METHOD FOR UNDERGROUND GASIFICATION OF COAL Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: increase efficiency of gasification due to more optimal delineation of district and consideration of its hypsometry on districts of complex geological and mining conditions, boundaries of gas generator are outlined along tectonic dislocations with a break in continuity with amplitude of more than two thicknesses of gasified seam, washouts, wedging outs and districts with ash content in excess of 40%. Line of lighting up is prepared along the most deep boundaries and coal is gasified to the rise. In case of presence of plicative dislocations, additional lines of lighting up are prepared along axes of synclines. Parts of seam with thickness less than 3 m or limbs of dislocations with a break of continuity are gasified after injection and crystallization of saltpeter. EFFECT: higher efficiency. 2 cl, 1 dwg