Optimal spray system designs for continuous miner dust control.
Advances in the Prevention of Occupational Respiratory Diseases, 1998 Jul; :1-9
Water sprays are the most widely-used technology in the coal mining industry for limiting worker exposure to respirable dust. They control exposure by suppressing airborne dust, influencing airflow patterns to keep personnel in clean air, and wetting coal surfaces to prevent airborne dust generation. Optimal spray system design depends upon the proper balance of these three mechanisms. Worker exposures to coal and silica dusts have been reduced by water sprays strategically mounted on the continuous mining machine. These sprays have been placed above and below the cutting boom, in the loading shovel, and along the sides of the continuous miner. When a flooded-bed type scrubber is used for dust control, sprays must be used with caution to avoid inducing airflow beneath the cutting boom which can result in decreased scrubber efficiency. In practice, water sprays have been positioned near the scrubber inlets to contain the dust cloud, thus improving capture of a dust. A high level of effectiveness has been attained in continuous miner dust control, although serious non-compliance can result from the improper application of water spray technology. This paper summarizes past research plus laboratory and in-mine studies with water sprays for effective continuous miner dust control.
Coal-mining; Underground-mining; Dust-control; Respirable-dust; Miners; Mine-workers
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, Pittsburgh, PA 15236
Chiyotani-K; Hosoda-Y; Aizawa-Y
Advances in the Prevention of Occupational Respiratory Diseases, Proceedings of the 9th International Conference