In search for excellence!

There are few studies in which the actual mill dynamics ranging from fractions of a second up to months are penetrated based on information from (C)TMP. Using a control concept to stabilize the refiner operation makes it possible to derive a complete plant model comprising, (C)TMP, power plant and board (paper) machines for further energy efficiency studies. The possibility to implement new robust models for plant follow up invites the industry to search for more efficient and innovative process strategies. However, it lies an inherent difficulty to optimize product quality to minimized electricity cost (and carbon dioxide emissions) as many ways to approach “right” quality exist. To reach energy efficient operating points a deeper understanding of the refining process, in a more holistic perspective, is sometimes required as it can be directly linked to economic values.

The control concept provided is based on a model for a complete refiner, including process descriptions for the inlet zone, the refining zone and the outlet mixing zone. All models are based on physical considerations. The model helps you to optimize the process operating window. By conducting a survey after the implementation of required measurements and soft sensors we offer all important services to improve your process operating economy.

So far we have shown that the modeling and control strategy deliver reliable results and that a 20-30% reduction in specific energy in a CD82-refiner is possible to obtain without violating the pulp properties studied. In Twin-refiners the modeling and control strategy makes it possible to control the consistency individually in the parallel refining zones.

For further reading, please download "Refiner optimization and control Part 1: Fiber resi..."