Étude de dispositifs de recirculation d’hydrogène à pompage électrochimique pour systèmes pile à combustible PEM

Abstract : PEM fuel cells are complex systems involving many auxiliaries. These auxiliaries have an impact on the overall system performance. One possibility to improve the overall performance of the system is to improve the performance of these auxiliaries and in particular the system of hydrogen recirculation.The hydrogen recirculation system allows both the supply of hydrogen to the anode but also the management of the water present within the system. Two solutions are proposed to modify the recirculation system.The first solution uses the hydrogen consumption at the anode as a vacuum pumping mechanism used as the motive power of the recirculation loop. The second solution uses a fuel cell stack as a hydrogen pump which is then integrated into a conventional recirculation loop.Both solutions have been studied analytically, numerically (MATLAB ©, SIMULINK ) and experimentally.The first solution has demonstrated its ability to replace a conventional recirculation pump having equivalent recirculation performances and an equivalent compactness. It permits to improve the overall performance of the fuel cell by 2.5% at nominal power.The second solution has shown a good ability to manage the hydrogen recirculation. Its specificity to solely pump hydrogen opens up the possibility of many other systems. Anodic gases purification appears to be highly promising.
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Benjamin De Grisard. Étude de dispositifs de recirculation d’hydrogène à pompage électrochimique pour systèmes pile à combustible PEM. Energie électrique. Ecole Nationale Supérieure des Mines de Paris, 2014. Français. ⟨NNT : 2014ENMP0082⟩. ⟨tel-01668442⟩

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