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Molten chloride salt technology for next-generation CSP plants: Selection of cold tank structural material utilizing corrosion control at 500 ◦C

Gong, Qing and Hanke, Andrea and Kessel, Fiona and Bonk, Alexander and Bauer, Thomas and Ding, Wenjin (2023) Molten chloride salt technology for next-generation CSP plants: Selection of cold tank structural material utilizing corrosion control at 500 ◦C. Solar Energy Materials and Solar Cells, 253 (112233). Elsevier. doi: 10.1016/j.solmat.2023.112233. ISSN 0927-0248.

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Abstract

MgCl2-KCl-NaCl molten chloride salt is a promising candidate for thermal energy storage medium and heat transfer fluid for next-generation Concentrating Solar Power (CSP) plants (Gen-3 CSP). The main challenge has yet been the selection of economical yet corrosion-resistant structural materials to be used. Previous work by the authors has demonstrated that simple corrosion control strategies can mitigate corrosion effects, thereby allowing the use of classical stainless steels as structural materials in the hot part (e.g., ≥700 ◦C) of the CSP system. This study addresses the selection of cold tank materials, which have to withstand corrosion effects up to temperatures of 500 ◦C. Two cost-effective commercial types of steels, P91 and SS 304, were examined as candidates for structural materials, and controlled corrosion experiments were performed in molten MgCl2-KClNaCl salt at 500 ◦C for 1400 h. Before the exposure tests, the chloride salt was purified using a simple yet effective Mg-doping technique. The results show that the corrosion rates (CRs) of P91 samples are consistently low (<15 μm/year) for both macroscopic and microscopic analysis. The cheaper P91 steel outperforms the more expensive SS 304 in terms of corrosion resistance and also may prove to be beneficial in terms of mechanical properties and economics. Overall, the use of P91 as a cold tank structural material allows for significant cost reduction of the cold tank for chloride-TES system and enhances its competitiveness compared with commercial nitrate-TES.

Item URL in elib:https://elib.dlr.de/194073/
Document Type:Article
Title:Molten chloride salt technology for next-generation CSP plants: Selection of cold tank structural material utilizing corrosion control at 500 ◦C
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gong, QingUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hanke, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kessel, FionaUNSPECIFIEDhttps://orcid.org/0000-0001-9417-7162UNSPECIFIED
Bonk, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bauer, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ding, WenjinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:February 2023
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:253
DOI:10.1016/j.solmat.2023.112233
Publisher:Elsevier
ISSN:0927-0248
Status:Published
Keywords:Concentrating solar power (CSP); Thermal energy storage (TES); Molten chloride salt; Corrosion mitigation; Material selection of cold tank
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for High-Temperature Thermal Technologies, E - Advanced Heat Transfer Media
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Institute of Structures and Design > Ceramic Composite Structures
Deposited By: Ding, Wenjin
Deposited On:28 Feb 2023 09:37
Last Modified:28 Feb 2023 09:37

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