| Summary: | 碩士 === 國立清華大學 === 工程與系統科學系 === 102 === A micro-scale compact integrated fuel-processing system consisted of methanol reformer, feed chamber with capillary/diffusers and micro-heater is designed. This study presents the fabrication and testing of integrated reforming device. For the micro-diffuser which minimize the consuming energy, there are two different diffuser angles compared. The analysis and investigation of fluid dynamics characteristics are then achieved. The flows are directed by the reason for the friction loss of the diffuser is lower than that of the nozzle due to a difference in the area of cross-section. Besides, combined with the micro-heater can provide enough heat to start-up the activity of catalyst and reduce heat loss by low surface area simultaneously. The pattern on the micro-chip is manufactured by micro – electro - mechanical systems technique (MEMS), methanol and hydrogen inside are directed by the flow channels. Cu/Mn/Zn is selected as a reforming catalyst for exothermic partial oxidation reaction of methanol (POM) and Ni/Cr alloy is for the metal line on micro-heater. The performance of the methanol reforming system was measured at various test conditions and the optimum operation condition was sought. At the optimum condition, the conversion of methanol is 90.56% and the hydrogen mole rate is 1.175E-05 mol /min. The overall volume of this device is 20 mm(W)×20 mm(L)×2.33 mm(T), can be used for portable installation.
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