Liquid CO2 injection inerting fire prevention technology on upward coal mining pillar face
The"two roadways,two lines and two corners"of the working face during the mining period of spontaneous com-bustion-prone mine are the key areas for fire prevention,in which the fire prevention of the initial mining line and the min-ing-stop line in the"two lines"is especially critical,and also weak stage of fire prevention.Changcun coal mine is now at the mining stage of remnants,and is recovering 21 coal pillar working face affected by impact ground pressure disaster,min-ing depth,roadway pressure,engineering geological conditions and other objective factors,coupled with short coal seam fire cycle and the heavy task of fire prevention during mining of working face.In light of the occurred spontaneous combustion accidents in the past during the initial mining,stopping mining,withdrawing and other periods,and taking into account the differences between the initial mining of upward coal pillar working face and the strike longwall working face,the advantages and disadvantages of injection of N2 and CO2 inerting are investigated and compared.Eventually,the new fire prevention technology of injecting CO2 is adopted,and combined with the actual conditions of mine,and the past two years of experience and practice,the CO2 injection processes have been optimized and innovated,and a set of CO2 injection fire prevention tech-nology for goaf evolved,which has played an good fire protection role in the key stages of installation,initial mining and long-term mining stop of the face,reducing the fire risk and ensuring safe production.A CO2 injection fire prevention techni-cal specification for Yi Coal Company has been formulated with wide application.
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