CN107975782B - A kind of the fractional combustion boiler system and method for slag combustion with meagre oxygen catalysis oxidation - Google Patents

A kind of the fractional combustion boiler system and method for slag combustion with meagre oxygen catalysis oxidation Download PDF

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CN107975782B
CN107975782B CN201711175034.4A CN201711175034A CN107975782B CN 107975782 B CN107975782 B CN 107975782B CN 201711175034 A CN201711175034 A CN 201711175034A CN 107975782 B CN107975782 B CN 107975782B
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combustion
meagre oxygen
slag
air
gas outlet
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CN107975782A (en
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刘银河
张旭
王璐凯
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Xian Jiaotong University
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Xian Jiaotong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
    • 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
    • F23L15/00—Heating of air supplied for combustion
    • F23L15/04—Arrangements of recuperators
    • 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
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Abstract

The invention discloses a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation and methods, comprising: combustion with meagre oxygen room and CO catalytic oxidizing equipment；Cavity is contained in the inside of combustion with meagre oxygen room, and the upper end of combustion with meagre oxygen room is provided with exhanst gas outlet；The exhanst gas outlet arranged downstream of combustion with meagre oxygen room has secondary combustion chamber；The smoke inlet of secondary combustion chamber is connected with the exhanst gas outlet of combustion with meagre oxygen room；The exhanst gas outlet arranged downstream of secondary combustion chamber has benefit air compartment；The smoke inlet for mending air compartment is connected by the exhanst gas outlet with secondary combustion chamber；The exhanst gas outlet arranged downstream for mending air compartment has CO catalytic oxidizing equipment；The smoke inlet of CO catalytic oxidizing equipment is connected with the exhanst gas outlet for mending air compartment.The present invention can reach efficient low NO by the way that coal grading burnsxDischarge reduces atmosphere pollution；Do not include SCR denitration device, can avoid the catalyst optimum temperature encountered in denitrification process limitation, the spray serious problems such as ammonia mixing uniformity and catalyst waste disposal.

Description

A kind of the fractional combustion boiler system and method for slag combustion with meagre oxygen catalysis oxidation
Technical field
The present invention relates to boiler technology field, in particular to a kind of fractional combustion boiler of slag combustion with meagre oxygen catalysis oxidation System and method.
Background technique
As Chinese national economy is growing, every profession and trade electricity consumption increases year by year, and each power industry is like the mushrooms after rain It grows rapidly.In recent years, Coal-fired group persistently occupies leadership, will not occur within a very long time from now on obvious Variation.These fired power generating units bring electric energy that we depend on for existence simultaneously, consume a large amount of non-renewable fossil energies, fossil Fuel combustion can generate nitrogen oxides (NOx), it is one of Air Pollutants, certain shadow can be caused to ecological environment It rings.
In recent years, domestic and international coal fired power plant low nitrogen burning mostly uses following methods: air staged combustion technology, i.e. burning institute It needs air capacity point two-stage to be sent into, completes a burning point two-stage, this method is in the presence of that can cause burner hearth efficiency to decline, and slagging is rotten in burner hearth The problem of erosion；Low oxygen combustion method is burnt under low excess air coefficient, can be reduced fuel type NOxGeneration, but due to combustion Phenomena such as incomplete, the reducibility gas such as residual fraction CO in flue gas of burning, will lead to ash content ash fusion point reduces, Boiler Heating Surfaces； Low NOxBurner method reduces ignition zone oxygen temperature and concentration, inhibits NO to greatest extent by changing coal-air ratioxGeneration, but its There are problems that structure is complicated, easy slagging.
What Denitration Technology in Coal Burning Plant was most widely used at present is selective catalytic reduction (SCR) technology, this aspect skill Art is more mature, is at home and abroad widely used.However the technology often faces many serious problems, such as SCR in the application Catalyst activity temperature range is 320 DEG C~400 DEG C, and denitrification apparatus inlet flue gas temperature is lower than active temperature, denitration effect under underload Rate is poor；The waste disposal problem of SCR catalyst and ammonia；Influence problem of the ammonia spraying amount to subsequent thermal face in denitrification process；Spray Can ammonia be uniformly mixed with flue gas.These there are the problem of will lead to denitration efficiency under coal-burning boiler full load and be difficult to reach state Family requires horizontal.
Summary of the invention
The purpose of the present invention is to provide a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation and method, To solve above-mentioned technical problem.The fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation of the invention pass through by Coal grading burning can reach efficient low NOxDischarge reduces atmosphere pollution；It does not include SCR denitration device, can avoid denitration The catalyst optimum temperature encountered in journey limits, sprays the serious problems such as ammonia mixing uniformity and catalyst waste disposal.For Non- slag and fluidized bed combustion chamber can also be used in other coals.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation, comprising: combustion with meagre oxygen room and CO are catalyzed oxygen Makeup is set；Cavity is contained in the inside of combustion with meagre oxygen room, and the upper end of combustion with meagre oxygen room is provided with exhanst gas outlet；Under combustion with meagre oxygen room Portion's side wall is equipped with several wind inlets；One time wind inlet is connected with the cavity of the inside of combustion with meagre oxygen room；Combustion with meagre oxygen The exhanst gas outlet arranged downstream of room has secondary combustion chamber；Secondary combustion chamber is provided with smoke inlet, exhanst gas outlet and several first The smoke inlet of high temperature air entrance, secondary combustion chamber is connected with the exhanst gas outlet of combustion with meagre oxygen room；The cigarette of secondary combustion chamber Gas outlet downstream is disposed with benefit air compartment；It mends air compartment and is provided with smoke inlet, exhanst gas outlet and several second high temperature air entrances, mend The smoke inlet of air compartment is connected by the exhanst gas outlet with secondary combustion chamber；The exhanst gas outlet arranged downstream for mending air compartment has CO to urge Change oxidation unit；CO catalytic oxidizing equipment is provided with smoke inlet, exhanst gas outlet, the smoke inlet and benefit of CO catalytic oxidizing equipment The exhanst gas outlet of air compartment is connected.
Further, the exhanst gas outlet top of combustion with meagre oxygen room is communicated with the first vertical flue；In first vertical flue from Under supreme be disposed with convection heating surface and secondary combustion chamber；The outlet of first vertical flue is connected with horizontal flue, horizontal flue In be disposed with convection heating surface；The second down-set vertical flue of the outlet of horizontal flue, in the second vertical flue from It has been sequentially arranged under and has mended air compartment, CO catalytic oxidizing equipment, economizer, air preheater and smoke outlet.
Further, the bottom of combustion with meagre oxygen room is equipped with melting slag bath；The lower end of melting slag bath is provided with slag tap mouth； The cavity inside of combustion with meagre oxygen room is laid with wall with refractory lining, refracto and constitutes adiabatic environment.
Further, the cavity of the inside of combustion with meagre oxygen room is cylinder, and the quantity of a wind inlet is four, Mei Geyi Secondary wind inlet is all set on the side wall of close lower end of combustion with meagre oxygen room, four wind inlets with combustion with meagre oxygen chamber interior The central axis of cavity forms an angle, and coal is made to form cyclone firing in combustion with meagre oxygen room.
Further, layered arrangement above and below several first high temperature air entrances of secondary combustion chamber；Mend several the of air compartment Layered arrangement above and below two high temperature air entrances.
Further, CO catalyst uses CeO in CO catalytic oxidizing equipment2Aeroge supports CuO catalyst.
Further, it keeps excess air coefficient less than 1 in second-time burning room, but is greater than excess air in combustion with meagre oxygen room Coefficient.
Further, it is 0.7~0.8 that excess air coefficient is kept in combustion with meagre oxygen room；Second-time burning was kept in room Measuring air coefficient is 0.9.
A kind of staged-combustion method of slag combustion with meagre oxygen catalysis oxidation, comprising the following steps:
Step A, coal dust, water and air are entered the cavity of the inside of combustion with meagre oxygen room through a wind inlet, are fired using whirlwind Burning mode forms high-temp combustion gasification zone in the lower part of cavity, keeps excess air coefficient to be less than in high-temp combustion gasification zone 1, maintaining reaction is combustion with meagre oxygen atmosphere；
Step B, the cinder for generation of burning are thrown on the inner wall of combustion with meagre oxygen room, then under the action of swirling eddy It flows into bottom and melts slag bath, the accumulation of slag amount is discharged through cooling from slag-drip opening afterwards to a certain degree；Imperfect combustion high-temperature flue gas On pass through exhanst gas outlet discharge, cooling by the convection heating surface of sparse arrangement, flue gas after cooling enters secondary combustion chamber；
Step C is uniformly passed through air by the layering of the first high temperature air entrance, through cooling flue gas in secondary combustion chamber It burns away in secondary combustion chamber, excess air coefficient is 0.9 in secondary combustion chamber；
Step D after the flue gas after second-time burning is exchanged heat by convection heating surface, into air compartment is mended, mends air compartment by the The layering of two high temperature air entrances is uniformly passed through air；
Step E, mixed gas enter CO catalytic oxidizing equipment, in CO catalytic oxidizing equipment excess air coefficient be 1~ 1.05, the CO in CO catalytic oxidizing equipment in imperfect combustion flue gas is all aoxidized, then flue gas flow through economizer with Air preheater (8), temperature are discharged after being reduced to exhaust gas temperature from smoke outlet (9).
Compared with prior art, the invention has the following advantages:
The fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation of the invention by by coal successively in combustion with meagre oxygen Room and secondary combustion chamber internal classification carry out burning and CO catalysis oxidation, can reach efficient low NOxDischarge reduces atmosphere pollution. The boiler system of the invention high-temp combustion under reducing atmosphere, and secondary combustion chamber, mend air compartment in low-temperature burning almost Without NOxGeneration, there is no need to install SCR denitration device additional, can avoid denitrification process in encounter catalyst optimum temperature limitation, Spray the serious problems such as ammonia mixing uniformity and catalyst waste disposal.Coal dust, water and high temperature air enter poor through primary air nozzle The cavity of the inside of oxygen combustion chamber, the lower part of cavity are formed as high-temp combustion gasification zone, and slag amount is accumulated to a certain degree afterwards through arranging Jiao Kou discharge.In secondary combustion chamber, appropriate high temperature air is passed through by high temperature air entrance, through cooling flue gas in secondary combustion chamber In burn away.Flue gas cooling device can reduce the temperature of flue gas, cool down to the flue gas passed through.Air compartment is mended for supplementing height Warm air, to guarantee that excess air coefficient when subsequent catalyst oxidation is approximately 1.Catalyst carrier in CO catalytic oxidizing equipment CO imperfect combustion in flue gas can all be aoxidized, reduce environmental pollution by the CO catalyst of upper attachment.Combustion with meagre oxygen is adopted in room With melting combustion with meagre oxygen mode, for excess air coefficient less than 1, maintaining reaction is oxygen deprivation high-temp combustion atmosphere, the fuel type of generation NOxIt is greatly decreased, converts nitrogen for most of nitrogen, then imperfect combustion flue gas is in secondary combustion chamber, benefit air compartment relaying Afterflame is burnt, in flue gas remaining CO in CO catalytic oxidizing equipment by CO catalyst complete oxidation, since flue gas is cold through each flue gas But device is cooling, and ignition temperature is lower, the temperature mode NO of generationxIt reduces, NO can be effectively reduced in the way of fractional combustionx's Discharge.
Further, by the way that liquid state slag discharging device is arranged, using slag tap mode, boiler system can be improved catches slag Rate increases its adaptation range to coal, improves coal dust burn-off rate, and heating surface can be made clean, and dust content reduces, and makes boiler Back-end surfaces are stained with ash and abrasion is reduced.Boiler system of the invention uses slag tap mode, reaction zone above melting slag bath Temperature is higher than grey melting temperature.The cinder that burning generates is thrown to wall surface in combustion with meagre oxygen room under the action of swirling eddy, then It flows into bottom and melts slag bath, be discharged after cooling from slag tap mouth.Melting ash content in slag bath plays the gasification, and combustion of residual coke To being catalyzed and providing the effect of heat source, the stability of burning is maintained, and improve charcoal percent conversion.
Further, the central axis of a wind inlet and combustion with meagre oxygen chamber interior cavity forms an angle, and First air inclines It is tiltedly sent into, four wind inlets being arranged on the lower sides of combustion with meagre oxygen room, whirlwind can be formed in gasification zone, form coal dust Cyclone firing mode.
Further, wall with refractory lining, refracto is laid on the water-cooling wall of the inside of cavity may make up adiabatic environment, can play heat-insulated and protect The effect of temperature.
Further, several convection heating surfaces of sparse arrangement can reduce the temperature of flue gas in flue in flue；Secondary Combustion chamber uses low temperature combustion mode, and temperature is lower than combustion with meagre oxygen room temperature, and temperature is lower than the ash fusion point of most coals, no It can cause convection heating surface surface contamination, be able to maintain the cleaning on convection heating surface surface, and exchange heat and imitate to each convection heating surface Fruit requirement is lower, and the sparse arrangement of convection heating surface, escapable cost, develop skill economy.
Further, the high temperature air entrance layered arrangement of secondary combustion chamber and benefit air compartment, can uniformly be passed through suitable high Warm air improves uniformity.
Further, the CO catalyst in CO catalytic oxidizing equipment uses CeO2Aeroge supports CuO catalyst, and CuO is urged Agent is cheap, there is higher economy.CuO catalyst activity temperature, can be by imperfect combustion flue gas near 600 DEG C In CO preferably aoxidize.
Further, by setting economizer and air preheater, the utilization of the coal of boiler system of the invention can be improved Rate reduces the heat of the flue gas of discharge.
The staged-combustion method of slag combustion with meagre oxygen catalysis oxidation of the invention is used for any of the above-described kind of slag combustion with meagre oxygen The fractional combustion boiler system of catalysis oxidation, can effectively reduce NOxDischarge.For other coals, can also be used non-slag and Fluidized bed combustion chamber.
Further, whole excess air coefficient is lower, can reduce heat loss due to exhaust gas, improves boiler thermal efficiency.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation of the invention；
In Fig. 1: 1, combustion with meagre oxygen room；2, convection heating surface；3, secondary combustion chamber；4, convection heating surface；5, air compartment is mended；6, CO catalytic oxidizing equipment；7, economizer；8, air preheater；9, smoke outlet；10, a wind inlet；11, slag tap mouth；12, Wall with refractory lining, refracto；13, the exhanst gas outlet of combustion with meagre oxygen room；14, slag bath is melted；15, high temperature air entrance；16, high temperature air entrance.
Specific embodiment
It elaborates in the following with reference to the drawings and specific embodiments to the present invention.
As shown in fig.1, a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation of the invention, including it is poor Oxygen combustion chamber 1, CO catalytic oxidizing equipment 6 and boiler body other equipment.
Combustion with meagre oxygen room 1 is located at boiler system burner hearth position, boiler body other equipment include sparse arrangement convection current by Air compartment 5, economizer 7, air preheater 8 and smoke outlet 9, CO catalysis oxidation, convection heating surface 4, are mended at secondary combustion chamber 3 in hot face 2 The setting of device 6 is in economizer 7 and mends between air compartment 5.
1 top of combustion with meagre oxygen room is communicated with the first vertical flue；Be disposed with from bottom to up in first vertical flue convection current by Hot face 2 and secondary combustion chamber 3；The outlet of first vertical flue is connected with horizontal flue, and convection heating surface 4 is arranged in horizontal flue In；The second down-set vertical flue of the outlet of horizontal flue has been sequentially arranged from top to bottom in the second vertical flue Mend air compartment 5, CO catalytic oxidizing equipment 6, economizer 7, air preheater 8 and smoke outlet 9.
Combustion with meagre oxygen room 1 is the reproducibility gasification reaction atmosphere of insulation, including a wind inlet 10, melting slag bath 14, liquid The exhanst gas outlet 13 of state slag-drip opening 11, wall with refractory lining, refracto 12 and combustion with meagre oxygen room.Combustion with meagre oxygen room 1 is internal cavities, and cavity is cylinder Shape, cavity inside are laid with wall with refractory lining, refracto 12 and constitute adiabatic environment, and arrangement water-cooling wall constitutes furnace wall inside wall with refractory lining, refracto 12.Combustion with meagre oxygen room A wind inlet 10 there are four setting altogether on 1 lower sides, four wind inlets 10 are and in 1 internal cavities of combustion with meagre oxygen room Mandrel line forms an angle, and First air tilts feeding along a tangential direction, and coal is made to form cyclone firing side in combustion with meagre oxygen room 1 Formula.Under the action of swirling eddy, the cinder for generation of burning is thrown on the inner wall of combustion with meagre oxygen room 1, then flows into bottom Slag bath 14 is melted, the accumulation of slag amount is discharged through cooling from slag tap mouth 11 afterwards to a certain degree.Melting ash content in slag bath is to residual Burnt gasification, and combustion plays the role of catalysis and provides heat source, maintains the stability of burning, and improve charcoal percent conversion.
In combustion with meagre oxygen room 1, it is pyrolyzed rapidly under strong high-temperature slag heat effect by the coal dust that First air is sent into And burn, be formed as high-temp combustion gasification zone in gasification space lower part, keep excess air coefficient less than 1 in the area, about It is 0.7~0.8, maintaining reaction is combustion with meagre oxygen atmosphere, the fuel type NO of generationxIt is greatly decreased, converts nitrogen for most of nitrogen Gas.After the gasification reaction, since excess air coefficient is lower, coal dust is imperfect combustion, contains some CO, and about 10% is left It is right.Combustion with meagre oxygen room 1 is discharged in the flue gas uplink, the top exhanst gas outlet 13 through combustion with meagre oxygen room 1.Coal dust in combustion with meagre oxygen room 1 It burns under reproducibility atmosphere, is nearly free from NOx。
After the high-temperature flue gas of uplink is by one section of vertical flue, carried out by the convection heating surface 2 of the sparse arrangement in top cold But.Flue gas after cooling enters secondary combustion chamber 3, and layering herein is evenly arranged the pipeline of conveying high temperature air, high by first Warm air entrance 15, which is layered, is uniformly sent into appropriate high temperature air, is completely combined with flue gas, flue gas after cooling is in second-time burning It burns away in room 3.Excess air coefficient is approximately 0.9 less than 1 herein, and ignition temperature is lower than combustion with meagre oxygen room temperature, is generated Temperature mode NOxIt is less, it is effectively reduced NOxGeneration.And temperature is lower than the ash fusion point of most coals, will not cause each Heating surface surface contamination, and it is conducive to the design and arrangement of each heating surface.
Flue gas after being exchanged heat by the convection heating surface 4 of the horizontally disposed horizontal flue of upper boiler, downlink are passed through Air compartment 5 is mended, is layered by the second high temperature air entrance 16 to benefit air compartment 5 and is uniformly passed through appropriate high temperature air, guarantees to be catalyzed in CO 6 position excess air coefficient of oxidation unit is about 1~1.05, and temperature is lower, and about 500~600 DEG C.In CO catalytic oxidizing equipment CO in 6 in imperfect combustion flue gas is all aoxidized by CO catalyst.Then flue gas flows through economizer 7 and air preheater 8 Equal devices carry out heat exchange with it, and flue-gas temperature is discharged after being reduced to exhaust gas temperature from smoke outlet 9.
Boiler system of the invention is a kind of in the way of fractional combustion, efficient low NOxThe technology of discharge.It is de- without SCR Nitre device avoids SCR denitration and comes up against a series of problems in the process.And slag tap mode is used, there is retention efficiency height, it is right The wide adaptation range of coal, coal dust burn-off rate is high, the advantages such as flue gas cleaning degree height.
A kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation, including combustion with meagre oxygen room 1, CO catalysis oxidation Device 6 and boiler body other equipment；Combustion with meagre oxygen room 1 is the reproducibility gasification reaction atmosphere of insulation, using slag tap side Formula, excess air coefficient is less than 1 in combustion with meagre oxygen room 1, the coal dust of feeding combustion with meagre oxygen here, the flue gas warp after gasification, and combustion The exhanst gas outlet 13 of combustion with meagre oxygen room is discharged, and flows through boiler body other equipment；CO catalysis oxidation fills the attachment of the carrier in 6 CO and urges Agent is located at before boiler body economizer 7, and excess air coefficient is similar to 1 herein；Boiler body other equipment include setting It is placed in the convection heating surface 2 of the sparse arrangement in 1 top of combustion with meagre oxygen room, secondary combustion chamber 3, upper boiler convection heating surface 4, mends wind The equipment such as room 5, economizer 7, air preheater 8 and smoke outlet 9.Combustion with meagre oxygen room 1 is the reproducibility gasification reaction atmosphere of insulation, Including a wind inlet 10, melting slag bath 14, slag tap mouth 11, wall with refractory lining, refracto 12 and exhanst gas outlet 13；Combustion with meagre oxygen room 1 is interior Portion's cavity, cavity inside are laid with wall with refractory lining, refracto 12 and constitute adiabatic environment, and arrangement water-cooling wall constitutes furnace wall inside wall with refractory lining, refracto 12.Its underpart Side wall is equipped with a wind inlet 10, and 10 lower part of wind inlet is located in combustion with meagre oxygen room 1 and is equipped with melting slag bath 14, liquid slag The bottom in pond 14 is equipped with slag tap mouth 11, and cinder after cooling is discharged from slag tap mouth 11.1 inner top of combustion with meagre oxygen room is set There is exhanst gas outlet 13,13 one end of exhanst gas outlet connects combustion with meagre oxygen room 1, and the other end is through on vertical flue connection combustion with meagre oxygen room 1 The convection heating surface 2 of the sparse arrangement in portion.The central axis of wind inlet 10 and 1 internal cavities of combustion with meagre oxygen room is at a clamp Angle, First air inclination are sent into.Set on 1 lower sides of combustion with meagre oxygen room there are four for gasification zone formed whirlwind First air into Mouth 10 makes coal dust form cyclone firing mode.System uses slag tap mode, and the cinder that combustion process generates is thrown to through rotation 1 inner wall of combustion with meagre oxygen room then flows into bottom and melts slag bath 14, and the accumulation of slag amount is to a certain degree afterwards through cooling from slag tap Mouth 11 is discharged.Coal dust, water and high temperature air are through a wind inlet 10 tangentially into the cylindrical empty inside combustion with meagre oxygen room 1 Chamber, cavity are gasification space, and using cyclone firing mode, the lower part of gasification space is high-temp combustion gasification zone, in high-temp combustion Keep excess air coefficient less than 1 (about 0.7~0.8) in gasification zone, maintaining reaction is combustion with meagre oxygen atmosphere.What burning generated Cinder is thrown to 1 inner wall of combustion with meagre oxygen room under the action of swirling eddy, then flows into bottom and melts slag bath 14, the accumulation of slag amount It is discharged afterwards through cooling from slag-drip opening to a certain degree.Imperfect combustion high-temperature flue gas uplink, is discharged, by sparse through exhanst gas outlet The convection heating surface 2 of arrangement is cooling；In secondary combustion chamber 3, it is layered by the first high temperature air entrance 15 and is uniformly passed through appropriate high temperature Air burns away here through cooling flue gas, and excess air coefficient is about 0.9 herein, and ignition temperature is lower.Then flue gas It is exchanged heat by upper boiler convection heating surface 4, downlink is layered by the second high temperature air entrance 16 herein through overfill air compartment 5 It is uniformly passed through appropriate high temperature air, guarantees to be similar to 1 in 6 position excess air coefficient of CO catalytic oxidizing equipment, it is not complete here The CO in flue gas to burn entirely is all aoxidized.Then flue gas flows through the devices such as economizer 7 and air preheater 8, and temperature reduces It is discharged after to exhaust gas temperature from smoke outlet 9.CeO can be used in CO catalyst in CO catalytic oxidizing equipment 62Aeroge supports CuO and urges Agent.Due to Air Leakage Into Boilers and secondary combustion chamber, the presence for mending wind differentiation layer feeding air, in CO catalytic oxidizing equipment position mistake Amount air coefficient is similar to 1, and the CO in imperfect combustion flue gas is all aoxidized here.The boiler system is due to reproducibility High-temp combustion is without NO under atmospherexGeneration, there is no need to install SCR denitration device additional.Secondary combustion chamber 3 is located at pair of sparse arrangement After flowing heating surface 2, the pipeline of the high temperature air of layered arrangement conveying herein, air is layered uniform feeding from there, after cooling Flue gas burn away here.Air compartment is mended to be located at before CO catalytic oxidizing equipment, same layered arrangement conveying high temperature air Pipeline guarantees to be similar to 1 in CO catalytic oxidizing equipment position excess air coefficient, here the CO in imperfect combustion flue gas All aoxidized.
A kind of staged-combustion method of slag combustion with meagre oxygen catalysis oxidation is urged based on above-mentioned any slag combustion with meagre oxygen Change the fractional combustion boiler system of oxidation；The following steps are included:
Step A, coal dust, water and high temperature air enter the cavity of the inside of combustion with meagre oxygen room 1 through a wind inlet 10, use Cyclone firing mode forms high-temp combustion gasification zone in the lower part of cavity, excess air system is kept in high-temp combustion gasification zone For number less than 1, maintaining reaction is combustion with meagre oxygen atmosphere, excess air coefficient 0.7-0.8；
Step B, the cinder for generation of burning are thrown on the inner wall of combustion with meagre oxygen room 1, then under the action of swirling eddy It flows into bottom and melts slag bath 14, the accumulation of slag amount is discharged through cooling from slag-drip opening 11 afterwards to a certain degree, imperfect combustion high temperature Exhanst gas outlet 13 of passing through on flue gas discharge, cooling by the convection heating surface 2 of sparse arrangement, flue gas after cooling enters secondary combustion Burn room 3；
Step C is layered by the first high temperature air entrance 15 in secondary combustion chamber 3 and is uniformly passed through appropriate high temperature air, warp Cooling flue gas burns away in secondary combustion chamber 3, and excess air coefficient is about 0.9 in secondary combustion chamber 3；
Step D, after flue gas after second-time burning is exchanged heat by convection heating surface 4, into air compartment 5 is mended, mend air compartment 5 by Second high temperature air entrance 16, which is layered, is uniformly passed through appropriate high temperature air；
Step E, mixed gas enter CO catalytic oxidizing equipment 6, and excess air coefficient is equal to 1 in CO catalytic oxidizing equipment 6, CO in CO catalytic oxidizing equipment 6 in imperfect combustion flue gas is all aoxidized, and then flue gas flows through economizer 7 and air Preheater 8, temperature are discharged after being reduced to exhaust gas temperature from smoke outlet 9.

Claims (10)

1. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation characterized by comprising combustion with meagre oxygen room (1) and CO catalytic oxidizing equipment (6)；
Cavity is contained in the inside of combustion with meagre oxygen room (1), and the upper end of combustion with meagre oxygen room (1) is provided with exhanst gas outlet (13)；Oxygen deprivation combustion The lower sides for burning room (1) are equipped with several wind inlets (10)；The inside of a wind inlet (10) and combustion with meagre oxygen room (1) Cavity be connected；Excess air coefficient is less than 1 herein, the coal dust of feeding combustion with meagre oxygen here；
Exhanst gas outlet (13) arranged downstream of combustion with meagre oxygen room (1) has secondary combustion chamber (3)；Secondary combustion chamber (3) is provided with cigarette Gas entrance, exhanst gas outlet and several first high temperature air entrances (15), the smoke inlet of secondary combustion chamber (3) and combustion with meagre oxygen room (1) exhanst gas outlet (13) is connected；
The exhanst gas outlet arranged downstream of secondary combustion chamber (3) has benefit air compartment (5)；Air compartment (5) are provided with smoke inlet to benefit, flue gas goes out Mouth and several second high temperature air entrances (16), the smoke inlet for mending air compartment (5) are connected with the exhanst gas outlet of secondary combustion chamber (3) It is logical；
The exhanst gas outlet arranged downstream for mending air compartment (5) has CO catalytic oxidizing equipment (6), and excess air coefficient is 1~1.05 herein； CO catalytic oxidizing equipment (6) is provided with smoke inlet, exhanst gas outlet, the smoke inlet and benefit air compartment (5) of CO catalytic oxidizing equipment Exhanst gas outlet be connected.
2. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 1, feature exist In exhanst gas outlet (13) top of combustion with meagre oxygen room (1) is communicated with the first vertical flue；Cloth from bottom to up in first vertical flue It is equipped with convection heating surface (2) and secondary combustion chamber (3)；The outlet of first vertical flue is connected with horizontal flue, in horizontal flue It is disposed with convection heating surface (4)；The second down-set vertical flue of the outlet of horizontal flue, in the second vertical flue from Benefit air compartment (5), CO catalytic oxidizing equipment (6), economizer (7), air preheater (8) and smoke outlet have been sequentially arranged under (9)。
3. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 1, feature exist In the bottom of combustion with meagre oxygen room (1) is equipped with melting slag bath (14)；The lower end of melting slag bath (14) is provided with slag tap mouth (11)；The cavity inside of combustion with meagre oxygen room (1) is laid with wall with refractory lining, refracto (12) and constitutes adiabatic environment.
4. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 1, feature exist Cavity in, the inside of combustion with meagre oxygen room (1) is cylinder, and the quantity of a wind inlet (10) is four, each First air into On the side wall for the close lower end that mouthful (10) are all set in combustion with meagre oxygen room (1), four wind inlets (10) are and combustion with meagre oxygen The central axis of room (1) internal cavities forms an angle, and coal is made to form cyclone firing in combustion with meagre oxygen room (1).
5. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 1, feature exist In, several first high temperature air entrances (15) of secondary combustion chamber (3) layered arrangement up and down；Mend air compartment (5) several second are high Warm air entrance (16) layered arrangement up and down.
6. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 1, feature exist In the interior CO catalyst of CO catalytic oxidizing equipment (6) uses CeO2Aeroge supports CuO catalyst.
7. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 1, feature exist In holding excess air coefficient is less than 1 in secondary combustion chamber (3), but is greater than combustion with meagre oxygen room (1) interior excess air coefficient.
8. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 7, feature exist In keeping excess air coefficient in combustion with meagre oxygen room (1) is 0.7~0.8；Excess air system is kept in secondary combustion chamber (3) Number is 0.9.
9. a kind of fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation according to claim 1, feature exist In combustion with meagre oxygen room (1) is non-slag combustion chamber or fluidized bed combustion chamber.
10. a kind of staged-combustion method of slag combustion with meagre oxygen catalysis oxidation, which is characterized in that based in claim 1 to 9 The fractional combustion boiler system of slag combustion with meagre oxygen catalysis oxidation described in one；The following steps are included:
Step A, coal dust, water and air enter the cavity of the inside of combustion with meagre oxygen room through a wind inlet, using cyclone firing side Formula forms high-temp combustion gasification zone in the lower part of cavity, keeps excess air coefficient less than 1 in high-temp combustion gasification zone, dimension Holding reaction is combustion with meagre oxygen atmosphere；
Step B, the cinder for generation of burning are thrown on the inner wall of combustion with meagre oxygen room, then flow under the action of swirling eddy Bottom melts slag bath (14), and the accumulation of slag amount is discharged through cooling from slag-drip opening (11) afterwards to a certain degree；Imperfect combustion high temperature It passes through on flue gas exhanst gas outlet (13) discharge, cooling by the convection heating surface (2) of sparse arrangement, flue gas after cooling enters two Secondary combustion chamber；
Step C is uniformly passed through air by the layering of the first high temperature air entrance (15), through cooling cigarette in secondary combustion chamber (3) Gas burns away in secondary combustion chamber (3), and excess air coefficient is about 0.9 in secondary combustion chamber (3)；
Step D after the flue gas after second-time burning is exchanged heat by convection heating surface (4), into air compartment (5) are mended, is mended air compartment (5) Air is uniformly passed through by the layering of the second high temperature air entrance (16)；
Step E, mixed gas enter CO catalytic oxidizing equipment (6), in CO catalytic oxidizing equipment (6) excess air coefficient be 1~ 1.05, the CO in CO catalytic oxidizing equipment (6) in imperfect combustion flue gas is all aoxidized, and then flue gas flows through economizer (7) it is discharged after being reduced to exhaust gas temperature from smoke outlet (9) with air preheater (8), temperature.
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