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Internal insulation and corrosion control of molten chloride thermal energy storage tanks

Gage, SH; Bailey, JJ; Finegan, DP; Brett, DJL; Shearing, PR; Turchi, CS; (2021) Internal insulation and corrosion control of molten chloride thermal energy storage tanks. Solar Energy Materials and Solar Cells , 225 , Article 111048. 10.1016/j.solmat.2021.111048. (In press). Green open access

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Abstract

A chloride-based molten-salt system that uses a ternary blend of MgCl2/KCl/NaCl is investigated to provide higher-temperature thermal energy storage capability than conventional nitrate salt-based systems. Despite their high thermal stability and operating temperature, molten chlorides present several challenges, including the design of internal liners to prevent the corrosion and thermal stress of alloy tank shells. This work discusses issues and potential solutions related to containment of molten chloride salt, specifically the optimization of the hot face refractory materials for use as internal liners. Three down-selected refractory materials were analyzed with respect to permeation of salt through the material as well as chemical stability during high temperature operation. Through the application of X-ray imaging and electron spectroscopy techniques, highly stable secondary surface phases in equilibrium with the molten salt were identified, as well as time-dependent changes in the salt composition itself.

Type: Article
Title: Internal insulation and corrosion control of molten chloride thermal energy storage tanks
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.solmat.2021.111048
Publisher version: http://dx.doi.org/10.1016/j.solmat.2021.111048
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Gen3 CSP, Molten chloride salt, Thermal energy storage, Refractory ceramics, Corrosion science, Surface passivation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10128790
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