DEVELOPMENT OF DUST-PREPARATION EQUIPMENT FOR DOMESTIC AND FOREIGN ENERGY

Abstract

The article presents technical proposals for calculating the maximum grinding capacity of medium-speed mills using an equation based on the practice of operation of medium-speed mills, the eff ect of which is confirmed by comparing the calculated results with experimental data, and the development of technical proposals for static and dynamic separators for medium-speed mills designed to isolate the finished product from the milled cement clinker. Besides, development is considered of a series of powerful mill fans with a capacity from 60 to 120 t/h, equipped with state-of-art inertial separators, providing finer fuel grinding in comparison with previous models, which in its turn reduces approximately to a half the losses due to incomplete combustion of fuel and, accordingly, leads to an increase in the boiler efficiency. In addition, an inertial separator of a new design with a two-stage scheme of return of partially ground fuel is described and illustrated. A new solution for installation of guide fuel ducts in the inlet branch of the mill fan is also considered. This provides a multilevel supply of fuel to the rotor blades with uniform distribution of the specified fuel along the width of the branch pipe, which has considerably extended the service life of grinding elements of mill fans. The practical record of operating mill fans of TPP «Honsha» (Laos) developed according to technical documentation by Russian specialists is also described. The article describes a modern design of the developed small-sized separator made for the purpose of improving the quality of finished coal dust and explosion safety of hammer mills. It is based on the technology of classification of separators of mill fans. The practical record of operation of this separator on boilers of «Gusinoozerskaya» GRES is presented, as well.