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Quality control of binary distillation columns via nonlinear aggregated models

1991; Elsevier BV; Volume: 27; Issue: 3 Linguagem: Inglês

10.1016/0005-1098(91)90104-a

1873-2836

Jean Lévine, Pierre Rouchon,

Crystallization and Solubility Studies

Using singular perturbation techniques on a physical model of distillation column, an aggregated model is proposed for control purposes. Nonlinear perturbation rejection techniques via static feedback are then applied to this model to reject the feed composition disturbances: around every slowly varying reference trajectory, the existence of such a control law and the stability of the overall closed-loop system are proven. Moreover, the obtained control law can be synthesized with measurements commonly available on distillation columns: the product compositions and two inner temperatures. An industrial implementation on a refinery depropanizer of 42 trays is presented. Simulation comparisons with linear and nonlinear geometric-control laws, both using the physical model of high dimension, show the robustness and flexibility improvements provided by our method.