Temperature Variation on Coal Gangue Dumps under the Action of Heat Pipe: Case Study on Yinying Coal Mine in China

Abstract Coal gangue in long-term accumulation will often appear spontaneous combustion phenomenon. Generally, the disaster caused by it has always been one of the serious problems threatening the health of residents in the mining area. Master the regularity of deep temperature distribution and eliminate the internal heat is an effective method to control the spontaneous combustion. In this study, using the self-developed heat pipe (HP) and intelligent cloud monitoring software, three groups of single pipe experiments were carried out in different temperature areas of the coal gangue dump in Yinying Coal Mine, to analyze the internal temperature variation under the action of HP. The results show that the temperature is obviously restrained by the HP, and the average cooling range reaches 21.44% within 700h. However, the temperature of the control group without HP continued to rise by 8%. In the three groups of experiments, the effective control radius of single HP is 3m. When the depth of gangue is 1 ~ 4m and the temperature between 90 ℃ ~ 450 ℃, the cooling effect is the best. It revealed that the HP had a substantial effect on thermal removal and inhibited spontaneous coal gangue combustion. In addition, this paper provides a theoretical basis for the HP treatment of spontaneous combustion coal gangue dumps technology.