In order to find the relation between air leakage volume of goaf and temperature of residual coal

the relevance of air leakage volume to the temperature of residual coal was studied by using the methods of theoretical analysis and numerical simulation.The process of residual coal spontaneous combustion was studied by using the method of numerical simulation—taking a working face of Wulong mine as an example.The relations between the air leakage volume of goaf and the air supply of working face and the temperature of residual coal were analyzed

and the equations of function were obtained.The results show that with the temperature increasing of residual coal

the air leakage volume of goaf becomes larger.The increase of the air leakage volume of return is larger than the increase of air leakage volume of inlet gradually.The relationship between the air leakage volume and the temperature of residual coal is a parabolic function.The concept of relative change rate of the air leakage volume is given

and the relationship between it and temperature of residual coal is a logarithmic function.Other influencing factors are mentioned

and the influences of the other factors must be considered when the temperature of residual coal is forecasted.