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Modeling adsorption and transport behavior of gases in moist coal matrix

Chen, Min, Masum, Shakil and Thomas, Hywel 2021. Modeling adsorption and transport behavior of gases in moist coal matrix. Energy and Fuels 35 (16) , pp. 13200-13214. 10.1021/acs.energyfuels.1c01334

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Abstract

Water is ubiquitous in coalbeds, and its influence on coalbed carbon sequestration and/or methane recovery cannot be neglected. To investigate the roles of moisture content in gas transport and adsorption behavior, this paper presents a mass transport model for real gas transport in moist coal matrix based on multiple transport mechanisms. A modified kinetics in conjunction with Langmuir isotherm is proposed to incorporate the effects of moisture, and it is used to describe the mass change between bulk phase and adsorbed phase gases. The reliability of the model has been demonstrated through validation exercises. The results indicate that moisture in coal matrices alters both volume constant and pressure constant in conjunction with Langmuir isotherm. The presence of moisture can significantly reduce the gas adsorption capacity and hinder the loss of bulk gas diffusivity. The moisture effects on gas diffusion kinetics are associated with applied pressure, pore size, as well as the moisture contents. Larger pressures and pores can shorten the time for reaching equilibrium state. The moisture effects on the time required to reach equilibrium are more significant when pore sizes are smaller. The required time for adsorbed gas concentration reaching equilibrium is found to be shorter than that for the gas pressure due to the role of surface diffusion.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: American Chemical Society
ISSN: 0887-0624
Last Modified: 10 Sep 2021 13:45
URI: http://orca.cardiff.ac.uk/id/eprint/144008

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