臺灣博碩士論文加值系統

在質子交換膜燃料電池陽極流道採用封閉式流道，氮氣會由陰極擴散至陽極累積在陽極流道中。在陽極流道中的氮氣累積會造成電池電壓下降，而藉由電磁閥開啟可以使電池電壓回復。電磁閥的開啟策略會因燃料電池的操作點而不同，因此需要建立一動態模型來預測在變動負載下的電池電壓。
在本研究中，建立了一個數學模型，來預測在燃料電池陽極封閉模式下，氮氣因擴散累積在陽極流道中的量，此模型可以表現不同電流對氮氣累積的影響。模型中的參數透過與固定電流的實驗結果比較來調整。
結果中顯示電流及電磁閥開啟頻率對電池電壓造成影響，模型所模擬的結果與實驗得數據有良好的相似度，氫氣的動態變化也可由模型求得。最後會以氮氣囤積量為依據建立電磁閥的開啟策略，並設計變動負載實驗來驗證，看此策略是否能在變動負載情況下讓燃料電池長時間穩定操作。

When a proton exchange membrane fuel cell (PEMFC) system is operated in the dead-ended anode mode, nitrogen will gradually permeate from the cathode to the anode. The accumulation of nitrogen in the anode causes a voltage drop, which can be recovered by purging. The purge strategy depends on the operating conditions of the PEMFC. Thus, a dynamic model that can predict the performance of the PEMFC operated at a varying load is required.
In this study, a mathematical model is developed to estimate the nitrogen crossover and accumulation in the anode of a single cell with anodic dead-end operation. The effect of operating current density on nitrogen crossover is coupled in the model. Parameters in the model are tuned according to the experimental data. The experiments are designed to measure the voltage variation of single cell with dead-ended anode at different operating current densities.
The effect of current density on purge frequency and voltage variations is shown. Simulation results by this calibrated model agree well with experimental data for the voltage variation of the single cell with dead-ended anode. The transient of hydrogen concentration in the anode is investigated by the model. A purge strategy based on the nitrogen accumulation is suggested. The strategy is demonstrated using the signal cell operated at a varying load.

致謝
摘要
ABSTRACT
目錄
圖目錄
表目錄
符號縮寫
符號下標
第一章 緒論
1-1燃料電池介紹
1-1-1燃料電池歷史與發展
1-1-2燃料電池種類
1-2 質子交換膜燃料電池
1-2-1 質子交換膜燃料電池構造
1-2-2 質子交換膜燃料電池工作原理
1-2-3 電池性能曲線
1-2-4 燃料電池效率計算
1-2-5 氣體管理
1-3 研究動機與目的
1-4文獻回顧
第二章 實驗與模型
2-1實驗方法
2-2 實驗設備設置
2-2-2實驗步驟
2-3燃料電池數學模型
2-3-1氣體擴散模型
2-3-2 流道模型
2-3-3 電池電壓模型
第三章 結果與討論
3-1 固定電流實驗
3-1-1 交換膜水含量對電池之影響
3-2 參數調整與驗證
3-2-1 參數調整步驟
3-3 電磁閥開放策略與變動負載實驗
3-3-1 電磁閥開放策略
3-3-2 變動負載實驗
3-3-3 與其他研究比較
3-3-4 變動負載下模型與實驗數據比較
3-3-5 與其他開放策略比較
第四章 結論
參考文獻

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