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

Vidal, Judith C; Klammer, Noah

doi:10.1063/1.5117601

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

Conference · Fri Jul 26 04:00:00 EDT 2019

DOI:https://doi.org/10.1063/1.5117601· OSTI ID:1559774

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National Renewable Energy Laboratory (NREL), Golden, CO (United States)

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.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 1559774

Report Number(s):: NREL/CP-5500-74710

Country of Publication:: United States

Language:: English

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