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

Handle URI:
http://hdl.handle.net/10754/594203
Title:
Investigations on a new internally-heated tubular packed-bed methanol–steam reformer
Authors:
Nehe, Prashant; Vanteru, Mahendra Reddy ( 0000-0002-1651-6357 ) ; Kumar, Sudarshan ( 0000-0002-2284-4576 )
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.
KAUST Department:
Clean Combustion Research Center
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
Issue Date:
May-2015
DOI:
10.1016/j.ijhydene.2015.02.114
Type:
Article
ISSN:
0360-3199
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorNehe, Prashanten
dc.contributor.authorVanteru, Mahendra Reddyen
dc.contributor.authorKumar, Sudarshanen
dc.date.accessioned2016-01-19T13:23:45Zen
dc.date.available2016-01-19T13:23:45Zen
dc.date.issued2015-05en
dc.identifier.citationNehe 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.en
dc.identifier.issn0360-3199en
dc.identifier.doi10.1016/j.ijhydene.2015.02.114en
dc.identifier.urihttp://hdl.handle.net/10754/594203en
dc.description.abstractSmall-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.en
dc.publisherElsevier BVen
dc.subjectHydrogen productionen
dc.subjectInternal heatingen
dc.subjectMethanol reformingen
dc.subjectPacked-bed type reformeren
dc.titleInvestigations on a new internally-heated tubular packed-bed methanol–steam reformeren
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalInternational Journal of Hydrogen Energyen
dc.contributor.institutionDepartment of Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai 400076, Indiaen
kaust.authorVanteru, Mahendra Reddyen
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