Abstract: To improve the efficiency of spray dust reduction and improve the traditional sprays, a newtype of air-water spray dust-reduction system was proposed. The relationship between atomization perform-ance parameters, such as droplet size , spray distance and atomization angle, and air-water flow rate wereanalyzed by experiments, and the range of air-water flow parameters for optimal atomization effect was determined. By establishing a similar model of tunneling roadway, the variation of dust-reducing efficiencyof air-water nozzles under different conditions is studied. The results show that the dust removal efficiencyof gas-water nozzle decreases with the increase of the wind speed, and increases first and then decreaseswith the increase of water flow rate. The higher the gas flow rate is, the higher the dust removal efficiencyis. The dust removal effect is best when the elevation angle of nozzle installation is 30°. According to theactual situation of the site , the curtain air-water spray device is designed. The average dust removal ef.ciency of respirable dust in driving face is more than 70% , and the good dust removal effect is achieved.

Key words: roadheader, gas-water spraying, dust reduction