Coal Dust Explosibility and Particle-Size Distribution

摘要

An absorption/desorption model of particle reactivity was employed to describethe observed relationship between two apparently diverse phenomena which have been the subject of considerable study at the U.S. Bureau of Mines, viz. (1) coal/rock dust relfectance and (2) coal/rock dust explosibility. A mean particle size parameter, appropriate to the explosion extinction process, is derived, and then taken as appropriate to describing optical reflectance. The derived form-to-function relationships for the two processes, when compared with experimental data, suggest that a problem exists with previously derived theory relating optical reflectance to rock dust concentration. A reexamination of that theory leads to a new theoretical expression, changed by a factor of two, for the variation of rock dust concentration with reflectance which is in quite good agreement with experimental results. The current work offers justification for measuring and establishing rock dust requirements for specific coal dust size distribution(s) found in the mine-distributions which undoubtedly depend on the mining method and the type of coalbed.