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Method for safe adsorption and enrichment of gas with low concentration

A low-concentration gas and safe technology, applied in the field of pressure swing adsorption gas separation, can solve problems such as gas explosion limit, and achieve the effect of improving quality, flexible and convenient operation, and low operating cost

Inactive Publication Date: 2010-06-16
UNIV OF SCI & TECH BEIJING +1
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Problems solved by technology

[0006] In order to solve the problem that it is easy to enter the gas explosion limit in the process of gas enrichment by pressure swing adsorption, the present invention provides a method for safe adsorption and enrichment of low-concentration gas (methane volume fraction less than 30%)

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  • Method for safe adsorption and enrichment of gas with low concentration
  • Method for safe adsorption and enrichment of gas with low concentration
  • Method for safe adsorption and enrichment of gas with low concentration

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] An embodiment of the method for safe adsorption and enrichment of low-concentration gas of the present invention is as follows: figure 2 As shown, raw gas is compressed by compressor 1 and flows into adsorption tower 3 through intake buffer tank 2 and control valve 4 . After the adsorbent in the adsorption tower 3 absorbs methane and oxygen in the raw gas, the exhaust gas flows out from the exhaust end of the adsorption tower, and flows through the throttle 5, the control valve 4, the one-way valve 6, and the exhaust buffer tank 7 in sequence. , Flow regulating valve 8 and then discharged into the atmosphere. After the adsorption is finished, the product gas is extracted from the adsorption tower 3 by the vacuum pump 9 .

[0018] The low-concentration methane gas components in this embodiment are as follows: the volume fraction of methane is 2...

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Abstract

The invention provides a method for the safe adsorption and enrichment of gas with low concentration. By a pressure swing adsorption method, a product of the gas is obtained from a desorption stage. In order to ensure the safety in the adsorption process, methane and oxygen gas are adsorbed simultaneously in the adsorption process, and the volume fractions of the methane and the oxygen gas are ensured within a safe range, wherein the volume fraction of the methane is below 5%, and the volume fraction of the oxygen gas is below 9.47%. In the invention, an adsorbent used in an adsorption tower is a mixed adsorbent which is mainly used for adsorbing the methane and the oxygen gas. In the invention, the adsorption pressure is controlled within 0.9MPa. The invention can enrich and utilize the drawn gas with low concentration in a coal mine and can also reduce the discharge of greenhouse gases.

Description

technical field [0001] The invention belongs to the technical field of pressure swing adsorption gas separation, and in particular relates to a method for safe enrichment of low-concentration gas, which is used for the safe enrichment and utilization of coal mine drainage gas. Background technique [0002] The content of methane in coalbed methane is generally 20-45%. The shallow coalbed methane resources within 2000 meters in my country are about 300,000-35 trillion cubic meters, which is almost the same as the total amount of natural gas resources and ranks third in the world. At present, my country's annual coal-bed methane emissions due to coal mining are more than 13 billion cubic meters, accounting for 1 / 3 of the world's total coal-bed methane emissions from coal mining, ranking first in the world. my country's "Coal Mine Safety Regulations" stipulates that when coalbed methane is utilized, the methane volume fraction shall not be lower than 30%, and coalbed methane wi...

Claims

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Application Information

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IPC IPC(8): B01D53/047C07C7/12C07C9/04
CPCY02C20/20
Inventor 刘应书杨雄李永玲张辉刘文海郭广栋孟宇张传钊曹红程张德鑫
Owner UNIV OF SCI & TECH BEIJING
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