Distribution of spontaneous combustion"three zones"in goaf of 6315 working face of Tangkou Coal Mine
In order to determine the risk range of spontaneous combustion of abandoned coal in goaf of 6315 working face of Tangkou Coal Mine,and analyze the distribution range of"three zones"under different conditions,this paper takes fully mechanized goaf as the research object,and adopts PFC particle flow numerical simulation software and FLUENT flow nu-merical simulation software to establish mathematical models of oxygen concentration and flow rate in three-dimensional space in fully mechanized goaf.The internal flow field and gas concentration that cannot be directly observed inside the goaf are calculated,and it is concluded that the"three zones"of spontaneous combustion in the goaf of Tangkou Coal Mine 6315 face,when the working surface length of fully mechanized mining is about 190 m,are as follows:on the air inlet side,the dispersion zone is 0～75 m,the oxidation zone is 75～88 m,and the suffocation zone is 88 m～∞;On the return air side,dispersion zone:0～35 m,oxidation zone:35～89 m,suffocation zone:89 m～∞.
goafspontaneous combustion"three zones"overlying rock collapseporosityoxygen concentration
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