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identifierclassificationmetisididentifierbibliographiclatitude longitude publisherrelationrelationtyperightssourcetypeformatsetuuid filenamesPOptimal control of the dissolved oxygen concentration in an airlift-loop reactor2Zwietering, M.H.; Verlaan, P.; Krolikowski, A.K.M.'Nutrition; Chemical Operations - Mathematical Models; Control Systems, Discrete Time - Design; Control Systems, Optimal - Design; Oxygen - Concentration; Yeast - Production; Digital Control; Dissolved Oxygen Concentration; Bioreactors; Computer Techniques; Process Optimisation; Reactors-AirliftrA model to describe the oxygen transfer in an airlift-loop reactor (ALR) is developed in order to build an optimal digital control algorithm for the dissolved oxygen concentration. Thereafter the model is discretized in place and time resulting in a set of linear difference equations. These equations are used to implement an optimal linear discrete control algorithm. The discrete controller has as an advantage a wider application and can be used with more measuring and control points in comparison with a PID controller. Moreover, the optimal control parameters can be predicted and do not have to be revealed empirically as in the case of a PID controller. The resulting optimal discrete controller has been tested in a pilot plant ALR (0.165 m3) and compared with a PID controller. In all cases tested the discrete controller acted comparably with the PID controller. 1992.1992en2318856Instituut voor Graan, Meel en Brood Mededeling nr. 653series2Computers and Chemical Engineering, 6, 16, 563-572articletno
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