Dynamic Behavior and Control of the Petlyukscheme via a Proportional-Integral controller with disturbance estimation (PII2)

J. G. Segovia-Hernández, S. Hernández, A. Jiménez and R. Femat

Abstract
Because of its significant energy savings, the Petlyuk column provides an interesting alternative to the use of conventional distillation systems. Its dynamic and operational characteristics, however, require a proper understanding to promote its practical use. In this work, a proportional-integral controller with dynamic estimation of unknown disturbances is implemented for the control of a Petlyuk column for the separation of ternary mixtures. The proposed controller comprises three feedback terms: proportional, integral and quadratic actions. The last term provides a dynamic estimation of uncertainties and improves the closed-loop performance. Comparison with the classical PI control law was carried out to analyze the performance of the proposed controller in face to unknown feed disturbances and set point changes. The results show that the closed-loop response of the Petlyuk column is significantly improved with the proposed controller.

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Keywords
distillation, Thermally coupled distillation, distillation control, disturbance rejection