- 學位論文
積體化毛細管與微漸擴流道進料腔之甲醇微型重組器
A Methanol Reformer Integrated with Capillary and Diffusers Based Feed Chamber
摘要
甲醇重組式燃料電池為一整合系統，包括甲醇重組器及質子交換膜燃料電池兩種元件。其中前端甲醇重組器為燃料轉換器，目的是將含氫之甲醇經重組反應後轉換成氫氣提供給質子交換膜燃料電池使用。而後端質子交換膜燃料電池為發電元件，可將氫氣燃料包含的化學能轉為電能。本重組器所使用之部分氧化重組反應(POM)屬於放熱反應，反應物為氣態甲醇且操作溫度需要近200 °C的高溫以提高轉換效率，若外加甲醇蒸散器與加熱器會增加系統的複雜性及降低整體系統效率，因此本實驗將重組器結合微型加熱器與前端漸擴進料反應板，前者可提供少許熱能作為進料汽化熱與觸媒反應起始熱，後者以被動進料方式驅動液體，以耗能較少之毛細管引力與漸擴結構增加甲醇液體流動性與氣體之抗回衝，最後形成一可攜式低耗能之多層產氫裝置。 目前研究已可將此多層被動式甲醇重組器作基本功能測試，以液態甲醇流量為27µl/min、氧氣流量為7.5 ml/min的流量設定可以得到最好的結果，最大的甲醇轉換率可達90.56%，氫氣產率高達1.175E-05 mole/min，未來將繼續進行不同甲醇進料與氧氣不同比例之測試，最後與本實驗室所設計之電池作搭配研究。
並列摘要
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.