Study on flame features of coal dust explosion under coordinated role of mixed coal qualities

In order to study the flame of coal dust explosion under the coordinated role of different coal qualities, a level glass tube experiment device was applied t 0 study the flame length features and the flame sustained time features of the mixed coal quality dust explosion.The results showed that when the anthracite coal mixed with the lignite, the lignite with a percentage of 45% in quantity would play a coordinated explosion role to the anthracite coal. The flame feature fluctuation sensitive zo ne of the mixed coal dust explosion was determined and this type explosion was a " reversed coordinated explosion". The fat coal, lean coal and lignite mixed explosion would be the type explosion. In the features curve of the long flame coal and lignite mixed explosion, there would be a " wave crest" occurred and was occurred by the surface active free radical of the mixed coal dust molecular increased. This type explosion was a " forward coordinated explosion".The anthracite coal could play a restr ained flame development role to the lean coal, fat coal and long flame coal. The lean coal and anthracite coal mixed would have a flame longer than the fat coal and ant hracite coal, but the flame sustained time would be short and this was due to partial oxygen shortage cause the flame fractured too early.