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 cm3/g at ∼1,500 m, followed by a slow decline to 20.5 cm3/g at approximately 3,000 m.
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Acknowledgments
The authors thank reviewers for providing constructive remarks and comments. Financial support for this work as provided by the Fundamental Research Funds for the Central Universities (Nos. 2012QNB32 and 2013XK06), the open fund from the Key Laboratory of Coal-based CO2 Capture and Geological Storage (No. 2012KF04), the National Key Research Program for Science and Technology of China (No. 2011ZX05042), and the National Natural Science Funds of China (Nos. 41362009 and 41302131) and the Australia Research Council Discovery program (DP1113229) for facilitating collaboration between the University of Queensland and the China University of Mining and Technology are gratefully acknowledged.
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Shen, J., Qin, Y., Fu, X. et al. Study of high-pressure sorption of methane on Chinese coals of different rank. Arab J Geosci 8, 3451–3460 (2015). https://doi.org/10.1007/s12517-014-1459-y
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DOI: https://doi.org/10.1007/s12517-014-1459-y