CN106402911A - Double-circuit gasification and combustion system based on circulating fluidized bed and method and application thereof - Google Patents
Double-circuit gasification and combustion system based on circulating fluidized bed and method and application thereof Download PDFInfo
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- CN106402911A CN106402911A CN201610739140.XA CN201610739140A CN106402911A CN 106402911 A CN106402911 A CN 106402911A CN 201610739140 A CN201610739140 A CN 201610739140A CN 106402911 A CN106402911 A CN 106402911A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
- C10J3/56—Apparatus; Plants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/80—Other features with arrangements for preheating the blast or the water vapour
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/0916—Biomass
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0953—Gasifying agents
- C10J2300/0973—Water
- C10J2300/0976—Water as steam
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a double-circuit gasification and combustion system based on a circulating fluidized bed and a method and application thereof. The double-circuit gasification and combustion system comprises a gasifier, a primary separator, a heat exchanger, a secondary separator, a boiler and an ash bin, wherein the inlet of the primary separator communicates with the outlet of the gasifier; the gas outlet of the primary separator communicates with the heat medium inlet of the heat exchanger; the heat medium outlet of the heat exchanger communicates with the inlet of the secondary separator; gas subjected to primary separation is subjected to heat exchange for cooling in the heat exchanger; the gas outlet of the secondary separator communicates with the boiler; the solid outlet of the primary separator communicates with the inlet of a first material return valve; one side outlet of the first material return valve communicates with a first material return opening of the gasifier, and the other side outlet of the first material return valve communicates with the ash bin; the solid outlet of the secondary separator communicates with the inlet of a second material return valve; and one side outlet of the second material return valve communicates with a second material return opening of the gasifier, and the other side outlet of the second material return valve communicates with the ash bin.
Description
Technical field
The present invention relates to high-efficiency cleaning combustion field, particularly to a kind of double loop gasification, and combustion based on recirculating fluidized bed
System and method and application.
Background technology
Circle fluidized-bed gasification furnace, due to having the features such as adaptability to raw material is wide, be easy to through engineering approaches amplifies, develops in China
Rapidly, it is widely used in the thermochemical study recovery energy field of coal and biomass class solid waste.
In engineering, common biomass gasification combustion system technique is at present：Biomass material is in circle fluidized-bed gasification furnace
After interior gasification, and combustion, produced high-temperature fuel gas carry a large amount of granules and carry out gas solid separation through cyclone separator, and bulky grain is high
Warm ash is captured down and returns gasification hearth through standpipe and material returning device, and combustion gas carries fine grained flying dust at subsequent purification dedusting
Store for future use or be passed directly into the steam boiler burning main application model of two kinds of producing steam after reason.
Shorter yet with the time of staying in burner hearth for the feed particles, and gasification hearth temperature relatively low (generally below 900
DEG C) etc. reason, the unburned carbon in flue dust in gasification burning typically 20% about, for particle diameter difference is larger or raw material draft, wood
The biomass material that matter composition differs, part lime-ash is even as high as 30% with the phosphorus content in flying dust, and ash phosphorus content height is to lead
Cause the one of the main reasons that system effectiveness reduces.
For example, for Chinese medicine slag class industrial bio matter, produced by variety classes different formulations, medicinal residues raw material complexity is various,
And containing more wood fibre, material gasification before processing is also required to pulverization process, but the economy in view of engineering operation, enter
The material homogeneity entering gasification furnace can not show a candle to coal dust.Therefore, the biomass class material gasification system conditions of many material mixing
More complicated, easily reacting, uneven, gasify incomplete situation, causes system pressure unstable, and returning charge valve is blocked,
And then affect the stable operation of system.
And for being passed directly into the application model of boiler combustion, because the gas-solid disngaging efficiency of cyclone separator is limited, gas
Change and in burning, carry a considerable number of flying dust entrance boiler furnace, the dust that long-play produces will certainly produce to water-cooling wall
Raw contamination and corrosion, impact boiler heat exchange efficiency and safe operation.
Content of the invention
For technical problem present in above prior art, it is an object of the present invention to provide a kind of be based on recycle stream
Change the double loop gasification combustion system of bed.This gasification combustion system not only can substantially reduce the phosphorus content in ash, reduce into
Enter the flying dust amount of boiler, improve the efficiency of combustion of boiler, can also easily control material circulating load, and keep returning charge pipeline
Pressure balance, it is to avoid the system operation that the blocking at returning charge valve leads to is unstable, and realized fast by control material circulating load
The reaction operating mode of the throttled stove of velocity modulation, the dynamic regulation beneficial to system and stable operation.
Second object of the present invention is to provide a kind of stable operation side of the gasification combustion system based on recirculating fluidized bed
Method, the method can realize the stable operation of gasification furnace.
Third object of the present invention is the double loop gasification combustion system providing above-mentioned recirculating fluidized bed in biomass thing
Application in material gasification, the especially application in the gasification of multiple types biomass mixture material.
In order to solve above technical problem, the technical scheme is that：
A kind of double loop gasification combustion system based on recirculating fluidized bed, including gasification furnace, primary separator, heat exchanger,
Second-stage separator, boiler and ash silo, wherein,
The import of primary separator and the outlet of gasification furnace, the gas outlet of primary separator is situated between with the heat of heat exchanger
Matter inlet communication, the thermal medium outlet of heat exchanger and the inlet communication of second-stage separator, the gas after flash trapping stage is changing
Heat exchange cooling in hot device；The gas outlet of second-stage separator is connected with described boiler；
The solid outlet of primary separator and the inlet communication of the first returning charge valve, a side outlet of the first returning charge valve and gasification
First returning charge mouth connection of stove, another side outlet of the first returning charge valve is connected with ash silo；
The solid outlet of second-stage separator and the inlet communication of the second returning charge valve, a side outlet of the second returning charge valve and gasification
Second returning charge mouth connection of stove, another side outlet of the second returning charge valve is connected with ash silo.
Described gasification furnace, primary separator, heat exchanger, second-stage separator, boiler are equipped with several temperature and pressures and survey
Point.
One of purpose of heat exchanger is that air is heated, and will heat the hot-air obtaining, steam as gasifying medium
Supply circle fluidized-bed gasification furnace, controls gasification reaction temperature, adjusts reaction atmosphere；The two of the purpose of heat exchanger are to reduce
Gasification burning temperature, makes part gaseous state tar component be condensed into liquid, and adheres to tiny fly ash granule, make tiny fly ash granule
Form the particle of greater particle size, and then the efficiency of dust collection of raising secondary cyclone, obtain clean biometric matter combustion gas, and can subtract
The little flying dust amount entering steam boiler, it is ensured that the heat exchange efficiency of boiler, also can mitigate the Environmental-protecting dust-removing pressure before fume emission.
Preferably, described first returning charge valve and the second returning charge valve bottom are provided with air compartment, and described air compartment top is provided with air distribution plate,
Described air distribution plate is provided with the blast cap of some ventilations.
Preferably, in the confined space of described returning charge valve, the both sides of vertical ash tube mouth are respectively provided with baffle plate by returning charge valve
It is divided into three relatively independent chambers, the outlet of first chamber is connected to gasification furnace returning charge mouth, and the outlet of the 3rd chamber connects
In ash silo, described vertical ash tube is connected to the entrance of second chamber, and described baffle plate is connected to returning charge valve top board, and it is highly to return
The 1/2～2/3 of material valve spatial altitude.
Preferably, it is connected with the first feeding valve, the second returning charge valve and between described first returning charge valve and the first returning charge mouth
It is connected with the second feeding valve between two returning charge mouths.
It is further preferred that being connected with the 3rd feeding valve between described first returning charge valve and ash silo, the second returning charge valve and
It is connected with the 4th feeding valve between two returning charge mouths.
By adjusting ventilation and the conveying valve opening of returning charge valve air compartment, realize returning gasification furnace or enter ash silo material
The control of circulating load, and the pressure balance of returning charge pipeline can be kept, it is to avoid the system operation that the blocking at returning charge valve leads to is unstable
Fixed；Additionally, two-stage material-returning device is connected to gasification furnace and ash silo by different pipelines respectively, constitute two independent returning charge works
Make loop, be easy to operation and the controllability of system.
Preferably, described heat exchanger is air preheater, and the cold medium import of air preheater is connected with air source, cold Jie
Matter outlet is connected with described gasification furnace.
Cold air is heated by gasification gas, and the hot-air after heating is passed through in gasification furnace, controls gasification reaction temperature, regulation
Reaction atmosphere.
Preferably, described heat exchanger is steam generator, and the steam (vapor) outlet end of steam generator is connected with gasification furnace.Gasification
Water heating is obtained steam by the high-temperature fuel gas obtaining.
Preferably, described boiler is connected with ash silo.
Preferably, described boiler waste gas outlet is connected with chimney by dust arrester, the solid outlet of dust arrester and institute
State ash silo connection.
The species that described primary separator and second-stage separator can be selected for separator has cyclone separator, gravitational settling
Device, inertia separator；Preferably, described primary separator is the first cyclone separator, and second-stage separator is the second cyclonic separation
Device.
A kind of stable operation method of the gasification combustion system based on recirculating fluidized bed, comprises the steps：
Gasification furnace is gasified the combustion gas obtaining after first step gas solid separation, is lowered the temperature, the combustion gas after cooling is carried out
Second step gas solid separation, the combustion gas after being purified；Solid after first step gas solid separation and second step gas solid separation is through returning
Material valve carries out material distribution, and solid returns gasification furnace and ash silo according to allocation proportion.
Preferably, in the combustion gas after first step gas solid separation, the content of ash is 0.5～2g/m3.
Preferably, the temperature of the combustion gas after cooling is 200～300 DEG C.
Preferably, in the combustion gas after second step gas solid separation, the content of ash is 50～200mg/m3.
Application in gasifying biomass materials for the double loop gasification combustion system of above-mentioned recirculating fluidized bed, especially multiple
Application in the gasification of biolobic material mixed material.
Beneficial effects of the present invention are：
The double loop gasification combustion system of the present invention, is each worked independently returning charge using two-stage returning charge unit, system pressure
Can easily be accommodated control with solid circulating rate, there is preferable Solids Circulation Rates and efficiency of combustion, be easy to produce the biology of cleaning
Matter combustion gas, also can reduce the flying dust amount entering steam boiler it is ensured that the heat exchange efficiency of boiler, also can mitigate the ring before fume emission
Protect dedusting pressure, and then achieve high-efficiency cleaning conversion and the utilization of waste biomass materials.
It is connected with heat exchanger, heat exchanger not only can be to entrance gas between first separator of the present invention and the second separator
The air changed in stove is preheated, and improves the burning situation of gasification furnace, high-temperature fuel gas can also be lowered the temperature, by combustion gas
Part tar condensing condenses, and the fine solid particles in combustion gas is bonded as larger solid particle, improves the second separator
Removal effect to ash.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of returning charge valve of the present invention；
Fig. 3 is gasifier operation temperature variation curve；
Fig. 4 is system running pressure difference change curve, and gasifier operation pressure differential is gasification furnace bottom and gasification air compartment pressure
Power difference, the first returning charge valve pressure differential, the first returning charge valve pressure differential are respectively the pressure differential of the corresponding air compartment of described returning charge valve
Value.
Wherein, 1, charging aperture, 2, gasification furnace, 3, primary cyclone, 4, heat exchanger, 5, secondary cyclone, 6,
Boiler, 7, dust arrester, 8, blower fan, 9, chimney, 10, ash silo, 11, two grades of returning charge valves, 12, one-level returning charge valve, 13, feeding valve；
21-1, the first returning charge mouth, 21-2, the second returning charge mouth, 22, corundum steel fibre wear-resistant castable, 23, middle light thermal-insulation plastic
Concrete, 24, aluminium silicate get rid of silk rug, 25, baffle plate, 26, ash tube, 27, air compartment, 28, air distribution plate, 29, blast cap, 30, breast hole, 31,
Slag-draining device.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and detailed description.
As shown in figure 1, the double loop gasification combustion system based on recirculating fluidized bed of the present invention, including gasification furnace 2, one-level
Cyclone separator 3, heat-exchanger rig 4, secondary cyclone 5, boiler 6, blower fan 8, chimney 9, ash silo 10, one-level returning charge valve 12,
Two grades of returning charge valves 11 and four feeding valves 13, the gas outlet of gasification furnace 2 is connected with the gas feed of primary cyclone 3
Logical, primary cyclone 3 gas outlet connects with the thermal medium inlet of heat exchanger 4, the thermal medium outlet of heat exchanger 4 and two grades
The gas feed connection of cyclone separator 5, the gas outlet of secondary cyclone 5 is connected with boiler 6, and the waste gas of boiler 6 goes out
Mouthful connect with dust arrester 7, the solid outlet of boiler 6 connects with ash silo 10, the gas outlet of dust arrester 7 by blower fan 8 and
Chimney 9 connects, and the solid outlet of dust arrester 7 is connected with ash silo 10.
The solid outlet of primary cyclone 3 is connected with one-level returning charge valve 12, is provided with blower fan in one-level returning charge valve 12,
One side outlet of one-level returning charge valve 12 is connected with gasification furnace 2 by feeding valve 13, and another side outlet of one-level returning charge valve 12 passes through
Feeding valve 13 is connected with ash silo 10.
The solid outlet of secondary cyclone 3 is connected with two grades of returning charge valves 11, is provided with blower fan in two grades of returning charge valves 11,
One side outlet of two grades of returning charge valves 11 is connected with gasification furnace 2 by feeding valve 13, and another side outlet of two grades of returning charge valves 11 passes through
Feeding valve 13 is connected with ash silo 10.
Described first returning charge valve and the second returning charge valve bottom are provided with air compartment 27, and described air compartment 27 top is provided with air distribution plate 28,
Described air distribution plate 28 is provided with some blast caps 29 for ventilation.
In the inner space of described returning charge valve, the both sides of vertical 26 mouthfuls of ash tube are respectively provided with baffle plate 25 and divide returning charge valve
It is divided into three relatively independent chambers, the outlet (i.e. the first returning charge mouth 21-1) of first chamber is connected to gasification furnace returning charge mouth, the
The outlet (i.e. the second returning charge mouth 21-2) of three chambers is connected to ash silo 10, and described vertical ash tube 26 is connected to entering of second chamber
Mouthful, described baffle plate 25 is connected to returning charge valve top board, and it is highly the 1/2～2/3 of returning charge valve spatial altitude.
The blast cap 29 that wind in air compartment 27 passes through on air distribution plate 28 is blown in the inner space of returning charge valve, according to field condition
It is adjusted into the distribution of the wind within returning charge valve, realize the distribution of material.The bottom angled setting of described air compartment 27, bottom is
Lower is provided with breast hole 30, enters the lime-ash of air compartment 27 by air distribution plate 28 and blast cap 29, can be discharged by breast hole 2,
Run through described air distribution plate 28 upper and lower surface and be additionally provided with slag-draining device 31, the bottom of air compartment 27 is extended in the lower end of slag-draining device 31
Portion, slag-draining device 31 is provided with valve, opens valve and can discharge the lime-ash of accumulation in returning charge valve inner space.
Returning charge valve wall is followed successively by corundum steel fibre wear-resistant castable 22, the plastic concrete of middle light thermal-insulation 23 and silicon from inside to outside
Sour aluminum gets rid of silk rug 24, and wherein corundum steel fibre wear-resistant castable 22 acts primarily as high temperature resistant, wear-resistant effect, and middle light thermal-insulation can
Mould concrete 23 and act primarily as insulation effect, aluminium silicate gets rid of 24 thermal insulation functions of silk rug, the collective effect of three kinds of materials has preferably
Heat insulation effect, the radiation loss of system can be reduced, and mitigate the weight of returning charge valve.
Biological material after pulverizing puts into gasification furnace 2 from the charging aperture 1 of gasification furnace 2 and is gasified, and gasification obtains
High-temperature fuel gas carry out a gas solid separation in primary cyclone 3, with sky in the combustion gas entrance heat exchanger 4 after first class purification
Gas or water carry out heat exchange, obtain hot-air or steam, and combustion gas is cooled to 200～300 DEG C, heat the hot-air obtaining or steam
Deliver in gasification furnace；Combustion gas after cooling enters secondary cyclone 5 and carries out secondary gas solid separation, the combustion gas after purification
Enter in boiler 6 and burn, the ash obtaining in combustion process is collected in ash silo 10, and the waste gas of generation is through cleaner unit 7
After dedusting, discharged by chimney 9 in the presence of blower fan 8.In cleaner unit 7, the ash of accumulation enters in ash silo 10.
In primary cyclone 3, after one-level returning charge valve 12 distribution, most of ash returns gasification to the ash of accumulation
Stove 2, when gasifier operation fluctuation solid material carboloy residue that is larger or isolating is relatively low, can be the inventory returning gasification furnace
Adjust and reduce or even close down, by most ash delivery to ash silo 10；During adjusting one-level returning charge valve 12 distribution material, need
Coordinate the conveying valve opening in adjustment returning charge valve two ends exit to adjust the pressure of revert system management it is ensured that gasification furnace is given birth to
The stability of product process.
In secondary cyclone 5, after two grades of returning charge valves 11 distribute, a part of ash returns gasification to the ash of accumulation
Stove 2, is partly into ash silo 10 and stores, and adjust feeding valve 13 aperture regulation returning charge pressure it is ensured that gasification furnace produced
The stability of journey.
With certain Chinese medicine slag containing multiple biomass such as the Radix Astragali, Rhizoma Chuanxiong, Radix Paeoniae Rubra, Ramulus Cinnamomi, Ramulus Mori as raw material, using the present invention
System has carried out 48h long run test, and medicinal residues are first processed into before test the material of moisture content about 15wt.%, particle diameter ＜ 1cm, examination
Inlet amount is kept to be system design biomass inlet amount 2t/h during testing, gasifier operation temperature is become with system running pressure difference
Change curve respectively as shown in Figure 3, Figure 4.
As can be seen from Figure, from cold conditions furnace lifting to system, normal operation takes nearly 6h, subsequently can be with response system device
Irregular change in the parameters such as the gasifier temperature of main operating condition, air compartment and furnace pressure difference, but pass through system material
The control of circulating load and regulation, remain to keep system pressure and furnace body temperature to fluctuate in reasonably interval, when system of realizing is long
Between run continuous and stable.
Average remaining carbon in two-stage returning charge, system ash discharge can be controlled in less than 10%, enters the combustion of steam boiler
The flying dust amount of gas is 50～200mg/m3, the heat exchange efficiency of boiler is up to 85%～90%.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to invention protection domain
Restriction, one of ordinary skill in the art should be understood that, on the basis of technical scheme, those skilled in the art are not required to
The various modifications that creative work to be paid can be made or deformation are still within the scope of the present invention.
Claims (10)
1. a kind of double loop gasification combustion system based on recirculating fluidized bed it is characterised in that：Including gasification furnace, flash trapping stage
Device, heat exchanger, second-stage separator, boiler and ash silo, wherein,
The import of primary separator and the outlet of gasification furnace, the gas outlet of primary separator is entered with the thermal medium of heat exchanger
Mouth connection, the thermal medium outlet of heat exchanger and the inlet communication of second-stage separator, the gas after flash trapping stage is in heat exchanger
Middle heat exchange cooling；The gas outlet of second-stage separator is connected with described boiler；
The solid outlet of primary separator and the inlet communication of the first returning charge valve, a side outlet of the first returning charge valve and gasification furnace
First returning charge mouth connection, another side outlet of the first returning charge valve is connected with ash silo；
The solid outlet of second-stage separator and the inlet communication of the second returning charge valve, a side outlet of the second returning charge valve and gasification furnace
Second returning charge mouth connection, another side outlet of the second returning charge valve is connected with ash silo.
2. double loop according to claim 1 gasification combustion system it is characterised in that：Described first returning charge valve returns with first
It is connected with the first feeding valve between material mouth, between the second returning charge valve and the second returning charge mouth, be connected with the second feeding valve；
Preferably, be connected with the 3rd feeding valve between described first returning charge valve and ash silo, the second returning charge valve and the second returning charge mouth it
Between be connected with the 4th feeding valve.
3. double loop according to claim 1 gasification combustion system it is characterised in that：Described first returning charge valve and second returns
Material valve bottom be provided with multiple air compartments, the top of multiple air compartments is provided with air distribution plate, described air distribution plate be provided with some for ventilation
The wall of blast cap, air distribution plate and returning charge valve surrounds the inner space of returning charge valve；
Preferably, the both sides in the import of returning charge valve are respectively arranged with first baffle and second baffle, by returning charge valve inner space
It is divided into three chambers being interconnected, the outlet of first chamber is connected to gasification furnace returning charge mouth, and the outlet of the 3rd chamber connects
In ash silo, second chamber is provided with the import of described returning charge valve；
It is further preferred that described first baffle and second baffle are fixed on the top board of returning charge valve, first baffle and second gear
The height of plate is the 1/2～2/3 of returning charge valve internal height.
4. double loop according to claim 1 gasification combustion system it is characterised in that：Described heat exchanger is air preheat
Device, the cold medium import of air preheater is connected with air source, and cold medium outlet is connected with described gasification furnace.
5. double loop according to claim 1 gasification combustion system it is characterised in that：Described heat exchanger is steam generation
Device, the steam (vapor) outlet end of steam generator is connected with gasification furnace.Water heating is obtained steam by the high-temperature fuel gas obtaining that gasify.
6. double loop according to claim 1 gasification combustion system it is characterised in that：Described boiler waste gas outlet is by removing
Dirt device is connected with chimney, and the solid outlet of dust arrester is connected with described ash silo.
7. double loop according to claim 1 gasification combustion system it is characterised in that：Described first separator is the first rotation
Wind separator, the second separator is the second cyclone separator.
8. double loop according to claim 1 gasification combustion system it is characterised in that described gasification furnace, primary separator,
It is equipped with several temperature and pressure measuring points in heat exchanger, second-stage separator and boiler.
9. a kind of stable operation method of the gasification combustion system based on recirculating fluidized bed it is characterised in that：Comprise the steps：
Gasification furnace is gasified the combustion gas obtaining after first step gas solid separation, is lowered the temperature, the combustion gas after cooling carries out second
Step gas solid separation, the combustion gas after being purified；Solid after first step gas solid separation and second step gas solid separation is through returning charge valve
Carry out material distribution, solid returns gasification furnace and ash silo according to allocation proportion.
10. the arbitrary described double loop gasification combustion system based on recirculating fluidized bed of claim 1-8 is in gasifying biomass materials
In application, especially multiple types biomass mixture material gasification in application.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109237467A (en) * | 2018-10-10 | 2019-01-18 | 贵州新能源开发投资股份有限公司 | A kind of circulating fluidized bed boiler returning charge valve |
| CN114686269A (en) * | 2020-12-27 | 2022-07-01 | 新疆宜化化工有限公司 | Circulating fluidized bed coal gasifier for preventing furnace bottom coke slag and quartz sand from solidifying to form plate-shaped body |
| CN116379607A (en) * | 2023-06-05 | 2023-07-04 | 达州玖源新材料有限公司 | Heating equipment and drive control system for raw material processing production |
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| CN114686269A (en) * | 2020-12-27 | 2022-07-01 | 新疆宜化化工有限公司 | Circulating fluidized bed coal gasifier for preventing furnace bottom coke slag and quartz sand from solidifying to form plate-shaped body |
| CN116379607A (en) * | 2023-06-05 | 2023-07-04 | 达州玖源新材料有限公司 | Heating equipment and drive control system for raw material processing production |
| CN116379607B (en) * | 2023-06-05 | 2023-08-18 | 达州玖源新材料有限公司 | Heating equipment and drive control system for raw material processing production |
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