CN112111301B - Combined type partial circulation biomass gasification furnace and working method thereof - Google Patents
Combined type partial circulation biomass gasification furnace and working method thereof Download PDFInfo
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- 238000002309 gasification Methods 0.000 title claims abstract description 77
- 239000002028 Biomass Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000428 dust Substances 0.000 claims abstract description 32
- 238000005192 partition Methods 0.000 claims abstract description 9
- 239000007787 solid Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000000197 pyrolysis Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 77
- 239000010902 straw Substances 0.000 description 5
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- -1 heating Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011269 tar Substances 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
- C10J3/02—Fixed-bed gasification of lump fuel
- C10J3/20—Apparatus; Plants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/721—Multistage gasification, e.g. plural parallel or serial gasification stages
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a combined type partial circulation biomass gasification furnace and a working method thereof, belonging to the technical field of biomass energy gasification utilization. The horizontal furnace body feeding section is respectively connected with the feeding system and the drying-gasification section; the drying-gasification section is embedded in the middle upper part in the vertical furnace body and is separated from the vertical furnace body through an upper partition plate and a lower partition plate respectively, and an outlet of the drying-gasification section is communicated with the middle part of the vertical furnace body; the upper clapboard and the lower clapboard are provided with vent holes; the upper part of the vertical furnace body is provided with a crude gas outlet which is connected with a dust removal device, the dust removal device is connected with a combustible gas outlet pipe, and a solid outlet of the dust removal device is communicated with the middle part of the vertical furnace body; one side of the bottom of the vertical furnace body is provided with an air inlet, and the other side of the bottom of the vertical furnace body is provided with an ash outlet; the gasified gas circulating device is arranged outside the vertical furnace body, an inlet at the upper end of the gasified gas circulating device is communicated with the middle part of the vertical furnace body, and an inlet at the lower end of the gasified gas circulating device is communicated with the air inlet. Can improve the gasification efficiency and greatly reduce the tar content in the generated combustible gas.
Description
Technical Field
The invention belongs to the technical field of biomass energy gasification utilization, and particularly relates to a combined type partial circulation biomass gasification furnace and a working method thereof.
Background
With the rapid development of economy in China, the demand for novel clean energy is continuously increased, and biomass energy has wide application and development prospects as an energy substance with low carbon emission and sustainable regeneration, but also has the defects of low heat value, difficult storage and the like. The biomass gasification technology can convert low-grade biomass energy into high-quality gas fuel, and can replace fossil fuels such as natural gas and the like to be used in the fields of household gas, heating, gas power generation and the like, so that the biomass gasification technology is widely applied. However, tar is inevitably generated in the biomass gasification process, so that the biomass gasification efficiency is reduced, and meanwhile, the tar can block and corrode pipelines, so that an effective tar treatment method is lacked at the present stage, and the better development of the biomass gasification technology is limited.
Meanwhile, the distribution of villages and towns and rural areas in China is dispersed, the amount of wastes such as straws generated by cultivation is large, and the direct combustion can cause serious environmental pollution, so that a large amount of straw wastes are buried in the ground and directly returned to the field, the problem of increase of plant diseases and insect pests is also caused, and the sprouting and rooting of new crops can be influenced under the conditions of too much straw wastes returned to the field and low decomposition speed. The patent with the publication number of CN210620724U discloses a biomass gasification furnace with a novel structure, wherein a fuel gas recycling output port is arranged on a fuel gas discharge pipe, but purified biomass gasification gas is returned, so that the effect of obviously reducing tar content cannot be achieved, and a longer purification pipeline is easy to cause tar condensation and blockage.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a combined type partial circulation biomass gasification furnace and a method for operating the same, which can improve gasification efficiency and greatly reduce tar content in generated combustible gas.
The invention is realized by the following technical scheme:
the invention discloses a combined type partial circulation biomass gasification furnace, which comprises a horizontal furnace body, a vertical furnace body, a feeding system, a dust removal device and a gasification gas circulation device, wherein the horizontal furnace body is provided with a plurality of vertical furnace bodies;
the horizontal furnace body comprises a feeding section and a drying-gasification section, wherein one end of the feeding section is connected with the feeding system, and the other end of the feeding section is connected with an inlet of the drying-gasification section; the drying-gasifying section is embedded in the middle upper part of the vertical furnace body, the drying-gasifying section is separated from the upper part of the vertical furnace body through an upper partition plate, the drying-gasifying section is separated from the middle part of the vertical furnace body through a lower partition plate, and an outlet of the drying-gasifying section is communicated with the middle part of the vertical furnace body; the upper clapboard and the lower clapboard are provided with vent holes; the upper part of the vertical furnace body is provided with a crude gas outlet, the crude gas outlet is connected with an inlet of a dust removal device, a gas outlet of the dust removal device is connected with a combustible gas outlet pipe, and a solid outlet of the dust removal device is communicated with the middle part of the vertical furnace body; one side of the bottom of the vertical furnace body is provided with an air inlet, and the other side of the bottom of the vertical furnace body is provided with an ash outlet; the gasified gas circulating device is arranged outside the vertical furnace body, an inlet at the upper end of the gasified gas circulating device is communicated with the inside of the vertical furnace body, and an inlet at the lower end of the gasified gas circulating device is communicated with the air inlet.
Preferably, the feeding system comprises a feeding hopper, a hydraulic feeding device and a feeding plate, the feeding hopper is arranged above the feeding section, the hydraulic feeding device and the feeding plate are arranged in the feeding section, and the hydraulic feeding device is connected with the feeding plate.
Preferably, the length of the feed section is 1/3 for the horizontal furnace and the length of the drying-gasification section is 2/3 for the horizontal furnace.
Preferably, the cross-sectional area of the feed section is smaller than the cross-sectional area of the drying-gasification section.
Preferably, the vent holes are mesh vent holes.
Preferably, the gasified gas circulating device comprises a circulating pipe, a one-way valve is arranged on the circulating pipe, the circulating pipe is connected with the outer wall of the vertical furnace body, an inlet at the upper end of the circulating pipe is communicated with the interior of the vertical furnace body, and an inlet at the lower end of the circulating pipe is communicated with the air inlet.
Preferably, the dust removing device is a cyclone dust removing device.
Preferably, the outer wall of the gasification gas circulation device and the outer walls of the middle part and the upper part of the vertical furnace body are provided with heat insulation layers.
Preferably, a slope is arranged between the air inlet and the ash outlet, and the height of the slope on the air inlet side is greater than that of the slope on the ash outlet side.
The invention discloses a working method of the combined type partial circulation biomass gasification furnace, which comprises the following steps:
after ignition is carried out in the vertical furnace body, air is introduced into an air inlet, the biomass raw material enters a drying-gasifying section from a feeding section of the horizontal furnace body through a feeding system, and is subjected to primary gasification reaction after drying and is analyzed through volatilization; under the action of a feeding system, biomass raw materials which are not completely gasified enter the middle part of the vertical furnace body to carry out pyrolysis gasification reaction to generate high-temperature combustible gas and tar, and biomass residues are discharged from an ash outlet; part of high-temperature combustible gas flows upwards through the biomass raw material in the drying-gasification section through the vent holes to provide heat for drying and primary gasification of the biomass raw material, the temperature of the high-temperature combustible gas is reduced while the high-temperature combustible gas releases heat, tar is condensed and separated out and adsorbed on the biomass raw material, and the adsorbed tar enters the vertical furnace body along with the biomass material and is combusted and decomposed at high temperature to release heat; the combustible gas continuously goes upward to enter the dust removal device through the crude gas outlet for dust removal and then is led out through the combustible gas outlet pipe, and biomass debris obtained by the dust removal device is collected and then sent into the vertical furnace body for combustion and utilization; the other part of high-temperature combustible gas is introduced to the air inlet through the gasification gas circulating device, and is mixed with the inlet air and then is sent to the vertical furnace body again for combustion, and heat is released.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a combined type partial circulation biomass gasification furnace, which divides the gasification process of biomass into two parts through a horizontal furnace body and a vertical furnace body, wherein the drying of biomass raw materials and the separation of volatile matters are mainly generated in the horizontal furnace body, and the main gasification activity is carried out through combustion in the vertical furnace body to generate a large amount of combustible gas and partial tar; most of the generated high-temperature gas goes upward and enters the horizontal furnace body through the vent holes to provide heat for drying and primary pyrolysis of biomass; the temperature of the high-temperature gas is reduced while the high-temperature gas passes through the biomass material, part of tar is condensed and separated out, and at the moment, the biomass material plays a certain role in filtering, absorbs the condensed and separated tar, and then enters the vertical furnace body to be combusted and decomposed; the high-temperature gas generated by the other part is mixed with inlet air through the gasified gas circulating device, and enters the vertical furnace body again through the air inlet, the combustion reaction is carried out to provide heat, the mixing of the high-temperature gas improves the inlet air temperature, so that the combustion temperature in the furnace is improved, the pyrolysis of tar can be effectively promoted, and meanwhile, the biomass carbon on the bottom layer at high temperature can promote the conversion of the tar, so that the gasification efficiency of biomass can be improved in many aspects.
Furthermore, the hydraulic feeding device of the feeding system can push and compact the biomass raw materials in a reciprocating manner, plays a role in material sealing in the feeding section and prevents air leakage in the gasification process.
Furthermore, the length of the feeding section is 1/3 of the horizontal furnace body, and the length of the drying-gasifying section is 2/3 of the horizontal furnace body, so that on one hand, the process of the gasification furnace can be controlled through the feeding section, and on the other hand, the longer drying-gasifying section can provide sufficient drying and primary gasifying time for materials.
Furthermore, the sectional area of the feeding section is smaller than that of the drying-gasifying section, so that the biomass raw material entering the drying-gasifying section can be dispersed and spread out, and the drying and primary gasifying efficiency is improved.
Furthermore, the vent holes are net-shaped vent holes, so that the flow area is large and the vent holes are not easy to block.
Furthermore, a one-way valve is arranged in the circulating pipe, on one hand, gas in the gasification furnace is not enough to maintain heat release and circulation at the initial stage of starting the gasification furnace, and air can be prevented from entering the vertical furnace body through the circulating pipeline; on the other hand, the amount of combustible gas participating in circulation can be adjusted according to the generated gas, so that the starting process is smoother.
Further, the combustible gas and the biomass fragments which are not completely combusted can be efficiently separated, the separation efficiency is high, and the utilization rate of raw materials is high.
Further, the outer wall of the gasified gas circulating device and the outer walls of the middle part and the upper part of the vertical furnace body are respectively provided with a heat insulating layer, so that the temperature of the upper layer and the circulating pipe in the vertical furnace body can be effectively maintained, the effective drying of the biomass raw material is realized, and the condensation of tar in the generated combustible gas is prevented.
Further, the slope between air intake and the ash hole can effectively promote the lime-ash to discharge, prevents the siltation.
According to the working method of the combined type partial circulation biomass gasification furnace, simple biomass step-by-step gasification is realized through the combined type gasification furnace structure, and the sustainable working capacity of the gasification furnace is improved; gasified gas is filtered through the biomass raw material, and the tar content in the gasified gas is reduced while the heat of the gasified gas is recycled; by using the partial gasified gas circulating pipe, the gasified gas containing the tar is sent back to the furnace body for combustion and utilization, the tar generated in the combustion part improves the temperature in the gasification furnace, and the high-temperature cracking of the tar is promoted. The method reduces the tar content in the gasified gas from multiple aspects, improves the biomass gasification efficiency, is suitable for the use of various biomass fuels, and has good application prospect.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic view of the vent holes provided in the upper and lower partition plates.
In the figure: 1 is horizontal furnace body, 2 is vertical furnace body, 3 is the feed system, 4 is dust collector, 5 is gasification gas circulating device, 6 is the feeder hopper, 7 is hydraulic pressure feeder, 8 is the feed plate, 9 is the feeding section, 10 is the drying-gasification section, 11 is the air vent, 12 is the coarse gas export, 13 is the combustible gas outlet duct, 14 is the circulating pipe, 15 is the check valve, 16 is the supply air duct, 17 is the air intake, 18 is the heat preservation, 19 is the ash hole, 20 is the slope.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are included to illustrate and not to limit the invention:
referring to fig. 1, the combined type biomass gasification furnace with partial circulation of the invention comprises a horizontal furnace body 1, a vertical furnace body 2, a feeding system 3, a dust removal device 4 and a gasification gas circulation device 5.
The feeding system 3 comprises a feeding hopper 6, a hydraulic feeding device 7 and a feeding plate 8, wherein the feeding hopper 6 is arranged above a feeding section 9, the hydraulic feeding device 7 and the feeding plate 8 are arranged in the feeding section 9, and the hydraulic feeding device 7 is connected with the feeding plate 8.
The horizontal furnace body 1 comprises a feeding section 9 and a drying-gasifying section 10, wherein the length of the feeding section 9 is 1/3 of the horizontal furnace body 1, the length of the drying-gasifying section 10 is 2/3 of the horizontal furnace body 1, and the sectional area of the feeding section 9 is smaller than that of the drying-gasifying section 10. One end of the feeding section 9 is connected with the feeding system 3, and the other end is connected with the inlet of the drying-gasifying section 10; the drying-gasifying section 10 is embedded in the middle upper part of the vertical furnace body 2, the drying-gasifying section 10 is separated from the upper part of the vertical furnace body 2 through an upper baffle plate, the drying-gasifying section 10 is separated from the middle part of the vertical furnace body 2 through a lower baffle plate, and the outlet of the drying-gasifying section 10 is communicated with the middle part of the vertical furnace body 2. As shown in fig. 2, the upper partition plate and the lower partition plate are provided with vent holes 11, and the vent holes 11 are preferably mesh vent holes, so that high-temperature gasified gas can pass through the vent holes, and the biomass raw material is prevented from entering the gas outlet along with the combustible gas.
The upper part of the vertical furnace body 2 is provided with a crude gas outlet 12, the crude gas outlet 12 is connected with an inlet of the dust removal device 4, and the dust removal device 4 preferably adopts a cyclone dust removal device. The gas outlet of the dust removing device 4 is connected with a combustible gas outlet pipe 13, and the solid outlet of the dust removing device 4 is communicated with the middle part of the vertical furnace body 2; an air inlet 17 is arranged at one side of the bottom of the vertical furnace body 2, the air inlet 17 is connected with an air supply pipeline 16, and an ash outlet 19 is arranged at the other side; preferably, a slope 20 is arranged between the air inlet 17 and the ash outlet 19, and the height of the slope 20 on the side of the air inlet 17 is greater than that of the slope 20 on the side of the ash outlet 19.
The gasified gas circulating device 5 is arranged on the outer side of the vertical furnace body 2, the gasified gas circulating device 5 comprises a circulating pipe 14, a one-way valve 15 is arranged on the circulating pipe 14, the circulating pipe 14 is connected with the inner wall of the vertical furnace body 2, an inlet at the upper end of the circulating pipe 14 is communicated with the inside of the vertical furnace body 2, and an inlet at the lower end of the circulating pipe 14 is communicated with an air inlet 17. The outer wall of the gasification gas circulating device 5 and the outer walls of the middle part and the upper part of the vertical furnace body 2 are provided with heat insulating layers 18.
The combined type partial circulation biomass gasification furnace of the invention is operated as follows:
biomass raw materials such as straw, rice husk pass through the feeding section 9 that feeder hopper 6 got into horizontal furnace body 1, then hydraulic pressure feeder 7 promotes feed plate 8 with biomass raw materials compaction, can realize the material and seal, prevents to appear gas leakage phenomenon among the gasification. The compacted biomass raw material is sent to a drying-gasifying section 10, and because the sectional area of the drying-gasifying section 10 is larger than that of the feeding section 9, the biomass raw material is spread out again, then is gradually dried, generates primary gasification reaction, and is subjected to volatilization analysis. The biomass raw materials which are not completely gasified can fall off from the horizontal furnace body 1, enter the vertical furnace body 2 to generate main pyrolysis gasification reaction, generate a large amount of high-temperature combustible gas and generate partial tar, and the gasified biomass residues can fall off on the slope 20 of the furnace bottom and then are discharged out of the gasification furnace through the ash outlet 19. Most high temperature combustible gas of generation can be through netted air vent 11 through horizontal furnace body 1, for the drying of biomass raw materials and preliminary gasification provide heat, and self temperature reduction when the high temperature gas releases the heat can lead to the tar condensation to separate out, adsorbs on biomass raw materials when through horizontal furnace body 1, realizes the filtration of biomass raw materials tar in to combustible gas. The adsorbed tar can enter the vertical furnace body 2 along with the biomass material, and is combusted and decomposed at high temperature to release heat. The filtered gas enters the cyclone dust removal device 4 through the gasifier coarse gas outlet 12, and the combustible gas after dust removal is led out through the combustible gas outlet pipe 13; and collecting the biomass scraps obtained by dust removal, and then sending the biomass scraps into a gasification furnace for combustion and utilization. The other part of high-temperature combustible gas is led out through the circulating pipe 14 and is sent to the air supply pipeline 16 close to the air inlet 17, the high-temperature combustible gas and the inlet air are mixed and then are sent into the furnace body again for combustion, heat is released, the temperature of the inlet air is increased due to the mixing of the high-temperature combustible gas and the inlet air, the combustion temperature in the furnace is further increased, the high-temperature cracking of tar can be effectively promoted, and the gasification efficiency is improved. In order to maintain the temperature of the upper layer of the vertical furnace body 2 and the circulating pipe 14, realize effective drying of the biomass raw material and prevent the condensation of tar in the generated combustible gas, the outer part of the upper layer of the vertical furnace body 2 and the outer part of the circulating pipe 14 are both provided with insulating layers 18.
The circulating pipe 14 of the gasified gas circulating device 5 is provided with a one-way valve 15 for preventing gas from flowing backwards, the gas in the gasifier is not enough to maintain the heat release and circulation at the initial stage of starting the gasifier, and the device can prevent inlet air from entering the vertical furnace body 2 through the circulating pipe 14; meanwhile, the device can adjust the amount of combustible gas participating in circulation according to the amount of generated gas, so that the starting process is smoother.
During the use, put into biomass raw materials such as straw through feed system 3 in vertical furnace body 2, use some firearms in vertical furnace body 2 bottom to ignite, let in the air through air intake 17, material seal is guaranteed well to horizontal furnace body 1 feeding section 9. The temperature in the gasification furnace gradually rises, the temperature of each section reaches the requirement, after the generated combustible gas is enough to maintain the drying gasification process in the furnace, the one-way valve 15 on the circulating pipe 14 is opened, part of the generated high-temperature combustible gas is led into the air supply pipeline 16, and the start of the gasification furnace is finished.
The above description is only a part of the embodiments of the present invention, and although some terms are used in the present invention, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention and are to be construed as any additional limitation which is not in accordance with the spirit of the invention. The foregoing is merely an illustration of the present invention for the purpose of providing an easy understanding and is not intended to limit the present invention to the particular embodiments disclosed herein, and any technical extensions or innovations made herein are protected by the present invention.
Claims (7)
1. A combined type partial circulation biomass gasification furnace is characterized by comprising a horizontal furnace body (1), a vertical furnace body (2), a feeding system (3), a dust removal device (4) and a gasification gas circulation device (5);
the horizontal furnace body (1) comprises a feeding section (9) and a drying-gasifying section (10), the sectional area of the feeding section (9) is smaller than that of the drying-gasifying section (10), one end of the feeding section (9) is connected with the feeding system (3), and the other end of the feeding section is connected with an inlet of the drying-gasifying section (10); the drying-gasifying section (10) is embedded in the middle upper part of the vertical furnace body (2), the drying-gasifying section (10) is separated from the upper part of the vertical furnace body (2) through an upper partition plate, the drying-gasifying section (10) is separated from the middle part of the vertical furnace body (2) through a lower partition plate, and an outlet of the drying-gasifying section (10) is communicated with the middle part of the vertical furnace body (2); the upper clapboard and the lower clapboard are provided with vent holes (11), and the vent holes (11) are net-shaped vent holes; a crude gas outlet (12) is formed in the upper part of the vertical furnace body (2), the crude gas outlet (12) is connected with an inlet of a dust removal device (4), a gas outlet of the dust removal device (4) is connected with a combustible gas outlet pipe (13), a solid outlet of the dust removal device (4) is communicated with the middle part of the vertical furnace body (2), and the dust removal device (4) and the vertical furnace body (2) are integrally arranged; one side of the bottom of the vertical furnace body (2) is provided with an air inlet (17), and the other side is provided with an ash outlet (19); the gasified gas circulating device (5) is arranged outside the vertical furnace body (2), an inlet at the upper end of the gasified gas circulating device (5) is communicated with the inside of the vertical furnace body (2), and an inlet at the lower end of the gasified gas circulating device (5) is communicated with the air inlet (17);
the gasification gas circulating device (5) comprises a circulating pipe (14), a one-way valve (15) capable of realizing stable starting of the gasification furnace is arranged on the circulating pipe (14), the circulating pipe (14) is connected with the outer wall of the vertical furnace body (2), an inlet at the upper end of the circulating pipe (14) is communicated with the inside of the vertical furnace body (2), and an inlet at the lower end of the circulating pipe (14) is communicated with an air inlet (17).
2. The combined partial-circulation biomass gasifier according to claim 1, characterized in that the feeding system (3) comprises a feeding hopper (6), a hydraulic feeding device (7) and a feeding plate (8), the feeding hopper (6) is arranged above the feeding section (9), the hydraulic feeding device (7) and the feeding plate (8) are arranged in the feeding section (9), and the hydraulic feeding device (7) is connected with the feeding plate (8).
3. The combined partial circulation biomass gasification furnace according to claim 1, characterized in that the length of the feeding section (9) is 1/3 of the horizontal furnace body (1), and the length of the drying-gasification section (10) is 2/3 of the horizontal furnace body (1).
4. The combined partial circulation biomass gasification furnace according to claim 1, characterized in that the dust removal device (4) is a cyclone dust removal device.
5. The combined type biomass gasification furnace with partial circulation according to claim 1, characterized in that the outer wall of the gasification gas circulation device (5) and the outer walls of the middle and upper parts of the vertical furnace body (2) are provided with heat insulation layers (18).
6. The combined type partial circulation biomass gasification furnace according to claim 1, wherein a slope (20) is provided between the air inlet (17) and the ash outlet (19), and the height of the slope (20) on the side of the air inlet (17) is larger than the height of the slope (20) on the side of the ash outlet (19).
7. The method for operating a combined partial circulation biomass gasifier according to any one of claims 1 to 6, comprising:
after the interior of the vertical furnace body (2) is ignited, air is introduced into the air inlet (17), biomass raw materials enter the drying-gasifying section (10) from the feeding section (9) of the horizontal furnace body (1) through the feeding system (3), and are subjected to primary gasification reaction after being dried, and are volatilized and analyzed; under the action of the feeding system (3), biomass raw materials which are not completely gasified enter the middle part of the vertical furnace body (2) to be subjected to pyrolysis gasification reaction to generate high-temperature combustible gas and tar, and biomass residues are discharged from the ash outlet (19); part of high-temperature combustible gas ascends through the vent holes (11) and flows through the biomass raw material in the drying-gasification section (10) to provide heat for drying and primary gasification of the biomass raw material, the temperature of the high-temperature combustible gas is reduced while the high-temperature combustible gas releases heat, tar is condensed and separated out and adsorbed on the biomass raw material, and the adsorbed tar enters the vertical furnace body (2) along with the biomass material and is combusted and decomposed at high temperature to release heat; the combustible gas continuously goes upward to enter the dust removal device (4) through the crude gas outlet (12) for dust removal and then is led out through the combustible gas outlet pipe (13), and biomass debris obtained by the dust removal device (4) is collected and then sent into the vertical furnace body (2) for combustion and utilization; the other part of high-temperature combustible gas is introduced to the air inlet (17) through the gasification gas circulating device (5), is mixed with the inlet air and then is sent to the vertical furnace body (2) again for combustion, and releases heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010521.7A CN112111301B (en) | 2020-09-23 | 2020-09-23 | Combined type partial circulation biomass gasification furnace and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010521.7A CN112111301B (en) | 2020-09-23 | 2020-09-23 | Combined type partial circulation biomass gasification furnace and working method thereof |
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| JP2004212032A (en) * | 2002-11-15 | 2004-07-29 | Ebara Corp | Fluidized bed gasification furnace |
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