UNDERGROUND COAL MINING METHOD Russian patent published in 2010 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: method involves preparation of extraction area by performing opening and preparation workings; drilling of degassing wells and their integration into degassing network of the well; preliminary degasification of the developed coal beds with delivery of methane-air mixture via degassing network with degassing vacuum pump installed at pump station to the surface; combustion of methane-air mixture in boiler furnace and production of coal from degassed beds. In cases when concentration of methane in methane-air mixture is inadmissibly low for transportation and combustion of methane-air mixture in boiler furnace, additional vacuum pump is installed at the pump station, which includes degassing network of the well parallel with degassing vacuum pump; at that, capacity of additional vacuum pump is taken smaller than that of degassing one.

EFFECT: due to additional pump it is possible to continue the degassing process, not allowing methane emissions to atmosphere, which increases the coal production efficiency and decreases ecological stress in coal-mining region.

1 dwg