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Composition control and temperature inferential control of dividing wall column based on model predictive control and PI strategies

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Chinese Journal of Chemical Engineering 2018年第5期26卷 1087-1101页

作者： Jianxin Wang Na Yu Mengqi Chen Lin Cong Lanyi Sun State Key Laboratory of Heavy Oil Processing College of Chemical Engineering China University of Petroleum (East China) College of Information and Control Engineering China University of Petroleum (East China)

The dividing wall column （DWC） is considered as a major breakthrough in distillation technology and has good prospect of industrialization. Model predictive control （MPC） is an advanced control strategy that has acquired extensive applications in various industries. In this study, MPC is applied to the process for separating ethanol, n-propanol, and n-butanol ternary mixture in a fully thermally coupled DWC. Both composition control and tem- perature inferent/al control are considered. The multiobjective genetic algor/thm function ＂gamult/obj＂ in Matlab is used for the weight tuning of MPC. Comparisons are made between the control performances of MPC and PI strategies. Simulation results show that although both MPC and PI schemes can stabilize the DWC in case of feed disturbances, MPC generally behaves better than the PI strategy for both composition control and tempera- ture inferential control, resulting in a more stable and superior performance with lower values of integral of squared error （ISE）.

关键词： dividing wall column Composition control Temperature inferential control PI strategy Model predictive control Genetic algorithm

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Numerical Investigation on Effect of Vapor Split Ratio to Performance and Operability for dividing wall column

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Chinese Journal of Chemical Engineering 2013年第1期21卷 72-78页

作者： Laleh Torab Maralani 袁希钢罗祎青龚超余国琮 State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University

Operability problem of dividing wall column (DWC) raised by vapor split was investigated by numerically analyzing four cases defined by different compositions of a three-component mixture. DWCs were firstly designed for each case by optimizing the vapor split to the two sides of the dividing wall, and then their feasibilities and total annual costs in operation were evaluated against different vapor split ratios. The analysis on the operability of the DWC for four cases was made based on two scenarios: (1) vapor split is shifted by the vapor resistance difference between the column sections in the two sides of the dividing wall and (2) the feed composition is changed. It was demonstrated that the positioning of the dividing wall and the decision on the vapor split may affect significantly the operability of a DWC.

关键词： dividing wall column vapor split ratio operability

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Energy conserving effects of dividing wall column

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Chinese Journal of Chemical Engineering 2015年第6期23卷 934-940页

作者：方静赵寒梅祁建超李春利齐俊杰郭佳佳 School of Chemical Engineering Hebei University of Technology

The energy-conserving performance of dividing wall column(DWC) is discussed in this paper. The heat transfer through the dividing wall is considered and the results are compared with that of common heat insulation dividing wall column(HIDWC). Based on the thermodynamic analysis of heat transfer dividing wall column(HTDWC) and HIDWC, both computer simulation and experiments are employed to analyze the energyconserving situation. Mixtures of n-hexane, n-heptane and n-octane are chosen as the example for *** results show that the energy consumption of HTDWC is 50.3% less than that of conventional distillation column, while it is 46.4% less than that of HIDWC. It indicates that DWC is efficient on separating threecomponent mixtures and HTDWC can save more energy than HIDWC. Thus it is necessary to consider the heat transfer while applying DWC to industry.

关键词： dividing wall column Energy-saving Heat transfer Back-mixing Thermodynamic efficiency

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