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Modeling of a solar receiver–reactor for sulfur-based thermochemical cycles for hydrogen generation

Noglik, Adam and Roeb, Martin and Sattler, Christian and Pitz-Paal, Robert (2011) Modeling of a solar receiver–reactor for sulfur-based thermochemical cycles for hydrogen generation. International Journal of Energy Research, 35 (5), pp. 449-458. DOI: 10.1002/er.1707.

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Sulfur based thermochemical cycles for hydrogen generation from water have one reaction step in common which is the decomposition of sulfuric acid as one of the most energy consuming steps. The present work deals with the development of a dynamic mathematical model of a solar reactor. for this key step. One of the core parts of the model is a part model of the reaction kinetics of the decomposition of sulfur trioxide, which is based on experiments investigating the kinetics of the used catalyst platinum coated on a ceramic solar absorber. Other part models describe e. g. the absorption of solar radiation, heat conduction in the absorber, convection between gas and the absorber walls and energy losses due to heat radiation. A comprehensive validation of the reactor model is performed using measured data which is gained in experiments with a prototype reactor. The operating behavior of the real reactor is compared with the results of the numerical simulation with the model. The validation is in particular done by reproducing the influences of individual parameters on the chemical conversion and the reactor efficiency. The relative deviations between experimental data and simulation results are mostly within the range of measurement accuracy. In particular the good agreement of calculated values of the derived parameters SO3 conversion and reactor efficiency with those determined from the experiments qualify the model for optimization purposes.

Document Type:Article
Title:Modeling of a solar receiver–reactor for sulfur-based thermochemical cycles for hydrogen generation
AuthorsInstitution or Email of Authors
Roeb, Martinmartin.roeb@dlr.de
Sattler, Christianchristian.sattler@dlr.de
Pitz-Paal, Robertrobert.pitz-paal@dlr.de
Journal or Publication Title:International Journal of Energy Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 449-458
Keywords:hydrogen, thermochemical cycle, volumetric receiver, solar reactor
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
Deposited By: Dr.rer.nat. Martin Roeb
Deposited On:07 Dec 2011 14:36
Last Modified:12 Dec 2013 21:28

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