Fire Area Treatment Technology of Shallow Depth and Close Distance Coal Seam Group in Large Goaf

The coal seams of Bulianta Coal Mine are liable to spontaneous combustion. It has the features of shallow depth and close distance, the area of goaf is very large. When the fire occurs, the damage degree is serious, and the governance difficulty is big. The comprehensive treatment measures are taken in the overlying goaf fire area of 22305 fully mechanized mining face, which include the ventilation system adjustment, fire source detecting, temperature measuring of mine surface-underground, plugging of mine surface-underground, drilling and pouring the colloid on the ground, three-phase froth and fly ash, liquid N₂ and liquid CO₂ injection through the ground drill, these measures ensure smooth mining for the working face.