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Overview of dust explosibility characteristics.

Authors
Cashdollar-K
Source
J Loss Prev Process Ind 2000 May; 13(3-5):183-199
NIOSHTIC No.
20020625
Abstract
This paper is an overview of and introduction to the subject of dust explosions. The purpose is to provide information on the explosibility and ignitability properties of dust clouds that can be used to improve safety in industries that generate, process, use, or transport combustible dusts. The requirements for a dust explosion are: a combustible dust, dispersed in air, a concentration above the flammable limit, the presence of a sufficiently energetic ignition source, and some confinement. An explosion of a fuel in air involves the rapid oxidation of combustible material, leading to a rapid increase in temperature and pressure. The violence of an explosion is related to the rate of energy release due to chemical reactions relative to the degree of confinement and heat losses. The combustion properties of a dust depend on its chemical and physical characteristics, especially its particle size distribution. In this paper, the explosion characteristics of combustible dusts will be compared and contrasted with those of flammable gases, using methane as an example. These characteristics include minimum explosible concentration, maximum explosion pressure, maximum rate of pressure rise, limiting oxygen concentration, ignition temperature, and amount of inert dust necessary to prevent flame propagation. The parameters considered include the effects of dust volatility, dust particle size, turbulence, initial pressure, initial temperature, and oxygen concentration. Both carbonaceous and metal dusts will be used as examples. The goal of this research is to better understand the fundamental aspects of dust explosions.
Keywords
Dusts; Explosion; Combustibility; Combustible-materials; Methanes; Explosion-prevention; Explosive-dusts; Aerosols
Contact
Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, PA, USA. Tel.: +1-412-386-6753, Fax.: +1-412-386-6595
CODEN
JLPIE9
Publication Date
20000501
Document Type
Journal Article
Email Address
kgc@cdc.gov
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Issue of Publication
3-5
ISSN
0950-4230
NIOSH Division
PRL
Priority Area
Control Technology & Personal Protective Equipment; Research Tools and Approaches
Source Name
Journal of Loss Prevention in the Process Industries
State
PA
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