Abstract
A method to design cascade control schemes in multicomponent distillation columns when top and bottom compositions are controlled, is presented. It assists in the choices of the loop where the cascade control has to be located and of the pilot tray of the column. The method is based on two parameters which have a clear physical meaning and are computed from a steady state analysis. It is illustrated by its applications to two refinery columns: a gasoline stabilizer and a GPL splitter. A comparison of results allows to point out advantages of a correct selection of cascade control, according to the proposed method.
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