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Dust Suppression With Water Sprays During Continuous Coal Mining Operations.

Emmerling-JE; Seibel-RJ
NTIS: PB 245 562 :12 pages
The federal Bureau of Mines investigated dust suppression obtained with three different water-spray nozzle systems during underground continuous coal mining at the face. The nozzles were the "regular" nozzles normally used by the mine, and high-efficiency and low- efficiency nozzles selected on the basis of an airborne capture theory of respirable dust by spray drops. The high-efficiency nozzle used one-third less water than the others throughout the testing. Results depended on the type of cutting operation at the face. The sump-downshear operation appeared to involve a significant amount of capture of airborne respirable dust. The same amount of dust was measured when using the high-efficiency and regular nozzles. The dust levels when using the high-efficiency nozzle were about 20 pct less than those measured when using the low- efficiency nozzle. The sump-upshear operation seemed to involve a predominance of other aspects of dust suppression, such as impaction of spray drops onto the face. Compared with the downshear operation, there was a significant reduction in dust levels for a total face operation when using the regular nozzle; dust levels when using the regular nozzle were about 15 pct lower than those measured when using the high-efficiency nozzle.
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NTIS: PB 245 562
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division