Model Predictive Midrange Control of the Moisture Content in Paper Production, 2007 TAPPI Papermakers and PIMA International Leadership Conference

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Traditionally the moisture controller only manipulates the steam pressure set point of one dryer group (the lead group) and this makes it single-input-single-output control. From evaluations of a recently developed model, it is shown that by dividing the dryer section into two parts, each with its own lead group (two-input-single-output control), moisture variations in the final product can be reduced by midrange control.

The model is a nonlinear dynamic model for the dryer section. It is implemented in the object-oriented modeling language Modelica and is compared with measurements from a fine-paper machine.