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Authors
Adams, Gregory John; Burke, Brendan; Goodwin, Graham C.; Gravdahl, Jan Tommy; Peirce, Rob; Rojas, Alejandro J.

Digital Object Identifier (DOI)
10.3182/20080706-5-KR-1001.02356

Page Numbers:
13919-13924

Index Terms
Industrial applications of process control; Process modeling and identification; Nonlinear process control

Abstract
Evaporators are core units in many industrial processes including sugar mills. The dynamics of these systems are complex and hence the systems have been frequently used to demonstrate unusual systems and control behaviour. In this paper we explore a particular control architecture commonly employed in industry. We show that the architecture can lead to poor performance due to steam and concentration disturbances. An alternative architecture is then proposed which overcomes the difficulties.

References

REFERENCES
S.L. Elhaq, F. Giri, and H. Unbehauen. The development
of controllers for a multiple-effect evaporator in sugar
industry. In proc. of the 1997 European Control Conference,
Brussels, Belgium, July 1997.
S.L. Elhaq, F. Giri, and H. Unbehauen. Modelling, identification
and control of sugar evaporation - theoretical
design and experimental evaluation. Control Engineering
Practice, 7:931–942, 1999.
E. Hugot. Handbook of Cane Sugar Engineering. Elsevier,
third edition, 1986.
D. Kaya and H.I. Sarac. Mathematical modeling of
multiple-effect evaporators and energy economy. Energy
32 (2007) 15361542, 32:1536–1542, 2007.
A. Montano and G. Silva. Design of a nonlinear control
for a double effect evaporator. In Proceedings of the
First European Control Conference, pages 2256–2261,
Grenoble, France, July 1991.
R.B. Newell and D.G. Fisher. Model development, reduction
and experimental evaluation for evaporator. Ind.
Eng. Chem. Process Des. Develop., 11(2):213–221, 1972.
R.B. Newell and P.L. Lee. Applied process control: a case
study. Prentice Hall, Sydney, 1989.
K.M. Nielsen, T.S. Pedersen, and J.F.D. Nielsen. Simulation
and control of a multiple effect evaporator. In
Proc. of UKACC International conference on control,
September 1996.
A.V. Pitteea, R.T.F. Ah King, and H.C.S. Rughooputh.
Intelligent controller for multiple-effect evaporator in
the sugar industry. In Proc. of the 2004 IEEE International
conference on industrial technology, pages 1177–
1182, 2004.
G. Silva-Navarro and J. Alvarez-Gallegos. Sign and stability
of equilibria in quasi-monotone positive nonlinear
systems. IEEE Transactions on automatic control, 42
(3):403–407, March 1997.
H. Sira-Ram´?rez and O. Llanes-Santiago. Dynamical
discontinuous feedback strategies in the regulation of
nonlinear chemical processes. IEEE Transactions on
control systems technology, 2(1):11–21, March 1994.
H. Sira-Ram´?rez and G. Silva-Navarro. On the regulation
of a double effect evaporator: a trajectory planning and
passivity approach. In Proc. of the 14th IFAC World
congress, pages 201–206, Beijing, P.R. China, 1999.