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Modeling Powder Bed Dynamics in Thermochemical Heat Storage

Prill, Torben und Jahnke, Thomas und Gollsch, Marie und Linder, Marc Philipp (2022) Modeling Powder Bed Dynamics in Thermochemical Heat Storage. Flow and Transport in Permeable Media, 2022-07-17 - 2022-07-22, Les Diablerets Conference Center, Schweiz.

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Kurzfassung

Storing energy in the form of heat has been under long-standing investigation for prospective applications, such as the capturing of excess heat from industrial processes as well as storing energy in concentrated solar power plants. Investigated mechanisms for the heat storage include the adsorption in porous media, materials undergoing phase changes and thermochemical reactions. Among these, thermochemical heat storage provides a large energy capacity and next to perfect reversibility. More specifically, storage in the CaO/Ca(OH)2-System is investigated because of the low price and environmental friendliness of the reactants. In the project THEMSE, DLR is developing models and simulations for thermochemical heat storage in the CaO/Ca(OH)2-System. In this contribution, we shall give an overview over the project and the materials involved. Special attention is given to the investigation of how the cycling of the material influences the heat and mass transport in the porous powder bed inside the reactor. This happens through mechanical and physical alteration of the powder bed, mainly through three mechanisms. First, the gas flow through the reactor exerts a force on the powder particles, compacting the powder bed. The resulting densification of the bed increases its flow resistance, while improving the heat transport. Second, the agglomeration of powder particles, where bonds between the particles form, turning the bed into a solid. The exact mechanism of the agglomeration is unknown, but it can be characterized by mechanical measurements. Third, the expansion of the powder particles through water uptake during the hydration stage, and the corresponding contraction during dehydration. To model the compaction and solidification of the powder bed during cycling, we present a mechanical model based on Drucker-Prager-Cap plasticity, which has been used previously for powder compaction. The parameterization of the model, i.e., the plastic yield surface, is done via flow tester experiments. The changes in the powder bed during cycling are modeled by hardening mechanisms, i.e., a changing yield surface, corresponding to powder compaction and agglomeration, respectively. Then, the plastic model is coupled to a reactor model, simulating the heat and mass transport inside the changing porous powder bed, as well as the thermochemical reaction. This enables the study of the powder bed dynamics under different boundary conditions during cycling, such as pressure drop, water vapor fraction and reactor geometry.

elib-URL des Eintrags:https://elib.dlr.de/189458/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Modeling Powder Bed Dynamics in Thermochemical Heat Storage
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Prill, Torben*Torben.Prill (at) dlr.de
Jahnke, ThomasThomas.Jahnke (at) dlr.de
Gollsch, MarieMarie.Gollsch (at) dlr.dehttps://orcid.org/0000-0003-0657-9757
Linder, Marc PhilippMarc.Linder (at) dlr.dehttps://orcid.org/0000-0003-2218-5301
*DLR corresponding author
Datum:Juli 2022
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Thermochemie, Energiespeicher, Simulation
Veranstaltungstitel:Flow and Transport in Permeable Media
Veranstaltungsort:Les Diablerets Conference Center, Schweiz
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:17 Juli 2022
Veranstaltungsende:22 Juli 2022
Veranstalter :Gordon Research Conferences
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
Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Prill, Torben
Hinterlegt am:18 Nov 2022 12:16
Letzte Änderung:24 Apr 2024 20:50

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