Hydrofracturing-based method and equipment for diminishing dust and eliminating outburst of coal bed

The invention discloses a hydrofracturing-based method and hydrofracturing-based equipment for diminishing dust and eliminating outburst of a coal bed. The method comprises the following steps of: firstly, drilling a long hole towards a working surface in a return airway of the coal-excavating working surface, sealing the hole with a hole sealer for hydrofracturing and forming a hydrofractured seam in the coal rock body; secondly, adding sand into a sand mixer and conveying the mixed fluid of water and sand into the hydrofractured seam by using a mud sand pump, wherein thin sand is added first and then thick sand is added; thirdly, connecting a mash gas extracting pipeline to the hydrofractured hole, draining water through negative pressure and extracting mash gas; and finally, removing the mash gas extracting pipeline from the hole sealer, and connecting a static-pressure water-injecting pipeline for performing static-pressure water injection into the coal bed after the hydrofracturing and the mash gas extraction and stopping water injection till the water flows to the position 3 to 5m ahead of the coal wall of the working surface. By employing the expansion of the main hydrofractured seam of the coal bed, the expansion of wing-shaped branched seams and the soaking effect of the absorbed water, the structure of the coal bed is changed, the strength of the coal bed is weakened and the permeability of the coal bed is improved, so the aims of weakening the strength of the coal bed, increasing the permeability of the coal bed, eliminating the outburst and diminishing the dust are achieved.