An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit

Jozsef Gaspar, Tobias Kasper Skovborg Ritschel, John Bagterp Jørgensen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Cryogenic air separation (CAS) is the leading technology for large scale production of pure N2, O2 and Ar. This process is very electric-energy intensive; thus it is a likely candidate for load balancing of power stations in a smart grid. This type of intermittent operation of CAS, requires a non-linear model based control to achieve optimal techno-economic performance. Accordingly, this work presents a computationally efficient and novel approach for solving a tray-by-tray equilibrium model and its implementation for open-loop optimal-control of a cryogenic distillation column. Here, the optimisation objective is to reduce the cost of compression in a volatile electricity market while meeting the production requirements, i.e. product flow rate and purity. This model is implemented in Matlab and uses the ThermoLib rigorous thermodynamic library. The present work represents a first step towards plant-wide dynamic modelling and smart control of a cryogenic distillation plant.
Original languageEnglish
Title of host publicationProceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27
Volume40
PublisherElsevier
Publication date2017
Pages1543-1548
DOIs
Publication statusPublished - 2017
Event27th European Symposium on Computer Aided Process Engineering - Barcelona, Spain
Duration: 1 Oct 20175 Oct 2017
Conference number: 27
https://www.elsevier.com/books/27th-european-symposium-on-computer-aided-process-engineering/espuna/978-0-444-63965-3

Conference

Conference27th European Symposium on Computer Aided Process Engineering
Number27
CountrySpain
CityBarcelona
Period01/10/201705/10/2017
Internet address
SeriesComputer Aided Chemical Engineering
Volume40
ISSN1570-7946

Keywords

  • Cryogenic air separation
  • Load balancing
  • Distillation column
  • Dynamic modeling
  • Optimal-control

Cite this

Gaspar, J., Ritschel, T. K. S., & Jørgensen, J. B. (2017). An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit. In Proceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27 (Vol. 40, pp. 1543-1548). Elsevier. Computer Aided Chemical Engineering, Vol.. 40 https://doi.org/10.1016/B978-0-444-63965-3.50259-2
Gaspar, Jozsef ; Ritschel, Tobias Kasper Skovborg ; Jørgensen, John Bagterp. / An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit. Proceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27. Vol. 40 Elsevier, 2017. pp. 1543-1548 (Computer Aided Chemical Engineering, Vol. 40).
@inproceedings{eaff5ec344104f029a89c86080b1f3e6,
title = "An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit",
abstract = "Cryogenic air separation (CAS) is the leading technology for large scale production of pure N2, O2 and Ar. This process is very electric-energy intensive; thus it is a likely candidate for load balancing of power stations in a smart grid. This type of intermittent operation of CAS, requires a non-linear model based control to achieve optimal techno-economic performance. Accordingly, this work presents a computationally efficient and novel approach for solving a tray-by-tray equilibrium model and its implementation for open-loop optimal-control of a cryogenic distillation column. Here, the optimisation objective is to reduce the cost of compression in a volatile electricity market while meeting the production requirements, i.e. product flow rate and purity. This model is implemented in Matlab and uses the ThermoLib rigorous thermodynamic library. The present work represents a first step towards plant-wide dynamic modelling and smart control of a cryogenic distillation plant.",
keywords = "Cryogenic air separation, Load balancing, Distillation column, Dynamic modeling, Optimal-control",
author = "Jozsef Gaspar and Ritschel, {Tobias Kasper Skovborg} and J{\o}rgensen, {John Bagterp}",
year = "2017",
doi = "10.1016/B978-0-444-63965-3.50259-2",
language = "English",
volume = "40",
series = "Computer Aided Chemical Engineering",
publisher = "Elsevier",
pages = "1543--1548",
booktitle = "Proceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27",
address = "United Kingdom",

}

Gaspar, J, Ritschel, TKS & Jørgensen, JB 2017, An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit. in Proceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27. vol. 40, Elsevier, Computer Aided Chemical Engineering, vol. 40, pp. 1543-1548, 27th European Symposium on Computer Aided Process Engineering, Barcelona, Spain, 01/10/2017. https://doi.org/10.1016/B978-0-444-63965-3.50259-2

An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit. / Gaspar, Jozsef; Ritschel, Tobias Kasper Skovborg; Jørgensen, John Bagterp.

Proceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27. Vol. 40 Elsevier, 2017. p. 1543-1548 (Computer Aided Chemical Engineering, Vol. 40).

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

T1 - An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit

AU - Gaspar, Jozsef

AU - Ritschel, Tobias Kasper Skovborg

AU - Jørgensen, John Bagterp

PY - 2017

Y1 - 2017

N2 - Cryogenic air separation (CAS) is the leading technology for large scale production of pure N2, O2 and Ar. This process is very electric-energy intensive; thus it is a likely candidate for load balancing of power stations in a smart grid. This type of intermittent operation of CAS, requires a non-linear model based control to achieve optimal techno-economic performance. Accordingly, this work presents a computationally efficient and novel approach for solving a tray-by-tray equilibrium model and its implementation for open-loop optimal-control of a cryogenic distillation column. Here, the optimisation objective is to reduce the cost of compression in a volatile electricity market while meeting the production requirements, i.e. product flow rate and purity. This model is implemented in Matlab and uses the ThermoLib rigorous thermodynamic library. The present work represents a first step towards plant-wide dynamic modelling and smart control of a cryogenic distillation plant.

AB - Cryogenic air separation (CAS) is the leading technology for large scale production of pure N2, O2 and Ar. This process is very electric-energy intensive; thus it is a likely candidate for load balancing of power stations in a smart grid. This type of intermittent operation of CAS, requires a non-linear model based control to achieve optimal techno-economic performance. Accordingly, this work presents a computationally efficient and novel approach for solving a tray-by-tray equilibrium model and its implementation for open-loop optimal-control of a cryogenic distillation column. Here, the optimisation objective is to reduce the cost of compression in a volatile electricity market while meeting the production requirements, i.e. product flow rate and purity. This model is implemented in Matlab and uses the ThermoLib rigorous thermodynamic library. The present work represents a first step towards plant-wide dynamic modelling and smart control of a cryogenic distillation plant.

KW - Cryogenic air separation

KW - Load balancing

KW - Distillation column

KW - Dynamic modeling

KW - Optimal-control

U2 - 10.1016/B978-0-444-63965-3.50259-2

DO - 10.1016/B978-0-444-63965-3.50259-2

M3 - Article in proceedings

VL - 40

T3 - Computer Aided Chemical Engineering

SP - 1543

EP - 1548

BT - Proceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27

PB - Elsevier

ER -

Gaspar J, Ritschel TKS, Jørgensen JB. An efficient and rigorous thermodynamic library and optimal-control of a cryogenic air separation unit. In Proceedings of the 27th European Symposium on Computer Aided Process Engineering – ESCAPE 27. Vol. 40. Elsevier. 2017. p. 1543-1548. (Computer Aided Chemical Engineering, Vol. 40). https://doi.org/10.1016/B978-0-444-63965-3.50259-2