Numerical Modeling of a Mini/Microchannel Reactor for Methane-Steam Reforming

2010 ◽  
Author(s):  
Daniel Peterson ◽  
Sourabh V. Apte ◽  
Vinod Narayanan ◽  
John Schmitt
Keyword(s):  
Numerical Modeling ◽  
Steam Reforming ◽  
Heat Input ◽  
Stokes Equations ◽  
Neumann Boundary ◽  
Variable Density ◽  
Methane Steam Reforming ◽  
Microchannel Reactor ◽  
Methane Steam ◽  
Production Of Hydrogen

Numerical modeling of methane-steam reforming is performed in a mini/microchannel with heat input through Nickel-deposited channel walls. The low-Mach number, variable density Navier-Stokes equations together with multicomponent reactions are solved using a parallel numerical framework. Methane-steam reforming is modeled by three reduced-order reactions occurring on the reactor walls. The surface reactions in the presence of Nickel catalyst are modeled as Neumann boundary conditions to the governing equations. Effects of the total heat input, heat flux profile, and inlet methane-steam molar concentration on production of hydrogen are investigated in detail.

Detailed Numerical Modeling of a Microchannel Reactor for Methane-Steam Reforming

2011 ◽  
Author(s):  
Kevin Drost ◽  
Benn Eilers ◽  
Daniel Peterson ◽  
Sourabh V. Apte ◽  
Vinod Narayanan ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Correction Factor ◽  
Steam Reforming ◽  
Palladium Catalyst ◽  
Stokes Equations ◽  
Reaction Rates ◽  
Methane Steam Reforming ◽  
Specific Flow ◽  
Methane Steam ◽  
Good Agreement

Numerical modeling of methane-steam reforming is performed in a microchannel with heat input through Palladium-deposited channel walls corresponding to the experimental setup of Eilers [1]. The low-Mach number, variable density Navier-Stokes equations together with multicomponent reactions are solved using a parallel numerical framework. Methane-steam reforming is modeled by three reduced-order reactions occurring on the reactor walls. The surface reactions in the presence of Palladium catalyst are modeled as Neumann boundary conditions to the governing equations. Use of microchannels with deposited layer of Palladium catalyst gives rise to a non-uniform distribution of active reaction sites. The surface reaction rates, based on Arrhenius type model and obtained from literature on packed-bed reactors, are modified by a correction factor to account for these effects. The reaction-rate correction factor is obtained by making use of the experimental data for specific flow conditions. The modified reaction rates are then used to predict hydrogen production in a microchannel configuration at different flow rates and results are validated to show good agreement. It is found that the endothermic reactions occurring on the catalyst surface dominate the exothermic water-gas-shift reaction. It is also observed that the methane-to-steam conversion occurs rapidly in the first half of the mircochannel. A simple one-dimensional model solving steady state species mass fraction, energy, and overall conservation of mass equations is developed and verified against the full DNS study to show good agreement.

Design of an annular microchannel reactor (AMR) for hydrogen and/or syngas production via methane steam reforming

2014 ◽  
Vol 39 (31) ◽  
pp. 18046-18057 ◽  
Author(s):  
Holly Butcher ◽  
Casey J.E. Quenzel ◽  
Luis Breziner ◽  
Jacques Mettes ◽  
Benjamin A. Wilhite ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Methane Steam Reforming ◽  
Microchannel Reactor ◽  
Syngas Production ◽  
Methane Steam

Methane steam reforming in a novel ceramic microchannel reactor

2013 ◽  
Vol 38 (21) ◽  
pp. 8741-8750 ◽  
Author(s):  
Danielle M. Murphy ◽  
Anthony Manerbino ◽  
Margarite Parker ◽  
Justin Blasi ◽  
Robert J. Kee ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Methane Steam Reforming ◽  
Microchannel Reactor ◽  
Methane Steam

Hydrogen Production from Methane Steam Reforming in Combustion Heat Assisted Novel Microchannel Reactor with Catalytic Stacking

2013 ◽  
Vol 52 (39) ◽  
pp. 14049-14054 ◽  
Author(s):  
Chun-Boo Lee ◽  
Sung-Wook Lee ◽  
Dong-Wook Lee ◽  
Shin-Kun Ryi ◽  
Jong-Soo Park ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Methane Steam Reforming ◽  
Microchannel Reactor ◽  
Combustion Heat ◽  
Methane Steam

Co/Al2O3 catalysts promoted with noble metals for production of hydrogen by methane steam reforming

Fuel ◽  
2008 ◽  
Vol 87 (10-11) ◽  
pp. 2076-2081 ◽  
Author(s):  
Luciene P.R. Profeti ◽  
Edson A. Ticianelli ◽  
Elisabete M. Assaf
Keyword(s):  
Steam Reforming ◽  
Noble Metals ◽  
Methane Steam Reforming ◽  
Methane Steam ◽  
Production Of Hydrogen

scholarly journals Production of Hydrogen by Methane Steam Reforming Coupled with Catalytic Combustion in Integrated Microchannel Reactors

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2045 ◽  
Author(s):  
Junjie Chen ◽  
Baofang Liu ◽  
Xuhui Gao ◽  
Deguang Xu
Keyword(s):  
Steam Reforming ◽  
Catalytic Combustion ◽  
Integrated System ◽  
Combustion Stability ◽  
Methane Steam Reforming ◽  
Catalyst Loading ◽  
Microchannel Reactors ◽  
Methane Steam ◽  
Production Of Hydrogen ◽  
Rapid Production

This paper addresses the issues related to the rapid production of hydrogen from methane steam reforming by means of process intensification. Methane steam reforming coupled with catalytic combustion in thermally integrated microchannel reactors for the production of hydrogen was investigated numerically. The effect of the catalyst, flow arrangement, and reactor dimension was assessed to optimize the design of the system. The thermal interaction between reforming and combustion was investigated for the purpose of the rapid production of hydrogen. The importance of thermal management was discussed in detail, and a theoretical analysis was made on the transport phenomena during each of the reforming and combustion processes. The results indicated that the design of a thermally integrated system operated at millisecond contact times is feasible. The design benefits from the miniaturization of the reactors, but the improvement in catalyst performance is also required to ensure the rapid production of hydrogen, especially for the reforming process. The efficiency of heat exchange can be greatly improved by decreasing the gap distance. The flow rates should be well designed on both sides of the reactor to meet the requirements of both materials and combustion stability. The flow arrangement plays a vital role in the operation of the thermally integrated reactor, and the design in a parallel-flow heat exchanger is preferred to optimize the distribution of energy in the system. The catalyst loading is an important design parameter to optimize reactor performance and must be carefully designed. Finally, engineering maps were constructed to design thermally integrated devices with desired power, and operating windows were also determined.

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