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A method for concentrating and separating methane in low-concentration coalbed methane

A low-concentration technology for coalbed methane, applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems that have not been successfully reported, and achieve the effect of shortening the time and improving the efficiency of concentration and separation

Active Publication Date: 2020-12-11
CCTEG CHINA COAL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the production of compressed natural gas (CNG) and liquefied natural gas (LNG) by pressure swing adsorption concentration and separation of low-concentration coalbed methane mostly controls the adsorption time of a single tower to more than 120s, and adopts the method of multi-stage pressure swing adsorption separation, while the adsorption time of a single tower is between 1 and 2 The low-concentration coalbed methane pressure swing adsorption concentration separation process below 120s has not been successfully reported

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  • A method for concentrating and separating methane in low-concentration coalbed methane

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Embodiment 1

[0028] Embodiment 1, to CH 4 Rapid concentration and separation of low-concentration coalbed methane with a content of 10-15%

[0029] The technological process of present embodiment fast concentration and separation is as follows figure 1 As shown, among them, 1 is the low-concentration coalbed methane of raw material gas, 2 is the compression step, 3 is the purification step, 4 is the first-stage pressure swing adsorption concentration step, 5 is the first-stage pressure swing adsorption concentration and evacuation tail gas, 6 7 is the purification step, 8 is the second-stage PSA concentration, 9 is the return gas of the second-stage PSA concentration, and 10 is the final product gas.

[0030] The specific process is as follows:

[0031] 1) compressing the low-concentration coalbed methane as raw material gas to obtain compressed coalbed methane, the pressure of the compressed coalbed methane is 0.15MPa;

[0032] Among them, the names and volume percentages of each compo...

Embodiment 2

[0042] Embodiment 2, to CH 4 Rapid concentration and separation of low-concentration coalbed methane with a content of 15-20%

[0043] The technological process of present embodiment fast concentration and separation is as follows figure 1 As shown, among them, 1 is the low-concentration coalbed methane of raw material gas, 2 is the compression step, 3 is the purification step, 4 is the first-stage pressure swing adsorption concentration step, 5 is the first-stage pressure swing adsorption concentration and exhaust gas, 6 7 is the purification step, 8 is the second-stage PSA concentration, 9 is the return gas of the second-stage PSA concentration, and 10 is the final product gas.

[0044] The specific process is as follows:

[0045] 1) Compressing the low-concentration coalbed methane 1 as raw material gas to obtain compressed coalbed methane, the pressure of the compressed coalbed methane is 0.15MPa;

[0046] Among them, the names and volume percentages of each component of ...

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Abstract

The invention discloses a method for concentrating and separating methane in low-concentration coal bed gas. The method includes the following step of conducting at least one time of processing on thelow-concentration coal bed gas to concentrate and separate the methane in the low-concentration coal bed gas, wherein the processing sequentially includes compressing processing, purifying processingand variable-pressure adsorbing and concentrating processing. The method is simple, the separation time is short, and the volume percent fraction of the methane in the low-concentration coal bed gascan be reduced from 10-30% to 92% or above.

Description

technical field [0001] The invention relates to a method for concentrating and separating methane in low-concentration coal bed gas, belonging to the field of gas separation. Background technique [0002] Low-concentration coalbed methane is coalbed methane with methane concentration lower than 30%. According to the national "Coal Mine Safety Regulations", the methane concentration should not be lower than 30% when coalbed methane is utilized. For this part of coalbed methane, the current practice is to use it as domestic fuel near the coal mine or to discharge it directly. my country has developed a low-concentration coalbed methane power generation technology in 2005, and it has been widely promoted and applied nationwide. However, because this power generation technology has high requirements on the transmission technology of oxygen-containing coalbed methane, and it is difficult to connect with the power grid, the resource utilization rate is not high. . With the conti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10
CPCC10L3/10C10L3/101C10L2290/542
Inventor 郭昊乾李雪飞车永芳王鹏张进华
Owner CCTEG CHINA COAL RES INST