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Comparison of a fuel-driven and steam-driven ejector in solid oxide fuel cell systems with anode off-gas recirculation: Part-load behavior
Ist Teil von
Journal of power sources, 2015-03, Vol.277, p.251-260
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2015
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
This paper investigates the use of ejectors for recirculating anode off-gas in an SOFC system, focusing on the part-load capability of two different systems. In the first system, recirculation was enabled by a fuel-driven ejector. The part-load threshold of this system was determined by carbon formation and was 77.8% assuming a fuel utilization of 70% and suitable ejector geometry. The second system was based on a steam-driven ejector. The simulation results for this system showed an improved part-load capability of 37.8% as well as a slightly improved electrical efficiency. Here, the minimal part load was determined by the condensation temperature of the condenser used in the system.
•We model an SOFC system with anode off-gas recirculation.•A steam and fuel driven ejector are used for recirculation.•Carbon formation limits the part load of a fuel driven ejector system.•The condensation temperature limits the part load of a steam driven ejector system.•A steam driven concept increases the electrical efficiency.