Analysis on the Effect of Truck Mounted Spray Based on the Dissipation Law of Dust in Transportation Process
In order to improve the problem of high-concentration dust generated in the transportation process of open-pit iron mine,theoretical analysis and numerical simulation methods were used to analyze the atomization effect by simulating the dust dissipation law under different vehicle speeds and designing a truck mounted spray dust suppression system.The results show that when the vehicle speed is 10 km/h,the dust will move towards the rear and upper part of the truck at a low airflow intensity and a low operating speed.The maximum concentration position of dust in the transportation process is at the friction point between the tire and the ground,with a dust mass concentration of 985 mg/m3.When the vehicle speed increases to 30 km/h,dust will dissipate from the inside to the outside around the truck,with a dissipation range of 5 m.The dust mass concentration increases to 1400 mg/m3,and the maximum dust mass concentration in the breathing zone will reach 224 mg/m3.The height of dust at the rear of the truck is 1.5 m.Compared to low vehicle speeds,the higher the vehicle speed,the faster the dust will dissipate.Based on the dissipation law of dust in transportation process,the simulation analysis of the atomization effect of different spray parameters confirmed that the middle pressure nozzle has the best atomization effect when the pressure was 3 MPa,the atomization angle was 60°,and the nozzle diameter was 1.0 mm.The droplet size was 7.42 μm,which could simultaneously ensure the capture of total dust and dust in the breathing zone.
Dust in transportation processDissipation lawDust concentrationDroplet sizeTruck mounted spray dust suppression system