宋满存,裴普成,曾 夏,查鸿山.PEMFC水淹的阳极气体压力降变化特征预警技术[J].农业机械学报,2014,45(7):340-346.
Song Mancun,Pei Pucheng,Zeng Xia,Zha Hongshan.Flooding Prediction Based on Characteristics of Hydrogen Pressure Drop in PEMFC[J].Transactions of the Chinese Society for Agricultural Machinery,2014,45(7):340-346.
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PEMFC水淹的阳极气体压力降变化特征预警技术   [下载全文]
Flooding Prediction Based on Characteristics of Hydrogen Pressure Drop in PEMFC   [Download Pdf][in English]
投稿时间:2013-10-16  
DOI:10.6041/j.issn.1000-1298.2014.07.052
中文关键词:  质子交换膜燃料电池 水淹预警 阳极气体压力降
基金项目:国家重点基础研究发展计划(973计划)资助项目(2012CB215505)和国家高技术研究发展计划(863计划)资助项目(2012AA1106012、2012AA053402)
作者单位
宋满存 清华大学 
裴普成 清华大学 
曾 夏 清华大学 
查鸿山 清华大学 
中文摘要:通过观察阳极气体压力降对一个两片的质子交换膜燃料电池堆进行水淹预警的研究发现,其在水淹过程中阳极气体压力降具有“两级台阶”的变化特征。结合流道内水积聚过程的研究成果以及电压的变化特点,可以将水淹过程分为良好期、湿润期、过渡期和水淹期4个阶段。对比实验表明电流和温度对于两级台阶的相对幅度影响不大,气体压力和阳极过量系数对台阶相对幅度有较显著的影响。提高气体压力和增大阳极过量系数可以提高PEMFC抵抗水淹的能力,但增大阳极过量系数则会造成氢气浪费。调整电池堆工作温度是一种有效的水淹自愈手段,通过调整温度可以使PEMFC工作在“微湿未淹”的状态下。阳极脉冲排气或增大阳极气体过量系数则可作为PEMFC严重水淹时的辅助处理措施。
Song Mancun  Pei Pucheng  Zeng Xia  Zha Hongshan
Tsinghua University;Tsinghua University;Tsinghua University;Tsinghua University
Key Words:PEMFC Flooding prediction Hydrogen pressure drop
Abstract:Flooding diagnosis is the key issue of PEM fuel cell. Flooding prediction through hydrogen pressure drop is investigated in this study on a two piece PEMFC stack. Pressure drop is a key parameter to diagnose water content of PEM fuel cell. The hydrogen pressure drop is more suitable for flooding prediction because it can reflect not only the content but also the water harm on PEM fuel cell. Furthermore, the ideal hydrogen pressure drop is calculated through the operation conditions. Flooding experiments are organized and a two level characteristic on hydrogen pressure drop is observed. At first, the actual hydrogen pressure drop keeps steady nearly the same as the ideal value, and the voltage is pretty high and constant. Next, the hydrogen pressure drop rises gradually because of the appearance of water droplets. Then, the hydrogen pressure drop performs the second steady level because the water droplets form a liquid film. Finally, the hydrogen pressure drop rises quickly and the voltage drops rapidly as the formation of slug flow. Combining with the visualization results of water droplet accumulation in channels and the tendency of hydrogen pressure drop and voltage, the flooding process can be divided into four continuous periods, which are proper period, humid period, transitional period and flooding period. The growth rate of the hydrogen pressure drop is defined and four groups of flooding experiments are completed, in which the effects of current, temperature, pressure and hydrogen stoichiometry can be discussed. Experiment results show that current and temperature influence little on the growth rate of two levels, while the effect of pressure and hydrogen stoichiometry is remarkable. Increasing the gas pressure can improve the ability for anti flooding in PEMFC, increasing the hydrogen stoichiometry will waste hydrogen as consideration. The hydrogen purge can take a part for a while in the flooding period to prevent the fuel cell from falling into total flooding, while it does not change the operation conditions which lead to flooding. The hydrogen pressure drop should be controlled before the transitional period. The moist section can be planned out in the first half of the humid period based on hydrogen pressure drop. In the moist section, PEM fuel cell is supposed to be far from the occurrence of flooding. Adjusting the fuel cell stack working temperature may be an effective method to realize the flooding prediction.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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