Energy Efficiency of an Indirect Thermally Coupled Distillation Sequence

Hernández, Salvador; Pereira-Pech, Salvador; Jiménez, Arturo; Rico-Ramı́rez, Vicente

doi:10.1002/cjce.5450810522

Cited by 54 publications

(31 citation statements)

References 7 publications

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“…Following a conceptual design approach Rong and coworkers presented different alternatives for sequences with four and five components including basic and non-basic configurations [25][26][27][28]. Kim and coworkers [29][30][31][32][33][34], Hernández and Jiménez [35], Hernández et al [36], Blancarte-Palacios et al [37], Calzon-…”

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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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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“…In this work, in order to overcome the complexity of the simultaneous solution of the tray arrangement and energy consumption within a formal optimization algorithm, we have decoupled the design problem in two stages: (1) tray configuration; (2) energy-efficient design (optimal energy consumption). In the first stage, our approach begins with the development of preliminary designs for the complex systems based on the designs of the conventional distillation sequences (as proposed by Hernández and Jiménez, 1996). For the conventional sequences, it is assumed that each column performs its respective split (i.e., the separation of the light and heavy key components) with molar recoveries of 98% respectively.…”

Section: Design and Optimization Strategiesmentioning

confidence: 99%

“…Among all possible complex schemes for multicomponent distillation process, the thermally coupled distillation sequences are very promising for both energy and capital cost savings. However, due to the complexity, research on these complex distillation configurations is only restricted to three -component mixtures, for only a few promising flowsheets that can be constructed for ternary mixtures (Tedder and Rudd, 1978;Hernández and Jiménez, 1996). In these studies, it has been reported that the thermally coupled configurations are capable of achieve energy savings of up to 30% in contrast to the conventional direct and indirect distillation sequences.…”

Section: Introductionmentioning

confidence: 99%

Controllability analysis of thermally coupled distillation sequences for five—Component mixtures

Rodriguez

Martínez

Segovia‐Hernández

et al. 2006

16th European Symposium on Computer Aided Process Engineering and 9th International Symposium on Process Systems Engineering

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The control properties of thermally coupled distillation sequences for the separation of five -component mixtures of hydrocarbons were compared to those of conventional distillation sequences. Seven thermally coupled arrangements were investigated. The preliminary steady -state designs of complex schemes were obtained by starting from conventional distillation sequences and then optimizing for minimum energy consumption. The control properties of the sequences considered were obtained by using the singular value decomposition technique at zero frequency and analyzing rigorous dynamic simulations. It was found that, in general, the coupled schemes present theoretical control properties similar or better than those of conventional distillation sequences. This result establishes that the energy savings predicted for thermally coupled distillation sequences can be achieved in practice.

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“…Jiménez (1996, 1999a) have reported the use of optimization strategies for TCDS schemes to detect designs with minimum energy consumption. TCDS options are more efficient because the remixing in the intermediate component, presented naturally in the conventional distillation sequences and translated into higher energy consumption, is reduced significantly, thus reducing energy requirements (Triantafyllou and Smith, 1992;Hernández et al, 2003). When comparing the energy savings of the integrated schemes, it has been found that in general the Petlyuk column offers better savings than the systems with side columns.…”

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confidence: 99%

A Short Note About Energy-Efficiency Performance of Thermally Coupled Distillation Sequences

2008

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THE CANADIAN JOURNAL OF CHEMICAL ENGINEERING 139R&D NOTE D istillation is a widely used separation method in the process industries and it is the largest energy consumer among individual process units. Improvement of energy efficiency in distillation systems is still an active research field. Among the issues concerned with the improvement of energy efficiency of distillation systems, the optimal design and synthesis of multicomponent distillation schemes is still one of the most challenging problems. For optimal design of distillation systems of multicomponent separations, thermally coupled distillationIn this work, we present a comparative study of the energy-efficiency performance between conventional distillation sequences and thermally coupled distillation arrangements (TCDS) for the separation of ternary mixtures of hydrocarbons under the action of feedback control loops. The influence of the relative ease of separation of the feed mixture and its composition was analyzed. The feedback analysis was conducted through servo tests with individual changes in the set points for each of the three product streams. Standard PI controllers were used for each loop. The results show an apparent trend regarding the sequence with a better dynamic performance. Generally, TCDS options performed better for the control of the extreme components of the ternary mixture (A and C), while the conventional sequences offered a better dynamic behaviour for the control of the intermediate component (B). The only case in which there was a dominant structure for all control loops was when the feed contained low amounts of the intermediate component and the mixture had similar relative volatilities. The Petlyuk column provided the optimal choice in such case, which contradicts the general expectations regarding its control behaviour. In addition, the energy demands during the dynamic responses were significantly lower than those observed for the other distillation sequences. TCDS options, therefore, are not only more energy efficient than the conventional sequences, but there are cases in which they also offer better feedback control properties.On présente dans ce travail une étude comparative de la performance d'efficacité d'énergétique entre les séquences de distillation conventionnelles et les configurations de distillation couplées thermiquement (TCDS) pour la séparation de mélanges ternaires d'hydrocarbures sous l'action de boucles de contrôle d'asservissement. L'influence de la facilité relative de séparation du mélange d'alimentation et de sa composition est analysée. L'analyse de rétroalimentation est réalisée grâce à des tests d'asservissement avec des changements individuels dans les points de consigne pour chacun des trois courants de produits. Des contrôleurs PI standards ont été utilisés pour chaque boucle. Les résultats montrent une tendance apparente pour la séquence ayant une meilleure performance dynamique. Généralement, les options TCDS sont meilleures pour le contrôle des composantes extrêmes du mélange ternaire (A ...

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Energy Efficiency of an Indirect Thermally Coupled Distillation Sequence

Cited by 54 publications

References 7 publications

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

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

Controllability analysis of thermally coupled distillation sequences for five—Component mixtures

A Short Note About Energy-Efficiency Performance of Thermally Coupled Distillation Sequences

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