Abstract

This paper gives an industrial application of advanced control strategies using basic functions available in distributed control systems (DCS). The process under study is an industrial full-scale closed-loop grinding circuit where pulp solid mass fraction is to be controlled at the mill and at the cyclones. An algebraic implementation of a Kalman filter is used to evaluate the unmeasured pulp solid mass fraction at the mill discharge using mass balance relations. A static decoupler is used to eliminate the interaction between the two controlled variables. Open-loop adaptation is used to take into account the non-linearity of the process in conjunction with an internal model controller.

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