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Simulating the Dehydration Reaction of Calcium Hydroxide in an Indirect-Type Fixed Bed Reactor

Mensing, Max (2021) Simulating the Dehydration Reaction of Calcium Hydroxide in an Indirect-Type Fixed Bed Reactor. Master's, University of Twente.

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Abstract

Thermochemical energy storage can be an important means to facilitate integration of renewable sources into energy supply networks. To seasonally store excess energy for use in times of high demand (e.g. winter), the reversible dehydration reaction of Ca(OH)2 appears to be a promising material for storing energy indefinitely and releasing energy as heat on demand. In this thesis, the dehydration reaction of Ca(OH)2 is investigated comparing experimental results and simulations in an indirectly heated fixed bed reactor. Dehydration by temperature increase and dehydration by pressure reduction are investigated using a 2D rotational symmetric reactor model developed in COMSOL. Additionally, a techno­economic feasibility study is performed to investigate the technology's potential in domestic applications. Results show that qualitatively the simulations can depict processes inside the reactor relatively well but quantitatively there are still major discrepancies observable. For sensible heating, the reactor model provides good results, but more work needs to be done in investigating reaction kinetics and changes in the reactor bed as result of the reaction. Considering economics, results show that for a single­family house, a Ca(OH)2 energy storage system coupled to PV panels on the roof can supply all required energy for one year to a household under favourable conditions.

Item URL in elib:https://elib.dlr.de/144086/
Document Type:Thesis (Master's)
Title:Simulating the Dehydration Reaction of Calcium Hydroxide in an Indirect-Type Fixed Bed Reactor
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mensing, MaxUNSPECIFIEDUNSPECIFIED
Date:2021
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:101
Status:Published
Keywords:simulation; calcium hydroxide / oxide; indirect fixed bed reactor; energy storage
Institution:University of Twente
Department:Faculty of Engineering Technology
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes
Location: Köln-Porz
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Risthaus, Kai
Deposited On:08 Oct 2021 11:41
Last Modified:12 Oct 2021 11:03

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