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Research Papers

The Load Dependent Purge Strategy

[+] Author and Article Information
Feras Al-Saleh

Technical University Braunschweig,
Institute of Chemical and Process Engineering,
Langer Kamp 7,
Braunschweig 38106, Germany
e-mail: feras.alsaleh@yahoo.de

Vladimir Buday

Institute of Chemical Technology Prague,
Technicka 5,
Prague 6 166 28, Czech Republic
e-mail: vladimirbuday@seznam.cz

Olaf Klein

Technical University Braunschweig,
Institute of Chemical and Process Engineering,
Langer Kamp 7,
Braunschweig 38106, Germany
e-mail: dr.olafklein@gmx.de

Thomas von Unwerth

Technical University Chemnitz,
Department of Alternative Drivetrains,
Chemnitz, Germany
e-mail: thomas.von-unwerth@mb.tu-chemnitz.de

Stephan Scholl

Universität Braunschweig,
Institut für Chemische
und Thermische Verfahrenstechnik,
Langer Kamp 7,
Braunschweig 38106, Germany
e-mail: s.scholl@tu-braunschweig.de

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received June 28, 2011; final manuscript received September 5, 2013; published online October 17, 2013. Assoc. Editor: Abel Hernandez.

J. Fuel Cell Sci. Technol 11(1), 011001 (Oct 17, 2013) (7 pages) Paper No: FC-11-1086; doi: 10.1115/1.4025518 History: Received June 28, 2011; Revised September 05, 2013

In fuel cell systems with an anode recirculation cycle that runs overstoichiometrically, an undesired enrichment of nitrogen and water vapor occurs due to their diffusion through the membrane-electrode-assembly (MEA). This causes an impairment of the power density. So far, this phenomenon was avoided by a time dependent purge strategy. During this process a lot of unconsumed hydrogen gets wasted. A more efficient purge strategy that reduces the waste and improves the system efficiency, which operates load dependently by means of the mass transfer coefficient, is introduced. A comparison of the system efficiency with and without the load-dependent-purge-strategy (LPS) is made and discussed in order to demonstrate the effectiveness of the new method. Static as well as dynamic system simulations were performed for this purpose. A notable improvement of the system efficiency of up to 10% with LPS was achieved. With LPS the purge power losses could be markedly reduced. This reformation also induces an improvement of the system efficiency, which brings us a considerable step forward towards a longer reach. Moreover, LPS is not restricted to a certain fuel cell system and thus affords a more flexible and versatile employment than its predecessor.

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References

Figures

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Fig. 1

A finite control volume of the fuel cell

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Fig. 2

A finite control volume of the cathode

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Fig. 3

A finite control volume of the MEA

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Fig. 4

A finite control volume of the anode

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Fig. 5

Dependence of the fuel cell performance of the molar fraction of the nitrogen in the recirculation cycle

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Fig. 6

Dependence of the fuel cell performance of the molar fraction of the water in the recirculation cycle

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Fig. 7

Finite volume model of a HT-PEM-FC with a recirculation cycle and diffusion processes

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Fig. 8

Balance representation of the jet pump

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Fig. 9

Measurement results of the fuel cell drop in performance over time

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Fig. 10

Comparison of the system efficiency with and without LPS

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Fig. 11

Course of the concentration at the anode exit by NEDC

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Fig. 12

Course of the concentration at the anode exit by Japan10_15

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Fig. 13

Comparison of the system efficiency with and without LPS over the NEDC

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