Summary
Direct methods for the determination of the gas content of a coal seam are based upon extracting a coal sample, enclosing it in a sealed container and measuring the volume of the gas evolved. In our work we measured evolved gas as a function of time, type and quantity of low rank coal (lignite) at normal (atmospheric pressure and temperature) conditions. The evolved gas was, collected in gas sampling bags and analyzed by GC for its main components (carbon dioxide, methane and dimethyl sulfide). From the parameters obtained (gas volume, CH4:CO2 ratio, rate of gas desorption, time concentration profile and different lithotypes of lignite) a more detailed identification of hazardous areas in underground coal extraction could be ensured.
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References
B. E. Law, D. D. Rice, Hydrocarbons from Coal, The, American Association of Petroleum Geologists, Tulsa, USA, 1993.
Australian Standard AS 3980-1991: Guide to the determination of desorbable gas content of coal seams—Direct method.
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Zapušek, A., Marsel, J. Measurement of the composition of gas desorbed from coal by gas chromatography. Chromatographia 48, 154–155 (1998). https://doi.org/10.1007/BF02467533
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DOI: https://doi.org/10.1007/BF02467533