Abstract
Frictional ignitions are defined as the rapid oxidation of a mixture of methane and air with a visible flame that could last from a few seconds to several minutes. These ignitions have a potential to turn into a mine explosion and eventually a large-scale mine fire. Over twenty-two years (1983–2004) US coal mines have had 1,566 frictional ignitions. There were no fatalities, but serious injuries have occurred. Every effort, therefore, should be made to prevent frictional ignitions. The preventative measures fall under four categories: (a) degasification of coal seams prior to mining, (b) adequate ventilation, (c) wet cutting or water-jet assisted cutting, and (d) machine design to minimize ignitions. The chapter discusses each of these techniques in detail. Frictional ignition of coal by belt conveyors is also reviewed.
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