Multi-indicator feature extraction and temperature prediction model for spontaneous coal combustion and oxidation.

Among them, the concentrations of O 2 , CO, CH 4 , CO 2 , C 2 H 4 and C 2 H 6 , a total of six single gases, showed a trend of slow change to rapid growth in the process of coal temperature rise, which can effectively identify the gas release characteristics of the critical temperature, the dry cracking temperature and the pre-spontaneous combustion period, while the gas release characteristics of CO/△O 2 , CO/CO 2 , CO

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