研究生: |
趙皇源 Huang-Yuan Chao |
---|---|
論文名稱: |
質子交換膜燃料電池系統溫度控制 Temperature Control of Proton Exchange Membrane Fuel Cell Stack |
指導教授: |
周宜雄
Yi-Shyong Chou |
口試委員: |
錢義隆
I-Lung Chien 錢玉樹 Yu-Shu Chien 王逢盛 Feng-Sheng Wang |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 126 |
中文關鍵詞: | 溫度控制 、質子交換膜燃料電池 |
外文關鍵詞: | Temperature control, Proton exchange membrane fu |
相關次數: | 點閱:260 下載:0 |
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本研究以數值模擬的方式,探討質子交換膜燃料電池起步階段、負載改變階段之動態,發現有一大量電流負載改變時,會使系統電池溫度超過操作溫度範圍且氧氣過量比下降之氧氣枯竭現象;當電池溫度高於操作溫度範圍內時,將造成高分子薄膜脫水、破裂,嚴重將使燃料電池失去效能,且電池溫度對電池操作的持久性、安全及穩定的輸出效率有深厚的影響,因此如何控制系統電池溫度在適當的操作溫度下為一重要的課題;而氧氣枯竭現象將使高分子薄膜損傷,如何避免此現象的發生,也是現今燃料電池控制的重要議題。
本論文提出兩個控制架構,藉著冷卻水流率控制系統溫度在操作溫度範圍內,分別比較控制效果與韌性;在氧氣枯竭問題,亦提出一控制架構控制氧氣過量比。
This research, by way of numerical simulation, investigated the dynamics of the start-up, and load changing phase of a proton exchange membrane fuel cell; it is known that when there is a large load current change, the fuel cell system’s temperature will exceed the operating temperature and the occurrence of oxygen starvation phenomena which causes the drop in oxygen excess ratio; when the stack temperature exceed the operating range, membrane dehydration and tearing occurs, in severe cases, the fuel cell become dysfunctional. Moreover, since stack temperature has a great impact fuel cell system on the longevity, safety, output stability, the control of the temperature within the operating range is an important topic; in addition, oxygen depletion will damage the membrane and how to avoid the occurrence of oxygen starvation phenomena is also an important issue in the control of fuel cell.
Two control structures have been proposed: by manipulating cooling water flow rate to keep the fuel cell system temperature within the operating range; the performance and robustness of the methods are compared. A control structure to control the oxygen excess ratio is also proposed.
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