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Molten Chloride Salts for Thermal Energy Storage in Next Generation CSP: Acceptable Salt Impurity Level for Metallic Corrosion Control

Gong, Qing and Ding, Wenjin and Chai, Yan and Bonk, Alexander and Bauer, Thomas (2020) Molten Chloride Salts for Thermal Energy Storage in Next Generation CSP: Acceptable Salt Impurity Level for Metallic Corrosion Control. In: SolarPACES 2020. SolarPACES 2020, 28. Sept. - 02. Okt. 2020, Virtual Meeting.

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Abstract

In this work, an advanced titration process based on the developed acid consumption titration method in previous work is investigated and used for chemical post-analysis of the MgOHCl concentration in the MgCl2-containing molten chlorides. Compared to the existing titration methods in, this advanced titration process can avoid the negative effect of dissolved MgO in the molten salt on the measurement accuracy. Both the measurement limit and accuracy are improved to the ppm level - the target concentration level regarding the salt corrosivity. Furthermore, the electrochemical method based on cyclic voltammetry for in-situ monitoring MgOHCl concentration developed previously is calibrated using this advanced titration process to improve its measurement accuracy and precision. Both methods for impurity concentration measurements as well as the methods for corrosion rate measurements will be used to investigate the acceptable impurity levels for selected low-cost structural materials such as high-temperature stainless steels for e.g. molten salt storage tanks in TES applications.

Item URL in elib:https://elib.dlr.de/136813/
Document Type:Conference or Workshop Item (Poster)
Title:Molten Chloride Salts for Thermal Energy Storage in Next Generation CSP: Acceptable Salt Impurity Level for Metallic Corrosion Control
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gong, QingQing.Gong (at) dlr.deUNSPECIFIED
Ding, WenjinWenjin.Ding (at) dlr.deUNSPECIFIED
Chai, YanYan.Chai (at) dlr.deUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.deUNSPECIFIED
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Date:28 September 2020
Journal or Publication Title:SolarPACES 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CSP, TES, molten chlorides, corrosion control system
Event Title:SolarPACES 2020
Event Location:Virtual Meeting
Event Type:international Conference
Event Dates:28. Sept. - 02. Okt. 2020
Organizer:US. Department of Energy
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Ding, Wenjin
Deposited On:23 Oct 2020 11:30
Last Modified:23 Oct 2020 11:30

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