Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation units

High accuracy in Equations of State (EoSs) is becoming a more and more critical aspect for design and operational purposes in different areas of chemical and process engineering. It is well-known that improper predictions of mixture properties provide large deviations in process simulations, process...

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Main Authors: Filippo Bisotti, Andrea Galeazzi, Luca Galatioto, Fabio Masserdotti, Alessandro Bigi, Pierluigi Gritti, Flavio Manenti
Format: Article
Language:English
Published: Elsevier 2021-05-01
Series:International Journal of Thermofluids
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2666202721000215
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author Filippo Bisotti
Andrea Galeazzi
Luca Galatioto
Fabio Masserdotti
Alessandro Bigi
Pierluigi Gritti
Flavio Manenti
author_facet Filippo Bisotti
Andrea Galeazzi
Luca Galatioto
Fabio Masserdotti
Alessandro Bigi
Pierluigi Gritti
Flavio Manenti
author_sort Filippo Bisotti
collection DOAJ
description High accuracy in Equations of State (EoSs) is becoming a more and more critical aspect for design and operational purposes in different areas of chemical and process engineering. It is well-known that improper predictions of mixture properties provide large deviations in process simulations, process control actions, estimation of operative conditions, assessment of performance indexes and optimal unit/process design. These deviations are strongly emphasized when typical operating conditions appear rather severe. One of the most challenging application sectors is represented by cryogenic separations and especially in case their nominal operating conditions approach the critical point. Air Separation Units (ASUs) are the ideal application field to demonstrate these criticisms. In addition, dedicated EoSs sometimes lacks in implementation details and thermodynamic parameters, making the reliability target impossible to be achieved. The present paper is aimed at bridging the current gaps in the implementation of Bender EoS for the reliable prediction of air mixture properties as well as the reliable simulation of ASU plants. The implementation requires the description of robust and efficient algorithms. At last, a quantitative comparison between the proposed approach and the existing solutions is provided.
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spelling doaj.art-fa3a20fe09164c1584d4f075f7ad57ce2022-12-21T18:45:38ZengElsevierInternational Journal of Thermofluids2666-20272021-05-0110100083Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation unitsFilippo Bisotti0Andrea Galeazzi1Luca Galatioto2Fabio Masserdotti3Alessandro Bigi4Pierluigi Gritti5Flavio Manenti6Politecnico di Milano, CMIC Dept. “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133 Milan, ItalyPolitecnico di Milano, CMIC Dept. “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133 Milan, ItalySIAD Macchine e Impianti, Via San Bernardino 92, 24100 Bergamo, ItalySIAD Macchine e Impianti, Via San Bernardino 92, 24100 Bergamo, ItalySIAD Macchine e Impianti, Via San Bernardino 92, 24100 Bergamo, ItalySIAD Macchine e Impianti, Via San Bernardino 92, 24100 Bergamo, ItalyPolitecnico di Milano, CMIC Dept. “Giulio Natta”, Piazza Leonardo da Vinci 32, 20133 Milan, Italy; Corresponding author.High accuracy in Equations of State (EoSs) is becoming a more and more critical aspect for design and operational purposes in different areas of chemical and process engineering. It is well-known that improper predictions of mixture properties provide large deviations in process simulations, process control actions, estimation of operative conditions, assessment of performance indexes and optimal unit/process design. These deviations are strongly emphasized when typical operating conditions appear rather severe. One of the most challenging application sectors is represented by cryogenic separations and especially in case their nominal operating conditions approach the critical point. Air Separation Units (ASUs) are the ideal application field to demonstrate these criticisms. In addition, dedicated EoSs sometimes lacks in implementation details and thermodynamic parameters, making the reliability target impossible to be achieved. The present paper is aimed at bridging the current gaps in the implementation of Bender EoS for the reliable prediction of air mixture properties as well as the reliable simulation of ASU plants. The implementation requires the description of robust and efficient algorithms. At last, a quantitative comparison between the proposed approach and the existing solutions is provided.http://www.sciencedirect.com/science/article/pii/S2666202721000215Air mixtureAir separation unitsBender equation of stateBubble and dew point problemsNon-cubic equation of state (NCEoS)Robust and efficient algorithm
spellingShingle Filippo Bisotti
Andrea Galeazzi
Luca Galatioto
Fabio Masserdotti
Alessandro Bigi
Pierluigi Gritti
Flavio Manenti
Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation units
International Journal of Thermofluids
Air mixture
Air separation units
Bender equation of state
Bubble and dew point problems
Non-cubic equation of state (NCEoS)
Robust and efficient algorithm
title Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation units
title_full Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation units
title_fullStr Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation units
title_full_unstemmed Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation units
title_short Implementing robust thermodynamic model for reliable bubble/dew problem solution in cryogenic distillation of air separation units
title_sort implementing robust thermodynamic model for reliable bubble dew problem solution in cryogenic distillation of air separation units
topic Air mixture
Air separation units
Bender equation of state
Bubble and dew point problems
Non-cubic equation of state (NCEoS)
Robust and efficient algorithm
url http://www.sciencedirect.com/science/article/pii/S2666202721000215
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