Method and device for preparing methane-containing gas by using coal

A methane and gas technology, which is used in the field of coal gasification to prepare substitute natural gas, can solve the problems of uneven heating of the solid phase of the bed, high carbon content in the residue, and slow heat transfer rate.

Active Publication Date: 2012-07-18
ENN SCI & TECH DEV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the utilization rate of the reaction volume in the gasifier is low, which affects the solid-phase processing; only using superheated steam as the gasification agent results in a low carbon conversion rate, so the carbon content in the residue is high, and the coal is difficult to be effectively utilized; in this method The heat in the high-temperature gas needs

Method used

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  • Method and device for preparing methane-containing gas by using coal
  • Method and device for preparing methane-containing gas by using coal
  • Method and device for preparing methane-containing gas by using coal

Examples

Experimental program
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Effect test

Embodiment 1

[0056] see figure 1 , which schematically shows a process flow diagram of a preferred embodiment of the present invention.

[0057] The selected coal is bituminous coal or lignite, the raw coal is crushed to a particle size of 0.1-2mm, and the alkali metal catalyst K 2 CO 3 It is wet mixed with coal powder at a weight ratio of 1:10. After drying, it is pressurized and enters the gasifier through a rotary feeder. The absolute pressure in the gasifier is 3.5MPa, and the gasification agent is reformed by methane. The temperature of the gasification agent is above 800°C. The gasification agent entering the gasifier: the weight ratio of coal is 2:1. The gasification agent enters the gasifier in two streams, and one enters from the distribution plate of the gasifier. The gasifier, another stream enters the gasifier from the center hole of the distribution plate of the gasifier, and the coal residue after coal gasification is smoothly discharged by controlling the operating gas vel...

Embodiment 2

[0061] still see figure 1 , the difference lies in the absolute pressure in the gasifier and the gasification agent: coal weight ratio.

[0062] The selected coal is bituminous coal or lignite, the raw coal is crushed to a particle size of 0.1-2mm, and the alkali metal catalyst K 2 CO 3 It is wet mixed with coal powder at a weight ratio of 1:10. After drying, it is pressurized and enters the gasifier through a rotary feeder. The absolute pressure in the gasifier is 0.1MPa, and the gasification agent is supplied by the methane reformer The temperature of the gasification agent is above 800°C, the gasification agent entering the gasifier: the weight ratio of coal is 1:1, the gasification agent enters the gasifier in two streams, and one enters the gasifier from the The other stream enters the gasifier from the center of the distribution plate of the gasifier, and the coal residue after coal gasification is smoothly discharged by controlling the operating gas velocity at the ce...

Embodiment 3

[0064] The basic process of this embodiment can be found in figure 1 , the difference is that the absolute pressure in the gasifier and the gasification agent: coal weight ratio are changed, and the methane-containing stream entering the methane reforming reactor is changed.

[0065] The selected coal is bituminous coal or lignite, the raw coal is crushed to a particle size of 0.1-2mm, and the alkali metal catalyst K 2 CO 3 It is wet mixed with coal powder at a weight ratio of 1:10. After drying, it is pressurized and enters the gasifier through a rotary feeder. The absolute pressure in the gasifier is 4.1MPa, and the gasification agent is supplied by the methane reformer The temperature of the gasification agent is above 800°C. The gasification agent entering the gasifier: the weight ratio of coal is 2.5:1. The gasification agent enters the gasifier in two streams. The other stream enters the gasifier from the center of the distribution plate of the gasifier, and the coal r...

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Abstract

The invention discloses a method for preparing a methane-containing gas by using coal, which comprises the following steps that: a. pulverized coal is added to a coal pyrolysis area of a gasifier which sequentially comprises the coal pyrolysis area and a catalytic gasification area from top to bottom, and in the coal pyrolysis area, the pulverized coal is in contact with a gasification product stream from the catalytic gasification area to at least partially pyrolyze the pulverized coal to form a methane-containing gas stream and at least partial pyrolyzed pulverized coal; b. the at least partial pyrolyzed pulverized coal is sent to the catalytic gasification area and is in contact with a gasifying agent introduced into the catalytic gasification area under the action of a catalyst, the generated gasification product stream flows upwardly into the coal pyrolysis area, and fully unreacted coal residue is discharged out of the catalytic gasification area; and the gasifying agent comprises water vapor, hydrogen and carbon monoxide. The invention also discloses a device for preparing the methane-containing gas by using coal, and the device uses the method.

Description

technical field [0001] The invention relates to the field of coal gasification to prepare substitute natural gas, in particular to a method and equipment for preparing methane-containing gas by gasifying coal with a pressurized two-stage gasifier. Background technique [0002] my country is a country rich in coal, poor in oil and little in gas. With the rapid development of society and economy, the demand for natural gas in my country has risen sharply, and its proportion in the energy structure has increased rapidly. However, domestic natural gas is still in the early stages of exploration and development, imports are also in the initial stage, and the supply capacity is seriously lagging behind, resulting in increasingly prominent contradictions between natural gas supply and demand. The use of coal, which has relatively large resource advantages in my country, can not only promote the efficient and clean utilization of coal; but also use the existing natural gas pipelines...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 毕继诚孙志强崔鑫祖静茹李克忠毛燕东康守国
Owner ENN SCI & TECH DEV
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