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New technique for concentrating methane in oxygen-containing coal bed gas

A coal seam gas and new process technology, applied in the field of gas separation, to achieve the effect of simple equipment, reduced investment and operating costs, and reduced purification processes

Active Publication Date: 2014-06-18
四川省达科特能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies of the prior art above, the present invention provides a new process for concentrating methane in oxygen-containing coal seam gas to solve the problem of enriching CH in oxygen-containing coal seam gas by existing PSA. 4 According to different raw material concentrations and requirements, adaptable adsorbents are used to provide suitable high-efficiency and low-consumption PSA process technology

Method used

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  • New technique for concentrating methane in oxygen-containing coal bed gas
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  • New technique for concentrating methane in oxygen-containing coal bed gas

Examples

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Embodiment 1

[0022] Example 1 , the process is as figure 1 As shown, the methane content of coal mine gas is 12%, the adsorption pressure is 0.02MPa.G, the adsorption temperature is 40°C, and the adsorption tower is equipped with adsorption CH 4 The adsorbent, the pressure swing adsorption device is carried out using safety facilities associated with the present invention, the vacant space of the adsorption tower is filled with explosion-suppressing materials, and the pipeline is filled with explosion-suppressing materials accounting for 1% of the pipeline volume. Pressure swing adsorption process such as figure 1 As shown, a VPSA process with single-column adsorption and two pressure equalizations is adopted. The gas compressed by the compressor enters the pressure swing adsorption system consisting of five adsorption towers from 181 to 185. Taking the adsorption tower 181 as an example for CH 4 Process integration of recycling systems figure 1 To illustrate.

[0023] 1. Adsorption...

Embodiment 2

[0045] Example 2, Process such as figure 2 As shown, the methane content of coal mine gas is 40%, the adsorption pressure is 0.7 MPa.G, the adsorption temperature is 30°C, and the adsorption tower is equipped with 2 Adsorbent. The pressure swing adsorption device is carried out with the safety facilities associated with the present invention. Explosion-suppressing materials are filled in the empty space of the adsorption tower, and explosion-suppressing materials accounting for 1% of the pipeline volume are installed in the pipeline. Pressure swing adsorption process such as figure 1 As shown, a VPSA process with single-column adsorption and two pressure equalizations is adopted. The gas compressed by the compressor enters the pressure swing adsorption system consisting of five adsorption towers from 181 to 185. Taking the adsorption tower 181 as an example to remove O from gas 2 , N 2 Process integration of recycling systems figure 2 To illustrate.

[0046] 1. ...

example 3

[0066] Example 3 , the process is as figure 1 As shown, the methane content of coalbed methane is 75%, the adsorption pressure is 1.0 MPa.G, and the adsorption temperature is 40°C. A single tower is used for adsorption, and the adsorption tower is equipped with adsorption CH 4 the adsorbent. This PSA device also adopts the safety facility associated with the present invention to carry out, and the empty place of adsorption tower is filled with explosion-suppressing material, and pipeline is filled with the explosion-suppressing material accounting for 1% of pipeline volume. The implementation of PSA technological process is as example 1.

[0067] This example can get CH 4 Content 95%, O 2 For products with a content of <0.5%, the yield of methane is 99.5%.

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Abstract

The invention discloses a new technique for concentrating methane in oxygen-containing coal bed gas. Different adsorbents and different technological processes are adopted according to different concentrations of methane in the oxygen-containing coal bed gas, when concentration of methane in the oxygen-containing coal bed gas is low, a three-stage technological process is adopted, namely a first stage of low pressure methane enrichment technological process, a second stage of pressurized adsorption deoxygenation technological process, and a third stage of methane concentration technological process; when the concentration of the methane in the oxygen-containing coal bed gas is high, a two-stage technological process is adopted, namely a first stage of pressurized adsorption deoxygenation technological process and a second stage of methane concentration technological process, and 2-12 towers are arranged during an adsorption process. By adopting the new technique for concentrating the methane in the oxygen-containing coal bed gas, concentration of CH4 in the oxygen-containing coal bed gas can be increased to be more than 90%, O2 content can be reduced to be less than 0.5%, and a corresponding multi-stage concentrating way and a corresponding adsorbent are adopted in a concentrating process, so that technical defects in the prior art that PSA (polysulfone amide) is adopted for concentrating CH4 in the oxygen-containing coal bed gas are overcome.

Description

technical field [0001] The invention relates to the technical field of gas separation, in particular to a new process for enriching methane in oxygen-containing coal seam gas. Background technique [0002] For the enrichment of coal bed methane, there are many reports in the literature, and it is believed that pressure swing adsorption (PSA) is the most practical method among many methods. There are many domestic units conducting related research: [0003] First, in the key science and technology project task of the Ministry of Education's coalbed methane enrichment undertaken by Chongqing University, CH 4 / N 2 — Activated carbon is the research system for the selection of adsorbents. They believe that the PSA enrichment process for coalbed methane is currently very scarce, both in terms of research and application, and more efforts should be made in scientific research and engineering; [0004] Second, in the high-pressure adsorption laboratory of Tianjin University, it...

Claims

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Application Information

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IPC IPC(8): B01D53/047C10L3/10
Inventor 余兰金兰治淮刘清源
Owner 四川省达科特能源科技股份有限公司