Analysis Of Flow Of Wet Dust Removal System And Study On Dust Removal Efficiency In Fully Mechanized Excavation Face

The fully mechanized excavation face is the main dust producing point in the coal mine.Dust pollution causes serious harm to the health and safety of underground workers and the use of equipment.Therefore,it is extremely important to carry out research on the optimization of equipment parameters in the tunnel to reduce the hazards of dust pollution.In this paper,based on the use of wet dust removal methods,the wind flow field,dust field and spray droplets field of the fully mechanized excavation face are studied through theoretical analysis and numerical simulation,and the correlation in the roadway is analyzed through the control variable method and linear regression analysis.The parameters were optimized and analyzed,and the promotion effect of the dust removal fan and the wall air duct on the dust suppression in the roadway was also analyzed through experimental measurement.This paper uses Solidworks to establish a simplified geometric model according to the actual situation in the tunnel,and uses ICEM to complete the unstructured meshing of the geometric model.Uses Fluent to perform numerical simulation analysis on the movement of dust and spray droplets in the tunnel,and uses CFD-POST performed a visual post-processing analysis on the solution results,and analyzed and summarized the movement laws of wind flow field,dust field and spray droplets field in the roadway.In order to explore the influence of spray pressure on the dust movement in the roadway,the spray pressure is selected as 3Mpa,5Mpa,8Mpa,and 10 Mpa to perform numerical simulation respectively.Through comparative analysis,when the spray pressure is 5Mpa,the overall discrete phase concentration of the roadheader driver is the lowest.Optimize the position of the suction duct.The comparative analysis results show that when the distance between the suction duct and the cutting surface is 5 meters,the position of the suction duct is the optimal parameter;the position of the air pressure outlet duct is optimized and analyzed,and the comparative analysis results show that When the distance between the air pressure outlet duct and the cutting surface is 19 meters,it is the optimal parameter for the position of the air pressure outlet duct;the optimized analysis is carried out for the position of the wall air duct,and the comparative analysis results show that the distance between the wall air duct and the cutting surface When it is 26.5 meters,it is the optimal parameter of the wall air duct position.The linear regression analysis method was used to analyze the effect of the position parameters of the suction duct,the air outlet duct and the wall air duct on the concentration.The results showed that the suction duct significance> the air outlet duct significance> the wall air duct significance;at the driver of the roadheader,The three parameters all have a positive effect,and the position parameter of the suction duct has the greatest influence;at the suction port of the suction duct,the position parameter of the suction duct and the position parameter of the air outlet duct have a negative influence,while the position parameter of the wall air duct is positive.Influence,and the position parameter of the suction duct still has the highest influence.Experiments in coal mine tunnels have been conducted to verify the effect of dust removal fans on the ability of dust suppression in the roadway.The results show that the dust removal fans have a good promotion effect,and the dust removal efficiency is higher than 90%;the wall air duct also has the same effect on the dust suppression ability in the roadway.Better promotion effect,dust removal efficiency is 69% to 90%.