文献类型：期刊文献

英文题名：Remixing Control for Divided-Wall Columns

作者：Ling, Hao[1];Cai, Zhi[2];Wu, Hao[1];Wang, Jun[2];Shen, Benxian[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Sinopec Jiujiang Co, Jiujiang 332004, Jiangxi, Peoples R China

年份：2011

卷号：50

期号：22

起止页码：12694

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20114614513743);WOS:【SCI-EXPANDED(收录号:WOS:000296674500043)】；

基金：We thank Professor William L. Luyben for the very helpful discussions. The financial support given by Sinopec Jiujiang Company and Ministry of Education of People's Republic of China is also gratefully acknowledged.

语种：英文

外文关键词：Energy utilization - Mixtures - Energy conservation - Closed loop control systems

摘要：The divided-wall column is an energy saving promising technology for the separation of ternary mixtures, but control. is difficult because of its complexity structure and interactions Of control loops. Although a few control methods have been reported, the general control method for all ternary mixtures is still Pending because of the difference of relative volatilities. In this work we explore a new control structure by control the remixing of the intermediate. at the top trays in the prefractionator section for the separation of benzene, toluene, and o-xylene. It is found that avoiding the remixing of toluene helps the column work very close to the optimal conditions. The remixing of toluene is studied at steady state first: Then; a remixing control structure with one remixing control loop and three composition control loops is presented. Minimized energy consumption is achieved by avoiding the remixing of toluene at the top of the prefractionator. Disturbances in feed flow rate and feed compositions are used to demonstrate the effectiveness of the proposed control structure. Remixing profile analysis of intermediate compounds gives an easy and new way to design and control the divided wall column at energy saving conditions.