CN115247084A - High-quality synthesis gas preparation system based on biomass self-heating source pyrolysis gasification - Google Patents
High-quality synthesis gas preparation system based on biomass self-heating source pyrolysis gasification Download PDFInfo
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- CN115247084A CN115247084A CN202210801942.4A CN202210801942A CN115247084A CN 115247084 A CN115247084 A CN 115247084A CN 202210801942 A CN202210801942 A CN 202210801942A CN 115247084 A CN115247084 A CN 115247084A
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- 238000002309 gasification Methods 0.000 title claims abstract description 129
- 239000002028 Biomass Substances 0.000 title claims abstract description 70
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 66
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 43
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000010438 heat treatment Methods 0.000 title claims description 3
- 238000002485 combustion reaction Methods 0.000 claims abstract description 62
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 55
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000002918 waste heat Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 3
- 241000270295 Serpentes Species 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 abstract description 21
- 238000000034 method Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000004177 carbon cycle Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009510 drug design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/58—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels combined with pre-distillation of the fuel
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/0916—Biomass
Abstract
The invention discloses a high-quality synthesis gas preparation system based on biomass self-heat source pyrolysis gasification, which comprises a combustion furnace and a gasification pipeline, wherein the main body part of the gasification pipeline is positioned in the combustion furnace, the front end of the gasification pipeline is provided with a biomass material inlet, the rear end of the gasification pipeline is provided with a synthesis gas outlet, the gasification pipeline can pyrolyze and gasify biomass introduced from the biomass material inlet in a sectional pyrolysis gasification mode, and leads out generated synthesis gas from the synthesis gas outlet, the combustion furnace is provided with a residual carbon storage bin at the rear end of the gasification pipeline and is provided with a residual carbon feeder for leading residual carbon generated after pyrolysis gasification of the gasification pipeline into the combustion furnace for combustion, so as to provide a heat source for pyrolysis gasification of the biomass in the gasification pipeline. According to the invention, the biomass pyrolysis gasification and the combustion process are mutually separated and coupled with multi-section pyrolysis gasification, so that the quality of the synthesis gas is greatly improved, and meanwhile, the heat source is provided for the pyrolysis gasification by combusting the biomass pyrolysis gasification residual solid carbon, so that the efficient utilization of the biomass energy is realized.
Description
Technical Field
The invention relates to the technical field of biomass treatment, in particular to a high-quality synthesis gas preparation system based on biomass self-heat source pyrolysis and gasification.
Background
The biomass forms carbon cycle in nature through photosynthesis, so the biomass is clean energy with zero carbon emission, does not generate greenhouse effect, has rich biomass reserves, therefore, the biomass resource is fully and effectively utilized, and the method has important significance for improving the energy utilization mode and solving the increasingly serious problems of environment and energy shortage.
Currently, the common process for biomass gasification mainly adopts air as a gasifying agent, and the processes of drying, pyrolysis gasification, partial oxidation combustion, synthesis gas reduction and the like of biomass are performed through vertical furnaces such as a fluidized bed and a fluidized bed, so that part of the biomass is converted into combustible gas (synthesis gas), and the produced synthesis gas is applied to industry.
The traditional biomass gasification process firstly adopts partial oxidation heat supply, the combustion and pyrolysis gasification are in the same process, and incombustible gas is introduced to be mixed with pyrolysis gas in the process, so that the load of a subsequent treatment system is greatly increased, and the quality of pyrolysis synthesis gas is reduced.
Disclosure of Invention
In order to solve the problems, the invention provides a high-quality synthesis gas preparation system based on biomass self-heat source pyrolysis gasification, which can separate the pyrolysis gasification and combustion processes of biomass, increase the pyrolysis gasification reaction time of the biomass, and strengthen the decomposition process of tar, thereby improving the quality of synthesis gas.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a high-quality synthetic gas preparation system based on biomass self-heat source pyrolysis gasification comprises a combustion furnace and a gasification pipeline, wherein the main body part of the gasification pipeline is positioned in the combustion furnace, the front end of the gasification pipeline is provided with a biomass material inlet, the rear end of the gasification pipeline is provided with a synthetic gas outlet extending out of the combustion furnace, the gasification pipeline can pyrolyze and gasify biomass introduced from the biomass material inlet in a sectional type pyrolysis gasification mode, generated synthetic gas is led out from the synthetic gas outlet, the combustion furnace is provided with a residual carbon storage bin at the rear end of the gasification pipeline and is provided with a residual carbon feeder for leading residual carbon generated after pyrolysis and gasification of the gasification pipeline into the combustion furnace to be combusted, and a heat source is provided for pyrolysis and gasification of the biomass in the gasification pipeline.
In the system, the biomass pyrolysis gasification process is carried out in the gasification pipeline, the oxidation combustion is carried out in the combustion furnace, the pyrolysis gasification and the oxidation combustion of the conventional biomass pyrolysis gasification process are separately completed in two independent systems and are mutually coupled, the residual solid carbon generated by the pyrolysis gasification is used as fuel, the heat generated by the oxidation combustion provides a heat source for the pyrolysis gasification, the smoke generated by the combustion and the nitrogen in the combustion improver cannot enter the synthesis gas generated by the pyrolysis gasification, and therefore the quality of the synthesis gas is greatly improved.
Further, a spiral conveying device is arranged in the gasification pipeline, the main body part of the gasification pipeline is arranged in the combustion furnace in a winding manner, and at least one gasification agent inlet is arranged. Therefore, the biomass and the synthesis gas move in the same direction in the gasification pipeline, tar generated by pyrolysis in the previous stage can be catalytically decomposed by solid carbon generated in the previous stage in the subsequent gasification process, the tar amount in the synthesis gas is reduced, the gasification pipeline is arranged in a roundabout manner, the sectional type pyrolysis gasification of the biomass is facilitated, and the space utilization rate of equipment is improved.
Furthermore, the main body part is arranged in a snake shape in the vertical direction of the combustion furnace and extends from bottom to top, so that the heat distribution in the combustion furnace is more in line with the needs of sectional type pyrolysis gasification in the gasification pipeline, three gasification agent inlets are arranged, one is provided with the front end of the main body part, and the other two parts are correspondingly arranged at two bending positions of the main body part, therefore, the pyrolysis gasification of the biomass at different temperatures and reaction atmospheres is realized in a three-sectional type pyrolysis gasification mode, the reaction temperature and the reaction atmosphere required by the pyrolysis and gasification can be effectively controlled, the reaction time is increased, the gas-solid reaction process is enhanced, and the quality of the synthesis gas generated by the pyrolysis gasification is further improved.
Preferably, the outer wall of the gasification pipeline is provided with heat transfer fins to enhance heat transfer between the combustion flue gas and the gasification pipeline.
Preferably, at least two gasification pipelines are arranged in parallel in the combustion furnace along the transverse direction, so as to meet the requirements of different loads of equipment.
Preferably, a waste heat exchanger and a steam superheater are arranged above the combustion furnace, and generated steam can convert heat energy into mechanical energy or perform local heat supply through expansion equipment, so that waste heat recovery and utilization of combustion tail gas are realized, and the energy utilization rate is improved.
Preferably, the combustion furnace adopts a common chain furnace which is provided with a grate, the residual carbon storage bin is positioned above the tail part of the grate, and the feeding mechanism designed below the residual carbon storage bin is utilized to uniformly arrange residual solid carbon on the grate of the chain furnace and play a role of sealing at the same time, so that combustion smoke or air is prevented from entering the residual carbon storage bin, the quality of synthesis gas is improved, the safety of the residual carbon storage bin is ensured, and the arrangement is convenient.
Preferably, a partition air hopper is arranged below the fire grate, the air supply quantity of the partition air hopper is controlled, so that the residual solid carbon can be completely combusted, meanwhile, due to the inflammable characteristic of high-temperature solid carbon, the combustion air quantity can be effectively controlled, the smoke quantity of the gasification furnace is reduced, the temperature in the gasification furnace is increased, and the quality of the biomass pyrolysis gasification synthesis gas is improved. The air inlet pipeline of the partition air hopper is provided with an air preheater which is positioned in a flue of the combustion furnace, and the air introduced into the chain furnace is preheated by utilizing waste heat, so that the combustion efficiency and the overall energy utilization rate are improved.
And the synthetic gas outlet is provided with a draught fan and connected with a cooling and purifying device so as to lead out the synthetic gas conveniently for purification and encapsulation.
Has the advantages that:
according to the invention, the biomass pyrolysis gasification and the combustion process are mutually separated and coupled with multi-section type pyrolysis gasification, so that the quality of the synthesis gas is greatly improved, and meanwhile, the residual solid carbon is gasified by combusting the biomass pyrolysis to provide a heat source for the pyrolysis gasification, so that the high-efficiency utilization of biomass energy is realized.
Drawings
FIG. 1 is a schematic diagram of an exemplary configuration of the present invention;
FIG. 2 is a schematic view of the burner of FIG. 1.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
The high-quality synthesis gas preparation system based on biomass self-heat source pyrolysis gasification as shown in fig. 1 comprises a combustion furnace 1 and a gasification pipeline 2, wherein pyrolysis gasification of biomass is completed in the gasification pipeline 2, and residual carbon generated by pyrolysis gasification is introduced into the combustion furnace 1 for combustion, so as to provide a heat source for biomass pyrolysis gasification in the gasification pipeline 2.
Referring to fig. 2, in the present embodiment, the combustion furnace 1 is preferably a conveyor furnace, the main body portion 20 of the gasification pipe 2 is located in the furnace chamber 10 of the combustion furnace 1, the front end of the main body portion is provided with a biomass material inlet 21 for introducing biomass materials into the gasification pipe 2, the main body portion 20 extends in a serpentine and roundabout manner from bottom to top in the furnace chamber 10, and has an overall "S" -shaped three-stage structure, the main body portion 20 is provided with a screw conveyor 23, the biomass materials introduced from the biomass material inlet 21 are conveyed from front to back by a driving motor 26 located at the front end of the gasification pipe 2, the front end portion of the main body portion 20 introduced into the furnace chamber 10 and two bending positions are respectively provided with a gasifying agent inlet 24, so that the gasification pipe 2 can pyrolyze and gasify the biomass materials introduced from the biomass material inlet 21 in a sectional pyrolysis and gasification manner.
Combustion furnace 1 is equipped with carbon residue storage bin 3 in gasification pipeline 2 rear end below, biomass material is under the promotion of screw conveyor 23 through the remaining solid carbon that produces after pyrolysis gasification in gasification pipeline 2, fall into carbon residue storage bin 3, this carbon residue storage bin 3 bottom disposes carbon residue batcher 4, when being used for carbon residue in carbon residue storage bin 3 reaches the memory space of settlement, supply it to the grate 11 of combustion furnace 1 below on and burn, realize continuous feed, through rational design carbon residue batcher 4 structure, the material memory space in the carbon residue storage bin 3 of control, or set up suitable seal structure at carbon residue storage bin 3 discharge position, can reduce the air that gets into carbon residue storage bin 3, guarantee the quality of synthetic gas and the safety of carbon residue material in carbon residue storage bin 3.
The rear end of the gasification pipeline 2 extends to the outside of the combustion furnace 1 and forms a synthesis gas outlet 22, and the synthesis gas outlet 22 is provided with a draught fan and is connected with a cooling and purifying device, so that the synthesis gas generated by pyrolysis gasification can be conveniently led out for purification and packaging for sale.
The residual solid carbon is stacked on the grate 11, and the grate 11 below distributes along length direction has a plurality of subregion wind scoops 12, gives the amount of wind through control subregion wind scoop 12, can ensure that residual solid carbon burns completely, because high temperature solid carbon has the inflammability, can the effective control amount of wind that burns, reduces the flue gas volume in the stove, promotes the temperature in the burning furnace 1, and then promotes the synthetic gas quality of living beings pyrolysis gasification.
The fire grate 11 moves along the horizontal direction, so that the residual carbon is combusted in the area right below the main body part 20 of the gasification pipeline 2, the heat generated by combustion provides a heat source for pyrolysis and gasification of biomass in the gasification pipeline 2, the tail end position of the running direction of the fire grate 11 is provided with a slag collecting chamber 14 for collecting the residual ash left after the combustion of the residual solid carbon, and an ash scraping plate 11a is arranged at the position close to the slag collecting chamber 14 so as to clean the ash adhered on the fire grate 11.
In order to enhance the heat transfer between the combustion fumes and the gasification duct 2, heat transfer fins 25 are also distributed on the outer wall of the gasification duct 2.
It can be seen from combining fig. 1 that, be equipped with waste heat exchanger 5 and steam superheater 6 above the furnace 10 that fires burning furnace 1, the burning tail gas is through waste heat exchanger 5 and steam superheater 6, and the steam that produces can be through professional expansion equipment with heat energy conversion for mechanical energy electricity generation or carry out the district's heat supply, realizes burning tail gas's waste heat recovery and utilizes, promotes energy utilization.
The combustion tail gas enters a flue 13 behind the combustion furnace 1 after heat exchange of a waste heat exchanger 5 and a steam superheater 6, is discharged to the atmospheric environment through a chimney 18 after dust removal and desulfurization purification by a dust remover 16 and a desulfurizer 17 in sequence, and a dust collecting chamber 15 is arranged below the flue 13 and used for collecting dust remaining in the tail gas.
An air preheater 7 is installed in the flue 13, and the air preheater 7 is located on the air inlet pipeline 7 of the subarea air hopper 12, so that the air introduced into the subarea air hopper 12 is preheated by waste heat, and the combustion efficiency and the overall energy utilization rate are further improved.
The working principle of the high-quality synthesis gas preparation system is as follows:
before biomass is introduced into the gasification pipeline 2, the biomass is firstly crushed into 1cm 3 Left and right sized particles to facilitate movement and pyrolysis gasification reactions within the gasification duct 2.
Granular biomass enters the main body part 20 from a biomass material inlet 21 at the lower end of the gasification pipeline 2 and is conveyed upwards under the driving of the spiral conveying device 23, the biomass enters the gasification pipeline 2, the gasifying agent oxygen is introduced into a first gasifying agent inlet 24, and the biomass particles and the gasifying agent are subjected to drying and pyrolysis reaction in a first stage at a first section of the pipeline, so that the biomass is converted into solid carbon, and a large amount of pyrolysis gas, tar and other substances are generated.
When the pyrolyzed solid carbon enters the second section of the pipeline, gasifying agent steam is introduced into a second gasifying agent inlet 24, and substances such as the solid carbon, the steam, a small amount of oxygen, tar and the like are subjected to second-stage water-coal reaction and reduction reaction in the gasifying pipeline 2, so that the produced tar is further decomposed under the catalysis of the solid carbon, and the solid carbon and the steam are further reacted to generate more carbon monoxide and hydrogen.
When the second stage reaction product enters the third section of the gasification pipeline, a small amount of steam is introduced into the third gasification agent inlet 24, so that the solid carbon and the steam react with each other through water-coal reaction, and the tar content in the final synthesis gas is reduced through the catalysis and filtration effects of the solid carbon, so that the load of rear-end processing equipment is effectively reduced, and the quality of the synthesis gas is further improved.
After the three-stage pyrolysis gasification, the generated synthesis gas is led out from a synthesis gas outlet 22 through a draught fan, and then enters a cooling and purifying device for cooling, purifying and packaging for sale. The residual solid carbon falls into the residual carbon storage bin 3 and is distributed on a fire grate 11 of the combustion furnace 1 by the residual carbon feeder 4 for oxidation combustion, so that a heat source is provided for pyrolysis and gasification of biomass in the gasification pipeline 2.
It should be understood that the type and amount of gasifying agent introduced into each gasifying agent inlet 24 can be selected according to the type and characteristics of biomass, and are not limited to the types exemplified in the above embodiments.
In addition, the gasification pipe 2 may be provided in a plurality of rows in the furnace 10 of the combustion furnace 1 according to the design capacity and the load.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (9)
1. A high-quality synthesis gas preparation system based on biomass self-heating source pyrolysis gasification comprises a combustion furnace (1) and a gasification pipeline (2), and is characterized in that: the main body part (20) of the gasification pipeline (2) is located in the combustion furnace (1), the front end of the gasification pipeline is provided with a biomass material inlet (21), the rear end of the gasification pipeline is provided with a synthesis gas outlet (22) extending out of the combustion furnace (1), the gasification pipeline (2) can pyrolyze and gasify biomass introduced from the biomass material inlet (21) in a sectional pyrolysis gasification mode, the generated synthesis gas is led out from the synthesis gas outlet (22), the combustion furnace (1) is provided with a residual carbon storage bin (3) at the rear end of the gasification pipeline (2) and is provided with a residual carbon feeder (4) for introducing residual carbon generated after pyrolysis and gasification of the gasification pipeline (2) into the combustion furnace (1) for combustion, and a heat source is provided for pyrolysis and gasification of the biomass in the gasification pipeline (2).
2. The system for preparing high-quality synthesis gas based on biomass self-heat source pyrolysis gasification according to claim 1, characterized in that: the gasification pipeline (2) is internally provided with a spiral conveying device (23), the main body part (20) of the gasification pipeline (2) is arranged in the combustion furnace (1) in a winding way, and is provided with at least one gasification agent inlet (24).
3. The system for preparing high-quality synthesis gas based on biomass self-heat source pyrolysis gasification according to claim 2, characterized in that: the main body part (20) is arranged in a snake shape in the vertical direction of the combustion furnace (1) and extends from bottom to top, the gasification agent inlets (24) are arranged at three positions, one position is provided with the front end of the main body part (20), and the other two positions are correspondingly arranged at two bending positions of the main body part (20).
4. The system for preparing high-quality synthesis gas based on biomass self-heat source pyrolysis gasification according to claim 2, characterized in that: and heat transfer fins (25) are arranged on the outer wall of the gasification pipeline (2).
5. The system for preparing high-quality synthesis gas based on biomass self-heat source pyrolysis gasification according to claim 2, characterized in that: the number of the gasification pipelines (2) is at least two, and the gasification pipelines are arranged in parallel along the transverse direction in the combustion furnace (1).
6. The system for preparing high-quality synthesis gas based on biomass self-heat source pyrolysis gasification according to claim 1, characterized in that: and a waste heat exchanger (5) and a steam superheater (6) are arranged above the combustion furnace (1).
7. The system for preparing high-quality synthesis gas based on biomass self-heat source pyrolysis gasification according to claim 1, characterized in that: the combustion furnace (1) is a chain furnace and is provided with a fire grate (11), and the residual carbon storage bin (3) is positioned above the tail part of the fire grate (11).
8. The system for preparing high-quality synthetic gas based on biomass self-heat source pyrolysis gasification according to claim 7, characterized in that: a partition air hopper (12) is arranged below the fire grate (11), an air preheater (7) is arranged on an air inlet pipeline of the partition air hopper (12), and the air preheater (7) is positioned in a flue (13) of the combustion furnace (1).
9. The system for preparing high-quality synthesis gas based on biomass self-heat source pyrolysis gasification according to any one of claims 1 to 8, characterized in that: the synthesis gas outlet (22) is provided with a draught fan and is connected with a cooling and purifying device.
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