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

RENEWABLE & SUSTAINABLE ENERGY REVIEWS

卷:131

Review

Ong, Teng-Cheong¹  Sarvghad, Madjid¹  Lippiatt, Kaleb¹  Griggs, Lewis¹  Ryan, Hollie¹  Will, Geoffrey¹  Steinberg, Theodore A.¹ 

[1] Queensland Univ Technol, 2 George St, Brisbane, Qld 4000, Australia

关键词: Thermal energy storage;    Molten salt;    Impurity;    Monitoring;    Purification;   

DOI  :  10.1016/j.rser.2020.110006

来源: Elsevier

【 摘 要 】

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 O-2, 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.

【 授权许可】

Free