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Thermodynamic Comparison of the Steam Ejectors Integrated at Different Locations in Cogeneration Systems

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  • Shifei Zhao

    (School of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
    These authors contributed equally to this work.)

  • Chunlan Wang

    (School of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
    These authors contributed equally to this work.)

  • Fan Duan

    (School of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

  • Ze Tian

    (School of Energy and Power Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China)

Abstract

Under the challenge of global energy transition, coal-fired cogeneration systems are undergoing a technical revolution towards enhanced efficiency, heating capacity, and flexibility. In this paper, four schemes using a steam ejector integrated into a cogeneration system are designed. Considering operational safety, integrated locations are selected at the front and back of high- and medium-pressure turbines. Subsequently, the thermodynamic and operational characteristics under both design and off-design conditions are analyzed based on a model built in EBSILON Professional. Finally, a sensitivity analysis of the heating process is conducted. The results show that the integration of steam ejectors can increase the waste heat recovery ratio of exhaust steam by 18.42–45.61% under design conditions. The largest waste heat recovery ratio is obtained in System 4, resulting in the power generation efficiency ( η g ) and gross energy utilization efficiency ( η p ) of 81.95% and 65.53%, respectively. Meanwhile, the steam ejector can expand the power-load regulation range of the cogeneration system, and System 4 has the lowest lower power limit among all the systems. The η p values of Systems 1–4 reach extreme values at different mixed steam pressures of the ejector. Increasing the pinch point temperature difference reduces the power load η g and η p of Systems 1–4. The results provide technical solutions for improving the heating capacity and efficient and flexible operation of cogeneration systems.

Suggested Citation

  • Shifei Zhao & Chunlan Wang & Fan Duan & Ze Tian, 2024. "Thermodynamic Comparison of the Steam Ejectors Integrated at Different Locations in Cogeneration Systems," Energies, MDPI, vol. 17(11), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:11:p:2463-:d:1398990
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    References listed on IDEAS

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    1. Wang, Jiawei & You, Shi & Zong, Yi & Træholt, Chresten & Dong, Zhao Yang & Zhou, You, 2019. "Flexibility of combined heat and power plants: A review of technologies and operation strategies," Applied Energy, Elsevier, vol. 252(C), pages 1-1.
    2. Adrian Neacșa & Mirela Panait & Jianu Daniel Mureșan & Marian Catalin Voica & Otilia Manta, 2022. "The Energy Transition between Desideratum and Challenge: Are Cogeneration and Trigeneration the Best Solution?," IJERPH, MDPI, vol. 19(5), pages 1-22, March.
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