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Gasification method for coproducing methane and light-weight tar

A technology for light tar and methane gas, which is used in granular/powder fuel gasification, petroleum industry, gas fuel, etc., and can solve the problems of heavy tar component proportion, low coal tar output, and low economic benefits.

Active Publication Date: 2015-09-02
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the products obtained in the existing process are all methane as the main product, while the output of coal tar with high economic added value is small, and the proportion of heavy tar components in the produced tar is relatively large. The selection, separation and processing of tar products bring a lot of inconvenience, and directly cause low economic benefits

Method used

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  • Gasification method for coproducing methane and light-weight tar
  • Gasification method for coproducing methane and light-weight tar
  • Gasification method for coproducing methane and light-weight tar

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Such as figure 2 As shown, a two-stage fluidized bed gasifier is used, and the diameter ratio of the pyrolysis section to the gasification section is 1. A certain bituminous coal enters the pyrolysis section of the gasifier through the feed port A after the catalyst loading process. After being upgraded in the pyrolysis section, it falls into the gasification section of the gasifier for gasification reaction. The high-concentration methane synthesis gas produced by the catalytic gasification section and the gas and tar produced by the pyrolysis section are discharged from the top of the gasifier, and enter the tar condensation recovery system after cyclone dust removal, and the tar in the gas is separated, and then enters the The low-temperature methanol washing section removes acid gases such as hydrogen sulfide and carbon dioxide, and then enters methane synthesis to obtain high-concentration methane gas (methane content above 96%). Among them, a small part of high-c...

Embodiment 2

[0060] Such as image 3 As shown, a two-stage gasifier is used, and the diameter ratio of the pyrolysis section to the gasification section is 2. A certain bituminous coal enters the pyrolysis section of the gasifier through the feed port A after the catalyst loading process. After being upgraded in the pyrolysis section, it falls into the gasification section of the gasifier for gasification reaction. The high-concentration methane synthesis gas produced by the gasification section and the gas and tar produced by the pyrolysis section are discharged from the top of the gasification furnace, and enter the tar condensation recovery system after cyclone dust removal. After the tar is separated, it enters the low-temperature methanol washing section. Remove acid gases such as hydrogen sulfide and carbon dioxide to obtain methane-containing gas (containing hydrogen 50-55%, methane 28-35%, carbon monoxide 15-18%), and a small part of methane-containing gas returns to the gasifier a...

Embodiment 3

[0064] use Figure 4 Two-stage gasification furnace structure, the diameter ratio of the pyrolysis section and the gasification section is 1. A lignite enters the pyrolysis section of the gasifier through the catalyst loading process through the feed port A. After being upgraded in the pyrolysis section, it falls into the gasification section of the gasifier for gasification reaction. The high-methane-concentration syngas produced by the catalytic gasification section, together with the gas and tar produced by the pyrolysis section, are discharged from the top of the gasifier, and enter the tar condensation recovery system after cyclone dust removal, and part of high-quality superheated steam is generated through heat exchange. The gas from the tar condensation recovery outlet enters the low-temperature methanol washing section, and then undergoes methane synthesis. The high-quality superheated steam obtained by heat exchange is synthesized with methane to obtain high-concent...

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Abstract

The invention provides a gasification method for coproducing methane and light-weight tar, belonging to the field of coal catalytic gasification. The method can effectively enhance the yield of coal tar and especially the yield of light-weight tar while generating high-concentration methane. The gasification method comprises the following step: a carbon raw material sequentially passes through a pyrolysis section in the gasification furnace to perform cracking reaction and passes through a gasification section to perform gasification reaction, thereby forming the methane synthetic gas, wherein methane-containing gas is introduced into the pyrolysis section, and the methane in the methane-containing gas is cracked to promote the generation of the light-weight tar. The method can be used in a gasification technique for coproducing methane and light-weight tar.

Description

technical field [0001] The invention relates to the field of coal catalytic gasification, in particular to a gasification method for co-producing methane and light tar. Background technique [0002] Coal catalytic gasification technology is an important way of clean and efficient utilization of coal. Using coal catalytic gasification technology, coal is gasified with a gasification agent composed of water vapor, hydrogen, and carbon monoxide under the catalytic action of a catalyst under certain pressure and temperature conditions. reaction, producing high concentrations of methane. Compared with other coal gasification technologies, coal catalytic gasification technology has the advantages of high methane content, low temperature required for gasification reaction, and by-product tar at the same time. [0003] The existing technology is to pre-mix coal and catalyst into the gasifier, control the temperature in the furnace at about 700°C, and the reaction pressure at about ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/54C10L3/08C10G1/00
Inventor 祖静茹李克忠郑岩
Owner ENN SCI & TECH DEV
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