Hybrid power systems based on high temperature fuel cells are a promising technology for the forthcoming distributed power generation market. For the most extended configuration, these systems comprise a fuel cell and a conventional recuperative gas turbine engine bottoming cycle, which recovers waste heat from the cell exhaust and converts it into useful work. The ability of these gas turbines to produce useful work relies strongly on a high fuel cell operating temperature. Thus, if molten carbonate fuel cells or the new generation intermediate temperature solid oxide fuel cells are used, the efficiency and power capacity of the hybrid system decrease dramatically. In this work, carbon dioxide is proposed as the working fluid for a closed supercritical bottoming cycle, which is expected to perform better for intermediate temperature heat recovery applications than the air cycle. Elementary fuel cell lumped-volume models for both solid oxide and molten carbonate are used in conjunction with a Brayton cycle thermodynamic simulator capable of working with open/closed and air/carbon dioxide systems. This paper shows that, even though the new cycle is coupled with an atmospheric fuel cell, it is still able to achieve the same overall system efficiency and rated power than the best conventional cycles being currently considered. Furthermore, under certain operating conditions, the performance of the new hybrid systems beats that of existing pressurized fuel cell hybrid systems with conventional gas turbines. From the results, it is concluded that the supercritical carbon dioxide bottoming cycle holds a very high potential as an efficient power generator for hybrid systems. However, costs and balance of plant analysis will have to be carried out in the future to check its feasibility.
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May 2009
This article was originally published in
Journal of Fuel Cell Science and Technology
Special Section On The 2Nd European Fuel Cell Technology And Applications Conference
A New Concept for High Temperature Fuel Cell Hybrid Systems Using Supercritical Carbon Dioxide
D. Sánchez,
davidsanchez@esi.us.es
D. Sánchez
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain
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R. Chacartegui,
ricardo@esi.us.es
R. Chacartegui
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain
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F. Jiménez-Espadafor,
fcojjea@us.es
F. Jiménez-Espadafor
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain
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T. Sánchez
tmsl@esi.us.es
T. Sánchez
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain
Search for other works by this author on:
D. Sánchez
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spaindavidsanchez@esi.us.es
R. Chacartegui
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spainricardo@esi.us.es
F. Jiménez-Espadafor
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spainfcojjea@us.es
T. Sánchez
Escuela Técnica Superior de Ingenieros de Sevilla
, Camino de los Descubrimientos s/n, 41092 Sevilla, Spaintmsl@esi.us.es
J. Fuel Cell Sci. Technol. May 2009, 6(2): 021306 (11 pages)
Published Online: March 4, 2009
Article history
Received:
January 29, 2008
Revised:
July 21, 2008
Published:
March 4, 2009
Citation
Sánchez, D., Chacartegui, R., Jiménez-Espadafor, F., and Sánchez, T. (March 4, 2009). "A New Concept for High Temperature Fuel Cell Hybrid Systems Using Supercritical Carbon Dioxide." ASME. J. Fuel Cell Sci. Technol. May 2009; 6(2): 021306. https://doi.org/10.1115/1.3080550
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