Purification device for oxygen-containing coal bed methane

Abstract

The invention discloses a purification device for oxygen-containing coal bed methane. The device comprises a water sealed tank, a feed gas compressor, a feed gas acid removing absorption tower and a pressure swing adsorption system which are connected in series in turn, wherein the water sealed tank has a mixed water-cooling structure; absorption liquid in the feed gas acid removing absorption tower is aqueous solution of alkylol amine used for absorbing acid gas; by adopting the combined structure of the mixed water cooling structure, the absorption tower and the pressure swing adsorption system, the device can completely eliminate impurities apart from oxygen, nitrogen and methane in the oxygen-containing coal bed methane and provides good production conditions for a liquefaction separation step; and meanwhile, by adopting a necessary treatment measure, the potential safety hazard caused by mixing of methane and oxygen is eliminated.

Description

technical field [0001] The invention relates to a purification device utilizing the principle of absorption and adsorption, in particular to an oxygen-containing coal bed gas purification device. Background technique [0002] Oxygen-containing coalbed methane is the primary by-product pumped out during coal mining to prevent gas explosions and outbursts and ensure safe production in coal mines; its main component is methane, and it can be seen from its composition content that coalbed methane is a relatively important energy source and chemical raw materials. However, due to its complex composition, especially the oxygen contained in coalbed methane, it is a very dangerous combustion and explosion-supporting agent, which restricts the comprehensive utilization of oxygen-containing coalbed methane; in practice, in order to save costs, coalbed methane is generally used in the coal mining process Exhausted into the atmosphere, causing extreme waste of resources and pollution t...

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Problems solved by technology

[0004] However, there are many problems in the oxygen-containing coalbed methane purification process in this refrigeration process. It cannot completely remove various impurities in the raw material, which will affect the subsequent liquefaction and separation process, resulting in the liquefaction and separation process cannot be carried out stably. Taking corresponding safety measures due to the particularity of oxygen-containing coalbed methane has the hidden danger of explosion and combustion of oxygen-containing coalbed methane, affecting normal safe production and seriously affecting the personal safety of employees

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