Numerical simulation of dust generation at different procedures in steeply inclined fully-mechanized caving face

In order to master the regularities of dust concentration distribution and variation at different working procedures in steeply inclined fully-mechanized caving face,and obtain rational parameters for the design of dust removal by ventilation,based on the theory of gas-solid two-phase flow,this study investigates the dust movement in the process of cutting coal,moving supports,caving coal at steeply inclined fully-mechanized caving face,set the dust source parameters at different working procedures according to the analysis results.Subsequently,the regularities of dust concentration distribution and air speed in 3D working face are simulated using Fluent.The simulation results are compared with field measured data.The results indicate that the simulation results are essentially coincident with the measured data.Dust diffusion distance in steeply inclined fully-mechanized caving face is much greater than that of gentle inclined face.The optimal dust exhausting wind speed is 2.6 m/s due to simulation results,the dust concentration of driver location is about 650 mg/m3,and it could keep in 300 mg/m3 in shearer leeward 20 m location.Combining ejector spray filter at hydraulic support with nozzle installation,the field test indicates that this method can obviously improve the dust removal efficiency of caving coal.