Model-Based Optimization of Economical Grade Changes for the Borealis Borstar Polyethylene Plant
Larsson, Per-Ola LU ; Åkesson, Johan LU ; Carlsson, Niclas and Andersson, Niklas LU
(2012)
In Computers & Chemical Engineering
46.
p.153-166
- Abstract
- Economical grade changes are considered for a Borealis Borstar polyethylene plant model, incorporating two slurry-phase reactors, one gas-phase reactor and a recycle area with three distillation columns. The model is constructed in the Modelica language and the JModelica.org platform is used for opti- mization. The cost function expresses the economical profit during a grade change and is formulated using on-grade intervals for seven polymer quality variables such as melt index, density and reactor split factors. Additionally, incentives to produce polymer with quality variables on grade target values, not only inside grade intervals, are added. Twelve inflows and three purge flows are used at optimization. Two grade changes are thoroughly... (More)
- Economical grade changes are considered for a Borealis Borstar polyethylene plant model, incorporating two slurry-phase reactors, one gas-phase reactor and a recycle area with three distillation columns. The model is constructed in the Modelica language and the JModelica.org platform is used for opti- mization. The cost function expresses the economical profit during a grade change and is formulated using on-grade intervals for seven polymer quality variables such as melt index, density and reactor split factors. Additionally, incentives to produce polymer with quality variables on grade target values, not only inside grade intervals, are added. Twelve inflows and three purge flows are used at optimization. Two grade changes are thoroughly reviewed, showing the effect of using a cost function that regards plant economy. Re- sulting trajectories can be divided into three phases with distinguishing fea- tures, and the synchronization of inflows and usage of recycle area off-gas flows are important in the grade changes. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2972262
- author
- Larsson, Per-Ola
LU
; Åkesson, Johan
LU
; Carlsson, Niclas
and Andersson, Niklas
LU
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- optimization, grade change, polymer, economy
- in
- Computers & Chemical Engineering
- volume
- 46
- pages
- 153 - 166
- publisher
- Elsevier
- external identifiers
-
- wos:000308714800014
- scopus:84864942620
- ISSN
- 1873-4375
- DOI
- 10.1016/j.compchemeng.2012.06.024
- project
- PICLU
- language
- English
- LU publication?
- yes
- additional info
- key=lar+12cace month=November project=LCCC-modeling
- id
- f0b2d9bd-a33d-4b7d-8be4-194c7e6fea7a (old id 2972262)
- date added to LUP
- 2016-04-01 15:02:22
- date last changed
- 2024-01-10 12:00:28
@article{f0b2d9bd-a33d-4b7d-8be4-194c7e6fea7a,
abstract = {{Economical grade changes are considered for a Borealis Borstar polyethylene plant model, incorporating two slurry-phase reactors, one gas-phase reactor and a recycle area with three distillation columns. The model is constructed in the Modelica language and the JModelica.org platform is used for opti- mization. The cost function expresses the economical profit during a grade change and is formulated using on-grade intervals for seven polymer quality variables such as melt index, density and reactor split factors. Additionally, incentives to produce polymer with quality variables on grade target values, not only inside grade intervals, are added. Twelve inflows and three purge flows are used at optimization. Two grade changes are thoroughly reviewed, showing the effect of using a cost function that regards plant economy. Re- sulting trajectories can be divided into three phases with distinguishing fea- tures, and the synchronization of inflows and usage of recycle area off-gas flows are important in the grade changes.}},
author = {{Larsson, Per-Ola and Åkesson, Johan and Carlsson, Niclas and Andersson, Niklas}},
issn = {{1873-4375}},
keywords = {{optimization; grade change; polymer; economy}},
language = {{eng}},
pages = {{153--166}},
publisher = {{Elsevier}},
series = {{Computers & Chemical Engineering}},
title = {{Model-Based Optimization of Economical Grade Changes for the Borealis Borstar Polyethylene Plant}},
url = {{http://dx.doi.org/10.1016/j.compchemeng.2012.06.024}},
doi = {{10.1016/j.compchemeng.2012.06.024}},
volume = {{46}},
year = {{2012}},
}