Study on supercritical methane adsorption characteristics of coal with medium and high rank

doi:10.16265/j.cnki.issn1003-3033.2021.08.008

Abstract

Abstract: In order to reveal supercritical methane adsorption characteristics of coal with medium and high rank, more accurately predict coalbed gas resources and evaluate coalbed gas (gas) extraction effect in deep coal seam, four coal samples with different metamorphic degrees were selected to carry out isothermal adsorption tests by gravimetric method. Based on excess adsorption theory and Langmuir monolayer adsorption theory, adsorption phase density, number of adsorption methane layers and adsorption capacity of methane adsorbed by coal were studied under supercritical state of methane. The results show that excess adsorption capacity of coal appears a maximum value with increase of pressure, methane appears in monolayer arrangement on coal surface, absolute adsorption capacity increases with increase of adsorption pressure, and it increases slowly and tends to be stable when adsorption pressure is close to supercritical pressure 4.59 MPa. In supercritical state, methane adsorption on the surface of coal particles is dominated by monolayer, and two layers of adsorption gradually appear locally. Absolute adsorption capacity of anthracite is positively correlated with metamorphic degree at the same temperature and pressure, and ultimate adsorption capacity of anthracite is about twice that of middle-rank bituminous coal.

Key words: supercritical state, methane adsorption, coal with medium and high rank, adsorption phase density, number of adsorption layers

CLC Number:

X936

ZHANG Mingjie, YANG Mingxin, YAN Jiangwei, XIE Shuailong, LIANG Ximing, LI Zhe. Study on supercritical methane adsorption characteristics of coal with medium and high rank[J]. China Safety Science Journal, 2021, 31(8): 53-61.

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