Simultaneous steady state and dynamic design of process systems using structural indicators

Walsh, A. M. and Cameron, I. T. (1999) Simultaneous steady state and dynamic design of process systems using structural indicators. Computers and Chemical Engineering, 23 Supplement: S55-S58. doi:10.1016/S0098-1354(99)80015-5

Author Walsh, A. M.
Cameron, I. T.
Title Simultaneous steady state and dynamic design of process systems using structural indicators
Journal name Computers and Chemical Engineering   Check publisher's open access policy
ISSN 0098-1354
Publication date 1999-01-01
Sub-type Article (original research)
DOI 10.1016/S0098-1354(99)80015-5
Volume 23
Issue Supplement
Start page S55
End page S58
Total pages 4
Place of publication Oxford
Publisher Elsevier Ltd.
Language eng
Subject C1
250101 Chemical Thermodynamics and Energetics
770405 Physical and chemical conditions
Abstract The simultaneous design of the steady-state and dynamic performance of a process has the ability to satisfy much more demanding dynamic performance criteria than the design of dynamics only by the connection of a control system. A method for designing process dynamics based on the use of a linearised systems' eigenvalues has been developed. The eigenvalues are associated with system states using the unit perturbation spectral resolution (UPSR), characterising the dynamics of each state. The design method uses a homotopy approach to determine a final design which satisfies both steady-state and dynamic performance criteria. A highly interacting single stage forced circulation evaporator system, including control loops, was designed by this method with the goal of reducing the time taken for the liquid composition to reach steady-state. Initially the system was successfully redesigned to speed up the eigenvalue associated with the liquid composition state, but this did not result in an improved startup performance. Further analysis showed that the integral action of the composition controller was the source of the limiting eigenvalue. Design changes made to speed up this eigenvalue did result in an improved startup performance. The proposed approach provides a structured way to address the design-control interface, giving significant insight into the dynamic behaviour of the system such that a systematic design or redesign of an existing system can be undertaken with confidence.
Keyword Computer Science, Interdisciplinary Applications
Engineering, Chemical
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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Created: Mon, 13 Aug 2007, 22:14:56 EST