Control of High Purity Distillation Columns

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Roodpeyma, Maedeh | 2008

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39025 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Shahrokhi, Mohammad
Abstract:
Selection of the most appropriate control configuration for two point control strategy in a distillation column is a challenging problem. In the present work, three control configurations namely , and , have been employed to control a high purity distillation column separating the binary mixture of Benzene-Toluene. A simple linear model for the process has been derived via a system identification technique. The uncertainty and performance weights have been defined and have been utilized to design a robust controller based on the μ-synthesis approach. The genetic algorithm is employed and the peak value of μ is minimized in order to obtain appropriate PI controller parameters for each configuration. Simulation results indicate that robust stability and robust performances are satisfied for uncertainties considered in the system inputs. The results reveal that the best performance belongs to the ratio configuration
Keywords:
Control Structure ; Genetic Algorithm ; Robust Control ; High Purity ; Distillation Column

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