Development of a Metal Membrane BtL-Steamreformer in combination with a PEM-Fuel Cell as Auxilliary Power Unit for Heavy-Duty Trucks
The hydrogen required for the operation of the PEM fuel cell can be generated on board by steam reforming of second-generation biofuels. These fuels are particularly suited due to their low content in sulfur and aromatic compounds. In the conventional process, a fuel gas purification system, usually water gas shift reactors (HTS and LTS) and a selective oxidation (SelOx) reactor, is necessary after the steam reforming. With this gas purification it is possible to generate a process gas applicable for fuel cells. Inside the fuel cell the most of the produced hydrogen is converted into electricity and heat. The anode off-gas can be used in a catalytic burner to heat the reformer unit. This recycling of the anode off-gas leads to a complex regulation of the system.
The direct installation of a metal membrane into the reformer unit leads to a reduction of the system volume and system complexity. Hydrogen permeates across the metal membrane with high selectivity. Thus, the chemical gas processing system is replaced. Additionally, the presence of the membrane favorably influences the reaction kinetics inside the reformer and the fuel cell fuelled by very pure hydrogen operates works more efficiently. The reaction temperature in the membrane reformer can be decreased and the system start up and life time can be improved.
|Funded by:||DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V.|
|Cooperation:||ZBT Duisburg, Institut für Mikroverfahrenstechnik Karlsruhe|
|Projectmanager:||Zentrum für BrennstoffzellenTechnik gGmbH Duisburg|