CN102977927A - Apparatus for preparing synthesis gas based on dual fluidized bed biomass gasification and preparation method thereof - Google Patents
Apparatus for preparing synthesis gas based on dual fluidized bed biomass gasification and preparation method thereof Download PDFInfo
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Abstract
The present invention discloses an apparatus for preparing synthesis gas based on dual fluidized bed biomass gasification, including a hopper, a dryer, a screw feeder, a pyrolysis fluidized bed, a reforming fluidized bed, a reforming cyclone separator, a calcination fluidized bed, a calcination cyclone separator, a first U-shaped refeeder, a second U-shaped refeeder and a third U-shaped refeeder. The method of the apparatus for preparing synthesis gas includes: feeding biomass into the hopper, feeding the dried biomass to the pyrolysis fluidized bed, pyrolyzing and gasifying, and feeding carbon residue into the calcination fluidized bed. In the calcination fluidized bed, the coke in solid residue is combusted with oxygen to decompose calcium carbonate. The products of gas phase and solid phase are separated by the calcination cyclone separator. The heat-carrying agent calcium oxide is fed into the reforming fluidized bed. The pyrolysis gas carries calcium oxide to increase to promote catalytic cracking of tar. The reformed gas is obtained by reforming the pyrolysis gas. The synthesis gas is obtained from a synthesis gas outlet. The apparatus for preparing synthesis gas can reduce the tar yield, and improve the synthesis gas heat value and gasification efficiency.
Description
Technical field
The present invention relates to device of a kind of producing synthesis gas and preparation method thereof, specifically, relate to and a kind ofly prepare device of synthetic gas and preparation method thereof based on double-fluidized-bed gasifying biomass.
Background technology
Current; the dual-pressure of facing mankind economic growth and environment protection; change the production and consumption mode of the energy; the renewable energy source that comprises biomass energy with the modern technologies development and use; to setting up the energy resource system of Sustainable development, promote socio-economic development and Improvement of Ecological Environment and the dependence tool of breaking away from fossil energy to be of great significance.
Biomass energy is one of mankind's important energy source of depending on for existence always, comprise energy forest, energy crop, waterplant, various organic waste etc., the Renewable Energy Resources that they are transformed by photosynthesis, it is organic storage of sun power, biomass energy is a kind of renewable energy source the most general on the earth, enormous amount is to be only second to coal, oil, Sweet natural gas and to be listed as the 4th the energy.According to estimates, the thermal equivalent of the annual water of the earth, terrestrial matter output is 3 * 10
21About J, be 10 times of the present total energy consumption in the whole world.China's biomass resource is quite abundant, and only be 3.08 hundred million tons of standard coals stock number every year of all kinds of agricultural wastes (such as stalk etc.), and the yule logs stock number is 1.3 hundred million tons of standard coals, adds ight soil, municipal wastes etc., and total resources can reach 6.5 hundred million tons of standard coals.
The at present utilization for biomass energy has various ways, comprise biomass fuel burning technology, biomass gasification technology, biomass pyrolytic technology, biomass Direct liquefaction technology, biofuel ethanol technology, biofuel technology of preparing, bio-hydrogen production technology, biogas technology etc., wherein gasifying biomass is a kind of important biomass energy conversion regime.Biomass have the characteristics such as the content of volatile content height, carbon activity height, sulphur, nitrogen and ash is low, are a kind of desirable gasified raw materials.
Gasifying biomass refers to biomass material after processing treatment, with vaporized chemical reaction gasification cracking, obtains inflammable gas in vapourizing furnace, as required the further purifying treatment of output gas is obtained required gas product.Its principle is under the effect of gasifying medium, biomass generation pyrolysis, oxidation, reduction, reforming reaction, with the generation of tar, tar further thermo-cracking or catalytic pyrolysis becomes the small molecules hydrocarbon polymer, thereby obtains the inflammable gass such as hydrogen, carbon monoxide, methane in the pyrolytic process.
The domestic biomass gasifying furnace that adopts is generally fixed-bed gasification furnace or fluidized-bed gasification furnace at present.But wherein fixed-bed gasification furnace is used less, because it has throughput little, tar yield is large, the low shortcomings that waits of gasification efficiency, and fluidized-bed gasification furnace becomes the first-selected type of furnace of gasifying biomass, but because its gasification efficiency is high, the wide heavy industrialization of adaptability to raw material uses and the synthetic gas tar content is relatively low.
The biomass gasification device Main Problems that puts into operation has complex structure, and running cost is high, and gasification efficiency is low, and biomass undergoes adaptation is poor, but maximum problem is that still tar yield is large, and secondary pollution is serious.In order to make coke tar cracking, conventional way is to adopt two-step approach, be exactly that biomass are vented one's spleen through fluidized-bed gasification furnace gasification Heat of Formation first, and then make gas product be converted into synthetic gas by catalytic reforming and coke tar cracking, pyrolysis and reformation are what to carry out in the reactor of two series connection.
Chinese invention patent 201120001962.0 discloses a kind of two-part circulating fluidized bed biomass gasification system, biomass gasify in fluidized-bed gasification furnace first, utilize cyclone dust collector that gas is separated with biomass char, biomass char is sent into cyclone combustion chamber and is carried out the secondary pyrolysis, vapourizing furnace is sent in the combustion gas of secondary pyrolysis back to, supplementing energy.These patent characteristics are the abundant pyrolysis of fixed carbon that make in the biomass char, utilize simultaneously its heat circulation to supply with vapourizing furnace.Its shortcoming is pyrolysis gas and just can carry out follow-up secondary pyrolytic reaction after tar need to separate, and the required temperature of pyrolysis is high, although utilized fixed carbon heat in the biomass char, heat dissipation is large generally.
Summary of the invention
Technical problem: technical problem to be solved by this invention is: provide a kind of and prepare device of synthetic gas and preparation method thereof based on double-fluidized-bed gasifying biomass, utilize this device preparation synthetic gas, can reduce the output of tar, improve the calorific value of gasifying biomass efficient and synthetic gas.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of device for preparing synthetic gas based on double-fluidized-bed gasifying biomass, it is characterized in that, this device comprises hopper, moisture eliminator, screw feeder, pyrolysis fluidized-bed, reformation fluidized-bed, reformation cyclonic separator, calcining fluidized-bed, calcining cyclonic separator, the first U-shaped material returning device, the second U-shaped material returning device and the 3rd U-shaped material returning device
The bottom of described pyrolysis fluidized-bed is provided with steam entry, and the bottom of calcining fluidized-bed is provided with oxygen intake, and the top of reformation cyclonic separator is provided with syngas outlet, and the top of calcining cyclonic separator is provided with exhanst gas outlet; The bottom of the first U-shaped material returning device is provided with the first returning charge nitrogen inlet, and the bottom of the second U-shaped material returning device is provided with the second returning charge nitrogen inlet, and the bottom of the 3rd U-shaped material returning device is provided with the 3rd returning charge nitrogen inlet;
The discharge port of described hopper links to each other with the opening for feed of moisture eliminator, the discharge port of moisture eliminator links to each other with the feed end of screw feeder, the discharge end of screw feeder is positioned at the inner chamber top of pyrolysis fluidized-bed, the bottom of pyrolysis fluidized-bed is connected by the bottom of the second U-shaped material returning device with the calcining fluidized-bed, the top of calcining fluidized-bed is connected with the top of calcining cyclonic separator, the bottom of calcining cyclonic separator is connected with the bottom of reformation fluidized-bed by the 3rd U-shaped material returning device, the top of reformation fluidized-bed is connected with the top of reformation cyclonic separator, and the bottom of reformation cyclonic separator is connected with the bottom of pyrolysis fluidized-bed by the first U-shaped material returning device.
A kind of method of utilizing the device for preparing synthetic gas based on double-fluidized-bed gasifying biomass to prepare synthetic gas, described method comprises following process:
In hopper, drop into biomass material, biomass material is sent into carried out drying in the moisture eliminator, make the water content of dried biomass material in 5%;
Dried biomass material is sent into by screw feeder in the pyrolysis fluidized-bed that is preinstalled with Wingdale, and simultaneously, the steam entry bottom the pyrolysis fluidized-bed passes into water vapour; When the pyrolysis fluidized-bed is heated to 750-850 ℃, biomass material gasifies in the pyrolysis fluidized bed for pyrolysis, Heat of Formation is vented one's spleen and solid residue, comprise the products such as carbon monoxide, hydrogen, carbonic acid gas, methane and tar in the pyrolysis gas, solid residue comprises coke, pyrolysis gas rises in the reformation fluidized-bed, the heated reformate fluidized-bed, make the temperature of reformation fluidized-bed remain on 900 ℃, solid residue is deposited on the bottom of pyrolysis fluidized-bed, and solid residue and Wingdale enter in the calcining fluidized-bed through the second material returning device;
The heating and calcining fluidized-bed, make the temperature in the calcining fluidized-bed remain on 950 ℃, pass into oxygen, the coke in the solid residue and oxygen combustion to the oxygen intake of calcining fluidized-bed, emit a large amount of heats, making the Decomposition of Calcium Carbonate in the Wingdale is solid particulate calcium oxide and atmospheric carbon dioxide; At the top of calcining fluidized-bed, calcium carbonate is decomposed into calcium oxide and carbonic acid gas fully, forms gas-solid two-phase product; This gas-solid two-phase product is after the calcining cyclonic separator separates, and flue gas is discharged from the exhanst gas outlet of calcining cyclonic separator, and calcium oxide turns back to the bottom of reformation fluidized-bed through the 3rd U-shaped material returning device;
In the reformation fluidized-bed, pyrolysis gas carries calcium oxide and rises, calcium oxide absorbs the carbonic acid gas in the pyrolysis gas, form calcium carbonate, promote water gas shift reaction and methane reforming reaction, simultaneously, calcium oxide is as the catalyzer of coke tar cracking, catalytic cracking of tar generates hydrogen and CO (carbon monoxide converter) gas, pyrolysis gas obtains reformed gas after reforming in the reformation fluidized-bed, reformed gas is after reformation cyclonic separator gas solid separation, and the isolated calcium carbonate of reformation cyclonic separator sends back in the pyrolysis fluidized-bed through the first U-shaped material returning device, realizing the thermophore recycle, is synthetic gas from the syngas outlet Exhaust Gas of reformation cyclonic separator.
Beneficial effect: compared with prior art, the present invention has following advantage:
(1) output of minimizing tar, the calorific value of raising synthetic gas improves gasifying biomass efficient.In apparatus of the present invention, in the reformation fluidized-bed, tar is by thermophore particulate oxidation calcium catalytic pyrolysis, decomposite the inflammable gass such as hydrogen and carbon monoxide, tar yield reduces, and the inflammable gass such as hydrogen increase so that flow rate improves, and whole gasification efficiency improves.
(2) realized the cyclic regeneration of thermophore catalyzer.Take the Wingdale thermophore as example, in the calcining fluidized-bed, the heat of coke burning is so that the Wingdale main composition-calcium carbonate at high temperature is decomposed into CaO and CO
2, CaO carries heat and enters in the reformate stream fluidized bed reactor, for reforming reaction provides heat.In this process, CaO absorbs the CO in the pyrolysis gas
2, promote water gas shift reaction CO+H
2O=H
2+ CO
2And methane reforming reaction, catalytic pyrolysis occurs rapidly as the tar that catalyzer produces pyrolysis in CaO simultaneously, generates H
2With the micro-molecular gas such as CO, the tar content in the pyrolysis gas is reduced, the output of synthetic gas improves greatly.CaO is absorbing CO
2After regenerate CaCO
3, turn back in the fluidized-bed gasification furnace, realized the recycle of thermophore catalyzer.
(3) realized the staged conversion of biomass energy.In the present invention, the gasification in the pyrolysis fluidized-bed of biomass material elder generation obtains pyrolysis gas, tar and coke.Coke enters calcining fluidized-bed internal combustion, and its heat transforms to thermophore, and thermophore turns back to the reformation fluidized-bed with this part heat, reforms to coke tar cracking and pyrolysis gas institute's heat requirement is provided.In addition, coke enters calcining fluidized-bed internal combustion, has improved dust removal efficiency, can obviously reduce the impurity such as dust in the synthetic gas, charcoal particle.The pyrolysis gas that gasification generates is follow-up to be processed through reforming again, has reduced the requirement to gasification.
(4) compare with the method that the biomass of routine are produced synthetic gas, the present invention is convenient to realize the integrated of heat.In the present invention, coke will offer pyrolysis gas by thermophore at the heat that calcining fluidized-bed internal combustion generates, for the reformation of pyrolysis gas and wherein the coke tar cracking reaction condition is provided.This just makes the unmanageable coke of script be fully used.
Description of drawings
Fig. 1 is structural representation of the present invention.
Have among the figure: hopper 1, moisture eliminator 2, screw feeder 3, pyrolysis fluidized-bed 4, reformation fluidized-bed 5, reformation cyclonic separator 6, the first U-shaped material returning device 7, the second U-shaped material returning device 8, calcining fluidized-bed 9, calcining cyclonic separator 10, the 3rd U-shaped material returning device 11, wind-cowl air distribution plate 12, steam entry 401, synthetic gas inlet mouth 402, oxygen intake 901, syngas outlet 601, exhanst gas outlet 1001, the first returning charge nitrogen inlet 701, the second returning charge nitrogen inlet 801, the 3rd returning charge nitrogen inlet 1101.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail.
As shown in Figure 1, a kind of device for preparing synthetic gas based on double-fluidized-bed gasifying biomass of the present invention comprises hopper 1, moisture eliminator 2, screw feeder 3, pyrolysis fluidized-bed 4, reformation fluidized-bed 5, reformation cyclonic separator 6, calcining fluidized-bed 9, calcining cyclonic separator 10, the first U-shaped material returning device 7, the second U-shaped material returning device 8 and the 3rd U-shaped material returning device 11.The bottom of pyrolysis fluidized-bed 4 is provided with steam entry 401.The bottom of calcining fluidized-bed 9 is provided with oxygen intake 901.The top of reformation cyclonic separator 6 is provided with syngas outlet 601.The top of calcining cyclonic separator 10 is provided with exhanst gas outlet 1001.The bottom of the first U-shaped material returning device 7 is provided with the first returning charge nitrogen inlet 701.Pass into nitrogen in the first returning charge nitrogen inlet 701, as feedback air, promote the carrying out of returning charge process.The bottom of the second U-shaped material returning device 8 is provided with the second returning charge nitrogen inlet 801.Pass into nitrogen in the second returning charge nitrogen inlet 801, as feedback air, promote the carrying out of returning charge process.The bottom of the 3rd U-shaped material returning device 11 is provided with the 3rd returning charge nitrogen inlet 1101.Pass into nitrogen in the 3rd returning charge nitrogen inlet 1101, as feedback air, promote the carrying out of returning charge process.The discharge port of hopper 1 links to each other with the opening for feed of moisture eliminator 2, the discharge port of moisture eliminator 2 links to each other with the feed end of screw feeder 3, the discharge end of screw feeder 3 is positioned at the inner chamber top of pyrolysis fluidized-bed 4, the bottom of pyrolysis fluidized-bed 4 is connected by the bottom of the second U-shaped material returning device 8 with calcining fluidized-bed 9, the top of calcining fluidized-bed 9 is connected with the top of calcining cyclonic separator 10, the bottom of calcining cyclonic separator 10 is connected with the bottom of reformation fluidized-bed 5 by the 3rd U-shaped material returning device 11, the top of reformation fluidized-bed 5 is connected with the top of reformation cyclonic separator 6, and the bottom of reformation cyclonic separator 6 is connected with the bottom of pyrolysis fluidized-bed 4 by the first U-shaped material returning device 7.
Further, above-mentionedly prepare the device of synthetic gas based on double-fluidized-bed gasifying biomass, also comprise the T shape pipe that contains the first port, the second port and the 3rd port.The first port of this T shape pipe is connected on the syngas outlet 601, the second port is connected to the top of moisture eliminator 2, the 3rd port is the synthetic gas collecting terminal, and the bottom of pyrolysis fluidized-bed 4 also is provided with synthetic gas inlet mouth 402, and the bottom of moisture eliminator 2 is communicated with synthetic gas inlet mouth 402.Discharge the high-temperature gas of synthetic gas from syngas outlet 601.T shape pipe is set, can utilizes the high temperature of synthetic gas, biomass material is carried out drying.Synthetic gas after the heat exchange flows in the pyrolysis fluidized-bed 4 by pipeline again.
Further, describedly prepare the device of synthetic gas based on double-fluidized-bed gasifying biomass, also comprise wind-cowl air distribution plate 12, wind-cowl air distribution plate 12 is fixed on the bottom surface of pyrolysis fluidized-bed 4 inboards.Wind-cowl air distribution plate 12 is set, can cloth wind even, make that biomass material evenly mixes with water vapour in the pyrolysis fluidized-bed 4, set up good fluidized state, simultaneously, the effect that the blast cap orientation is blown is conducive to coke and Wingdale and enters in the calcining fluidized-bed 9 through the second U-shaped material returning device 8.
The above-mentioned device for preparing synthetic gas based on double-fluidized-bed gasifying biomass prepares the method for synthetic gas, comprises following process:
In hopper 1, drop into biomass material, biomass material is sent into carried out drying in the moisture eliminator 2, make the water content of dried biomass material in 5%.Dried biomass material is sent into by screw feeder 3 in the pyrolysis fluidized-bed 4 that is preinstalled with Wingdale, simultaneously, passed into water vapour to the steam entry 401 of pyrolysis fluidized-bed 4 bottoms.Water vapour is as vaporized chemical.When pyrolysis fluidized-bed 4 was heated to 750-850 ℃, biomass material was at pyrolysis fluidized-bed 4 interior pyrolytic gasifications, and Heat of Formation is vented one's spleen and solid residue.Comprise the products such as carbon monoxide, hydrogen, carbonic acid gas, methane and tar in the pyrolysis gas.Solid residue comprises coke.Pyrolysis gas rises in the reformation fluidized-bed 5, and heated reformate fluidized-bed 5 makes the temperature of reformation fluidized-bed 5 remain on 900 ℃.Solid residue is deposited on the bottom of pyrolysis fluidized-bed 4, and solid residue and Wingdale enter in the calcining fluidized-bed 9 through the second material returning device 8.Heating and calcining fluidized-bed 9, make the temperature in the calcining fluidized-bed 9 remain on 950 ℃, oxygen intake 901 to calcining fluidized-bed 9 passes into oxygen, coke in the solid residue and oxygen combustion, emit a large amount of heats, making the Decomposition of Calcium Carbonate in the Wingdale is solid particulate calcium oxide and atmospheric carbon dioxide.At the top of calcining fluidized-bed 9, calcium carbonate is decomposed into calcium oxide and carbonic acid gas fully, forms gas-solid two-phase product.Gas in the gas-solid two-phase product is mainly carbonic acid gas, also comprises a small amount of not oxygen of complete reaction and the nitrogen that returning charge is used.Solid in the gas-solid two-phase product refers to calcium oxide.This gas-solid two-phase product is after calcining cyclonic separator 10 separates, and flue gas is discharged from the exhanst gas outlet 1001 of calcining cyclonic separator 10, and calcium oxide turns back to the bottom of reformation fluidized-bed 5 through the 3rd U-shaped material returning device 11.Flue gas mainly is the gas in the gas-solid two-phase product, adds a small amount of solid particle dust.In reformation fluidized-bed 5, pyrolysis gas carries calcium oxide and rises, calcium oxide absorbs the carbonic acid gas in the pyrolysis gas, form calcium carbonate, promote water gas shift reaction and methane reforming reaction, simultaneously, calcium oxide is as the catalyzer of coke tar cracking, catalytic cracking of tar becomes hydrogen and CO (carbon monoxide converter) gas, thereby the tar content in the pyrolysis gas reduces greatly, and the output of synthetic gas obviously improves.Pyrolysis gas obtains reformed gas after the 5 interior reformations of reformation fluidized-bed.Reformed gas is after reformation cyclonic separator 6 gas solid separation, reformation cyclonic separator 6 isolated calcium carbonate send back in the pyrolysis fluidized-bed 4 through the first U-shaped material returning device 7, realizing the thermophore recycle, is synthetic gas from syngas outlet 601 Exhaust Gas of reformation cyclonic separator 6.
Further, for the high temperature that utilizes the synthetic gas of discharging from syngas outlet 601 comes the dried biomass raw material, employing will be from the synthetic gas of syngas outlet 601 discharges, isolate wherein a part of synthetic gas, send in the moisture eliminator 2, make this partial synthesis gas and biomass material carry out heat exchange, the synthetic gas after the heat exchange returns in the pyrolysis fluidized-bed 4 from the synthetic gas inlet mouth 402 of pyrolysis fluidized-bed 4.
Said apparatus, biomass are sent in the pyrolysis fluidized-bed by screw feeder after drying, and water vapour reacts, and pyrolytic gasification, the pyrolysis gas of generation rise in the reforming reaction bed; Solid residue after the pyrolysis is mainly coke, and coke and thermophore calcium carbonate are in material returning device enters the calcining fluidized-bed; The calcining fluidized-bed passes into oxygen, make the coke heat release of in oxygen, burning, for the decomposition of calcium carbonate provides heat, Decomposition of Calcium Carbonate is calcium oxide and carbonic acid gas, through the cyclonic separator gas solid separation, flue gas is discharged, calcium oxide particle then turns back to the bottom of reforming reaction bed, under the effect of carrying secretly of pyrolysis gas air-flow, rise, calcium oxide on the one hand absorbing carbon dioxide generates calcium carbonate, promotes on the other hand the cracking of tar, improves the calorific value of reformed gas, reformed gas obtains synthetic gas through gas solid separation, and the calcium carbonate granule of regeneration turns back to pyrolysis fluidized-bed internal recycle and uses; The synthetic gas sensible heat that utilizes a part to produce can be the biomass drying provides heat.
In the aforesaid method, select Wingdale as the heat-carrying particle, in calcining fluidized-bed 9, decompose and heat up, for the reaction in the reformate stream bed 5 provides heat, and promoting water gas shift reaction, methane reforming reaction and coke tar cracking reaction, regeneration realizes recycling then.The heat-carrying particle also can be selected N
i/ Al
2O
3Or Ca/Al
2O
3
Claims (5)
1. device for preparing synthetic gas based on double-fluidized-bed gasifying biomass, it is characterized in that, this device comprises hopper (1), moisture eliminator (2), screw feeder (3), pyrolysis fluidized-bed (4), reformation fluidized-bed (5), reformation cyclonic separator (6), calcining fluidized-bed (9), calcining cyclonic separator (10), the first U-shaped material returning device (7), the second U-shaped material returning device (8) and the 3rd U-shaped material returning device (11)
The bottom of described pyrolysis fluidized-bed (4) is provided with steam entry (401), the bottom of calcining fluidized-bed (9) is provided with oxygen intake (901), the top of reformation cyclonic separator (6) is provided with syngas outlet (601), and the top of calcining cyclonic separator (10) is provided with exhanst gas outlet (1001); The bottom of the first U-shaped material returning device (7) is provided with the first returning charge nitrogen inlet (701), and the bottom of the second U-shaped material returning device (8) is provided with the second returning charge nitrogen inlet (801), and the bottom of the 3rd U-shaped material returning device (11) is provided with the 3rd returning charge nitrogen inlet (1101);
The discharge port of described hopper (1) links to each other with the opening for feed of moisture eliminator (2), the discharge port of moisture eliminator (2) links to each other with the feed end of screw feeder (3), the discharge end of screw feeder (3) is positioned at the inner chamber top of pyrolysis fluidized-bed (4), the bottom of pyrolysis fluidized-bed (4) is connected by the bottom of the second U-shaped material returning device (8) with calcining fluidized-bed (9), the top of calcining fluidized-bed (9) is connected with the top of calcining cyclonic separator (10), the bottom of calcining cyclonic separator (10) is connected with the bottom of reformation fluidized-bed (5) by the 3rd U-shaped material returning device (11), the top of reformation fluidized-bed (5) is connected with the top of reformation cyclonic separator (6), and the bottom of reformation cyclonic separator (6) is connected with the bottom of pyrolysis fluidized-bed (4) by the first U-shaped material returning device (7).
2. the device for preparing synthetic gas based on double-fluidized-bed gasifying biomass according to claim 1, it is characterized in that, also comprise the T shape pipe that contains the first port, the second port and the 3rd port, the first port of this T shape pipe is connected on the syngas outlet (601), the second port is connected to the top of moisture eliminator (2), the 3rd port is the synthetic gas collecting terminal, the bottom of pyrolysis fluidized-bed (4) also is provided with synthetic gas inlet mouth (402), and the bottom of moisture eliminator (2) is communicated with synthetic gas inlet mouth (402).
3. according to claim 1ly prepare the device of synthetic gas based on double-fluidized-bed gasifying biomass, it is characterized in that also comprise wind-cowl air distribution plate (12), wind-cowl air distribution plate (12) is fixed on the bottom surface of pyrolysis fluidized-bed (4).
4. one kind is utilized the device for preparing synthetic gas based on double-fluidized-bed gasifying biomass claimed in claim 1 to prepare the method for synthetic gas, it is characterized in that described method comprises following process:
In hopper (1), drop into biomass material, biomass material is sent in the moisture eliminator (2) carried out drying, make the water content of dried biomass material in 5%;
Dried biomass material is sent into by screw feeder (3) in the pyrolysis fluidized-bed (4) that is preinstalled with Wingdale, and simultaneously, the steam entry (401) bottom pyrolysis fluidized-bed (4) passes into water vapour; With pyrolysis fluidized-bed (4) when being heated to 750-850 ℃, biomass material is pyrolytic gasification in pyrolysis fluidized-bed (4), Heat of Formation is vented one's spleen and solid residue, comprise carbon monoxide in the pyrolysis gas, hydrogen, carbonic acid gas, the product such as methane and tar, solid residue comprises coke, pyrolysis gas rises in the reformation fluidized-bed (5), heated reformate fluidized-bed (5), make the temperature of reformation fluidized-bed (5) remain on 900 ℃, solid residue is deposited on the bottom of pyrolysis fluidized-bed (4), and solid residue and Wingdale enter in the calcining fluidized-bed (9) through the second material returning device (8);
Heating and calcining fluidized-bed (9), make the temperature in the calcining fluidized-bed (9) remain on 950 ℃, oxygen intake (901) to calcining fluidized-bed (9) passes into oxygen, coke in the solid residue and oxygen combustion, emit a large amount of heats, making the Decomposition of Calcium Carbonate in the Wingdale is solid particulate calcium oxide and atmospheric carbon dioxide; At the top of calcining fluidized-bed (9), calcium carbonate is decomposed into calcium oxide and carbonic acid gas fully, forms gas-solid two-phase product; This gas-solid two-phase product is after calcining cyclonic separator (10) separates, and flue gas is discharged from the exhanst gas outlet (1001) of calcining cyclonic separator (10), and calcium oxide turns back to the bottom of reformation fluidized-bed (5) through the 3rd U-shaped material returning device (11);
In reformation fluidized-bed (5), pyrolysis gas carries calcium oxide and rises, calcium oxide absorbs the carbonic acid gas in the pyrolysis gas, form calcium carbonate, promote water gas shift reaction and methane reforming reaction, simultaneously, calcium oxide is as the catalyzer of coke tar cracking, catalytic cracking of tar generates hydrogen and CO (carbon monoxide converter) gas, pyrolysis gas obtains reformed gas after reforming in reformation fluidized-bed (5), reformed gas is after reformation cyclonic separator (6) gas solid separation, the isolated calcium carbonate of reformation cyclonic separator (6) sends back in the pyrolysis fluidized-bed (4) through the first U-shaped material returning device (7), realizing the thermophore recycle, is synthetic gas from syngas outlet (601) Exhaust Gas of reformation cyclonic separator (6).
5. a device for preparing synthetic gas based on double-fluidized-bed gasifying biomass claimed in claim 4 prepares the method for synthetic gas, it is characterized in that, synthetic gas from syngas outlet (601) discharge, isolate wherein a part of synthetic gas, send in the moisture eliminator (2), make this partial synthesis gas and biomass material carry out heat exchange, the synthetic gas after the heat exchange returns in the pyrolysis fluidized-bed (4) from the synthetic gas inlet mouth (402) of pyrolysis fluidized-bed (4).
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| CN103305285A (en) * | 2013-06-17 | 2013-09-18 | 东南大学 | Device and method for preparing low-tar high-heat-value combustible gas by three-section-type gasification of biomass |
| CN103725329A (en) * | 2013-12-24 | 2014-04-16 | 山东百川同创能源有限公司 | Low-tar pyrolytic device in dual bed structure and pyrolytic method |
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