Document Type: Full length
Hydrogen and Fuel cell Research Laboratory, Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran
Hydrogen and Fuel Cell Research Lab., Chemical Engineering Dep., Engineering Faculty, University of Kashan
Micro-reformers used for producing hydrogen with a high surface-to-volume ratio in small-scale fuel cells were investigated. To this end, scrutinizing and exploiting all areas of micro reformers is very important. Parallel micro-channels have shown good performance in eliminating dead volumes. Inlet/outlet configuration has great effect on the velocity distribution through micro-channels. In this study, four configurations (1 inlet/1 outlet on the same and opposite sides; 1 inlet/2 outlets on the same and opposite sides) were studied through simulation and 1 inlet/2 outlets on opposite sides were found to have the lowest velocity difference, hence having the best configuration. Simulations were carried out at 600 °C, 1 atm, with S/C=3 and feed flow rate of 100 mL/min. Three channel patterns (i.e., parallel, splitting-jointing and pin-hole) were compared in terms of Figure of Merit (FoM) and specific conversion. Parallel channel design revealed a high value of specific conversion to be about 5.36×10−5 𝑘𝑘𝑘𝑘𝐶𝐶𝐶𝐶4𝑚𝑚2⁄, while splitting-jointing and pin-hole were 5.33×10−5 and 4.91×10−5, respectively. Based on FoM, pin-hole design had a high value of 1.34×10−5 𝑘𝑘𝑘𝑘𝐶𝐶𝐻 4𝑚𝑚2.𝑃𝑃𝑃𝑃⁄, while the values of splitting-jointing and parallel designs were 0.037×10−5 and 1.28×10−5, respectively.