Stereo Fire Protection Technology for Large Angle Rotation Multilayer Coal Face

The Wu_9-10-16070 fully-mechanized face in No.7 coal mine of Pingmei shares is large angle rotation multilayer coal face,in which there are many kinds of spontaneous combustion factors,including much float coal in gob,special slow speed of the advancing,etc.Through careful analysis of spontaneous combustion factors at working face,stereo fire protection technology was adopted that contained spraying retardant before support,drilling on support and injecting MEA fire prevention agent,burying pipe after support and injecting water,fixing point burying pipe in goaf oxidation zone and injectng nitrogen,moving point dragging pipe and injecting nitrogen,which effectively prevented the spontaneous combustion in goaf.