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Experimental Results of a Large Scale Single Tank Thermocline

Odenthal, Christian and Klasing, Freerk and Bauer, Thomas (2018) Experimental Results of a Large Scale Single Tank Thermocline. IRES 2018, 13-15 März 2018, Düsseldorf.

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Abstract

For large scale high temperature thermal energy storage, two-tank molten salt systems mark the current state-of-the-art. New fields of application are emerging, for example, industrial furnaces can shift their energy consumption or conventional power plants could reach lower part load levels. In volatile electricity markets, like in Germany, this increased flexibility enables significant cost reduction potentials. The two-tank concept comprises potential for further cost reductions. A first step is storing the hot and cold phase inside a single tank. The separation of both phases is achieved by their different density or by a floating barrier. Gaining operational experience and deriving optimized operation strategies, promise additional cost reduction potentials. A final step is the thermocline with filler concept, where a large fraction of the salt can be substituted by a low-cost solid material. The “test facility for thermal energy storage in molten salts” (TESIS:store) has been set up at DLR in Cologne. The facility operates at temperatures up to 560°C and a mass flow up to 4kg/s. The storage volume is 22m³. The plant allows the investigation of the thermocline concept with and without filler and gaining widespread operation experience. In this work first experimental results of the thermocline concept without filler are presented. As HTF, solarsalt at maximum temperature is used for several consecutive charging and discharging cycles. 150 thermocouples measure the temperature distribution along the middle axis and additionally at four planes in two radial directions each. The experiments help to understand and improve the molten salt distribution at the inlet regions as well as the development of the thermocline zone. Interest lies in achieving a stable thermocline zone where energetically adverse mixing should be minimized. The development of the thermocline zone and its movement speed through the storage volume are compared to a 1D numerical model.

Item URL in elib:https://elib.dlr.de/123715/
Document Type:Conference or Workshop Item (Poster)
Title:Experimental Results of a Large Scale Single Tank Thermocline
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Odenthal, Christianchristian.odenthal (at) dlr.dehttps://orcid.org/0000-0003-0041-5751
Klasing, FreerkFreerk.Klasing (at) dlr.dehttps://orcid.org/0000-0002-7079-9220
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:March 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:molten salt; thermocline; thermal energy storage; TESIS;
Event Title:IRES 2018
Event Location:Düsseldorf
Event Type:international Conference
Event Dates:13-15 März 2018
Organizer:Eurosolar
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: Köln-Porz
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Odenthal, Christian
Deposited On:26 Nov 2018 10:14
Last Modified:31 Jul 2019 20:21

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