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Design of a Concentrator with a Rectangular Flat Focus and Operation with a Suspension Reactor for Experiments in the Field of Photocatalytic Water Splitting

Wullenkord, Michael and Jung, Christian and Sattler, Christian (2014) Design of a Concentrator with a Rectangular Flat Focus and Operation with a Suspension Reactor for Experiments in the Field of Photocatalytic Water Splitting. In: Proceedings ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology, ES2014-6546 pp. V001T02A034; (9 pages). ASME. 8th International Conference on Energy Sustainability, 30. Jun. - 02. Jul. 2014, Boston, MA, USA. DOI: 10.1115/ES2014-6546 ISBN 978-0-7918-4586-8

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Abstract

Photocatalytic water splitting is a potential route for future carbon-free production of hydrogen. However catalysts still need to be enhanced in order to reach acceptable solar efficiencies. In the context of the project HyCats funded by the Federal Ministry of Education and Research of Germany a high performance test facility for the evaluation of the activity of photocatalysts under practical conditions was established. It mainly consists of a solar concentrator and a planar receiver reactor. A modified linear Fresnel concentrator configuration was chosen based on ray tracing simulation results and improved concerning the number of different facets and the tolerance of tracking errors. It meets the major demand of a homogeneous intensity distribution on the surface of the reactor. The SoCRatus (Solar Concentrator with a Rectangular Flat Focus) is a 2-axes solar concentrator with a geometrical concentration factor of 20.2 and an aperture area of 8.8 m2. The tracking accuracy is better than 0.1° respecting both the solar azimuth and altitude angle. Its 22 highly UV/Vis-reflective flat aluminum mirror facets reflect the sunlight resulting in a rectangular focus with a nominal width of 100 mm and a nominal length of 2500 mm. The reactor is placed in the focal plane at a distance of 2500 mm from the mounting plane of the facets and allows concentrated solar radiation to penetrate suspensions of water, electrolytes and photocatalyst particles flowing through it. Corresponding to a maximum angel of incidence of 36.6° the Quartz window reflects not more than 5% of the incoming radiation and assures only marginal absorption, in particular of the UV-part of the sun’s spectrum. The material of the receiver body is PTFE (polytetrafluoroethylene) providing reflection coefficients above 90% concerning wavelengths of UV-A and UV-B. The special design of the reactor featuring two parallel reaction chambers offers the possibility to test two separate suspensions at the same irradiation conditions. A pump transports the temperate suspension to the reactor. The geometry of the reactor inlet and outlet minimizes critical volumes with inadequate flow. Any evolved gases are separated from the suspension in a tank together with nitrogen introduced in the piping upstream and are analyzed by micro chromatographs. Numerous devices are installed in order to control and monitor the reaction conditions. First experiments have been carried out using methanol as a sacrificial reagent.

Item URL in elib:https://elib.dlr.de/91752/
Document Type:Conference or Workshop Item (Speech)
Title:Design of a Concentrator with a Rectangular Flat Focus and Operation with a Suspension Reactor for Experiments in the Field of Photocatalytic Water Splitting
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wullenkord, Michaelmichael.wullenkord (at) dlr.deUNSPECIFIED
Jung, Christianchristian.jung (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Date:30 June 2014
Journal or Publication Title:Proceedings ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1115/ES2014-6546
Page Range:ES2014-6546 pp. V001T02A034; (9 pages)
Publisher:ASME
ISBN:978-0-7918-4586-8
Status:Published
Keywords:Solar concentrator, Design, Water Rectangular Focus Photocatalytic water Splitting Hydrogen
Event Title:8th International Conference on Energy Sustainability
Event Location:Boston, MA, USA
Event Type:international Conference
Event Dates:30. Jun. - 02. Jul. 2014
Organizer:American Society of Mechanical Engineers
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 - Solar Process Technology (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:10 Nov 2014 15:28
Last Modified:08 Jan 2015 09:20

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