CN109628160B - High-humidity biomass gasification method and system - Google Patents
High-humidity biomass gasification method and system Download PDFInfo
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- CN109628160B CN109628160B CN201910094291.8A CN201910094291A CN109628160B CN 109628160 B CN109628160 B CN 109628160B CN 201910094291 A CN201910094291 A CN 201910094291A CN 109628160 B CN109628160 B CN 109628160B
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- 238000002309 gasification Methods 0.000 title claims abstract description 51
- 239000002028 Biomass Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000007789 gas Substances 0.000 claims abstract description 70
- 238000001816 cooling Methods 0.000 claims abstract description 69
- 238000005406 washing Methods 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 18
- 239000002737 fuel gas Substances 0.000 claims abstract description 18
- 239000010865 sewage Substances 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000000498 cooling water Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 239000003995 emulsifying agent Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 6
- 238000000746 purification Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 description 3
- 230000009969 flowable effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004523 catalytic cracking Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004227 thermal cracking Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000010921 garden waste Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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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
- C10J3/72—Other features
-
- 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
-
- 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
- C10J2300/0903—Feed preparation
- C10J2300/0909—Drying
-
- 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
-
- 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
- C10J2300/12—Heating the gasifier
- C10J2300/1223—Heating the gasifier by burners
-
- 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
- C10J2300/18—Details of the gasification process, e.g. loops, autothermal operation
- C10J2300/1807—Recycle loops, e.g. gas, solids, heating medium, water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Industrial Gases (AREA)
Abstract
The invention discloses a high-humidity biomass gasification method and a high-humidity biomass gasification system. The method comprises the following steps: (1) Crude gas from the outlet of the gasification furnace enters a cooling washing tower to obtain clean gas; (2) The tar sewage discharged from the cooling washing tower enters an oil-water separator, the oil-water separator separates the tar sewage into light tar at the upper layer, heavy tar at the lower layer and an intermediate water layer, the intermediate water layer enters the cooling washing tower again to spray and purify the crude gas to form a purification cycle, (3) the light tar and the heavy tar in the oil collecting tank are uniformly mixed and then are sprayed into a burner to burn together with the introduced clean gas, high-temperature flue gas is obtained while the tar is eliminated, the high-temperature flue gas is utilized to dry the high-humidity biomass, and the dried biomass enters a gasification furnace to generate the crude gas through gasification reaction. According to the invention, tar is separated from sewage and then sprayed into the combustor to burn together with the introduced clean fuel gas, the obtained high-temperature flue gas is used for drying the high-humidity biomass raw material, and tar energy is recovered, the system efficiency is improved while tar sewage treatment is completed, and the method is simple, effective, energy-saving and environment-friendly.
Description
Technical field:
the invention belongs to the technical field of biomass thermochemical conversion, and particularly relates to a high-humidity biomass gasification method and system.
The background technology is as follows:
Biomass gasification is the conversion of biomass fuel into a fuel gas containing hydrogen, carbon monoxide and methane. The fuel gas produced by biomass gasification can be used for centralized gas supply, heat supply, power generation, synthesis of liquid fuel or chemicals and the like, and has wide development and application prospects.
Biomass raw materials such as straw, garden waste and the like are high in water content generally, and a large amount of energy is consumed for drying before gasification and utilization; on the other hand, the tar problem is the bottleneck for limiting the popularization and application of the gasification technology, and the tar not only seriously affects the quality of the fuel gas, but also causes corrosion and blockage problems on downstream fuel gas storage, transportation and utilization equipment, and affects the operation and safety of the system. Common tar removal methods include water washing, filtration, thermal cracking, and catalytic cracking. The water washing spray oil is simple and effective, but a large amount of tar wastewater is generated; the oil spraying efficiency by the filtering method is low and the cost is high; the thermal cracking is generally carried out at a high temperature of more than 1000 ℃, the equipment requirement is high, and the energy consumption is high; catalytic cracking reduces the tar cracking reaction temperature and improves the tar conversion efficiency, but the problem of carbon deposit or sintering of the catalyst is difficult to solve.
The invention comprises the following steps:
The invention aims to provide a high-humidity biomass gasification method and system, which can recover tar energy, reduce drying energy consumption and solve the problem of difficult tar treatment.
A first object of the present invention is to provide a high humidity biomass gasification process comprising the steps of:
(1) Crude gas from the outlet of the gasification furnace enters a cooling washing tower to obtain clean gas;
(2) The tar sewage discharged by the cooling washing tower enters an oil-water separator, the oil-water separator separates the tar sewage into light tar at the upper layer, heavy tar at the lower layer and an intermediate water layer, the intermediate water layer enters the cooling washing tower again to spray and purify the crude gas, so that crude gas purification circulation is formed, and the light tar and the heavy tar enter an oil collecting tank;
(3) The light tar and the heavy tar in the oil collecting tank are uniformly mixed and then are sprayed into the combustor to burn together with the introduced clean fuel gas, high-temperature flue gas is obtained while tar is eliminated, the high-temperature flue gas is utilized to dry the high-humidity biomass, and the dried biomass enters the gasification furnace to generate coarse fuel gas through gasification reaction.
Preferably, the cooling scrubber in step (1) comprises a first cooling scrubber and a second cooling scrubber connected in sequence. The cooling washing tower is used for cooling and removing spray oil, and the first cooling washing tower and the second cooling washing tower are arranged for improving the purifying effect.
Preferably, the oil-water separator in the step (2) is provided with an air floatation generating device for assisting the separation of the light tar, and the light tar is separated to an upper layer.
Preferably, in the oil-water separator in the step (2), part of the sewage of the middle water layer is discharged to an oil collecting tank together with the light tar and the heavy tar, so that the total amount of the sewage circulated between the cooling washing tower and the oil-water separator is kept unchanged, and the water is not needed to be supplemented.
Preferably, in step (2) the light tar and the heavy tar in the sump tank are homogeneously mixed and kept well flowable by heating, stirring and/or adding an emulsifier.
Preferably, the oil collecting tank in the step (2) is heated by using the drying tail gas in the step (3).
Preferably, the clean gas flow to the burner is adjusted based on the heat required to dry the high moisture biomass and heat the header tank.
According to the invention, tar is sprayed into the burner to burn together with the introduced clean fuel gas, high-temperature flue gas is obtained while tar sewage treatment is completed, the high-temperature flue gas is utilized to dry the high-humidity biomass raw material, the energy of the tar is recovered to reduce the drying energy consumption, and meanwhile, the treatment difficulty of the tar sewage is solved, and the method is simple, effective, energy-saving and environment-friendly.
The second object of the invention is to provide a high-humidity biomass gasification system, which is used for realizing a high-humidity biomass gasification method and comprises a gasification furnace, a cooling washing tower, an oil-water separator, an oil collecting tank, a burner and a dryer, wherein a crude gas outlet is arranged on the gasification furnace, tar-containing crude gas in the gasification furnace enters the cooling washing tower from the crude gas outlet through a crude gas pipeline, the cooling washing tower realizes indirect cooling of the cooling washing tower through circulating cooling water, the bottom of the cooling washing tower is communicated with the oil-water separator, tar waste liquid discharged by the cooling washing tower flows into the oil-water separator, the tar waste liquid is separated into light tar, heavy tar and an intermediate water layer, the intermediate water layer enters the cooling washing tower again through a water conveying pipeline to wash and purify the tar-containing crude gas, the light tar and the heavy tar enter the oil collecting tank, the light tar and the heavy tar are sprayed into the burner to burn together with the introduced crude gas after being uniformly mixed, high-temperature flue gas is obtained while tar is eliminated, the high-temperature flue gas is utilized to dry the high-humidity biomass in the dryer, and the dried biomass enters the gasification furnace to react to generate crude gas.
Preferably, the cooling washing tower pipe side be provided with crude gas and shower water, the shell side is provided with circulating cooling water.
Preferably, the cooling washing tower is provided with a crude gas inlet, a clean gas outlet, a circulating cooling water inlet and a circulating cooling water outlet, one end of the crude gas pipeline is communicated with the crude gas outlet, the other end of the crude gas pipeline is communicated with the crude gas inlet of the cooling washing tower, the clean gas outlet conveys part of clean gas in the cooling washing tower to the burner, and the clean gas is combusted together after being uniformly mixed with light tar and heavy tar in the oil collecting tank, and the other part of clean gas is stored for standby.
Preferably, the water delivery pipeline is provided with a cooler, and the intermediate water layer enters the cooling washing tower for atomization spraying after being cooled by the cooler.
The beneficial effects of the invention are as follows: the tar is separated out and sprayed into a combustor to burn together with the introduced clean fuel gas, the high-temperature flue gas is utilized to dry the high-humidity biomass raw material, the tar energy is recovered, and meanwhile, the treatment difficulty of tar sewage is solved, and the method is simple, effective, energy-saving and environment-friendly.
Description of the drawings:
FIG. 1 is a schematic illustration of a process flow for example 1 of the high moisture biomass gasification process of the present invention;
Reference numerals illustrate: 1. a gasification furnace; 2. crude gas; 3. cooling the washing tower; 4. circulating cooling water; 5. clean fuel gas; 6. tar sewage; 7. an oil-water separator; 8. light tar; 9. an intermediate aqueous layer; 10. heavy tar; 11. an oil collecting tank; 12. a burner; 13. a dryer; 14. high-humidity biomass; 15. drying tail gas; 16. dry biomass; 17. gasifying the medium.
The specific embodiment is as follows:
the following examples are further illustrative of the invention and are not intended to be limiting thereof.
The equipment and materials mentioned in this invention are commercially available, unless otherwise specified.
Example 1:
as shown in fig. 1, a high-humidity biomass gasification method includes the steps of:
(1) The crude gas 2 from the outlet of the gasification furnace 1 enters a cooling washing tower 3, tar is removed by washing, and is indirectly cooled by circulating cooling water 4 to obtain clean gas 5;
(2) The tar sewage 6 discharged from the cooling washing tower 3 enters an oil-water separator 7, the oil-water separator 7 separates the tar sewage into upper light tar 8, an intermediate water layer 9 and lower heavy tar 10, the intermediate water layer 9 enters the cooling washing tower 3 again to spray and purify the crude gas 2, circulation is formed, and the upper light tar 8 and the lower heavy tar 10 enter an oil collecting tank 11;
(3) The light tar 8 and the heavy tar 10 are mixed and stirred in the oil collecting tank 11, then are sprayed into the combustor 12 to burn together with the introduced clean fuel gas 5, high-temperature flue gas is obtained while the sprayed fuel water is eliminated, the high-temperature flue gas is utilized to dry the high-humidity biomass 14 in the dryer 13, the dry tail gas 15 is used for heating the oil collecting tank 11, the temperature of the tar mixture is maintained at about 80 ℃, the light tar and the heavy tar are uniformly mixed, good fluidity is obtained, and the dry biomass 16 enters the gasification furnace 1 to react with the gasification medium 17 to generate the coarse fuel gas 2.
In step (2) the light tar 8 and the heavy tar 10 in the oil collecting tank 11 can be homogeneously mixed and kept well flowable by heating, stirring and/or adding an emulsifier, in this embodiment the light tar 8 and the heavy tar 10 in the oil collecting tank 11 are homogeneously mixed and kept well flowable by stirring.
The cooling washing towers 3 can be arranged as a plurality of cooling washing towers 3 which are connected in sequence, the crude fuel gas passing through the cooling washing towers 3 is purified into clean fuel gas, and the quantity of the cooling washing towers 3 is determined according to actual conditions. In this embodiment, the number of cooling towers 3 is 1. The cooling washing tower 3 is provided with crude gas and spray water on the pipe side, and circulating cooling water on the shell side.
The system for realizing the high-humidity biomass gasification method comprises a gasification furnace 1, a cooling washing tower 3, an oil-water separator 7, an oil collecting tank 11, a combustor 12 and a dryer 13, wherein a crude gas outlet is formed in the gasification furnace 1, tar-containing crude gas 2 in the gasification furnace 1 enters the cooling washing tower 3 from the crude gas outlet through a crude gas pipeline, crude gas and spray water are arranged on the pipe side of the cooling washing tower 3, circulating cooling water is arranged on the shell side of the cooling washing tower 3, a crude gas inlet, a clean gas outlet, a circulating cooling water inlet and a circulating cooling water outlet are formed in the cooling washing tower 3, one end of the crude gas pipeline is communicated with the crude gas outlet, the other end of the crude gas pipeline is communicated with the crude gas inlet of the cooling washing tower 3, a part of clean gas in the cooling washing tower 3 is conveyed to the combustor 12 and is uniformly mixed with light tar 8 and heavy tar 10 in the oil collecting tank 11 for combustion, and the other part of clean gas is stored for standby. In the present embodiment, the oil-water separator 7 is provided with an air flotation generating means (not shown) that assists in the separation of the light tar 8.
The cooling washing tower 3 is indirectly cooled through circulating cooling water, the bottom of the cooling washing tower 3 is communicated with the oil-water separator 7, tar waste liquid discharged from the cooling washing tower 3 flows into the oil-water separator 7, the tar waste liquid is separated into light tar 8, heavy tar 10 and an intermediate water layer 9, the intermediate water layer 9 enters the cooling washing tower 3 again through a water conveying pipeline to wash and purify tar-containing crude gas, the light tar 8 and the heavy tar 10 enter an oil collecting tank 11, after being uniformly mixed, the light tar 8 and the heavy tar 10 are sprayed into a combustor 12 to be combusted together with the introduced clean gas 5, high-temperature flue gas is obtained while tar is eliminated, the high-temperature flue gas is utilized to dry high-humidity biomass 14 in a dryer 13, and the dried biomass enters a gasification furnace 1 to generate a gasification reaction to generate crude gas 2. The water delivery pipeline is provided with a cooler, and the intermediate water layer 9 enters the cooling washing tower 3 for atomization spraying after being cooled by the cooler.
In this embodiment, the gasification furnace 1 is an updraft fixed bed gasification furnace, which has low requirement on the water content of the raw material and is beneficial to the stable operation of the system. And (2) adjusting Jiao Youwu water injected into the combustor 13 to ensure that the circulating water between the cooling washing tower 3 and the oil-water separator 7 is kept unchanged without supplementing water. And step (3) adjusting the flow rate of clean fuel gas 5 to the burner 13 according to the heat required for drying the high-humidity biomass 14 and heating the oil collecting tank 11.
The tar content of the crude gas 2 depends on the type and the operation condition of the gasifier, generally 0.1-100g/m 3, the heat value of the tar is about 40MJ/kg, and the energy content of the light tar 8 and the heavy tar 10 can be up to about 20% of the energy content of the dry biomass 14.
Comparative example 1:
The same as in example 1, except that: the fuel gas obtained by gasification is utilized to dry the high-humidity biomass raw material, the tar waste liquid is treated by conventional means such as downstream oxidative digestion, biochemical treatment and the like, the initial investment is large, the operation cost is high, and all tar energy is lost.
Compared with the comparative example 1, the embodiment 1 recovers tar energy, improves gasification efficiency by about 20%, has simple process and system, solves the problem of tar sewage treatment, and greatly reduces cost.
The above description of the method and system for gasifying high-humidity biomass provided by the present invention is merely for aiding in understanding the technical solution of the present invention and its core concept, and it should be pointed out that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.
Claims (1)
1. The high-humidity biomass gasification method is characterized in that a high-humidity biomass gasification system is used for realizing the high-humidity biomass gasification method and comprises a gasification furnace, a cooling washing tower, an oil-water separator, an oil collecting tank, a combustor and a dryer, wherein a crude gas outlet is formed in the gasification furnace, tar-containing crude gas in the gasification furnace enters the cooling washing tower from the crude gas outlet through a crude gas pipeline, the cooling washing tower realizes indirect cooling of the cooling washing tower through circulating cooling water, the bottom of the cooling washing tower is communicated with the oil-water separator, tar waste liquid discharged by the cooling washing tower flows into the oil-water separator, the tar waste liquid is separated into light tar, heavy tar and an intermediate water layer, the intermediate water layer enters the cooling washing tower again through a water conveying pipeline to wash and purify the tar-containing crude gas, the light tar and the heavy tar enter the oil collecting tank, the light tar and the heavy tar are sprayed into the combustor to burn together with the introduced clean gas after being uniformly mixed, high-temperature flue gas is obtained while tar is eliminated, the high-temperature flue gas is utilized in the dryer to dry the high-humidity biomass, and the tar waste liquid enters the gasification furnace to perform gasification reaction to generate crude gas; the shell side of the cooling washing tower is provided with a crude gas inlet, a spray water inlet, a clean gas outlet, a circulating cooling water inlet and a circulating cooling water outlet, one end of the crude gas pipeline is communicated with the crude gas outlet, the other end of the crude gas pipeline is communicated with the crude gas inlet of the cooling washing tower, the clean gas outlet conveys a part of clean gas in the cooling washing tower to a burner, the clean gas is uniformly mixed with light tar and heavy tar in an oil collecting tank and then combusted, the other part of clean gas is stored for standby, a cooler is arranged on the water conveying pipeline, and the intermediate water layer enters the cooling washing tower for atomization spraying after being cooled by the cooler;
the high-humidity biomass gasification method comprises the following steps:
(1) The crude gas from the gasification furnace outlet enters a cooling washing tower to obtain clean gas, and the cooling washing tower comprises a first cooling washing tower and a second cooling washing tower which are sequentially connected;
(2) The tar sewage discharged from the cooling washing tower enters an oil-water separator, the oil-water separator separates the tar sewage into light tar at the upper layer, heavy tar at the lower layer and an intermediate water layer, the intermediate water layer enters the cooling washing tower again to spray and purify crude gas to form circulation, the light tar and the heavy tar enter an oil collecting tank, the oil-water separator is provided with an air floatation generating device for assisting the separation of the light tar, the intermediate water layer enters the cooling washing tower to spray in an atomizing way after being cooled by the cooler, and the light tar and the heavy tar in the oil collecting tank are uniformly mixed and kept with good fluidity through heating, stirring and/or adding an emulsifying agent;
(3) And (3) uniformly mixing the light tar and the heavy tar in the oil collecting tank, spraying the mixture into a combustor, burning the mixture with the introduced clean fuel gas, simultaneously obtaining high-temperature flue gas while eliminating the tar, drying the high-humidity biomass by using the high-temperature flue gas, enabling the dried biomass to enter a gasification furnace for gasification reaction to generate crude fuel gas, and heating the oil collecting tank in the step (2) by using drying tail gas.
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| JPS60195184A (en) * | 1984-03-19 | 1985-10-03 | Hitachi Ltd | Upgrading of low-grade coal |
| CN101402869A (en) * | 2008-11-19 | 2009-04-08 | 中煤能源黑龙江煤化工有限公司 | Liquefaction state destructive distillation oil refining process for shale and produced shale oil thereof |
| CN102380276A (en) * | 2011-09-05 | 2012-03-21 | 南京林业大学 | Gas-solid-liquid separation and purification system for agricultural and forestry biomass material gasified gas |
| CN104479761A (en) * | 2014-11-28 | 2015-04-01 | 新奥科技发展有限公司 | Washing tower and coal gas purification and dust removal system with washing tower |
| CN104449793A (en) * | 2014-12-11 | 2015-03-25 | 广州迪森热能技术股份有限公司 | Biomass liquefaction system |
| CN209555166U (en) * | 2019-01-30 | 2019-10-29 | 中国科学院广州能源研究所 | A kind of high humidity biomass gasification system |
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