System and method for controlling a thermo-mechanical wood...

D - Textiles – Paper – 21 – D

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D21D 1/00 (2006.01)

Patent

CA 2564932

Thermomechanical pulp is an important process for producing fibrous mass used in papermaking. A two-level control strategy that stabilizes and optimizes the refining process has been developed. The Stabilization layer consists of a multivariable model predicative range controller that regulates the refiner line operations. The Quality Optimization layer provides the pulp quality control as measured by an online pulp quality (freeness fibre length) sensor. This control strategy leverages the natural decoupling in the process. The modular design technique is able to handle multiple refiner lines that empty into a common latency chest. A global optimizer is also used to integrate and coordinate the two layers for enhanced constraint handling.

le raffinage thermo-mécanique de la pâte constitue une étape importante de la production de masses fibreuses utilisées pour la fabrication du papier. On a élaboré un procédé à deux niveaux qui permet de stabiliser et d'optimiser ce processus de raffinage. Le niveau de stabilisation fait intervenir une unité de commande de plage prédictive à modèle multi-variables qui régule les opérations de la ligne de raffinage. La couche d'optimisation de la qualité assure le contrôle de la qualité de la pâte telle qu'elle est mesurée par un détecteur en ligne de qualité de pâte (longueur de fibre égouttée). Ce procédé de commande un effet de levier sur le découplage naturel du processus. Cette technique de conception modulaire permet de gérer de multiples lignes de raffinage qui débouchent dans un réservoir commun de latence. On utilise en outre un optimiseur global pour intégrer et coordonner les deux couches et assurer une gestion améliorée des contraintes.

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