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Engineering molten MgCl2–KCl–NaCl salt for high-temperature thermal energy storage: Review on salt properties and corrosion control strategies

Villada, Carolina und Ding, Wenjin und Bonk, Alexander und Bauer, Thomas (2021) Engineering molten MgCl2–KCl–NaCl salt for high-temperature thermal energy storage: Review on salt properties and corrosion control strategies. Solar Energy Materials and Solar Cells, 232 (111344). Elsevier. doi: 10.1016/j.solmat.2021.111344. ISSN 0927-0248.

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Kurzfassung

Conventional thermal energy storage (TES) media and heat transfer fluids (HTFs) currently used in commercial concentrated solar power (CSP) plants are nitrate-based molten salts with working temperature up to about 565°C. Current interest in raising the working temperature in next-generation CSP for higher energy conversion efficiency leads to chloride-based molten salt technology (>700°C). MgCl2-KCl-NaCl salt is selected to be such a TES/HTF material due to its excellent salt properties, abundance and low costs. In this review, survey and evaluation of its exact eutectic composition by evaluation of the phase diagram as well as most relevant salt properties for design, construction and operation of a test loop and projection of a real TES/HTF system are presented. They include minimum melting temperature, vapor pressure, heat capacity, density, thermal conductivity and dynamic viscosity. The working temperature range 420-800°C is suggested for the TES/HTF system using this salt. Moreover, the recommended values of the heat capacity, density, thermal conductivity and dynamic viscosity in the suggested working temperature range are given. In addition, corrosion control strategies for this salt including corrosion monitoring and mitigation techniques are briefly reviewed, since controlling the salt corrosivity is one main concern of the engineering aspects using the molten chlorides at high temperatures. Overall, this review is expected to supply reliable values of the most relevant salt properties and recommend the most promising corrosion control strategies for further material studies, as well as modeling, simulation, detailed design and construction of molten MgCl2–KCl–NaCl salt TES/HTF systems.

elib-URL des Eintrags:https://elib.dlr.de/145226/
Dokumentart:Zeitschriftenbeitrag
Titel:Engineering molten MgCl2–KCl–NaCl salt for high-temperature thermal energy storage: Review on salt properties and corrosion control strategies
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Villada, CarolinaInstitute of Engineering ThermodynamicsNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ding, WenjinWenjin.Ding (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bonk, AlexanderAlexander.Bonk (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bauer, ThomasThomas.Bauer (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:August 2021
Erschienen in:Solar Energy Materials and Solar Cells
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:232
DOI:10.1016/j.solmat.2021.111344
Verlag:Elsevier
ISSN:0927-0248
Status:veröffentlicht
Stichwörter:Concentrated solar power (CSP); Thermal energy storage (TES); Heat transfer fluid (HTF); Molten chloride salts; Thermophysical and physicochemical property; Corrosion monitoring and mitigation.
HGF - Forschungsbereich:Energie
HGF - Programm:Materialien und Technologien für die Energiewende
HGF - Programmthema:Thermische Hochtemperaturtechnologien
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Thermochemische Prozesse
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Ding, Wenjin
Hinterlegt am:08 Dez 2021 14:36
Letzte Änderung:01 Feb 2024 03:00

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