Controllability analysis of thermodynamically equivalent thermally coupled arrangements for quaternary distillations

Alcántara-Ávila, J. Rafael; Cabrera-Ruiz, Julián; Segovia‐Hernández, Juan Gabriel; Hernández, Salvador; Rong, Ben-Guang

doi:10.1016/j.cherd.2007.10.006

Cited by 22 publications

(11 citation statements)

References 16 publications

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“…Control property analysis by using condition number and minimum singular values, and dynamic responses studies have shown that intensified separation systems, including DWC and Petlyuk systems, can outperform conventional column systems [14][15][16][17].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Effects of intensification on process features and control properties of lignocellulosic bioethanol separation and dehydration systems

Torres-Ortega

Ramírez‐Márquez

Sánchez‐Ramírez

et al. 2018

Chemical Engineering and Processing - Process Intensification

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Section: Accepted Manuscriptmentioning

confidence: 99%

Effects of intensification on process features and control properties of lignocellulosic bioethanol separation and dehydration systems

Torres-Ortega

Ramírez‐Márquez

Sánchez‐Ramírez

et al. 2018

Chemical Engineering and Processing - Process Intensification

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“…Two distillation sequences are thermodynamically equivalent if it is possible to go from one to another by moving column sections using the two streams of the thermal couple ( Figure 2 clarifies the concept of thermodynamically equivalent configurations). A comprehensive discussion on TECs and their implications in controllability can be found in papers by Agrawal [44], Agrawal & Fidkowski [45], Caballero & Grossmann [46], Rong et al [47,48] or AlcantaraAvila et al [49].…”

Section: Introductionmentioning

confidence: 99%

Optimal synthesis of thermally coupled distillation sequences using a novel MILP approach

Caballero

Grossmann

2014

Computers & Chemical Engineering

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This paper introduces a novel MILP approach for the design of distillation columns sequences of zeotropic mixtures explicitly including from conventional to fully thermally coupled sequences and divided wall columns with a single wall.The model is based on the use of two superstructure levels. In the upper level a superstructure that includes all the basic sequences of separation tasks and all the possibilities of heat exchange (condensers and reboilers). In the lower level an extended tree that explicitly includes all the alternatives for a given separation task (different thermal states and compositions of the feed to a given separation task). In that way, it is possible to a priori optimize all the possible separation tasks involved in the superstructure. A set of logical relationships relates the feasible sequences (upper level) with the optimized tasks in the extended tree resulting in a MILP to select the optimal sequence. Performance of the model in terms of robustness and computational time is illustrated with several examples.

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“…In Figure 6, it can be noted that both criteria have the similar order, then none can be neglected by the other. Also, it is possible to see how γ sm has the principal contribution when the condition number through the frequency domain changes Sequence Type: Set A, Quaternary Mixture thermally coupled (three mixtures, two feed compositions) CS TCDS-I TCDS-II A ́lcantara-A ́vila et al 29 TCDS-III TCDS-IV TCDS-V Petlyuk-type (two feed compositions) CSP-I CSP-II Rong et al 30 ISP-I ISP-II Sequence Type: Set B, Extractive Distillation Rami ́rez-Maŕquez et al 31 SSVR-GL CLR-EG CVR-GL CVR-EG rapidly or when the slope is quite steep. It has been mentioned in section 1.2 that this is an undesired behavior.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, Set A is divided into two subgroups: (1) partially coupled schemes and (2) Petlyuktype schemes. Alcańtara-A ́vila et al 29 studied the first subgroup, which consisted of quaternary mixtures where economic and control-lability criteria were calculated by optimizing the interconnecting liquid and vapor flows. The nomenclature of the schemes for the conventional sequence (CS) and thermally coupled distillation sequences (TCDS) remains as in their original work, as well as the design specifications of the founded optimal solutions.…”

Section: Cases Of Studymentioning

confidence: 99%

Outlook of the Dynamic Behavior of Closed-Loop Control through Open-Loop Analysis for Intensified Separation Processes

Cabrera-Ruiz

Ramírez‐Márquez

Hasebe

et al. 2018

Ind. Eng. Chem. Res.

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This work shows a comparative assessment of open-loop and closed-loop processes to select, among a set of alternatives, the best distillation scheme regarding its controllability. A new point of view to assess the controllability using the information from the singular value decomposition (SVD) technique is proposed. In the research, the techniques for comparing the open-loop analysis and closed-loop analysis were standardized. The open-loop controllability index was calculated from the minimum singular value and the condition number of the certain areas in the frequency domain and a simplified index for measuring the singularity in SVD results. The derived controllability index then was compared with the normalized value of the Integral Absolute Error (IAE) of a proportional–integral (PI) controller obtained under closed-loop operation. Several different frequency areas were investigated to calculate the SVD and were used to compare the open-loop and closed-loop behaviors. The selected best distillation scheme was the same despite the chosen approach. Through the simulation study, it is verified that the newly proposed controllability index based on the condition number derived from open-loop responses can be useful to predict the best performance under closed-loop operation. This prediction is suitable to use in an optimization algorithm, because of the structure of the proposed controllability index.

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Controllability analysis of thermodynamically equivalent thermally coupled arrangements for quaternary distillations

Cited by 22 publications

References 16 publications

Effects of intensification on process features and control properties of lignocellulosic bioethanol separation and dehydration systems

Effects of intensification on process features and control properties of lignocellulosic bioethanol separation and dehydration systems

Optimal synthesis of thermally coupled distillation sequences using a novel MILP approach

Outlook of the Dynamic Behavior of Closed-Loop Control through Open-Loop Analysis for Intensified Separation Processes

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