A Comparison of Methane Flow Patterns on Advancing and Retreating Longwalls.
Cecala AB; Konda BW; Klinowski GW
Soc Min Metall and Exploration Wilton Company 1989 :484-490
Methane ignitions continue to be a major concern to the longwall mining industry. In spite of numerous advances in technology over the past decade, there has not been a measurable reduction in the number of longwall face ignitions. It is necessary to know methane liberations, emissions, and flow patterns in order to effectively deal with it and to design control technology to reduce the occurrence of longwall face ignitions. A cooperative research project between the U.S. Bureau of Mines and the Canada Centre for Mineral and Energy Technology (CANMET ) has been established to address longwall methane problems. The initial direction of this work was to look at methane flow patterns during the entire longwall mining process, and more specifically to examine and compare methane levels and flow patterns for advance and retreat longwall mining is practiced in the sydney coalfields in nova scotia. In 1986, a study was performed on advancing longwall panels at the lingan colliery, and a similar study was recently completed at the phalen colliery on a retreating panel. Methane monitors were placed at various locations along the face, intake, return, and bleeder airways. Handheld methane monitors were also used upstream and downstream of the shearer mining machine. The results from both studies are reported, and the differences between the two longwall mining methods are compared.
Soc. Min., Metall., and Exploration, Wilton, Co, 1989, PP. 484-490