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Design optimization and structural assessment of a header and coil steam generator for load-following solar tower plants

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  • González-Gómez, P.A.
  • Laporte-Azcué, M.
  • Fernández-Torrijos, M.
  • Santana, D.

Abstract

The aim of this work is to explore the capabilities, from heat transfer and structural point of view, of a novel header and coil steam generator for a 100 MWe solar tower plant using molten-salt as heat transfer fluid. A methodology for the design and economic optimization of the header and coil steam generator is presented, paying special attention to the structural assessment which considers complex phenomena such creep-fatigue and stress relaxation due to the high working temperatures of solar tower plants. The results showed that header and coil steam generators provide economically effective overall heat transfer coefficients with lower pressure drops on the shell side compared to conventional shell-and-tube steam generators, leading to a reduction in the annual pumping costs of around 3.6 times. The structural assessment reveals that the critical points are located in the headers of superheater, reheater and evaporator. Different redesign actions have been performed to increase the lifetime in the critical points without affecting to the optimum thermo-economic solutions. Finally, the results showed that the header and coil steam generator is able to operate with fast daily startups at 6.1 K/min, a ramp-up 2.4 times higher than conventional shell-and-tube steam generators.

Suggested Citation

  • González-Gómez, P.A. & Laporte-Azcué, M. & Fernández-Torrijos, M. & Santana, D., 2022. "Design optimization and structural assessment of a header and coil steam generator for load-following solar tower plants," Renewable Energy, Elsevier, vol. 192(C), pages 456-471.
    • Handle: RePEc:eee:renene:v:192:y:2022:i:c:p:456-471
    DOI: 10.1016/j.renene.2022.04.130
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    References listed on IDEAS

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    1. Li, Xiaolei & Xu, Ershu & Ma, Linrui & Song, Shuang & Xu, Li, 2019. "Modeling and dynamic simulation of a steam generation system for a parabolic trough solar power plant," Renewable Energy, Elsevier, vol. 132(C), pages 998-1017.
    2. González-Gómez, P.A. & Petrakopoulou, F. & Briongos, J.V. & Santana, D., 2017. "Cost-based design optimization of the heat exchangers in a parabolic trough power plant," Energy, Elsevier, vol. 123(C), pages 314-325.
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    5. González-Gómez, P.A. & Gómez-Hernández, J. & Ruiz, C. & Santana, D., 2022. "Can solar tower plants withstand the operational flexibility of combined cycle plants?," Applied Energy, Elsevier, vol. 314(C).
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    7. del Río, Pablo & Peñasco, Cristina & Mir-Artigues, Pere, 2018. "An overview of drivers and barriers to concentrated solar power in the European Union," Renewable and Sustainable Energy Reviews, Elsevier, vol. 81(P1), pages 1019-1029.
    8. Gómez-Hernández, J. & González-Gómez, P.A. & Briongos, J.V. & Santana, D., 2018. "Influence of the steam generator on the exergetic and exergoeconomic analysis of solar tower plants," Energy, Elsevier, vol. 145(C), pages 313-328.
    9. Ferruzza, Davide & Kærn, Martin Ryhl & Haglind, Fredrik, 2019. "Design of header and coil steam generators for concentrating solar power applications accounting for low-cycle fatigue requirements," Applied Energy, Elsevier, vol. 236(C), pages 793-803.
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