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An inexpensive storage material for molten salt based thermocline concepts: Stability of AlferRock in solar salt

Bonk, Alexander and Knoblauch, Nicole and Braun, Markus and Bauer, Thomas and Schmücker, Martin (2020) An inexpensive storage material for molten salt based thermocline concepts: Stability of AlferRock in solar salt. Solar Energy Materials and Solar Cells, 212 (110578). Elsevier. doi: 10.1016/j.solmat.2020.110578. ISSN 0927-0248.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0927024820301811?via%3Dihub


The implementation of inexpensive scalable thermal energy storage will play a crucial role in the successful establishment of dispatchable renewable energy technologies. Storage based on molten nitrate salts is one of the most relevant technologies implemented in the GWh-scale. Yet, there is significant cost reduction potential in replacing the conventional two-tank system by a single-tank thermocline system. The latter involve the use of a single-tank design where a large fraction of the costly salt is replaced by an inexpensive filler material. Industrial waste materials such as AlferRock (red-mud-derived Fe2O3-rich ceramics), have significant potential since they are readily available in the Mt-range and have adequate thermal and mechanical resistance at the intended temperature of use. This study explicitly investigates the corrosion resistance of AlferRock in Solar Salt, 60% NaNO3-40% KNO3 mixture, at 560 °C. By variation of particle sizes classical exposure tests as well as accelerated test methods can be applied to understand the long-term stability of this waste material under relevant conditions. Salt chemistry and compositional changes in the filler are analyzed in terms of ion chromatrography, titration, diffraction techniques (XRD) as well as electron microscopy (SEM) coupled with element mapping (EDX).

Item URL in elib:https://elib.dlr.de/135019/
Document Type:Article
Title:An inexpensive storage material for molten salt based thermocline concepts: Stability of AlferRock in solar salt
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Knoblauch, NicoleNicole.Knoblauch (at) dlr.deUNSPECIFIED
Braun, Markusmar.braun (at) dlr.deUNSPECIFIED
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Schmücker, MartinMartin.Schmuecker (at) dlr.deUNSPECIFIED
Journal or Publication Title:Solar Energy Materials and Solar Cells
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.solmat.2020.110578
Keywords:thermal stability, molten salt, thermal energy storage (TES), concentrating solar power (CSP), heat transfer fluids (HTF)
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Institute of Materials Research
Deposited By: Bonk, Alexander
Deposited On:20 May 2020 13:45
Last Modified:20 May 2020 13:45

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