In order to prevent coal spontaneous combustion in goaf of the 102 fully mechanized caving island coal face located in 15# coal seam of Tianchi coal mine, the change law of oxygenation heating-up zone in goaf under different air supply volumes was studied according to the division standard of spontaneous combustion "three zones" in goaf, using the computational fluid dynamics software COMSOL. The scopes of oxygenation heating-up zone was determined,the fitting curve between air supply volume of working face and the width of oxygenation heating-up zone was obtained. The results showed that air leakage in goaf is the main reason for spontaneous combustion in goaf of U+I 102 caving face. The width of oxygenation heating-up zone increased with the increase of air supply volume of the working face. The concentration of CO in the 103 return air closed wall of goaf reduced from more than 20×10^-6 at the beginning to 5×10^-6 after equalizing. The field practice on the 102 fully mechanized caving island coal face showed that it is feasible to prevent spontaneous combustion of residual coal in goaf of Tianchi coal mine with the wind preventing fire technology.

full-mechanized island caving face  /  numerical simulation  /  goaf air leaking  /  wind preventing fire technology