CN109628148B - Biomass gasification system and working process thereof - Google Patents
Biomass gasification system and working process thereof Download PDFInfo
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- CN109628148B CN109628148B CN201811601827.2A CN201811601827A CN109628148B CN 109628148 B CN109628148 B CN 109628148B CN 201811601827 A CN201811601827 A CN 201811601827A CN 109628148 B CN109628148 B CN 109628148B
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- 238000002309 gasification Methods 0.000 title claims abstract description 78
- 239000002028 Biomass Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title abstract description 10
- 239000000725 suspension Substances 0.000 claims abstract description 146
- 239000000428 dust Substances 0.000 claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003546 flue gas Substances 0.000 claims abstract description 10
- 239000000779 smoke Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005243 fluidization Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000011269 tar Substances 0.000 description 12
- 238000004939 coking Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002916 wood waste Substances 0.000 description 1
Classifications
-
- 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
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—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
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
Landscapes
- 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 biomass gasification system and a working process thereof, wherein the biomass gasification system comprises a biomass gasification furnace, a primary cyclone separator, a secondary cyclone dust collector, a multi-stage suspension preheater, an L-shaped connecting pipe, an ash conveying pipeline, an ash cooler and a high-temperature fan which are arranged on the ground; the L-shaped connecting pipe comprises a vertical pipe and a horizontal pipe; the flue gas outlet at the top of the secondary cyclone dust collector is communicated with one side of the multi-stage suspension preheater through an L-shaped connecting pipe. The method can effectively treat tar generated after biomass gasification, and reduces the gasification gas temperature to the available working temperature of subsequent equipment of the system by using the bed material, thereby reducing energy consumption.
Description
Technical Field
The invention relates to the technical field of biomass gasification, in particular to a biomass gasification system and a working process thereof.
Background
The amount of solid biomass available in China is huge, and mainly agricultural wastes and wood wastes are used. The existing biomass gasification furnace has the problems of dust removal, coking and the like in gasification power generation.
Because biomass has the characteristics of high volatile matter and loose structure, a large amount of dust can be generated in the gasification process of biomass. And tar is generated after biomass gasification, and has corrosiveness, strong adhesiveness and thermal instability. Dust and tar can have adverse effects on equipment such as fans at the rear end of the biomass gasification system, and the equipment blocks the pipeline, so that gasification efficiency is reduced, and even the service life of the gasification furnace is influenced.
Disclosure of Invention
The invention aims to provide a biomass gasification system and a working process thereof, which aim to solve the problems of incomplete dust removal, strong coking corrosion, high equipment use and maintenance cost and short service life of a gasification furnace in gasification power generation of the existing biomass gasification furnace.
In order to achieve the above purpose, the invention adopts the following technical scheme: the biomass gasification system comprises a biomass gasification furnace 1, a primary cyclone separator 2, a secondary cyclone dust collector 3, a multi-stage suspension preheater, an L-shaped connecting pipe 4, an ash conveying pipeline 5, an ash cooler 6 and a high-temperature fan 7 which are arranged on the ground, wherein a smoke air channel is arranged at the upper part of the outer side wall of the biomass gasification furnace 1, the smoke air channel is communicated with an inlet at the upper part of the outer side wall of the primary cyclone separator 2, an outlet at the top of the primary cyclone separator 2 is communicated with an inlet of the secondary cyclone dust collector 3 through a gasification gas pipeline, and an exhaust port is arranged at the bottom of the primary cyclone separator 2 and is communicated with a collecting port at the lower part of the biomass gasification furnace 1 through a feed back pipe;
the L-shaped connecting pipe 4 comprises a vertical pipe and a horizontal pipe;
the flue gas outlet at the top of the secondary cyclone dust collector 3 is communicated with one side of a multi-stage suspension preheater through an L-shaped connecting pipe 4, and the other side of the multi-stage suspension preheater is communicated with a high-temperature fan 7; the ash cooler 6 is communicated with the multi-stage suspension preheater through an ash conveying pipeline 5.
Further, an outlet blanking pipe is arranged at the bottom of the secondary cyclone dust collector 3, and the blanking pipe is connected with an ash conveying pipeline 5.
Further, the angle between the vertical pipe and the horizontal pipe of the L-shaped connecting pipe 4 is 90 °.
Further, the multistage suspension preheater comprises at least three heat exchange units.
Further, the heat exchange units are connected in series.
Further, the multi-stage suspension preheater comprises a first stage suspension preheater 8, a second stage suspension preheater 9 and a third stage suspension preheater 10;
the gas outlet at the top of the first-stage suspension preheater 8 is communicated with the inlet at the upper part of the outer wall of the second-stage suspension preheater 9 through an L-shaped connecting pipe 4, and the outlet at the bottom of the first-stage suspension preheater 8 is communicated with the ash conveying pipeline 5 through a branch pipe;
the gas outlet at the top of the second-stage suspension preheater 9 is communicated with the inlet at the upper part of the outer wall of the third-stage suspension preheater 10 through an L-shaped connecting pipe 4; the lower part of the second-stage suspension preheater 9 is communicated with an L-shaped connecting pipe 4 between the second-stage cyclone dust collector 3 and the first-stage suspension preheater 8 through a blanking pipe;
the gas outlet at the top of the third-stage suspension preheater 10 is communicated with the high-temperature fan 7 through a pipeline; the lower part of the third-stage suspension preheater 10 is communicated with the L-shaped connecting pipe 4 between the first-stage suspension preheater 8 and the second-stage suspension preheater 9 through a blanking pipe.
Further, the first stage suspension preheater 8, the second stage suspension preheater 9 and the third stage suspension preheater 10 are identical in model number; the top surface of the second-stage suspension preheater 9 is higher than the top surface of the first-stage suspension preheater 8; the top surface of the third stage suspension preheater 10 is higher than the top surface of the second stage suspension preheater 9.
Further, the gasification gas pipeline is horizontally arranged.
The invention also provides a working process of the biomass gasification system, which comprises the following steps:
step one, biomass raw materials enter a biomass gasification furnace 1 through a feeding system to be gasified, and then high-temperature dust-containing gasification gas is generated;
step two, dust removal is carried out once, and dust-containing gasified gas enters a primary cyclone separator 2 through a smoke-wind channel at the upper part of a biomass gasifier 1 for gas-solid separation; the separated solid particles return to the lower part of the biomass gasification furnace 1 to continue to participate in gasification, and on the other hand, the solid particles are used as bed materials to adjust the bed pressure and temperature and keep fluidization;
step three, secondary dust removal, wherein the separated high-temperature dust-containing gasified gas enters a secondary cyclone dust remover 3 through a flue gas outlet of the primary cyclone separator 2;
and step four, cooling the multistage suspension preheater.
Further, in step four, the multistage suspension preheater comprises a three-stage suspension preheater; the temperature reduction process is as follows:
s1, an outlet of a smoke air channel at the upper part of a secondary cyclone dust collector 3 is connected with a first-stage suspension preheater 8 in a multi-stage suspension preheater, a vertical pipe of an L-shaped connecting pipe 4 is communicated with a gas outlet at the top of the first-stage suspension preheater 8, a horizontal pipe is communicated with an inlet at the upper part of the outer wall of a second-stage suspension preheater 9, and an outlet at the bottom of the first-stage suspension preheater 8 is communicated with an ash conveying pipeline 5 through a branch pipe to receive ash which has absorbed tar and cool the ash;
s2, mixing ash and bed materials of the second-stage suspension preheater 9 with gasification gas to be fed into the first-stage suspension preheater 8, and completing heat exchange in a vertical pipe and a horizontal pipe of the L-shaped connecting pipe 4;
s3, an outlet of a smoke channel at the upper part of the second-stage suspension preheater 9 is communicated with the third-stage suspension preheater 10 through an L-shaped connecting pipe 4, in particular, a vertical pipe is communicated with a gas outlet at the top of the second-stage suspension preheater 9, and a horizontal pipe is communicated with an inlet at the upper part of the outer wall of the third-stage suspension preheater 10;
s4, the outlet of the upper smoke channel of the third-stage suspension preheater 10 and the high-temperature fan 7 are fed into subsequent equipment of the biomass gasification system.
The beneficial effects of the invention are as follows:
1, the invention provides a biomass gasification system and a working process thereof, and the arrangement is ingenious. After biomass gasification, the biomass passes through a primary cyclone separator, a secondary cyclone dust collector and a multi-stage suspension preheater, and is carried with tar in the subsequent gasifying gas through inert bed materials and dust, so that the purpose of removing tar is achieved, and subsequent equipment and pipelines of the system are protected.
2, the multistage suspension preheater in the biomass gasification system can utilize the gas-solid mixing stronger heat exchange coefficient of the heat exchange unit, and utilize the low-temperature inert bed material to cool the high-temperature flue gas in a shorter distance, so that the waste heat can be more fully utilized under the condition that the temperature of the gasified gas reaches the inlet requirement of the high-temperature fan.
3, tar generated after biomass gasification can be effectively treated, and the temperature of gasification gas is reduced to the available working temperature of subsequent equipment of the system by using bed materials, so that energy consumption is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The main objects and other advantages of the invention may be realized and attained by means of the instrumentalities and particularly pointed out in the specification and claims.
Drawings
The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a biomass gasification system according to the present invention.
Reference numerals: 1-biomass gasification furnace, 2-first-stage cyclone separator, 3-second-stage cyclone dust collector, 4-L connecting pipe, 5-ash conveying pipeline, 6-ash cooler, 7-high temperature fan, 8-first-stage suspension preheater, 9-second-stage suspension preheater and 10-third-stage suspension preheater.
Detailed Description
The following examples are given by way of illustration only and are not to be construed as limiting the scope of the invention.
The invention provides a biomass gasification system, which comprises a biomass gasification furnace 1, a primary cyclone separator 2, a secondary cyclone dust collector 3, a multi-stage suspension preheater, an L-shaped connecting pipe 4, an ash conveying pipeline 5, an ash cooler 6 and a high-temperature fan 7, wherein the biomass gasification furnace 1, the primary cyclone separator 2, the secondary cyclone dust collector 3 and the multi-stage suspension preheater are arranged on the ground, and the L-shaped connecting pipe 4 comprises a vertical pipe and a horizontal pipe; the angle between the vertical pipe and the horizontal pipe of the L-shaped connecting pipe 4 is 90 degrees.
The biomass gasification furnace 1 is used for gasifying biomass fuel with small density and loose structure into gasification gas. The upper part of the outer side wall of the biomass gasification furnace 1 is provided with a smoke channel, the smoke channel is communicated with an inlet at the upper part of the outer side wall of the primary cyclone separator 2, an outlet at the top of the primary cyclone separator 2 is communicated with an inlet of the secondary cyclone dust collector 3 through a gasification gas pipeline, the bottom of the primary cyclone separator 2 is provided with a discharge outlet, and the discharge outlet is communicated with a collecting port at the lower part of the biomass gasification furnace 1 through a feed back pipe; the flue gas outlet at the top of the secondary cyclone dust collector 3 is communicated with a vertical pipe of the L-shaped connecting pipe 4, the horizontal pipe of the L-shaped connecting pipe 4 is communicated with one side of a multi-stage suspension preheater, and the other side of the multi-stage suspension preheater is communicated with a high-temperature fan 7; the ash cooler 6 is communicated with the multi-stage suspension preheater through an ash conveying pipeline 5. Wherein the gasification gas pipeline is horizontally arranged.
Wherein the multistage suspension preheater may comprise at least three heat exchange units. The heat exchange units are connected in series. The multi-stage suspension preheater comprises a first stage suspension preheater 8, a second stage suspension preheater 9 and a third stage suspension preheater 10; the first-stage suspension preheater 8, the second-stage suspension preheater 9 and the third-stage suspension preheater 10 are the same in model number; the top surface of the second-stage suspension preheater 9 is higher than the top surface of the first-stage suspension preheater 8; the top surface of the third stage suspension preheater 10 is higher than the top surface of the second stage suspension preheater 9. Each first-stage suspension preheater 8 is connected in series with a discharge port pipe through a feed port pipe, and the third-stage suspension preheaters 10 are arranged in a layered manner sequentially from top to bottom in space.
The gas outlet at the top of the first-stage suspension preheater 8 is communicated with the inlet at the upper part of the outer wall of the second-stage suspension preheater 9 through an L-shaped connecting pipe 4, and the outlet at the bottom of the first-stage suspension preheater 8 is communicated with the ash conveying pipeline 5 through a branch pipe. Specifically, the vertical pipe of the L-shaped connecting pipe 4 is communicated with a gas outlet at the top of the first-stage suspension preheater 8, and the horizontal pipe is communicated with an inlet at the upper part of the outer wall of the second-stage suspension preheater 9.
The gas outlet at the top of the second-stage suspension preheater 9 is communicated with the inlet at the upper part of the outer wall of the third-stage suspension preheater 10 through an L-shaped connecting pipe 4; the lower part of the second-stage suspension preheater 9 is communicated with an L-shaped connecting pipe 4 between the second-stage cyclone dust collector 3 and the first-stage suspension preheater 8 through a blanking pipe; the gas outlet at the top of the third-stage suspension preheater 10 is communicated with the high-temperature fan 7 through a pipeline; the lower part of the third-stage suspension preheater 10 is communicated with the L-shaped connecting pipe 4 between the first-stage suspension preheater 8 and the second-stage suspension preheater 9 through a blanking pipe.
After gasification, biomass passes through a primary cyclone separator 2, a secondary cyclone dust collector 3 and a multi-stage suspension preheater, the inert bed material, dust and tar in the subsequent gasified gas are carried, so that the purpose of removing tar is achieved, and subsequent equipment and pipelines of the system are protected.
The multistage suspension preheater in the biomass gasification system can utilize the gas-solid mixing stronger heat exchange coefficient of the heat exchange unit, and utilizes the low-temperature inert bed material to cool the high-temperature flue gas in a shorter distance, so that the waste heat can be more fully utilized under the condition that the temperature of the gasified gas reaches the inlet requirement of the high-temperature fan 7.
The multistage suspension preheater is combined with the biomass gasification system, so that the dust removal efficiency can be improved, and inert particles in the multistage suspension preheater are utilized to adsorb tar, so that the system stability is improved.
The working process of the biomass gasification system comprises the following steps:
step one, biomass raw materials enter a biomass gasification furnace 1 through a feeding system to be gasified, and then high-temperature dust-containing gasification gas is generated;
step two, dust removal is carried out once, and dust-containing gasified gas enters a primary cyclone separator 2 through a smoke-wind channel at the upper part of a biomass gasifier 1 for gas-solid separation; the separated solid particles return to the lower part of the biomass gasification furnace 1 to continue to participate in gasification, and on the other hand, the solid particles are used as bed materials to adjust the bed pressure and the temperature and keep fluidization.
And thirdly, secondary dust removal, wherein the separated high-temperature dust-containing gasified gas enters the secondary cyclone dust remover 3 through a flue gas outlet of the primary cyclone separator 2.
Step four, cooling the multistage suspension preheater;
s1, an outlet of an upper smoke channel of the secondary cyclone dust collector 3 is connected with a first-stage suspension preheater 8 in the multi-stage suspension preheater. The vertical pipe of the L-shaped connecting pipe 4 is communicated with a gas outlet at the top of the first-stage suspension preheater 8, and the horizontal pipe is communicated with an inlet at the upper part of the outer wall of the second-stage suspension preheater 9. The outlet at the bottom of the first stage suspension preheater 8 is communicated with the ash conveying pipeline 5 through a branch pipe. The ash which has absorbed the tar is received and cooled.
S2, mixing ash and bed materials of the second-stage suspension preheater 9 with gasification gas to be fed into the first-stage suspension preheater 8, and completing heat exchange in a vertical pipe and a horizontal pipe of the L-shaped connecting pipe 4.
S3, an outlet of a smoke channel at the upper part of the second-stage suspension preheater 9 is communicated with the third-stage suspension preheater 10 through an L-shaped connecting pipe 4, in particular, a vertical pipe is communicated with a gas outlet at the top of the second-stage suspension preheater 9, and a horizontal pipe is communicated with an inlet at the upper part of the outer wall of the third-stage suspension preheater 10.
S4, the outlet of the upper smoke channel of the third-stage suspension preheater 10 and the high-temperature fan 7 are fed into subsequent equipment of the biomass gasification system.
The invention provides a biomass gasification system which is ingenious in arrangement. After being blown out from the secondary cyclone dust collector 3, the gasified gas enters the primary suspension preheater through the inlet air pipe to perform primary heat exchange and dust removal, more than 80% of the heat transferred by each heat exchange unit is finished in the air inlet pipe, less than 20% of the heat transferred by each heat exchange unit is finished in the cyclone barrel, and the gas after heat exchange enters the next stage suspension preheater from the outlet air pipe.
The dust is separated in the primary cyclone separator 2 and the secondary cyclone dust collector 3, and the dust after gas-solid separation is connected with the ash conveying pipeline 5 through the outlet blanking pipe and then is connected to the ash cooler 6 together. The gas passing through the secondary cyclone dust collector 3 enters the secondary suspension preheater 9 through an outlet air pipe of the primary suspension preheater 8 to carry out secondary dust removal and heat exchange; the gas subjected to the secondary dust removal and heat exchange enters a third-stage suspension preheater 10 through an outlet air pipe of the second-stage suspension preheater 9; ash is collected in the ash cooler 6 by stages through branches. Simultaneously, the gasification gas temperature is reduced to the available working temperature of the subsequent equipment of the system, and the energy consumption is reduced. The inert bed material, dust and tar in the subsequent gasified gas are carried, so that the purpose of removing tar is achieved, and subsequent equipment and pipelines of the system are protected.
The foregoing is merely illustrative of preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any changes or substitutions that would occur to those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (6)
1. A biomass gasification system, characterized by: the device comprises a biomass gasification furnace (1), a primary cyclone separator (2), a secondary cyclone dust collector (3), a multi-stage suspension preheater, an L-shaped connecting pipe (4), an ash conveying pipeline (5), an ash cooler (6) and a high-temperature fan (7), wherein a smoke-wind channel is arranged at the upper part of the outer side wall of the biomass gasification furnace (1), the smoke-wind channel is communicated with an inlet at the upper part of the outer side wall of the primary cyclone separator (2), an outlet at the top of the primary cyclone separator (2) is communicated with an inlet of the secondary cyclone dust collector (3) through a gasification gas pipeline, and an exhaust port is arranged at the bottom of the primary cyclone separator (2) and is communicated with a collecting port at the lower part of the biomass gasification furnace (1) through a feed-back pipe;
the L-shaped connecting pipe (4) comprises a vertical pipe and a horizontal pipe;
the flue gas outlet at the top of the secondary cyclone dust collector (3) is communicated with one side of a multi-stage suspension preheater through an L-shaped connecting pipe (4), and the other side of the multi-stage suspension preheater is communicated with a high-temperature fan (7); the ash cooler (6) is communicated with the multistage suspension preheater through an ash conveying pipeline (5);
the bottom of the secondary cyclone dust collector (3) is provided with an outlet blanking pipe which is connected with an ash conveying pipeline (5);
the included angle between the vertical pipe and the horizontal pipe of the L-shaped connecting pipe (4) is 90 degrees;
the multistage suspension preheater comprises at least three heat exchange units;
the three heat exchange units are connected in series.
2. Biomass gasification system according to claim 1, wherein the multi-stage suspension preheater comprises a first stage suspension preheater (8), a second stage suspension preheater (9) and a third stage suspension preheater (10);
the gas outlet at the top of the first-stage suspension preheater (8) is communicated with the inlet at the upper part of the outer wall of the second-stage suspension preheater (9) through an L-shaped connecting pipe (4), and the outlet at the bottom of the first-stage suspension preheater (8) is communicated with the ash conveying pipeline (5) through a branch pipe;
the gas outlet at the top of the second-stage suspension preheater (9) is communicated with the inlet at the upper part of the outer wall of the third-stage suspension preheater (10) through an L-shaped connecting pipe (4); the lower part of the second-stage suspension preheater (9) is communicated with an L-shaped connecting pipe (4) between the second-stage cyclone dust collector (3) and the first-stage suspension preheater (8) through a blanking pipe;
the gas outlet at the top of the third-stage suspension preheater (10) is communicated with the high-temperature fan (7) through a pipeline; the lower part of the third-stage suspension preheater (10) is communicated with an L-shaped connecting pipe (4) between the first-stage suspension preheater (8) and the second-stage suspension preheater (9) through a blanking pipe.
3. Biomass gasification system according to claim 1, wherein the first stage suspension preheater (8), the second stage suspension preheater (9) and the third stage suspension preheater (10) are of the same type; the top surface of the second-stage suspension preheater (9) is higher than the top surface of the first-stage suspension preheater (8); the top surface of the third-stage suspension preheater (10) is higher than the top surface of the second-stage suspension preheater (9).
4. The biomass gasification system according to claim 1, wherein the gasification gas pipeline is horizontally disposed.
5. The operation of a biomass gasification system according to any one of claims 1 to 4, wherein the operation is:
step one, biomass raw materials enter a biomass gasification furnace (1) through a feeding system to be gasified, and then high-temperature dust-containing gasification gas is generated;
step two, dust removal is carried out once, and dust-containing gasified gas enters a primary cyclone separator (2) through a smoke wind channel at the upper part of a biomass gasifier (1) for gas-solid separation; the separated solid particles return to the lower part of the biomass gasification furnace (1) to continue to participate in gasification, and on the other hand, the solid particles are used as bed materials to adjust the bed pressure and the temperature and keep fluidization;
step three, secondary dust removal, wherein the separated high-temperature dust-containing gasified gas enters a secondary cyclone dust remover (3) through a flue gas outlet of the primary cyclone separator (2);
and step four, cooling the multistage suspension preheater.
6. The operation of the biomass gasification system according to claim 5, wherein in step four, the multistage suspension preheater comprises a three stage suspension preheater; the temperature reduction process is as follows:
s1, an outlet of a smoke air channel at the upper part of a secondary cyclone dust collector (3) is connected with a first-stage suspension preheater (8) in a multi-stage suspension preheater, a vertical pipe of an L-shaped connecting pipe (4) is communicated with a gas outlet at the top of the first-stage suspension preheater (8), a horizontal pipe is communicated with an inlet at the upper part of the outer wall of a second-stage suspension preheater (9), and an outlet at the bottom of the first-stage suspension preheater (8) is communicated with an ash conveying pipeline (5) through a branch pipe to accept ash which has absorbed tar and cool the ash;
s2, mixing ash and bed materials of the second-stage suspension preheater (9) with gasification gas to be fed into the first-stage suspension preheater (8), and completing heat exchange in a vertical pipe and a horizontal pipe of the L-shaped connecting pipe (4);
s3, communicating an upper flue gas channel outlet of the second-stage suspension preheater (9) with a third-stage suspension preheater (10) through an L-shaped connecting pipe (4), specifically communicating a vertical pipe with a gas outlet at the top of the second-stage suspension preheater (9), and communicating a horizontal pipe with an inlet at the upper part of the outer wall of the third-stage suspension preheater (10);
s4, the outlet of the upper smoke channel of the third-stage suspension preheater (10) and the high-temperature fan (7) are fed into subsequent equipment of the biomass gasification system.
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| CN101122442A (en) * | 2007-09-12 | 2008-02-13 | 刘鹤群 | Iron mineral suspended magnetic baking oven system and baking process |
| CN106701203A (en) * | 2017-01-13 | 2017-05-24 | 厦门大学 | Biomass gasification power generation waste heat recycling system based on organic Rankine cycle |
| CN209383715U (en) * | 2018-12-26 | 2019-09-13 | 北京国电龙源环保工程有限公司 | A kind of biomass gasification system |
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