed into flue gas, as inner flue gas of the stove quickly enters convection current after amino reductive penetrating
Heat exchange area, the region heat transfer intensity is big, and rapidly, when dropping to temperature window or less, reduction reaction stops for flue-gas temperature decline, because
This amino reductive residence time in temperature window is short, and the action time of reduction reaction is short, works as load reduction, and furnace temperature decline is gone back
Former effect is bad.Unreacted amino reductive also will cause the escaping of ammonia simultaneously, and it is separately extra in tail portion setting equipment removing to need
Reducing agent ammonia.
It compares " file one ", amino reductive is injected directly into low nitrogen turbulent burner outlet by technology of the present invention
Heart recirculating zone, since this technology uses low nitrogen turbulent burner, Central backflow area has strong reducing property, and amino reductive exists
Denitration reaction persistently occurs in 900~1200 DEG C of temperature window, expands the temperature window that denitration reaction occurs for amino reductive,
The NO in primary zone is greatly loweredxProduction quantity；And the flue gas of rotation makes the disturbance between amino reductive and flue gas stream more
Reinforce strong, accelerate amino reductive and mix with flue gas, extends the residence time that denitration reaction occurs for amino reductive, cigarette
NO in gasxIt is also more thorough with reacting for amino reductive, therefore NO can be more effectively reduced in the late combustionxConcentration, make NOx
Discharge amount is further decreased.
3. amino reductive and thick coal culm are mixed merga pass primary air piping and sprayed into furnace by " file two " described technical solution.
Since the temperature in burner centre region is affected by boiler load, when boiler load changes, it is difficult to guarantee in burner
For heart regional temperature always in the temperature window of amino reductive reaction, denitration in the stove is poor to load performance, it is difficult to protect
Demonstrate,prove the denitration effect of amino reductive.
It compares " file two ", apparatus of the present invention adjust burner centre regional temperature using flue gas recycled, when boiler is low
When load operation, increase amount of circulating gas, improves primary zone temperature；When boiler heavy-duty service, amount of circulating gas is reduced, is reduced
Burner centre regional temperature so that is efficiently controlled in the temperature window of amino reductive to react by primary zone temperature
Interior, moreover, flue gas is mixed into the reducing atmosphere for strengthening burner centre region, extends coal dust in reducing atmosphere
Under residence time, it is suppressed that the NO in burner centre regionxDischarge amount.
In addition to this, the present invention arranges that wherein level-one fire air nozzle is arranged in the middle part of burner hearth using two-stage over-fire wind
Four corners, four strands of jet streams for being sent into burner hearth are cut in the imaginary circle with certain diameter at burner hearth center, to strengthen gas
Stream rotation, is sufficiently mixed high-temperature flue gas with burnout degree.Second level fire air nozzle is arranged on updraught flue front wall, short transverse
On away from burner hearth corner have a certain distance, arrangement is that the arrangement of level one is set, and covering is wide, can be avoided smoke corridor.Pass through two
The arrangement of grade burnout degree, can strengthen Researched of Air Staging Combustion Burning Pulverized Coal degree, be conducive to further decrease NOx discharge.
Detailed description of the invention
Fig. 1 is the boiler of horizontal arrangement using industrial coal powder boiler burner primary zone spray reducing agent denitration in the stove burning dress
The structural schematic diagram set.
Fig. 2 is the boiler of vertical using industrial coal powder boiler burner primary zone spray reducing agent denitration in the stove burning dress
The structural schematic diagram set.
Fig. 3 is the scheme of installation at four angles that four level-one fire air nozzles 11 are mounted in the middle part of burner hearth.
Specific embodiment
Specific embodiment 1: illustrating present embodiment, the combustion of industrial coal powder boiler described in present embodiment in conjunction with Fig. 1-Fig. 3
Reducing agent denitration in the stove burner is sprayed in burner primary zone, it includes burner, flue gas recycled pipeline 16 and air-introduced machine 18, combustion
Burner includes primary air piping 1, direct-current secondary air hose 2, eddy flow inner second air pipe 3, eddy flow outer second air pipe 4, first axis eddy flow
Blade 5 and the second axial swirl blades 6；It further includes mixer 7, amino reductive delivery pipe 8, thick coal culm delivery pipe 9, three
Secondary air pipeline, three recycling cigarettes of flue gas recycled pipeline valve 15, three of secondary air pipeline valve 14, three
17, four, gas branch pipe road level-one fire air nozzle 11 and multiple second level fire air nozzles 12；Primary air piping 1, direct-current secondary air hose
2, eddy flow inner second air pipe 3 and 4 ecto-entad of eddy flow outer second air pipe, which are sequentially coaxially arranged, is mounted on boiler furnace 10, once
Air hose 1, direct-current secondary air hose 2, eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4 is concordant with 10 inner wall of boiler furnace is arranged,
Second axial swirl blades 6 are mounted between direct-current secondary air hose 2 and eddy flow inner second air pipe 3, and first axis swirl vane 5 is pacified
Between eddy flow inner second air pipe 3 and eddy flow outer second air pipe 4, primary air piping 1 and the outlet of mixer 7 are connected, amino reduction
Agent delivery pipe 8 and thick coal culm delivery pipe 9 are connect with 7 entrance of mixer, direct-current secondary air hose 2 and a secondary air pipeline
Connection, eddy flow inner second air pipe 3 are connect with a secondary air pipeline, eddy flow outer second air pipe 4 and a secondary air
Pipeline connection, and each secondary air Pipe installing has a secondary air pipeline valve 14, flue gas recycled pipeline 16
It is connect with air-introduced machine 18, and flue gas recycled pipeline 16 is connect with one end of three flue gas recycled branch pipe(tube)s 17 respectively, and every
One flue gas recycled pipeline valve 15 is installed on a flue gas recycled branch pipe(tube) 17, each flue gas recycled branch pipe(tube) 17
The other end is connect with the side wall of a secondary air pipeline respectively, and four level-one fire air nozzles 11 are mounted in the middle part of burner hearth
At four angles, multiple second level fire air nozzles 12 are arranged on 13 front wall of updraught flue.
Specific embodiment 2: illustrating present embodiment, the combustion of industrial coal powder boiler described in present embodiment in conjunction with Fig. 1-Fig. 3
Reducing agent denitration in the stove burner is sprayed in burner primary zone, and primary air piping 1 passes through direct-current secondary air hose 2 and exports with mixer 7
Connection.Other methods are same as the specific embodiment one.
Specific embodiment 3: embodiment is described with reference to Fig. 3, industrial coal powder boiler burner described in present embodiment
Reducing agent denitration in the stove burner is sprayed in primary zone, and each level-one fire air nozzle 11 is arranged towards 10 center of boiler furnace, and four
The center line of a level-one fire air nozzle 11 and the circle where 10 center line of boiler furnace are tangent.Other methods and specific embodiment party
Formula one is identical.
Specific embodiment 4: illustrating present embodiment, industrial coal powder boiler described in present embodiment in conjunction with Fig. 1 and Fig. 3
Reducing agent denitration in the stove burner is sprayed in burner primary zone, and burner is mounted in 10 front wall of boiler furnace of horizontal boiler
Heart position.Other methods are same as the specific embodiment one.
Specific embodiment 5: embodiment is described with reference to Fig. 2, industrial coal powder boiler burner described in present embodiment
Reducing agent denitration in the stove burner is sprayed in primary zone, and burner is mounted on the centre bit on 10 top of boiler furnace of vertical boiler
It sets.Other methods are same as the specific embodiment one.
Working principle
When the invention works thick coal culm air-flow and amino reductive in mixer 7 after mixing, via primary air piping 1
It is sent into furnace, is burnt by high temperature reflux flue gas postignition, part combustion air passes through in direct-current secondary air hose 2, eddy flow two
Secondary air hose 3 and eddy flow outer second air pipe 4 are sent into burner hearth, with thick coal culm air flow contacts and oxygen needed for providing coal dust initiation combustion,
For primary zone excess air coefficient between 0.48~0.72, the Researched of Air Staging Combustion Burning Pulverized Coal of height makes temperature control in primary zone exist in furnace
1300 DEG C occur denitration reaction hereinafter, being conducive to amino reductive, substantially reduce the NOx content generated in flue gas, residue 40%
~60% combustion air is sent by fire air nozzle and is mixed with flue gas, oxygen needed for providing coal dust after-flame, wherein four strand one
Grade burnout degree is entered in flue gas stream by level-one fire air nozzle 11 from the four corners in the middle part of burner hearth, is cut at burner hearth center
Circle where 10 center line of boiler furnace, jet direction is identical as flue gas eddy flow direction, strengthens level-one burnout degree and flue gas
Disturbance is conducive to the mixing for accelerating the two, promotes the after-flame of combustible in flue gas.
When two-stage over-fire wind snout standard-sized sheet, 40%~60% combustion air is by two-stage over-fire wind snout respectively in burner hearth
It is sent into middle part and updraught flue and is mixed with flue gas, ensure that reduces NOxThe effect of discharge amount；It is run when under boiler at low load
When, by closing all or part of second level fire air nozzle, combustion can be reduced while not reducing burnout degree effluxvelocity
Wind rate to the greatest extent is conducive to stablizing for coal dust under low load condition and burns.And control reducing agent reaction always is within the scope of temperature window.
Claims (5)
1. reducing agent denitration in the stove burner is sprayed in industrial coal powder boiler burner primary zone, it includes burner, recycling cigarette
Feed channel (16) and air-introduced machine (18), burner include primary air piping (1), direct-current secondary air hose (2), eddy flow inner second air pipe
(3), eddy flow outer second air pipe (4), first axis swirl vane (5) and the second axial swirl blades (6)；It is characterized by: it
It further include mixer (7), amino reductive delivery pipe (8), thick coal culm delivery pipe (9), three secondary air pipelines, three two
Secondary wind air pipeline valve (14), three flue gas recycled pipeline valves (15), three flue gas recycled branch pipe(tube)s (17), four
Level-one fire air nozzle (11) and multiple second level fire air nozzles (12)；Primary air piping (1), direct-current secondary air hose (2), in eddy flow
Secondary air channel (3) and eddy flow outer second air pipe (4) ecto-entad, which are sequentially coaxially arranged, to be mounted on boiler furnace (10), First air
Manage (1), direct-current secondary air hose (2), eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4) and boiler furnace (10) inner wall
Concordant setting, the second axial swirl blades (6) are mounted between direct-current secondary air hose (2) and eddy flow inner second air pipe (3), and first
Axial swirl blades (5) are mounted between eddy flow inner second air pipe (3) and eddy flow outer second air pipe (4), primary air piping (1) and mixed
Clutch (7) outlet connection, amino reductive delivery pipe (8) and thick coal culm delivery pipe (9) are connect with mixer (7) entrance, directly
Stream secondary air channel (2), eddy flow inner second air pipe (3), eddy flow outer second air pipe (4) are connect with secondary air pipeline, and every
A secondary air Pipe installing has a secondary air pipeline valve (14), flue gas recycled pipeline (16) and air-introduced machine
(18) it connects, and flue gas recycled pipeline (16) is connect with one end of three flue gas recycled branch pipe(tube)s (17) respectively, and each
One flue gas recycled pipeline valve (15), each flue gas recycled branch pipe(tube) are installed on flue gas recycled branch pipe(tube) (17)
(17) the other end is connect with the side wall of a secondary air pipeline respectively, and four level-one fire air nozzles (11) are mounted on furnace
Quadrangle in the middle part of thorax, multiple second level fire air nozzles (12) are arranged on updraught flue (13).
2. reducing agent denitration in the stove burner is sprayed in industrial coal powder boiler burner primary zone according to claim 1, special
Sign is: primary air piping (1) passes through direct-current secondary air hose (2) and exports with mixer (7) and connects.
3. reducing agent denitration in the stove burner is sprayed in industrial coal powder boiler burner primary zone according to claim 1, special
Sign is: each level-one fire air nozzle (11) is arranged towards boiler furnace (10) center, four level-one fire air nozzles (11)
Center line and the circle where boiler furnace (10) center line it is tangent.
4. reducing agent denitration in the stove burner is sprayed in industrial coal powder boiler burner primary zone according to claim 1, special
Sign is: burner is mounted on the center of boiler furnace (10) front wall of horizontal boiler.
5. reducing agent denitration in the stove burner is sprayed in industrial coal powder boiler burner primary zone according to claim 1, special
Sign is: burner is mounted on the center on boiler furnace (10) top of vertical boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811552506.8A CN109654484A (en) | 2018-12-18 | 2018-12-18 | Spray reducing agent denitration in the stove burner in industrial coal powder boiler burner primary zone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811552506.8A CN109654484A (en) | 2018-12-18 | 2018-12-18 | Spray reducing agent denitration in the stove burner in industrial coal powder boiler burner primary zone |
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| CN201811552506.8A Pending CN109654484A (en) | 2018-12-18 | 2018-12-18 | Spray reducing agent denitration in the stove burner in industrial coal powder boiler burner primary zone |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413569A (en) * | 2020-10-14 | 2021-02-26 | 上海交通大学 | High-speed jet flow over-fire air device with circulating flue gas |
| CN112628725A (en) * | 2021-01-12 | 2021-04-09 | 哈尔滨工业大学 | Radial grading low NOx pulverized coal combustion device |
| CN114278936A (en) * | 2021-12-30 | 2022-04-05 | 中国科学院力学研究所 | Staged combustion method and system for gaseous fuel |
| CN114353057A (en) * | 2021-12-03 | 2022-04-15 | 国家能源集团新能源技术研究院有限公司 | Over-fire air distribution system |
| WO2023071260A1 (en) * | 2021-10-26 | 2023-05-04 | 西安热工研究院有限公司 | Turbulent burner capable of simultaneously burning nh3 and pulverized coal |
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| CN107477573A (en) * | 2017-09-21 | 2017-12-15 | 哈尔滨工业大学 | A kind of heart in the burner for industrial coal powder boiler sprays the burner of ammonia |
| CN107559817A (en) * | 2017-09-21 | 2018-01-09 | 哈尔滨工业大学 | A kind of swirling pulverized coal combustion device and method using flue gas recirculation |
| CN107606606A (en) * | 2017-09-21 | 2018-01-19 | 哈尔滨工业大学 | Powder " Ω " shape industrial coal powder boiler is given at a kind of center using flue gas recirculation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413569A (en) * | 2020-10-14 | 2021-02-26 | 上海交通大学 | High-speed jet flow over-fire air device with circulating flue gas |
| CN112628725A (en) * | 2021-01-12 | 2021-04-09 | 哈尔滨工业大学 | Radial grading low NOx pulverized coal combustion device |
| CN112628725B (en) * | 2021-01-12 | 2021-11-12 | 哈尔滨工业大学 | Radial grading low NOx pulverized coal combustion device |
| WO2023071260A1 (en) * | 2021-10-26 | 2023-05-04 | 西安热工研究院有限公司 | Turbulent burner capable of simultaneously burning nh3 and pulverized coal |
| CN114353057A (en) * | 2021-12-03 | 2022-04-15 | 国家能源集团新能源技术研究院有限公司 | Over-fire air distribution system |
| CN114278936A (en) * | 2021-12-30 | 2022-04-05 | 中国科学院力学研究所 | Staged combustion method and system for gaseous fuel |
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Application publication date: 20190419 |
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| RJ01 | Rejection of invention patent application after publication |