Active and passive fuel recirculation for solid oxide and proton exchange membrane fuel cells

Junbo Hou, Min Yang and Junliang Zhang

Renewable Energy, 2020, vol. 155, issue C, 1355-1371

Abstract: Fuel recirculation is extremely important to fuel cell performance and durability, but it seems not to receive enough consideration so far. We thoroughly reviewed active and passive fuel recirculation for solid oxide fuel cells (SOFCs) and proton exchange membrane fuel cells (PEMFCs). The structure and derivatives of ejectors were introduced, and the critical design criteria from the geometry size were also provided to achieve high entrainment ratio. Three working zones were discussed to better understand the flow behavior and dynamics of primary and secondary flows. We also listed some examples on recirculation pumps as a model of active fuel recirculation from very limited open reports. And then, the application of fuel recirculation in fuel cells, specifically the characteristic functions and effects of fuel recirculation, were comprehensively discussed which include the efficiency, gas management, the steam to carbon ratio (STCR) for SOFCs, and the efficiency, gas management, nitrogen crossover, humidification, flooding and water drainage for PEMFCs. The numerical modeling coupled with experimental results were also reviewed due to its exceptional advantages in exploring the basics and fundamentals related to flows, device design and fuel cell performance.

Keywords: Proton exchange membrane fuel cells (PEMFCs); Solid oxide fuel cells (SOFCs); Ejector; Fuel recirculation; Efficiency; Gas management (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:155:y:2020:i:c:p:1355-1371

DOI: 10.1016/j.renene.2020.04.002

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