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

Mikael Yamanee-Nolin, Niklas Andersson, Bernt Nilsson, Mark Max-Hansen, Oleg Pajalic

Research output: Contribution to journalArticlepeer-review

3 Citations (SciVal)

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 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.
Original languageEnglish
Pages (from-to)481-486
Number of pages6
JournalChemical Engineering Transactions
Volume69
DOIs
Publication statusPublished - 2018

Subject classification (UKÄ)

  • Chemical Process Engineering

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