This is to announce that a simple MATLAB/SIMULINK
dynamic distillation model is available on the web-site
http://www.kjemi.unit.no/~skoge
(see at the bottom of the page).
The model is for "column A" studied in several papers
by Skogestad and Morari, e.g. see S. Skogestad and M. Morari,
``Understanding the Dynamic Behavior of Distillation Columns'', Ind. &
Eng. Chem. Research, 27, 10, 1848-1862 (1988).
The model is the same as the one given in the book of Morari and
Zafiriou (1989) - see their Appendix - except that we have here also
included liquid flow dynamics, which is cruical if the model is used for
feedback control studies.
The following assumptions are used:
Binary mixture; constant pressure; constant relative volatility;
constant molar flows; no vapor holdup; linearized liquid dynamics, but
effect of vapor flow ("K2"-effect) is included;
equlibrium on all stages; total condenser.
The column has 40 theoretical stages and separates a binary mixture
with relative volatility of 1.5 into products of 99% purity.
It it relatively easy to change the model parameters to simulate
another column.
Both nonlinear and linear models are included; both for
the "full" 4x4 uncontrolled column, as well as for the LV, DV, and
L/D-V/B-configurations. The models can be used both using MATLAB
and SIMULINK.
All the files can be obtained via the web-page given above.
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New book
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The model is also used in the new book:
Multivariable feedback control (Wiley, 1996)
by S. Skogestad and I. Postlethwaite.
(see http://www.kjemi.unit.no/~skoge/book.html)
The book presents a rigorous, yet easily readable, introduction to the
analysis and design of multivariable feedback systems. It provides the
reader with insights which are invaluable when designing or tuning any
control system.
The book has been difficult to get in the US, but it should now be easily
available ($60).
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Sigurd Skogestad, Professor Fax: +47-7359-4080
Chemical Engineering Phone: +47-7359-4154
Norwegian University of Science and Technology Home: +47-7393-6855
N-7034 Trondheim e-mail: skoge@kjemi.unit.no
Norway http://www.kjemi.unit.no/~skoge
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