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Method for concentrating and separating methane from gas within explosive limit

A separation method and gas technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of gas safety without large-scale utilization, one-time concentration cannot be completely separated, and no successful reports, etc.

Inactive Publication Date: 2015-04-01
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, pressure swing adsorption separation and concentration of gas mostly removes the oxygen in the gas and then concentrates and separates it. The raw material gas CH 4 The concentration of gas is above 20%. The gas within the explosion limit range is not currently used on a large scale due to the impact of safety issues, and the process of direct pressure swing adsorption concentration and separation of low-concentration gas has not been successful. According to the report, a concentration cannot be completely separated and CH 4 The effect of enrichment is not good, and it is impossible to realize the popularization and application of industrialization. At the same time, it is also a big difficulty to develop a suitable adsorbent for multi-component gas separation. Many scholars are working on this aspect.

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  • Method for concentrating and separating methane from gas within explosive limit
  • Method for concentrating and separating methane from gas within explosive limit

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Embodiment 1

[0031] Embodiment 1, to CH 4 Concentrate and separate low-concentration gas within the explosion limit with a content of 5-10%

[0032] The technological process of the concentration and separation of the present embodiment is as follows: figure 2 As shown, wherein, 1 is the low-concentration gas as raw material gas, 2 is the compression step, 3 is the purification step, 4 is the primary PSA deoxidation step, 5 is the waste gas produced in the primary deoxidation treatment, and 6 is the compression step, 7 is the purification step, 8 is the secondary PSA denitrification step, 9 is the waste gas produced in the secondary denitrification treatment, 10 is the tertiary PSA concentration step, 11 is the product gas, and 12 is the waste gas produced in the concentration treatment.

[0033] The specific process is as follows:

[0034] 1) Compress the low-concentration gas 1 used as raw material gas to obtain compressed gas, the pressure of which is 0.1 MPa;

[0035] Among them, t...

Embodiment 2

[0046] Embodiment 2, to CH 4 Concentration and separation of low-concentration gas with a content of 10-20%

[0047] The technological process of the concentration and separation of the present embodiment is as follows: figure 2 As shown, wherein, 1 is the low-concentration gas as raw material gas, 2 is the compression step, 3 is the purification step, 4 is the primary PSA deoxidation step, 5 is the waste gas produced in the primary deoxidation treatment, and 6 is the compression step, 7 is the purification step, 8 is the secondary PSA denitrification step, 9 is the waste gas produced in the secondary denitrification treatment, 10 is the tertiary PSA concentration step, 11 is the product gas, and 12 is the waste gas produced in the concentration treatment.

[0048] The specific process is as follows:

[0049] 1) Compress the low-concentration gas 1 used as raw material gas to obtain compressed gas, the pressure of which is 0.1 MPa;

[0050] Among them, the names and volume...

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Abstract

The invention discloses a method for concentrating and separating methane from gas within an explosive limit. The method comprises the following steps: (1) carrying out first-stage pressure swing adsorption deoxidation treatment on low-concentration gas after compression and purification; and (2) sequentially compressing and purifying the gas processed in the step (1), and sequentially carrying out second-stage pressure swing adsorption deoxidation treatment and third-stage pressure swing adsorption deoxidation treatment, so as to concentrate and separate methane from the gas within the explosive limit. According to the method for concentrating and separating methane from the gas within the explosive limit, the concentration of methane in the gas is improved to 80%-90% from 5%-20% in a raw material gas; the targets of deoxidizing, denitriding and concentrating CH4 can be achieved by only selecting a carbon molecular sieve; the concentrating and separating efficacies are obviously improved; and the method has important meaning and application value in the aspect of industrialized promotion for concentrating and separating the gas.

Description

technical field [0001] The invention relates to a method for concentrating and separating methane in gas within explosion limits, belonging to the field of gas separation. Background technique [0002] Gas is an associated gas in the process of coal formation and coal metamorphism. The main component is methane. The relative density to air is 0.554, and its permeability is 1.6 times that of air. It is difficult to dissolve in water, does not support combustion, and cannot maintain breathing. In the standard state, the gas explosion limit is 5% to 16% (methane concentration). As the pressure and temperature increase, the gas explosion range will increase. According to the extraction method, gas can be divided into surface extraction and underground extraction. CH in the surface extraction gas 4 The concentration can reach more than 80%. However, due to the infiltration of a large amount of air in the underground gas extraction process, CH 4 The concentration changes from 20...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10B01D53/047B01D46/00
Inventor 李雪飞董卫果刘畅车永芳郭昊乾张进华李小亮韩璐李兰廷
Owner CCTEG CHINA COAL RES INST