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Characteristics and Risk Assessment of Flame Spreading Over Metal Dust Layers  

Han, Ou-Sup (Risk Management Research Institute)
Publication Information
Korean Chemical Engineering Research / v.43, no.1, 2005 , pp. 47-52 More about this Journal
Abstract
The wide use of metal dusts have been found in industrial field and many dust explosion accidents occur by fire spread of dust layer. In this study, we developed a new experimental device to examine fire and explosion characteristics of the dust layer. Aspects of the burning zone over metals(Mg, Zr, Ta, Ti, etc) and PMMA(Polymethyl methacrylate) dust layers have been investigated experimentally to clarify behaviors (Spread rate and quenching distance) and effects of $N_2$ surrounding gas on the fire spread over metal dust layers. From the experimental result, it was found that the spread rate of metal dusts is larger than PMMA, the dependability of spread rate over the thickness of dust layer is small, and the minimum oxygen concentration of spread flame over Mg dust layer is 3.6-3.7 vol%. Since high correlation between the spread rate and the reciprocal of quenching distance was seen, relative risk prediction in those inflammable parameters can be predicted.
Keywords
Dust Layer; Dust Explosion; Flame Spread; Quenching Distance; Spread Rate;
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