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Method for purifying and liquefying coalbed gas

A coalbed methane and liquid technology, applied in the direction of liquefaction, refrigeration and liquefaction, gas fuel, etc., can solve the problems of small coal seam production capacity for daily processing of raw materials, unsafe deoxygenation after pressurization, and inability to meet production needs, etc., to achieve expanded transportation Utilize the radius, guarantee the compression safety, and improve the effect of gas extraction and drainage utilization

Inactive Publication Date: 2009-06-03
CNPC GREATWALL DRILLING ENG
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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.

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  • Method for purifying and liquefying coalbed gas
  • Method for purifying and liquefying coalbed gas

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Embodiment Construction

[0009] exist figure 1 Among them, a process in the purification and liquefaction method of coalbed methane, deoxidation: sulfur-resistant catalytic deoxidation process is that the raw coalbed methane is mixed with part of the deoxidized circulating gas in the gas cabinet at 70Kpa, and then enters the reactor after being preheated by the preheater. In the temperature range of 500℃-700℃, methane reacts with oxygen in the catalyst bed to form CO 2 and H 2 O; The high temperature deoxygenation enters the preheater and the reaction raw material gas is thermally handed over, and the waste heat boiler generates steam to recover the heat, and then enters the gas cabinet after cooling;

[0010] exist figure 2 , the CBM purification and liquefaction method is realized through the following processes: raw CBM - deoxygenation - pressurization - decarbonization - dehydration - denitrification - storage and transportation: from figure 1 After deoxidation, pressurize; pressurization: the...

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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 coalbed gas purification and liquefaction method for liquefying and liquefying a goaf and a dynamic mining area by pumping and discharging oxygen-containing mixed coalbed gas. Background technique: [0002] At present, the domestic research on the purification and liquefaction of oxygen-containing coalbed methane has just started. In July 2007, Beijing Favor International Investment Co., Ltd. and Yangquan Coal Industry Group Co., Ltd. built the first oxygen-containing coalbed methane purification and liquefaction plant in Yangquan, Shanxi Province. The volume is 5,000 cubic meters, and the process flow is: pressurization-decarburization, sulfur-dehydration-liquefaction denitrification, deoxygenation-storage and transportation. The existing oxygen-containing coalbed gas purification and liquefaction process is to pressurize first and then deoxidize. The problems of this method are unsafe, and the daily processing capacity of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10F25J1/02
Inventor 夏艳东王柱军梁红义陈德民吴辅兵
Owner CNPC GREATWALL DRILLING ENG
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