Abstract
Dust explosions in the process industries have prompted the need for better understanding of dust explosion fundamentals to improve risk assessments. Parameters such as Pmax, Kst and MIE are important to the risk assessment process and depend on dust size, shape, chemical composition etc. Studies often cited particle size (median diameter, d50) as a crucial parameter. However, d50 does not provide information regarding size distribution span (polydispersity), which effects the explosion parameters.This study investigates five aluminum powder blends with similar d50 and varying polydispersity to demonstrate the weighted mean diameter D (3,2) is a better statistic to associate with MIE. This study highlights the importance of reporting polydispersity, D (3,2) along with d50/median to properly assess the particle size distribution of the dust for accurate explosion risk assessment.
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