Controllability of three types of dividing wall columns
Journal
Computer Aided Chemical Engineering
Journal Volume
31
Pages
1567-1571
Date Issued
2012
Author(s)
Chao C.-C.
Abstract
We investigated the pairing of controlled and manipulatd variables and the overall controllability of three types of dividing wall columns (with the dividing wall in the upper, lower and middle section of the column; DWCL, DWCU and DWCM, respectively) using steady-state and dynamic controllability measures. Dividing wall columns were designed for the separation of a mixture of three species with constant relative volatilities, for different values of the relative volatilities and feed compositions. The steady-state processes were simulated in Aspen Plus and the relative gain arrays, non-square relative gain array and condition number were determined for each case using the steady-state model. Finally, the dynamic responses of the processes were simulated in Aspen dynamics and an integral error criteria was used to compare the performance of different control structures. The results indicate that generally DWCL is favorable if the intermediate-boiling species is most plentiful in the feed, and DWCU is preferable in other cases. ? 2012 Elsevier B.V.
Subjects
Divided Wall Column
Process Control
Type
book part