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High-level control at sugar factories, applied to the DdS diffusion process

This paper describes a project for optimization of a DdS diffusion process at the S.F.I.R S.p.A sugar factory in Forlimpopoli, Italy. The optimization has been made by implementing an advanced control strategy in the FuzzyExpert system supplied by the Danish company FLS Automation A/S. FuzzyExpert is a product of the expert system type, which is used for process optimization in other industries, such as cement, pulp and paper, waste incineration as well as sugar factories. The paper outlines the DdS diffusion process, and describes the integration of the FuzzyExpert into the existing control system.. The structure of the control strategy is explained, emphasizing how the strategy has been divided into groups, which the operator can switch ON/OFF individually. Findings indicate that automating the diffusion process has resulted in the elimination of plug flows, 10% reduction in water use and reduction in extraction costs.