Numerical Simulation Analysis and Prevention of Dust Emission in Downwind and Upwind Conditions of Coal Mining Face
In order to further understand the dust pollution law of coal mining face and carry out effec-tive dust prevention,based on the theory of fluid mechanics,Fluent software is used to simulate the dust emission law of cutting-moving frame under the two conditions of downwind and upwind of shearer.The re-sults show that the average wind speed of downwind in working face is larger than that of the upwind.Due to the difference of the relative position of the moving frame and the position of the variable section of the coal wall in the working face,there is a big difference in the dust distribution when the coal is cut under down-wind of upwind.When cutting coal downwind,the dust belt is located in the area around the sidewalk within 50 m of the downwind side of the shearer.When the coal is cut against the wind,the dust is concentrated in the vicinity of the drum and its downwind side of 0～45 m,and the concentration is up to 2 000 mg/m3.From the height of the bottom plate to the top plate,the pollution near the bottom plate and the top plate is more serious when the coal is cut along the wind,but the pollution range of the height of the breathing zone is small.According to the simulation results,the dust prevention and control measures of fully mechanized min-ing face combined with guide plate and shearer spray rod(block)are put forward to achieve the purpose of ef-ficient dust suppression.
NETL
NSTL
万方数据
