Optimization of hydrogen feeding procedure in PEM fuel cell systems for transportation |
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| Affiliation: | 1. Department of Greenergy, National University of Tainan, Tainan 700, Taiwan;2. Department of Vehicle Engineering, National Formosa University, Yunlin 632, Taiwan;3. Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan;4. Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan;1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Energy Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 637553, Singapore;3. School of Electrical & Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore;1. Research & Advanced Technology Department, SAIC Motor, No. 201 Anyan Road, Shanghai 201804, PR China;2. College of Chemistry and Materials Science, Hubei Engineering University, No. 272 Jiaotong Road, Xiaogan 432000, PR China;3. School of Automotive Studies, Tongji University, No. 4800 Cao''an Road, Shanghai 201804, PR China |
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| Abstract: | The hydrogen feeding sub-system is one of balance of plant (BOP) components necessary for the correct operation of a fuel cell system (FCS). In this paper the performance of a 6 kW PEM (Proton Exchange Membrane) FCS, able to work with two fuel feeding procedures (dead-end or flow-through), was experimentally evaluated with the aim to highlight the effect of the anode operation mode on stack efficiency and durability. The FCS operated at low reactant pressure (<50 kPa) and temperature (<330 K), without external humidification. The experiments were performed in both steady state and dynamic conditions. The performance of some cells in dead-end mode worsened during transient phases, while a more stable working was observed with fuel recirculation. This behavior evidenced the positive role of the flow-through procedure in controlling flooding phenomena, with the additional advantage to simplify the management issues related to hydrogen purge and air stoichiometric ratio. The flow-through modality resulted a useful way to optimize the stack efficiency and to reduce the risks of fast degradation due to reactant starvation during transient operative phases. |
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| Keywords: | PEM fuel cells Fuel cell system Dead-end Hydrogen recirculation Fuel cell durability |
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