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Proportional-Integral Control and Model Predictive Control of Extractive Dividing-Wall Column Based on Temperature Differences
Industrial & Engineering Chemistry Research ( IF 4.2 ) Pub Date : 2018-07-30 , DOI: 10.1021/acs.iecr.8b02729
Zemin Feng 1, 2 , Weifeng Shen 1 , G. P. Rangaiah 2 , Lichun Dong 1, 3
Affiliation  

Extractive dividing-wall column (EDWC) was proved to be a promising energy-saving technique for the separation of multiple azeotropes or close-boiling mixtures; however, its controllability is very challenging due to its intensified structure with smaller physical space and strong interactions. Most studies on the EDWC control focused on evaluating the performance of temperature or composition control using proportional-integral (PI) control; nevertheless, significant steady-state offsets and overshoots are present in the control of two product purities of EDWC under different disturbances. In this paper, the performance of single temperature control (TC), temperature difference control (TDC) and double temperature control (DTDC) schemes for PI control of EDWC was first examined for the separation of toluene and 2-methoxyethanol using dimethyl sulfoxide as the entrainer. The results show that the steady-state offsets in product purities of TDC scheme are much smaller than those of TC and DTDC schemes. Subsequently, the offset-free model predictive control (MPC) based on temperature differences was proposed to improve the operation of EDWC. The results indicate that this MPC scheme can achieve much better control performance than PI control in terms of maximum transient deviation, amplitude of oscillations and setting time.

中文翻译:

基于温差的抽气式分隔壁塔的比例积分控制和模型预测控制

事实证明,萃取式分隔壁塔(EDWC)是一种用于分离多种共沸物或密闭沸腾混合物的节能技术。但是,由于其结构紧凑,物理空间较小和交互作用强,其可控性非常具有挑战性。关于EDWC控制的大多数研究都集中在评估使用比例积分(PI)控制的温度或成分控制的性能上。但是,在不同干扰下,EDWC的两种产品纯度的控制中仍存在明显的稳态偏移和过冲。在本文中,单温度控制(TC)的性能 首先研究了使用温差控制(TDC)和双温度控制(DTDC)方案进行EDWC的PI控制,以二甲基亚砜为夹带剂分离甲苯和2-甲氧基乙醇。结果表明,TDC方案的产品纯度稳态偏移量比TC和DTDC方案的稳态偏移量小得多。随后,提出了基于温差的无偏移模型预测控制(MPC),以改善EDWC的运行。结果表明,就最大瞬态偏差,振荡幅度和设置时间而言,该MPC方案可实现比PI控制更好的控制性能。提出了基于温差的无偏移模型预测控制(MPC),以改善EDWC的运行。结果表明,就最大瞬态偏差,振荡幅度和设置时间而言,该MPC方案可实现比PI控制更好的控制性能。提出了基于温差的无偏移模型预测控制(MPC),以改善EDWC的运行。结果表明,就最大瞬态偏差,振荡幅度和设置时间而言,该MPC方案可实现比PI控制更好的控制性能。
更新日期:2018-07-30
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