Research on dust control technology of pneumatic vortex spray curtain under the disturbance of ventilation system

Abstract

To solve the problem of the coal spreading pollution at the cutting head of the road-header, a numerical analysis model and a similar experimental system were established based on the complete heading face model to study and analyze the fog curtain integrity and dust control performance of pneumatic vortex spraying curtain dust control system under the disturbance of the underground auxiliary ventilation system. Simulation results have shown that the spray curtain was gradually destroyed as the pressure air volume of the auxiliary ventilation system gradually increases, when the similar pressure air volume is greater than 4 m3/min, the rotating droplet breaks away from the original motion path and diffused backward by the return air side of the roadheader. Experimental results have shown that the spray curtain was same as the simulation, because of its property of anti-interference. When the spray curtain was completed, it can achieve better dust control performance. When the pressure air volume gradually increases to 4 m3/min, the dust removal efficiency at the driver’s position can be maintained at a higher level, but the dust removal efficiency of total dust and respirable dust at 5 m behind the roadheader decreases significantly, from 97.6% and 96.4% to 89.4% and 85.8%, respectively. When the auxiliary ventilation wind speed is less than 3.3 m/s, the dust control effect of rotating spray curtain can be obtained.

Keywords

• pneumatic vortex spraying curtain
• dust control system
• atomized dust removal
• swirling jet
• heading face