Study on the effect of heat pipe filling rate on the internal temperature field of high temperature coal pile

In order to study the influence of the heat pipe filling rate on the heat dissipation performance of heat pipe and the temperature field of the high temperature coal pile, the changes of the temperature field inside the high temperature coal pile inserted into heat pipe was studied by experimental methods. In the temperature range of 75℃ to 25℃, the cooling rate of high temperature points inside the coal pile under the condition of heat pipes with different liquid filling rates was analyzed, the effect of heat pipe on the internal temperature field of coal pile was studied. The research results show that the heat pipe can effectively destroy the heat storage environment inside the coal pile, and its effect can be divided into three stages, namely, a substantial cooling stage, a transition stage, and a stable stage; the liquid filling rate has a significant effect on the heat transfer performance of the heat pipe, when the liquid filling rate of the heat pipe is 40%, the maximum cooling rate of the high temperature point inside the coal pile is 9.92℃/h, followed by 10% and 30%, and the heat transfer capacity of the heat pipe is the worst when the liquid filling rate is 20%; the influence of heat pipe on the temperature field of the three horizontal planes inside the coal pile is significantly different. In the upper and middle horizontal planes, the heat transfer mainly depends on the heat pipe wall, and in the lower horizontal plane, the heat transfer mainly depends on the phase change heat transfer of the working medium of heat pipe.