Method containing carbon dioxide replacement for absorbing methane in condensed coal bed gas through pressure varying mode

A carbon dioxide and pressure swing adsorption technology, applied in chemical instruments and methods, methane capture, separation methods, etc., can solve the problems of low production efficiency, high separation cost, low recovery rate, etc., achieve high concentration and recovery rate, improve Concentration and yield, effects of mild separation conditions

Inactive Publication Date: 2009-10-07
TIANJIN UNIV
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Problems solved by technology

If the product gas methane is used as the replacement gas, the concentration can be increased from 20% to 93.7%, but a

Method used

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  • Method containing carbon dioxide replacement for absorbing methane in condensed coal bed gas through pressure varying mode
  • Method containing carbon dioxide replacement for absorbing methane in condensed coal bed gas through pressure varying mode
  • Method containing carbon dioxide replacement for absorbing methane in condensed coal bed gas through pressure varying mode

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Embodiment Construction

[0038] The following describes the present invention in detail with reference to the accompanying drawings, but the present invention is not limited to these examples.

[0039] The pressure swing adsorption process flow of the present invention can adopt the process flow of single tower, two towers or multiple towers, and examples are as follows.

[0040] (1) Three-tower process for pressure displacement of carbon dioxide, Figure 1a , Figure 1b , Figure 1c and Figure 1d Respectively, the three-tower carbon dioxide pressure displacement adsorption flow chart of the present invention as an exemplary process. The main devices involved are adsorption tower A, adsorption tower B and adsorption tower C, gas storage tank V01, gas storage tank V02 and gas storage tank V04, vacuum tank V03, vacuum pump P01 and compressor P02.

[0041] 1. Adsorption ( Figure 1a )

[0042] Raw coalbed methane enters the adsorption tower A at normal temperature and adsorption pressure. The stron...

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Abstract

The present invention relates to a method which contains carbon dioxide replacement and is used for absorbing methane in condensed coal bed gas through pressure varying mode. The method mainly comprises the following steps: absorbing the feed gas, replacing the working substance gas, regenerating the bed layer, charging the secondary product gas, recovering the working substance gas, etc., wherein, the replacing of working substance gas adopts an operation mode of pressurized replacing or normal-pressure replacing, namely the carbon dioxide is used for replacing and absorbing the methane under the absorption pressure, or under the normal pressure. The invention causes that the methane becomes the tower top product thereby increasing the concentration and yield of methane of product gas. The product gas obtained from the coal bed gas with 20% of methane concentration. The recovery rate obtains 90%. The method of the invention is suitable for the coal bed gases with different methane contents. The coal bed gas with low methane concentration can be changed into the high-quality natural gas fuel with a low cost. The product gas can be conveyed through pipe and can be stored with pot.

Description

technical field [0001] The invention relates to the coalbed methane development technology in the field of clean energy, in particular to a method for concentrating coalbed methane by pressure swing adsorption including carbon dioxide replacement. Background technique [0002] Methane contained in coal seams is a high-quality gaseous fuel, and it is also an important source of underground disasters in coal mines and the greenhouse effect of the atmosphere. If the methane concentration in the coalbed methane reaches more than 80%, it can be directly used as a clean fuel, but the methane concentration in the drained coalbed methane is generally much lower than 80%. The coalbed methane released by coal mining in my country is as high as 6 billion cubic meters per year, accounting for 30% of the world's total emissions, while its utilization rate is only 7-8% [Zhang Xinmin, Coalbed methane - the heavy pressure of natural gas in my country Potential Fields, Natural Gas Chemical I...

Claims

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Application Information

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IPC IPC(8): B01D53/047C10L3/10C07C9/04C07C7/12
CPCY02C20/20Y02P20/151
Inventor 周理刘聪敏周亚平孙艳苏伟
Owner TIANJIN UNIV
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