Method for purifying and liquefying coalbed gas

Abstract

The invention relates to a method for purifying and liquefying coalbed gas, the method is used for purifying and liquefying the exhausted oxygen-containing mixed coalbed gas of worked-out areas and mining areas, and the method is mainly realized through the following process: raw material coalbed gas-deoxidation-pressure boosting-decarburization-dehydration-denitrification-storage and transportation, wherein, the dioxidation is carried out as follows: the sulfur-tolerant catalytic deoxidation process mixes the raw material coalbed gas with part of deoxidizing circulating gas in a gas cabinet at 70KPa, the mixed gas enters a reactor after pre-heating by a pre-heater, methane and oxygen are reacted in a catalyst bed within a certain temperature range to generate CO2 and H2O; then the pressure boosting is carried out, the MEA plus MDEA decarburization process is adopted for decarburization, the physical absorption method is utilized for dehydration, the mixed refrigerant process is adopted for denitrification, and the storage and the transportation are carried out according to the standards. The method solves the problems that the deoxidization after pressure boosting is unsafe and the daily processing capacity of the raw material layer for production is small of the prior art. The method can be widely used for purifying and liquefying the exhausted oxygen-containing mixed coalbed gas of the worked-out areas and the mining areas.

Description

Technical field: [0001] The invention relates to a coal bed gas purification and liquefaction method for pumping and liquefying oxygen-containing mixed coal bed gas in goafs and active mining areas. Background technique: [0002] At present, domestic research on the purification and liquefaction of oxygen-containing coalbed methane has just started. In July 2007, Beijing Zancheng International Investment Co., Ltd. and Yangquan Coal Industry Group Co., Ltd. built the first oxygen-containing coalbed methane purification and liquefaction device in Yangquan, Shanxi. The volume is 5,000 cubic meters, and its technological process is: pressurization-decarbonization, sulfur-dehydration-liquefaction denitrogenation, deoxygenation-storage and transportation. The existing oxygen-containing coalbed methane purification and liquefaction process is pressurized first and then deoxidized. The problem with this method is that it is not safe, and the daily production capacity of raw coal sea...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coalbed methane purification and liquefaction method, which solves the problems in the prior art that it is not safe to pressurize first and then deoxidize, and the daily production capacity of raw coal seams is small, which cannot meet the production needs.

Images