Kinetics of Methane Emission from Coal of Different Microstructural Nonuniformity
E. V. Ul’yanova, O. N. Malinnikova, E. V. Fedorov, I. N. Gorshenkov, B. N. Pashichev
Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources-IPKON, Russian Academy of Sciences, Moscow, Russia
Keywords: Coal seams, face zone, methane, microstructure, information entropy, statistical complexity
Abstract
The methane emission parameters are determined in the face areas of the Boldyrev seam, Kirov Mine, and seams 50 and 52, Yalevsky Mine. It is shown that coal of the same seam can have greatly different gas emission rates determined in a few hours after coal detachment from rock mass. The gas emission rate depends on the regularity of microstructure, determined by calculation of information entropy and statistical complexity using digital images of coal surface from an electron microscope. The lower gas emission rate is a feature of coal with a less uniform (more chaotic) microstructure, which is explained by the higher number of cut-off bonds in the aliphatic component of coals, while these bonds are the adsorption centers and prevent faster diffusion of methane.
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