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Molten chloride salt technology for next-generation CSP plants: An economically competitive future scenario using Fe-based alloys with corrosion control

Gong, Qing and Ding, Wenjin and Bonk, Alexander and Bauer, Thomas (2022) Molten chloride salt technology for next-generation CSP plants: An economically competitive future scenario using Fe-based alloys with corrosion control. SolarPaces 2022, 2022-09-26 - 2022-09-30, Albuquerque, USA.

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Abstract

MgCl2-KCl-NaCl is one of the most promising chloride-salt mixtures for thermal energy storage (TES) in next-generation CSP plants with the advantages of low melting point (~383 °C), high thermal stability (stable at 800 °C), low vapor pressure (~ 1 kPa at 800 °C), and low cost (<0.35 USD/kg) [1]. With the chloride-TES and the advanced supercritical carbon dioxide (sCO2) Brayton power cycle, the next-generation (Gen3) concentrating solar power (CSP) plants could have a high thermal to electric efficiency of >50 % with >700 °C operating temperatures [2]. However, the high corrosivity of molten chloride salt to commercial Fe-Cr-Ni alloy results in the cost of chloride-TES using Ni-based alloys being several times higher than commercial nitrate-TES. It impedes the application of chloride-TES [2-5]. Our previous work showed that with the protection of corrosion inhibitor Mg. the corrosion of Fe-Cr-Ni can be significantly mitigated in molten chloride salt at 700 °C [6]. In this work, the possibility of using Fe-based alloys as the main structural materials for the hot and cold parts of the chloride-TES system is investigated.

Item URL in elib:https://elib.dlr.de/190730/
Document Type:Conference or Workshop Item (Speech)
Title:Molten chloride salt technology for next-generation CSP plants: An economically competitive future scenario using Fe-based alloys with corrosion control
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gong, QingUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ding, WenjinUNSPECIFIEDhttps://orcid.org/0000-0001-5037-5810UNSPECIFIED
Bonk, AlexanderUNSPECIFIEDhttps://orcid.org/0000-0002-0676-7267UNSPECIFIED
Bauer, ThomasUNSPECIFIEDhttps://orcid.org/0000-0003-4080-7944UNSPECIFIED
Date:2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal Energy Storage, Long Duration Energy Storage, TES, LDES, Molten Salt, High Temperature Corrosion
Event Title:SolarPaces 2022
Event Location:Albuquerque, USA
Event Type:international Conference
Event Start Date:26 September 2022
Event End Date:30 September 2022
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Storage
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bonk, Alexander
Deposited On:12 Dec 2022 18:23
Last Modified:11 Oct 2024 11:24

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