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Modification of Fine-Grained Powder to Facilitate a Moving Reaction Bed for Thermochemical Energy Storage

Roßkopf, C. and Linder, M. and Wörner, A. (2013) Modification of Fine-Grained Powder to Facilitate a Moving Reaction Bed for Thermochemical Energy Storage. uropean Congress and Exhibition on Advanced Materials and Processes, Sevilla, Spanien.

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Dispatchable power generation is one important advantage of concentrated solar power (CSP) plants, if high-performance thermal energy storages are included. Thermochemical energy storages can make a decisive contribution because of their low material cost, high energy densities and heat transformation possibility. For an appropriate temperature range (~500°C) the reversible gas-solid reaction of calcium oxide with water vapor to calcium hydroxide is investigated: CaO(s) + H2O(g) ⇌ Ca(OH)2 + ΔHR In order to release a constant power level over a long period of time (night cycle), it is necessary to separate the power from the capacity of the storage unit. For this purpose, the gravity-induced flow of the reaction material through small reactor geometry is highly promising. However, due to its cohesive characteristic, the material tends to agglomerate during cycling and shows poor flow behavior leading to plugging within the reactor. Approaches of the bulk industries have demonstrated improvements of flowability of organic materials by adding nanoparticles to bulk material in order to decrease the Van-der-Waals forces. However, this enhancement is not established for high temperatures, reacting conditions and inorganic materials. In this contribution, the approach to optimize the flow behavior of thermochemical storage material and the prevention of agglomeration by addition of nanomaterial is presented. Furthermore, miscellaneous advantages of the gravity-induced moving bed reactor are given.

Item URL in elib:https://elib.dlr.de/85532/
Document Type:Conference or Workshop Item (Speech)
Title:Modification of Fine-Grained Powder to Facilitate a Moving Reaction Bed for Thermochemical Energy Storage
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:September 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Thermochemische Wärmespeicher, Calciumhydroxid, Nanopartikel, Wanderbett
Event Title:uropean Congress and Exhibition on Advanced Materials and Processes
Event Location:Sevilla, Spanien
Event Type:international Conference
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Roßkopf, Christian
Deposited On:28 Nov 2013 11:53
Last Modified:08 May 2014 23:19

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