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Liquid level expansion in steam drum during transient operation of molten-salt-steam-generator-system

Author

Listed:
  • Yu, Yupu
  • Xie, Jian
  • Xu, Jinliang
  • Zhao, Yuwei
  • Chen, Xueshuo
  • Dong, Xinyu
  • Wang, Qinghua

Abstract

To balance unstable renewable energies, a molten-salt-energy-storage-system is integrated with a coal-fired power plant (CFPP) to increase its flexibility. In a 350 MW CFPP with an ultra-fast load ramp rate of 6% Pe/min, the molten-salt-steam-generator-system (MSSG) should supply 3% Pe/min independently. The correspondingly thermal load variation rate of the MSSG reaches 23% Pt/min, which impose fast transients on the drum level of the natural circulation steam generator. The transient thermal-hydraulic model of the MSSG is established in ASYST, by which the dynamic characteristics of the MSSG is simulated. It was found that the MSSG demonstrated the capability to meet the objective provided the liquid level expansion problem is solved. The drum level is dominated by the temporal-spatial void fraction distribution in MSSG, which is influenced by the flashing effect and the thermal load. The flashing effect contribution follows parabola evolution, reaching up to 35.6%. The influence of the thermal load is related to the thermal inertia of the natural circulation, in which the driving force always lags behind the thermal load. The proposed equivalent volume method overcomes the limitations of the classical design method, and solved the level expansion problem, providing critical guidelines for design and operation of steam generator.

Suggested Citation

  • Yu, Yupu & Xie, Jian & Xu, Jinliang & Zhao, Yuwei & Chen, Xueshuo & Dong, Xinyu & Wang, Qinghua, 2025. "Liquid level expansion in steam drum during transient operation of molten-salt-steam-generator-system," Energy, Elsevier, vol. 334(C).
    • Handle: RePEc:eee:energy:v:334:y:2025:i:c:s0360544225031718
    DOI: 10.1016/j.energy.2025.137529
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    References listed on IDEAS

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    1. Richter, Marcel & Oeljeklaus, Gerd & Görner, Klaus, 2019. "Improving the load flexibility of coal-fired power plants by the integration of a thermal energy storage," Applied Energy, Elsevier, vol. 236(C), pages 607-621.
    2. Zhao, Yongliang & Wang, Chaoyang & Liu, Ming & Chong, Daotong & Yan, Junjie, 2018. "Improving operational flexibility by regulating extraction steam of high-pressure heaters on a 660 MW supercritical coal-fired power plant: A dynamic simulation," Applied Energy, Elsevier, vol. 212(C), pages 1295-1309.
    3. Yao, Lingxiang & Xiao, Xianyong & Wang, Yang & Yao, Xiaoming & Ma, Zhicheng, 2022. "Dynamic modeling and hierarchical control of a concentrated solar power plant with direct molten salt storage," Energy, Elsevier, vol. 252(C).
    4. Wojciech Kosman & Andrzej Rusin, 2020. "The Application of Molten Salt Energy Storage to Advance the Transition from Coal to Green Energy Power Systems," Energies, MDPI, vol. 13(9), pages 1-18, May.
    5. Zhang, Shunqi & Liu, Ming & Zhao, Yongliang & Liu, Jiping & Yan, Junjie, 2021. "Dynamic simulation and performance analysis of a parabolic trough concentrated solar power plant using molten salt during the start-up process," Renewable Energy, Elsevier, vol. 179(C), pages 1458-1471.
    6. Zhang, Qijun & Dong, Jianning & Chen, Heng & Feng, Fuyuan & Xu, Gang & Wang, Xiuyan & Liu, Tong, 2024. "Dynamic characteristics and economic analysis of a coal-fired power plant integrated with molten salt thermal energy storage for improving peaking capacity," Energy, Elsevier, vol. 290(C).
    7. Qiu, Yu & Li, Ming-Jia & Wang, Wen-Qi & Du, Bao-Cun & Wang, Kun, 2018. "An experimental study on the heat transfer performance of a prototype molten-salt rod baffle heat exchanger for concentrated solar power," Energy, Elsevier, vol. 156(C), pages 63-72.
    8. Kubik, M.L. & Coker, P.J. & Barlow, J.F., 2015. "Increasing thermal plant flexibility in a high renewables power system," Applied Energy, Elsevier, vol. 154(C), pages 102-111.
    9. Ma, Tingshan & Li, Zhengkuan & Lv, Kai & Chang, Dongfeng & Hu, Wenshuai & Zou, Ying, 2024. "Design and performance analysis of deep peak shaving scheme for thermal power units based on high-temperature molten salt heat storage system," Energy, Elsevier, vol. 288(C).
    10. González-Gómez, P.A. & Gómez-Hernández, J. & Briongos, J.V. & Santana, D., 2018. "Transient thermo-mechanical analysis of steam generators for solar tower plants," Applied Energy, Elsevier, vol. 212(C), pages 1051-1068.
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