Atomization performance of Tiantaishan tunnel spray dust reduction

In order to further improve the efficiency of spray dust removal in tunnel and obtain favorable equipment parameters, the dust removal performance of high pressure spray atomization particle size was deeply studied. Taking the dust generated in Tiantai Mountain tunnel as the research object and combining with the numerical simulation method. Based on FLUENT pressure-swirl atomization model, in this paper, the mechanism of high pressure spray dust reduction is analyzed. The pressure nozzle is simulated at 4 pressures (2, 3, 4, 5 Mpa) and 3 nozzles (2.0, 1.5, 1.0 mm in diameter). The simulation results show that when the nozzle diameter is constant, the droplet size decreases with the increase of pressure, and the atomization effect is better. When the spray pressure is constant, the droplet size increases with the increase of nozzle diameter. According to the measured results of dust in Tiantai Mountains, it is suggested that the nozzle diameter should be 1.5 mm and the working pressure should be 4 Mpa, which can reasonably and effectively settle the fine particles of dust in the tunnel.