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Pulp property development Part III: Fiber residence time and consistency profile impact on specific energy and pulp properties
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, 300-307 p.Article in journal (Refereed) Published
Abstract [en]

This paper focuses on the pulp properties obtained from ThermoMechanical Pulp (TMP) CD refiners. Undersampled pulp variables are expanded into an oversampled set of process data, which makes it possible to analyze pulp properties in a dynamic time frame. It is shown that, in order to gain deeper insight into the defibration/fibrillation at a specific energy input, one needs to know the fiber residence time and the consistency profile. Moreover, the fiber residence time in the flat zone (FZ) and conical zone (CD) are intertwined with the consistency out from FZ and CD. Together with an external variable (production), these internal variables are essential for predicting the pulp properties. It is also shown that internal process conditions from different test series can be manipulated in the operating window using a low-frequency gain description obtained from an ARX model. The same mapping procedure can be applied to pulp and handsheet properties (in this paper represented by the tensile index), and this opens for implementation of new optimization routines to find more energy efficient operating points while maintaining prespecified pulp quality.

Place, publisher, year, edition, pages
2016. Vol. 31, no 2, 300-307 p.
Keyword [en]
Piecewise linear functions, Pulp quality models, TMP refiners
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-28946ISI: 000378442300016Scopus ID: 2-s2.0-84977575108OAI: oai:DiVA.org:miun-28946DiVA: diva2:974760
Note

Funding Details: Norske Skog

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

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