dc.contributor.advisor Richardson, James T. dc.creator Quon, Willard dc.date.accessioned 2014-11-21T18:34:06Z dc.date.available 2014-11-21T18:34:06Z dc.date.created August 2012 dc.date.issued 2012-08 dc.identifier.uri http://hdl.handle.net/10657/773 dc.description.abstract A small-scale steam-methane reforming system for localized, distributed production of hydrogen offers improved performance and lower cost by integrating the following technologies developed at the University of Houston; (1) Catalyzed steam-methane reforming on ceramic foam catalyst substrates. (2) Coupling of reformers to remote heat sources via heat pipes instead of heating by direct-fired heaters. (3) Catalytic combustion of methane with air on ceramic foam substrates as the heat source. Each of these three technologies confer benefits improving the efficiency, reliability, or cost of an integrated compact steam-methane reforming system. A prior 2-D computer model was adapted from existing FORTRAN code for a packed-bed reactor and successfully updated to better reflect heat transfer in the ceramic foam bed and at the reactor wall, then validated with experimental heat transfer and reaction data for use in designing commercial-scale ceramic foam catalytic reactors. Different configurations and sizes of both reformer and combustor reactors were studied to arrive at a best configuration for an integrated system. The radial and axial conversions and temperatures of each reactor were studied to match the heat recovery capability of the reformer to the heat generation characteristics of the combustor. The vetted computer model was used to size and specify a 500 kg/day hydrogen production unit featuring ceramic foam catalyst beds integrated into heat pipe reactors that can be used for multiple end users, ranging from small edible fats and oils hydrogenators to consumer point of sale hydrogen fueling stations. The estimated investment for this 500 kg/day system is $2,286,069 but is expected to drop to less than$1,048,000 using mass production methods. Economic analysis of the 500 kg/day hydrogen production system shows that it is not presently competitive with gasoline as a transportation fuel, but the system is still economically attractive to stationary fuel cell applications or small chemical users with a delivered hydrogen price as low as \$1.49/kg, even with a 10% IRR that includes investment recovery, depreciation, taxes, etc. dc.format.mimetype application/pdf dc.language.iso eng dc.rights The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s). dc.subject Ceramic foam catalyst support dc.subject Heat pipe reactors dc.subject Steam methane reforming dc.subject Catalytic combustion dc.subject Distributed hydrogen production dc.subject 2D modeling dc.subject.lcsh Catalytic reforming dc.subject.lcsh Chemical engineering dc.title A Compact and Efficient Steam Methane Reformer for Hydrogen Production dc.date.updated 2014-11-21T18:34:06Z dc.type.genre Thesis thesis.degree.name Doctor of Philosophy thesis.degree.level Doctoral thesis.degree.discipline Chemical Engineering thesis.degree.grantor University of Houston thesis.degree.department Chemical and Biomolecular Engineering, Department of dc.contributor.committeeMember Harold, Michael P. dc.contributor.committeeMember Jacobson, Allan J. dc.contributor.committeeMember Epling, William S. dc.contributor.committeeMember Rixey, William G. dc.contributor.committeeMember Fleischer, Miguel dc.type.dcmi Text dc.format.digitalOrigin born digital dc.description.department Chemical and Biomolecular Engineering, Department of thesis.degree.college Cullen College of Engineering
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