NDLI: Study of high-pressure sorption of methane on Chinese coals of different rank

Content Provider	Springer Nature Link
Author	Shen, Jian Qin, Yong Fu, Xuehai Wang, Geoff Chen, Run Zhao, Lijuan
Copyright Year	2014
Abstract	To investigate the sorption and diffusion behavior of deep coals, high-pressure sorption experiments of methane on coals were performed by the volumetric method. The experimental sorption isotherms fit the Langmuir model over the experimental pressure and temperature ranges. The sorption volumes of all coals tested exhibit a typical temperature behavior with a negative exponent decreasing as temperature increases. An approximately linear correlation for the methane Langmuir volume with coal rank was observed. The effect of coal rank on adsorption volume decreases with increasing temperature. The Langmuir pressure decreases initially with coal rank, reaches a minimum pressure corresponding to the maximum vitrinite reflectance at ∼2.2 % and then increases. Studies on the diffusion of methane in coal using a unipore diffusion model showed that the effective diffusion coefficients for the seven coals studied varied from 2.98 to 68.3 × 10$^{−5}$ s$^{−1}$. The effective diffusion coefficients of coal at the first pressure step generally increased linearly with increasing temperature, and a complex nonlinear relationship for methane sorption rate with coal rank was observed. Finally, an empirical equation was developed to estimate the sorption capacity of methane on coal of a given rank as a function of the coal burial depth in a time-invariant pressure and temperature field. The sorption capacity of the moisture-equilibrated coal was found to increase with burial depth until it reaches a maximum of 24 cm$^{3}$/g at ∼1,500 m, followed by a slow decline to 20.5 cm$^{3}$/g at approximately 3,000 m.
Starting Page	3451
Ending Page	3460
Page Count	10
File Format	PDF
ISSN	18667511
Journal	Arabian Journal of Geosciences
Volume Number	8
Issue Number	6
e-ISSN	18667538
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-05-31
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chinese coal Coalbed methane High-pressure sorption Diffusion Sorption kinetics Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science

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