Control of three types of dividing-wall columns
Date Issued
2014
Date
2014
Author(s)
Wang, Wei-Jyun
Abstract
Compared with conventional distillation columns, the dividing wall column is a promising design with high energy efficiency for separating multi-component mixtures. However, it is more difficult to design and control dividing wall columns because of their integrated designs. Complete study of control of the three types of the columns has never been discussed. Therefore, the main purpose of this work is to investigate the control of three types of dividing wall columns: columns with the dividing wall in the lower (DWCL) middle (DWCM) and upper (DWCU) portions of the column. The relative gain array (RGA) and condition number (CN) for these three column types are calculated for five different multicomponent systems. Based on these results, promising control structures are identified and tested in Aspen Dynamics. The results indicate that DWCU has the worst control performance of the three column types. DWCL outperforms DWCM in most cases, but the difference in controllability is not likely to justify the choice of a column configuration with higher costs. Finally, the temperature control of three types of dividing wall is studied. The results show that conventional temperature control cannot provide good performance in controlling dividing wall columns.
Subjects
內隔壁式蒸餾塔
控制
相對增益陣列
條件數
溫度控制
SDGs
Type
thesis
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