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Modeling of powder bed dynamics in thermochemical heat storage

Prill, Torben und Latz, Arnulf und Jahnke, Thomas (2025) Modeling of powder bed dynamics in thermochemical heat storage. Applied Energy, 383, Seite 125275. Elsevier. doi: 10.1016/j.apenergy.2025.125275. ISSN 0306-2619.

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Offizielle URL: https://www.sciencedirect.com/science/article/pii/S0306261925000054?via%3Dihub

Kurzfassung

Thermochemical energy storage in the CaOCa(OH)2 system offers high energy capacity and near perfect reversibility and is one of the most promising technologies for thermal energy storage. In particular, fixed bed reactors are being investigated for their low cost and simplicity. However, upscaling of these reactors is hindered by changes in heat and mass transfer through the powder bed due to compaction and agglomeration of the powder bed during repeated cycling. Therefore, we develop a model for the dynamics of powder beds in thermochemical reactors in response to gas flow and expansion and contraction during repeated cycling. The model couples a model for the reactive transport in the powder bed to a large strain elastoplastic model for its deformation and compaction. The constitutive relations for the powder bed are based on modified DruckerPragerCap plasticity, including a hardening mechanism. For comparison with experiment, a parametrization of the model using only flow tester data is presented. The capabilities of the new model are demonstrated by simulating multiple charge-discharge cycles, where the numerical results show irreversible effects that cannot be simulated with static models, such as successive powder compaction during cycling. The numerical results are compared with experimental data where qualitative agreement is found. Furthermore, the new model is compared with existing static models and the differences between the models are discussed. Finally, we give an outlook on how the prediction of powder compaction can lead to the design of optimized reactor geometries and cycling protocols.

elib-URL des Eintrags:https://elib.dlr.de/214408/
Dokumentart:Zeitschriftenbeitrag
Titel:Modeling of powder bed dynamics in thermochemical heat storage
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Prill, TorbenTorben.Prill (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Latz, ArnulfArnulf.Latz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Jahnke, ThomasThomas.Jahnke (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:20 Januar 2025
Erschienen in:Applied Energy
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:383
DOI:10.1016/j.apenergy.2025.125275
Seitenbereich:Seite 125275
Verlag:Elsevier
ISSN:0306-2619
Status:veröffentlicht
Stichwörter:Thermal heat storage;Powder plasticity;Simulation;Modeling
HGF - Forschungsbereich:Energie
HGF - Programm:Materialien und Technologien für die Energiewende
HGF - Programmthema:Thermische Hochtemperaturtechnologien
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Thermochemische Prozesse
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Computergestützte Elektrochemie
Hinterlegt von: Prill, Torben
Hinterlegt am:12 Jun 2025 16:58
Letzte Änderung:13 Jun 2025 12:07

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