Steam Reforming Integrated with Oxidation of Methanol in a Micro-Channel Reactor with Different Micro-Baffle Shapes

Document Type : Research Paper

Author

Department of Chemical Engineering, University of Mazandaran

Abstract

A micro-channel heat exchanger reactor with different micro-baffle shapes has been studied numerically. Governing equations were solved base on the finite volume method with FLUENT software. In upper section, oxidation reaction of methanol was occurred and in lower section, steam reforming of methanol was done. Two sections were separated with solid part which played as heat exchanger and transferred heat from oxidation reaction to steam reforming section. In addition to, straight micro-channel, some other types with different micro-baffle shapes, both sides of solid section, were studied. Micro-baffles are thought to act as static mixers, induce further mixing and improve the convective heat transfer coefficients which eventually expedite heat transfer, so conversion efficiency increases. Also, hydrogen yield obtained with micro-baffle with rectangular shape is 17% higher, on average, than that obtained with the straight configuration. Five different micro-baffles with Rectangular, Triangular, Triangular 90, Trapezoidal and Trapezoidal 90 shapes were studied and higher conversion efficiency for micro-baffles with Trapezoidal shape was achieved.

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References

1. Jang J.Y., Huang Y.X. and Cheng C.H., “The effects of geometric and operating conditions on the hydrogen production performance of a micro-methanol steam reformer”, Chem. Eng. Sci., 2010, 65: 5495.
2. Karakaya  M. and Avci A. K., “Microchannel reactor modeling for combustion driven reforming of iso-octane”, Int. J. Hydrogen Energy, 2011, 36: 6569.
3. Andisheh Tadbir M. and Akbari M. H., “Methanol steam reforming in a planar wash coated micro reactor integrated with a micro-combustor”, Int. J. Hydrogen Energy, 2011, 36: 12822.
4. Stefanidis G. D. and Vlachos D. G., “High vs. low temperature reforming for hydrogen production via micro technology”, Chem. Eng. Sci. 2009, 64: 4856.
5. Arzamendi G., Die´guez P.M., Montes M., Centeno M.A., Odriozola J.A. and Gandı´a L.M., “Integration of methanol steam reforming and combustion in a micro channel reactor for H2 production: A CFD simulation study”, Catal. Today, 2009, 143: 25.
6. Heidary H., Abbassi A. and Kermani M.J., “Enhanced heat transfer with corrugated flow channel in anode side of direct methanol fuel cells”, Energ. Convers. Manage., 2013, 75: 748.
7. Omidbakhsh Amiri E., Hormozi F. and Khoshandam B., “Methanol steam reforming integrated with oxidation in a conical annulus micro-reactor”, Int. J. Hydrogen Energy, 2014, 39: 761.
8. Moreno M., Angela A., Wilhite B., “Autothermal hydrogen generation from methanol in a ceramic micro channel network”, J. Power Sources, 2010, 195: 1964.
9. Reiyu Ch., Yen-Cho Che. and Chung  J.N., “Numerical study of methanol–steam reforming and methanol-air catalytic combustion in annulus reactors for hydrogen production”, Appl. Energ., 2012, 102: 1022.
10. Ni M., “2D heat and mass transfer modeling of methane steam reforming for hydrogen production in a compact reformer”, Energy Convers. Manage., 2013, 65: 155.
11. Omidbakhsh Amiri E., Hormozi F. and Jelveh H., “Reforming integrated with oxidation in a micro-heat exchanger reactor with circular micro-channels”, Iranian J. Hydrogen & Fuel Cell, 2014, 2: 65.

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