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

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

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Abstract

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.

Item URL in elib:https://elib.dlr.de/119640/
Document Type:Conference or Workshop Item (Poster)
Title:Porous media for thermochemical energy storage: experimental investigation on structural changes of reactive materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stengler, JanaJana.Stengler (at) dlr.dehttps://orcid.org/0000-0001-6124-8286
Gollsch, MarieMarie.Gollsch (at) dlr.dehttps://orcid.org/0000-0003-0657-9757
Weiss, Juliusjulius.weiss (at) dlr.deUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Date:14 May 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermochemische Systeme; Wärmetransformation; Gas-Feststoff-Reaktion; Salzhydrat
Event Title:InterPore 2018
Event Location:New Orleans, USA
Event Type:international Conference
Event Dates:14.-17. Mai 2018
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: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Stengler, Jana
Deposited On:19 Oct 2018 09:31
Last Modified:31 Jul 2019 20:17

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