Pulsed Gas Feeding for Stoichiometric Operation of a Gas-Solid Vortex Flow Solar Chemical Reactor
Author:
Kra¨upl Stefan1, Steinfeld Aldo2
Affiliation:
1. Solar Process Technology, Paul Scherrer Institute, CH-5232 Villigen, Switzerland 2. ETH-Swiss Federal Institute of Technology, Department of Mechanical and Process Engineering, Institute of Energy Technology, ETH-Zentrum, CH-8092 Zurich, Switzerland
Abstract
The thermodynamic implications of conducting the solar combined ZnO-reduction and CH4-reforming under stoichiometric and non-stoichiometric conditions are examined. For a solar flux concentration ratio of 5000 and for a solar cavity-receiver operating at 1300 K, the solar thermal conversion efficiency is 55 percent for a stoichiometric molar ratio of ZnO and CH4, and decreases by 50 percent when using excess methane by a factor 10 over the stoichiometric molar amount. A technical solution for operating a gas-solid vortex-flow solar reactor under stoichiometric conditions was established by using a pulsed-feed of methane to carry out the particles of ZnO. Using this technique, nearly stoichiometric operation was demonstrated with a prototype reactor in a high-flux solar furnace, thereby opening up a means for efficient conversion of sunlight into chemical fuels.
Publisher
ASME International
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
Reference13 articles.
1. Werder, M., and Steinfeld, A., 2000, “Life Cycle Assessment of the Conventional and Solarthermal Production of Zinc and Synthesis Gas,” Energy - The Int. J. 25, pp. 395–409. 2. Steinfeld, A., Frei, A., Kuhn, P., and Wuillemin, D., 1995, “Solarthermal Production of Zinc and Syngas Via Combined ZnO-Reduction and CH4-Reforming Processes,” Int. J. Hydrogen Energy 20, No. 10, pp. 793–804. 3. Steinfeld, A., Larson, C., Palumbo, R., and Foley, M., 1996, “Thermodynamic Analysis of the Co-Production of Zinc and Synthesis Gas Using Solar Process Heat,” Energy - The Int. J. 21, No. 3, pp. 205–222. 4. Steinfeld, A., Brack, M., Meier, A., Weidenkaff, A., and Wuillemin, D., 1998, “A Solar Chemical Reactor for the Co-Production of Zinc and Synthesis Gas,” Energy - The Int. J. 23, No. 10, pp. 803–814. 5. Weidenkaff, A., Brack, M., Mo¨ller, S., Palumbo, R., and Steinfeld, A., 1999, "Solar Thermal Production of Zinc: Program Strategy and Status of Research, in Proc. 9th SolarPACES International Symposium on Solar Thermal Concentrating Technologies, Font-Romeu, France
Cited by
22 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献
|
|