Explosion Experiments on a Babcock HS Beater Mill with Centrifugal Classifier and Raw Coal Feed

摘要

On behalf of Deutsche Babcock AG, Oberhausen, a HS beater mill with a capacity of 5 t/h with centrifugal classifier and raw coal distributor was subjected to dust explosion testing. In a first series of experiments in which the grinding plant was merely pressure relieved via pulverized coal pipes, it was found that in principle, higher levels of reduced explosion pressure were observed in the distributor than in the mill itself. The distributor was destroyed in the end at a pressure of 2.6 bar. When a specific relief system was mounted on the distributor in a second series of tests, the distributor was subjected to less pressure than the pulverizer itself. Furthermore, explosion pressures overall were reduced in comparison with the first series of tests. From the data, conclusions are drawn concerning recommended pressure pulse resistance of HS beater mills. (ERA citation 10:008242)