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    Investigations on a new internally-heated tubular packed-bed methanol–steam reformer

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    Type
    Article
    Authors
    Nehe, Prashant
    Vanteru, Mahendra Reddy cc
    Kumar, Sudarshan cc
    KAUST Department
    Clean Combustion Research Center
    Date
    2015-05
    Permanent link to this record
    http://hdl.handle.net/10754/594203
    
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    Abstract
    Small-scale reformers for hydrogen production through steam reforming of methanol can provide an alternative solution to the demand of continuous supply of hydrogen gas for the operation of Proton Exchange Membrane Fuel Cells (PEMFCs). A packed-bed type reformer is one of the potential designs for such purpose. An externally heated reformer has issues of adverse lower temperature in the core of the reformer and significant heat loss to the environment thus impacting its performance. Experimental and numerical studies on a new concept of internally heated tubular packed-bed methanol-steam reformer have been reported in this paper with improved performance in terms of higher methanol conversion and reduced heat losses to surroundings. CuO/ZnO/Al2O3 is used as the catalyst for the methanol-steam reforming reaction and a rod-type electric heater at the center of the reactor is used for supplying necessary heat for endothermic steam reforming reaction. The vaporizer and the reformer unit with a constant volume catalyst bed are integrated in the annular section of a tubular reformer unit. The performance of the reformer was investigated at various operating conditions like feed rate of water-methanol mixture, mass of the catalyst and reforming temperature. The experimental and numerical results show that the methanol conversion and CO concentration increase with internal heating for a wide range of operating conditions. The developed reformer unit generates 50-80W (based on lower heating value) of hydrogen gas for applications in PEMFCs. For optimized design and operating conditions, the reformer unit produced 298sccm reformed gas containing 70% H2, 27% CO2 and 3% CO at 200-240°C which can produce a power output of 25-32W assuming 60% fuel cell efficiency and 80% of hydrogen utilization in a PEMFC. © 2015 Hydrogen Energy Publications, LLC.
    Citation
    Nehe P, Reddy VM, Kumar S (2015) Investigations on a new internally-heated tubular packed-bed methanol–steam reformer. International Journal of Hydrogen Energy 40: 5715–5725. Available: http://dx.doi.org/10.1016/j.ijhydene.2015.02.114.
    Publisher
    Elsevier BV
    Journal
    International Journal of Hydrogen Energy
    ISSN
    0360-3199
    DOI
    10.1016/j.ijhydene.2015.02.114
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijhydene.2015.02.114
    Scopus Count
    Collections
    Articles; Clean Combustion Research Center

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