Development of a methodology to optimize the air bleed in PEMFC systems operating with low quality hydrogen |
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Authors: | Luis C. Pé rez,Taneli Rajala,Jari Ihonen,Pauli Koski,José M. Sousa,Adé lio Mendes |
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Affiliation: | 1. LEPAE – Laboratório de Engenharia de Processos, Ambiente e Energia, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal;2. VTT – Technical Research Centre of Finland, Biologinkuja 3-5, 02044 Espoo, Finland;3. Departamento de Química, Universidade de Trás-os-Montes e Alto Douro, Apartado 202, 5001-911 Vila-Real Codex, Portugal |
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Abstract: | The use of hydrogen with lower quality than that specified in current regulation is an attractive option for stationary PEMFC power production. In this paper, the effect of CO is mitigated using air bleed levels up to 2% in an H2 PEMFC fed with CO concentrations below 20 ppm. A methodology to optimize the air bleed levels is developed using a novel arrangement of cells coupled to a gas chromatograph. The methodology relies on evaluating the distributed performance of the cell and on determining the CO and CO2 molar flow rates at the anode outlet. Furthermore, the amount of CO adsorbed onto the catalyst and the fraction of catalytic sites covered by CO are estimated. The results show that different parameters, such as the H2 volumetric flow rate, CO concentration and air bleed level, influence both the steady state and dynamics of PEMFCs operated with low quality hydrogen. |
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Keywords: | Segmented PEMFC Carbon monoxide Air bleed Gas chromatography Hydrogen quality |
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