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Pulp property development Part II: Process non-linearities and their influence on pulp property development
Chalmers University of Technology, Göteborg.
QualTech AB, Tyringe.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 2, 287-299 p.Article in journal (Refereed) Published
Abstract [en]

It is shown in this paper that knowledge of the spatially measured temperatures inside the refining zone in TMP refiners is essential in describing non-linear dynamics of high consistency refining. By expanding the pulp and handsheet properties using piece-wise linear functions into the time domain, an auto-regressive model can be applied to verify that the tempera-ture and the consistency profiles, in combination with the motor load and production rate, are key input candidates when modeling changes in different pulp properties. The model accuracy is analyzed using process information captured at different time and operating conditions. It is also shown that it is more complex to estimate and validate the tensile index than the mean fiber length and Somerville shives content, especially close to refiner operating limits where a shift in the process gain may occur. This type of switched dynamics in tensile index estimation at a specific consistency is related to non-linear behaviors where the fiber pad distribution most likely undergoes a local collapse.

Place, publisher, year, edition, pages
2016. Vol. 31, no 2, 287-299 p.
Keyword [en]
Fiber distribution, Fiber network, Pulp quality, Refining models, System identification
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-28939ISI: 000378442300015Scopus ID: 2-s2.0-84977493495OAI: oai:DiVA.org:miun-28939DiVA: diva2:974795
Note

Funding Details: Norske Skog

Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2016-12-09Bibliographically approved

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