A dynamic control structure of liquid-only transfer stream distillation column

作     者：Borui Liu Tao Zhang Yi Zheng Kailong Li Hui Pan Hao Ling Borui Liu;Tao Zhang;Yi Zheng;Kailong Li;Hui Pan;Hao Ling

作者机构：State Key Laboratory of Chemical EngineeringSchool of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric PowerCollege of Environmental and Chemical EngineeringShanghai University of Electric PowerShanghai 200090China 

出 版 物：《中国化学工程学报:英文版》 (Chinese Journal of Chemical Engineering)

年 卷 期：2023年第59卷第7期

页      面：135-145页

核心收录：

学科分类：0711[理学-系统科学] 08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 0811[工学-控制科学与工程] 

基　　金：supported by National Natural Science Foundation of China(21908056) Shanghai Sailing Program(19YF1410800) Science and Technology Commission of Shanghai Municipality(19DZ2271100)。 

主　　题：Separation Divided-wall column Liquid-only transfer stream Optimal design Dynamic modeling 

摘      要：The intention of this fundamental work is to explore the manipulation of a mixture of benzene,toluene and o-xylene separated from liquid-only transfer divided-wall column(LTS-DWC).First,two control structures are clearly proposed,including seven component control loops(CS1)and seven temperature control loops(CS2).However,two control structures can handle ±10% feed disturbances rather than larger feed disturbances.Subsequently,an equivalent four-column model by introducing withdraw ratio is developed to discuss the effect of two liquid-only side-stream on the overall reboiler duty.It is indicated that the second liquid-only side-stream withdraw ratio strongly affects the overall energy consumption.Hence,six-component control loops within the fixed second liquid-only side-stream withdraw ratio(CS3)is proposed and the purity of products returns to set value even as facing ±20% feed disturbances.Finally,based on the above results,it is established a temperature control structure(CS4)for controlling fixed second liquid-only side-stream withdraw ratio,which can cope with ±15% disturbances.Inspired by these findings,an insight into the dynamic control of LTS-DWC promotes the industrial implementation of DWC through new liquid-only side-stream configurations.