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Simulation-Assisted Determination of the Minimum Melting Temperature Composition of MgCl2–KCl–NaCl Salt Mixture for Next-Generation Molten Salt Thermal Energy Storage

Villada Vargas, Carolina and Ding, Wenjin and Bonk, Alexander and Bauer, Thomas (2022) Simulation-Assisted Determination of the Minimum Melting Temperature Composition of MgCl2–KCl–NaCl Salt Mixture for Next-Generation Molten Salt Thermal Energy Storage. Frontiers in Energy Research, 10 (809663). Frontiers Media S.A.. doi: 10.3389/fenrg.2022.809663. ISSN 2296-598X.

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Official URL: https://www.frontiersin.org/articles/10.3389/fenrg.2022.809663/full

Abstract

Molten chloride mixtures such as MgCl2–KCl–NaCl are potential thermal energy storage (TES) materials and heat transfer fluids (HTFs) for next-generation concentrating solar power (CSP) systems due to their high operation temperatures (>700°C) and low costs. This ternary MgCl2–KCl–NaCl salt mixture with a low material cost (<0.35 $/kg) is a promising salt for high-temperature TES/HTF applications, for example, it could enable next-generation CSP plants to have significant power cycle efficiency and lower levelized cost of electricity (LCOE). In this study, the minimum melting temperature composition for the MgCl2–KCl–NaCl mixture was estimated by FactSage simulation, while the binary and ternary phase diagrams of the MgCl2–KCl–NaCl salt system, including their phase transitions, were studied. Five different eutectic compositions of the MgCl2–KCl–NaCl mixture from literature and simulations were selected to determine the minimum melting temperature composition by the differential scanning calorimetry technique. Results show agreement between experiments and simulations of the melting temperature and its composition. Hence, values of the exact and reliable minimum melting temperature and salt composition in mol% and wt% are given. Based on the determined melting temperature, the minimum operating temperature of MgCl2–KCl–NaCl is recommended according to the safety margin for CSP applications.

Item URL in elib:https://elib.dlr.de/185520/
Document Type:Article
Title:Simulation-Assisted Determination of the Minimum Melting Temperature Composition of MgCl2–KCl–NaCl Salt Mixture for Next-Generation Molten Salt Thermal Energy Storage
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Villada Vargas, Carolinacarolina.villadavargas (at) dlr.deUNSPECIFIED
Ding, WenjinWenjin.Ding (at) dlr.deUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.deUNSPECIFIED
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Date:4 March 2022
Journal or Publication Title:Frontiers in Energy Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:10
DOI :10.3389/fenrg.2022.809663
Publisher:Frontiers Media S.A.
ISSN:2296-598X
Status:Published
Keywords:concentrating solar power; eutectic composition; heat transfer fluid; thermal energy storage; phase diagram
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for High-Temperature Thermal Technologies, E - Advanced Heat Transfer Media, E - Thermochemical Processes
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Ding, Wenjin
Deposited On:14 Mar 2022 18:46
Last Modified:24 May 2022 23:48

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