Thermomechanical testing under operating conditions of A516Gr70 used for CSP storage tanks

Prieto, Cristina; Barreneche Güerisoli, Camila; Martínez, Mònica; Cabeza, Luisa F.; Fernández Renna, Ana Inés

doi:https://doi.org/10.1016/j.solmat.2017.09.029

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2018

Author

Prieto, Cristina

Barreneche Güerisoli, Camila

Martínez, Mònica

Cabeza, Luisa F.

Fernández Renna, Ana Inés

Abstract

Thermal energy storage (TES) in molten salts is the storage dominating technology in solar power applications today. In two-tank molten salt storage systems energy density ranges from 30 to 70 kW h/m3 are achievable. The salt material used is a binary system, composed of 60% NaNO3 and 40% KNO3. In the

8 MWhth pilot plant built and tested by Abengoa, the storage tanks were made of steel A516Gr.70 using the Appendix M of code API 650 for their design. A specific testing device was developed to evaluate thermo-mechanical properties, and a study was conducted in order to evaluate tensile properties of A516Gr.70 specimens under operation conditions for the hot tank at the pilot plant that is in contact with molten salts at 380 °C. Results confirmed the outcomes of the work: the reduction of the yield limit, elongation before fracture, and Young modulus at 380 °C after having been 5 min immersed in molten salts. Moreover, after a creep-test simulating operating 7 days conditions during, an additional reduction of the yield limit was measured.

URI

http://hdl.handle.net/10459.1/60308

DOI

https://doi.org/10.1016/j.solmat.2017.09.029

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Solar Energy Materials and Solar Cells, 2018, vol. 174, p. 509-514

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Except where otherwise noted, this item's license is described as cc-by-nc-nd, (c) Elsevier, 2017