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Thermodynamic and kinetic investigations of the SrBr2 hydration and dehydration reactions for thermochemical energy storage and heat transformation

Stengler, Jana und Bürger, Inga und Linder, Marc (2020) Thermodynamic and kinetic investigations of the SrBr2 hydration and dehydration reactions for thermochemical energy storage and heat transformation. Applied Energy, 277 (115432). Elsevier. doi: 10.1016/j.apenergy.2020.115432. ISSN 0306-2619.

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Offizielle URL: https://www.sciencedirect.com/science/article/pii/S0306261920309442?via%3Dihub

Kurzfassung

The potential of thermochemical energy storage and heat transformation has been soundly highlighted in literature. For applications in the temperature range from approximately 150 °C to 300 °C, the inorganic salt strontium bromide, which reacts with water vapor in an exothermic reaction, is a promising candidate: SrBr2 (s) + H2O (g) ⇌ SrBr2·H2O (s) + ΔRH. This chemical reaction offers a specific energy density of 291 kJ/kg SrBr2 (or 81 kWh/t). The feasibility of a thermochemical energy storage and heat transformer based on the SrBr2/H2O working pair has already been successfully demonstrated on a 1 kW scale in a lab-scale storage unit. Here, we report on the steam pressure-dependent reaction temperatures of the dehydration and hydration reactions as well as the reaction rate and the cycle stability of the reactive system over 100 reaction cycles using thermogravimetric analysis. For distinct operating points, e.g. running the hydration reaction at 180 °C and 69 kPa, specific thermal powers up to 4 kW/kg SrBr2 were experimentally determined. Running the dehydration reaction at 210 °C and 5 kPa steam pressure showed specific thermal powers of 2.5 kW/kg of SrBr2·H2O, thus proving the suitability of SrBr2/H2O as thermochemical working pair for high-power storage applications. Our results provide fundamental material-related data for the design of high-power reactor modules as well as for numerical studies on the potential of thermochemical energy storage and heat transformation based on SrBr2/H2O.

elib-URL des Eintrags:https://elib.dlr.de/135638/
Dokumentart:Zeitschriftenbeitrag
Titel:Thermodynamic and kinetic investigations of the SrBr2 hydration and dehydration reactions for thermochemical energy storage and heat transformation
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Stengler, JanaJana.Stengler (at) dlr.dehttps://orcid.org/0000-0001-6124-8286NICHT SPEZIFIZIERT
Bürger, Ingainga.buerger (at) dlr.dehttps://orcid.org/0000-0002-6091-0431NICHT SPEZIFIZIERT
Linder, Marcmarc.linder (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:25 Juli 2020
Erschienen in:Applied Energy
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:277
DOI:10.1016/j.apenergy.2020.115432
Verlag:Elsevier
ISSN:0306-2619
Status:veröffentlicht
Stichwörter:Thermochemical energy storage, Heat transformation, Strontium bromide, Thermodynamic equilibrium, Thermal hysteresis, Gas–solid reaction kinetics
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:07 Dez 2020 12:10
Letzte Änderung:23 Okt 2023 13:16

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