Effect of fuel utilization on the carbon monoxide poisoning dynamics of Polymer Electrolyte Membrane Fuel Cells

JOURNAL OF POWER SOURCES

卷:258

Article

Perez, Luis C.^1,2  Koski, Pauli¹  Ihonen, Jari¹  Sousa, Jose M.^2,3  Mendes, Adelio² 

[1] VTT Tech Res Ctr Finland, Espoo 02044, Finland

[2] Univ Porto, Fac Engn, LEPABE Lab Engn Proc Ambiente Biotecnol & Energia, P-4200465 Oporto, Portugal

[3] Univ Tras Os Montes & Alto Douro, Dept Quim, Escola Ciencias Vida & Ambiente, P-5001801 Vila Real Codex, Portugal

关键词: PEMFC;    Carbon monoxide;    Fuel utilization;    Hydrogen fuel specification;    Gas chromatography;    Impurity enrichment;   

DOI  :  10.1016/j.jpowsour.2014.02.016

来源: Elsevier

【 摘 要 】

The effect of fuel utilization on the poisoning dynamics by carbon monoxide (CO) is studied for future automotive conditions of Polymer Electrolyte Membrane Fuel Cells (PEMFC). Three fuel utilizations are used, 70%, 40% and 25%. CO is fed in a constant concentration mode of 1 ppm and in a constant molar flow rate mode (CO concentrations between 0.18 and 0.57 ppm). The concentrations are estimated on a dry gas basis. The CO concentration of the anode exhaust gas is analyzed using gas chromatography. CO is detected in the anode exhaust gas almost immediately after it is added to the inlet gas. Moreover, the CO concentration of the anode exhaust gas increases with the fuel utilization for both CO feed modes. It is demonstrated that the lower the fuel utilization, the higher the molar flow rate of CO at the anode outlet at early stages of the CO poisoning. These results suggest that the effect of CO in PEMFC systems with anode gas recirculation is determined by the dynamics of its accumulation in the recirculation loop. Consequently, accurate quantification of impurities limits in current fuel specification (ISO 14687-2:2012) should be determined using anode gas recirculation. (C) 2014 Elsevier B.V. All rights reserved.

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