Abstract
ABSTRACT During a mining-stopped period, coal spontaneous combustion (CSC) may occur in a gob area, which not only causes huge economic losses but also poses a serious threat to the mine’s production safety. To address this situation, a working face in the Chinese Silaogou Coal Mine was considered as an example. With a combination of numerical simulation and field temperature measurements, the spatiotemporal distribution of the temperature in a longwall gob was determined, and the area of potential spontaneous combustion was identified. Furthermore, a dry-ice rapid sublimation unit used for underground fire prevention was developed. The device was successfully applied underground to exert the effect of low-temperature carbon dioxide gas to reduce the coal temperature. The results show that the temperature of the mined-out area near the air intake side of the working face is significantly higher than that of the return side, and the longer the stopping time is, the more obvious the temperature difference is. Within 12 hours of using the generator to inject carbon dioxide, the observed temperatures of the two hot spots dropped from 26.1°C and 26.6°C to 19.1°C and 19.8°C, respectively, and the temperatures hardly rebounded after stopping the gas injection, effectively suppressing the heat storage and oxidation of the coal.
Published Version
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