- 學位論文
某微型甲醇重組器設計與性能分析
Design and Performance Analysis of a Methanol Reformer of Micro-type
摘要
PEMFC可以應用於微型燃料電池，原因是PEMFC電力密度高，而唯一要克服的是它需要攜帶足夠的氫氣能源。現代甲醇微型重組器可克服氫氣攜帶量的瓶頸，而重組可以利用適當的觸媒改善，其關鍵技術為甲醇重組觸媒種類與塗佈、反應器流道設計及系統控制。 本研究設計甲醇蒸氣重組器，流道尺寸為330μm ×200μm，總長900mm。塗佈觸媒 。參數為反應溫度、進料率與甲醇水溶液濃度。 實驗結果顯示，在實驗設定之220度-320度區間，隨著反應溫度增加，甲醇轉化率與氫氣產生率均大幅提升。在320度時，甲醇進料率 1μl/min，其轉化率接近16%，最高合成氣產量為260μl，相當於0.04W的電力。甲醇濃度效應中，相對於其他水對甲醇比S/C=1.2、1.4、1.8，S/C=1.6都有較好之甲醇轉化率表現。在進料率方面，甲醇轉化率隨著甲醇進料率調升而降低，氫氣產生率則沒有太多改變。反應時間至多只有24秒，欲提升此反應器效率，還需加長反應器流道長度，增加觸媒的塗佈量，並提高流道的密合性。
並列摘要
PEMFC may be applied in micro-scale fuel cell for its high density of energy. However, the disadvantage of the difficulty in storing gaseous hydrogen in the PEMFC system must be overcome. Fortunately, the problem may be solved by a fuel-processing system for generating hydrogen through the reformation of liquid methanol. The reforming process may be greatly improved by the use of some proper catalysts. The key points for the reformer are the type and amount of the catalyst, the design of the reacting channel, and the control of the processing system. In this research, it designed a methanol steam reformer with the channel dimensions of 330μm ×200μm,and a length of 900mm. The catalyst coated on the grooves of reformer is . The parameters include reaction temperature, feed rate, and concentration of methanol water solution. The experimental results show the methanol conversion rate increase with reaction temperature raise at 220-320℃. When reaction temperature at 320℃, and feed rate at 1μl/min , it causes that the methanol conversion rate reaches 16% approximately, and syngas production rate reaches 260μl/ min,equivalent to 0.04W for electric power. For the effect of methanol concentration, molar steam-to-carbon ratio 1.6 has better methanol conversion rate compared with others S/C=1.2, 1.4, and 1.8. For different feed rate, methanol conversion rate decreases when feed rate increase, but hydrogen production rate has no obvious influence. Reaction time has 24 seconds at most. If the efficiency of reformer want to be improved, length of reformer channel should be lengthened, weight of catalyst should be increased, and channel must be more airtight than usual.