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Refining efficiency for future CTIVIP and TMP systems co-optimizing fundamental wood material knowledge with a soft sensor control approach
Chalmers University of Technology, Göteborg.
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kemiteknik.ORCID-id: 0000-0003-1881-6473
2016 (Engelska)Ingår i: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, s. 304-316Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Internal variables in (C)TMP-refining processes (e.g. temperature, consistency, fiber residence time, backward flowing steam and forces acting upon the chips and pulp) are defined as physical states obtained in different parts of the refining zones. In short, they differ from the traditional external variables (e.g. dilution water feed rate, load and gap distance) which are not available as distributed variables from refining zone measurements. The internal variables are the backbone of physical models and such models can be used for on-line implementation of soft sensors and advanced process control. Of special interest are the temperature and consistency profiles together with fiber residence time, which are the internal variables in focus of (in) this study. Moreover, they are directly linked to pulp and handsheet property development. To illustrate the capability to use a modeling strategy, two examples are given; one where it is shown how to reach a 40% reduction in specific energy in a CD82-refiner using a new control strategy without violating the pulp properties studied and one example where the consistency can be controlled individually in two parallel Twin refining zones. Hence, the article comprises both temperature and consistency control to reach optimal process conditions.We believe that increased fundamental understanding of the role of the spatially dependent viscosity in refining in general will be a key factor to find ways to further improve energy efficiency of refining.

Ort, förlag, år, upplaga, sidor
TAPPI Press, 2016. s. 304-316
Nyckelord [en]
CTMP, Energy efficiency, Fiber residence time, Fiber-to-bar interaction, Modeling, Motor load distribution, Pulp consistency, Temperature profile
Nationell ämneskategori
Kemiteknik
Identifikatorer
URN: urn:nbn:se:miun:diva-29838Scopus ID: 2-s2.0-85006333272ISBN: 978-151083073-8 (tryckt)OAI: oai:DiVA.org:miun-29838DiVA, id: diva2:1063159
Konferens
International Mechanical Pulping Conference 2016, IMPC 2016; Jacksonville; United States; 26 September 2016 through 28 September 2016
Tillgänglig från: 2017-01-09 Skapad: 2017-01-09 Senast uppdaterad: 2017-02-07Bibliografiskt granskad

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Engstrand, Per

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