Dynamics and Control of Divided Wall Columns
Date Issued
2011
Date
2011
Author(s)
Chao, Chuan-Chen
Abstract
The divided-wall column system is a promising energy saving alternative for separating multi-component mixtures compared with traditional distillation columns. However the design of DWCs is more difficult because there are more degrees of freedom. The control of the DWC have received much less attention. In this work, the controllability of a divided wall column for separating ideal system were investigated. The main objective of this work is to study the divided-wall column (DWC) controllability. A controllability analysis of the ideal system is done for the separation of different types of DWC, different ease separation index (ESI) and different feed condition. Different control structures are compared using linear analysis tools, relative gain array (RGA) and condition number (CN). Disturbances in feed fowrate and feed composition are used to demonstrate the effectiveness of the proposed control structure. Finally, a guideline for the selection of the divided-wall column is proposed. Based on control considerations for different feed conditions, it is found that: If there is more lightest component in the feed, DWCU is preferred. If there is more middle component in the feed, DWCL is preferred. If there is more heaviest component in the feed, DWCU is preferred.
Subjects
divided-wall column
control
relative gain array
Type
thesis
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