Upper explosive limit of dusts: Experimental evidence for its existence under certain circumstances

An experimental study of the explosibility of cornstarch using the 20-L vessel shows that, for a narrow size fraction near its limiting particle size for explosibility, an upper explosive limit exists. Upper explosive limits were also observed with both cornstarch and Pittsburgh Standard coal dust a...

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Bibliographic Details
Published in:Combustion and flame 1993-07, Vol.94 (1), p.125-130
Main Author: Mintz, K.J.
Format: Article
Language:English
Subjects:
01 COAL, LIGNITE, AND PEAT
010600 - Coal, Lignite, & Peat- Properties & Composition
016000 - Coal, Lignite, & Peat- Health & Safety
Applied sciences
BITUMINOUS COAL
BLACK COAL
CARBOHYDRATES
CARBONACEOUS MATERIALS
CHEMICAL EXPLOSIONS
COAL
COAL FINES
Combustion. Flame
CONCENTRATION RATIO
DETONATION LIMITS
DUSTS
ELEMENTS
Energy
ENERGY SOURCES
Energy. Thermal use of fuels
Exact sciences and technology
EXPLOSIONS
FOSSIL FUELS
FUELS
MATERIALS
MATHEMATICAL MODELS
Miscellaneous
NONMETALS
ORGANIC COMPOUNDS
OXYGEN
PARTICLE SIZE
POLYSACCHARIDES
REAGENTS
SACCHARIDES
SIZE
STARCH
Theoretical studies. Data and constants. Metering
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Description
Summary:An experimental study of the explosibility of cornstarch using the 20-L vessel shows that, for a narrow size fraction near its limiting particle size for explosibility, an upper explosive limit exists. Upper explosive limits were also observed with both cornstarch and Pittsburgh Standard coal dust at low oxygen concentrations. These upper limits occur at accessible dust concentrations. A simple mechanism, “the oxygen depletion” phenomenological concept, is described. The optimum dust concentration, calculated using this mechanism, gives reasonable agreement with the experimental values, as well as explaining the variation of optimum concentration with particle size and oxygen concentration.
ISSN:0010-2180
1556-2921
DOI:10.1016/0010-2180(93)90025-X