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Investigation of Regeneration Mechanisms of Aged Solar Salt

Steinbrecher, Julian and Bonk, Alexander and Sötz, Veronika Anna and Bauer, Thomas (2021) Investigation of Regeneration Mechanisms of Aged Solar Salt. Materials, 14 (5664). Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/ma14195664. ISSN 1996-1944.

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Official URL: https://www.mdpi.com/1996-1944/14/19/5664


The scope of our study was to examine the potential of regeneration mechanisms of an aged molten Solar Salt (nitrite, oxide impurity) by utilization of reactive gas species (nitrous gases, oxygen). Initially, aging of Solar Salt (60 wt% NaNO3, 40 wt% KNO3) was mimicked by supplementing the decomposition products, sodium nitrite and sodium peroxide, to the nitrate salt mixture. The impact of different reactive purge gas compositions on the regeneration of Solar Salt was elaborated. Purging the molten salt with a synthetic air (p(O2) = 0.2 atm) gas stream containing NO (200 ppm), the oxide ion concentration was effectively reduced. Increasing the oxygen partial pressure (p(O2) = 0.8 atm, 200 ppm NO) resulted in even lower oxide ion equilibrium concentrations. To our knowledge, this investigation is the first to present evidence of the regeneration of an oxide rich molten Solar Salt, and reveals the huge impact of reactive gases on Solar Salt reaction chemistry.

Item URL in elib:https://elib.dlr.de/145895/
Document Type:Article
Title:Investigation of Regeneration Mechanisms of Aged Solar Salt
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Steinbrecher, Julianjulian.steinbrecher (at) dlr.dehttps://orcid.org/0000-0003-1692-7487
Bonk, Alexanderalexander.bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Sötz, Veronika Annaveronika.soetz (at) th-deg.dehttps://orcid.org/0000-0002-8309-6612
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:29 September 2021
Journal or Publication Title:Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3390/ma14195664
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Advanced Materials for Thermal Energy Storage
Keywords:thermal energy storage; concentrating solar power (CSP); molten nitrate salt; thermal stability; liquid-gas reactions
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Storage
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Steinbrecher, Julian
Deposited On:08 Dec 2021 14:37
Last Modified:08 Dec 2021 14:37

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