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Fire Prevention and Extinguishing Technology of Fully Mechanized Top Coal Caving in Old Fire Goaf of Spontaneous Combustion Coal Seam
Pages: 67-70
Year: Issue:  1
Journal: Safety in Coal Mines

Keyword:  old fire areafire prevention and extinguishingliquid CO2nitrogen injectionfully mechanized top coal caving;
Abstract: In order to solve the difficult problem about fire prevention and extinguishing technology of fully-mechanized top coal caving under old fire goaf of spontaneous combustion coal seam in Xiagou Coal Mine of Binchang Mining Area, and with the condition of CO content continuously rising in the working surface ZF1801, the comprehensive fire prevention measures of"gas detection, yellow-mud grouting and liquid carbon dioxide injection"have been accomplished for C1801 old fire goaf. Meanwhile,at ZF1801 working face, comprehensive fire prevention measures, including monitoring and forecasting about spontaneous combustion, speeding up the working face mining progress, strengthening the recovery of top coal, injecting nitrogen into mine goaf by sieve tubes, blocking air leakage in two-corners, yellow mud grouting and so on, have been carried out. Through field tests of comprehensive fire prevention technologies, the results show that the O2 content in the old fire area gradually decreased to a minimum of 5%; the CO content of upper corner of ZF1801 working surface was controlled under 50 ×10-6, and the CO content decreased gradually with the CO content in return current under 20×10-6.
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