Research on Fire Prevention and Extinguishing Technology During the Shutdown and Withdrawal Period of Fully Mechanized Top-Coal Caving Face

To ensure safe equipment withdrawal from the 15102 fully-mechanized top coal caving face during production suspension at a coal mine, a comprehensive four-phase fire prevention strategy was developed based on precise delineation of spontaneous combustion "three zones" and thorough hazard analysis. The implemented measures included: ventilation system optimization with gas extraction adjustment, low-temperature nitrogen injection into goaf, 15-meter corner grouting for air leakage sealing, fire-retardant injection between supports with rear-side sealing, targeted retardant injection in abnormal zones, and continuous goaf monitoring. During the critical withdrawal period, all key gas indicators remained within safety limits without any spontaneous combustion incidents, enabling safe, efficient single-cycle equipment retrieval. These results provide valuable technical references for fire prevention in similar mining conditions.