Discussion on the Selection and Application of Decarbonization Process for High CO2 Coalbed Methane
The main component of coalbed methane gas is CH4,with a small amount of non hydrocarbon gases such as CO2 and N2.The proportion of CH4,CO2,and N2 is in a reciprocal relationship.N2 is an inert gas,and its content not only affects the calorific value of coalbed methane,but also poses no other hazards.However,a high concentration of CO2 significantly reduces the calorific value and combustion efficiency of coalbed methane,and can also corrode surface gathering and processing pipelines and equipment,shortening the service life of metal pipelines and equipment.Therefore,decarbonization is an important way to efficiently utilize high CO2 coalbed methane.This article introduces three mature processes suitable for decarbonization of coalbed methane,and provides a comprehensive comparison in terms of one-time investment in equipment,methane recovery rate,and operating costs.Given the low production of coalbed methane,it is recommended to use the MDEA method to efficiently process high CO2 coalbed methane,in order to achieve a higher methane recovery rate and maximize the commercial and economic benefits of coalbed methane.
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