Model reduction and control in reactor-heat exchanger networks

Michael Baldea, Prodromos Daoutidis

Research output: Contribution to journalConference articlepeer-review


This paper focuses on energetic aspects of the dynamics and control of process networks with high material recycle. Two prototype systems are analyzed, for which the large material recycle acts as an energy carrier, leading to a high energy throughput for the entire network. Using singular perturbation arguments, we show that the variables in the energy balance of these networks evolve in the fast time scale, while the terms in the material balance equations can exhibit both fast and slow transients. We present a procedure for deriving reduced-order, non-stiff models for the fast and slow dynamics, the latter typically of low order, and a framework for rational control system design, that accounts for the time scale separation exhibited by the system dynamics. The theoretical results are illustrated in a reactor-external heat exchanger network example.

Original languageEnglish (US)
Pages (from-to)167-177
Number of pages11
JournalIFAC Proceedings Volumes (IFAC-PapersOnline)
Issue number9
StatePublished - 2004
Event7th IFAC Symposium on Dynamics and Control of Process Systems, DYCOPS 2004 - Cambridge, United States
Duration: Jul 5 2004Jul 7 2004

Bibliographical note

Funding Information:
1 Partial support for this work by ACS-PRF, grant 38114-AC9 and NSF-CTS, grant 0234440 is gratefully acknowledged.

Publisher Copyright:
Copyright © IFAC Dynamics and Control of Process Systems, Cambridge, Massachusetts, USA, 2004


  • Energy recycle
  • Model reduction
  • Nonlinear control
  • Singular perturbations


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