Experimental study on heat-pipe cooling technology of spontaneously combustible gangue hills under the influence of ambient temperature

In view of the spontaneous combustion problem of gangue hills in Danaoliang Coal Mine, based on the technical principle of passive cooling of heat pipes, the experimental groups of group tube were set up in the fire zone and heat storage area, and the temperature at different depths was monitored in real time for 10 months to explore the treatment effect of group pipes in different temperature zones under the influence of ambient temperature. The results show that the cooling rate in the cold season of the fire area is faster, the cooling rate of the warm season is slower. The overall cooling trend is continuous, and the cooling rate can reach 14% to 36%, the treatment effect is obvious. The internal temperature of the heat storage area is greatly affected by the ambient temperature. The group tube shifts heat quickly in the cold season, and the cooling effect is better. Under the action of the low temperature difference in the warm season, it still has a certain effect of inhibiting the heating.