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Materials for thermochemical energy storage: Experimental investigation of cycling stability

Gollsch, Marie and Stengler, Jana and Spindler, Markus and Linder, Marc (2018) Materials for thermochemical energy storage: Experimental investigation of cycling stability. 20th International Conference on Advanced Energy Materials and Research, 13.-14. Aug. 2018, Dublin, Irland.

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Abstract

Thermochemical energy storage (TCS) uses the reaction enthalpy of reversible chemical reactions. This storage technology contains a so far largely untouched potential: in comparison to sensible and latent thermal energy storage, TCS offers potentially higher storage densities, the possibility of long-term storage as well as the option to upgrade the thermal energy. This upgrade can be realised if the reaction system consists of a solid and a gaseous component. For these gas-solid reactions with the generic equation AB(s) + HR <-> A(s) + B(G) the equilibrium temperature is dependent on the reaction gas partial pressure: the higher the partial pressure, the higher the reaction temperature. Consequently, the charging of the storage can take place at lower temperatures than the discharging by adjustment of the reaction gas partial pressure. Currently, a number of water vapour-solid reactions are investigated as thermochemical storage materials [1-4]. Apart from a general suitability of a reaction system for thermochemical storage, special attention has to be paid to the cycling stability of the reaction. This is often done using thermogravimetric analysis [5]. However, past scale-ups have shown that behaviour of bulks differs from that of analysis amounts [6]. The bulk’s changing properties, however, have proven to be crucial for storage reactor design. The investigation of the cycling stability and reaction behaviour of reacting solid bulks has been our motivation to design and build a cycling test bench. In this experimental setup the gaseous reaction partner is water vapour and can be provided at pressures between 5 kPa and 0.5 MPa. Reactor temperatures can be up to 500 °C. The aim of the presented studies is the automated cycling of about 100 ml solid storage material of reaction systems that have previously shown promise at analysis scale.

Item URL in elib:https://elib.dlr.de/126459/
Document Type:Conference or Workshop Item (Speech)
Title:Materials for thermochemical energy storage: Experimental investigation of cycling stability
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gollsch, MarieMarie.Gollsch (at) dlr.dehttps://orcid.org/0000-0003-0657-9757
Stengler, JanaJana.Stengler (at) dlr.dehttps://orcid.org/0000-0001-6124-8286
Spindler, Markusmarkus.spindler (at) dlr.deUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Date:13 August 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:thermochemical energy storage; storage material; cycling stability; bulk behaviour
Event Title:20th International Conference on Advanced Energy Materials and Research
Event Location:Dublin, Irland
Event Type:international Conference
Event Dates:13.-14. Aug. 2018
Organizer:Conference Series LLC LTD
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: Gollsch, Marie
Deposited On:22 Mar 2019 09:48
Last Modified:22 Mar 2019 09:48

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