Opening and Safety Resume Production Technology for Sulphur Coal in Fully Mechanized Caving Face

Based on the mining technology and high-sulfur coal characteristic in 031601 working face of Laoshidan Coal Mine, the causes of spontaneous combustion in working face are analyzed. Through nitrogen grouting in three measure holes of the centralized transportation tunnel, filling liquid nitrogen in fire sealing hole of intake airway and return airway of 031601 working face, gas composition and concentration, temperature and other indicators in the closed areas meet the opening conditions of the working face, and the closed areas can be opened and resumed. Considering the special situation of 031601 working face passing through the fault before the closure, the uniform pressure ventilation is developed for the working face. Comprehensive technical measures, including spontaneous combustion monitoring in goaf, building curtain nitrogen injection system, liquid CO₂ injection emergency system, colloids injection in measure hole, spraying retarder in goaf, supplementing roadway in return airway, plugging leakage channels, are used to guarantee the resume production and achieve a smooth mining of 031601 working face.