Analysis of the Influence of Coal Petrography on the Proper Application of the Unipore and Bidisperse Models of Methane Diffusion

Marcin Karbownik, Jerzy Krawczyk, Katarzyna Godyń, Tomasz Schlieter and Jiří Ščučka
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Marcin Karbownik: Department of Mining Aerology, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
Jerzy Krawczyk: The Strata Mechanics Research Institute of Polish Academy of Sciences, Reymonta 27, 30-059 Krakow, Poland
Katarzyna Godyń: The Strata Mechanics Research Institute of Polish Academy of Sciences, Reymonta 27, 30-059 Krakow, Poland
Tomasz Schlieter: Department of Computational Mechanics and Engineering, Silesian University of Technology, Konarskiego 18A, 44-100 Gliwice, Poland
Jiří Ščučka: Institute of Geonics of the CAS, Studentská 1768, 708 00 Ostrava, Czech Republic

Energies, 2021, vol. 14, issue 24, 1-20

Abstract: The analysis of phenomena related to gas transport in hard coal is important with regard to the energetic use of coal bed methane (CBM), the reduction of greenhouse gas emissions to the atmosphere (CO 2 ) and the prevention of natural hazards such as methane hazards and gas and rock outbursts. This article presents issues concerning the feasibility and scope of applying the unipore and bidisperse diffusion models to obtain knowledge concerning the kinetics of methane sorption and its diffusion in the carbon structure, depending on its petrography. Laboratory tests were carried out on coal samples which varied in terms of petrography. Quantitative point analyses were carried out, based on which content of groups of macerals was determined. The degree of coalification of coal samples was also determined based on measurements of vitrinite reflectivity R 0 and the volatile matter content V daf . Sorption kinetics were also investigated, and attempts were made to adjust the unipore and bidisperse models to the real sorption kinetic courses. This allowed the identification of appropriate coefficients controlling the course of sorption in mathematical models. An attempt was also made to assess the possibility of applying a given model to properly describe the phenomenon of methane sorption on hard coal.

Keywords: hard coal; sorption; petrography; gas transport; diffusion models; coal bed methane; natural hazards (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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