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High-temperature stability of nitrate/nitrite molten salt mixtures under different atmospheres

Villada Vargas, Carolina and Bonk, Alexander and Bauer, Thomas and Bolívar, Francisco (2018) High-temperature stability of nitrate/nitrite molten salt mixtures under different atmospheres. Applied Energy, 226. Elsevier. DOI: 10.1016/j.apenergy.2018.05.101 ISSN 0306-2619

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Abstract

Molten salts are widely used as thermal energy storage media in the Concentrating Solar Power (CSP) technologies. The melting point and the thermal stability of the salt determine the applicable temperature range of the storage system. The focus of this paper is to evaluate the effect of different gas atmospheres on the thermal stability of binary Solar Salt and two ternary salt mixtures containing lithium nitrate (Lithium mixture) and sodium nitrite (Hitec). The isothermal stability experiments were carried out at 550 °C during 500 h and the results show that the initial decomposition reaction of nitrate to nitrite depends strongly on the gas atmosphere. It is observed that changes in the nitrate-nitrite-ratio are the key parameters influencing the melting temperatures of the salt mixtures. For example, for experiments with oxygen in the atmosphere a large increase of the liquidus temperature of the Hitec mixture was observed. Metal oxides are formed during the irreversible decomposition of nitrite-ions but are found to affect the solidus and liquidus temperature of the salt mixtures only marginally. No carbonate formation was detected according to titration analysis of the salt mixtures in our experiments due to the absence of carbon dioxide in the atmosphere.

Item URL in elib:https://elib.dlr.de/124668/
Document Type:Article
Title:High-temperature stability of nitrate/nitrite molten salt mixtures under different atmospheres
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Villada Vargas, Carolinacarolina.villadavargas (at) dlr.deUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Bolívar, FranciscoUNSPECIFIEDUNSPECIFIED
Date:23 May 2018
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:226
DOI :10.1016/j.apenergy.2018.05.101
Publisher:Elsevier
ISSN:0306-2619
Status:Published
Keywords:Thermal energy storage (TES) Concentrating solar power (CSP) Heat transfer fluid Nitrite formation Oxide formation Thermal decomposition
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: Köln-Porz
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bauer, Dr.phil. Thomas
Deposited On:20 Dec 2018 14:27
Last Modified:06 Sep 2019 15:21

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