Minimum Extinguishant and Maximum Oxygen Concentration for Extinguishing Coal Dust-air Explosions.
Grumer-J; Miller-LF; Bruszak-AE; Dalverny-LE
NTIS: PB 223 877 :6 pages
In addition to nine powder and gaseous extinguishants of propagating Pittsburgh seam coal dust-air explosions earlier evaluated, 10 other powders have similarly been evaluated under like conditions such that wall quenching of the coal dust-air flames was virtually absent and the dust concentration was temporally and spatially uniform to within about +/-5 percent. None of the newly examined extinguishants was better than purple-k (potassium bicarbonate). The maximum oxygen concentration for the extinguishment of otherwise uninhibited coal dust explosions and the influence of coal dust particle size and the volatile content of the coal were also explored. For the present, the choice of the inhibitor among the good ones evaluated is not as critical as the system to be used to deploy the extinguishant against a coal dust explosion.
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 223 877