Dust Control Studies Using Scale Models of Coal Mine Entries and Mining Machines.
NTIS: PB 262 736 :20 pages
Three scale models of coal mine entries and mining machines were constructed by the Bureau of Mines to study the effects of ventilation parameters on dust concentrations where mining personnel would be working. A one-fifth-scale model of a coal mine entry with a drum-type continuous-mining machine and a one-sixth-scale model of an entry with a twin-borer-type machne were used as well as a one- fifth-scale model of a longwall face with a double-drum shearer. Methane was used as a tracer gas to stimulate respirable dust in the models. The distance of the end of the brattice or tubing from the face was found to be more important than the airflow rate for the drum-type machine. Dust reductions greater than 90 pct were shown to be possible with a secondary ventilation system used with the twin borer and a dust collector mounted on the longwall shearer. Cutting-head speed ahd a significant effect on concentrations at typical positions of miners with the drum-type machine and longwall shearer but not for the twin borer.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 262 736