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Molten chloride salts for next generation CSP plants: Electrolytical salt purification for reducing corrosive impurity level

Ding, Wenjin and Gomez-Vidal, Judith and Bonk, Alexander and Bauer, Thomas (2019) Molten chloride salts for next generation CSP plants: Electrolytical salt purification for reducing corrosive impurity level. Solar Energy Materials and Solar Cells, 199, pp. 8-15. Elsevier. DOI: 10.1016/j.solmat.2019.04.021 ISSN 0927-0248

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Official URL: https://www.sciencedirect.com/science/article/pii/S0927024819302065?via%3Dihub

Abstract

In this work, electrolysis with a Mg anode is presented to purify the molten chloride salt (MgCl2/KCl/NaCl 60/20/20 mol.%) for reducing its corrosivity. Using a Mg anode, the production of toxic gases like Cl2 on an inert anode (e.g., tungsten) can be avoided. Moreover, compared to an inert anode, a lower over-potential is required to remove the corrosive impurity MgOH+ in the molten salt due to the high reactivity of Mg. In order to evaluate the effect of the salt purification, the cyclic voltammetry (CV) method developed in our previous work is used to in-situ measure the concentration of the corrosive MgOH+ impurity in the molten salt. The CV measurements indicate that the corrosive impurity is efficiently removed by electrolysis. For decreasing the cathode inactivation due to produced MgO on the surface, a pulsed potential applied on the tungsten cathode during electrolysis shows to be promising. This electrochemical salt purification method has shown to be promising by efficiently controlling the corrosivity of the molten chloride salt. The potentiodynamic polarization (PDP) measurements on a commercial high-temperature alloy (Incoloy 800 H) immersed in the molten salt indicate that the corrosion rate of the alloy is significantly reduced due to the salt purification. It could also lead to a reduction of the cost of the conventional salt purification step, structural container materials, and piping in next generation concentrated solar power (Gen3 CSP) plants.

Item URL in elib:https://elib.dlr.de/127373/
Document Type:Article
Title:Molten chloride salts for next generation CSP plants: Electrolytical salt purification for reducing corrosive impurity level
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ding, WenjinWenjin.Ding (at) dlr.dehttps://orcid.org/0000-0001-5037-5810
Gomez-Vidal, JudithJudith.Vidal (at) nrel.govUNSPECIFIED
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Bauer, ThomasThomas.Bauer (at) dlr.deUNSPECIFIED
Date:17 April 2019
Journal or Publication Title:Solar Energy Materials and Solar Cells
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:199
DOI :10.1016/j.solmat.2019.04.021
Page Range:pp. 8-15
Publisher:Elsevier
ISSN:0927-0248
Status:Published
Keywords:Concentrated solar power (CSP); Corrosion control; Corrosive impurity; Cyclic voltammetry (CV); Electrolysis; Potentiodynamic polarization (PDP).
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:12 Jul 2019 10:50
Last Modified:12 Jul 2019 10:50

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