Experiment and Numerical Simulation of High Temperature Region Distribution for Coal Pile Containing Water

In order to study the distribution characteristic of location of high temperature region during coal pile spontaneous combustion, the unsaturated heat transfer mathematical model of coal pile containing water was established. Then the numerical simulation was used to compare the high temperature region position between coal pile containing water and dry coal pile, and the location of high temperature region distribution of three kinds coal pile for high water level, middle level and low level is calculated. The results show that the heat dissipation area, spontaneous combustion area and high temperature inside the lower-middle part of coal pile are formed from the surface to the interior. Due to slow evaporation, the deep part is not combustion easily and the high temperature region can develop forward to dry part reverse the windward side; the higher the water, the closer the high temperature zone is to the surface. According to this conclusion, the experiment was carried to verify it, and the results between them meet well, hence, the safety management of coal fields should consider the moisture content of coal piles to predict the location of spontaneous combustion.