tyeps of bowl mills in ntpc
2015 1 3 NTPC Seminar Report | Turbine | Boiler. Bowl mill is a medium speed mill with 30 rpm speed. It pulverizes coal to a size of 200 microns with a purity of 600 micron. Bowl mills are available in varying capacities ranging from 1.7 to 100 tons per hour.A 200 MW unit uses 6 mills of 32 tons per hour capacity, out of which 4 5 run at