Dynamics and Control

F. Greg Shinskey/ B.S.Ch.E./ Consultant (retiredfrom Eoxboro Co.), North Sandwich, NH. (Fundamentals of Process Dynamics and Control, Unit Operations Control)... 

The PI controller is by far the most commonly used controller in the process industries. The summation of the deviation with its integral in the above equation can be interpreted in terms of frequency response of the controller (Seborg, Edgar, and Melhchamp, Process Dynamics and Control, Wiley, New York, 1989). The PI controller produces a phase lag between zero and 90 degrees ... 

McGraw-Hill, New York, 1988. Seborg, D. E., T. F. Edgar, and D. A. Mel-lichamp, Vrocess Dynamics and Control, Wiley, New York, 1989. McAvoy T. J., Interaction Analysis, ISA, Research Triangle Park, North Carohna, 1983. 

S. Candel. Combustion dynamics and control Progress and challenges. Proc. Combust. Inst., 29 1-28,2002. 

Rademaker, O., Rijnsdarp, J. E. and Maarleveld, A. (1975) Dynamics and Control of Continuous Distillation Units, Elsevier Scientific. 

Wankat, P. C. (1990) Rate Controlled Separations, Elsevier Applied Science. Weber, T. W. (1978) An Introduction to Process Dynamics and Control, Wiley-Interscience. 

Skogestad, S. Dynamic and Control of Distillation Columns—A Critical Survey. Modeling Identification Control 18 177-217 (1997). 

He has published over 200 papers in the fields of process control, optimization, and mathematical modeling of processes such as separations, combustion, and microelectronics processing. He is coauthor of Process Dynamics and Control, published by Wiley in 1989. Dr. Edgar was chairman of the CAST Division of AIChE in 1986, president of the CACHE Corporation from 1981 to 1984, and president of AIChE in 1997. 

Douglas, J.M. (1972) Process Dynamics and Control, Vols. 1 and 2, Prentice Hall. 

Edwards, V. H., Ko, R.C. and Balogh, S.A. (1972) Dynamics and Control of Continuous Microbial Propagators Subject to Substrate Inhibition, Biotechnol. Bioeng. 14, 939-974. 

This chapter is an introduction to process dynamics and control for those students who have had little or no contact or experience with real chemical engineering processes. The objective is to illustrate where process control fits into the picture and to indicate its relative importance in the operation, design, and development of a chemical engineering plant. 

Probably the best way to illustrate what we mean by process dynamics and control is to take a few real examples. The first example describes a simple process where dynamic response, the time-dependent behavior, is important. The second example illustrates the use of a single feedback controller. The third example discusses a simple but reasonably typical chemical engineering plant and its conventional control system involving several controllers. 

In the study of process dynamics and control we will use several languages. 

We will find it very useful in practically all the linear dynamics and control studies in the rest of the book to look at the changes of variables away from steadystate values instead of the absolute variables themselves. Why this is useful will become apparent in the discussion below. 

TIME-DOMMN DYNAMICS AND CONTROL The total solution is... 

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