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Evolution of explosion risk of powders by characteristics of maximum explosion pressure and rate of explosion rise.
I. Expansion of explosion in gas suspension

H.Vasileva,
 
† V.G. Tokhtuev,
 
O.Neikov
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
odneiko@gmail.com
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2021, #09/10
http://www.materials.kiev.ua/article/3348

Abstract

The features of powder explosion propagation in closed equipment and equipment with explosion venting are considered. A near proportional dependence of maximum explosion pressure from initial pressure value in closed vessels is observed. The increase of ignition delay from lowest value 0.3 sec to about 1 s results in marked decrease of maximum rate of pressure rise, whereas the maximum explosion pressure is comparatively independent for the ignition delay. Transition mechanisms from laminar combustion to turbulent combustion and following acceleration of powder flames up to detonation speed are considered. This characteristic phenomenon occurs by powder inflammation in technological equipment and flame front propagation in attached to equipment long exhaust duct with dispersion of sediment dust by blast wave.


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