Dust is one of the main disasters in underground tunneling. This research developed and tested a novel dust prevention technology. The technology was systematically studied in laboratory and field conditions. Based on the basic principle of Coanda effect, design the basic structure of the new dust removal device, with a small amount of compressed air as power supply and through a uniform layout on the circular hole high-speed jet for driving the center air movement together to form entrainment effect. The external dusty air is then inhaled and the dust is removed by water spray. According to variables of inlet inclination θ1, outlet inclination θ2, and the number of compressed drainage gas nozzle n. The optimal structural parameters of dust removal equipment were determined through numerical simulation and laborary experiments. The experimental results show that when the inlet angle is 15° and the outlet angle is 5°, the Conda effect is the most obvious, and the suction rate of the dust removal device is the largest. With the continuous increase of the number of gas orifices, the suction rate showed a trend of first increasing and then decreasing. Furthermore, the optimal position of spray nozzle is determined by numerical simulation. In field tests, the new technology increased respirable dust and total dust suppression efficiencies by 69.4% and 21.6%(Rear 20m of driling machine), respectively, compared to that of original dust removal device, and the new technology effectively improves the atmosphere in mechanized undergroundcoal mines, contributing to a safer and healthier working environment.

dust control,coanda effect,dust removal device,dust suppression efficiency