Modeling and simulation of microwave double absorption on methanol steam reforming for hydrogen production |
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Authors: | Wei-Hsin Chen Tsung-Chieh ChengChen-I. Hung |
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Affiliation: | a Department of Greenergy, National University of Tainan, Tainan 700, Taiwan, ROC b Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC |
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Abstract: | Methanol steam reforming (MSR) accompanied by methanol decomposition (MD) in an environment with microwave heating is modeled and simulated numerically in the present study. In the developed method, the governing equations simultaneously consider the continuity, momentum, energy, species and Maxwell’s equations. Meanwhile, the double absorption of microwaves by both the reactants and the catalyst bed in the reactor is also taken into account. The heating processes of microwaves on the reactants and the catalyst bed are described by establishing two sets of complex relative permittivity in the non-porous and porous region. The permittivity consists of a dielectric constant and a dielectric loss factor. The obtained results indicate that the developed model can predict MSR and MD accurately. With microwave irradiation, it is found that varying dielectric loss factor in the non-porous region has a significant impact on hydrogen production, revealing that the preheating of the reactants plays a prominent role in determining the performance of MSR. Regarding microwave power, it is observed that increasing power intensifies H2 yield, especially at 500 W where methanol is depleted completely. However, an increase in power also makes MD tend to grow in that the CO2 selectivity decreases. |
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Keywords: | Methanol steam reforming (MSR) Methanol decomposition (MD) Microwave irradiation and heating Hydrogen production and generation Maxwell&rsquo s equation Double absorption Catalyst |
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