Coal gas enrichment apparatus with exhaust end air boosting and enrichment method

Abstract

The invention provides a coal gas enrichment apparatus with exhaust end air boosting and an enrichment method. The coal gas enrichment apparatus comprises a blower, an intake buffer tank, an intake control valve, a vacuumizing control valve, an exchange control valve, an exhaust control valve, a pressure equalization control valve, an adsorbing column, an air boosting control valve, an air boosting filter, a vacuum pump, a product gas buffer tank and an exchange reflow valve. The enrichment method of the coal gas enrichment apparatus comprises the steps of adsorbing, exchanging, equal pressuredrop, vacuumizing, equal pressure rise and air boosting; air is used to perform boosting from the exhaust end of the adsorbing column during adsorbing column boosting; the air reverse boosting step is performed at the exhaust end of the coal gas enrichment apparatus, penetrating time of the adsorbing column can be shortened, it can be avoided that the outlet end of the adsorbing column contains methane residue after boosting, and product gas methane concentration and recovery rate can be increased accordingly.

Description

technical field [0001] The invention relates to the field of pressure swing adsorption gas separation, in particular to a coal mine gas enrichment device and method thereof with air boosting at an exhaust end. Background technique [0002] my country is a large coal country, and the proven reserves of coalbed methane are 36.81m 3 , ranking third in the world. However, the utilization rate of coal mine gas in my country is indeed very low. According to statistics, the extraction volume of coalbed methane in 2012 was 12.5 billion cubic meters, and the utilization volume was only 5.2 billion cubic meters, of which the underground gas extraction volume was 9.94 billion cubic meters. It is 3.18 billion cubic meters, and the utilization rate is 32%. The main reason is the low concentration of underground gas drainage. According to statistics, the gas concentration of 2 / 3 mines is lower than 25%. In addition, the concentration of coal mine methane gas will gradually decrease duri...

AI Technical Summary

Problems solved by technology

In addition, the concentration of coal mine gas will gradually decrease during the extraction process. At present, the concentration of gas extracted from a large part of mines has been lower than 15%, or even lower than 10%, resulting in the failure of the original gas generator set to start.

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