Meny

Du är här

Model-Based Optimization of Economical Grade Changes for the Borealis Borstar Polyethylene Plant

Författare:
  • Per-Ola Larsson
  • Johan Åkesson (Assistant Professor)
  • Niclas Carlsson
  • Niklas Andersson
Publiceringsår: 2012
Språk: Engelska
Sidor: 153-166
Publikation/Tidskrift/Serie: Computers & Chemical Engineering
Volym: 46
Dokumenttyp: Artikel
Förlag: Elsevier
Ytterligare information: Key=lar+12cace month=November project=LCCC-modeling

Sammanfattning

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.

Disputation

Nyckelord

  • Technology and Engineering
  • optimization
  • grade change
  • polymer
  • economy

Övriga

Published
  • PICLU
Yes
  • LCCC
  • ISSN: 0098-1354

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen