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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/106


    Title: 高溫質子交換膜燃料電池之氣體管理策略之研究
    Authors: 許倍銘;HSU, PEI-MING
    Contributors: 機械工程系研究所
    Keywords: 燃料使用率;性能下降;陽極封閉式;高溫質子交換膜燃料電池;排出;hydrogen utilization;dead-ended anode;performance drop;High temperature proton exchange membrane fuel cell (HT-PEMFC);purge
    Date: 2018
    Issue Date: 2019-05-23 12:52:33 (UTC+8)
    Publisher: 機械工程系研究所
    Abstract: 高溫質子交換膜燃料電池具有啟動快、能量密度高、低汙染和不用加濕器等特點,為了提高燃料電池的燃料使用率,高溫質子交換膜燃料電池會使用陽極封閉式的方式,使用方法是在陽極出口處加裝電磁閥來控制。在陽極封閉式下,電池性能會逐漸下降,因此需要定時排出積累氣體使性能回復。性能下降的速率主要受到操作參數影響,包含陰極計量比、陽極提供的氫氣壓力與操作電流密度。為了開發一套高溫質子交換膜燃料電池氣體管理的策略,本篇論文將主要目標鎖定在調查操作參數對於性能下降的影響。在本篇論文中,首先會建立一套數學模型來預測在陽極封閉式下,局部電流密度沿著陽極流道的分布情形,此模型是使用單電池的實驗數據進行擬合;此外,在實際局部電流密度分布的量測上是使用特別設計過的單電池進行實驗。實驗結果顯示電流密度對於性能下降的影響非常顯著,而陰極計量比對性能下降的影響較小,另外在局部電流密度的分布上則會由陽極入口至陽極出口處逐漸遞減,此外建議電磁閥在電池性能下降0.01 V時排出雜質。關鍵詞:高溫質子交換膜燃料電池、陽極封閉式、性能下降、燃料使用率,排出。
    The advantages of high-temperature proton exchange membrane fuel cells (HT-PEMFCs) include fast reaction kinetics, high energy density, less pollution, and no need of humidifiers. In order to increase hydrogen utilization, the HT-PEMFC is operated with a dead-ended anode, in which a solenoid valve is installed at the anode exit. In the dead-end mode, impurities gradually accumulate within the anode channel, causing performance drop of the HT-PEMFC. The performance drop rate is affected by operating parameters, including cathode stoichiometric ratio, supplied hydrogen pressure in the anode, and operating current density. In order to develop a gas management strategy for a HT-PEMFC, this study is aimed for investigating the effects of these factors on the performance drop. In this study a mathematical model is developed to predict the gases and the current density distributions along the anode channel during a dead-ended anode mode. The model is calibrated by experimental data using a single cell. In addition, the current density distribution within the active area at various operating conditions is measured by a specially designed single cell. The results suggest that operating current density significantly influences the performance drop, whereas the cathode stoichiometric ratio shows less impact on the performance drop. The local current density gradually decreases from the anode inlet toward the outlet. The solenoid valve is suggested to purge impurities when the cell voltage drops by 0.01 V.Keyword: High temperature proton exchange membrane fuel cell (HT-PEMFC), dead-ended anode, performance drop, hydrogen utilization, purge.
    Appears in Collections:[機械工程學系] 學位論文

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