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Pulp property development Part III: Fiber residence time and consistency profile impact on specific energy and pulp properties

Anders Karlström (Institutionen för signaler och system, Reglerteknik) ; J. Hill ; O. Ferritsius ; R. Ferritsius
Nordic Pulp & Paper Research Journal (0283-2631). Vol. 31 (2016), 2, p. 300-307.
[Artikel, refereegranskad vetenskaplig]

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 pre-specified pulp quality.

Nyckelord: Pulp quality models, TMP refiners, Piecewise linear functions, tmp refining processes, optimization, quality, Materials Science, helich wg, 1972, pulp and paper magazine of canada, v73, p78



Denna post skapades 2016-08-23. Senast ändrad 2016-09-14.
CPL Pubid: 240627

 

Institutioner (Chalmers)

Institutionen för signaler och system, Reglerteknik

Ämnesområden

Pappers-, massa- och fiberteknik

Chalmers infrastruktur