Effects of Modified Formulations and Inerting Measures on Dust Explosion Propagation of Powder Coating

This study investigates the effects of modified formulations (particle size, aluminum flake addition) and inerting measures (oxygen reduction) on the explosion propagation of coating powder by using visual experiments. We found a direct correlation between reduced particle size, the addition of aluminum flakes, and increased explosion risk. While reducing the oxygen content effectively slows flame propagation and combustion rate, its influence is modulated by particle size and composition. Notably, smaller particles exhibit slower flame propagation under low-oxygen conditions. The addition of aluminum flakes accelerates combustion, requiring a lower oxygen content for effective inerting. Our comprehensive evaluation of combustion rates suggests an oxygen concentration below 15% for optimal inerting.