CN108916866A - A kind of telescopic multi fuel recycles-is bubbled combined fluidized bed boiler - Google Patents
A kind of telescopic multi fuel recycles-is bubbled combined fluidized bed boiler Download PDFInfo
- Publication number
- CN108916866A CN108916866A CN201810442475.4A CN201810442475A CN108916866A CN 108916866 A CN108916866 A CN 108916866A CN 201810442475 A CN201810442475 A CN 201810442475A CN 108916866 A CN108916866 A CN 108916866A
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- China
- Prior art keywords
- fluidized bed
- bed
- bubbling
- gasification
- biomass
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F23C10/005—Fluidised bed combustion apparatus comprising two or more beds
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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
- F23C10/18—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
- F23C10/22—Fuel feeders specially adapted for fluidised bed combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
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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
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
A kind of telescopic multi fuel recycles-is bubbled combined fluidized bed boiler, it is a kind of circulation is bubbled two kinds of bed bodies to be nested in integrated boiler.The fluidized bed of the fluidized-bed combustion boiler is divided into recirculating fluidized bed and bubbling fluidized bed, the burning of coal grain may be implemented, the process of gasification of biomass is carried out with time-division bed；Direct heat transfer between two, bubbling bed outside are laid with water-cooling wall, reach energy transmission, the effect of product isolation, while also saving the space occupied of product；Gasification of biomass, which generates fuel gas, oxynitrides will not be precipitated under conditions of gasification with Collection utilization, biomass.The present invention solves the problems such as waste heat when current circulating fluidized bed boiler uses single-fuel cannot make full use of, the discharge of oxynitrides is to the pollution of environment.
Description
Technical field
The present invention relates to fuel gasifications and field of combustion technology, and in particular to a kind of telescopic multi fuel circulation-bubbling connection
Collaborate fluidized bed boiler.
Background technique
Currently, industrialized gasification technology mainly has fixed bed gasification technology, fluidized gasification technology, entrained flow gasification
Technology.Wherein fixed bed gasification technology is most simple, also most widely used, but fixed bed is difficult to adapt to big fuel treatment
Amount, production scale are small；Raw material uses high-quality lump coal more, undoubtedly increases fuel cost；Gasification temperature is lower, is easy to bring phenol water
Etc. secondary pollution problems, environmental protection pressure is larger, is not able to satisfy national requirements for environmental protection；
Fluidized combustion technology was rapidly developed in recent years, can be with the high moisture content of lower heat of combustion because having combustion adaptive strong
The features such as high-ash fuel, high combustion efficiency, ignition temperature flexible adjustment, has only in fuel gasification and field of combustion technology
Special advantage.Bubbling fluidized bed boiler has fuel tolerance wide, can especially use inferior fuel, be typically used to biology
The fields such as matter gasification and burning.Circulating fluidized bed boiler is the novel furnace to grow up in bubbling fluidized bed boiler foundation, because
With low-temperature burning, good mixed effect and the features such as splendid fuel tolerance in bed, to there is wide society's effect
Benefit and application prospect.But fluidized-bed combustion boiler is also limited to single burning, mainly to use based on single-fuel, heat at present
Amount loss is bigger, and waste heat cannot make full use of after fuel combustion.
Summary of the invention
The present invention reduces fuel cost to increase fuel availability to the maximum extent, make full use of recirculating fluidized bed with
Heat caused by bubbling fluidized bed further decreases the discharge of oxynitrides, obtains the fuel gas such as hydrogen, realizes energy
Classified utilization, provide a kind of circulation-bubbling fluidization bed biomass-coal combined vaporizing-burning technical solution.
The technical scheme is that：A kind of telescopic multi fuel recycles-is bubbled combined fluidized bed boiler, and burner hearth is divided into
Two regions, intermediate region are that recirculating fluidized bed promotes tube portion, and peripheral regions are bubbling fluidized bed part.Wherein in recycle stream
Change in bed and carry out burning of coal, carries out the gasification of biomass in bubbling fluidized bed.Bubbling bed surrounding is disposed with water-cooling wall.
In recirculating fluidized bed, coal is fed from the feed inlet, and high-speed flow is injected in riser from bottom, coal and bed material quilt
Surrounding is dispelled, the entire space full of riser.Coal burns in riser, discharges heat.It is released after coal combustion
Heat is transmitted to bubbling fluidized bed by tube wall, the heat source as bubbling fluidized bed gasification.Combustion product passes through cyclone separator,
Flue gas is discharged from the exhanst gas outlet at the top of riser, and uncombusted carbon granules and bed material are then sent back in recirculating fluidized bed,
Re-start burning.
In bubbling fluidized bed, biomass is entered by feed inlet 2.Water-cooling wall, benefit are arranged in bubbling fluidized bed surrounding simultaneously
So that aqueous vapor is melted into high-temperature vapor with the waste heat of bubbling fluidized bed, the high-temperature vapor of generation by throttle valve come coutroi velocity,
It is passed into bubbling fluidized bed bottom, makes bed material and biomass fluidization, promotes heat transfer.Biomass is sent out with vapor in the high temperature environment
Raw gasification reaction generates imflammable gas, and the exhaust outlet at the top of bubbling fluidized bed carries out combustible gas collecting.
Independent fluidization system is respectively set in each fluidized bed, and wherein the fluidisation of recirculating fluidized bed is provided by air blower
Wind regime is entered bed by air distribution plate, as fluidizing agent；The fluidisation of bubbling fluidized bed is the high temperature generated by boiler water wall
Water vapour is sent into the bottom of bubbling fluidized bed, as fluidizing agent by throttle valve adjustment.In recirculating fluidized bed, whirlwind
Separator and entire Matter Transfer channel are arranged in the outside of entire boiler, extend by the top of recirculating fluidized bed riser
To the position on the lower side of recirculating fluidized bed side.In recirculating fluidized bed, it is equipped with feed inlet 1, for delivering coal.Outside bubbling fluidized bed
Side is equipped with feed inlet 2, for being passed through biomass.Bubbling fluidized bed is surrounded by water-cooling wall.Bubbling fluidized bed and recirculating fluidized bed
In state of isolation, the reaction that inner fuel occurs is not interfere with each other.
The present invention has the advantages that compared with prior art：The present invention by the way that fluidized bed is divided into two regions,
Realize coal combustion, the process of gasification of biomass is carried out with time-division bed.Meanwhile the heat of recirculating fluidized bed passing to orientation
Bubbling fluidized bed, the heat source as gasification of biomass.And the water that the waste heat of bubbling fluidized bed is also sufficiently water cooled wall is absorbed, gas
It is melted into high-temperature vapor.The flue gas generated that burns is flowed out from the top of recirculating fluidized bed, and gasification product is from the top of bubbling fluidized bed
Portion's outflow.The orientation transmitting for realizing matter and energy between each bed, makes heat caused by every single step reaction can be fully
It utilizes, reduces the discharge of oxynitrides,
And fuel gas can be collected.
Detailed description of the invention
Fig. 1 is the main view of fluidized bed in the embodiment of the present invention；
Wherein：1, coal feeding hole 2, biomass feed inlet 3, circulation fluidized bed air intake 4, bubbling bed high-temperature steam entrance 5, water cooling
Wall 6, cyclone separator 7, exhanst gas outlet 8, gasification product collection port 9, bubbling fluidized bed 10, recirculating fluidized bed；
Fig. 2 is the sectional view of fluidized bed in the embodiment of the present invention；
Fig. 3 is fluid bed three-dimensional schematic diagram in the embodiment of the present invention.
Specific embodiment
A kind of telescopic combined fluidized bed boiler of Two-way Cycle multi fuel, working principle are as follows：
1, recirculating fluidized bed：
Coal is entered in recirculating fluidized bed by feed inlet 1, and air is sent by air distribution plate from bottom by air blower, and coal and air are mixed
Combination burning releases a large amount of reaction heat, and the main chemical reactions occurred have：
Above-mentioned reaction is exothermic reaction, and reaction temperature is 800-950 DEG C, heat transfer caused by coal combustion to bubble flow
Change in bed, provides energy for the gasification of biomass（Heat source）.Under the effect of cyclone separator, generated flue gas is from promotion
The exhaust outlet at the top of pipe is discharged, and uncombusted carbon granules and bed material are then sent back in recirculating fluidized bed, re-start burning.
2, bubbling fluidized bed：
Water-cooling wall is arranged in bubbling fluidized bed surrounding, so that aqueous vapor is melted into high-temperature vapor using the waste heat of bubbling fluidized bed, is generated
High-temperature vapor by throttle valve come coutroi velocity, the nozzle of bubbling fluidized bed is then fed into, to reach the stream of particle
Change.
In bubbling fluidized bed, it is sent into a certain amount of biomass from feed inlet 2, high-temperature water vapor passes through as gasifying medium
Nozzle is sent in burner hearth from bottom, and the heat transfer that coal combustion discharges in recirculating fluidized bed is to bubbling fluidized bed, as life
The heat source of gasification substance.Water vapour reacts with the biomass under high temperature, it includes the pyrolysis of biomass, and water steams
Vapour-carbon reduction reaction, conversion reaction, methanation reaction of CO and water vapour etc..
（1）Biomass thermal decomposition reaction：The carbohydrate key of macromolecular is broken, and volatile matter is precipitated（It mainly include hydrogen
Gas, carbon monoxide, carbon dioxide, methane, tar and other carbohydrate）, leave carbon and constitute the matrix further reacted.It is raw
At 150 DEG C or more irreversible pyrolysis will occur for substance.
（2）Water vapour-carbon reduction reaction：
（3）The conversion reaction of CO and water vapour：
（4）Methanation reaction：
Above-mentioned reaction is substantially the endothermic reaction, and the fuel gas of generation passes through the exhaust outlet outflow at the top of bubbling fluidized bed, gas
Then body is collected.The temperature of bubbling fluidized bed is reduced to 200-350 DEG C after gasification.But in recirculating fluidized bed, burning of coal
Heat can be constantly generated, bubbling fluidized bed is then transferred heat to, maintains the temperature of bubbling fluidized bed more stable
State.
Overflow height in two beds can be adjusted by the air output of independent air-feeding system respectively.Bubbling fluidized bed with
Recirculating fluidized bed is in state of isolation, and the reaction that inner fuel occurs does not interfere with each other and only transmits heat.Gasification product with
Flue gas is also discharged from different exhaust outlets respectively, and the imflammable gas that reaction generates in fluidized bed can be collected.
Claims (5)
1. fluidized bed internal structure is divided into inside and outside two nested type regions, internal layer carries out coal combustion reaction, and outer layer carries out biomass
Gasification reaction.
2. material inlet is arranged on the outside of gasifier bed, wherein 1 is coal feeding hole, pass through in bubbling bed to circulation fluidized bed；It makes a living substance feeds
Mouthful, it is passed through in bubbling bed.
3. 6 lower end feed back pipe of cyclone separator returns in recirculating fluidized bed after extending through bubbling bed.
4. circulation fluidized bed surrounding uses the good steel of thermal conductivity；Bubbling bed surrounding is laid with water-cooling wall, absorbs waste heat, and the water of generation steams
Gas is passed through in bubbling bed as gasifying medium.
5. gasifier bed and bubbling bed use different adjustment valve regulation flow velocity respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810442475.4A CN108916866B (en) | 2018-05-10 | 2018-05-10 | Sleeve type multi-fuel circulating-bubbling combined fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810442475.4A CN108916866B (en) | 2018-05-10 | 2018-05-10 | Sleeve type multi-fuel circulating-bubbling combined fluidized bed boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108916866A true CN108916866A (en) | 2018-11-30 |
| CN108916866B CN108916866B (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810442475.4A Expired - Fee Related CN108916866B (en) | 2018-05-10 | 2018-05-10 | Sleeve type multi-fuel circulating-bubbling combined fluidized bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122335A (en) * | 2021-04-21 | 2021-07-16 | 新奥科技发展有限公司 | Biomass and coal co-gasification system and method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01247988A (en) * | 1988-03-26 | 1989-10-03 | Nippon Steel Corp | External circulation type fluidized-bed furnace |
| KR20110035951A (en) * | 2009-09-30 | 2011-04-06 | 뱁콕 앤드 윌콕스 파워 제네레이션 그룹, 인크. | Primary oxidant feed to oxy-fired circulating fluidized bed |
| CN102786990A (en) * | 2012-08-15 | 2012-11-21 | 太原理工大学 | Biomass and coal fluidized bed co-gasification method |
| CN103361087A (en) * | 2012-05-04 | 2013-10-23 | 张荣光 | Pyrolysis and combustion coupled circular reaction method and device |
| CN104154530A (en) * | 2014-08-21 | 2014-11-19 | 刘学冰 | Double-flow-state clean combustion boiler and double-flow-state clean combustion technology |
| CN105018154A (en) * | 2014-04-16 | 2015-11-04 | 代建军 | Biomass double fluidized bed indirect gasification system and control method thereof |
| CN206940810U (en) * | 2017-07-14 | 2018-01-30 | 光大环境科技（中国）有限公司 | A kind of self-heating low-tar biomass gasifier |
-
2018
- 2018-05-10 CN CN201810442475.4A patent/CN108916866B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01247988A (en) * | 1988-03-26 | 1989-10-03 | Nippon Steel Corp | External circulation type fluidized-bed furnace |
| KR20110035951A (en) * | 2009-09-30 | 2011-04-06 | 뱁콕 앤드 윌콕스 파워 제네레이션 그룹, 인크. | Primary oxidant feed to oxy-fired circulating fluidized bed |
| CN103361087A (en) * | 2012-05-04 | 2013-10-23 | 张荣光 | Pyrolysis and combustion coupled circular reaction method and device |
| CN102786990A (en) * | 2012-08-15 | 2012-11-21 | 太原理工大学 | Biomass and coal fluidized bed co-gasification method |
| CN105018154A (en) * | 2014-04-16 | 2015-11-04 | 代建军 | Biomass double fluidized bed indirect gasification system and control method thereof |
| CN104154530A (en) * | 2014-08-21 | 2014-11-19 | 刘学冰 | Double-flow-state clean combustion boiler and double-flow-state clean combustion technology |
| CN206940810U (en) * | 2017-07-14 | 2018-01-30 | 光大环境科技（中国）有限公司 | A kind of self-heating low-tar biomass gasifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122335A (en) * | 2021-04-21 | 2021-07-16 | 新奥科技发展有限公司 | Biomass and coal co-gasification system and method |
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| CN108916866B (en) | 2021-01-15 |
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Granted publication date: 20210115 |