COAL MINE VENTILATION SYSTEM AND DEVICE FOR METHANE RECOVERY FROM MINE AIR (VERSIONS) Russian patent published in 2017 - IPC E21F5/00 E21F1/00 

FIELD: mining.

SUBSTANCE: ventilation system comprises at least three air ducts, clean air flows through one of the forced draft air ducts, wherein forced draft canopy area considerably exceeds the air duct section. The mine air containing concentrated methane is extracted through the second air duct connected to device for methane recovery from the mine air and mounted at the highest points of the coal heading, wherein the exhaust canopy area considerably exceeds the duct section. The contaminated mine air is extracted through the third air duct, which is mounted at the lowest points of the coal heading. The air ducts spread from the working face to the ground surface. Gasproof partitions are mounted on the ceiling portion along the full length of excavation transversely to the longitudinal direction. Air balloons filled with incombustible gas are attached to the coal heading ceiling with cords, wherein the air balloons are heavier than methane but lighter than the air. Sensors fixing the air balloons height level are mounted at level of gasproof partition lower part, designed to transmit a command for increasing or decreasing the drawing speed of the mine air containing methane and to discharge the clean air. Device for methane recovery from the mine air, flowing from the mine, comprising a sealed tank, air balloons filled with incombustible gas are attached to its ceiling part, wherein the balloons are heavier than methane but lighter than the air. Sensors fixing the air ballons location level are mounted at level of the middle part and higher, designed to transmit a command for increasing or decreasing the drawing speed of methane/air enriched in methane. The air duct feeding the mine air flowing from the mine and comprising a large number of methane is mounted at level of the middle part and lower.

EFFECT: prevention of explosions due to accumulation of methane-air mixture under roof with the possibility of subsequent concentration of methane-air mixture for further use.

7 cl, 5 dwg