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Porous media for thermochemical energy storage: experimental investigation on structural changes of reactive materials

Stengler, Jana und Gollsch, Marie und Weiss, Julius und Linder, Marc (2018) Porous media for thermochemical energy storage: experimental investigation on structural changes of reactive materials. InterPore 2018, 2018-05-14 - 2018-05-17, New Orleans, USA.

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Kurzfassung

The use of gas-solid reactions for thermochemical energy storage has been widely discussed in literature. Still, the question of handling a reacting solid on a technically relevant scale is not solved yet: structural changes within the porous solid media need to be considered when designing high-power storage reactors for commercial applications. In an experimental study, we have successfully demonstrated the applicability of strontium bromide and water vapor as a reacting couple: SrBr2∙H2O (s) + ΔH ⇌ SrBr2 (s) + H2O (g) A sample mass of around 100 g of hydrated salt was investigated with regard to its use as thermochemical energy storage material in the temperature range of 200 ℃ to 250 ℃. In our experimental work, we found that the macroscopic and the microscopic properties of the solid bulk material change considerably during the first reaction cycles: the primary particles agglomerated, and the overall volume of the porous bulk ignificantly increased within 27 dehydration/re-hydration cycles. Structural changes in the porous media influence the progression of the gas-solid reaction: A change in bulk material permeability directly affects the vapor mass transfer. Furthermore, the observed structural changes can lead to a reduced bulk thermal conductivity and thus have a negative effect on the thermal performance of a storage reactor. The aim of our work is to enhance the understanding of the decisive factors for the thermal power of a thermochemical reactor and to quantify their impact in wide pressure and temperature ranges (1 kPa – 0.6 MPa, 100 – 320 ℃). Our main objective is the consideration of aging effects of the reactive bulk material when deriving layout rules for the design of high-performance reactors.

elib-URL des Eintrags:https://elib.dlr.de/119640/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Porous media for thermochemical energy storage: experimental investigation on structural changes of reactive materials
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Stengler, JanaJana.Stengler (at) dlr.dehttps://orcid.org/0000-0001-6124-8286NICHT SPEZIFIZIERT
Gollsch, MarieMarie.Gollsch (at) dlr.dehttps://orcid.org/0000-0003-0657-9757NICHT SPEZIFIZIERT
Weiss, Juliusjulius.weiss (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Linder, Marcmarc.linder (at) dlr.dehttps://orcid.org/0000-0003-2218-5301NICHT SPEZIFIZIERT
Datum:14 Mai 2018
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Thermochemische Systeme; Wärmetransformation; Gas-Feststoff-Reaktion; Salzhydrat
Veranstaltungstitel:InterPore 2018
Veranstaltungsort:New Orleans, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:14 Mai 2018
Veranstaltungsende:17 Mai 2018
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Thermische Energiespeicher
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Thermochemische Prozesse (Speicher) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Thermische Prozesstechnik
Hinterlegt von: Stengler, Jana
Hinterlegt am:19 Okt 2018 09:31
Letzte Änderung:24 Apr 2024 20:23

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