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Review of the solubility, monitoring, and purification of impurities in molten salts for energy storage in concentrated solar power plants

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  • Ong, Teng-Cheong
  • Sarvghad, Madjid
  • Lippiatt, Kaleb
  • Griggs, Lewis
  • Ryan, Hollie
  • Will, Geoffrey
  • Steinberg, Theodore A.

Abstract

Thermal Energy Storage (TES) for Concentrated Solar Power (CSP) applications is a vital part of bringing green technologies to cost parity with traditional fuel-based power. Eutectic salt mixtures are highly suitable for use in TES. However, they contain impurities that can detrimentally impact their performance and corrosion characteristics when stored in a metallic container. This review will present a summary of findings that delve into the characterization, quantification, and, most importantly, the mitigation and control of these contaminants. Some of the common impurities discovered in commercially available salts include O2, H+ and OH−, all of which highly accelerate corrosion. Other contaminants include chloride, fluoride, perchlorate, sulfate, carbonate and nitrite/nitrate compounds. Purification, monitoring, and control of impurities are presented; including heat processing, gas sparging, additives, acid consumption analysis, voltammetry methods, and physical filtration. Finally, recommendations are made for the most appropriate strategies for mitigating impurities for CSP applications.

Suggested Citation

  • Ong, Teng-Cheong & Sarvghad, Madjid & Lippiatt, Kaleb & Griggs, Lewis & Ryan, Hollie & Will, Geoffrey & Steinberg, Theodore A., 2020. "Review of the solubility, monitoring, and purification of impurities in molten salts for energy storage in concentrated solar power plants," Renewable and Sustainable Energy Reviews, Elsevier, vol. 131(C).
    • Handle: RePEc:eee:rensus:v:131:y:2020:i:c:s1364032120302975
    DOI: 10.1016/j.rser.2020.110006
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    References listed on IDEAS

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    Cited by:

    1. Yu, Qiang & Zhang, Cancan & Lu, Yuanwei & Kong, Qinglong & Wei, Haijiao & Yang, Yanchun & Gao, Qi & Wu, Yuting & Sciacovelli, Adriano, 2021. "Comprehensive performance of composite phase change materials based on eutectic chloride with SiO2 nanoparticles and expanded graphite for thermal energy storage system," Renewable Energy, Elsevier, vol. 172(C), pages 1120-1132.
    2. Huang, Zizhou & Li, Qing & Qiu, Yu, 2024. "Enhancements in thermal properties of binary alkali chloride salt by Al2O3 nanoparticles for thermal energy storage," Energy, Elsevier, vol. 301(C).

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