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Calibration of a polyethylene plant for grade change optimisations

Andersson, Niklas LU ; Larsson, Per-Ola LU ; Åkesson, Johan LU ; Haugwitz, Staffan and Nilsson, Bernt LU (2011) 21st European Symposium on Computer Aided Process Engineering, 2011 In 21ST European Symposium on Computer Aided Process Engineering 29. p.673-677
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Calibration, Modelica, grade change, cheical industry, polymerisation
in
21ST European Symposium on Computer Aided Process Engineering
volume
29
pages
673 - 677
publisher
Elsevier
conference name
21st European Symposium on Computer Aided Process Engineering, 2011
external identifiers
  • wos:000294218900135
ISSN
1570-7946
ISBN
978-0-444-53895-6
language
English
LU publication?
yes
id
c315b0d6-c86b-4b7b-9d92-563a4dc16d4f (old id 2158453)
date added to LUP
2011-09-16 11:18:55
date last changed
2016-09-23 15:15:16
@inproceedings{c315b0d6-c86b-4b7b-9d92-563a4dc16d4f,
  abstract     = {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.},
  author       = {Andersson, Niklas and Larsson, Per-Ola and Åkesson, Johan and Haugwitz, Staffan and Nilsson, Bernt},
  booktitle    = {21ST European Symposium on Computer Aided Process Engineering},
  isbn         = {978-0-444-53895-6},
  issn         = {1570-7946},
  keyword      = {Calibration,Modelica,grade change,cheical industry,polymerisation},
  language     = {eng},
  pages        = {673--677},
  publisher    = {Elsevier},
  title        = {Calibration of a polyethylene plant for grade change optimisations},
  volume       = {29},
  year         = {2011},
}