Abstract
In this work, the practical control capability assessment and the input-output pairing in the design of a control system for a class of Extractive Dividing Wall Distillation Columns is addressed through a parameter called Operability Index. The configured control system is equipped with PI conventional controllers, which all of them are simultaneously and systematically tuned through relationships coming from a pole-stable assignment approach. By considering the bioethanol dehydration as a case of study, known for its difficulty in achieving high purities, the control system’s performance is illustrated. The advantage of this control system design way lies on: (1) the Operability Index smartly provides the physical perception of the control effort that the input will likely perform to cause a change to the related output, (2) a systematic tuning framework that sidestep the typical procedure in distillation columns of tuning the controllers in a sequential way, and (3) the simplest calculations on the basis of the simplest parameters that can be identified in a complex process as a distillation column is: static gains, nominal value of the inputs and the one of the outputs, and settling times.
Published Version
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