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Potential of Corundum and Metallurgical slags as filler materials for a molten-salt based thermocline storage concept

Knoblauch, Nicole and Bonk, Alexander and Alkan, Gözde and Mechnich, Peter (2023) Potential of Corundum and Metallurgical slags as filler materials for a molten-salt based thermocline storage concept. SolarPACES, Sydney.

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Abstract

Solar thermal power plants with integrated thermal storage are promising for renewable energy production concepts. A recent idea of cost reductions in the thermocline storage by replacing a significant amount of Solar Salt by a low-cost filler material [e.g.1-2] is further investigated. The filler materials have to be resistant in molten salt at temperatures up to 560 °C. In this study degradation studies on corundum and metallurgical slag (copper recycling) in molten NaNO3/KNO3 salt are carried out. The work addresses changes of mechanical/ chemical properties and microstructure of the filler depending on the exposure time in molten salt at 560 °C. After exposure the remaining Vickers hardness is determined and the change of chemical composition and morphology is investigated using XRD, SEM and EDS. The analysis shows that corundum forms a passivation layer as sodium aluminate after prolonged ageing in solar salt. Changes in the chemical composition of the metallurgical slag stored in solar salt are mainly determined by silicate rich phases it contains. However, the structure and stability of the slag remains. Additionally, the specific heat capacity of metallurgical slag depending on the temperature is determined by calorimetry. The results are essential to verify the suitability of corundum and slag as potential filler materials in modern thermocline storage concepts or other heat storage systems.

Item URL in elib:https://elib.dlr.de/198400/
Document Type:Conference or Workshop Item (Poster)
Title:Potential of Corundum and Metallurgical slags as filler materials for a molten-salt based thermocline storage concept
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Knoblauch, NicoleUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonk, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alkan, GözdeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mechnich, PeterUNSPECIFIEDhttps://orcid.org/0000-0003-4689-8197145419780
Date:11 October 2023
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermal storage, molten salt, slag
Event Title:SolarPACES
Event Location:Sydney
Event Type:international Conference
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 SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional ceramics
Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Knoblauch, Nicole
Deposited On:27 Oct 2023 14:49
Last Modified:27 Oct 2023 14:49

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