Corrosion Monitoring Assessment on Lithium Nitrate Molten Salts as Thermal Energy Storage Material Applied to CSP Plants
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Corrosion Monitoring Assessment on Lithium Nitrate Molten Salts as Thermal Energy Storage Material Applied to CSP Plants Abdiel Mallco1,2 · Angel G. Fernández1 Received: 20 May 2019 / Revised: 28 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The development of the new generation of concentrated solar power (CSP) plants requires improvements in the thermal energy storage systems, and corrosion produced is one of the main challenges to control since this can affect the costs of the electrical generation. Electrochemical impedance spectroscopy (EIS) has been applied in this research as a corrosion monitoring technique, comparing the results with conventional gravimetric corrosion tests. Gravimetric and electrochemical tests were conducted using AISI 304 stainless steel immersed in a ternary salt mixture composed of 57 wt% K NO3 + 13 wt% NaNO3 + 30 wt% LiNO3 at 550 °C for 1000 h. The corrosion rate obtained using gravimetric and electrochemical tests was 7.8 μm/ year and 5.7 μm/year, respectively. According to the results obtained in this research, EIS techniques could be a feasible option to control corrosion in CSP plants and reduce operational risks during the molten salt thermal-electricity conversion. Keywords Thermal energy storage · Electrochemical impedance spectroscopy · Corrosion monitoring · Lithium nitrate · Concentrated solar power
Introduction Over the last few years, renewable energies have become widespread throughout the world. This has allowed different technologies to play an important role in applied research [1]. In this sense, most of the applications related to the use of solar energy have been studied and analyzed depending on the type of application and technology [2]. * Angel G. Fernández [email protected] 1
Centro de Desarrollo Energético de Antofagasta, Universidad de Antofagasta, Av. Universidad de Antofagasta, 02800 Antofagasta, Chile
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Departamento de Ingeniería Mecánica, Universidad de Antofagasta, Av. Universidad de Antofagasta, 02800 Antofagasta, Chile
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Oxidation of Metals
In this direction, concentrated solar power (CSP) technology concentrates and stores solar energy in the form of heat, using low-cost materials that are chemically stable over decades of use. Thus, CSP with thermal energy storage (TES) leads to an efficient package in the supply of renewable energy and, at the same time, provides significant capacity, reliability and dispatchability to the electricity grid, allowing a further increase in the use of this technology in electricity generation through renewable source systems [3–5]. Molten salts have been applied as heat transfer fluid (HTF) in concentrated solar power (CSP) plants [6], reaching excellent results in conventional power generation plants. The use of molten salts such as HTF and thermal storage material at the same time has allowed the proper use in the adaptation of different typical components of a thermal plant as heat exchangers, so that their use makes the solar f
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