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Continuous online fibre analysis enables improved pulp quality estimation and control
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Holmen Paper.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.ORCID iD: 0000-0003-1881-6473
2022 (English)In: Proceedings of the International Mechanical Pulping Conference, 2022, p. 99-106Conference paper, Published paper (Other academic)
Abstract [en]

In this work, high-rate fibre analysis has been used for direct feedback control of pulp quality by application of a new control strategy for a two-stage refining process in the Holmen Hallsta mill, Sweden. The application is based on control of pulp freeness, estimated from the continuous fibre analysis results from a BTG Single Point Morphology ana-lyzer. The goal was to create a robust and simple control strategy. The new strategy includes control of plate gap, con-sistency and the hydraulic force difference between the stages. Expressed as standard deviation, the freeness and av-erage fibre length variations were reduced by 50% and 25% respectively. The small size of the pulp chest in this process also benefits stronger feedback control. Long-term operation suggest that high-rate fibre analysis can be used to reduce faster quality variation.

Place, publisher, year, edition, pages
2022. p. 99-106
Keywords [en]
Mechanical pulping, Refiner, Control, Online fibre analyser, Pulp quality
National Category
Wood Science
Identifiers
URN: urn:nbn:se:miun:diva-47686OAI: oai:DiVA.org:miun-47686DiVA, id: diva2:1739783
Conference
IMPC 2022, Vancouver, BC, Canada, June 5-8, 2022
Available from: 2023-02-27 Created: 2023-02-27 Last updated: 2023-02-27Bibliographically approved

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Sund, JohanSandberg, ChristerThungström, GöranEngstrand, Per

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