Abstract
Feedback control systems for distillation columns are often based on controlling the temperatures of intermediate trays near the top and/or bottom of the column. This paper studies the application of feedforward control to this kind of column. In addition to adjusting manipulative variables like reflux and/or vapor boilup, the feedforward controller must also change feedback controller set points. Nonlinear steadystate and linear dynamic synthesis techniques are used to design the six feedforward controllers required. Effectiveness when applied to a nonlinear column is illustrated by digital simulation of a 20-tray binary column. Combined feedback/feedforward control performance is compared with feedback control alone.
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