Quenching Behavior of Coal Dust-Air Mixtures

摘要

The quenching behavior of coal dust-air flames was investigated. The literature relevant to coal dust-air flames was reviewed, including information on the agglomeration, sedimentation, and dispersal of dust clouds. The simple equations relating the various concentrations involved in dust flame propagation are given, and their implications are elaborated. It is shown that the concentrations seen a moving flame in a sedimenting dust cloud can differ significantly from the concentration commonly measured in such experiments. The known dust cloud phenomena that appeared significant in flame propagation studies were experimentally evaluated, and quenching diameters, flame speeds, and lean propagation limits of several tube diameters were measured.