Robust control of high-purity distillation column. / Controle robusto de coluna de destilação de alta pureza.

AUTOR(ES)

Luís Roberto Schlemm Guedes

DATA DE PUBLICAÇÃO

2002

RESUMO

High-purity distillation columns are systems which are typically difficult to control. The main reason for this is a strongly nonlinear and interactive system associated with a very sluggish response. Model Predictive Control is widely used for control of distillation columns. However, for high-purity columns, the use of a single linear model in the controller usually leads to a poor performance of the control system. The reason for this is the poor system representation, since variation in the system gains and time constants are not taken into account in the computation of the control law. Model uncertainties can produce instability in the control system and consequent deterioration of the product quality. The goal of this work is to evaluate the performance of infinite horizon MPC with a single internal model and with multiple models. HYSYS(TM) is used as simulator for the benzene/toluene column, and MATLAB(TM) is used as a platform for supervisory control. It is observed that the controller with a single model is not capable of stabilizing the process for disturbance in the set point of the controlled variables. Opposite to that behavior the controller with multiple models has a good performance.

ASSUNTO(S)

predictive control process control robust control coluna de alta pureza controle preditivo controle de processo controle robusto high-purity distillation column

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