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Calibration of a polyethylene plant for grade change optimisations

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Author

Summary, in English

A polyethylene plant model coded in Modelica and based on a nonlinear MPC model currently used at Borealis AB is considered for calibration. A case study of model calibration at steady-state for four different operating points are analysed, both when looking at one operating point separately, but also to calibrate several simultaneously. Both model parameters and reactor inputs are calibrated for true plant measurement data. To solve the parameter estimation problem, the JModelica.org platform is used, offering tools to express and solve calibration problems. Calibration was obtained with narrow confidence intervals and shows a potential to improve the model accuracy by changing the parameter values. The results will be used for dynamic optimisations of grade changes.

Publishing year

2011

Language

English

Pages

673-677

Publication/Series

21ST European Symposium on Computer Aided Process Engineering

Volume

29

Document type

Conference paper

Publisher

Elsevier

Topic

  • Chemical Engineering
  • Control Engineering

Keywords

  • Calibration
  • Modelica
  • grade change
  • cheical industry
  • polymerisation

Conference name

21st European Symposium on Computer Aided Process Engineering, 2011

Conference date

2011-05-29 - 2011-06-01

Conference place

Chalkidiki, Greece

Status

Published

Research group

  • LCCC

ISBN/ISSN/Other

  • ISSN: 1570-7946
  • ISBN: 978-0-444-53895-6