Methane/CO{sub 2} sorption modeling for coalbed methane production and CO{sub 2} sequestration
- Southern Illinois University-Carbondale, Carbondale, IL (United States). Department of Mining and Mineral Resources Engineering
A thorough study of the sorption behavior of coals to methane and carbon dioxide (CO{sub 2}) is critical for carbon sequestration in coal seams and enhanced coalbed methane recovery. This paper discusses the results of an ad/de-sorption study of methane and CO{sub 2}, in single gas environment, on a set of coal samples taken from the San Juan and Illinois Basins. The results indicate that, under similar temperature and pressure conditions, coals exhibit higher affinity to CO{sub 2} as compared to methane and that the preferential sorption ratio varies between 2:1 and 4:1. Furthermore, the experimental data were modeled using Langmuir, BET, and Dubinin-Polanyi equations. The accuracy of the models in quantifying coal-gas sorption was compared using an error analysis technique. The Dubinin-Radushkevich equation failed to model the coal-gas sorption behavior satisfactorily. For methane, Langmuir, BET, and Dubinin-Astakhov (D-A) equations all performed satisfactorily within comparable accuracy. However, for CO{sub 2}, the performance of the D-A equation was found to be significantly better than the other two. Overall, the D-A equation fitted the experimental sorption data the best, followed by the Langmuir and BET equations. Since the D-A equation is capable of deriving isotherms for any temperature using a single isotherm, thus providing added flexibility to model the temperature variation due to injection/depletion, this is the recommended model to use. 49 refs., 9 figs., 5 tabs.
- OSTI ID:
- 20781460
- Journal Information:
- Energy and Fuels, Vol. 20, Issue 4; Other Information: satya@engr.siu.edu; ISSN 0887-0624
- Country of Publication:
- United States
- Language:
- English
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