Skip to main content

Research Repository

Advanced Search

Gas diffusion in coal powders is a multi-rate process

Mathias, Simon; Dentz, Marco; Liu, Qingquan

Gas diffusion in coal powders is a multi-rate process Thumbnail


Authors

Marco Dentz

Qingquan Liu



Abstract

Gas migration in coal is strongly controlled by surface diffusion of adsorbed gas within the coal matrix. Surface diffusion coefficients are obtained by inverse modelling of transient gas desorption data from powdered coals. The diffusion coefficient is frequently considered to be dependent on time and initial pressure. In this article, it is shown that the pressure dependence can be eliminated by performing a joint inversion of both the diffusion coefficient and adsorption isotherm. A study of the log–log slope of desorbed gas production rate against time reveals that diffusion within the individual coal particles is a multi-rate process. The application of a power-law probability density function of diffusion rates enables the determination of a single gas diffusion coefficient that is constant in both time and initial pressure.

Citation

Mathias, S., Dentz, M., & Liu, Q. (2020). Gas diffusion in coal powders is a multi-rate process. Transport in Porous Media, 131, 1037-1051. https://doi.org/10.1007/s11242-019-01376-x

Journal Article Type Article
Acceptance Date Dec 2, 2019
Online Publication Date Dec 10, 2019
Publication Date 2020
Deposit Date Dec 3, 2019
Publicly Available Date Dec 10, 2020
Journal Transport in Porous Media
Print ISSN 0169-3913
Electronic ISSN 1573-1634
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 131
Pages 1037-1051
DOI https://doi.org/10.1007/s11242-019-01376-x
Public URL https://durham-repository.worktribe.com/output/1312592

Files


Accepted Journal Article (560 Kb)
PDF

Copyright Statement
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.





You might also like



Downloadable Citations