Direct carbon fuel cells (DCFCs) have great thermodynamic advantages over other high temperature fuel cells such as molten carbonate fuel cells (MCFCs) and solid oxide fuel cells. They can have 100% fuel utilization, no Nernst loss (at the anode), and the produced at the anode is not mixed with other gases and is ready for re-use or sequestration. So far, only studies have been reported on cell development. In this paper, we study the performance of a -producing DCFC system model. The theoretically predicted advantages that are confirmed on a bench scale are also confirmed on a system level, except for the production of pure . Net system efficiencies of around 78% were found for the developed system. An exergy analysis of the system shows where the losses in the system occur. If the cathode of the DCFC must be operated as a standard MCFC cathode, the required at the cathode is the reason why a large part of the pure from the anode is recycled and mixed with the incoming air and cannot be used directly for sequestration. Bench scale studies should be performed to test the minimum amount of needed at the cathode. This might be lower than in a standard MCFC operation due to the pure at the anode side that enhances diffusion toward the cathode.
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e-mail: k.hemmes@tudelft.nl
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October 2010
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Modeling of a Direct Carbon Fuel Cell System
K. Hemmes,
K. Hemmes
Faculty Technology, Policy and Management,
e-mail: k.hemmes@tudelft.nl
Delft University of Technology
, Jaffalaan 5, 2628 BX Delft, The Netherlands
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M. Houwing,
M. Houwing
Faculty Technology, Policy and Management,
Delft University of Technology
, Jaffalaan 5, 2628 BX Delft, The Netherlands
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N. Woudstra
N. Woudstra
Energy Technology Section, Faculty 3mE,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The Netherlands
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K. Hemmes
Faculty Technology, Policy and Management,
Delft University of Technology
, Jaffalaan 5, 2628 BX Delft, The Netherlandse-mail: k.hemmes@tudelft.nl
M. Houwing
Faculty Technology, Policy and Management,
Delft University of Technology
, Jaffalaan 5, 2628 BX Delft, The Netherlands
N. Woudstra
Energy Technology Section, Faculty 3mE,
Delft University of Technology
, Mekelweg 2, 2628 CD Delft, The NetherlandsJ. Fuel Cell Sci. Technol. Oct 2010, 7(5): 051008 (6 pages)
Published Online: July 16, 2010
Article history
Received:
May 26, 2009
Revised:
November 27, 2009
Online:
July 16, 2010
Published:
July 16, 2010
Citation
Hemmes, K., Houwing, M., and Woudstra, N. (July 16, 2010). "Modeling of a Direct Carbon Fuel Cell System." ASME. J. Fuel Cell Sci. Technol. October 2010; 7(5): 051008. https://doi.org/10.1115/1.4001015
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