Technology of Spontaneous Combustion Prevention and Control During Withdrawing Period in Lower Layered Coal Mining Face

In order to control the hidden danger of spontaneous combustion caused by secondary oxidation of residual coal, air leakage and other issues during the withdrawing period in lower layered coal mining face, take No. 2134 lower layered coal mining face in Beimafang Coal Mine as a study object. The analysis results sho wed that the residual coal heating and oxidation, CO emissions in the goaf of No.2114 higher layered coal mining face, which caused the CO concentration abnormal. T hrough taking comprehensive fire preventing and extinguishing technologies with positive pressure ventilation in the coal mining face, grouting in the goaf of higher laye red coal mining face, grouting polymer gel fire prevention materials through boreholes behind the supports and others, the development of natural oxidation and heating was inhibited, the CO concentration was decreased to 100 x 10- 6and keep stable.