CN208378799U - Gasification of biomass couples coal-burning boiler electricity generation system - Google Patents
Gasification of biomass couples coal-burning boiler electricity generation system Download PDFInfo
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- CN208378799U CN208378799U CN201820285692.2U CN201820285692U CN208378799U CN 208378799 U CN208378799 U CN 208378799U CN 201820285692 U CN201820285692 U CN 201820285692U CN 208378799 U CN208378799 U CN 208378799U
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The utility model provides a kind of gasification of biomass coupling coal-burning boiler electricity generation system, comprising: the regular rear storage of biomass material for that will collect, and the biomass storage supply unit sent out after cutting and crushing；For the biological particles gasification after cutting and crushing to be generated to the Biomass Gasification in Circulating Fluidized Bed unit of raw gas；The boiler feedwater come out for the high-temperature economizer using coal-burning boiler is used as cooling working medium, the biomass high-temperature combustion gas excess heat recovery unit that the raw gas is cooled down；For the raw gas after cooling to be sent into the raw gas metering blowing unit and mating fuel element of the coal-fired boiler combustion in measurable mode.The utility model uses gasification of biomass, waste heat recycling, the coupling of three processes of burning, realizes the indirect power generation of biomass, biomass is efficiently utilized while saving coal-fired, and reduce coal-fired boiler NOx discharge, application prospect is very wide.
Description
Technical field
The utility model relates to a kind of gasification of biomass to couple coal-burning boiler electricity generation system, belong to biomass processes technology neck
Domain.
Background technique
The biomass total amount that the whole world generates every year is only second to the fossil energy total amount consumed every year, and is renewable cleaning money
Source.Energy problem and environmental problem are two significant problems of global facing, with conventional energy resource coal, petroleum, natural gas
Etc. the exploitation depletion rates of fossil energies promoted, these energy are gradually consumed, the shadow of the consumption of traditional fossil energy to environment
Sound gradually shows, and EI Nino phenomenon frequently aggravates to influence, and polar glacier ablation, ecological environment is by unprecedented challenge.
Chinese Government promises to undertake the world, accounts for non-renewable energy consumption specific gravity to the year two thousand twenty non-fossil energy and is up to 15% or so, unit state
Interior total output value CO2 emission decline 40%~45% in than 2005, reaches CO2 emission peak value in the year two thousand thirty, arrives
The year two thousand thirty non-fossil energy accounts for non-renewable energy consumption specific gravity and is up to 20% or so, unit GDP CO2 emission
Decline 60%~65% in than 2005.Therefore, under such integrated environment, renewable resource is anticipated using with environmental protection
The promotion of knowledge is rapidly developed, and is the important channel for promoting energy supply diversification and cleaning development.
Biomass has resource abundance, the spy that Regional Distribution is wide and energy reserves are stable as renewable resource
Point.Both at home and abroad to biomass in the way of mainly using directly burning, pyrolysis etc., but since biomass energy metric density is opposite
It is lower, the features such as high-moisture, high volatile and high basic metal content, directly burns and be easy slagging, coking.And biomass pyrolytic mistake
The release of journey volatile matter is mainly come out in the form of tar, can carry out tar deep processing liquefaction product, but biomass pyrolytic residue
Calorific value still with higher, energy utilization are insufficient.Biomass was once being risen in the country and coal mixes burning power generation, but due to biomass
Slagging coking property causes coking operating condition in boiler part to occur, influences the power output and normal operation of coal-burning boiler.In addition, biological
First the gasify technology of after-combustion power generation of matter had obtained certain industrialization demonstration in recent years, and achieved greater advance, such as state
Electric Jingmen power plant handles biomass about 200t/d using biomass fluid bed gasification day, and synthesis gas is after cooling with drawing after gasification
Blower is sent into 600MW grade coal-burning boiler and fires realization power generation again, can reduce former coal-burning boiler coal consumption, biomass gasification fired power generation
Equivalent generated energy is about 10.8MW.But the project was built since 2008, is lasted 8 years or so and is not yet realized normal operation,
Mainly due to biomass material and coal, there are larger differences, and fluidized gasification process is complicated, and raw gas cooling procedure condition is harsh,
Technique controlling difficulty is larger, and tar precipitation etc. is influencing heat exchange equipment and blower just to gasification of biomass raw gas in cooling procedure
Often operating, system stability and reliability need to be further increased.Problem above is that problems of engineering design and process optimization are asked
Topic needs to carry out creative optimization design and is solved.
In conclusion gasification of biomass-combustion power generation technology has become the important development direction of biomass economy, but such as
What realizes that the coupled problem of gasification of biomass and combustion process is also to put in face of engineer application across a not past ridge.
Utility model content
The technical problems to be solved in the utility model is how to realize the coupling of gasification of biomass and combustion process.
In order to solve the above-mentioned technical problem, it is coal-fired to be to provide a kind of gasification of biomass coupling for the technical solution of the utility model
Boiler power generation system characterized by comprising
Biomass material for that will collect carries out regular rear storage, and the biomass material of storage is passed through cutting and crushing
The biomass storage supply unit sent out afterwards；
For the biological particles after cutting and crushing to be gasified by circle fluidized-bed gasification furnace, the biology of raw gas is generated
Matter recirculating fluidized bed gasification unit；
The boiler feedwater come out for the high-temperature economizer using coal-burning boiler is used as cooling working medium, and the raw gas is dropped
Temperature recycles the biomass high-temperature combustion gas excess heat recovery unit of the sensible heat of raw gas；
For the raw gas after cooling to be overcome on-way resistance and is sent into the coal-fired boiler combustion in measurable mode
Raw gas metering blowing unit and mating fuel element；
The biomass storage supply unit, Biomass Gasification in Circulating Fluidized Bed unit, biomass high-temperature combustion gas excess heat return
Unit, raw gas metering blowing unit and mating fuel element is received to be sequentially connected.
Preferably, the biomass storage supply unit includes biomass warehouse, and cutting breaking is set to biomass warehouse
Lower section, hopper are set to below cutting breaking, and the both ends of conveyor belt are separately connected hopper and raw material cabin, raw material cabin connection feed
Storehouse, feed hopper connect the Biomass Gasification in Circulating Fluidized Bed unit by frequency conversion screw(-type) feeder.
Preferably, the Biomass Gasification in Circulating Fluidized Bed unit includes circle fluidized-bed gasification furnace, the frequency conversion spiral
Batcher connect circle fluidized-bed gasification furnace feed inlet, pressure fan connect circle fluidized-bed gasification furnace bottom gasifying agent into
Mouthful, the top exit of circle fluidized-bed gasification furnace connects cyclone separator, and the outlet at bottom of cyclone separator is connected by feed back leg
Glassware is taken back, material returning device connects the feedback outlet of circle fluidized-bed gasification furnace；The top exit of cyclone separator connects the biology
Matter high-temperature fuel gas waste heat recovery unit.
Preferably, the biomass high-temperature combustion gas excess heat recovery unit includes the useless pot of high temperature, the top of the cyclone separator
The raw gas inlet pipeline of the useless pot of portion outlet connection high temperature, the raw gas outlet conduit of the useless pot of high temperature connect the raw gas metering
Blowing unit and mating fuel element；The water outlet of the water inlet pipe connection high-temperature economizer of the useless pot of high temperature, the useless pot of high temperature go out
The water inlet of water pipe connection high-temperature economizer.
Preferably, the raw gas metering blowing unit and mating fuel element include coal-burning boiler, and the high temperature saves
Coal device is set in the back-end ductwork of coal-burning boiler；The combustion gas of the raw gas outlet conduit connection coal-burning boiler of the useless pot of the high temperature is burnt
Mouth, the pipeline that the raw gas outlet conduit of the useless pot of high temperature is connect with fuel burner nozzle are equipped with raw gas flowmeter.
Preferably, the Biomass Gasification in Circulating Fluidized Bed unit is flowed in fluidized bed using bed material and biological particles
Change；
The bed material is the coal ash particle of 1mm~5mm partial size, the limestone particle of 5mm~8mm partial size, 1mm~3mm
The mixture of one or more of the river sand fine powder of diameter；
The biological particles are in rice husk, corncob, rice straw, straw, forestry waste or waste and old wood furniture
The shaped granule that is fabricated to of one or more or chopping after bulk cargo particle；When as shaped granule, grain density be 800~
1000kg/m3, grain diameter is 5mm~30mm according to spherical equivalent diameter range.
Preferably, the biomass that the circle fluidized-bed gasification furnace sends frequency conversion screw(-type) feeder is in set temperature condition
Gasify under the action of lower and gasifying agent, the raw gas entrained particulate after gasification goes out circle fluidized-bed gasification furnace, and in whirlwind point
From removing the biomass high-temperature combustion gas excess heat recovery unit after separating granular under the action of device；What cyclone separator separated
Particulate matter returns to circle fluidized-bed gasification furnace under the action of material returning device fluidized wind and regasifies by feed back leg and material returning device, gasifies
Lime-ash afterwards is discharged from the scum pipe of circle fluidized-bed gasification furnace bottom, and slag bath is removed after supercooling.
Preferably, the high temperature gives up pot using fire-tube type design, it may be assumed that rough coal makes tube side leave with rage, and shell side is walked in boiler feedwater；It is described
Tube side uses internal diameter for the pipeline of 40mm~80mm, and gas speed is 8~20m/s in pipeline.
Preferably, the boiler feed temperature of the high-temperature economizer water outlet be 280 DEG C~330 DEG C, pressure be 10~
30MPag, the boiler feedwater, which enters after the useless pot of high temperature, carries out heat exchange heating with the raw gas that cyclone separator is passed through, and boiler is given
Coolant-temperature gage returns the water inlet of high-temperature economizer again after being increased to 310 DEG C~360 DEG C, raw gas is cooled to 350 DEG C~500 DEG C.
Above-mentioned gasification of biomass coupling coal-burning boiler electricity generation system is in use, step are as follows:
Step 1: by the hot fume of circle fluidized-bed gasification furnace base burning fuel generation or quoted from the heat of coal-burning boiler
Flue gas carries out the baker heating of circle fluidized-bed gasification furnace, is warming up to and reaches biomass material feed temperature；
Step 2: by biomass material after cutting and crushing or forming processes, conveying into circle fluidized-bed gasification furnace；To
It is sent into gasifying agent in circle fluidized-bed gasification furnace, and controls the molar equivalent of biomass material feeding coal and gasifying agent than keeping permanent
It is fixed；
Step 3: realizing Biomass Gasification in Circulating Fluidized Bed, while circle fluidized-bed gasification furnace heats up, and passes through the stream of bed material
Change comes into full contact with biomass material with gasifying agent, and realizes sufficiently gasification in uniform situation of conducting heat；
Step 4: the raw gas generated after the gasification of circle fluidized-bed gasification furnace endogenous substance goes to give birth to after separating granular
Substance high-temperature fuel gas waste heat recovery unit, using the boiler feedwater conduct of the high-temperature economizer outlet in coal-burning boiler back-end ductwork
Cooling medium cools down to the raw gas；
Step 5: the raw gas after cooling is sent into coal-fired boiler combustion after metering, and heat is entirely delivered to coal-burning boiler
Water-cooling wall in working-medium water after generate water vapour and remove gas-to electricity, realize gasification of biomass, burning and power generation process.
Gasification of biomass coupling coal-burning boiler electricity generation system provided by the utility model uses gasification of biomass, waste heat returns
It receives, the coupling of three processes of burning, realizes the indirect power generation of biomass.Gasify conversion of biomass by recirculating fluidized bed as fuel
Gas is directly cooled down using coal-burning boiler high-temperature economizer outlet high-temperature high pressure water indirectly, final by the combustion gas after metering
It burns in coal-burning boiler, the coal-fired load of a part is substituted when not influencing coal-burning boiler system, while saving coal-fired
Biomass efficiently is utilized, and reduces coal-fired boiler NOx discharge to a certain extent.
Tthe utility model system stable and reliable operation is easy to enlargement amplification, environmental protection and energy saving, compared with prior art, this reality
It is also had the following beneficial effects: with novel
(1) the utility model is given up using gasification with high temperature, and pot couples, gasifying couples with burning, realizes double coupling process,
It is finally reached the purpose of biomass power generation, the biomass as renewable resource realizes cleaning, efficient utilization；
(2) the utility model can be incited somebody to action using coal-burning boiler high-temperature economizer outlet high-temperature water as combustible gas cooling cold source
Gas recovery sensible heat is indirectly for generating electricity while coal gas cools down, and the beneficial effect of high-temperature water is to be unlikely to generate larger temperature
Difference, can anti-fire-stopping pipe side low temperature fouling and slagging, achieved the purpose that achieve many things at one stroke；
(3) the utility model biomass realizes biomass indirect burning, overall process is not related to by gasification, recuperation of heat
The discharge of buck and flying dust not will cause the secondary pollution of water and dust, and the whole feature of environmental protection is higher, and system is compact to design, whole
Body investment is low, and construction and operation management are convenient；
(4) combustible gas in gasification of biomass coupling coal generating system described in the utility model is reducibility gas,
Local reduction atmosphere is formed into coal-fired boiler combustion process, and beneficial effect is played to the NOx emission for reducing coal-burning boiler, it can be
The discharge of totality NOx is reduced to a certain extent, and especially when boiler at low load is run, effect is become apparent.
Detailed description of the invention
Fig. 1 is that gasification of biomass provided in this embodiment couples coal-burning boiler electricity generation system schematic diagram；
Description of symbols:
1- biomass material；2- biomass warehouse；3- cutting breaking；4- hopper；5- conveyor belt；6- raw material cabin；7-
Feed hopper；8- frequency conversion screw(-type) feeder；9- circle fluidized-bed gasification furnace；10- Air Fluidized wind；The water inlet of 11- demineralized water；12- spiral shell
Revolve slag cooler；The water outlet of 13- demineralized water；14- slag bath；15- cyclone separator；16- material returning device；17- feed back leg；18- material returning device stream
Change wind；The water inlet pipe of the useless pot of 19- high temperature；The outlet pipe of the useless pot of 20- high temperature；21- high-temperature economizer；22- boiler feedwater；23- combustion
Gas burner；24- water-cooling wall；25- raw gas flowmeter；26- high temperature gives up pot；27- coal-burning boiler；28- flue gas；29- bottom ash；30-
Water vapour；31- pressure fan.
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.
Fig. 1 is that gasification of biomass provided in this embodiment couples coal-burning boiler electricity generation system schematic diagram, the biomass
Gasification coupling coal-burning boiler electricity generation system mainly include biomass storage supply unit, Biomass Gasification in Circulating Fluidized Bed unit,
Biomass high-temperature combustion gas excess heat recovery unit, raw gas measure the equipment such as blowing unit and mating fuel element.
As shown in Figure 1, biomass storage supply unit mainly include biomass warehouse 2, it is cutting breaking 3, hopper 4, defeated
Send belt 5, raw material cabin 6, feed hopper 7, frequency conversion screw(-type) feeder 8 and ducts instrument.Cutting breaking 3 is stored up set on biomass
2 lower section of storehouse, hopper 4 are set to 3 lower section of cutting breaking, and the both ends of conveyor belt 5 are separately connected hopper 4 and raw material cabin 6, raw material cabin
6, feed hopper 7, frequency conversion screw(-type) feeder 8 are sequentially connected.
Biomass material 1 in biomass warehouse 2 into hopper 4, then passes through conveying after cutting breaking 3 is broken
Belt 5 is delivered in raw material cabin 6, subsequently into feed hopper 7, is sent finally by frequency conversion screw(-type) feeder 8 to biomass circulating stream
Change bed gasification unit.The biomass material that biomass storage supply unit is used to collect carries out regular rear storage, and biomass is former
Material reaches certain partial size (being less than 20mm) by cutting and crushing, send biomass circulating fluidized bed gas by frequency conversion screw(-type) feeder
Change unit to gasify.
As shown in Figure 1, Biomass Gasification in Circulating Fluidized Bed unit mainly include circle fluidized-bed gasification furnace 9, pressure fan 31,
Cyclone separator 15, material returning device 16, feed back leg 17, screw cinder cooling device 12 and slag bath 14 etc..The frequency conversion screw(-type) feeder 8 connects
The feed inlet of circle fluidized-bed gasification furnace 9, pressure fan 31 connect the gasifying agent import of 9 bottom of circle fluidized-bed gasification furnace, circulation
The top exit of fluidized-bed gasification furnace 9 connects cyclone separator 15, and the outlet at bottom of cyclone separator 15 is connected by feed back leg 17
Glassware 16 is taken back, material returning device 16 connects the feedback outlet of circle fluidized-bed gasification furnace 9.The top exit of cyclone separator 15 connects life
Substance high-temperature fuel gas waste heat recovery unit.
The biomass that circle fluidized-bed gasification furnace 9 sends frequency conversion screw(-type) feeder 8 under the conditions of 700 DEG C or so temperature,
Gasify under the action of the Air Fluidized wind 10 that the pressure fan 31 of bottom is sent into, 0~100kPag of vapor pressure is thick after gasification
Coal gas carries a certain amount of particulate matter secretly and goes out circle fluidized-bed gasification furnace 9, and under the action of cyclone separator 15 after separating granular
Remove biomass high-temperature combustion gas excess heat recovery unit.The particulate matter that cyclone separator 15 separates passes through feed back leg 17 and material returning device
16, which return to circle fluidized-bed gasification furnace 9 under the action of material returning device fluidized wind 18, regasifies, and the lime-ash after gasification is from ciculation fluidized
The scum pipe of 9 bottom of bed gasification furnace is discharged, and removes slag bath 14 after the screw cinder cooling apparatus 12 of indirect type is cooling.
Screw cinder cooling apparatus 12 cools down lime-ash by demineralized water, in Fig. 1,11,13 respectively indicate demineralized water water inlet and
Demineralized water water outlet.
Biomass Gasification in Circulating Fluidized Bed is fluidized in fluidized bed using a certain amount of bed material and biological particles, bed material master
It is used to strengthen the Mass and heat transfer process in fluidized bed, which can be selected the coal ash particle or 5mm of partial size 1mm~5mm partial size
The river sand fine powder or three's mixture of~8mm partial size limestone particle or 1mm~3mm partial size.
Biological particles include the system such as rice husk, corncob, rice straw, straw, forestry waste and waste and old wood furniture
Bulk cargo particle after the shaped granule being made or chopping, when as shaped granule, 800~1000kg/m of grain density3, particle
Diameter is according to spherical equivalent diameter range 5mm~30mm, Average equivalent diameter preferred value 15mm~25mm.
Circle fluidized-bed gasification furnace 9, cyclone separator 15, feed back leg 17, material returning device 16 etc. are all made of fire resisting abrasionproof liner
Design of material can effectively avoid abrasion and etching problem.
Ciculation fluidized bed gasification process is using air or oxygen-enriched air or pure oxygen as gasifying agent.
As shown in Figure 1, biomass high-temperature combustion gas excess heat recovery unit mainly include high temperature give up pot 26, high-temperature economizer 21,
High temperature give up pot water inlet pipe 19, high temperature give up pot outlet pipe 20 and raw gas import and export pipeline etc..The top exit of cyclone separator 15
Connect the raw gas inlet pipeline of the useless pot 26 of high temperature, the raw gas outlet conduit connection raw gas metering air-supply list of the useless pot 26 of high temperature
First and mating fuel element.The water inlet pipe 19 of the useless pot 26 of high temperature connects the high-temperature economizer 21 in 27 back-end ductwork of coal-burning boiler
Water outlet, the give up outlet pipe 20 of pot 26 of high temperature connects the water inlet of the high-temperature economizer 21.
The high-temperature boiler water supply that the useless pot 26 of high temperature is come out using high-temperature economizer 21 is as cooling working medium, by cyclone separator
15 be passed through~700 DEG C of high temperature rough gas is reduced to 350 DEG C~500 DEG C, and recycles sensible heat of raw gas.Cooling
Raw gas afterwards enters raw gas metering blowing unit and mating fuel element.
The high-temperature boiler water supply typical temperature that high-temperature economizer 21 exports is 280 DEG C~330 DEG C, 10~30MPag of pressure,
Heat exchange heating is carried out after giving up pot 26 into high temperature with the raw gas of high temperature, temperature returns high temperature after being increased to 310 DEG C~360 DEG C again
The import of economizer 21, raw gas are cooled to 350 DEG C~500 DEG C.
High temperature gives up pot 26 using fire-tube type design, i.e. rough coal makes tube side leave with rage, and shell side is walked in boiler feedwater, and tube side is selected greatly
Shorten duct length as far as possible in the case of bore pipe 40mm~80mm, the guarantee higher 8~20m/s of flue gas flow rate of pipeline raw gas,
The fouling and slagging that can be effectively prevent in high temperature fire tube, high temperature gives up, and pot 26 is whole to can be used horizontal or upright type of design.
As shown in Figure 1, raw gas metering blowing unit and mating fuel element mainly include raw gas flowmeter 25, send
Blower 31, fuel burner nozzle 23, coal-burning boiler 27 etc..The combustion gas of the raw gas outlet conduit connection coal-burning boiler 27 of the useless pot 26 of high temperature
Burner 23, high temperature give up pot 26 the pipeline that is connect with fuel burner nozzle 23 of raw gas outlet conduit on raw gas flowmeter 25 is housed.
Raw gas metering blowing unit and mating fuel element are mainly used for the accurate measurement of the raw gas after gasification of biomass, and
On-way resistance is overcome to carry out raw gas feeding coal-burning boiler 27 to stablize burning.The useless pot 26 of high temperature exports raw gas and enters coal-fired pot
Furnace 27 burns, and the water heat absorption in water-cooling wall 24 is evaporated to water vapour 31, the deslagging of the bottom ash 29 of generation from 27 bottom of coal-burning boiler
Mouth discharge, the flue gas 28 of generation are discharged after 21 heating boiler feed water 22 of high-temperature economizer.
Specific step is as follows when above-mentioned gasification of biomass coupling coal-burning boiler electricity generation system uses:
The first step, by the hot fume of 9 base burning fuel of circle fluidized-bed gasification furnace generation or quoted from coal-burning boiler 27
Hot fume carry out the baker heating of circle fluidized-bed gasification furnace 9, be warming up to 400 DEG C~600 DEG C and reach biomass material and feed intake
Temperature；
Second step controls the biomass material that is stored in biomass warehouse 2 of the moisture less than 20% by sunning, by cutting
Cut broken or forming processes, control biological particles equivalent particle size, and raw material cabin 6 is delivered to by conveyor belt 5, enter back into
Feed bin 7 conveys into circle fluidized-bed gasification furnace 9 by frequency conversion screw(-type) feeder 8 and gasifies, and frequency conversion screw(-type) feeder 8 is realized
The molar equivalent of amount of oxygen is than keeping substantially constant in biomass feeding amount and air；
Third step, air is sent into 9 bottom air distribution plate of circle fluidized-bed gasification furnace by pressure fan 31 and blast cap realizes biomass
Recirculating fluidized bed gasification, while circle fluidized-bed gasification furnace 9 will heat up to 720 DEG C or so, make biomass by the fluidisation of bed material
Feed particles come into full contact with oxygen in air and are sufficiently gasified in uniform situation of conducting heat；
4th step, the raw gas generated after the gasification of 9 endogenous substance of circle fluidized-bed gasification furnace divide by cyclone separator 15
High temperature is gone to give up pot 26 from after, temperature is reduced to 350 DEG C~500 DEG C, using the high-temperature economizer 21 in 27 back-end ductwork of coal-burning boiler
The high-temperature boiler water supply of outlet is as cooling medium；
5th step, raw gas are sent into coal-burning boiler 27 by flowmeter, thermometer and after component analysis is sampled in line combustion gas
Fuel burner nozzle 23 burn, heat be entirely delivered in the water-cooling wall 24 of coal-burning boiler 27 after working-medium water generate water vapour 31 go to send out
Electricity utilizes, and realizes gasification of biomass, burning and power generation process.
There is no biomass fly ash emission in above procedure, all biomass ashs are respectively formed gasification bottom ash discharge recirculating fluidized bed
Gasification furnace 9, and make compound fertilizer's returning to the field or recycle to be processed into compound fertilizer, realize the abundant high-efficiency environment friendly combustion power generation mistake of biomass
Journey.
It is illustrated so that the gasification of biomass of a set of 20MW grade couples coal-burning boiler electricity generation system as an example below.Biomass
Using corn stover (50%) and rice husk, rice straw (50%).The design parameter of gasification reactor apparatus is as follows:
Biomass material characteristic is as follows:
Match fuel gas generated output: > 20MW；
It is aqueous to feed biomass: 20%；
Feed biological substance shaped granule average grain diameter: 15mm；
Recirculating fluidized bed gasification temperature: 720 DEG C；
High temperature gives up pot outlet gas temperature: 400~450 DEG C；
Gasifier operation pressure: 30kPag；
Sparking mode: fuel oil is lighted a fire under circle fluidized-bed gasification furnace bed；
Gasifying agent: normal temperature air.
Performance parameter index:
| Parameter | Atmospheric gasification | Positive pressure gasification |
| Normal running load range (rated load) | 60%~110% | 50%~120% |
| Biomass consumption, t/h | 16 | 15.8 |
| Gasification furnace gasification efficiency, % | ~72 | > 75 |
| The thermal efficiency, % | ~85 | > 90 |
| Factor of created gase, Nm3/kg | ~1.6 | > 2.3 |
| Wet low calorific gas value, kJ/Nm3 | ~5100 | ~5100 |
| Outlet gas dust burdening, g/Nm3 | ~15 | < 12 |
| Tar content, g/Nm3 | ~5 | ~4 |
| Outlet gas temperature, DEG C | ~700 | ~720 |
| Electricity volume (MW) | 20.8 | 22.3 |
| CO | 18.4 | 19.21 |
| H2 | 4.4 | 20.79 |
| CO2 | 15 | 14.21 |
| N2 | 51.9 | 36.60 |
| CH4 | 6.1 | 9.15 |
| H2S | - | 0.04 |
From above data, it can be concluded that, the present embodiment is using gasification of biomass coupling coal-burning boiler power generation design, in biology
The long-term high quality of safety and stability that gasification of biomass, pyrolysis and overall process of burning still are realized under the conditions of matter diversification of feedstock is set
Meter, wherein not being related to fly ash emission and sewage discharge, environment friendly is very high, compared with biomass direct combustion power generation, effectively keeps away
Exempting from biomass combustion leads to Boiler Furnace slagging risk, and the fluctuation of biomass combustion process will largely effect on coal-burning boiler globality
Energy；Compared with the biomass fluid bed gasification of simple subprogram combines heat-condutive oil heat exchanger scheme, the utility model design, which can reduce, is
The whole investment 5% of system, improves 5% or more the thermal efficiency, and especially under the premise of production same quality combustion gas, system simplifies, and no longer sets
Conduction oil storage and management function is counted, device of working medium is directlyed adopt and solves the problems, such as that combustion gas cools down, it is safe and efficient.
In conclusion gasification of biomass coupling coal-burning boiler electricity generation system provided by the utility model and method have obviously
Technological innovation advantage realize indirect biomass power generation after being matched with power plant suitable for the centralized processing of biomass, that is, make
It generates electricity for reproducible biomass resource, application prospect is very wide.
The above, the only preferred embodiment of the utility model, it is in any form and substantive not to the utility model
On limitation, it is noted that for those skilled in the art, in the premise for not departing from the utility model method
Under, several improvement and supplement can be also made, these are improved and supplement also should be regarded as the protection scope of the utility model.It is all ripe
Professional and technical personnel is known, in the case where not departing from the spirit and scope of the utility model, when using disclosed above
Technology contents and the equivalent variations of a little variation, modification and evolution made, be the equivalent embodiment of the utility model；Together
When, all substantial technologicals according to the utility model to the variation, modification and evolution of any equivalent variations made by above-described embodiment,
In the range of still falling within the technical solution of the utility model.
Claims (7)
1. a kind of gasification of biomass couples coal-burning boiler electricity generation system characterized by comprising
Biomass material for that will collect carries out regular rear storage, and the biomass material of storage is sent after cutting and crushing
Biomass storage supply unit out；
For the biological particles after cutting and crushing to be gasified by circle fluidized-bed gasification furnace, the biomass for generating raw gas is followed
Ring fluid bed gasification unit；
The boiler feedwater come out for the high-temperature economizer using coal-burning boiler is used as cooling working medium, and the raw gas is cooled down,
Recycle the biomass high-temperature combustion gas excess heat recovery unit of the sensible heat of raw gas；
For the raw gas after cooling to be overcome on-way resistance and is sent into the thick of the coal-fired boiler combustion in measurable mode
Gas measurement blowing unit and mating fuel element；
The biomass storage supply unit, Biomass Gasification in Circulating Fluidized Bed unit, the recycling of biomass high-temperature combustion gas excess heat are single
Member, raw gas metering blowing unit and mating fuel element are sequentially connected.
2. a kind of gasification of biomass as described in claim 1 couples coal-burning boiler electricity generation system, it is characterised in that: the biology
Matter Storing and conveying unit includes biomass warehouse (2), and cutting breaking (3) is set to below biomass warehouse (2), and hopper (4) is set
Below cutting breaking (3), the both ends of conveyor belt (5) are separately connected hopper (4) and raw material cabin (6), raw material cabin (6) connection
Feed hopper (7), feed hopper (7) connect the Biomass Gasification in Circulating Fluidized Bed unit by frequency conversion screw(-type) feeder (8).
3. a kind of gasification of biomass as claimed in claim 2 couples coal-burning boiler electricity generation system, it is characterised in that: the biology
Matter recirculating fluidized bed gasification unit includes circle fluidized-bed gasification furnace (9), and frequency conversion screw(-type) feeder (8) connection is ciculation fluidized
The feed inlet of bed gasification furnace (9), pressure fan (31) connect the gasifying agent import of circle fluidized-bed gasification furnace (9) bottom, recycle stream
The top exit for changing bed gasification furnace (9) connects cyclone separator (15), and the outlet at bottom of cyclone separator (15) passes through feed back leg
(17) material returning device (16) are connected, material returning device (16) connects the feedback outlet of circle fluidized-bed gasification furnace (9)；Cyclone separator (15)
Top exit connects the biomass high-temperature combustion gas excess heat recovery unit.
4. a kind of gasification of biomass as claimed in claim 3 couples coal-burning boiler electricity generation system, it is characterised in that: the biology
Matter high-temperature fuel gas waste heat recovery unit includes that high temperature gives up pot (26), and the top exit connection high temperature of the cyclone separator (15) is useless
The raw gas inlet pipeline of pot (26), the give up raw gas outlet conduit of pot (26) of high temperature connect the raw gas and measure blowing unit
And mating fuel element；High temperature give up pot (26) water inlet pipe (19) connection high-temperature economizer (21) water outlet, high temperature gives up pot
(26) water inlet of outlet pipe (20) connection high-temperature economizer (21).
5. a kind of gasification of biomass as claimed in claim 4 couples coal-burning boiler electricity generation system, it is characterised in that: the rough coal
Gas measures blowing unit and mating fuel element includes coal-burning boiler (27), and the high-temperature economizer (21) is set to coal-burning boiler
(27) in back-end ductwork；The high temperature give up pot (26) raw gas outlet conduit connection coal-burning boiler (27) fuel burner nozzle
(23), the pipeline that the raw gas outlet conduit of high temperature useless pot (26) is connect with fuel burner nozzle (23) is equipped with raw gas flowmeter
(25)。
6. a kind of gasification of biomass as claimed in claim 4 couples coal-burning boiler electricity generation system, it is characterised in that: the high temperature
Useless pot (26) are designed using fire-tube type, it may be assumed that rough coal makes tube side leave with rage, and shell side is walked in boiler feedwater.
7. a kind of gasification of biomass as claimed in claim 6 couples coal-burning boiler electricity generation system, it is characterised in that: the tube side
Use internal diameter for the pipeline of 40mm~80mm.
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