Two basic phenomenological models for deflagration propagation in dust clouds are discussed as the basis for interpreting explosion suppression results. The first model is based on oxygen diffusion to fuel dust particles as the controlling step in explosion propagation through a dust cloud. The second model assumes explosion propagation is controlled through fuel particle volatilization followed by combustion in the gas phase.
With this scientific framework as the basis, the inhibition aspects of explosion suppression are discussed to provide guidelines for industrial dust explosion mitigation. As part of the analysis, experimental results are presented for organic, inorganic and hybrid high Kmax dust explosions and dust explosion suppression.
Inorganic dusts fuels included aluminum, and silicon. Organic fuels in the experiments were Pittsburgh coal, cornstarch, polyethylene, anthraquinone, calcium stearate, cadmium stearate, and cornstarch w/propane. Extinguishing agents used in the experiments were sodium bicarbonate, potassium bicarbonate, mono-ammonium phosphate and calcium carbonate.