Study On Integrated Technonlgy Of Dust Suppression In Fully Mechanized Coal Face Of Dongrong Coal Mine

Mechanized mining face was the largest of producing dust capacity in coal mine, when it had been working where dust concentration was more dozens of times on even one hundred times than national health standards, which was seriously threat to the underground staffs life safety and health. So dust prevention and control of mechanized top-coal caving face has become one of the currently and difficultly problem on coal mine safety work.According to the relevant standards and requirements, field testing and laboratory analysis on characteristics and concentration and dispersion of dust about Dongrong mine extension under 18 storey South 7 of fully mechanized coal face, we had found the along distribution regularity and characteristic of concentration and dispersion of dust at fully mechanized coal face. In order to establishment of dust distribution and migration of mathematical models of gas-solid phase flow at fully mechanized coal face,we gave boundary conditions and the solution of the mathematical model to FLUENT 6.3 software, using for simulation analysis on distribution and concentration of dust when was working.Mechanism analysis on high-pressure water injection dust prevention and basis on coal seam water injection test of Dongrong mine extension under 18 storey South 7 of fully mechanized coal face, we had being numerical simulation analysis and raising reasonable pressure of coal seam water injection pressure and spacing of water injection drilling process parameters and carried out scheme of coal seam high pressure water injection, which effect of dust removing reduction rete up to 72.1% at working face. By model calculation, studing on the relationship high pressure nozzles diameter and sprary pressure between dust removel efficiency. We had a conclusion that Dongrong mine extension under 18 storey South 7 of fully mechanized coal face the reasonably pressure of dust suppression by high pressure spraying system of nozzles diameter of sprary and dust reduction system; According to the distribution characteristics of dust in fully mechanized coal face, designing and developing system and equipment of dust suppression by automatic high pressure spraying. We had carried out the system of dust suppression by automatic high pressure spraying, and got effect of dust removing reduction rete up to 81.3%.We had carried out the technology of coal seam high-pressure water injection dustfall combine with fully mechanized coal face in dust suppression by high pressure spraying in Shuangyashan mining area. which effect of total dust removing reduction rate up to93.3-94.8%. So useing this way that can effectily governance of dust of fully mechanized mining face.