CN109631020A - Combine denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler - Google Patents

Combine denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler Download PDF

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Publication number
CN109631020A
CN109631020A CN201811548793.5A CN201811548793A CN109631020A CN 109631020 A CN109631020 A CN 109631020A CN 201811548793 A CN201811548793 A CN 201811548793A CN 109631020 A CN109631020 A CN 109631020A
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CN
China
Prior art keywords
flue gas
air
level
burner hearth
coal powder
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Pending
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CN201811548793.5A
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Chinese (zh)
Inventor
陈智超
严蓉
杜贺
曾令艳
李争起
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN201811548793.5A priority Critical patent/CN109631020A/en
Publication of CN109631020A publication Critical patent/CN109631020A/en
Pending legal-status Critical Current

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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
    • 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
    • F23C9/003—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
    • 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
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)

Abstract

Combine denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler, it is related to industrial coal powder boiler technical field.The present invention is to solve NO existing for existing industrial coal powder boilerXThe problem that denitration effect is unstable, denitration is at high cost under discharge amount height, full load state.The present invention includes burner, burner hearth, updraught flue, flue gas recirculation system, multiple temperature sensors, multiple level-one fire air nozzles, multiple second level fire air nozzles and multiple amino reductive spouts, multiple amino reductive spouts and multiple level-one fire air nozzles are successively arranged in bore wall in the middle part of burner hearth from front to back, the circumferencial direction of amino reductive spout and level-one fire air nozzle respectively along burner hearth cross section is uniformly arranged, the front and rear sides of each amino reductive spout are respectively provided with a temperature sensor respectively, the front wall lateral edge horizontal direction of updraught flue is laid with multiple second level fire air nozzles.The present invention is used for industrial coal powder boiler.

Description

Combine denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler
Technical field
The present invention relates to industrial coal powder boiler technical fields, and in particular to a kind of full load suitable for industrial coal powder boiler Combine denitrification apparatus in furnace.
Background technique
The problems such as coal-burned industrial boiler generally existing boiler thermal efficiency in China's is low, pollutant discharge amount is big, coal-fired industry pot Furnace has become China NOXOne of primary discharge source of pollutant.As the Chinese government is for the pollutant of coal-burned industrial boiler The control of discharge is increasingly stringent.
It is more existing to improve the thermal efficiency and NO for boilerXEmission-reduction technology, such as a kind of utility model patent " middle-size and small-size work The low nitrogen coal powder burner of industry furnace " (China Patent No. ZL201420473036.7, authorized announcement date are in December, 2014 31 days, Authorization Notice No. CN204063029U call " file one " in the following text) at the middle part of flue gas stroke, one burnout degree nozzle is set Enter burner hearth for conveying burnout degree, forms the second combustion zone；Utility model patent is " in a kind of industry furnace grate SNCR furnace Denitrification apparatus " (China Patent No. ZL201320433916.7, authorized announcement date are 2 months 2014 26 days, application publication number For CN203454176U, call " file two " in the following text) above fire grate Vertical Channel be sequentially arranged from bottom to top natural gas afterburning spray gun, Ammonia spray gun, natural gas afterburning spray gun and spray ammonia spray gun are sprayed, then combustion gas body is handed over from rear wall, amino reductive from front wall along short transverse Fork sprays into.
A kind of patent of invention " vortex burner using flue gas recirculation for Industrial Stoves " (China Patent No. It is November 3, application publication number CN101876433A in 2010 for ZL201010213627.7, data of publication of application, calls in the following text " file three ") it is equipped between First air channel and inner second air channel and between inner second air channel and outer second air channel Annular outboard flue gas recirculation channel, flue gas recycled is sent directly into flue gas recirculation channel.
By taking the newly-built coal-fired hot-water boiler of 7MW or more as an example, " emission standard of air pollutants for boilers " (GB13271- 2014) in clear stipulaties its from October 1st, 2015, NOXDischarge amount must not exceed 300mg/m3, for key area It even more must not exceed 200mg/m3, the combustion system of existing Industrial Boiler has been difficult to meet the requirement of environmental protection.
Summary of the invention
The present invention is in order to solve NO existing for existing industrial coal powder boilerXDenitration effect under discharge amount height, full load state Problem unstable, denitration is at high cost, and then propose combined denitration dress in a kind of full load furnace suitable for industrial coal powder boiler It sets.
The technical solution adopted by the present invention to solve the above technical problem is:
Joint denitrification apparatus includes burner, burner hearth, uplink cigarette in a kind of full load furnace suitable for industrial coal powder boiler Road, flue gas recirculation system, multiple temperature sensors, multiple level-one fire air nozzles, multiple second level fire air nozzles and multiple The middle part of front wall on burner hearth is arranged in amino reductive spout, burner, and flue gas recirculation system is connect with burner, in burner hearth Multiple amino reductive spouts and multiple level-one fire air nozzles, amino reductive spray are successively arranged in the bore wall in portion from front to back Mouth and circumferencial direction of the level-one fire air nozzle respectively along burner hearth cross section are uniformly arranged, the front and back of each amino reductive spout Two sides are respectively provided with a temperature sensor respectively, and the arrival end of updraught flue and the outlet end of burner hearth connect, before updraught flue Wall lateral edge horizontal direction is laid with multiple second level fire air nozzles.
The beneficial effects of the present invention over the prior art is:
(1), the present invention, which is more advantageous to, reduces NOXDischarge amount
1. " file two " described device is directed to furnace grate, Vertical Channel is sequentially arranged naturally from bottom to top above fire grate Gas afterburning spray gun, spray ammonia spray gun, natural gas afterburning spray gun and spray ammonia spray gun, amino reductive spray into region and are not in reproducibility gas Atmosphere, can only occur denitration reaction in 850~1100 DEG C of temperature window, and denitration effect is poor.It compares " file two ", this patent institute It states technology and sprays into amino reductive from fire air nozzle point two-stage, amino reductive sprays into the area in furnace for strong reducing property atmosphere Domain, the temperature window of denitration reaction are expanded to 900~1200 DEG C of ranges, extend the time of origin of denitration reaction, reduce flue gas Middle NOXThe effect of concentration is more significant.
2. technology described in this patent sprays into amino reductive in the form of four strands of jet streams in the middle part of burner hearth in furnace and flue gas Uniformly mixing, the direction of amino reductive jet stream and burner it is oppositely oriented, after each stock jet stream sprays into inner flue gas of the stove, jet stream with Relative velocity between inner flue gas of the stove air-flow is big, and disturbance acutely, enhances mass transfer, accelerates the mixed process and reaction speed of the two Degree, enables denitration reaction to occur earlier；The mixed effect of the two is enhanced simultaneously, and ammonia in flue gas base reductant is dense after mixing Spend more uniform NO in flue gas in each section regionXDenitration reaction can occur in time, ensure that the effect of denitrating flue gas.
3. technology described in this patent has multiple temperature to pass in the upstream and downstream arranged for interval of wall surface where amino reductive spout Sensor is used for real-time measurement flue-gas temperature, provides adjustment foundation for amino reductive spout, control amino reductive jet stream sprays into The suitable region of flue-gas temperature, meanwhile, level-one burnout degree can adjust level-one burnout degree and spray into position by the swing of spout angle It sets, it is ensured that amino reductive can be by NO before contacting with level-one burnout degreeXSufficiently reduction.It is temperature sensor, swingable Amino reductive spout and level-one fire air nozzle corrdinated adjustment can accurately control the progress of denitrification process, guarantee amino also NO in former agent and flue gasXSufficiently reaction while, avoid amino reductive too early with oxygen containing level-one burnout degree haptoreaction Amino reductive is caused to be oxidized to NOXProcess, therefore be conducive to the NO for more effectively reducing inner flue gas of the stoveXContent.
4. the prior art described in " file two ", the case where being directed to load fluctuation, can only solely fire again The straying quatity of fuel and amino reductive improves denitration effect.Technology of the present invention, amino reductive spout central line and furnace The inclination angle alpha and level-one fire air nozzle center line of wall and the inclination angle beta of furnace wall can be adjusted.When load is sent out When changing, the data obtained using temperature sensor is foundations, by adjusting inclination alpha, β and burnout degree and amino reductive Straying quatity, the not only Temperature Distribution of the adjustable position for improving flame kernel and burner hearth but also can be in the premise of the abundant after-flame of coal dust Under, so that amino reductive is sprayed into the suitable strong reducing property region of temperature, guarantees uniformly mixed inner flue gas of the stove and amino reductive There is the sufficient time to carry out denitration reaction under reducing atmosphere, to ensure that technology of the present invention can be in full load rank Section is lower to have good denitration effect.
5. introducing flue gas recycled, flue gas recycled and air in the inside and outside secondary air duct of eddy flow in apparatus of the present invention Mixed in secondary air channels at different levels, when flue gas recirculation rate is set as 20%, flue gas recycled mix with air after gas Oxygen concentration, compared to the air oxygen concentration decline about 5% before mixing, enhances the reproducibility in burner centre area 16% or so Atmosphere makes coal dust concentrate in burner centre area reducing atmosphere burning, significantly reduces burner centre area NOXLife Cheng Liang；Meanwhile low-temperature flue gas be mixed into so that in burner hearth mean temperature reduce, by control flue gas straying quatity and spray into position It sets, controls the temperature levels of amino reductive reaction zone always in reaction temperature window, to guarantee amino reductive Effect effectively plays, and further decreases NOXProduction quantity.
6. " file three " described burner is between First air channel and inner second air channel and inner second air channel and outer Annular outboard flue gas recirculation channel is set between secondary air channel, flue gas recycled and air are layered entrance at burner nozzle In burner hearth, air layer air-flow oxygen concentration is high compared with flue gas recycled layer air-flow concentration, is just uniformly mixed after spraying into burner hearth a distance, When coal dust enters oxygen content high air layer, NOXDischarge amount increases.It compares " file three ", cigarette is not separately provided in apparatus of the present invention Gas recirculation line, flue gas recycled mix in each secondary air channel with air, at burner nozzle there is no stratification of hot gas into Enter, not only saved the mixed process of flue gas and air in furnace, but also burner outlet region radial direction oxygen concentration is made to be evenly distributed, protects It has demonstrate,proved coal dust and has stablized burning, while having reinforced the reducing atmosphere in burner centre region, extended coal dust under reducing atmosphere Residence time, it is suppressed that the NO in burner centre regionXDischarge amount.
(2), the present invention is conducive to the after-flame of coal dust, improves boiler thermal efficiency
" file one " described burner arranges a burnout degree nozzle by one burnout degree at the middle part of flue gas stroke It is sent into burner hearth, when boiler load reduces, the speed of burnout degree jet stream declines, and the flue gas of burnout degree and eddy flow is more difficult in burner hearth It is uniformly mixed, regional area oxygen concentration is low, and the imperfect combustion object in the region is caused to be unable to fully after-flame.It compares " file one ", this In patent, level-one burnout degree is sent into the middle part of burner hearth with multiple spot pattern, and forms a strong swirling eddy, with flue gas Strong disturbance is generated, the mixed process of combustible and burnout degree in flue gas is accelerated, the combustion reaction of combustible is able to It carries out in advance, the time for extending combustion reaction progress improves boiler thermal efficiency to ensure that the after-flame of coal dust；In addition, Technology described in this patent uses two-stage over-fire wind, when boiler load reduces, by closing all or part of second level burnout degree Spout while guaranteeing to stablize burning, and does not reduce the speed of level-one burnout degree jet stream, and burnout degree remains to rapidly and flue gas is mixed It closes uniformly, ensure that the abundant after-flame of coal dust energy under underload, improve boiler thermal efficiency.
(3), the present invention can improve boiler to the adaptability of load
Technology of the present invention arranges two-stage over-fire wind snout along flue gas flow, and first order fire air nozzle is arranged in furnace In the middle part of thorax, second level fire air nozzle is arranged horizontally in the front wall side of updraught flue.By the air quantity and the penetrating that change burnout degree Angle adjusts furnace flame center, control in-furnace temperature distribution.Furthermore by setting flue gas recycled, flue gas is adjusted Infeed amount can effectively control the temperature levels of breeze airflow fire area, guarantee that boiler still can under different load state Enough realize low nitrogen oxide burning.
Detailed description of the invention
Fig. 1 is overall structure diagram of the present invention using the horizontal burner hearth boiler plant of one group of amino reductive spout 5；
Fig. 2 is overall structure diagram of the present invention using the vertical furnace chamber boiler plant of one group of amino reductive spout 5；
Fig. 3 is overall structure diagram of the present invention using the horizontal burner hearth boiler plant of multiple groups amino reductive spout 5；
Fig. 4 is overall structure diagram of the present invention using the vertical furnace chamber boiler plant of multiple groups amino reductive spout 5；
Fig. 5 is the schematic cross-section in the present invention at 3 middle part amino reductive spout 5 of burner hearth；
Fig. 6 is the schematic cross-section in the present invention in burner hearth 3 at departmental level fire air nozzle 6；
Fig. 7 is the arrangement schematic diagram of 8 front wall side second level fire air nozzle 7 of updraught flue in the present invention.
Wherein the direction of arrow indicates the flow direction of burnout degree gas.
Specific embodiment
Specific embodiment 1: illustrating that present embodiment, one kind described in present embodiment are suitable for work in conjunction with Fig. 1 to Fig. 7 Joint denitrification apparatus includes burner 1, burner hearth 3, updraught flue 8, flue gas recirculation system in the full load furnace of industry pulverized-coal fired boiler 9, multiple temperature sensors 4, multiple level-one fire air nozzles 6, multiple second level fire air nozzles 7 and multiple amino reductive spouts 5, the middle part of front wall 2 on burner hearth 3 is arranged in burner 1, and flue gas recirculation system 9 is connect with burner 1, the thorax at 3 middle part of burner hearth Multiple amino reductive spouts 5 and multiple level-one fire air nozzles 6, amino reductive spout 5 are successively arranged on wall from front to back Circumferencial direction with level-one fire air nozzle 6 respectively along 3 cross section of burner hearth is uniformly arranged, before each amino reductive spout 5 Two sides are respectively provided with a temperature sensor 4 respectively afterwards, and the arrival end of updraught flue 8 is connect with the outlet end of burner hearth 3, uplink cigarette The front wall lateral edge horizontal direction in road 8 is laid with multiple second level fire air nozzles 7.
A kind of denitration in the stove suitable for the boiler full load stage and the low NO of flue gas recirculation for being equipped with after-flame wind systemXCombustion Burn device.Along flue gas flow direction, amino reductive spout 5, level-one combustion have been sequentially arranged on 8 wall surface of burner hearth 3 and updraught flue Wind snout 6 and second level fire air nozzle 7 to the greatest extent.
When boiler operatiopn, combustion air needed for coal dust and coal dust initiation combustion is sent into burner hearth 3 by low nitrogen turbulent burner, Coal dust catches fire under high temperature reflux flue gas to be lighted, and primary zone excess air factor is between 0.48~0.72, and coal dust is strong It burns under reducing atmosphere, is conducive to inhibit NOXGeneration, while lower excess air coefficient makes primary zone flame temperature Control is at 1300 DEG C hereinafter, avoiding generating a large amount of thermal NOsX.Reducing agent jet stream is sprayed into strong reduction by amino reductive spout 4 Property atmosphere under primary zone, the NO that will generate in flue gas of denitration reaction occursXIt is reduced into N2.Remaining 40%~60% combustion-supporting sky Gas is sent into burner hearth 3 via two-stage over-fire wind snout, guarantees the after-flame of combustible in flue gas, and level-one burnout degree jet stream is from burner hearth 3 four Week is injected in eddy flow flue gas, strengthens the disturbance of flue gas and burnout degree, is more advantageous to the after-flame of combustible.
When running under boiler normal duty, two-stage over-fire wind snout standard-sized sheet, 40%~60% combustion air is by two-stage Fire air nozzle is sent into 3 middle part of burner hearth and updraught flue 8 mixes with flue gas respectively, and ensure that reduces NOXThe effect of discharge amount Fruit.When running under boiler at low load, by closing all or part of second level fire air nozzle 7, after-flame can not reduced While wind effluxvelocity, reduce burnout degree rate, is conducive to stablizing for coal dust under low load condition and burns, while passing through amino again The adjustment at the inclination angle of reducing agent spout 5 and level-one fire air nozzle 6 guarantees that flue gas still can be effectively reduced under low load condition In NOXContent.
Combine level-one fire air nozzle 6 and second level fire air nozzle in denitrification apparatus in the full load furnace of industrial coal powder boiler Burnout degree in 7 can direct current also eddy flow penetrating.
Specific embodiment 2: illustrating present embodiment, the spray of amino reductive described in present embodiment in conjunction with Fig. 1 to Fig. 6 The first adjustable inclination angle α, the center line and burner hearth of level-one fire air nozzle 6 are equipped between the center line of mouth 5 and the bore wall of burner hearth 3 The second adjustable inclination angle β is equipped between 3 bore wall.The technical features not disclosed in this embodiment and one phase of specific embodiment Together.
The amino reductive direct jet of high speed is sent into burner hearth 3 by amino reductive spout 5, and jet stream is in 3 section of burner hearth Center is cut in the reducing agent jet stream imaginary circle 10 with certain diameter, and multiple level-one fire air nozzles 6 are along burner hearth 3 Section circumferential direction is evenly arranged, and each stock jet stream for tilting injection, which is cut in one in 3 kernel of section position of burner hearth, has certain diameter Level-one burnout degree jet stream imaginary circle 11.
Adjust amino reductive spout 5, the first adjustable inclination angle of adjustable 5 center line of amino reductive spout and bore wall α, control amino reductive jet stream shifts to an earlier date (90 ° of α <) or postpones (90 ° of α >) to be mixed with flue gas, adjusts level-one fire air nozzle 6, it is equipped with the second adjustable inclination angle β between adjustable 6 center line of level-one fire air nozzle and bore wall, controls level-one burnout degree jet stream (90 ° of β <) or postponement (90 ° of β >) are mixed with flue gas in advance.At the upstream and downstream of 5 place wall surface of amino reductive spout, Multiple temperature sensors 4 being spaced apart from each other are disposed with, provide foundation for the pivot angle adjustment of amino reductive spout 5.
Specific embodiment 3: illustrating present embodiment in conjunction with Fig. 1 to Fig. 7, burner 1 described in present embodiment includes one Secondary air hose 1-1, direct current inner second air pipe 1-2, eddy flow inner second air pipe 1-3 and eddy flow outer second air pipe 1-4, primary air piping 1- 1, direct current inner second air pipe 1-2, eddy flow inner second air pipe 1-3 and eddy flow outer second air pipe 1-4 are set gradually from the inside to the outside, flue gas Recirculating system 9 includes flue gas recycled pipeline 9-3, flue gas recycled branch pipe(tube) 9-4 and air-introduced machine 9-5, flue gas recycled pipe The arrival end of road 9-3 is connect with air-introduced machine 9-5, the outlet end of flue gas recycled pipeline 9-3 and direct current inner second air pipe 1-2, rotation It flows between inner second air pipe 1-3 and eddy flow outer second air pipe 1-4 respectively by flue gas recycled branch pipe(tube) 9-4 connection, recycling Flue gas branch pipe(tube) 9-4 is equipped with flue gas recycled pipeline valve 9-2, direct current inner second air pipe 1-2, eddy flow inner second air pipe 1-3 Secondary air pipeline valve 9-1 is respectively equipped with the arrival end of eddy flow outer second air pipe 1-4.It is undocumented in present embodiment Technical characteristic is identical with embodiment two.
The arrival end of flue gas recycled pipeline 9-3 is equipped with air-introduced machine 9-5, and flue gas recycled is followed again from boiler tail introducing Ring flue 9-3.Direct current inner second air pipe 1-2, eddy flow inner second air pipe 1-3 and eddy flow outer second air pipe 1-4 arrival end are set There is secondary air pipeline valve 9-1.The mixed airflow of conveying flue gas recycled and air, each Secondary Air are empty in each secondary air channel The adjustable air capacity for being sent into each secondary air channel of feed channel valve 9-1, each flue gas recycled pipeline valve 9-2 be adjusted aperture with Reasonable distribution is sent into the ratio of the flue gas recycled of each secondary air channel.
Specific embodiment 4: illustrating present embodiment in conjunction with Fig. 1 to Fig. 6, burner hearth 3 described in present embodiment is horizontal chamber furnace (oven) Thorax or vertical furnace chamber.The technical features not disclosed in this embodiment are identical as specific embodiment one, two or three.
Specific embodiment 5: illustrating present embodiment, the multiple amino reduction of present embodiment in conjunction with Fig. 1 to Fig. 6 Agent spout 5 is arranged to one or more groups of, and every group of amino reductive spout 5 includes four amino reductive spouts 5, amino reductive The four corners at 3 middle part of burner hearth are arranged in spout 5.The technical features not disclosed in this embodiment and four phase of specific embodiment Together.
Specific embodiment 6: illustrate present embodiment in conjunction with Fig. 1 to Fig. 6, described in present embodiment when multiple amino also When former agent spout 5 is arranged to multiple groups, equidistantly interval is arranged for amino reductive spout 5 and temperature sensor 4.In present embodiment Undocumented technical characteristic is identical as specific embodiment five.
Specific embodiment 7: illustrate present embodiment in conjunction with Fig. 1 to Fig. 6, the spray of level-one burnout degree described in present embodiment Mouthfuls 6 with amino reductive spout 5 in the direction of the air flow at a distance from for 3~5m.The technical features not disclosed in this embodiment with Specific embodiment one, two, three, five or six are identical.
Specific embodiment 8: illustrate present embodiment in conjunction with Fig. 1 to Fig. 7, the spray of second level burnout degree described in present embodiment Interval is equipped between mouth 7 and the corner of burner hearth 3.The technical features not disclosed in this embodiment and seven phase of specific embodiment Together.
Specific embodiment 9: illustrating present embodiment in conjunction with Fig. 1 to Fig. 7, burner 1 described in present embodiment is low nitrogen Vortex burner.The technical features not disclosed in this embodiment are identical as specific embodiment eight.
Specific embodiment 10: illustrate present embodiment in conjunction with Fig. 1 to Fig. 7, the spray of level-one burnout degree described in present embodiment The jet stream rotation direction of mouth 6 is identical as the rotation direction of burner 1, the jet stream rotation direction and the rotation direction phase of burner 1 of amino reductive spout 5 Instead.The technical features not disclosed in this embodiment are identical as specific embodiment eight or nine.
Working principle
The present invention forms two-stage low temperature reaction zone by the way that two-stage over-fire wind is arranged inside burner hearth, and amino is also in low-temperature space Former agent uniformly sprays into inside burner hearth in circle type, guarantees NO in amino reductive and flue gasXAbundant reaction.The present invention is logical simultaneously Setting flue gas recirculation is crossed, flue gas recycled is sent into burner hearth by secondary air channels at different levels, the temperature levels in furnace is controlled, strengthens The reducing atmosphere in burner centre area makes breeze airflow concentrate in burner centre area reducing atmosphere burning.By upper The mode of stating guarantees that boiler still being capable of low NO under full load stateXStablize burning.

Claims (10)

1. combining denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler, it is characterised in that: described a kind of applicable It include burner (1), burner hearth (3), updraught flue (8), flue gas in combining denitrification apparatus in the full load furnace of industrial coal powder boiler Recirculating system (9), multiple temperature sensors (4), multiple level-one fire air nozzles (6), multiple second level fire air nozzles (7) and The middle part of front wall (2), flue gas recirculation system (9) is arranged on burner hearth (3) in multiple amino reductive spouts (5), burner (1) It is connect with burner (1), is successively arranged multiple amino reductive spouts (5) and more in the bore wall in the middle part of burner hearth (3) from front to back A level-one fire air nozzle (6), amino reductive spout (5) and level-one fire air nozzle (6) are respectively along burner hearth (3) cross section Circumferencial direction is uniformly arranged, and the front and rear sides of each amino reductive spout (5) are respectively provided with a temperature sensor (4) respectively, The arrival end of updraught flue (8) is connect with the outlet end of burner hearth (3), and the front wall lateral edge horizontal direction of updraught flue (8) is laid There are multiple second level fire air nozzles (7).
2. combining out of stock device, feature in a kind of full load furnace suitable for industrial coal powder boiler according to claim 1 It is: is equipped with the first adjustable inclination angle (α) between the center line of the amino reductive spout (5) and the bore wall of burner hearth (3), level-one The second adjustable inclination angle (β) is equipped between the center line of fire air nozzle (6) and the bore wall of burner hearth (3).
3. combining denitrification apparatus, feature in a kind of full load furnace suitable for industrial coal powder boiler according to claim 2 Be: the burner (1) include primary air piping (1-1), direct current inner second air pipe (1-2), eddy flow inner second air pipe (1-3) and Eddy flow outer second air pipe (1-4), primary air piping (1-1), direct current inner second air pipe (1-2), eddy flow inner second air pipe (1-3) and rotation Stream outer second air pipe (1-4) is set gradually from the inside to the outside, and flue gas recirculation system (9) includes flue gas recycled pipeline (9-3), again Circulating flue gas branch pipe(tube) (9-4) and air-introduced machine (9-5), the arrival end and air-introduced machine (9-5) of flue gas recycled pipeline (9-3) are even It connects, the outlet end of flue gas recycled pipeline (9-3) and direct current inner second air pipe (1-2), eddy flow inner second air pipe (1-3) and eddy flow It is connected respectively by flue gas recycled branch pipe(tube) (9-4) between outer second air pipe (1-4), on flue gas recycled branch pipe(tube) (9-4) Equipped with flue gas recycled pipeline valve (9-2), direct current inner second air pipe (1-2), eddy flow inner second air pipe (1-3) and eddy flow outer two The arrival end of secondary air hose (1-4) is respectively equipped with secondary air pipeline valve (9-1).
4. according to claim 1, combine denitrification apparatus in a kind of 2 or 3 full load furnaces suitable for industrial coal powder boiler, Be characterized in that: the burner hearth (3) is horizontal burner hearth or vertical furnace chamber.
5. combining denitrification apparatus, feature in a kind of full load furnace suitable for industrial coal powder boiler according to claim 4 Be: the multiple amino reductive spout (5) is arranged to one or more groups of, and every group of amino reductive spout (5) includes four Amino reductive spout (5), the four corners that amino reductive spout (5) is arranged in the middle part of burner hearth (3).
6. combining denitrification apparatus, feature in a kind of full load furnace suitable for industrial coal powder boiler according to claim 5 It is: described when multiple amino reductive spouts (5) are arranged to multiple groups, amino reductive spout (5) and temperature sensor (4) Equidistant interval setting.
7. according to claim 1, combining out of stock dress in a kind of full load furnace suitable for industrial coal powder boiler of 2,3,5 or 6 Set, it is characterised in that: the level-one fire air nozzle (6) and amino reductive spout (5) in the direction of the air flow at a distance from for 3~ 5m。
8. combining denitrification apparatus, feature in a kind of full load furnace suitable for industrial coal powder boiler according to claim 7 It is: is equipped with interval between the second level fire air nozzle (7) and the corner of burner hearth (3).
9. combining denitrification apparatus, feature in a kind of full load furnace suitable for industrial coal powder boiler according to claim 8 Be: the burner (1) is low nitrogen vortex burner.
10. combine denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler according to claim 8 or claim 9, Be characterized in that: the jet stream rotation direction of the level-one fire air nozzle (6) is identical as the rotation direction of burner (1), amino reductive spout (5) jet stream rotation direction is oppositely oriented with burner (1).
CN201811548793.5A 2018-12-18 2018-12-18 Combine denitrification apparatus in a kind of full load furnace suitable for industrial coal powder boiler Pending CN109631020A (en)

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CN112628725A (en) * 2021-01-12 2021-04-09 哈尔滨工业大学 Radial grading low NOx pulverized coal combustion device
CN115949936A (en) * 2022-11-01 2023-04-11 天津大学 Water-spraying hydrogenation gas-solid phase two-phase burner for ultralow-nitrogen ammonia coal co-combustion

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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
CN107606602A (en) * 2017-09-21 2018-01-19 哈尔滨工业大学 A kind of horizontal boiler of SNCR and OFA interlaced arrangements
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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CN201363716Y (en) * 2008-12-29 2009-12-16 北京光耀电力设备股份有限公司 Boiler capable of realizing low exhaustion of nitrogen oxide
CN107559823A (en) * 2017-09-21 2018-01-09 哈尔滨工业大学 A kind of denitration in the stove and the low nitrogen combustion apparatus of two-stage over-fire wind arrangement
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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
CN115949936A (en) * 2022-11-01 2023-04-11 天津大学 Water-spraying hydrogenation gas-solid phase two-phase burner for ultralow-nitrogen ammonia coal co-combustion

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