The Research on Design Parameters of Fan Mill Direct Pulverizing System

In this paper, the desiccant medium choice, desiccant medium composition and main design parameters (calculation of the oxygen content of the coal mill export, coal mill outlet temperature, calculation of coal moisture, coal fineness, air leakage coefficient of the system, primary air velocity of mill export) of direct-fired system of fan mill are analyzed in detail. To choose the composition of dry medium, unit should be considered in different conditions, and calculate the oxygen in the mill outlet powder mixture to make it consistent with the requirements of inert atmosphere when using direct system of fan mill. At the same time, mill pulverizing system calculation should meet the design requirements: the volume content in the export of oxygen calculation is not more than 12%, the final temperature t2 in mill exports is selected as 150  C, coal fineness is selected as R90, air leakage coefficient of the system is selected as 0.3(accounting conditions are 0.1 or 0.2), and primary air velocity of mill export is from 17 m/s to 19m/s.