elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Experimental Study on Sulfur Trioxide Decomposition in a Volumetric Solar Receiver-Reactor

Roeb, Martin and Noglik, Adam and Sattler, Christian and Pitz-Paal, Robert (2008) Experimental Study on Sulfur Trioxide Decomposition in a Volumetric Solar Receiver-Reactor. In: ASME 2nd International Conference on Energy Sustainability, ES2008-54171. Pinehurst Technologies, Inc. ASME 2nd International Conference on Energy Sustainability, 2008-08-10 - 2009-08-14, Jacksonville, Fl (USA). ISBN 0-7918-3832-3.

[img] PDF - Registered users only - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
235kB

Abstract

Process conditions for the direct solar decomposition of sulfur trioxide have been investigated and optimised by using a receiver-reactor in a solar furnace. This decomposition reaction is a key step to couple concentrated solar radiation or solar high temperature heat into promising sulfur based thermochemical cycles for solar production of hydrogen from water. After proof-of-principle a modified design of the reactor was applied. A separated chamber for the evaporation of the sulfuric acid, which is the precursor of sulfur trioxide in the mentioned thermochemical cycles, a higher mass flow of reactants, an independent control and optimisation of the decomposition reactor were possible. Higher mass flows of the reactants improve the reactor efficiency because energy losses are almost independent of the mass flow due to the predominant contribution of re-radiation losses. The influence of absorber temperature, mass flow, reactant initial concentration, acid concentration, and residence time on sulfur trioxide conversion and reactor efficiency have been investigated systematically. The experimental investigations was accompanied by energy balancing of the reactor for typical operational points. The absorber temperature turned out to be most important parameter with respect to both conversion and efficiency. When the reactor was applied for solar sulfur trioxide decomposition only, reactor efficiencies of up to 40 % were achieved at average absorber temperature well below 1000 °C. High conversions almost up to the maximum achievable conversion determined by thermodynamic equilibrium were achieved. As the reradiation of the absorber is the main contribution to energy losses of the reactor a cavity design is predicted to be the preferable way to further raise the efficiency.

Document Type:Conference or Workshop Item (Speech)
Title:Experimental Study on Sulfur Trioxide Decomposition in a Volumetric Solar Receiver-Reactor
Authors:
AuthorsInstitution or Email of Authors
Roeb, MartinUNSPECIFIED
Noglik, AdamUNSPECIFIED
Sattler, ChristianUNSPECIFIED
Pitz-Paal, RobertUNSPECIFIED
Date:10 August 2008
Journal or Publication Title:ASME 2nd International Conference on Energy Sustainability
Refereed publication:Yes
In ISI Web of Science:No
Page Range:ES2008-54171
Editors:
EditorsEmail
ASME, UNSPECIFIED
Publisher:Pinehurst Technologies, Inc
ISBN:0-7918-3832-3
Status:Published
Keywords:sulfuric acid, receiver-reactor, thermo-chemical cycle, solar reactor, hydrogen
Event Title:ASME 2nd International Conference on Energy Sustainability
Event Location:Jacksonville, Fl (USA)
Event Type:international Conference
Event Dates:2008-08-10 - 2009-08-14
Organizer:American Society of Mechanical Engineers
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 Sep 2008
Last Modified:12 Dec 2013 20:32

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.