Journal Article

FZJ-2021-05437

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A Compact, Self-Sustaining Fuel Cell Auxiliary Power Unit Operated on Diesel Fuel

Samsun, R. C. (Corresponding author)FZJ* ; Prawitz, M.FZJ* ; Tschauder, A.FZJ* ; Weiske, S.FZJ*RWTH* ; Pasel, J.FZJ* ; Peters, R.FZJ*

2021
MDPI Basel

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Please use a persistent id in citations: http://hdl.handle.net/2128/29539  doi:10.3390/en14185909

Abstract: A complete fuel cell-based auxiliary power unit in the 7.5 kWe power class utilizing diesel fuel was developed in accordance with the power density and start-up targets defined by the U.S. Department of Energy. The system includes a highly-integrated fuel processor with multifunctional reactors to facilitate autothermal reforming, the water-gas shift reaction, and catalytic combustion. It was designed with the help of process analyses, on the basis of which two commercial, high-temperature PEFC stacks and balance of plant components were selected. The complete system was packaged, which resulted in a volume of 187.5 l. After achieving a stable and reproducible stack performance based on a modified break-in procedure, a maximum power of 3.3 kWe was demonstrated in a single stack. Despite the strong deviation from design points resulting from a malfunctioning stack, all system functions could be validated. By scaling-up the performance of the functioning stack to the level of two stacks, a power density of 35 We l−1 could be estimated, which is close to the 40 We l−1 target. Furthermore, the start-up time could be reduced to less than 22 min, which exceeds the 30 min target. These results may bring diesel-based fuel cell auxiliary power units a step closer to use in real applications, which is supported by the demonstrated indicators

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-14)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)

Appears in the scientific report 2021

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