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Inhibition of Coal Dust-air Flames.
NTIS: PB 203 662 :14 pages
Nine dust and gaseous inhibitors of propagating coal dust-air flames (lean, stoichiometric, and rich) were evaluated in a newly developed 15-cm-id, 3.6-Meter-long instrumented flame duct, under conditions such that wall quenching was virtually absent and the dust concentration was temporally and spacially uniform to within about +/-5 percent. Listed roughly in order of increasing efficiency, the inhibitors evaluated were rock dust (calcium carbonate), powdered oyster shells (calcium carbonate), halon 1301 (trifluorobromomethane), halon 1211 (difluorochlorobromethane), sodium chloride, super-k (potassium chloride), regular-grade fire extinguishant powder (sodium bicarbonate), purple-k (potassium bicarbonate), and monnex (potassium bicarbonate combined with urea). Experiments were extended to clouds containing 1 and 2 volume- percent of methane. The inhibition of lean, stoichiometric, and rich methane-air flames without coal dust was also examined in a few instances; results agreed with those obtained for coal dust-air flames.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 203 662
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division