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Enhancing the Thermal Stability of Solar Salt up to 600°C in Extended Lab-Scale Experiments

Bonk, Alexander and Braun, Markus and Hanke, Andrea and Sötz, Veronika and Bauer, Thomas (2019) Enhancing the Thermal Stability of Solar Salt up to 600°C in Extended Lab-Scale Experiments. Energy Procedia. Elsevier. doi: 10.1063/5.0029151. ISSN 1876-6102.

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Future trends push TES towards higher temperatures to increase solar-to-electricity conversion efficiency and novel storage materials are often considered the only viable option. To date these candidates suffer from either high costs (carbonate salts containing Li+) or severely attack structural materials (chloride salts) and are far from industrial implementation. An alternative approach is investigated in our work - the use of the classical Solar Salt with sophisticated gas management which selectively shifts the chemical equilibrium to the stable nitrate-side of the decomposition reaction. We demonstrate that the thermal stability of conventional Solar Salt (60-40wt % NaNO3-KNO3) is substantially increased when the storage system including the gas system is simply but effectively sealed. The key to this novel data is the unique feature of in-situ sample extraction and post-analysis that allows for a quasi in-situ determination of molten salt stability in terms of nitrite and oxide ion formation. Our investigations present clear evidence on the enhanced thermal stability at an experimental scale of about 100 g that is two magnitudes larger than conventional thermal analysis experiments.

Item URL in elib:https://elib.dlr.de/132337/
Document Type:Article
Title:Enhancing the Thermal Stability of Solar Salt up to 600°C in Extended Lab-Scale Experiments
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Braun, Markusmar.braun (at) dlr.deUNSPECIFIED
Hanke, AndreaAndrea.Hanke (at) dlr.dehttps://orcid.org/0000-0002-4137-7985
Sötz, VeronikaVeronika.Soetz (at) dlr.dehttps://orcid.org/0000-0002-8309-6612
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Journal or Publication Title:Energy Procedia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1063/5.0029151
Keywords:Thermal Energy Storage, Molten Nitrate Salt, Thermal Stability, Maximum Temperature Enhancement,
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
Deposited By: Bonk, Alexander
Deposited On:19 Dec 2019 15:44
Last Modified:13 May 2022 13:03

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