Experimental Study on Wall Temperature and Heat Transfer Characteristics of Gravity Heat Pipe by Heat Input Power and Working Materials

With the rapid development of the coal industry, the possibility of spontaneous combustion of coal in the process of mining, storage and transportation has gradually increased. Coal in the pile state is very easy to lead to the occurrence of coal spontaneous combustion disaster because of the good heat storage environment and ventilation conditions. In order to study the impact regulation on the heat pipe heat dissipation effect under different heat source input power conditions, the working performance of the heat pipe is investigated by using methanol working material and no working material as a contrast. The experiments were conducted to determine the suitable working heat source environment for the gravity heat pipe by comparing and analyzing the wall temperature of the gravity heat pipe under different heat source input power as well as the use of the working material. The results show that the copper-methanol gravity heat pipe can best control the temperature of the heat source location to continue to rise, destroy its heat storage environment, and suppress the self-heating of the coal pile. The heat dissipation effect of the copper-methanol gravity heat pipe at the heat source input power of 75 W. It shows that different working materials have corresponding working environment. This experimental study is conducted to be able to destroy the self-heating environment of coal in the process of piling, which has certain guiding significance for the improvement of coal pile spontaneous combustion prevention technology.