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Geometric Optimization of an Electrochemical Purification Cell to Prevent Corrosion in CSP Plants During Operation

Conference ·
DOI:https://doi.org/10.1063/5.0169822· OSTI ID:2205505
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When exposed to moisture or oxygen, molten chloride salts produce corrosive impurities which degrade containment alloys. This can significantly decrease the lifetime and increase costs of molten-salt-based systems. To overcome this barrier, we designed and modeled an electrochemical purification cell to remove the corrosive impurity MgOH+. Various reactor architectures, including continuous stirred tank reactors (CSTRs) and plug flow reactors (PFRs) were investigated. Steady-state thermoelectric properties were evaluated using analytical methods, allowing assessment of the effects of structure and design parameters such as flow rate, cell length, and cross-sectional area of molten salt. The results suggest that our design could most effectively increase reliability and decrease costs of molten-chloride-salt-based systems by protecting them during continuous operation using an annular plug flow reactor.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; Mines/NREL Advanced Energy Systems Graduate Program; USDOE Office of Science (SC), Office of Workforce Development for Teachers and Scientists (WDTS), Science Undergraduate Laboratory Internships (SULI) Program
DOE Contract Number:
AC36-08GO28308
OSTI ID:
2205505
Report Number(s):
NREL/CP-5500-88032; MainId:88807; UUID:ccb5181e-969d-4933-b087-9803a21c861f; MainAdminID:71038
Resource Relation:
Conference: Presented at SolarPACES: 27th International Conference on Concentrating Solar Power and Chemical Energy Systems, 27 September - 1 October 2021; Related Information: 80088
Country of Publication:
United States
Language:
English

References (8)

Corrosion of alloys in a chloride molten salt (NaCl-LiCl) for solar thermal technologies December 2016
Molten chloride salts for next generation concentrated solar power plants: Mitigation strategies against corrosion of structural materials May 2019
Cyclic Voltammetry for Monitoring Corrosive Impurities in Molten Chlorides for Thermal Energy Storage October 2017
Concentrating Solar Power Gen3 Demonstration Roadmap January 2017
Molten chloride salts for next generation CSP plants: Electrolytical salt purification for reducing corrosive impurity level September 2019
Turbulent mass transfer rates to a wall for large Schmidt numbers January 1977
Diffusion-Controlled Electrode Reactions September 1951
Multielectrode array sensors to enable long-duration corrosion monitoring and control of concentrating solar power systems March 2021

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Related Subjects

SOLAR ENERGY
analytical modeling
corrosion
CSP
electrochemical purification
molten chloride salts