Abstract
Aiming at the problems of low utilization rate and serious environmental pollution caused by low concentration coal bed methane emission in a coal mine, the utilization technology of low concentration coal bed methane was studied by means of field investigation and theoretical calculation, and the technical solution of comprehensive utilization of low concentration coal bed methane combining regenerative oxidation and cryogenic liquefaction was obtained, which realized the “coal and gas are co-mined and shared” and constructed the virtuous cycle development of “use to promote pumping, pumping to promote safety”. The research shows that: the low concentration coal bed methane with concentration of about 5% is converted into high temperature flue gas by regenerative oxidation, and the heat energy is extracted to realize the heating in the mining area; the coal bed methane with concentration of more than 35% is purified and liquefied into LNG product by cryogenic liquefaction, so as to realize long-distance transportation. The technology improves the utilization rate of coal bed methane in the mining area and eliminates the burning of coal for heating. The annual utilization of pure gas is 53.38 million m3, generating economic benefits of 211 million yuan and reducing CO2 equivalent by 767,000 t. The safety, economic and environmental benefits are remarkable. This technology has practical significance to improve the utilization rate of gas and promote the realization of the goal of zero gas emission.
Highlights
With the vigorous development of industrial technology and the rapid increase of resource consumption [1], the situation of air pollution is grim, regional atmospheric environment problems are becoming increasingly prominent, and the pressure of pollution prevention and control is increasing, which damages people's health and affects social harmony and stability [2]
Methane is a kind of greenhouse gas, which will produce greenhouse effect when discharged into the atmosphere [4]
The coal bed methane extracted from adjacent strata is 61.46 million m3, the concentration is more than 35%, and the utilization is 20.77 million m3
Summary
With the vigorous development of industrial technology and the rapid increase of resource consumption [1], the situation of air pollution is grim, regional atmospheric environment problems are becoming increasingly prominent, and the pressure of pollution prevention and control is increasing, which damages people's health and affects social harmony and stability [2]. The coal bed methane with concentration more than 35% is purified and liquefied into LNG product by means of deep cold liquefaction, so as to realize long-distance transportation. In this context, combined with the technology of coal and gas co-mining and sharing [10,11,12] and according to the actual energy demand of coal mines, the emission of low-concentration coal bed methane can be reduced by utilizing the technology of comprehensive utilization of low-concentration coal bed methane. The coal bed methane with concentration more than 35% is purified and liquefied into LNG product by cryogenic liquefaction method, so as to realize long-distance transportation.
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