Truck road transport is one of the largest sources of dust in open-pit coal mines.Dust pollution seriously damages the health of occupational groups in coal mines and affects the visibility of truck drivers.Wet spraying is an effective method to solve road dust pollution from the root of dust production,and the spraying process parameters directly determine the dust control effect and its economic cost.Using the truck road surface operation in the northern coal mine of Holin River as the research background,FLUENT19.2 software was used to establish a truck road spray dust reduction model;numerical simulations were conducted to analyze the impact mechanisms of nozzle incidence angle,nozzle aperture and spraying volume on road dust concentration.The results show that:truck road dust particles are mainly produced under the action of crushing,centrifugal throwing and induced airflow,concentrated on the side and rear of the wheels;the collision coupling between droplets and dust particles increases the water content of dust particles,which is conducive to reducing the dust generation load,and in order to make the spray fog scale have a good coverage of truck road dust,the best angle of incidence between the nozzle and the ground is determined as 30°.While the nozzle aperture of 10 mm,the Stokes collision coefficient is the highest.The best pavement dust control was achieved by maintaining a truck pavement water spray volume of 0.15 L/m2 and a pavement soil water content of 4.0％.The findings of the study provide a theoretical basis for achieving effective dust control on trucking surfaces in open pit coal mines.
open pit coal minetruck roaddustdual side line spraynumerical simulationoptimal parameters
万方数据
维普
