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۱Reforming Integrated with Oxidation in Micro–Heat Exchanger Reactor with Circular Micro–Channels
اطلاعات انتشار: Iranian Journal of Hydrogen and Fuel Cell، اول،شماره۲، ۲۰۱۴، سال
تعداد صفحات: ۱۰
Steam reforming integrated with oxidation of methanol was considered with numerical simulation. The parallel micro–channels with circular cross sections were used. Because when the catalytic deposited inside the rectangular micro–channels, it fills up the edges. Hence, the approximation of a cylindrical channel is appropriate. Effect of this changing in cross section was considered and results show conversion is lower in circular model. Also, effects of operating conditions such as inlet temperature, feed flow rate, inlet composition (as steam\carbon ratio) and geometry parameters such as the distance between two rows and two columns were considered. The results show that with increasing inlet temperature and steam\carbon ratio, methanol conversion increases while with increasing feed flow rate, methanol conversion decreases. Geometry parameters are another consideration and the results show that with increasing t1 (the distance between oxidation and steam reforming micro–channels) methanol conversion decreases and with increasing t1\t2 ratio (t2 is the distance between two oxidation micro–channels or two steam reforming micro–channels), methanol conversion increases firstly and then keep almost constant.

۲Steam Reforming Integrated with Oxidation of Methanol in a Micro–Channel Reactor with Different Micro–Baffle Shapes
نویسنده(ها):
اطلاعات انتشار: Iranian Journal of Hydrogen and Fuel Cell، دوم،شماره۲، ۲۰۱۵، سال
تعداد صفحات: ۹
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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