Constrained multivariable control of a wood chip refiner - Transfer screw speed adjustments linked to design flexibility

TitleConstrained multivariable control of a wood chip refiner - Transfer screw speed adjustments linked to design flexibility
Publication TypeJournal Article
Year of Publication1998
AuthorsDu, H., and G. A. Dumont
JournalPulp & Paper -Canada
Volume99
Pagination47-50
Date PublishedAUG
Type of ArticleArticle
ISSN0316-4004
Keywordsadaptive systems, Algorithms, CHIPS, control systems, controllers, design, process variables, REFINERS, thermomechanical pulping
Abstract

This paper presents the design of a constrained multivariable adaptive controller for a wood chip refiner in the thermomechanical pulping (TMP) process. The control algorithm is based on Generalized Predictive Control (GPC) with consideration for the constraints on process variables. The control objective is to maintain two output variables - refiner motor load and blow-line consistency - at their setpoints by adjusting three manipulated variables: transfer screw speed, refiner hydraulic pressure and dilution flow-rate. Computer simulations are presented to demonstrate the advantages of the proposed control algorithm.

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