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Can solar tower plants withstand the operational flexibility of combined cycle plants?

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  • González-Gómez, P.A.
  • Gómez-Hernández, J.
  • Ruiz, C.
  • Santana, D.

Abstract

The aim of this work is to investigate the level of reliability of a 100 MWe solar tower plant operating as a load-following plant using actual operational data of combined cycle power plants. Despite the low cost, the steam generator has been identified as the main cause of unavailability of solar tower plants due to fatigue failures of tube-to-tubesheet joints, which can lead to steam/water leakage into the heat transfer fluid circuit, putting the plant performance at risk. A methodology based on the ASME code and EN standards is proposed to predict the fatigue failures of critical welded points of the steam generator, such as tube-to-tubesheet joints and other T-joints. The results show that the forced outages due to failures of the steam generator lead to an energy penalty that ranges over 230–453 GWh over the plant lifetime. The associated annual degradation rate ranges over 0.123–0.244%. Three tube leakage repair strategies are compared: tube-to-tubesheet weld crack repair, tube plugging and tube plugging with steam generator replacement. The latter strategy was shown to be the best practice because the lowest levelized cost of energy was obtained. In addition, the design of heat exchangers with a minimum of 20% extra area is highly recommended to not compromise the plant operation due to tube plugging. Last, the load-following operation of the solar tower plant increases the levelized cost of energy by approximately 1.6% in the case of tube repair and approximately 0.8% in the case of tube plugging with steam generator replacement.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:appene:v:314:y:2022:i:c:s0306261922003671
    DOI: 10.1016/j.apenergy.2022.118951
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    References listed on IDEAS

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    1. Stoppato, A. & Mirandola, A. & Meneghetti, G. & Lo Casto, E., 2012. "On the operation strategy of steam power plants working at variable load: Technical and economic issues," Energy, Elsevier, vol. 37(1), pages 228-236.
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    5. González-Gómez, P.A. & Gómez-Hernández, J. & Briongos, J.V. & Santana, D., 2018. "Fatigue analysis of the steam generator of a parabolic trough solar power plant," Energy, Elsevier, vol. 155(C), pages 565-577.
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    Cited by:

    1. Shakibi, Hamid & Shokri, Afshar & Assareh, Ehsanolah & Yari, Mortaza & Lee, Moonyong, 2023. "Using machine learning approaches to model and optimize a combined solar/natural gas-based power and freshwater cogeneration system," Applied Energy, Elsevier, vol. 333(C).
    2. Arnaoutakis, Georgios E. & Katsaprakakis, Dimitris Al. & Christakis, Dimitris G., 2022. "Dynamic modeling of combined concentrating solar tower and parabolic trough for increased day-to-day performance," Applied Energy, Elsevier, vol. 323(C).
    3. 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.

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