Improving Check Curtains, Line Curtains and Extensible Face Ventilation Systems.
Muldoon-TL; Bartlett-PT; Schroeder-WE
NTIS: PB/83-216242 :112 pages
A fieldworthy 10-ft extensible brattice to maintain a 10-ft setback was found in use in two mines on continuous miner faces. The technique was evaluated in the laboratory for leakage and methane control at the face. Significant results include the following: (1) air leakage through a gap in the extensible curtain depends upon the ratio of the cross-sectional areas between entry and return as well as gap area, (2) gap shape has no significant effect on methane concentrations at the face--increasing gap area diminishes ventilation effectiveness, and (3) substantial reductions of ch4 concentrations at the face were accomplished by brattice extensions with gaps up to 5 ft2 in area. An inby hook, inserted in the roof automatically to make possible the deployment of a longer brattice extension in the context of a remotely controlled miner, was tested in various roof types. Insertion of this design succeeded only in coal.
CP; Final Contract Report;
NTIS Accession No.