| Summary: | 碩士 === 國立中央大學 === 能源工程研究所 === 97 === This thesis aims to establish a high-temperature solid oxide fuel cell (SOFC) performance testing platform, so that a series of current-voltage curve measurements and analysis for a single-cell stack using different designs of flow distributors can be performed. The SOFC single-cell stack consists of a 40 mm x 40 mm anode-support PEN (positive electrode-electrolyte-negative electrode), two collector layers (nickel meshes for the anode and platinum meshes for the cathode), and home-made pin-type flow distributors with various sizes. Two key geometrical parameters of the pin-type flow distributors, including three different pitch widths (Wpitch = Wpin + Wchannel = 2 mm, 4 mm, 10 mm) and three different values of the pin-width fractions (f = Wpin / Wpitch = 0.33, 0.5, 0.66), are discussed. Experimental results show that the stack performance, i.e., peak power density (PPD), increases with decreasing Wpitch when f fixed as 0.5, and the stack was operated at 850 oC. It is found that flow distribution in the flow distributors with Wpitch = 2 mm is more uniform than that of the case with Wpitch = 10 mm and thus a 7.2 % increase of the PPD can be obtained. Furthermore, the flow distributors with a smaller f can increase the contact area between the reactants and PEN so that the stack using the flow distributors with f = 0.33 can produce a PPD 2.4 % higher than that of the case with f = 0.66. Finally, the effects of the operator conditions, such as the flow rate of the reactants and the operating temperatures, on the stack performance are also discussed.
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