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Thermodynamic analysis and numerical optimization of the NET Power oxy-combustion cycle

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  • Scaccabarozzi, Roberto
  • Gatti, Manuele
  • Martelli, Emanuele

Abstract

This paper presents a thorough thermodynamic analysis and optimization of the NET Power cycle (also called Allam cycle), a natural-gas-fired oxy-combustion cycle featuring nearly 100% CO2 capture level, very high net electric efficiency, and potentially near-zero emissions level. The main goals of this study are the systematic optimization of the cycle for the maximum efficiency, and the quantification of the effects of the modelling assumptions and equipment performance on the optimal cycle variables and efficiency. An Aspen Plus flow-sheet featuring accurate first-principle models of the main equipment units (including cooled turbine) and fluid properties (equation of state) has been developed. The influence of the cycle variables on the thermodynamic performance of the cycle is first assessed by means of sensitivity analyses. Then, the cycle variables, which maximize the net electric efficiency, are determined with PGS-COM, a black-box numerical optimization algorithm, linked to the simulation software. The corresponding maximum cycle efficiency is equal to 54.80% (with 100% CO2 capture), confirming the outstanding performance of the NET Power cycle. Moreover, the optimization indicates the existence of promising combinations of the cycle variables which lead to reduced component costs (due to the lower operating pressures and temperatures) of the most critical components, without considerably affecting the net electric efficiency. The analysis also indicates that the cooling medium temperature, the power consumption of the air separation unit, the effectiveness of the regenerator and the effectiveness of the turbine cooling system are the main factors influencing the cycle efficiency.

Suggested Citation

  • Scaccabarozzi, Roberto & Gatti, Manuele & Martelli, Emanuele, 2016. "Thermodynamic analysis and numerical optimization of the NET Power oxy-combustion cycle," Applied Energy, Elsevier, vol. 178(C), pages 505-526.
    • Handle: RePEc:eee:appene:v:178:y:2016:i:c:p:505-526
    DOI: 10.1016/j.apenergy.2016.06.060
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    1. Scaccabarozzi, R. & Gatti, M. & Campanari, S. & Martelli, E., 2021. "Solid oxide semi-closed CO2 cycle: A hybrid power cycle with 75% net efficiency and zero emissions," Applied Energy, Elsevier, vol. 290(C).
    2. Habib, Mohamed A. & Imteyaz, Binash & Nemitallah, Medhat A., 2020. "Second law analysis of premixed and non-premixed oxy-fuel combustion cycles utilizing oxygen separation membranes," Applied Energy, Elsevier, vol. 259(C).
    3. Luo, Jing & Emelogu, Ogechi & Morosuk, Tatiana & Tsatsaronis, George, 2021. "Exergy-based investigation of a coal-fired allam cycle," Energy, Elsevier, vol. 218(C).
    4. Xin, Tuantuan & Xu, Cheng & Yang, Yongping & Kindra, Vladimir & Rogalev, Andrey, 2023. "A new process splitting analytical method for the coal-based Allam cycle: Thermodynamic assessment and process integration," Energy, Elsevier, vol. 267(C).
    5. Sleiti, Ahmad K. & Al-Ammari, Wahib & Ahmed, Samer & Kapat, Jayanta, 2021. "Direct-fired oxy-combustion supercritical-CO2 power cycle with novel preheating configurations -thermodynamic and exergoeconomic analyses," Energy, Elsevier, vol. 226(C).
    6. Ong, Chong Wei & Chen, Cheng-Liang, 2021. "Intensification, optimization and economic evaluations of the CO2-capturing oxy-combustion CO2 power system integrated with the utilization of liquefied natural gas cold energy," Energy, Elsevier, vol. 234(C).
    7. 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.
    8. Lorenzo Colleoni & Alessio Sindoni & Silvia Ravelli, 2023. "Comprehensive Thermodynamic Evaluation of the Natural Gas-Fired Allam Cycle at Full Load," Energies, MDPI, vol. 16(6), pages 1-19, March.
    9. Martelli, Emanuele & Freschini, Marco & Zatti, Matteo, 2020. "Optimization of renewable energy subsidy and carbon tax for multi energy systems using bilevel programming," Applied Energy, Elsevier, vol. 267(C).
    10. Scaccabarozzi, Roberto & Tavano, Michele & Invernizzi, Costante Mario & Martelli, Emanuele, 2018. "Comparison of working fluids and cycle optimization for heat recovery ORCs from large internal combustion engines," Energy, Elsevier, vol. 158(C), pages 396-416.
    11. Mohammadpour, Mohammadreza & Houshfar, Ehsan & Ashjaee, Mehdi & Mohammadpour, Amirreza, 2021. "Energy and exergy analysis of biogas fired regenerative gas turbine cycle with CO2 recirculation for oxy-fuel combustion power generation," Energy, Elsevier, vol. 220(C).
    12. Sleiti, Ahmad K. & Al-Ammari, Wahib A., 2021. "Off-design performance analysis of combined CSP power and direct oxy-combustion supercritical carbon dioxide cycles," Renewable Energy, Elsevier, vol. 180(C), pages 14-29.
    13. Frangopoulos, Christos A., 2018. "Recent developments and trends in optimization of energy systems," Energy, Elsevier, vol. 164(C), pages 1011-1020.
    14. 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.
    15. Zhu, Zilong & Chen, Yaping & Wu, Jiafeng & Zhang, Shaobo & Zheng, Shuxing, 2019. "A modified Allam cycle without compressors realizing efficient power generation with peak load shifting and CO2 capture," Energy, Elsevier, vol. 174(C), pages 478-487.
    16. Janusz Kotowicz & Sebastian Michalski & Mateusz Brzęczek, 2019. "The Characteristics of a Modern Oxy-Fuel Power Plant," Energies, MDPI, vol. 12(17), pages 1-34, September.
    17. Zhao, Yongming & Zhao, Lifeng & Wang, Bo & Zhang, Shijie & Chi, Jinling & Xiao, Yunhan, 2018. "Thermodynamic analysis of a novel dual expansion coal-fueled direct-fired supercritical carbon dioxide power cycle," Applied Energy, Elsevier, vol. 217(C), pages 480-495.
    18. Daniele Candelaresi & Giuseppe Spazzafumo, 2023. "Production of Substitute Natural Gas Integrated with Allam Cycle for Power Generation," Energies, MDPI, vol. 16(5), pages 1-17, February.
    19. Andrey Rogalev & Nikolay Rogalev & Vladimir Kindra & Ivan Komarov & Olga Zlyvko, 2021. "Research and Development of the Oxy-Fuel Combustion Power Cycles with CO 2 Recirculation," Energies, MDPI, vol. 14(10), pages 1-18, May.
    20. Crespi, Francesco & Gavagnin, Giacomo & Sánchez, David & Martínez, Gonzalo S., 2017. "Supercritical carbon dioxide cycles for power generation: A review," Applied Energy, Elsevier, vol. 195(C), pages 152-183.
    21. Hnydiuk-Stefan, Anna & Składzień, Jan, 2017. "Analysis of supercritical coal fired oxy combustion power plant with cryogenic oxygen unit and turbo-compressor," Energy, Elsevier, vol. 128(C), pages 271-283.
    22. Sun, Enhui & Ji, Hongfu & Wang, Xiangren & Ma, Wenjing & Zhang, Lei & Xu, Jinliang, 2023. "Proposal of multistage mass storage process to approach isothermal heat rejection of semi-closed S–CO2 cycle," Energy, Elsevier, vol. 270(C).
    23. Khallaghi, Navid & Hanak, Dawid P. & Manovic, Vasilije, 2019. "Gas-fired chemical looping combustion with supercritical CO2 cycle," Applied Energy, Elsevier, vol. 249(C), pages 237-244.

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