Refining Efficiency for Future CTMP and TMP systems - Co-optimizing Fundamental Wood Material Knowledge with a Soft Sensor Control Approach, 2016 International Mechanical Pulping (IMPC) Conference

Internal variables in (C)TMP-refining processes (e.g. temperature, consistency, fiber residence time, backward flowing steam and forces acting upon the chips and pulp) are defined as physical states obtained in
different parts of the refining zones. In short, they differ from the traditional external variables (e.g. dilution water feed rate, load and gap distance) which are not available as distributed variables from refining zone measurements.

The internal variables are the backbone of physical models and such models can be used for on-line implementation of soft sensors and advanced process control. Of special interest are the temperature and consistency profiles together with fiber residence time, which are the internal variables in focus of (in) this study.  Moreover, they are directly linked to pulp and handsheet property development. 

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