Optimization on parameters of long distance forced and short distance exhausted ventilation system in mine rock heading roadway

In order to reduce the dust harm occurred in a mine roadway heading,based on a mine rock roadway heading face as a study object,Fluent software was ap plied to optimize parameters of a long distance forced and short distance exhausted ventilation system in a mine rock heading roadway. The results showed that a dust con trol effect of the long distance forced and short distance exhausted ventilation system applied in the underground mine roadway could be improved by 30% ~ 50%,which w as higher than the forced type ventilation system and the dust quantity and concentration at a place with a distance of 20 m to the mine roadway heading face was reduced below 20 mg 1 m3.An optimized width and height were 0. 6 m and 0.8 m was obtained for a hood lock of the dust collection hood with the application of the numerical simul_ ation and in combination with the site test. The site test showed that a height of a negative pressure air duct in the ventilation system of the mine heading roadway was opti mized as 2 m and could further improve the dust collection efficiency of the system.