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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 Sattler, Christian and Pitz-Paal, Robert (2007) SOLAR THERMOCHEMICAL GENERATION OF HYDROGEN: DEVELOPMENT OF A RECEIVER REACTOR FOR THE DECOMPOSITION OF SULFURIC ACID. In: ASME Conference Energy Sustainability 2007, ES2007-36071. American Society of Mechanical Engineers. 2007 ASME Energy Sustainability Conference (ES2007), 2007-06-27 - 2007-06-30, Long Beach, CA (USA). ISBN 0-7918-3798-X.

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Abstract

A key step in the sulfur based thermochemical cycles for hydrogen production is the highly endothermic decomposition of sulfuric acid at temperatures between 800 °C and 1200 °C. This reaction can be carried out in a receiver-reactor which is irradiated with concentrated solar radiation from a heliostat field. To investigate this process a test reactor was developed and built. The reaction takes place on the surface of a catalytically coated porous absorber irradiated through a quartz pane of the receiver-reactor. This concept has the advantage of a minimum number of heat transferring steps. Experiments with the test reactor were performed in the DLR solar furnace in Cologne. Firstly the feasibility of a solar decomposition of sulfuric acid in a receiver-reactor containing volumetric absorbers was investigated and proven. Then the reactor was qualified at different operating points. Finally the receiver-reactor and strategy of operation was iteratively optimized with respect to chemical conversion and reactor efficiency. Several test series were performed with variation of the absorber temperature, the mass flow and the dilution rate. Partial pressure of SO<sub>3</sub>, residence time, absorber temperature, and the kind of catalyst applied were identified and quantified as parameters with the most relevant influence on chemical conversion and reactor efficiency. The operation behavior observed and the detailed knowledge of dependencies of different operation parameters assist in evaluating the potential of scaling up the described technology.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:Best Paper Award - Hydrogen Track ASME ES 2007
Title:SOLAR THERMOCHEMICAL GENERATION OF HYDROGEN: DEVELOPMENT OF A RECEIVER REACTOR FOR THE DECOMPOSITION OF SULFURIC ACID
Authors:
AuthorsInstitution or Email of Authors
Noglik, AdamUNSPECIFIED
Roeb, MartinUNSPECIFIED
Rzepczyk, ThomasUNSPECIFIED
Sattler, ChristianUNSPECIFIED
Pitz-Paal, RobertUNSPECIFIED
Date:28 June 2007
Journal or Publication Title:ASME Conference Energy Sustainability 2007
Refereed publication:Yes
In ISI Web of Science:No
Page Range:ES2007-36071
Editors:
EditorsEmail
Somasundaram, SriramUNSPECIFIED
Reddy, AgamiUNSPECIFIED
Rahman, MuhammadUNSPECIFIED
Neumann, AndreasUNSPECIFIED
Publisher:American Society of Mechanical Engineers
Series Name:Energy Susatinability
ISBN:0-7918-3798-X
Status:Published
Keywords:hydrogen, thermocemical cycles, solar hydrogen, sufur iodine, General Atomics
Event Title:2007 ASME Energy Sustainability Conference (ES2007)
Event Location:Long Beach, CA (USA)
Event Type:international Conference
Event Dates:2007-06-27 - 2007-06-30
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:09 Aug 2007
Last Modified:12 Dec 2013 20:25

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