Adsorption phase density characteristics of supercritical methane of granular coal

Authors

ZHANG Mingjie, Key Laboratory of Gas Geology and Gas Control of Henan Province-State Key Laboratory Breeding Base Jointly Built by Provinces and Ministries, Jiaozuo 454003, China; School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454003, China
LIU Hao, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
JIA Tianrang, Key Laboratory of Gas Geology and Gas Control of Henan Province-State Key Laboratory Breeding Base Jointly Built by Provinces and Ministries, Jiaozuo 454003, China; School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454003, ChinaFollow
GONG Ze, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
YANG Mingxin, School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Abstract

Finding out the characteristics of supercritical methane adsorption phase density of granular coal is the basis of studying the influence of temperature and pressure on methane adsorption amount of coal sample. Granular coal samples collected from Hebi No.6 Mine and Longshan Mine in Anyang-Hebi Coalfield were used to measure the isothermal adsorption lines at temperatures of 308 K, 313 K and 318 K, and pressures of 1-24 MPa by magnetic suspension balance isotherm adsorption device. The intercept method, Langmuir ternary model fitting method and liquid phase density method were used to calculate the adsorbed phase density at adsorption saturation and find out the influencing factors. By the method of constant adsorption phase volume, on the one hand, the adsorbed phase density were calculated, and the experimental phenomenon of negative value and peak inflection point of excess adsorption capacity was explained; on the other hand, a relatively ideal absolute adsorption capacity has been calibrated. The calculation results of adsorbed phase density show that the methane adsorption phase density is affected by temperature, pressure and coal metamorphism degree: it decreases with the increase of temperature, and increases rapidly with the increase of pressure at first, and then gradually slows down. The saturated adsorption phase density of anthracite is between 121.60-137.02 kg/m³, and that of meager lean coal is between 73.29-76.96 kg/m³. The calculation results of absolute adsorption capacity show that the absolute adsorption capacity corrected by liquid density method would appear negative value, which is obviously inconsistent with the reality; the absolute adsorption capacity corrected by intercept method and Langmuir ternay model method changes with the change of experimental conditions, in combination with the variation of adsorption constant b, the Langmuir ternary model is found to be the most suitable method to describe the adsorption behavior of supercritical methane.

Keywords

granular coal, supercritical methane, adsorbed phase density, excess adsorption capacity, absolute adsorption capacity

DOI

10.3969/j.issn.1001-1986.2021.05.012

Recommended Citation

ZHANG Mingjie, LIU Hao, JIA Tianrang, et al. (2021) "Adsorption phase density characteristics of supercritical methane of granular coal," Coal Geology & Exploration: Vol. 49: Iss. 5, Article 13.
DOI: 10.3969/j.issn.1001-1986.2021.05.012
Available at: https://cge.researchcommons.org/journal/vol49/iss5/13

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