Analysis of Multi-Loop Control Structures of Dividing-Wall Distillation Columns Using a Fundamental Model

Tututi-Ávila, Salvador; Jiménez‐Gutiérrez, Arturo; Hahn, Juergen

doi:10.3390/pr2010180

Cited by 13 publications

(9 citation statements)

References 45 publications

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“…One‐point control requires more energy than two‐point control, likewise, a further increase in the number of control variables can allow for further reduction in energy consumption. Successful applications of DWCs have been reported by various industries 4–15. The minimization of energy consumption using a systematic sensitivity analysis and optimization of DWCs has yet to be attempted.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design and Economic Evaluation of Dividing‐Wall Columns

et al. 2016

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In an effort to reduce costs, a systematic optimization approach is proposed to address the energy consumption of dividing-wall columns (DWCs). This iterative optimization procedure begins by minimizing the overall heat duty using an innovative objective function within a constrained design space. A sensitivity analysis is then carried out on the manipulated variables to obtain their optimal ranges. Optimal operating parameters are obtained through the evaluation of the total annualized cost (TAC). For the separation process of benzene/toluene/o-xylene, the optimal DWC flow sheet exhibits a significant decrease in TAC when compared to conventional flow sheet optimum designs. The applied optimization method and sensitivity analysis have proven to produce results at the global optimum. This method is both practical and easily applied to other systems, even to systems with more than three components.

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Section: Introductionmentioning

confidence: 99%

Optimal Design and Economic Evaluation of Dividing‐Wall Columns

et al. 2016

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“…Composition control structure takes composition, re ux drum level, and sump level of column as controlled variables. It can deal with feed disturbances and return to steady state in 2∼10 hr [12,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], while sometimes it takes a long time to get steady [24,33,35].…”

Section: Introductionmentioning

confidence: 99%

Separating Mixture Glycols in DWC with Flow Rate-Composition Cascade Control Structure

et al. 2022

Journal of Chemistry

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Dividing wall column (DWC) is an advanced technology which could decrease energy consumption. As the vertical wall inserted in DWC increases the degree of freedom of systems, the control becomes more difficult than the conventional columns. In this study, the mixture glycols (1, 2-propanediol+ 1, 3-butanediol+ 1, 4-butanediol) were taken as feed, an optimized DWC structure was proposed, and three control structures for DWC were tested by ± 10% feed disturbances. The temperature control structure (CS1) was hard to control the system while composition control structure (CS2) and flow rate-composition cascade control structure (CS3) had good performance on controlling the DWC. It showed that CS3 was superior to CS2, as CS3 could stabilize the DWC within 4 hours, and the maximum deviations of the three products, namely 1, 2-propanediol, 1, 3-butanediol and 1, 4-butanediol, were 0.07%, 1.44%, and 0.46% respectively, while CS2 could realize the stability within 7 hours, and the corresponding numbers were 0.35%, 2.78%, and 0.41%, respectively.

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“…Separations of multicomponent chemical mixtures have been carried out mainly in distillation columns trains. Ternary mixtures in particular have received special attention in the literature [2][3][4]. Conventional separation of ternary mixtures can be done by direct and indirect sequences (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Dividing-Wall Column Design: Analysis of Methodologies Tailored to Process Simulators

et al. 2021

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Dividing-wall columns (DWCs) are intensified processes that have attracted industrial and academic attention due to the reduction in operating and installation costs compared to traditional distillation systems. Several methodologies are available for the design of DWCs. Most of them consist of three parts: an analysis of operating variables; an analysis of the structural design (topology); and an optimization of the resulting preliminary design. This paper aims to study three widely used design methodologies reported in the literature for DWCs, i.e., Triantafyllou and Smith (T&S), minimum vapor (Vmin), and Sotudeh and Shahraki (S&S) methods, along with their implementation on process simulators. A proposed modification to the S&S methodology is also presented. A comparison of the methods is carried out and rated against designs with minimum total annual costs. The analysis considers the effect of different structural design variables to initialize the design procedure with each methodology. Five case studies involving mixtures with different ease of separation index were evaluated. The results show that the most efficient techniques were obtained with a modified Sotudeh and Shahraki’s methodology. It was also found that the T&S approach stands out from the other methods, as it provided excellent initial designs for the case studies tested in this work.

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Analysis of Multi-Loop Control Structures of Dividing-Wall Distillation Columns Using a Fundamental Model

Cited by 13 publications

References 45 publications

Optimal Design and Economic Evaluation of Dividing‐Wall Columns

Optimal Design and Economic Evaluation of Dividing‐Wall Columns

Separating Mixture Glycols in DWC with Flow Rate-Composition Cascade Control Structure

Dividing-Wall Column Design: Analysis of Methodologies Tailored to Process Simulators

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