Tangential hammer mills are designed for grinding up to a pulverized condition (fine milling) and simultaneous predrying of bituminous coal and lignite in the coal pulverization systems at thermal power plants. The mill can operate both under vacuum and under pressure up to 1000 kgf/m2. A distinguishing feature of the mill is intensive forced ventilation combined with an increased peripheral velocity of the rotor enabling the high quality of grinding and good drying.

The mill consists of a housing with a frame, a rotor, a separator, radial and thrust bearings, elastic coupling and electric motor. The material to be milled and a drying agent are fed into the mill tangentially. Process of grinding is performed by means of repeated impacts of material by beaters and against the housing, and also by means of material detrition during its movement through the clearance between the housing liner and running rotor of the mill. The drying-ventilating agent carries the milled coal away from the milling zone into the separator, where large fractions are separated and returned into the mill for additional grinding. The finished pulverized coal is moved through the pulverized-coal ducts to the boiler burners.