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Experimental Investigation of Chloride Molten Salts for Thermal Energy Storage Applications

Maksoud, Louis and Bauer, Thomas (2015) Experimental Investigation of Chloride Molten Salts for Thermal Energy Storage Applications. 10th International Conference on Molten Salt Chemistry and Technology, 10.-12. Juni 2015, Shenyang, China.

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Official URL: http://conf.neu.edu.cn/ms10/

Abstract

Due to their physicochemical and thermal properties, molten halide salt mixtures are potential liquids to be used for sensible thermal energy storage (TES) in Concentrating Solar Power (CSP) plants. Their high thermal stability makes them appropriate candidates to replace the currently used nitrate salts (stable up to 560 °C) when higher operating temperatures are required (up to 700 °C). However, the application of molten halides in CSP causes additional challenges such as increased corrosiveness. In the present work, we focus on the molten salts purity, because it has a direct influence on the corrosion rate of metals. Some halide salts are hygroscopic and heating in presence of water induces hydrolysis of the salt and formation of oxides/hydroxides compounds. First tests using simple heating procedures showed unacceptable salt decomposition and corrosion rates. An advanced process technology and purification approach has been developed yielding improved salt quality and thus reduced corrosion rates. In this paper the optimized process technology for the dehydration of the salt and simultaneously investigation of the corrosion rate depending on the salt impurities is presented. This is an important step for a better utilization of molten halides as liquid media for solar and other application requiring molten salt operation in contact with structural metallic components.

Item URL in elib:https://elib.dlr.de/96675/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental Investigation of Chloride Molten Salts for Thermal Energy Storage Applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Maksoud, Louislouis.maksoud (at) dlr.deUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.deUNSPECIFIED
Date:June 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Molten salts, halides, TES, CSP, purity, corrosion, process technology, solar energy
Event Title:10th International Conference on Molten Salt Chemistry and Technology
Event Location:Shenyang, China
Event Type:international Conference
Event Dates:10.-12. Juni 2015
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemical Processes (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bauer, Dr.phil. Thomas
Deposited On:28 Jul 2015 11:22
Last Modified:28 Jul 2015 11:22

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