INSTALLATION FOR PREPARATION OF PULVERIZED COAL FUEL Russian patent published in 1999 - IPC

FIELD: preparation of pulverized coal fuel at thermal power stations. SUBSTANCE: the installation consists of a group of mills, whose quantity in each group is not less than two. All mills in a group have similar diameters of drums, but different their lengths and diameters of the mouths, the mouths are made for interchangeability in a row. The ratio of mill drum lengths to their diameter is within 0.3 to 1.2. The armor plates are of the same standard size. All mills are furnished with drives of the same type designed for the most powerful mill of the group. The degree of mill drum filling with balls is constant and may make up 0.28 to 0.30 of their capacity. The drum rotary speed is constant and may not exceed 0.8 to 1.0 of the critical one, the mill capacity may be calculated by formula. EFFECT: enhanced capacity, reduced specific expenditures, improved maintainability, reduced specific quantity of metal per structure and power intensity. 4 cl, 1 dwg