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

doi:10.1016/j.cjche.2022.12.009

中国化学工程学报 ›› 2023, Vol. 59 ›› Issue (7): 135-145.DOI: 10.1016/j.cjche.2022.12.009

• Full Length Article • 上一篇下一篇

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

Borui Liu¹, Tao Zhang¹, Yi Zheng¹, Kailong Li¹, Hui Pan², Hao Ling¹

1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China

收稿日期:2022-07-13 修回日期:2022-12-18 出版日期:2023-07-28 发布日期:2023-10-14
通讯作者: Hui Pan,E-mail:fiona_panhui@shiep.edu.cn;Hao Ling,E-mail:linghao@ecust.edu.cn
基金资助:
This work is supported by National Natural Science Foundation of China (21908056), Shanghai Sailing Program (19YF1410800) and Science and Technology Commission of Shanghai Municipality (19DZ2271100).

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

Borui Liu¹, Tao Zhang¹, Yi Zheng¹, Kailong Li¹, Hui Pan², Hao Ling¹

1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China

Received:2022-07-13 Revised:2022-12-18 Online:2023-07-28 Published:2023-10-14
Contact: Hui Pan,E-mail:fiona_panhui@shiep.edu.cn;Hao Ling,E-mail:linghao@ecust.edu.cn
Supported by:
This work is supported by National Natural Science Foundation of China (21908056), Shanghai Sailing Program (19YF1410800) and Science and Technology Commission of Shanghai Municipality (19DZ2271100).

摘要/Abstract

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.

关键词: Separation, Divided-wall column, Liquid-only transfer stream, Optimal design, Dynamic modeling

Abstract: 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.

Key words: Separation, Divided-wall column, Liquid-only transfer stream, Optimal design, Dynamic modeling

Borui Liu, Tao Zhang, Yi Zheng, Kailong Li, Hui Pan, Hao Ling. A dynamic control structure of liquid-only transfer stream distillation column[J]. 中国化学工程学报, 2023, 59(7): 135-145.

Borui Liu, Tao Zhang, Yi Zheng, Kailong Li, Hui Pan, Hao Ling. A dynamic control structure of liquid-only transfer stream distillation column[J]. Chinese Journal of Chemical Engineering, 2023, 59(7): 135-145.

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

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

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