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Solar Salt - Pushing an old material for energy storage to a new limit

Bonk, Alexander and Braun, Markus and Sötz, Veronika and Bauer, Thomas (2020) Solar Salt - Pushing an old material for energy storage to a new limit. Applied Energy, 262 (114535). Elsevier. DOI: 10.1016/j.apenergy.2020.114535 ISSN 0306-2619

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0306261920300477?via%3Dihub


The implementation of inexpensive and reliable energy storage technologies is crucial for the decarbonisation of energy intensive industry branches and energy supply. Sensible thermal energy storage (TES) in molten salts is a key technology for storage of heat in the scale of gigawatt hours but currently limited to operating temperatures of 560°C. Increasing the maximum operating temperature while maintaining thermal stability of the storage medium is one of the main challenges next-Generation TES systems are facing. Extending the upper temperature limit by only 40 °C increases the storage capacity by more than 16 % allowing for more compact storage designs and cost savings in the $ million-range for large scale storage units. Here we propose a novel storage technology from a materials point of view that pushes the thermal stability limit of Solar Salt up to 600 °C by simply but effectively sealing the storage unit including the gas system. The concentration of the unstable nitrite ion and of the corrosive oxide ion could be reduced by 16 % and 75 %, respectively at 600 °C, compared to a salt system with open atmosphere. We present clear evidence of the enhanced thermal stability in long-term, 100 g-scale test campaigns at previously unequalled temperatures. These findings constitute a major advance in the design and engineering of next generation storage systems.

Item URL in elib:https://elib.dlr.de/133821/
Document Type:Article
Title:Solar Salt - Pushing an old material for energy storage to a new limit
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bonk, AlexanderAlexander.Bonk (at) dlr.deUNSPECIFIED
Braun, Markusmar.braun (at) dlr.deUNSPECIFIED
Sötz, VeronikaVeronika.Soetz (at) dlr.dehttps://orcid.org/0000-0002-8309-6612
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Date:January 2020
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.apenergy.2020.114535
Keywords:Thermal Energy Storage, Molten Nitrate Salt, Enhancing Thermal Stability, Solar Salt
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)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bonk, Alexander
Deposited On:23 Jan 2020 14:18
Last Modified:23 Jan 2020 14:18

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