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Concentrated Solar Tower Power Plant using Slag as Inventory Material for a Thermal Energy Storage (TES)

Krüger, Michael and Haunstetter, Jürgen and Zunft, Stefan (2018) Concentrated Solar Tower Power Plant using Slag as Inventory Material for a Thermal Energy Storage (TES). 12th International Renewable Energy Storage (IRES 2018), 13.-15. Mrz. 2018, Düsseldorf.

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Concentrating solar tower power systems using air as a heat transfer fluid (HTF) have a promising potential for a high solar-to-electric efficiency due to the high conversion temperature. For a successful market introduction, efficient, cost-effective and up-scalable solutions for the thermal energy storage (TES), a central plant component, are a prerequisite. Regenerator-type storages based on solid heat storage media are well suited to the needs. Here, slag pebbles from steel industry as an inventory material offers cost reduction potentials. However, further investigations are needed to clarify open questions concerning the implementation in large installations in combination with slag pebbles as inventory. The European project RESLAG is dedicated to this. Thermo-mechanical challenges arise during thermal cycling of the TES due to thermal expansion of the slag pebbles. This effect causes two major consequences for the pebble bed. Firstly, the contact forces between pebbles increase, resulting in a higher risk of damaging single pebbles. Secondly, the exerted pressure on the surrounding container walls rises, which needs to be considered when dimensioning the container and the inner insulation. For the thermo-mechanical calculations of the packed bed discrete element method (DEM) is used. A simplified DEM model will be presented, which allows calculating very quickly conservative estimates of the forces and stresses in the bed and the container wall. Results will be presented for large scale designs of slag based TES in concentrating solar tower power systems with air as HTF.

Item URL in elib:https://elib.dlr.de/124872/
Document Type:Conference or Workshop Item (Poster)
Title:Concentrated Solar Tower Power Plant using Slag as Inventory Material for a Thermal Energy Storage (TES)
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Krüger, MichaelMichael.Krueger (at) dlr.dehttps://orcid.org/0000-0002-2187-8678
Haunstetter, JürgenJuergen.Haunstetter (at) dlr.deUNSPECIFIED
Zunft, StefanStefan.Zunft (at) dlr.dehttps://orcid.org/0000-0002-8499-3067
Date:13 March 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:TES; slag; CSP
Event Title:12th International Renewable Energy Storage (IRES 2018)
Event Location:Düsseldorf
Event Type:international Conference
Event Dates:13.-15. Mrz. 2018
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: Krüger, Michael
Deposited On:18 Dec 2018 17:00
Last Modified:31 Jul 2019 20:22

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