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Analysis of an Oscillating Two-Stage Evaporator System through Modelling and Simulation: an Industrial Case Study

Yamanee-Nolin, Mikael LU ; Andersson, Niklas LU ; Nilsson, Bernt LU ; Max-Hansen, Mark and Pajalic, Oleg (2018) In Chemical Engineering Transactions 69. p.481-486
Abstract
With increasing demands on the industry for resource efficiency, processes are often built or retrofitted with
recycle streams in order to decrease energy and raw material demands. However, this also increases the
complexity of the process as a whole and may bring unexpected effects. In this contribution, such a case,
consisting of a two-stage evaporator system, fed with the product stream of an upstream batch system and a
continuous recycling stream from downstream separation processes, was analyzed. This evaporator system
was subject to potentially performance-limiting oscillating disturbances. The purpose of this study was to,
through modelling and simulation, expand the knowledge of the system by analyzing the... (More)
With increasing demands on the industry for resource efficiency, processes are often built or retrofitted with
recycle streams in order to decrease energy and raw material demands. However, this also increases the
complexity of the process as a whole and may bring unexpected effects. In this contribution, such a case,
consisting of a two-stage evaporator system, fed with the product stream of an upstream batch system and a
continuous recycling stream from downstream separation processes, was analyzed. This evaporator system
was subject to potentially performance-limiting oscillating disturbances. The purpose of this study was to,
through modelling and simulation, expand the knowledge of the system by analyzing the system dynamics,
and to discover any co-oscillations and their extent in the process, as well as their effect on process
parameters such as product purity and the energy usage in terms of steam consumption. The investigation
was performed by modelling using Aspen Plus Dynamics. Simulation, data-extraction, and analysis was
performed via a COM enabled Python interface. The results of the study highlight the full-system propagation
of oscillations along with co-oscillation of selected key parameters, and support the conclusion that there is
potential for cost-reductions by decreasing steam consumption by 1.1 %, without any investments. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Chemical Engineering Transactions
volume
69
pages
6 pages
publisher
AIDIC ServizuI SRL
external identifiers
  • scopus:85054629400
ISSN
1974-9791
DOI
10.3303/CET1869081
language
English
LU publication?
yes
id
2cf3a705-0367-4a2d-8cb6-063673152a98
date added to LUP
2018-10-24 13:47:19
date last changed
2018-11-08 10:59:52
@article{2cf3a705-0367-4a2d-8cb6-063673152a98,
  abstract     = {With increasing demands on the industry for resource efficiency, processes are often built or retrofitted with<br/>recycle streams in order to decrease energy and raw material demands. However, this also increases the<br/>complexity of the process as a whole and may bring unexpected effects. In this contribution, such a case,<br/>consisting of a two-stage evaporator system, fed with the product stream of an upstream batch system and a<br/>continuous recycling stream from downstream separation processes, was analyzed. This evaporator system<br/>was subject to potentially performance-limiting oscillating disturbances. The purpose of this study was to,<br/>through modelling and simulation, expand the knowledge of the system by analyzing the system dynamics,<br/>and to discover any co-oscillations and their extent in the process, as well as their effect on process<br/>parameters such as product purity and the energy usage in terms of steam consumption. The investigation<br/>was performed by modelling using Aspen Plus Dynamics. Simulation, data-extraction, and analysis was<br/>performed via a COM enabled Python interface. The results of the study highlight the full-system propagation<br/>of oscillations along with co-oscillation of selected key parameters, and support the conclusion that there is<br/>potential for cost-reductions by decreasing steam consumption by 1.1 %, without any investments.},
  author       = {Yamanee-Nolin, Mikael and Andersson, Niklas and Nilsson, Bernt and Max-Hansen, Mark and Pajalic, Oleg},
  issn         = {1974-9791},
  language     = {eng},
  pages        = {481--486},
  publisher    = {AIDIC ServizuI SRL},
  series       = {Chemical Engineering Transactions},
  title        = {Analysis of an Oscillating Two-Stage Evaporator System through Modelling and Simulation: an Industrial Case Study},
  url          = {http://dx.doi.org/10.3303/CET1869081},
  volume       = {69},
  year         = {2018},
}