CN104910986B - A kind of biomass double fluidized-bed vaporizing system gas plant and technique - Google Patents

A kind of biomass double fluidized-bed vaporizing system gas plant and technique Download PDF

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CN104910986B
CN104910986B CN201510346119.9A CN201510346119A CN104910986B CN 104910986 B CN104910986 B CN 104910986B CN 201510346119 A CN201510346119 A CN 201510346119A CN 104910986 B CN104910986 B CN 104910986B
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gas
charcoal
carrier
bed
biomass
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CN104910986A (en
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张守军
鲁万宝
赵成武
胡鹏
张守峰
李益瑞
吴银龙
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Hefei Deborah Power Co. Ltd.
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Hefei Debo Bioenergy Science & Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency
    • Y02P20/129Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Abstract

nullThe present invention provides this kind of biomass double fluidized-bed vaporizing system gas plant and technique,Including: combustion carrier heating unit、Pyrolytic gasification unit、Charcoal/carrier separates and supply unit、Methane synthesis and tar loopback cell,Shown pyrolytic gasification unit connects combustion carrier heating unit、Charcoal/carrier separates and supply unit、Methane synthesis and tar loopback cell,Invention obtains charcoal and realizes remaining composition simultaneously and transform into methane gas as far as possible,In thermal decomposition product, methane content is about 10%,Decrease the pressure of follow-up synthesis,Tar in pyrolysis gas is used as double-fluidized-bed fuel,Other double-fluidized-bed employing charcoal can be avoided to occur when burning, and low temperature cannot stably burn and under the condition of high temperature, alkali metal causes clogging problems,Furnace temperature is controlled the most flexible,The present invention takes full advantage of the different thermal decomposition products of biomass,Multiple biomass processes can be achieved,Raw material wide accommodation.

Description

A kind of biomass double fluidized-bed vaporizing system gas plant and technique
Technical field
The present invention relates to biogas technicalization field, a kind of biomass double fluidized-bed vaporizing system gas plant And technique.
Background technology
China has the agricultural-forestry biomass resource that reserves are huge, utilizes chemical effects analysis of biomass gasification for liquid fuel synthesis to substitute exhaustion day by day Fossil fuel has market prospect widely.Gasification of biomass is the transformation technology of a high-efficiency cleaning, by means of gasifying agent Effect make the conversion of biomass obtain combustion gas that principal combustible components is CO, H2, CO2 and CH4 or synthesis gas, gasification technology with Subsequent technique combination can be used for generating electricity, heat supply or synthesis of chemicals.Gasification of biomass can by bulky, energy density is low, no Easy firing or the low biomass material of efficiency of combustion be converted into that energy density is higher, is suitable to the natural gas that stores, transport and use Or other gas or liquid fuel, improve utilization of energy quality and utilization ratio, that has widened biomass energy utilizes scope simultaneously.
Gasification of biomass Poly-generation technology is dimerous by volatile matter and fixed carbon based on biomass combustible component Feature, uses decoupling reactive mode, and fixed carbon transforms into high-quality biological charcoal, and volatile matter transforms into combustion gas or synthesis gas, And then generate heat energy, electric energy or the chemicals including natural gas.Bamboo wooden class raw material obtains bamboo Linesless charcoal and deep processing becomes Activated carbon;Rice husk class raw material is used for steel mill's insulation material or carries out deep processing acquisition activated carbon and nano silicone after obtaining rice hull carbon Crystal;Stalk raw materials obtains straw charcoal and then makes high added value charcoal base composite fertilizer, after Different treatments, charcoal All can realize high value applications.
The present situation of China's natural gas resource growing tension and ambient pressure urgent needs utilize biomass at interior renewable energy The green natural gas of sustainable supply is developed in source, and economic benefit is good simultaneously, based on biomass double fluidized-bed biogas It is combined to natural gas technology adapt to this demand and obtain development.Biomass double fluidized-bed gasification furnace is by burning bed and gasifier bed two Two beds are coupled by part composition by high-temp solid heat carrier.Owing to being added without air in gasifier bed, it is to avoid big The amount nitrogen dilution to combustion gas, thus obtain high-quality synthesis gas, simultaneously co-producing bio charcoal.Owing to pyrolytic reaction is main anti- Should, in synthesis gas, methane content is up to more than 10%, follow-up synthesizing section.Owing to double-fluidized-bed gasification technology using Combustion furnace is by the way of heat carrier is to pyrolysis gasification furnace heat transfer, and the temperature of combustion furnace needs higher than pyrolysis gasification furnace, and current The burning of double fluidized bed combustion stove use charcoal (semicoke) as combustion furnace fuel, and charcoal ignition temperature is on 700 DEG C of left sides The right side, this just requires that the temperature of combustion furnace cannot be below 700 DEG C, and the ash of a lot of high alkalinity biomass material (straw, Caulis et Folium Oryzae etc.) Fusing point is also at about 700 DEG C, and when therefore using high alkalinity biomass material, traditional double-fluidized-bed mode cannot be run, Raw material can only be limited to the high ash melting point biomass such as wooden, rice husk, is therefore badly in need of the double-fluidized-bed skill that exploitation adaptability to raw material is wide Art, is allowed to can be widely applied to grain rice husk, timber processing offal, papermaking waste material and the refuse profit of various agricultural crop straw With and process, as saving the energy, protection environment, reducing production cost, the effective means increased the benefit.
Summary of the invention
Technical problem solved by the invention is to provide a kind of biomass double fluidized-bed vaporizing system gas plant and work Skill, to solve the problem in above-mentioned background technology.
Technical problem solved by the invention realizes by the following technical solutions: a kind of biomass double fluidized-bed vaporizing system Gas plant, including: combustion carrier heating unit, pyrolytic gasification unit, charcoal/carrier separates and supply unit, methane Synthesis and tar loopback cell, shown pyrolytic gasification unit connects combustion carrier heating unit, charcoal/carrier separates and conveying The synthesis of unit, methane and tar loopback cell, described combustion carrier heating unit includes fluid-bed combustion furnace, flue gas whirlwind, returns Glassware one, steam generator, air preheater and aerator, described pyrolytic gasification unit includes fluidized bed pyrolysis gasification furnace, combustion Cyclonic wind, biomass feeding device and material returning device two, described charcoal/carrier separates and supply unit includes charcoal cooling point From stove, charcoal whirlwind and carrier discharge pipe and carrier conveyer device, the synthesis of described methane and tar loopback cell include combustion gas Purification device and methane synthesis device and tar delivery pump.
Described fluidized bed combustion furnace upper end side connects flue gas whirlwind, and flue gas whirlwind lower end connects material returning device one, upper end even Being connected to steam generator, be provided with air preheater on the downside of steam generator, air preheater is connected to the end of fluid-bed combustion furnace Portion, material returning device one is connected to fluidized bed pyrolysis gasification furnace, and fluidized bed pyrolysis gasification furnace side is provided with biomass feeding device, stream Changing bed pyrolytic gasification furnace upper end side and be provided with gas cyclone, gas cyclone upper end is connected to gas-purification purifying plant, lower end even Being connected to material returning device two, material returning device two is connected to charcoal refrigerated separation stove, and charcoal refrigerated separation furnace upper end side is provided with biology Charcoal whirlwind, charcoal refrigerated separation stove lower end is provided with carrier discharge pipe, and carrier discharge pipe side is connected by carrier conveyer device In fluid-bed combustion furnace, described gas-purification purifying plant is connected to fluid-bed combustion furnace, carrier conveyer device by pipeline, combustion Connect on gas purification device and have methane synthesis device.
Described air preheater side is provided with aerator.
A kind of biomass double fluidized-bed vaporizing system natural gas process, comprises the following steps:
Step (1) adds biomass material by biomass feeding device in fluidized bed pyrolysis gasification furnace, and biomass are former Expect to issue the reaction of raw pyrolytic gasification at the high-temperature heat carrier heating state come by fluid-bed combustion furnace conveying, generate containing tar High-temperature hot is vented one's spleen and charcoal, and charcoal and heat carrier are pyrolyzed gas and are carried along into gas cyclone and realize gas solid separation, pyrolysis gas Enter gas-purification purifying plant, charcoal and heat carrier and enter charcoal refrigerated separation stove by material returning device two;
The step (2) high-temperature hot containing tar is vented one's spleen and is removed tar, moisture, dust and dioxy in gas-purification purifying plant Changing carbon, pyrolysis gas obtains synthesis gas after purifying, and synthesis gas is mainly composed of carbon monoxide, hydrogen, methane and macromolecule hydro carbons, closes Become gas to enter methane synthesis device and synthesize natural gas;
The tar that step (3) gas-purification purifying plant obtains is efficient in fluid-bed combustion furnace sent into by tar delivery pump Burning, the heat of generation is mainly used in heating heat carrier, and the high-temperature flue gas of generation carries high-temperature heat carrier and enters flue gas whirlwind, gas Gu flue gas is discharged after steam generator and air preheater after Fen Liing, high-temperature heat carrier enters fluid bed heat through material returning device one Solve gasification furnace;
The steam that step (4) steam vaporizer produces is sent to fluidized bed pyrolysis gasification furnace and as fluidizing agent and participates in gas Change reaction, air through air preheater laggard fluidized bed combustion furnace as tar combustion air the height that realizes heat carrier Speed fluidisation;
The carbon dioxide that step (5) gas-purification purifying plant obtains realizes charcoal in sending into charcoal refrigerated separation stove Cooling, utilize density contrast to realize the separation of heat carrier and charcoal, the charcoal after cooling is entrained into by carbon dioxide Enter charcoal whirlwind, after gas solid separation, obtain charcoal;
Step (6) heat carrier flows into carrier conveyer device through carrier discharge pipe, at the air conveying work of carbon dioxide With lower entrance fluid-bed combustion furnace.
The water content of described biomass material is 0-50%, biomass a size of 0-10cm.
Described fluid-bed combustion furnace in-furnace temperature is 600~1000 DEG C, fluidized bed pyrolysis gasification in-furnace temperature be 500~ 950 DEG C, charcoal refrigerated separation furnace temperature is 200~400 DEG C.
Described heat carrier is that abrasion resistant particles includes river sand, quartz sand, alumina balls, Ceramic Balls, and particle diameter is 0.2~2mm.
Compared with disclosed technology, there is advantages below in the present invention: the present invention obtains charcoal and realizes remaining composition simultaneously Transforming into methane gas as far as possible, in thermal decomposition product, methane content is about 10%, decreases the pressure of follow-up synthesis, will Tar in pyrolysis gas uses as double-fluidized-bed fuel after collecting, and other double-fluidized-bed employing charcoal can be avoided to burn Time occur low temperature cannot stably burn and under the condition of high temperature alkali metal cause clogging problems so that furnace temperature control the cleverest Living, the present invention takes full advantage of the different thermal decomposition products of biomass, can achieve multiple biomass processes, raw material subject range Extensively.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
In figure: 1, fluid-bed combustion furnace, 2, flue gas whirlwind, 3, material returning device one, 4, gas cyclone, 5, fluidized bed pyrolysis gasification Stove, 6, biomass feeding device, 7, gas-purification purifying plant, 8, methane synthesis device, 9, charcoal whirlwind, 10, charcoal Refrigerated separation stove, 11, tar delivery pump, 12, carrier discharge pipe, 13, carrier conveyer device, 14, material returning device two, 15, aerator, 16, air preheater, 17, steam generator.
Detailed description of the invention
It is prone to bright in order to make the technological means of the present invention, creation characteristic, workflow, using method reach purpose with effect White understanding, below in conjunction with the embodiment of the present invention, is clearly and completely described the technical scheme in the embodiment of the present invention, Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based in the present invention Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all Belong to the scope of protection of the invention.
As it is shown in figure 1, a kind of biomass double fluidized-bed vaporizing system gas plant, including: combustion carrier heating unit, heat Solve gasification unit, charcoal/carrier separates and supply unit, methane synthesis and tar loopback cell, shown pyrolytic gasification unit Connect combustion carrier heating unit, charcoal/carrier separates and supply unit, methane synthesis and tar loopback cell, described combustion Burn carrier heating unit and include fluid-bed combustion furnace 1, flue gas whirlwind 2, material returning device 1, steam generator 17, air preheater 16 With aerator 15, described pyrolytic gasification unit includes fluidized bed pyrolysis gasification furnace 5, gas cyclone 4, biomass feeding device 6 and Material returning device 2 14, described charcoal/carrier separates and supply unit includes charcoal refrigerated separation stove 10, charcoal whirlwind 9 and Carrier discharge pipe 12 and carrier conveyer device 13, the synthesis of described methane and tar loopback cell include gas-purification purifying plant 7 With methane synthesis device 8 and tar delivery pump 11.
Side, described fluid-bed combustion furnace 1 upper end connect flue gas whirlwind 2, flue gas whirlwind 2 lower end connect material returning device 1, on End is connected to steam generator 17, is provided with air preheater 16 on the downside of steam generator 17, and air preheater 16 is connected to fluidisation The bottom of bed combustion furnace 1, material returning device 1 is connected to fluidized bed pyrolysis gasification furnace 5, and fluidized bed pyrolysis gasification furnace 5 side is provided with Biomass feeding device 6, side, fluidized bed pyrolysis gasification furnace 5 upper end is provided with gas cyclone 4, and gas cyclone 4 upper end is connected to combustion Gas purification device 7, lower end are connected to material returning device 2 14, and material returning device 2 14 is connected to charcoal refrigerated separation stove 10, biological Side, charcoal refrigerated separation stove 10 upper end is provided with charcoal whirlwind 9, and charcoal refrigerated separation stove 10 lower end is provided with carrier discharge pipe 12, Carrier discharge pipe 12 side is connected to fluid-bed combustion furnace 1 by carrier conveyer device 13.
Described gas-purification purifying plant 7 is connected to fluid-bed combustion furnace 1, carrier conveyer device 13, combustion gas by pipeline Connect on purification device 7 and have methane synthesis device 8.
Described air preheater 16 side is provided with aerator 15.
A kind of biomass double fluidized-bed vaporizing system natural gas process, comprises the following steps:
Step (1) adds biomass material, biomass by biomass feeding device 6 in fluidized bed pyrolysis gasification furnace 5 Raw material issues the reaction of raw pyrolytic gasification at the high-temperature heat carrier heating state come by fluid-bed combustion furnace 1 conveying, generates containing one The high-temperature hot focusing oil content is vented one's spleen and charcoal, and charcoal and heat carrier are pyrolyzed gas and are carried along into gas cyclone 4 and realize gas Gu separate, pyrolysis gas enters gas-purification purifying plant 7, charcoal and heat carrier and enters charcoal cooling by material returning device 2 14 Chamber furnaced 10;
The step (2) high-temperature hot containing tar is vented one's spleen and is removed tar, moisture, dust and two in gas-purification purifying plant 7 Carbonoxide, pyrolysis gas obtains synthesis gas after purifying, and synthesis gas is mainly composed of carbon monoxide, hydrogen, methane and a small amount of macromolecule Hydro carbons, synthesis gas enters methane synthesis device 8 and synthesizes natural gas;
The tar that step (3) gas-purification purifying plant 7 obtains is in fluid-bed combustion furnace 1 sent into by tar delivery pump 11 Efficient burning, the heat of generation is mainly used in heating heat carrier, and the high-temperature flue gas of generation carries high-temperature heat carrier and enters flue gas rotation Wind 2, after gas solid separation, flue gas is discharged after steam generator 17 and air preheater 16, and high-temperature heat carrier is through material returning device 1 Enter fluidized bed pyrolysis gasification furnace 5;
The steam that step (4) steam vaporizer 17 produces is sent to fluidized bed pyrolysis gasification furnace 5 as fluidizing agent and joins With gasification reaction, air as tar combustion air and realizes heat through air preheater 16 laggard fluidized bed combustion furnace 1 The high velocity fluidization of carrier;
The carbon dioxide that step (5) gas-purification purifying plant 7 obtains realizes raw in sending into charcoal refrigerated separation stove 10 The cooling of thing charcoal, utilizes density contrast to realize the separation of heat carrier and charcoal, and the charcoal after cooling is taken by carbon dioxide Band enters charcoal whirlwind 9, obtains charcoal after gas solid separation.
Step (6) heat carrier flows into carrier conveyer device 13 through carrier discharge pipe 12, at the pneumatic transporting of carbon dioxide Send effect lower entrance fluid-bed combustion furnace 1.
The water content of described biomass material is not higher than 50%, and biomass size is not more than 10cm.
Described fluid-bed combustion furnace in-furnace temperature is 600~1000 DEG C, in fluidized bed pyrolysis gasification furnace 5 temperature be 500~ 950 DEG C, charcoal refrigerated separation stove 10 temperature is 200~400 DEG C.
Described heat carrier is abrasion resistant particles, and including river sand, quartz sand, alumina balls, Ceramic Balls, particle diameter is 0.2~2mm.
Embodiment 1
By moisture content 18%, particle diameter is that 5mm wood chip is added in fluidized bed pyrolysis gasification furnace 5 by feeding device 6, raw material Raw pyrolytic gasification is issued anti-at the 893 DEG C of high-temperature heat carrier 0.5mm quartz sand heating states come by fluid-bed combustion furnace 1 conveying Should, temperature 835 DEG C in fluidized bed pyrolysis gasification furnace 5, generate tar content 7% high-temperature hot vent one's spleen and charcoal, charcoal and Heat carrier is pyrolyzed gas and is carried along into gas cyclone 4 and realizes gas solid separation, and pyrolysis gas enters gas-purification purifying plant 7, biological Charcoal and heat carrier enter charcoal refrigerated separation stove 10 by material returning device 2 14, and charcoal refrigerated separation stove 10 temperature is 350 DEG C; High-temperature hot containing tar is vented one's spleen and is removed tar, moisture, dust and carbon dioxide in gas-purification purifying plant 7, and pyrolysis gas is clean Obtaining synthesis gas after change, synthesis gas enters methane synthesis device 8 and synthesizes natural gas, methane content 95%;Gas purification fills Putting tar efficient burning in fluid-bed combustion furnace 1 sent into by tar delivery pump 11 of 7 acquisitions, burn in-furnace temperature 950 DEG C, produces Raw heat is mainly used in heating heat carrier, and the high-temperature flue gas of generation carries high-temperature heat carrier and enters flue gas whirlwind 2, gas solid separation Rear flue gas is discharged after steam generator 17 and air preheater 16, and high-temperature heat carrier enters fluid bed heat through material returning device 1 Solve gasification furnace 5;The steam 450 DEG C that steam vaporizer 17 produces is sent to fluidized bed pyrolysis gasification furnace 5 as fluidizing agent and joins With gasification reaction, it is empty as tar burning that air is preheating to 433 DEG C of laggard fluidized bed combustion furnaces 1 through air preheater 16 Gas also realizes the high velocity fluidization of heat carrier;The carbon dioxide that gas-purification purifying plant 7 obtains sends into charcoal refrigerated separation stove Realize the cooling of charcoal in 10, utilize density contrast to realize the separation of heat carrier and charcoal, be cooled to the charcoal quilt of 75 DEG C Carbon dioxide is carried along into charcoal whirlwind 9, obtains charcoal, biomass carbon phosphorus content 81% after gas solid separation.
Embodiment 2
By moisture content 35%, particle diameter is that 2mm bamboo bits are added in fluidized bed pyrolysis gasification furnace 5 by feeding device 6, raw material Raw pyrolytic gasification is issued anti-at the 845 DEG C of high-temperature heat carrier 2mm Ceramic Balls heating states come by fluid-bed combustion furnace 1 conveying Should, temperature 775 DEG C in fluidized bed pyrolysis gasification furnace 5, generate tar content 5% high-temperature hot vent one's spleen and charcoal, charcoal and Heat carrier is pyrolyzed gas and is carried along into gas cyclone 4 and realizes gas solid separation, and pyrolysis gas enters gas-purification purifying plant 7, biological Charcoal and heat carrier enter charcoal refrigerated separation stove 10 by material returning device 2 14, and charcoal refrigerated separation stove 10 temperature is 310 DEG C; High-temperature hot containing tar is vented one's spleen and is removed tar, moisture, dust and carbon dioxide in gas-purification purifying plant 7, and pyrolysis gas is clean Obtaining synthesis gas after change, synthesis gas enters methane synthesis device 8 and synthesizes natural gas, methane content 95%;Gas purification fills Putting tar efficient burning in fluid-bed combustion furnace 1 sent into by tar delivery pump 11 of 7 acquisitions, burn in-furnace temperature 894 DEG C, produces Raw heat is mainly used in heating heat carrier, and the high-temperature flue gas of generation carries high-temperature heat carrier and enters flue gas whirlwind 2, gas solid separation Rear flue gas is discharged after steam generator 17 and air preheater 16, and high-temperature heat carrier enters fluid bed heat through material returning device 1 Solve gasification furnace 5;The steam 450 DEG C that steam vaporizer 17 produces is sent to fluidized bed pyrolysis gasification furnace 5 as fluidizing agent and joins With gasification reaction, it is empty as tar burning that air is preheating to 370 DEG C of laggard fluidized bed combustion furnaces 1 through air preheater 16 Gas also realizes the high velocity fluidization of heat carrier;The carbon dioxide that gas-purification purifying plant 7 obtains sends into charcoal refrigerated separation stove Realize the cooling of charcoal in 10, utilize density contrast to realize the separation of heat carrier and charcoal, be cooled to the charcoal quilt of 73 DEG C Carbon dioxide is carried along into charcoal whirlwind 9, obtains charcoal, biomass carbon phosphorus content 80.3% after gas solid separation.
Embodiment 3
By moisture content 42%, particle length is that 10mm straw is added in fluidized bed pyrolysis gasification furnace 5 by feeding device 6, former Expect that 591 DEG C of high-temperature heat carrier 1mm alumina balls heating states being come by fluid-bed combustion furnace 1 conveying issue raw pyrolytic gasification Reacting, temperature 540 DEG C in fluidized bed pyrolysis gasification furnace 5, the high-temperature hot generating tar content 6% is vented one's spleen and charcoal, charcoal Being pyrolyzed gas with heat carrier to be carried along into gas cyclone 4 and realize gas solid separation, pyrolysis gas enters gas-purification purifying plant 7, raw Thing charcoal and heat carrier enter charcoal refrigerated separation stove 10 by material returning device 2 14, and charcoal refrigerated separation stove 10 temperature is 240 ℃;High-temperature hot containing tar is vented one's spleen and is removed tar, moisture, dust and carbon dioxide, pyrolysis gas in gas-purification purifying plant 7 Obtaining synthesis gas after purification, synthesis gas enters methane synthesis device 8 and synthesizes natural gas, methane content 95%;Gas purification Tar efficient burning in fluid-bed combustion furnace 1 sent into by tar delivery pump 11 that device 7 obtains, burn in-furnace temperature 665 DEG C, The heat produced is mainly used in heating heat carrier, and the high-temperature flue gas of generation carries high-temperature heat carrier and enters flue gas whirlwind 2, and gas-solid divides Discharging after steam generator 17 and air preheater 16 from rear flue gas, high-temperature heat carrier enters fluid bed through material returning device 1 Pyrolysis gasification furnace 5;The steam 450 DEG C that steam vaporizer 17 produces is sent to fluidized bed pyrolysis gasification furnace 5 as fluidizing agent also Participating in gasification reaction, air is preheating to 310 DEG C of laggard fluidized bed combustion furnaces 1 through air preheater 16 and uses as tar burning Air also realizes the high velocity fluidization of heat carrier;The carbon dioxide that gas-purification purifying plant 7 obtains sends into charcoal refrigerated separation Realize the cooling of charcoal in stove 10, utilize density contrast to realize the separation of heat carrier and charcoal, be cooled to the charcoal of 68 DEG C It is carried along into charcoal whirlwind 9 by carbon dioxide, after gas solid separation, obtains charcoal, biomass carbon phosphorus content 45%.
The operation principle of the present invention is:
Biomass issue raw pyrolytic reaction at heating state, and its reaction equation is: biomass=CO2+CO+CH4+C2With Upper gas+H2+ charcoal+tar
The present invention obtains charcoal and realizes remaining composition simultaneously and transform into methane gas as far as possible, first in thermal decomposition product Alkane content, about 10%, decreases the pressure of follow-up synthesis, CO and H2As the unstripped gas of synthesizing methane, C2Above gas flow Seldom and the calorific value of natural gas, therefore CO, CH can be improved4、C2Above gas and H2It is available gas and can be used for follow-up conjunction Become.The calorific value of the tar in thermal decomposition product is the highest and is difficult to use as chemical products, therefore by this part when a small amount of generation Use as double-fluidized-bed fuel, other double-fluidized-bed employing charcoal can be avoided to occur that low temperature cannot stably fire when burning Burn and under the condition of high temperature alkali metal cause clogging problems so that furnace temperature control the most flexible.Titanium dioxide in pyrolysis gas Carbon is noble gas when temperature is less than 1000 DEG C, and the cooling for charcoal can realize temperature and reduces and avoid answering of charcoal Combustion.The present invention takes full advantage of the different thermal decomposition products of biomass, can achieve multiple biomass (including high bases) and process, former Material wide accommodation.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.The technology of the industry Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these become Change and improvement both falls within scope of the claimed invention.The claimed scope of the present invention by appending claims and Its equivalent defines.

Claims (7)

1. a biomass double fluidized-bed vaporizing system gas plant, it is characterised in that: including: combustion carrier heating unit, heat Solve gasification unit, charcoal/carrier separates and supply unit, methane synthesis and tar loopback cell, shown pyrolytic gasification unit Connect combustion carrier heating unit, charcoal/carrier separates and supply unit, methane synthesis and tar loopback cell, described combustion Burn carrier heating unit and include fluid-bed combustion furnace, flue gas whirlwind, material returning device one, steam generator, air preheater and air blast Machine, described pyrolytic gasification unit includes fluidized bed pyrolysis gasification furnace, gas cyclone, biomass feeding device and material returning device two, institute State charcoal/carrier separation and supply unit includes charcoal refrigerated separation stove, charcoal whirlwind and carrier discharge pipe and carrier Conveyer device, the synthesis of described methane and tar loopback cell include that gas-purification purifying plant and methane synthesis device and tar are defeated Send pump.
One the most according to claim 1 biomass double fluidized-bed vaporizing system gas plant, it is characterised in that: described stream Fluidized bed combustion furnace upper end side connects flue gas whirlwind, and flue gas whirlwind lower end connects material returning device one, upper end is connected to steam generator, Being provided with air preheater on the downside of steam generator, air preheater is connected to the bottom of fluid-bed combustion furnace, and material returning device one connects In fluidized bed pyrolysis gasification furnace, fluidized bed pyrolysis gasification furnace side is provided with biomass feeding device, fluidized bed pyrolysis gasification furnace Side, upper end is provided with gas cyclone, and gas cyclone upper end is connected to gas-purification purifying plant, lower end is connected to material returning device two, returns Glassware two is connected to charcoal refrigerated separation stove, and charcoal refrigerated separation furnace upper end side is provided with charcoal whirlwind, and charcoal is cold But chamber furnaced lower end is provided with carrier discharge pipe, and carrier discharge pipe side is connected to fluid-bed combustion furnace by carrier conveyer device, Described gas-purification purifying plant is connected to fluid-bed combustion furnace, carrier conveyer device, gas-purification purifying plant by pipeline Upper connection has methane synthesis device.
One the most according to claim 2 biomass double fluidized-bed vaporizing system gas plant, it is characterised in that: described sky Air preheater side is provided with aerator.
4. a biomass double fluidized-bed vaporizing system natural gas process, comprises the following steps:
Step (1) adds biomass material by biomass feeding device in fluidized bed pyrolysis gasification furnace, and biomass material exists The high-temperature heat carrier heating state come by fluid-bed combustion furnace conveying issues the reaction of raw pyrolytic gasification, generates the high temperature containing tar Pyrolysis gas and charcoal, charcoal and heat carrier are pyrolyzed gas and are carried along into gas cyclone and realize gas solid separation, and pyrolysis gas enters Gas-purification purifying plant, charcoal and heat carrier enter charcoal refrigerated separation stove by material returning device two;
The step (2) high-temperature hot containing tar is vented one's spleen and is removed tar, moisture, dust and titanium dioxide in gas-purification purifying plant Carbon, pyrolysis gas obtains synthesis gas after purifying, and synthesis gas is mainly composed of carbon monoxide, hydrogen, methane and macromolecule hydro carbons, synthesis Gas enters methane synthesis device and synthesizes natural gas;
The tar that step (3) gas-purification purifying plant obtains efficiently fires in fluid-bed combustion furnace sent into by tar delivery pump Burning, the heat of generation is mainly used in heating heat carrier, and the high-temperature flue gas of generation carries high-temperature heat carrier and enters flue gas whirlwind, gas-solid After separation, flue gas is discharged after steam generator and air preheater, and high-temperature heat carrier enters fluidized bed pyrolysis through material returning device one Gasification furnace;
The steam that step (4) steam vaporizer produces is sent to fluidized bed pyrolysis gasification furnace and as fluidizing agent and participates in gasified reverse Should, air through air preheater laggard fluidized bed combustion furnace as tar combustion air the high velocity stream that realizes heat carrier Change;
The carbon dioxide that step (5) gas-purification purifying plant obtains realizes the cold of charcoal in sending into charcoal refrigerated separation stove But, utilizing density contrast to realize the separation of heat carrier and charcoal, the charcoal after cooling is carried along into raw by carbon dioxide Thing charcoal whirlwind, obtains charcoal after gas solid separation;
Step (6) heat carrier flows into carrier conveyer device through carrier discharge pipe, under the air conveying effect of carbon dioxide Enter fluid-bed combustion furnace.
One the most according to claim 4 biomass double fluidized-bed vaporizing system natural gas process, it is characterised in that: described life The water content of raw material of substance is 0-50%, biomass a size of 0-10cm.
One the most according to claim 4 biomass double fluidized-bed vaporizing system natural gas process, it is characterised in that: described stream Fluidized bed combustion stove in-furnace temperature is 600~1000 DEG C, and fluidized bed pyrolysis gasification in-furnace temperature is 500~950 DEG C, and charcoal cools down Chamber furnaced temperature is 200~400 DEG C.
One the most according to claim 4 biomass double fluidized-bed vaporizing system natural gas process, it is characterised in that: described heat Carrier is that abrasion resistant particles includes river sand, quartz sand, alumina balls, Ceramic Balls, and particle diameter is 0.2~2mm.
CN201510346119.9A 2015-06-19 2015-06-19 A kind of biomass double fluidized-bed vaporizing system gas plant and technique Active CN104910986B (en)

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