Advanced

Modeling and Optimization of Grade Changes for Multistage Polyethylene Reactors

Larsson, Per-Ola LU ; Åkesson, Johan LU ; Haugwitz, Staffan and Andersson, Niklas LU (2011) 18th IFAC World Congress, 2011
Abstract
Grade changes in polyethylene reactors, i.e., changes of operating conditions, are performed on a regular basis to adapt to market demands. In this paper, a dynamic optimization procedure is presented built upon the Modelica language extended with Optimica constructs for formulation of optimization problems. A Modelica library for the Borstar R multistage polyethylene reactors at Borealis AB, consisting of two slurry and one gas phase reactor, has been constructed. Using JModelica.org, a framework to translate dynamic optimization problems to NLP problems, optimal grade transitions between grades currently used at Borealis AB, can be calculated. Optimal inflows and grade key variables are shown.
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
optimization, reactor control, polymerization, chemical industry
conference name
18th IFAC World Congress, 2011
project
PICLU
language
English
LU publication?
yes
id
3b8b88c6-316a-498c-9506-7a9789e33317 (old id 2202556)
date added to LUP
2011-11-04 11:26:18
date last changed
2016-09-26 16:22:50
@misc{3b8b88c6-316a-498c-9506-7a9789e33317,
  abstract     = {Grade changes in polyethylene reactors, i.e., changes of operating conditions, are performed on a regular basis to adapt to market demands. In this paper, a dynamic optimization procedure is presented built upon the Modelica language extended with Optimica constructs for formulation of optimization problems. A Modelica library for the Borstar R multistage polyethylene reactors at Borealis AB, consisting of two slurry and one gas phase reactor, has been constructed. Using JModelica.org, a framework to translate dynamic optimization problems to NLP problems, optimal grade transitions between grades currently used at Borealis AB, can be calculated. Optimal inflows and grade key variables are shown.},
  author       = {Larsson, Per-Ola and Åkesson, Johan and Haugwitz, Staffan and Andersson, Niklas},
  keyword      = {optimization,reactor control,polymerization,chemical industry},
  language     = {eng},
  title        = {Modeling and Optimization of Grade Changes for Multistage Polyethylene Reactors},
  year         = {2011},
}