Abstract
Concentrated solar power (CSP) plants, in the context of thermal energy storage (TES) upgrades, need to provide a timely and effective response to the corrosion process that occurs due to the effect of high temperatures, where one of the main challenges is to control its effect, and thus the costs related to the materials used. Electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) were applied in this study as a corrosion monitoring technique. The electrochemical tests were carried out on the materials AISI304, AISI430, and HR-224 immersed in a mixture of ternary salt composed of 57 wt.% KNO3 + 13 wt.% NaNO3 + 30 wt.% LiNO3 at 550 °C during 100 h of exposure and subsequently compared with solar salt. The test was also carried out on the VM12 alloy in the ternary salt with lithium content at 100 and 1000 h of exposure at 550 °C. The corrosion tests show that the materials conform to a model of protective layer in which the same results were contrasted with the chemical corrosion mechanism of nitrate mixture. According to the results obtained in this research, electrochemical techniques could be an interesting option to control corrosion in CSP plants and reduce operational risks during operation.
Highlights
Thermal energy storage (TES) is a key tool in the different systems for generation of thermal solar energy [1], thereby providing greater flexibility, dispatchability, and reliability to the electrical system.The easy integration of TES makes concentrating solar power (CSP) dispatchable and unique among all other renewable energy-generating alternatives [2]
HR‐224, way, in which the results obtained for the materials AISI 304, AISI 430, nickel‐based alloy HR‐224, ferritic steelsteel
The corrosion process of molten nitrate salts depends on several factors, and the electrochemical impedance spectroscopy (EIS)
Summary
Thermal energy storage (TES) is a key tool in the different systems for generation of thermal solar energy [1], thereby providing greater flexibility, dispatchability, and reliability to the electrical system.The easy integration of TES makes concentrating solar power (CSP) dispatchable and unique among all other renewable energy-generating alternatives [2]. Thermal energy storage (TES) is a key tool in the different systems for generation of thermal solar energy [1], thereby providing greater flexibility, dispatchability, and reliability to the electrical system. Sci. 2020, 10, 3160 depend on the improvement of different variables, such as temperature, corrosion, materials, operating conditions, among others [1,2,3,4]. One of the great challenges for TES in the framework of the new forms of solar thermal energy generation will be linked to the increase in the temperature of the working fluid in the ranges of 550–750 ◦ C [5]. One of the most important lines of research in this sense is related to TES materials, and the behaviour of heat transfer fluids (HTF) for different applications of TES systems [6] at high temperature
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
