In dividing wall column, I am trying to find the tuning parameters of PI controller for the pulse change in the set point of the three compositions. However, My PI controller can track the set point of the bottom and distillate compositions only, whereas, the middle boiling component in the intermediate stream does not moves toward the new set point. To note here, reflux rate is the manipulated variable for the distillate, steam flowrate as manipulated variable for the bottom, and the side stream flowrate for the intermediate stream.
Kindly suggest me with your experience.
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