In this article, we address the derivation of reduced-order nonlinear models of high-purity distillation columns with large recycle and internal flowrates. We show through a singular perturbation analysis of the detailed tray-by-tray model that the presence of large internal flowrates leads to a time-scale separation in the column: (i) a fast dynamics corresponding to the individual stages, and (ii) a low-order slow dynamics of the column that governs the overall nonlinear input-output behavior. A description of the low-order slow dynamics of the column is derived and used for the synthesis of a well-conditioned nonlinear feedback controller.
|Original language||English (US)|
|Number of pages||5|
|Journal||Proceedings of the American Control Conference|
|State||Published - Dec 1 1999|
|Event||Proceedings of the 1999 American Control Conference (99ACC) - San Diego, CA, USA|
Duration: Jun 2 1999 → Jun 4 1999