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MULTI-SCALE MODELLING OF A SOLAR REACTOR FOR THE HIGH TEMPERATUR STEP OF A SULFUR-IODINE-BASED WATER SPLITTING CYCLE

Haussener, Sophia and Roeb, Martin and Thomey, Dennis and Steinfeld, Aldo (2012) MULTI-SCALE MODELLING OF A SOLAR REACTOR FOR THE HIGH TEMPERATUR STEP OF A SULFUR-IODINE-BASED WATER SPLITTING CYCLE. In: Proceedings of the ASME. ASME 2012 Summer Heat Transfer Conference HT2012, 8.-12. July 2012, Puerto Rico.

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Abstract

The 3-step sulphur-iodine-based thermochemical cycle for splitting water is considered. The high temperature step of the closed-material cycle consists of evaporation, decomposition, and reduction of sulphuric acid to SO2 using concentrated solar process heat. This step is followed by the Bunsen reaction and HI decomposition. The solar reactor concepts proposed are based on a shell-and-tube heat exchanger filled with catalytic packed beds and on a porous ceramic foam to directly absorb solar radiation and act as reaction site. The design, modelling and optimisation of the solar reactor using complex porous structures relies on the accurate determination of their effective heat and mass transport properties. Accordingly, a multi-scale approach is applied. Ceramic foam samples are imaged using high-resolution X-ray tomography to obtain their exact 3D geometrical configuration, which in turn is used in direct pore-level simulations for the determination of the morphological and effective transport properties. These are incorporated in a volume-averaged (continuum) model of the solar reactor. Model validation is accomplished by comparing numerically simulated and experimentally measured temperatures in a 1 kW reactor prototype tested in a solar furnace. The model is further applied to analyze the influence of foam properties, reactor geometry, and operational conditions on the reactor performance.

Item URL in elib:https://elib.dlr.de/77818/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:MULTI-SCALE MODELLING OF A SOLAR REACTOR FOR THE HIGH TEMPERATUR STEP OF A SULFUR-IODINE-BASED WATER SPLITTING CYCLE
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haussener, SophiaETH ZurichUNSPECIFIED
Roeb, MartinUNSPECIFIEDUNSPECIFIED
Thomey, DennisUNSPECIFIEDUNSPECIFIED
Steinfeld, AldoETH ZurichUNSPECIFIED
Date:12 July 2012
Journal or Publication Title:Proceedings of the ASME
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:hydrogen, sulphuric acid, receiver-reactor, foam, SiC
Event Title:ASME 2012 Summer Heat Transfer Conference HT2012
Event Location:Puerto Rico
Event Type:international Conference
Event Dates:8.-12. July 2012
Organizer:ASME
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Roeb, Dr.rer.nat. Martin
Deposited On:20 Nov 2012 17:16
Last Modified:31 Jul 2019 19:37

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