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Mitigating coal dust explosions in modern underground coal mines.
Harris ML; Cashdollar KL; Man C-K; Thimons E
Mine Ventilation: Proceedings of the Ninth International Mine Ventilation Congress, New Delhi, India, November 10-13, 2009. Panigrahi DC, ed., New Delhi, India: Oxford & IBH Publishing Co. Pvt. Ltd., 2009 Nov; 1:143-149
The National Institute for Occupational Safety and Health (NIOSH), as part of its continuing research program for evaluating coal dust explosion hazards, has investigated several areas in which current practices may need to be updated in order to adequately protect mines against coal dust propagated explosions. In the United States, current rock dusting requirements remained largely unchanged since 1969. US Title 30 Code of Federal Regulations Section 75.403 is based on a coal dust particle size survey performed in the 1920s and later was supplemented by full-scale testing of the rock dust ability to inert a coal dust explosion. NIOSH recently conducted a comprehensive survey of US underground coal mines to determine the range of coal particle sizes found in dust samples collected from the mine entries. Due to advancements in technology and modern coal mining techniques, the current coal dust particles in intake airways are significantly finer than those found in the mines in the 1920s. According to past full-scale dust explosion test results, the current rock dusting practices used in today's mines to inert a coal dust explosion may not be adequate. Other closely related issues such as rock dust testing methods and sampling procedures are discussed.
Coal-dust; Coal-miners; Coal-mining; Coal-workers; Control-technology; Dust-measurement; Dust-particles; Dust-sampling; Engineering-controls; Explosion-protection; Explosions; Mine-seals; Mining-industry; Particle-aerodynamics; Particulate-dust; Underground-mining; Author Keywords: Explosion; coal; mining; coal dust; rock dust; particle size
Marcia L. Harris, NIOSH - Pittsburgh Research Laboratory, P.O. Box 18070,626 Cochrans Mill Rd. Pittsburgh, PA 15236
Mine Ventilation: Proceedings of the Ninth International Mine Ventilation Congress, New Delhi, India, November 10-13, 2009