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Low-tar double-bed gasifying method and device

A gasification device and low-tar technology, applied in fixed-bed gasification, gasification process, chemical modification of combustible gas, etc., can solve the problems of low tar content, high tar content, insufficient clean energy utilization rate, etc., and achieve gas The effect of high chemical strength, reducing tar content, and avoiding catalyst sintering failure

Inactive Publication Date: 2018-05-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high tar content, insufficient cleanliness and low energy utilization rate in the gasification process existing in the current gasifier, the present invention proposes a double bed with fluidized bed and fixed bed, strong raw material adaptability and low tar content Gasification method and device

Method used

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  • Low-tar double-bed gasifying method and device

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Effect test

Embodiment 1

[0035] Biomass particles enter the fluidized bed gasifier 1 and undergo a series of chemical reactions with the gasification agent. The gasification temperature is about 600°C. The initial gasification product enters the dilute phase zone 102 and first reacts with the catalyst injected into the bed Catalytic reaction, tar catalytic cracking, concentration reduction, catalytic cracking reaction temperature of about 750 ° C, and then oxidative combustion reaction with the oxidant passed through the upper part, forming a high temperature zone, about 1050 ° C. At this time, the gasified slag enters the fixed bed 4 through the slag discharge pipe 2, and the gasification gas carrying fly ash particles passes through the primary cyclone separator 9 and the secondary cyclone separator 8 to realize gas-solid separation. The carbon residue particles enter the fixed bed 4 through the first-stage feeder 11 and the second-stage feeder 6, and form a catalytic bed together with the slag. The...

Embodiment 2

[0037] Biomass particles enter the fluidized bed gasification furnace 1 and undergo a series of chemical reactions with the gasification agent. The gasification temperature is about 750°C. Catalytic reaction, tar catalytic cracking, concentration reduction, catalytic cracking reaction temperature is about 700 ° C, and then oxidative combustion reaction with the oxidant passed through the upper part, forming a high temperature zone, about 950 ° C. At this time, the gasified slag enters the fixed bed 4 through the slag discharge pipe 2, and the gasification gas carrying fly ash particles passes through the primary cyclone separator 9 and the secondary cyclone separator 8 to realize gas-solid separation. The carbon residue particles enter the fixed bed 4 through the first-stage feeder 11 and the second-stage feeder 6, and form a catalytic bed together with the slag. The combustible gas from the cyclone separator enters the upper part of the fixed bed, reforms with the water vapor...

Embodiment 3

[0039] The biomass particles enter the fluidized bed gasifier 1 and undergo a series of chemical reactions with the gasification agent. The gasification temperature is about 700°C. Catalytic reaction, tar catalytic cracking, concentration reduction, catalytic cracking reaction temperature is about 850 ° C, and then oxidative combustion reaction occurs with the oxidant passed through the upper part, forming a high temperature zone, about 1200 ° C. At this time, the gasified slag enters the fixed bed 4 through the slag discharge pipe 2, and the gasification gas carrying fly ash particles passes through the primary cyclone separator 9 and the secondary cyclone separator 8 to realize gas-solid separation. The carbon residue particles enter the fixed bed 4 through the first-stage feeder 11 and the second-stage feeder 6, and form a catalytic bed together with the slag. The combustible gas from the cyclone separator enters the upper part of the fixed bed, reforms with the water vapor...

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Abstract

The invention discloses a low-tar double-bed gasifying method and a low-tar double-bed gasifying device. The low-tar double-bed gasifying device comprises a fluidized bed, a fixed bed, a primary cyclone separator, a secondary cyclone separator and a material returning device, wherein oxidant inlets and catalyst jetting orifices are formed in the upper space of a lean-phase zone of the fluidized bed. After biomass enters a fluidized bed gasifier and is gasified, a gasified product sequentially passes through a catalytic cracking section and an oxygen-enriched combustion section, so that the tarcontent of the gasified product can be effectively reduced and the fuel gas quality can be improved. Gas-solid separation is performed on reacted gas through the primary cyclone separator and the secondary cyclone separator, a solid product returns to the fixed bed through two returns to form a fixed catalytic bed layer, a gas product enters the upper space of the fixed bed and passes through thecatalytic bed layer, a tar component in the gas product is catalytically cracked, and finally combustible gas is produced after a secondary gasification reaction. The produced gas product is low in tar content and high in quality after multiple reactions; the low-tar double-bed gasifying device is strong in adaptability to raw materials, small in floor area and compact in structure, and the raw material utilization rate is high.

Description

technical field [0001] The invention relates to a low-tar double-bed gasification method and device, and belongs to the field of energy clean utilization including biomass gasification including sludge gasification. Background technique [0002] In recent years, with the rapid development of my country's social economy and the acceleration of urbanization, and the gradual advancement of my country's energy supply-side structural reform, the rural energy structure is also undergoing major changes, from traditional energy structure to emerging energy change. The substantial increase in the popularity of gas in rural areas has led to a precipitous decline in the utilization rate of straw and other biomass, resulting in the unfavorable situation of random stacking and mass incineration of straw. In the case of increasingly scarce energy and higher environmental requirements, this phenomenon not only causes a lot of waste of energy, but also seriously pollutes the environment. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/02C10J3/20C10J3/54C10J3/56C10J3/72C10J3/84C10K3/00C10K3/02
CPCC10J3/02C10J3/20C10J3/54C10J3/56C10J3/721C10J3/84C10J2300/0916C10J2300/0983C10J2300/0986C10J2300/1603C10J2300/1625C10K3/005C10K3/006C10K3/008C10K3/023
Inventor 梁财王延涛胡驾纬周群陈晓平吴新马吉亮刘道银
Owner SOUTHEAST UNIV
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