Effect of Precompression and Explosion Volume on the Explosion Indices of Mixtures of Coal Dust and Air

摘要

Explosion behavior of coal dust in the case of precompression of the dust/air mixture between 0.5 to 2.5 atm was investigated in an explosion chamber. The most important result of a series of tests is that the explosion range is partly changed to a considerable extent by different precompressions. In particular, it has been found that at normal pressure the maximum limit of the concentration range in which explosion occurs is increased. In contrast to this overpressure and underpressure narrow the range of an explosive dust/air mixture at the upper ignition limit. In the case of a decreased explosion volume (by using a smaller explosion chamber) explosion energy is considerably reduced by the chamber wall. As a result of a smaller volume, the optimum reaction and ignition limits of raised dust are displaced to higher dust concentrations. 6 refs., 17 figs. (ERA citation 10:052267)