Coal Mill Control and Optimization Using a Multilayer Structure

Ball mill coal pulverizing system is a multiple-input multiple-output (MIMO) process characterized with strong couplings and nonlinearities. Conventional control methods maybe work well initially, but will deviate from optimal work point for a period of time and even cease to be functionally effective. A multilayer structure with direct control and optimization is presented for the control of ball mill coal pulverizing system. The novelty of the strategy lies in that a static model is developed to identify the relationship between input/output variables and disturbances, and then optimal set-points can be determined for the MIMO controller. The proposed approach can maintain stable, safe and economic operation of ball mill, and is readily available to the industrial engineer. Simulation results demonstrate the effectiveness of the control strategy.