Abstract
ABSTRACT Three fractions of wheat and grain sorghum dust were tested at five concentrations for explosibility. Explosibility of one lignite dust fraction was determined as a reference. Parameters determined were minimum explosive concentration, minimum ignition temperature, maximum pressure, and maximum rate of pressure rise. Minimum explosive concentration tests demonstrated that currently accepted minimum explosive concentrations are lower than actual concentrations required for propagation of an explosion. Differences between maximum pressure and maximum rate of pressure rise for primary and secondary chambers demonstrated that a secondary explosion occurred in the secondary chamber. Since residual dust was not initially present in the secondary chamber, fuel for the secondary explosion had to have been transported by the pressure front from the primary chamber. This event demonstrated that residual dust is not essential for occurrence of secondary explosions. KEYWORDS. Grain dust, Explosibility.
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