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International Journal of Chemical Engineering
Volume 2014, Article ID 412517, 9 pages
http://dx.doi.org/10.1155/2014/412517
Research Article

Experimental Investigation of Based Oxygen Carriers Used in Continuous Chemical-Looping Combustion

1Department of Energy and Environment, Chalmers University of Technology, 412 96 Gothenburg, Sweden
2Department of Inorganic Environmental Chemistry, Chalmers University of Technology, 412 96 Gothenburg, Sweden
3Flemish Institute for Technological Research (VITO), 2400 Mol, Belgium

Received 11 December 2013; Revised 24 March 2014; Accepted 5 April 2014; Published 12 June 2014

Academic Editor: Jerzy Bałdyga

Copyright © 2014 Peter Hallberg et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Three materials of perovskite structure, (M = Mg or Mg and Ti), have been examined as oxygen carriers in continuous operation of chemical-looping combustion (CLC) in a circulating fluidized bed system with the designed fuel power 300 W. Natural gas was used as fuel. All three materials were capable of completely converting the fuel to carbon dioxide and water at 900°C. All materials also showed the ability to release gas phase oxygen when fluidized by inert gas at elevated temperature (700–950°C); that is, they were suitable for chemical looping with oxygen uncoupling (CLOU). Both fuel conversion and oxygen release improved with temperature. All three materials also showed good mechanical integrity, as the fraction of fines collected during experiments was small. These results indicate that the materials are promising oxygen carriers for chemical-looping combustion.