Abstract: In order to study the law of spontaneous combustion of coal left behind and the “three belts” distribution range in goafs under the conditions of Y-type ventilation method (supported by soft-membrane wall along side roadway) and high-level drainage roadway in the goaf of No. 3 coal seam in Gaohe Coal Mine, the advance Prediction of Coal Spontaneous Combustion in Goaf. By arranging the bundle tube monitoring system on the working face, the gas is analyzed by gas chromatograph in the goaf area, and the concentration changes of gases such as O2, CO, CO2, CH4, C2H2, C2H4, C2H6 are analyzed, and these factors are taken into consideration to divide the goaf spontaneous combustion "three belts" range. The scope of the “three belts” was finally determined. On the intake side: heat dissipation zone: 0~45m; oxidation temperature rise zone: 45~135 m; asphyxiation zone: greater than 135 m. At the return side: heat dissipation zone: 0~20m; oxidation temperature rising zone: 20~43 m; suffocation zone: greater than 43 m. The monthly advance speed is greater than 70.8 m/month. The practice shows that it is very consistent with the actual situation of the working face, and prevents spontaneous combustion in the goaf, and provide effective technical guidance for fire prevention and extinguishing of the W1310 working face.

Key words: Spontaneous combustion "