CN109297015A - A kind of recirculating fluidized bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning device - Google Patents
A kind of recirculating fluidized bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning device Download PDFInfo
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- CN109297015A CN109297015A CN201811010972.3A CN201811010972A CN109297015A CN 109297015 A CN109297015 A CN 109297015A CN 201811010972 A CN201811010972 A CN 201811010972A CN 109297015 A CN109297015 A CN 109297015A
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- Prior art keywords
- burner hearth
- fluidized bed
- heat exchanger
- bubbling
- state burner
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Classifications
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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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
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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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel
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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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- 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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
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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
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
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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
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/06041—Staged supply of oxidant
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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
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/10006—Pressurized fluidized bed combustors
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- 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
Abstract
The invention discloses a kind of recirculating fluidized bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning devices, including recirculating fluidized bed/bubbling fluidized bed coupling burner hearth, air compartment, air distribution plate, cyclone separator, material returning device, external heat exchanger, pipe laying heating surface and curtain wall, wherein burner hearth to wind and is classified to coal using classification, emulsion zone arranges pipe laying heating surface, and dilute-phase zone outlet is connected to the cyclone separator；Solid material in cyclone separator separation hearth exiting flue gas, into material returning device and external heat exchanger.The device of the invention is suitable for pressurizeing, under high inlet oxygen concentration solid fuel burning, the advantages of having both bubbling fluidized bed and recirculating fluidized bed.The pipe laying heating surface that high capacity utilization is arranged by the bubbling fluidization area in lower furnace portion can effectively solve the problem that heating surface arrangement is limited, and effectively control furnace temperature and in-furnace temperature distribution to wind and classification returning charge to coal, classification by classification.
Description
Technical field
The present invention relates to a kind of recirculating fluidized bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning devices, and the present invention relates to follow
Circulation fluidized bed combustion technical field, in particular to Pressured Circulating Fluidized Bed oxygen-enriched combustion technology field.
Background technique
The burning of fossil fuel will necessarily be generated with CO2For the greenhouse gases of representative, the greenhouse gases largely discharged are right
Global climate, which causes, to be seriously affected.Thermal power station is the important industry for consuming fossil energy, and China's coal fired power plant installed capacity
Accounting in the industry of China power station is more than 70%.Therefore, there is an urgent need to find a kind of CO suitable for coal fired power plant in China2It catches
Collection technology.In existing coal fired power plant CO2In trapping technique, oxygen-enriched combusting (also known as O2/CO2Burning) technology is mature with it, can
Lean on, good economy performance the advantages that receive significant attention, coal-fired oxygen-enriched combustion technology divides fluidized bed oxygen-enriched combustion technology and coal-powder boiler rich
Two class of oxygen combustion technology.Oxygen-enriched combusting is to utilize air separation O obtained2Air and fuel are replaced with part circulating flue gas
Tissue burning, by greatly improving CO in smoke evacuation2Concentration realize CO2The technology of trapping.Simultaneously as oxygen-enriched combustion technology
Replace the nitrogen in air with circulating flue gas, therefore the NOx generated in fuel combustion process is all from fuel bound nitrogen, hardly
Heating power type and Quick-type NOx can be generated, the discharge of NOx can be reduced from source.
In recent years, deepening continuously with oxygen-enriched combustion technology research, has achieved the progress of many stages, burner hearth enters
Mouthful average oxygen concentration is developed to by the 25%-28% of the first generation more than 50%, but in terms of there is also problems and
Challenge.The raising of oxygen concentration reduces flue gas recycled amount, declines the energy consumption of circulating fan, but also circulating flue gas is caused to be taken out of
The heat of burner hearth is reduced, and furnace volume and sectional area reduce, and the difficulty of heating surface arrangement increases.In addition, first generation oxygen-enriched combusting
Technology is all made of normal pressure combustion system, burner hearth operating pressure and air-separating plant and CO2Purify the pressure between compression set
Variation can also consume big energy.Using pressurized oxy-fuel technology, the operating pressure of burner hearth is properly increased, portion is not only able to
Divide and reduce energy loss caused by due to above-mentioned pressure change, and pressurization improves the condensation temperature of vapor, and therefore can
The enough more efficient latent heat using vapor condensation release, to improve efficiency of plant.Therefore develop pressurized oxy-fuel technology at
For main trend.But using pressurized oxy-fuel technology furnace volume is further reduced, heating surface arrangement and fire box temperature
The problem of control, is more prominent, seriously constrains pressurized oxy-fuel technology, especially Pressured Circulating Fluidized Bed oxygen-enriched combusting skill
The popularization and commercial applications of art.
It is asked to solve the protrusion of Pressured Circulating Fluidized Bed oxygen-enriched combustion technology heating surface arrangement and fire box temperature control difficulty
Topic, the invention proposes a kind of recirculating fluidized bed of novelty/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, which is adopted
With fuel staging feeding technology, circulating ash classification returning charge technology and burner hearth staged air distribution technology, and by recirculating fluidized bed and drum
Fluidized bed organic coupling is steeped, the distribution of hearth combustion share and in-furnace temperature distribution can be efficiently controlled, such technology yet there are no report
Road.
Summary of the invention
For the limitation of existing technologies, the present invention proposes that a kind of Pressured Circulating Fluidized Bed/bubbling fluidized bed coupling pressurization is rich
Oxygen burner.The advantages of device combination bubbling fluidized bed, adds pipe laying heating surface in its underpart, effectively solution pressurization cycle
The problem of fluidized bed oxygen-enriched combusting heating surface difficult arrangement.Returning charge is classified to coal and circulating ash using staged air distribution, classification simultaneously
Technology with this control hearth combustion share distribution and fire box temperature distribution.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of recirculating fluidized bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, including supercharged furnace, the supercharged furnace point
State burner hearth, fast fluidization state burner hearth, the bubbling fluidization state burner hearth bottom are fluidized for sequentially connected bubbling fluidization state burner hearth, transition
Portion is provided with air distribution plate, and lower part is offered on air compartment for air port, is provided with pipe laying heating surface in bubbling fluidization state burner hearth, and at it
Coal supply mouth in lower part is offered on outer wall；Middle part coal supply mouth and middle part are offered for air port on the transition fluidisation state burner hearth；It is described
Fast fluidization state burner hearth offers top coal supply mouth and top for air port, fast fluidization on the part of transition fluidisation state burner hearth
Curtain wall is installed, the outlet of fast fluidization state burner hearth connects cyclone separator, the rotation through horizontal flue in state burner hearth
Wind separator upper outlet connects back-end ductwork through central tube, and lower outlet is connected to feeder pipe, and the feeder pipe shunting is provided with returning charge
Device and external heat exchanger, the pipeline that external heat exchanger connects feeder pipe is external heat exchanger feed pipe；The external
The heat exchanger first pipe of connection bubbling fluidization state burner hearth, the heat exchange of connection transition fluidisation state burner hearth are respectively arranged on heat exchanger
Device second pipe connects the heat exchanger third pipeline of fast fluidization state burner hearth, and connection heat exchange is respectively arranged on the material returning device
First returning charge pipeline of device first pipe connects the second returning charge pipeline of heat exchanger second pipe, connects heat exchanger third pipeline
Third returning charge pipeline.
Scheme as a further preference, the area of section of the bubbling fluidization state burner hearth be greater than transition fluidisation state burner hearth and
The area of section of fast fluidization state burner hearth.
Scheme as a further preference, the pipe laying heating surface are the cold water pipe laying of high capacity utilization.
Scheme as a further preference, the fuel of the supercharged furnace feed opening's edge height point three-level and are arranged in drum
Bubble fluidisation state burner hearth, transition fluidize state burner hearth, fast fluidization state burner hearth.Fuel after screening gained compared with coarse granule via burner hearth bottom
The feed opening in portion is sent into bubbling fluidization state burner hearth；The thinner fuel of screening gained is sent into furnace via the feed opening in the middle part of burner hearth and top
Thorax.
Scheme as a further preference, the material returning device and external heat exchanger divide three-level respectively to furnace along furnace height
Bubbling fluidization state burner hearth, transition fluidisation state burner hearth and the fast fluidization state burner hearth of thorax return to solid material.
Through the above technical solutions, would know that the beneficial effect of apparatus of the present invention is:
(1) this Pressured Circulating Fluidized Bed device is suitable for burning under high oxygen concentration, can reduce the body of boiler body and subsidiary engine
Product, to reduce boiler investment and operation cost.
(2) it is passed through at burner hearth different height by oxygen and circulating flue gas, realizes classification oxygen supply, cooperation fuel staging is given
Material technology, the distribution of Effective Regulation combustion share and fire box temperature distribution；Amount of circulating gas can be reduced as needed, reduce circulated air
Function consumption.
(3) present apparatus supplements the deficiency of furnace heating surface by external heat exchanger and adjusts fire box temperature, can pass through tune
Circulating ash quantity is saved, heat is brought into external heat exchanger and absorbs, is difficult to control for fire box temperature under the conditions of solving supercharged oxygen-enriched
The problem of.
(4) present apparatus supercharged furnace bubbling segment increases burner hearth heat-transfer surface using buried tube heat exchanger, increases burner
Heat exchange amount to control Pressured Circulating Fluidized Bed fire box temperature and Temperature Distribution, can effectively solve recirculating fluidized bed under pressurized environment
The problem that the arrangement of heating surface caused by size of burner hearth reduces is limited and the heat absorption of furnace internal heating surface is insufficient.
(5) present apparatus realizes the distribution that combustion share is controlled along furnace height by classification coal supply, classification returning charge and classification oxygen supply,
Make the burning that fuel is substantially stabilized.Reach the mesh of Temperature Distribution in control furnace temperature and burner hearth further combined with heating surface arrangement
's.
(6) fuel tolerance of the present apparatus is strong, is applicable to the increasing of the coal, biomass and other fossil fuels of various grades
Press fluidized bed oxygen-enriched combusting.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Wherein, 101- bubbling fluidization state burner hearth；102- transition fluidizes state burner hearth；103- fast fluidization state burner hearth；2- air compartment；3- cloth
Aerofoil；4- pipe laying heating surface；5- curtain wall；6- cyclone separator；7- feeder pipe；8- central tube；9- material returning device；Outside 10-
Set formula heat exchanger feed pipe；11- external heat exchanger internal heating surface；12- external heat exchanger；The lower part 13- is for air port；Under 14-
Portion's coal supply mouth；Coal supply mouth in the middle part of 15-；For air port in the middle part of 16-；The top 17- coal supply mouth；The top 18- is for air port.
Specific embodiment
It is clear to be more clear the object, technical solutions and advantages of the present invention, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.Illustrate that the simplified processing of attached drawing is only used as illustration herein.Group in attached drawing
Number of packages amount, shape and size can be increased and decreased and modify according to practical situations.Other aspects can also be carried out in the present invention
Practice or application, and without departing from spirit and scope defined in the present invention under conditions of, various change and adjustment can be carried out.
Inspiration of the invention and proposes one from the technical bug of existing pressurized oxy-fuel technology based on this
Kind Pressured Circulating Fluidized Bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning device.Apparatus of the present invention are applicable in inlet high pressure high oxygen
It burns under concentration, increases furnace internal heating surface arrangement while greatly reducing boiler body and subsidiary engine volume, can effectively solve and increased
Press rear furnace body reduce influence caused by heating surface arrange limitation problem, and by classification to coal, classification air feed, classification returning charge and
Heating surface Proper Match regulation furnace chamber inner combustion share and in-furnace temperature distribution are protected to improve the heat exchange amount inside supercharged furnace
Card is safely and steadily run.
A kind of recirculating fluidized bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, including supercharged furnace, supercharged furnace four
Week can be made of fin panel casing, and sequentially connected bubbling fluidization state burner hearth 101, transition fluidize state furnace from bottom to up in structure
Thorax 102, fast fluidization state burner hearth 103, wherein 101 cross-sectional area of bubbling fluidization state burner hearth is larger, implements bubbling fluidization state；Quickly
The smaller implementation fast fluidization state of 103 cross-sectional area of state burner hearth is fluidized, up-narrow and down-wide topology layout is shown.
101 bottom of bubbling fluidization state burner hearth is provided with air distribution plate 3, and lower part is offered on air compartment 2 for air port 13, bubbling fluidization
It is provided with pipe laying heating surface 4 in state burner hearth 102, and offers lower part coal supply mouth 14 on its external wall.
For burner hearth using being classified to wind and classification to coal, transition, which fluidizes, offers middle part coal supply mouth 15 on state burner hearth 102
Portion is for air port 16；The fast fluidization state burner hearth 103 offers top coal supply mouth on the part of transition fluidisation state burner hearth 102
17 and top for air port 18, curtain wall 5 is installed, fast fluidization state burner hearth 103 leads to outer in fast fluidization state burner hearth 103
Cyclone separator 6 is equipped at the nozzle in portion, 6 upper outlet of cyclone separator connects back-end ductwork through central tube, and lower outlet is connected to down
Expects pipe 7, the shunting of feeder pipe 7 are provided with material returning device 9 and external heat exchanger 12, and external heat exchanger 12 connects feeder pipe 7
Pipeline be external heat exchanger feed pipe 10；Connection bubbling fluidization state burner hearth is respectively arranged on the external heat exchanger 12
101 heat exchanger first pipe, the heat exchanger second pipe of connection transition fluidisation state burner hearth 102, connects fast fluidization state burner hearth
103 heat exchanger third pipeline is respectively arranged with the first returning charge pipeline of connection heat exchanger first pipe on the material returning device 9,
The second returning charge pipeline of heat exchanger second pipe is connected, the third returning charge pipeline of heat exchanger third pipeline is connected.
Bubbling fluidization area heat transfer coefficient is in 250W/m2℃-300W/m2It is ciculation fluidized much higher than other fluidizations between DEG C
Heat transfer coefficient (100W/m in pool furnace2℃-150W/m2DEG C), inside arrangement 3m-5m high water cooling pipe laying forms pipe laying heating surface 4, increases
Add burner hearth emulsion zone heating surface arrangement to increase burner hearth heat exchange amount.Top fast fluidized zone can arrange screen formula heat exchanger 5 to mend
Fill heating surface.
Supercharged furnace generates the flue gas containing recycle stock and enters cyclone separator 6 through supercharged furnace top exit, carries out gas
Gu separating treatment.Gained flue gas enters back-end surfaces via cyclone separator central upper portion cylinder 8 and exchanges heat after separation.Institute after separation
It obtains recycle stock and material returning device 9 or external heat exchanger 12 is entered by feeder pipe 7.
Material returning device 9 is the U-shaped structure with fin panel casing.Material returning device and external heat exchanger are divided equally three-level and are returned to burner hearth
Solid material, specifically, 9 side of material returning device divide three-level outlet to be connected with burner hearth, and higher level exports (third returning charge pipeline) connection
Heat exchanger third pipeline, to lead to supercharged furnace top (fast fluidization state burner hearth 103)；Middle rank outlet (the second returning charge pipeline) is even
Heat exchanger second pipe is connect, to lead to changeover portion (the transition fluidisation state in supercharged furnace bubbling fluidization area and fast fluidized zone
Burner hearth 102)；Junior exports (the first returning charge pipeline) and connects heat exchanger first pipe, to lead to supercharged furnace lower part (bubbling fluidization
State burner hearth 101).The regulation to thermal cycle ash returning charge process is realized by this structure, reaches the mesh of control in-furnace temperature distribution
's.
Another side outlet of feeder pipe 7 is connect through external heat exchanger feed pipe 10 with external heat exchanger 12, under
Needle-like valve regulation in expects pipe 7 enters the ash quantity in external heat exchanger 12.Further, 12 surrounding of external heat exchanger is by film
Formula water-cooling wall is constituted, and fluidized wind is flue gas recycled, and 750 DEG C -900 DEG C of inlet circulating ash temperature exports circulating ash temperature 300
℃-400℃.The heating surface 11 for being arranged in external heat exchanger is evaporator, superheater and reheater.Entire external heat exchanger
Both integrally-built heat-transfer surface had been increased, has increased heat exchange amount, combine main circulation loop send grey function.
External heat exchanger 12 arranges three-level outlet, and higher level exports (heat exchanger third pipeline) and connects supercharged furnace top
(fast fluidization state burner hearth 103)；Middle rank outlet (heat exchanger second pipe) link supercharged furnace bubbling fluidization area and quickly stream
The changeover portion (transition fluidizes state burner hearth 102) in the area Tai Hua；Junior exports (heat exchanger first pipe) link supercharged furnace lower part (drum
Bubble fluidisation state burner hearth 101)；Fuel after screening gained compared with coarse granule via burner hearth bottom feed opening be added burner hearth, sieve institute
It obtains thinner fuel and burner hearth is added via the feed opening of (transition region) and top (fast fluidized zone) in the middle part of burner hearth, pass through this knot
Structure realizes that SAPMAC method ash is classified returning charge, achievees the purpose that control in-furnace temperature distribution.
Supercharged oxygen-enriched circulating fluidized bed device divides three-level to coal and three-level air distribution respectively along supercharged furnace along short transverse.Point
Supercharged furnace is sent into for air port 13 by lower part for the First air of oxygen and flue gas recycled.In supercharged furnace bubbling fluidization area and
At the changeover portion of fast fluidized zone, Secondary Air is sent into for air port 16 by middle part.In fast fluidized zone by top for air port 18
It is sent into tertiary air (burnout degree).Three-level coal feeding hole matches respectively with three-level air distribution outlet, and fuel is after coarse fraction, lower part coal supply mouth 14
It is sent into compared with coarse grain diameter fuel, top coal supply mouth 17 is sent into compared with fine grain fuel.Staged air distribution and classification are to can be according to reality after coal
The combustion share in each region in burner hearth is adjusted flexibly in situation, arranges further combined with furnace internal heating surface and adjusts air distribution ratio, thus
Amount of circulating gas is reduced while controlling fire box temperature distribution, reduces circulating fan energy consumption.
Fuel is sent into supercharged furnace (bubbling fluidization state burner hearth 101, transition fluidisation state burner hearth through three-level coal feeding hole respectively
102, fast fluidization state burner hearth 103) it burns, the flue gas of generation realizes gas solid separation in cyclone separator 6.Gas passes through center
Cylinder 8 enters back-end ductwork, and the solid material separated enters material returning device 9 and external heat exchanger 12 through feeder pipe 7；Solids
Material sends supercharged furnace difference section back to through three-level returning charge pipeline.
The device of the invention be suitable for pressurize, under high inlet oxygen concentration solid fuel burning, have both bubbling fluidized bed
And the advantages of recirculating fluidized bed.The pipe laying heating surface of high capacity utilization, energy are arranged by the bubbling fluidization area in lower furnace portion
Effectively solve the problems, such as that pressurization and high inlet oxygen concentration conditions lower furnace body size substantially reduce and cause heating surface arrangement limited,
And furnace temperature and in-furnace temperature distribution are effectively controlled to wind and classification returning charge to coal, classification by classification, so that it is guaranteed that pressurization is oxygen-enriched
Efficient, the environmentally friendly and safe and stable operation of burner, and circulating fan energy consumption is effectively reduced by reducing amount of circulating gas, it mentions
Rise the economy of pressurized oxy-fuel system；It is changed by above-mentioned coal-supplying amount, air quantity at different levels and its oxygen concentration at different levels, into external
The ash quantity of hot device and material returning device, material returning device and external heat exchanger make along the comprehensive regulation of burner hearth different height three-level returning charge amount
Distribution and furnace heating surface Proper Match of the fuel along furnace height combustion share, it is real while amount of circulating gas is effectively reduced
Now efficient, the environmentally friendly and safe and stable operation of pressurization oxygen-enriched burning device.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (5)
1. a kind of recirculating fluidized bed/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, it is characterised in that: including supercharged furnace,
The supercharged furnace is divided into sequentially connected bubbling fluidization state burner hearth (101), transition fluidisation state burner hearth (102), fast fluidization state
Burner hearth (103), bubbling fluidization state burner hearth (101) bottom are provided with air distribution plate (3), and air compartment offers lower part air feed on (2)
Mouth (13), bubbling fluidization state burner hearth (101) is interior to be provided with pipe laying heating surface (4), and offers lower part coal supply mouth on its external wall
(14)；Middle part coal supply mouth (15) and middle part are offered on transition fluidisation state burner hearth (102) for air port (16)；The quick stream
Change state burner hearth (103) and offers top coal supply mouth (17) and top for air port on the part of transition fluidisation state burner hearth (102)
(18), it is equipped with curtain wall (5) in fast fluidization state burner hearth (103), the outlet of fast fluidization state burner hearth (103) is through level
Flue connects cyclone separator (6), and cyclone separator (6) upper outlet connects back-end ductwork through central tube (8), and lower outlet connects
Have feeder pipe (7), the feeder pipe (7) shunts and is provided with material returning device (9) and external heat exchanger (12), external heat exchanger
(12) pipeline for connecting feeder pipe (7) is external heat exchanger feed pipe (10)；It is set respectively on the external heat exchanger (12)
It is equipped with the heat exchanger first pipe of connection bubbling fluidization state burner hearth (101), the heat exchanger the of connection transition fluidisation state burner hearth (102)
Two pipelines connect the heat exchanger third pipeline of fast fluidization state burner hearth (103), are respectively arranged with connection on the material returning device (9)
First returning charge pipeline of heat exchanger first pipe connects the second returning charge pipeline of heat exchanger second pipe, connects heat exchanger third
The third returning charge pipeline of pipeline.
2. a kind of recirculating fluidized bed according to claim 1/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, feature
Be: the area of section of the bubbling fluidization state burner hearth (101) is greater than transition fluidisation state burner hearth (102) and fast fluidization state burner hearth
(103) area of section.
3. a kind of recirculating fluidized bed according to claim 1/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, feature
Be: the pipe laying heating surface (4) is the cold water pipe laying of high capacity utilization.
4. a kind of recirculating fluidized bed according to claim 1/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, feature
Be: the fuel of the supercharged furnace feeds opening's edge height point three-level and is arranged in bubbling fluidization state burner hearth 101, transition fluidisation
State burner hearth 102, fast fluidization state burner hearth 103；Fuel after screening be sent into compared with coarse granule via the feed opening of burner hearth bottom by gained
Bubbling fluidization state burner hearth 101；The thinner fuel of screening gained is sent into burner hearth via the feed opening in the middle part of burner hearth and top.
5. a kind of recirculating fluidized bed according to claim 1/bubbling fluidized bed coupling pressurization oxygen-enriched burning device, feature
Be: the material returning device 9 and external heat exchanger 12 are along furnace height point three-level respectively to the bubbling fluidization state burner hearth of burner hearth
101, transition fluidisation state burner hearth 102 and fast fluidization state burner hearth 103 return to solid material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811010972.3A CN109297015B (en) | 2018-08-31 | 2018-08-31 | Coupling pressurization oxygen-enriched combustion device of circulating fluidized bed/bubbling fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811010972.3A CN109297015B (en) | 2018-08-31 | 2018-08-31 | Coupling pressurization oxygen-enriched combustion device of circulating fluidized bed/bubbling fluidized bed |
Publications (2)
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| CN110260299A (en) * | 2019-05-29 | 2019-09-20 | 华中科技大学 | Supercritical carbon dioxide coal-burning boiler and its multi-stage flue gas method for recycling |
| CN111637452A (en) * | 2020-05-18 | 2020-09-08 | 东南大学 | Pressurizing oxygen-enriched combustion device and method for circulating fluidized bed |
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| CN109297015B (en) | 2019-12-17 |
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