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Coalbed gas condensation method

A technology of coalbed methane and raw material gas, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, to achieve the effects of optimizing energy structure, reducing air pollution, and improving energy structure

Inactive Publication Date: 2008-01-02
赵士华 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Developing N using membrane technology 2 and CH 4 There is no successful report on the separation membrane, and further in-depth research is required

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Embodiment Construction

[0046] In the present invention, unless otherwise specified, content, concentration and purity are volume percentages.

[0047] Gas composition analysis of coalbed methane:

[0048] The main components of coalbed methane extracted from the goaf or working face of the Dalong Mine are: CH 4 , CO 2 , CO, C 2 h 4 、C 2 h 6 , N 2 , O 2 , where CO, C 2 h 4 、C 2 h 6 The content of the three gases is very small in coalbed methane.

[0049] The main gas of coalbed methane is CH 4 , O 2 , N 2 and CO 2 , through the analysis of the coal seams extracted from Dalong Mine, the results are shown in Figure 1-4. From the above analysis, it can be known that from the perspective of the overall content, N 2 Content accounted for the main body, CH 4 Average content ratio O 2 Slightly higher, CO 2 lowest.

[0050] From the point of view of the relationship, N 2 and CH 4 The relationship is linear, that is, N 2 When the content is from 0-78%, CH 4 The content is basically eve...

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Abstract

The invention relates to a method for concentrating the air of coal bed, which uses the transformation adsorption and film separation techniques to realize the CH4 concentration and N2 recovery of coal bed gas. The invention comprises the transformation adsorption and film separation, wherein, the parameters of transformation adsorption process comprise: the pressure of transformation adsorption is controlled in 0.8-2.4MPa; the pressure of decompression desorption is controlled in 0.1-0.02MPa of passive pressure; and the temperature is controlled between 4-25Deg. And the parameters of film separation process comprise: the diameter of film is less than 0.01mu m, and the ratio between high and low pressures is more than 4. The invention utilizes the combination between transformation adsorption and film separation to concentrate CH4 and recover the N2 to realize the comprehensive utilization of lower-concentration extraction of coal-bed gas, which can improve and optimize the energy source structure, confirm the safety of coal mine, reduce the producing cost and reduce the air pollution.

Description

technical field [0001] The invention relates to a method for concentrating coalbed methane, specifically, realizing the concentration of CH in coalbed methane by adopting pressure swing adsorption and membrane separation technology 4 and recycle N 2 comprehensive utilization method. Background technique [0002] The total amount of coalbed methane (also called coal mine gas) resources in my country is 35 trillion cubic meters, which is roughly equivalent to the reserves of natural gas and ranks third in the world. CBM is both an energy source and a major greenhouse gas. The comprehensive utilization of coalbed methane resources has important economic and environmental significance for improving and optimizing the energy structure, ensuring safe production of coal mines, reducing production costs of coal mines, and reducing air pollution. [0003] As a high-quality and clean energy source, coalbed methane is mainly composed of methane. The calorific value of methane is 33...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00B01D53/047B01D53/22
Inventor 赵士华赵芮芙
Owner 赵士华
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