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Model based control and optimization of  continuous digester
Mälardalen University, School of Sustainable Development of Society and Technology. (PRO)
Mälardalen University, School of Sustainable Development of Society and Technology. (PRO)ORCID iD: 0000-0002-7233-6916
2008 (English)In: TAPPSA JournalArticle in journal (Refereed) Published
Abstract [en]

Continuous pulp digesters are large reactors with significant residence time. They play a critical role in shaping the pulp qualities achieved at the product-end.  For this reason, there is a big drive towards developing fundamental dynamic models to be used for better process understanding and control (especially in the development of model based controllers).

In this paper we discuss the use of physical models for diagnostics and process optimization of a continuous digester.  

 

Accurate diagnostics are not possible without the use of a pressure-flow net. The pressure-flow net also makes it possible to validate pressure and flow sensors in the circulation around the digester.  For control purposes however, the pressure-flow net is not so important.

 

Two dynamic physical models were built for a continuous digester, one with a pressure-flow net and one without.  The model without the pressure-flow net has been tuned and tested with good results at Ngodwana mill.  It was not possible to get the model which included  the pressure-flow net running with as many digester section blocks as we wanted due to the he system becoming stiff. However, for a lower number of sections results were obtained. With an adjustment of the boundary conditions, higher number of sections should be possible to test as well.

Place, publisher, year, edition, pages
2008.
Keywords [en]
modelling, simulation, on-line, digester
National Category
Paper, Pulp and Fiber Technology
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-8004OAI: oai:DiVA.org:mdh-8004DiVA, id: diva2:293126
Projects
KKS Use of statistical and physical models for on-line applications...Available from: 2010-02-10 Created: 2010-02-10 Last updated: 2014-01-07Bibliographically approved

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http://www.tappsa.co.za/archive3/Journal_papers/Continuous_Digester/continuous_digester.html

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Dahlquist, Erik

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf