A survey of control strategies in chemical pulp plants

A survey of the last development of control strategies in the chemical pulp industry is presented. It does not refer to the small local control loops but only reports the philosophy with which most of the control systems for the different parts of the pulping process are designed: cooking, bleaching, recovery systems. It also outlines the recent studies about control of the whole mill production. Particular attention is paid to the different control schemes, depending especially on the outputs that are chosen, as well as on the control actions. References are also made to the mathematical models of the processes, not only because they are very useful for the design of the control, but also because they are a good indication of the state of the knowledge.