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Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis

Author

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  • Muhammad Haris Hamayun

    (Department of Chemical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
    Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Lahore 54000, Pakistan)

  • Naveed Ramzan

    (Department of Chemical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan)

  • Murid Hussain

    (Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Defence Road, Lahore 54000, Pakistan)

  • Muhammad Faheem

    (Department of Chemical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan)

Abstract

Cryogenic air separation processes are widely used for the large-scale production of nitrogen and oxygen. The most widely used design for this process involves two distillation columns operating at different pressures. This work focuses on the selection of suitable cryogenic air separation process by evaluating seven alternative designs of the two-column air separation process based on detailed exergy analysis. The feed conditions (500 tons/h, and 50% relative humidity of air), product purities (99 mole% for both nitrogen and oxygen), and operational conditions (pressures of both distillation columns) are kept same in all designs. The two cryogenic distillation columns in each configuration are heat-integrated to eliminate the need for external utilities. Steady-state simulation results are used to calculate the exergy efficiency (%) of each equipment as well as its contribution toward the overall exergy destruction rate (kW) of the process. The results show that the compression section is a major source of exergy destruction, followed by the low-pressure column, and the multi-stream heat exchanger. A Petlyuk-like configuration, labeled as C1, provides the lowest exergy destruction rate.

Suggested Citation

  • Muhammad Haris Hamayun & Naveed Ramzan & Murid Hussain & Muhammad Faheem, 2020. "Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis," Energies, MDPI, vol. 13(23), pages 1-20, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6361-:d:454859
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    References listed on IDEAS

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    Cited by:

    1. Farea Asif & Muhammad Haris Hamayun & Murid Hussain & Arif Hussain & Ibrahim M. Maafa & Young-Kwon Park, 2021. "Performance Analysis of the Perhydro-Dibenzyl-Toluene Dehydrogenation System—A Simulation Study," Sustainability, MDPI, vol. 13(11), pages 1-14, June.
    2. Kazemi, Abolghasem & Moreno, Jovita & Iribarren, Diego, 2022. "Techno-economic comparison of optimized natural gas combined cycle power plants with CO2 capture," Energy, Elsevier, vol. 255(C).
    3. Miroslav Variny & Dominika Jediná & Miroslav Rimár & Ján Kizek & Marianna Kšiňanová, 2021. "Cutting Oxygen Production-Related Greenhouse Gas Emissions by Improved Compression Heat Management in a Cryogenic Air Separation Unit," IJERPH, MDPI, vol. 18(19), pages 1-32, October.
    4. Muhammad Haris Hamayun & Naveed Ramzan & Murid Hussain & Muhammad Faheem, 2021. "Reply to Variny et al. Comment on “Hamayun et al. Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis. Energies 2020, 13 , 6361”," Energies, MDPI, vol. 14(20), pages 1-5, October.
    5. Miroslav Variny & Dominika Jediná & Patrik Furda, 2021. "Comment on Hamayun et al. Evaluation of Two-Column Air Separation Processes Based on Exergy Analysis. Energies 2020, 13 , 6361," Energies, MDPI, vol. 14(20), pages 1-8, October.
    6. Michael L. Carty & Stephane Bilodeau, 2023. "Benchmarking Thermodynamic Models for Optimization of PSA Oxygen Generators," J, MDPI, vol. 6(2), pages 1-24, June.

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