Application of Dust Control Parameter Optimization in Excavation Working Face of Coal Roadways with High Gas and Large Air Flow
To solve the problem of the difficult dust control in the excavation working face of coal roadways with high gas and large air volume,combined with the site ventilation conditions of Zhangcun mine,the CFD numerical simulation was used to study the dust distribution character-istics and the dust distribution law under different dust control parameters.The results show that the dust distribution in the roadway was affected by air supply factors.The dust at the front gathered on the opposite side of the air supply duct,the dust in the middle gathered on the left side of the roadheader,and the dust at the rear was high on the left and low on the right,high on the top and low on the bottom.When the dust extraction duct was 3 m away from the head,and the air outlet of the two air supply ducts was 4 m and 5 m from the head,respectively,the dust extraction and reduction effect was optimal.Field measurements showed that after applying the optimal dust control parameters,the total dust removal efficiency of reached more than 93%,and the respiratory dust removal efficiency reached more than 90%,which effectively solved the diffi-culty of dust management in the large-air-flow excavation working face.
excavation working facenumerical simulationair extraction ductdust purification