Study on Dust Control Mechanism of Rotating Air Curtain at Full-Mechanized Face

The airflow of air curtain installed on the shearer carrys a part of dust produced by the shearer to the driver side under the entraining action. So, for further improvement on the dust-isolation effect, the authors put forward to adopt the rotating air curtain to prevent entainment dust from being carried into the driver side and enhance dust control. Through adding a short falling curtain at the roof of work face which parallels and has equal-length with air curtain, the airflow blowing out from air curtain outlet forms a rotating air curtain in the area enclosed by the roof and floor of work face, coal wall and the shearer under their attachment and the falling curtain obstruction action. The Principle and effect of dust control were analysed by theory and numerical simulation, the result shows, adding a short falling curtain at the roof of work face can improve the dust-isolation effect of air curtain.