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Ultimate length and capacity of production heading with regard to gas content, considering nonuniform air flow

Procedures for calculating permissible length and capacity of a fully mechanized production heading with regard to gas content and considering nonuniform air flow across and along longwall are described. Nonlinear relations are derived for methane concentrations and air leakage into mined-out area....

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Published in:	Journal of mining science 2015-07, Vol.51 (4), p.771-778
Main Authors:	Ordin, A. A., Timoshenko, A. M., Kolenchuk, S. A.
Format:	Article
Language:	English
Subjects:	Air flow Coal Coal industry Cutting Earth and Environmental Science Earth Sciences Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Leakage Longwall Mathematical analysis Methane Mineral Mining Technology Mineral Resources Natural gas Nonuniform
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description	Procedures for calculating permissible length and capacity of a fully mechanized production heading with regard to gas content and considering nonuniform air flow across and along longwall are described. Nonlinear relations are derived for methane concentrations and air leakage into mined-out area. It is proposed to assess a production heading capacity based on the gas-related permissible length of the heading and the coal cutting chart with a shearer. It is found that the increased gas content of coal and higher air leakage into mined-out area results in reduction of gas-related length and capacity of production headings.
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subjects	Air flow Coal Coal industry Cutting Earth and Environmental Science Earth Sciences Geophysics/Geodesy Geotechnical Engineering & Applied Earth Sciences Leakage Longwall Mathematical analysis Methane Mineral Mining Technology Mineral Resources Natural gas Nonuniform
title	Ultimate length and capacity of production heading with regard to gas content, considering nonuniform air flow
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