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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

DISK SHAPED FUEL PROCESSOR FOR HYDROGEN PRODUCTION IN MICRO FUEL CELL SYSTEMS

Get access (open in a dialog) DOI: 10.1615/IHTC13.p14.60
9 pages

要約

A new micro-reformer design consisting of two equally sized, axially arranged circular disks, each one featuring a centered circular hole as fluid inlet is compared to a conventional design, which is a wall-coated, tubular, straight channel reactor. The preferred reaction route is partial oxidation of methane and dry air in order to produce a large fraction of hydrogen and carbon monoxide. This micro-fuel processor is one unit in a micro fuel cell system and feeds the fuel cell to produce electrical power.
In order to have a fair comparison of the new and the conventional model, the space velocities scaled by volume and catalyst amount and the Peclet number are constant for both models.
The numerical results show that the disk shaped reformer design is a promising alternative to the conventional model, due to its high performance. Hydrogen yield and methane conversion of the disk shaped model are higher if the disk diameter exceeds a certain outer diameter. Carbon monoxide yield of the disk reactor is higher for all diameters. Thus, the fraction of the components that can be used as fuel (e.g. by a solid oxide fuel cell) is higher leading to a higher performance of the new design. Furthermore it is computed that the pressure drop of the new design is significantly lower due to a lower average flow velocity. If the pumping power is included in the efficiency considerations, the advantage of the new disk shaped design becomes even more distinct.