HIGHLIGHTS
SUMMARY
Under the background of mining-induced underground coal fire hazards, the following four elaborates on the combustion mechanism of underground coal fires, multiphysics coupling in the combustion affected area of coal seams, prevention and extinguishing technology of underground coal fires, and the innovative use of beneficial utilization technology of underground coal fires have been mainly conducted. Li believed that free_radicals generated in the process of molecular cracking of coal promoted the oxidation and spontaneous combustion of coal, and proposed the hypothesis of free_radical interaction. Other scholars investigated the changes of coal molecular structure in . . .
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