Rotormill ApplicationsDrying and grinding system for algae for the making of jet fuel. This is IPEC's Model 1300 and it displays a gas heater, Model 1300 Rotor Dryer, dust collector,.dryers on pulverizers,Coal Plant O&M: Coal Drying Reduces Pulverizer Start-up CostsJan 1, 2007 . . coal-drying process in a pulverizer is similar to that used by flash dryers. Certain coals should be preheated to make them more combustible.