Abstract
Many active hydrogen recovery systems have been proposed for medium-to-large scale proton exchange membrane fuel cells (PEMFCs). However, relatively few passive solutions for hydrogen recovery in PEMFC systems of such size are available. Accordingly, the present study proposes a novel passive hydrogen recovery system incorporating two vacuum ejectors (one high-flow rate and one low-flow rate) for a 10 kW PEMFC. MATLAB/Simulink models are constructed of the PEMFC system and all its major components. The validity of the simulation model is confirmed via a comparison with the experimental data reported in the literature. Further simulations are then performed to investigate the effects of the fuel stack active area and working temperature on the hydrogen recirculation performance and hydrogen stoichiometric ratio. Overall, the results show that the proposed dual vacuum ejector system increases the fuel cell efficiency to 52.16% and maintains the average fuel cell efficiency at 52.12%.
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