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Solar Thermochemical Generation of Hydrogen: Development of a Receiver Reactor for the Decomposition of Sulfuric Acid

Noglik, Adam and Roeb, Martin and Rzepczyk, Thomas and Hinkley, Jim and Sattler, Christian and Pitz-Paal, Robert (2009) Solar Thermochemical Generation of Hydrogen: Development of a Receiver Reactor for the Decomposition of Sulfuric Acid. Journal of Solar Energy Engineering, 131. DOI: 10.1115/1.3027505.

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Abstract

A critical step of sulfur based thermochemical cycles for hydrogen production from water is the endothermic recomposition of sulfuric acid. The necessary heat can be provided by concentrated solar radiation. A solar receiver-reactor has been developed and built to investigate this process. Experiments with the test reactor were carried out in the DLR solar furnace in Cologne and confirmed the technical feasibility of a receiver-reactor containing porous ceramics for the decomposition of sulfuric acid. The receiver-reactor and strategy of operation were iteratively optimized with respect to chemical conversion and reactor efficiency. Parametric studies were conducted with varying partial pressure of SO3, residence time, absorber temperature, the presence of catalyst, and the performance of different catalysts to quantify their influence on chemical conversion and reactor efficiency. The absorber temperature distribution was found to be the most crucial process parameter. Conversions close to the equilibrium�in some cases exceeding 90%�were achieved with a platinum catalyst. Thermal efficiencies of up to 35% for the foam vaporizer and 30% for the overall reactor were achieved. Enclosing the absorber in a cavity and using separate chambers for the evaporation and the SO3-decomposition were identified as potential measures to improve the reactor.

Document Type:Article
Title:Solar Thermochemical Generation of Hydrogen: Development of a Receiver Reactor for the Decomposition of Sulfuric Acid
Authors:
AuthorsInstitution or Email of Authors
Noglik, AdamUHDE
Roeb, MartinMartin.roeb@dlr.de
Rzepczyk, ThomasMAN Ferrostaal
Hinkley, JimCSIRO
Sattler, Christianchristian.sattler@dlr.de
Pitz-Paal, Robertrobert.pitz-paal@dlr.de
Date:2009
Journal or Publication Title:Journal of Solar Energy Engineering
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:131
DOI:10.1115/1.3027505
Status:Published
Keywords:hydrogen, solar thermal, thermochemical cycles, sulfuric acid
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 Stoffumwandlung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Technical Thermodynamics > Solar Research
Deposited By: Dr.rer.nat. Christian Sattler
Deposited On:19 Feb 2010 14:21
Last Modified:12 Dec 2013 20:54

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