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Title: Molten Chloride Technology Pathway to Meet the U.S. DOE SunShot Initiative with Gen3 CSP

Abstract

Third-generation (Gen3) concentrating solar power (CSP) technologies require a thermally stable and inexpensive fluid to be used for heat transfer and thermal energy storage. For Gen3 CSP plants, a molten salt composed of MgCl2 - KCl - NaCl is a new candidate, but it is familiar enough to plants with existing molten-salt systems. To determine the best composition for the heat-transfer fluid, we mixed nine different ratios of the salts, dry/purified them following strict protocols, and tested them with a differential scanning calorimeter and a thermogravimetric analyzer. Our results showed that the lowest melting and solidification temperature of 385 degrees C +/- 1 degrees C was determined for the eutectic composition 44.7 MgCl2 - 25.8 KCl - 29.4 NaCl (mol.%). We determined that improper handling and preparation of the salt mixture highly affects its thermal properties because of moisture absorption. Preparation standards - particularly the dehydration of hydrous MgCl2 - merit further development.

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1559774
Report Number(s):
NREL/CP-5500-74710
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at SolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems, 2-5 October 2018, Casablanca, Morocco
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; associated liquids; materials properties; concentrated solar power; differential scanning calorimetry; thermal instruments

Citation Formats

Vidal, Judith C, and Klammer, Noah. Molten Chloride Technology Pathway to Meet the U.S. DOE SunShot Initiative with Gen3 CSP. United States: N. p., 2019. Web. doi:10.1063/1.5117601.
Vidal, Judith C, & Klammer, Noah. Molten Chloride Technology Pathway to Meet the U.S. DOE SunShot Initiative with Gen3 CSP. United States. doi:10.1063/1.5117601.
Vidal, Judith C, and Klammer, Noah. Fri . "Molten Chloride Technology Pathway to Meet the U.S. DOE SunShot Initiative with Gen3 CSP". United States. doi:10.1063/1.5117601.
@article{osti_1559774,
title = {Molten Chloride Technology Pathway to Meet the U.S. DOE SunShot Initiative with Gen3 CSP},
author = {Vidal, Judith C and Klammer, Noah},
abstractNote = {Third-generation (Gen3) concentrating solar power (CSP) technologies require a thermally stable and inexpensive fluid to be used for heat transfer and thermal energy storage. For Gen3 CSP plants, a molten salt composed of MgCl2 - KCl - NaCl is a new candidate, but it is familiar enough to plants with existing molten-salt systems. To determine the best composition for the heat-transfer fluid, we mixed nine different ratios of the salts, dry/purified them following strict protocols, and tested them with a differential scanning calorimeter and a thermogravimetric analyzer. Our results showed that the lowest melting and solidification temperature of 385 degrees C +/- 1 degrees C was determined for the eutectic composition 44.7 MgCl2 - 25.8 KCl - 29.4 NaCl (mol.%). We determined that improper handling and preparation of the salt mixture highly affects its thermal properties because of moisture absorption. Preparation standards - particularly the dehydration of hydrous MgCl2 - merit further development.},
doi = {10.1063/1.5117601},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}

Conference:
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