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A two-chamber solar receiver-reactor for sulfuric acid decomposition

Thomey, Dennis and Lennartz, Fabian and de Oliveira, Lamark and Schöllgen, Daniel and Roeb, Martin and Sattler, Christian (2011) A two-chamber solar receiver-reactor for sulfuric acid decomposition. ASME 5th International Conference on Energy Sustainability, 7.-10. Aug. 2011, Washington DC, USA.

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Abstract

Fossil energy carriers may be replaced in the future by hydrogen to save fossil resources and to avoid emission of carbon dioxide. To achieve this, a technology for a sustainable and environmentally friendly mass production of hydrogen is needed. A promising way is the application of a thermochemical cycle with solar heat as the energy source offering potentially higher efficiency and economical advantages over other processes. Especially, the Hybrid Sulfur Cycle is a promising candidate for the solar production of hydrogen from water. A key step in this process 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. The reactor contains two chambers with two different porous absorbers to transform the solar radiation into heat. The first absorber is a ceramic foam which enables the evaporation of the liquid H2SO4. The second absorber is a parallel channel monolith with a catalyst coating dedicated for the SO3-dissociation. Experiments with the test reactor were carried out in DLR’s solar furnace in Cologne. Firstly the feasibility of a solar decomposition of sulfuric acid in a porous absorber reactor was investigated and proven. Then the reactor was qualified at different operating points and with different catalyst coatings. Finally, the receiver-reactor and strategy of operation was stepwise improved 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. Mass flow of sulfuric acid, space velocity, and the absorber temperature 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)
Title:A two-chamber solar receiver-reactor for sulfuric acid decomposition
Authors:
AuthorsInstitution or Email of Authors
Thomey, Dennisdennis.thomey@dlr.de
Lennartz, FabianUNSPECIFIED
de Oliveira, Lamarklamark.de-oliveira@dlr.de
Schöllgen, DanielUNSPECIFIED
Roeb, MartinMartin.roeb@dlr.de
Sattler, Christianchristian.sattler@dlr.de
Date:9 August 2011
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Walker, AndyNREL
Status:Published
Keywords:solar, thermochemical cycles, sulfuric acid, hydrogen
Event Title:ASME 5th International Conference on Energy Sustainability
Event Location:Washington DC, USA
Event Type:international Conference
Event Dates:7.-10. Aug. 2011
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 Verfahrenstechnik (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research
Deposited By: Dr.rer.nat. Christian Sattler
Deposited On:12 Dec 2011 13:27
Last Modified:12 Dec 2011 13:27

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