Corrosion inhibitors for TES material at high temperature for CSP plants
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Molten salt technology using nitrate salts as thermal energy storage material is the current state-of-the-art of concentrated solar power technology and power tower central receivers are currently limited by the maximum operating temperature of their working fluid. The limit of solar salt (60wt.%NaNO3 + 40wt.%KNO3) thermal stability is around 565°C with ambient air as the cover gas. In order to obtain higher efficiency goals using molten salt technologies working at higher temperatures (e.g., 650°C to 750°C), a different salt chemistry is required for new generation of CSP plants and chlorides molten salts could be a feasible option. Corrosion mitigation could solve the current issues related with the use of chloride salt at high temperature. In this work, the proposal of different corrosion mitigation strategies has been evaluated, as well as the identification of the most corrosive impurities present in the ternary chloride salt composed by MgCl2/KCl/NaCl (60/20/20 mol%). For this purpose, electrochemical impedance spectroscopy tests were carried out at 700°C on austenitic stainless steel (AISI 304) and a Ni base alloy (Inconel 702) during 100 hours. In this case, MgOHCl was identified as the main important corrosive impurity, present in the chloride salt, to control in the storage system. Regarding the materials tested, Ni base alloy (Inconel 702) showed the most promising results for their use as container material.
Is part ofEurotherm Seminar #112 - Advances in Thermal Energy Storage. Universitat de Lleida, 15-17th May 2019. Edicions de la Universitat de Lleida. ISBN: 978-84-9144-155-7. pp. R-108-1 - R-108-7
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Corrosion evaluation of eutectic chloride molten salt for new generation of CSP plants. Part 1: Thermal treatment assessment Fernández, Ángel G.; Cabeza, Luisa F. (Elsevier, 2020)The operating temperature of a steam turbine is limited to 565 ºC by the molten nitrate heat-transfer fluid; therefore, a new molten salt chemistry is needed to increase the maximum operating temperature in the new generation ...
Cathodic Protection Using Aluminum Metal in Chloride Molten Salts as Thermal Energy Storage Material in Concentrating Solar Power Plants Fernández, Ángel G.; Cabeza, Luisa F. (MDPI, 2020)The new generation of concentrated solar power (CSP) plants to be developed presents a great challenge related to the increase in maximum operating temperature since molten salt CSP technologies require alternative salt ...
Molten salt corrosion mechanisms of nitrate based thermal energy storage materials for concentrated solar power plants: A review Fernández, Ángel G.; Cabeza, Luisa F. (Elsevier, 2019)Corrosion mechanisms for current heat transfer fluid and storage media used in CSP plants working at temperatures from 300°C to 600°C are reviewed in this paper. The studies found in the literature show that these mechanisms ...