Study on the output characteristics of the pulverizing system of double-ended ball mills for flexible operation of coal-fired power plant

To address issues such as pulverizing lag and poor economic performance at low loads in the variable output process of ball-type coal mills, a mechanistic model of the ball mill was developed and validated. The study examines the output deviation and specific pulverizing energy consumption under different numbers of operating mills during load variation in coal-fired units, identifying the optimal number of mills to operate across various load ranges. The results indicate that, within the same load range, increasing the number of operating mills reduces the load on each mill. Operating the minimum number of mills necessary to meet fuel supply requirements at high loads can reduce the relative output deviation during variable output processes by 10%, thereby ensuring operational flexibility and efficiency.