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The characteristic of duplex inlet and outlet ball mill system is analyzed.Mechanism model of a pulverizing system is established to estimate raw coal moisture.Optimization of outlet temperature is designed considering raw coal moisture.An extended state space predictive controller is designed for the pulverizing system.Kalman filter and predictive controller cooperate to achieve stable control effect.
This study analyzes the dynamic characteristics of duplex inlet and outlet ball mill direct firing pulverizing system. A mass and energy balance-based model is built by thermodynamic analysis. As a critical parameter in pulverized coal humidity control, coal moisture is considered in the mechanism model, and an extended Kalman filter is designed to estimate the coal moisture. A multivariable control system is designed using extended state space predictive controller. The dynamic characteristic of the mill can be effectively forecasted using the established model. The system can rapidly track unit load changes while reducing the disturbance caused by coal moisture and other outlets.