At Forschungszentrum Jülich GmbH an SOFC system with anode off-gas recirculation loop operating at temperatures up to 160 • C is simulated. To analyze the effect of anode off-gas recirculation, a dynamical system model was implemented in Matlab/Simulink. The results show, that the recirculation rate has a significant effect on the electrical efficiency. In principle, at constant current density high recirculation rates decrease the cell voltage and increase the power demand of the recirculation blower. Therefore, the highest electrical efficiency can be reached with high system fuel utilization, low recirculation rate and in consequence high stack fuel utilization. On the other hand less amount of steam is available for the reforming reaction at low recirculation rates. Therefore, the minimum recirculation rate is determined by the risk of carbon formation. An optimal operation range to avoid carbon formation and to ensure a high electrical efficiency requires recirculation rates between 65 and 70% and system fuel utilizations above 90%.
At the Forschungszentrum Jülich, an SOFC subsystem was built and operated. This subsystem consists of the well-established integrated module, combined with a low temperature off-gas recirculation loop. The recirculation loop is driven by a hermetic side-channel blower that operates at gas temperatures of 160°C. During the test phase, a system fuel utilization of 93% and electrical efficiencies of more than 60% could be demonstrated with the subsystem.
At Forschungszentrum Jülich, an SOFC system with anode off-gas recirculation loop operating at temperatures up to 160 °C is simulated. To analyze the effect of anode off-gas recirculation, a dynamical system model was implemented in Matlab/Simulink®. The results show that the recirculation rate has a significant effect on the electrical efficiency. In principle, at constant current density high recirculation rates decrease the cell voltage and increase the power demand of the recirculation blower. Therefore, the highest electrical efficiency can be reached with high system fuel utilization, low recirculation rate and in consequence high stack fuel utilization. On the other hand less amount of steam is available for the reforming reaction at low recirculation rates. Therefore, the minimum recirculation rate is determined by the risk of carbon formation. An optimal operation range to avoid carbon formation and to ensure a high electrical efficiency requires recirculation rates between 65 and 70 % and system fuel utilizations above 90 %.
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