What is a dust deflagration?

A dust deflagration refers to a combustion phenomenon that occurs at subsonic speeds. In the context of dust explosions, this type of combustion happens when particulate materials, often finer than a specified size, are dispersed in the air and ignite. The rapid oxidation results in a pressure wave that travels through the air and the combustible dust cloud, but it does so at speeds slower than the speed of sound within the reacting medium.

Understanding that deflagration is characterized by its relatively slower propagation speed compared to detonation is essential. In contrast, a detonation would involve combustion at supersonic speeds, which is not the case with deflagrations. Thus, recognizing the distinction between the two types of explosions helps in the context of industrial safety and hazard management, particularly when dealing with combustible dust in various environments.