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Numerical analysis of operation conditions and design aspects of a sulfur trioxide decomposer for solar energy conversion

Noglik, Adam and Roeb, Martin and Sattler, Christian and Pitz-Paal, Robert (2012) Numerical analysis of operation conditions and design aspects of a sulfur trioxide decomposer for solar energy conversion. International Journal of Energy Research, 36 (6), pp. 798-808. Wiley.

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A basic concept for a receiver-reactor for solar sulfuric acid decomposition as the key step of the Hybrid Sulfur Cycle for hydrogen production has been developed and realized. A prototype reactor has been built and is specialized for the second part of the reaction, the decomposition of sulfur trioxide. For a detailed understanding of the operational behaviour of the developed reactor type a mathematical model was developed. The reactor model was validated using experimental data from the test operation with a prototype reactor. The present work deals with the optimization of process and design parameters and the evaluation of the achievable performance of the reactor type. Furthermore the reactor model is used for numerical simulations to predict specific operational points of the prototype reactor and the performance of a large-scale reactor on a solar tower. Influences of operational parameters like absorber temperature, feed mass flow, residence time, and initial concentration of the acid are analyzed. In many cases those analyses reveal the existence of an optimum of reactor efficiency. When varying the absorber temperature an optimum of reactor efficiency emerges due to two compensating effects: chemical conversion increases with temperature, whereas re-radiation losses increase disproportionately at the same time. This matches the experimental findings very well. A large scale tower-receiver-reactor consisting of several individual modules is modelled and simulated. The main differences to the prototype system are the reduced gradients of solar flux distribution on the receiver front face and the reduced thermal conduction losses due to the presence of several neighbor modules at a comparable temperature level. This leads to higher chemical conversions and better efficiencies. Reactor efficiencies up to 75 % are predicted.

Item URL in elib:https://elib.dlr.de/79478/
Document Type:Article
Title:Numerical analysis of operation conditions and design aspects of a sulfur trioxide decomposer for solar energy conversion
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Journal or Publication Title:International Journal of Energy Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 798-808
Keywords:solar chemistry, reactor modeling, sulfuric acid decomposition, solar energy, concentrated solar radiation, hybrid sulfur cycle
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Systems (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:06 Dec 2012 11:29
Last Modified:08 Mar 2018 18:38

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