Abstract In this study, the effect of the heat of wetting (Hw) of coal on its spontaneous combustion was investigated. Specifically, the effects of the amount of water used in the wetting (W), temperature (T), and particle size (PS) on the wettability and exothermic behavior of a coal sample were examined using a C600 high-precision calorimeter. The trends of the Q curves under various conditions (W, T, and PS) were analyzed. The results show that the amount of Hw decreased as T increased. The smaller the PS of a coal specimen was, the higher the amount of Hw was. Additionally, a decrease in PS led to an increase in the Hw release rate (HRR). Due to the generation and accumulation of Hw, the oxidative heat storage system of coal is promoted, which accelerates the oxidative spontaneous combustion of coal at low temperature.

中文翻译：

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润湿热及其对煤自燃的影响

摘要 在这项研究中，研究了煤的润湿热（Hw）对其自燃的影响。具体而言，使用 C600 高精度量热仪检查润湿 (W)、温度 (T) 和粒度 (PS) 中使用的水量对煤样的润湿性和放热行为的影响。分析了不同条件（W、T 和 PS）下 Q 曲线的趋势。结果表明，Hw 的量随着 T 的增加而减少。煤样的 PS 越小，Hw 量越高。此外，PS 的降低导致 Hw 释放率 (HRR) 的增加。由于Hw的产生和积累，促进了煤的氧化储热系统，加速了煤在低温下的氧化自燃。