Method and means for controlling an electrolysis cell

G - Physics – 05 – B

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G05B 13/04 (2006.01) C25C 3/20 (2006.01)

Patent

CA 2704551

Method and means for controlling an electrolysis cell for aluminium production by process control inputs, comprising means for measurement of one or more process variable(-s) where the measured value(-s) is led to an estimator. The estimator can be of the Kalman filter type, and estimates the current value of one or more process variable(-s) followed by prediction of the value of said process variable(-s) and/or other process variable(-s). The predicted value(-s) is used to calculate future input control scenario by means of a calculator. The prediction of the process variable(-s) is performed in accordance with a non -linear dynamic model being an integrated part of a process controller.

L'invention concerne un procédé et des moyens pour commander une cellule électrolytique pour la production d'aluminium par des entrées de commande de processus, comprenant des moyens pour mesurer une ou plusieurs variables de processus, où les valeurs mesurées sont présentées à un estimateur. L'estimateur peut être du type filtre Kalman, et il estime la valeur courante d'une ou plusieurs variables de processus, suivie de la prédiction de la valeur desdites variables de processus et/ou d'autres variables de processus. Les valeurs prédites sont utilisées pour calculer le scénario de commande des entrées futures au moyen d'un calculateur. La prédiction des variables de processus est effectuée suivant un modèle dynamique non linéaire faisant partie intégrante d'un contrôleur de processus.

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