Ultimate Gas–Related Length and Output of Production Heading Considering Nonuniform Airflow
A. A. ORDIN1, A. M. TIMOSHENKO2, S. A. KOLENCHUK3
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2East Research Institute, ul. Institutskaya 3, Kemerovo, 650002 Russia
3Giprougol Institute, ul. Trikotazhnaya 41, Novosibirsk, 630015 Russia
Keywords: mine, coal bed, permissible length and output of production heading, gas factor, airflow velocity nonuniformity, air leakage, methane concentration
Abstract
Procedures for calculating permissible gas-related length and output of a fully mechanized production heading considering nonuniform airflow over cross-section and lengthwise the longwall are described. Nonlinear relations are derived for methane concentrations and air leakage in mined-out area. It is proposed to assess a production heading output based on the gas-related permissible length of the heading and the coal cutting chart with a cutter-loader. It is found that increased gas content of coal and higher air leakage in mined-out area causes reduction of gas-related length and results in decreased output of production headings.
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