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Method for concentrating and separating methane in deoxidized coal bed gas

A technology for coalbed methane and methane, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of many components, inability to realize industrialization and application, and inability to completely separate after one concentration.

Active Publication Date: 2013-06-12
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the process of separation, concentration and deoxygenation of coalbed methane by pressure swing adsorption has many components, and the one-time concentration cannot be completely separated and CH 4 The effect of enrichment is not good, and it is impossible to realize the promotion and application of industrialization. At the same time, it is also a major difficulty that a suitable adsorbent can separate multi-component gases at the same time. Many scholars are working on this aspect.

Method used

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  • Method for concentrating and separating methane in deoxidized coal bed gas
  • Method for concentrating and separating methane in deoxidized coal bed gas
  • Method for concentrating and separating methane in deoxidized coal bed gas

Examples

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Effect test

Embodiment 1

[0022] Embodiment 1. Concentrating and separating the deoxygenated coal bed gas with CH4 content of 20-40%

[0023] The process of concentration and separation is as follows: figure 2 As shown, wherein, 1 is the deoxygenated coalbed methane as raw material gas, 2 is the compression step, 3 is the adsorption step, 4 is the primary PSA decarburization step, 5 is the secondary PSA denitrogenation concentration step, 6 is the product gas, 7 is the downgas produced in the decarbonization treatment, 8 is the waste gas produced in the decarburization treatment, 7 is the downgas produced in the denitrification and concentration treatment, and 10 is the waste gas produced in the denitrification and concentration treatment.

[0024] The concrete steps of this concentrated separation method are:

[0025] 1) compress the deoxygenated coalbed methane 1 as raw material gas to obtain compressed coalbed methane, and the pressure of the compressed coalbed methane is 1.0MPa;

[0026] Among t...

Embodiment 2

[0032]Embodiment 2, to CH 4 Concentration and separation of deoxygenated coalbed methane with a content of 40-60%

[0033] The process of concentration and separation is as follows: figure 2 shown. The concrete steps of this concentrated separation method are:

[0034] 1) Compressing the deoxygenated coalbed methane 1 as raw material gas to obtain compressed coalbed methane;

[0035] Among them, the name and volume percentage of each component in the feed gas are: CH 4 : 50%, CO: 4%, H 2 : 15%, N 2 : 31%, the pressure of methane is 4-5kPa, and the pressure of the compressed coalbed methane is 1.0MPa;

[0036] 2) the coalbed methane after step 1) gained compression uses separation factor The bulk specific gravity is 656g / L, and the processing gas volume is 2Nm 3 The carbon molecular sieve (model is BM-1) of / h carries out adsorption, obtains the coalbed methane after adsorption; Wherein, adsorption temperature is room temperature, and adsorption time is 180 seconds; T...

Embodiment 3

[0041] Embodiment 3, to CH 4 Concentration and separation of deoxygenated coalbed methane with a content of 60-80%

[0042] The process of concentration and separation is as follows: figure 2 shown. The concrete steps of this concentrated separation method are:

[0043] 1) Compressing the deoxygenated coalbed methane 1 as raw material gas to obtain compressed coalbed methane;

[0044] Among them, the name and volume percentage of each component in the feed gas are: CH 4 : 70%, H 2 : 3.6%, N 2 : 26.4%, the pressure of methane is 4-5kPa, and the pressure of the compressed coalbed methane is 1.0MPa;

[0045] 2) the coalbed methane after step 1) gained compression uses separation factor The bulk specific gravity is 656g / L, and the processing gas volume is 2Nm 3 The carbon molecular sieve (model is BM-1) of / h carries out adsorption, obtains the coalbed methane after adsorption; Wherein, adsorption temperature is room temperature, and adsorption time is 180 seconds; The a...

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Abstract

The invention discloses a method for concentrating and separating methane in deoxidized coal bed gas. The method comprises the following steps of: 1) compressing the raw material coal bed gas with oxygen content of no more than 1 volume percent to obtain the compressed coal bed gas; 2) adsorbing the compressed coal bed gas by using a carbon molecular sieve to obtain the adsorbed coal bed gas; and3) performing at least two-stage concentration and separation on the adsorbed coal bed gas obtained in the step 2) by using a pressure swing adsorption device to obtain the concentrated coal bed gas so as to finish concentration and separation of the methane in the deoxidized coal bed gas. By the method, the methane concentration of the coal bed gas is increased from 20-80 percent to 80-90 percent. In the method, only one carbon molecular sieve is used, and then the aims of concentrating CH4, decarbonizing and denitrifying can be fulfilled; and the concentration and separation efficiency is increased remarkably, and the method has significant meaning and application value in the aspect of industrial popularization of the coal bed gas.

Description

technical field [0001] The invention relates to the field of gas separation, in particular to the field of coal-bed methane, in particular to a method for concentrating and separating methane in deoxygenated coal-bed methane. Background technique [0002] Coalbed methane refers to self-generated and self-storage unconventional natural gas stored in coal seams, the main component of which is CH 4 . Its concentration varies from 20% to 80%. The measures currently used are mainly for power generation or as civil fuel, and the rest are directly emptied. Domestic natural gas consumption is gradually increasing, and the gap is getting bigger and bigger. If methane in coalbed methane is used as a supplementary or alternative fuel, its concentration must be increased to more than 90%. Because methane is a flammable and explosive gas, the O 2 Remove and eliminate its interference, and then separate and concentrate to ensure safety. [0003] Deoxygenated coalbed methane mainly co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01D53/047C10L3/10
Inventor 董卫果李雪飞李小亮张科达刘春兰国晖
Owner CCTEG CHINA COAL RES INST