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 language||English (US)|
|Number of pages||11|
|Journal||IFAC Proceedings Volumes (IFAC-PapersOnline)|
|State||Published - 2004|
|Event||7th IFAC Symposium on Dynamics and Control of Process Systems, DYCOPS 2004 - Cambridge, United States|
Duration: Jul 5 2004 → Jul 7 2004
Bibliographical noteFunding Information:
1 Partial support for this work by ACS-PRF, grant 38114-AC9 and NSF-CTS, grant 0234440 is gratefully acknowledged.
- Energy recycle
- Model reduction
- Nonlinear control
- Singular perturbations