Dust Reduction by Water Injection into Coal Seam of Fully Mechanized Top-Coal Caving Face

The coal seam of fully mechanized top-coal caving face 1151(3) in Xieqiao coal mine of Huainan mining area is soft and loose,and is of low permeability and poor wetting condition.Aiming at this situation,we adopted the technique of water injection into coal seam to reduce the dust.Certain measures were taken in the layout of water injection holes and in hole sealing.The in situ measurement indicates that the coal moisture is increased by 2.84%,dust reduction rate of the area around coal cutter driver is 72.6%,that at the place 10 m below the coal cutter is 65.95%,and that in air return roadway is 56.8%.So the technology of water injection for dust reduction is feasible and can well solve the difficult technological problem of reducing dust in some special coal seams.