Aspects fondamentaux de la propagation de flamme dans les mélanges air-poussière

Abstract : The history of the development of the process industry has been punctuated by a number of hazardous explosions, sometimes very severe. A few of them are still in the memory and have certainly contributed to the birth of safety engineering. It has been known for more than a century that combustible dusts suspended in air have been partially responsible for such explosions but unlike gas explosions, the available knowledge and practices still seem to contain a significant part of empiricism. The work summarised in this article is an attempt to contribute to a better understanding of the explosion mechanisms of dust clouds. The core of the discussion pertains to basic flame propagation mechanisms. It has been discovered over two decades that for a number of combustible particles, the combustion processes in the flame show strong similarities to those of premixed gaseous flames. In particular, the propagation is driven by heat transfer through thermal conduction. However, for a class of particles, such as metal dust, thermal radiation may be strongly at work as well, modifying very significantly the propagation mechanisms in a way that has received little attention until now. This may appear as a burning question in the emerging world of“nanoparticles”, since the smaller the particles the larger this influence…
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Christophe Proust. Aspects fondamentaux de la propagation de flamme dans les mélanges air-poussière. Rapport Scientifique INERIS, 2007, 2006-2007, pp.64-66. ⟨ineris-01869092⟩

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