Molten Chloride Technology Pathway to Meet the U.S. DOE SunShot Initiative with Gen3 CSP: Paper No. 080006

Judith Vidal, Noah Klammer

Research output: Contribution to conferencePaper

37 Scopus Citations

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.
Original languageAmerican English
Number of pages9
DOIs
StatePublished - 2019
EventSolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems - Casablanca, Morocco
Duration: 2 Oct 20185 Oct 2018

Conference

ConferenceSolarPACES 2018: International Conference on Concentrating Solar Power and Chemical Energy Systems
CityCasablanca, Morocco
Period2/10/185/10/18

NREL Publication Number

  • NREL/CP-5500-74710

Keywords

  • associated liquids
  • concentrated solar power
  • differential scanning calorimetry
  • materials properties
  • thermal instruments

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