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Exergy analysis of two cryogenic air separation processes

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  • van der Ham, L.V.
  • Kjelstrup, S.

Abstract

Two process designs of a cryogenic ASU (air separation unit) have been evaluated using exergy analysis. The ASU is part of an IGCC (integrated gasification combined cycle); it is supplying oxygen and nitrogen to the gasifier and nitrogen to the gas turbine. The two process designs separate the same feed into products with the same specifications. They differ in the number of distillation columns that are used; either two or three. Addition of the third column reduced the exergy destruction in the distillation section with 31%. Overall, the three-column design destroyed 12% less exergy than the two-column design. The rational exergy efficiency is defined as the desired exergy change divided by the total exergy change; it is 38% for the three-column design and 35% for the two-column design. Almost half of the exergy destruction is located in compressor after-coolers. Using this heat of compression elsewhere in the IGCC can be an important way to increase the IGCC efficiency. It is proposed to use it for the pre-heating of ASU products or for the production of steam, which can be used as part of the steam turbine cycle.

Suggested Citation

  • van der Ham, L.V. & Kjelstrup, S., 2010. "Exergy analysis of two cryogenic air separation processes," Energy, Elsevier, vol. 35(12), pages 4731-4739.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:12:p:4731-4739
    DOI: 10.1016/j.energy.2010.09.019
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    1. Bhattacharya, Atmadeep & Das, Anirban & Datta, Amitava, 2014. "Exergy based performance analysis of hydrogen production from rice straw using oxygen blown gasification," Energy, Elsevier, vol. 69(C), pages 525-533.
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    3. Matsuda, Kazuo & Kawazuishi, Kenichi & Kansha, Yasuki & Fushimi, Chihiro & Nagao, Masaki & Kunikiyo, Hiroshi & Masuda, Fusao & Tsutsumi, Atsushi, 2011. "Advanced energy saving in distillation process with self-heat recuperation technology," Energy, Elsevier, vol. 36(8), pages 4640-4645.
    4. Ebrahimi, Armin & Ziabasharhagh, Masoud, 2017. "Optimal design and integration of a cryogenic Air Separation Unit (ASU) with Liquefied Natural Gas (LNG) as heat sink, thermodynamic and economic analyses," Energy, Elsevier, vol. 126(C), pages 868-885.
    5. Khoa, T.D. & Shuhaimi, M. & Nam, H.M., 2012. "Application of three dimensional exergy analysis curves for absorption columns," Energy, Elsevier, vol. 37(1), pages 273-280.
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    8. Qin, Shiyue & Chang, Shiyan & Yao, Qiang, 2018. "Modeling, thermodynamic and techno-economic analysis of coal-to-liquids process with different entrained flow coal gasifiers," Applied Energy, Elsevier, vol. 229(C), pages 413-432.
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    10. Zonouz, Masood Jalali & Mehrpooya, Mehdi, 2017. "Parametric study of a hybrid one column air separation unit (ASU) and CO2 power cycle based on advanced exergy cost analysis results," Energy, Elsevier, vol. 140(P1), pages 261-275.
    11. Piadehrouhi, Forough & Ghorbani, Bahram & Miansari, Mehdi & Mehrpooya, Mehdi, 2019. "Development of a new integrated structure for simultaneous generation of power and liquid carbon dioxide using solar dish collectors," Energy, Elsevier, vol. 179(C), pages 938-959.
    12. Singla, Rohit & Chowdhury, Kanchan, 2020. "Saving power by modifying a double column air separation plant to produce high and low purity pressurized gaseous oxygen simultaneously," Energy, Elsevier, vol. 210(C).
    13. Fu, Qian & Kansha, Yasuki & Song, Chunfeng & Liu, Yuping & Ishizuka, Masanori & Tsutsumi, Atsushi, 2016. "A cryogenic air separation process based on self-heat recuperation for oxy-combustion plants," Applied Energy, Elsevier, vol. 162(C), pages 1114-1121.
    14. Akbari, Maryam & Oyedun, Adetoyese Olajire & Kumar, Amit, 2018. "Ammonia production from black liquor gasification and co-gasification with pulp and waste sludges: A techno-economic assessment," Energy, Elsevier, vol. 151(C), pages 133-143.
    15. Andrey Rogalev & Nikolay Rogalev & Vladimir Kindra & Olga Zlyvko & Andrey Vegera, 2021. "A Study of Low-Potential Heat Utilization Methods for Oxy-Fuel Combustion Power Cycles," Energies, MDPI, vol. 14(12), pages 1-14, June.
    16. 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.
    17. Paweł Ziółkowski & Stanisław Głuch & Piotr Józef Ziółkowski & Janusz Badur, 2022. "Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture," Energies, MDPI, vol. 15(7), pages 1-39, April.
    18. Wang, Maojian & Liu, Guilian & Hui, Chi Wai, 2016. "Simultaneous optimization and integration of gas turbine and air separation unit in IGCC plant," Energy, Elsevier, vol. 116(P2), pages 1294-1301.
    19. Thomas, Rijo Jacob & Ghosh, Parthasarathi & Chowdhury, Kanchan, 2012. "Application of exergy analysis in designing helium liquefiers," Energy, Elsevier, vol. 37(1), pages 207-219.
    20. Mehrpooya, Mehdi & Moftakhari Sharifzadeh, Mohammad Mehdi & Rosen, Marc A., 2015. "Optimum design and exergy analysis of a novel cryogenic air separation process with LNG (liquefied natural gas) cold energy utilization," Energy, Elsevier, vol. 90(P2), pages 2047-2069.
    21. Fu, Chao & Gundersen, Truls, 2012. "Using exergy analysis to reduce power consumption in air separation units for oxy-combustion processes," Energy, Elsevier, vol. 44(1), pages 60-68.
    22. Dan Fernandes & Song Wang & Qiang Xu & Russel Buss & Daniel Chen, 2019. "Process and Carbon Footprint Analyses of the Allam Cycle Power Plant Integrated with an Air Separation Unit," Clean Technol., MDPI, vol. 1(1), pages 1-16, October.
    23. Pio, D.T. & Tarelho, L.A.C. & Pinto, P.C.R., 2020. "Gasification-based biorefinery integration in the pulp and paper industry: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).

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