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Chemical Engineering Science
43 (1),
pages 33-48, 1988
Abstract
A realistic study of the LV-control of a high-purity distillation column is presented. Linear controllers designed based on a linearized model of the plant are found to yield acceptable performance also when there is model--plant mismatch. The mismatch can be caused by uncertainty on the manipulated inputs, nonlinearity and variations in reboiler and condenser holdup. The presence of input uncertainty makes the use of a steady-state decoupler unacceptable. The effect of nonlinearity is strongly reduced by using the logarithm of the compositions. A simple diagonal PI-controller is not sensitive to model--plant mismatch, but yields a response with a sluggish return to steady-state.