PEMFC堆输出性能影响分析与膜含水量监测方法研究

发布时间：2018-02-24 13:49

本文关键词： 质子交换膜燃料电池输出性能监测方法阻抗膜含水量　出处：《中国计量学院》2015年硕士论文　论文类型：学位论文

【摘要】：在燃料电池中,质子交换膜燃料电池(Proton Exchange Membrane Fuel Cell,PEMFC)具有功率密度高、无污染、低温启动等优点,特别适用于人们日常生活中,有着光明的市场应用前景。但是在实际中PEMFC堆输出性能受操作条件(温度、湿度等)影响较大,研究操作条件对PEMFC堆输出性能影响规律可以很好地指导对操作条件的有效控制;此外,PEMFC堆内膜含水量变化难以准确监测,寻求膜含水量监测方法将实现良好的水管理,达到优化输出性能的目的。本文从PEMFC堆工作特性出发,结合其电压-电流(V-I)与阻抗特性,研究了操作条件对PEMFC堆输出性能影响规律,同时提出了一种基于快速电化学阻抗谱法(Electrochemical Imepdance Spetroscopy,EIS)监测膜水含量变化方法。本文主要研究内容如下:1、理论分析与仿真研究。结合PEMFC堆结构与工作特点,分析了影响燃料电池输出性能的原因,得出理论V-I关系式,同时提出V-I参数,简化表达式。其次,利用MATLAB仿真分析了操作条件对输出性能影响的具体变化规律,最后建立了PEMFC等效电路模型。2、实验平台搭建与实验方法设计。为了实现本研究,设计并搭建了水冷型PEMFC堆实验平台与上位机监控软件,同时分别针对PEMFC极化段、欧姆段与浓差段,进行不同操作条件下的V-I与阻抗特性实验。3、实验数据分析与方法提出。通过对不同操作条件下V-I曲线变化规律以及对拟合的阻抗参数的分析,得出PEMFC堆输出性能优化原则与操作条件对V-I参数的影响规律。最后在实验成果的基础上,提出了一种基于快速EIS监测膜水含量变化方法,并通过实验验证了其有效性,这将对PEMFC堆的水管理及实际应用有较大的帮助。
[Abstract]:In fuel cells, proton Exchange Membrane Fuel PEMFCs have the advantages of high power density, no pollution, low temperature start-up and so on, which are especially suitable for people's daily life. But in practice, the output performance of PEMFC reactor is greatly affected by the operating conditions (temperature, humidity, etc.). The study of the effect of operating conditions on the output performance of PEMFC reactor can well guide the effective control of operating conditions. In addition, it is difficult to accurately monitor the change of inner membrane water content in PEMFC reactor. The method of membrane water content monitoring will realize good water management and achieve the purpose of optimizing output performance. Based on the working characteristics of PEMFC reactor, this paper combines its voltage-current V-I) and impedance characteristics. The effect of operating conditions on the output performance of PEMFC reactor is studied. At the same time, a new method for monitoring the water content of the membrane based on electrochemical impedance spectroscopy (EIS) is proposed. The main contents of this paper are as follows: 1, theoretical analysis and simulation, combined with the structure and working characteristics of PEMFC reactor. The reasons that affect the output performance of the fuel cell are analyzed, and the theoretical V-I relation formula is obtained. At the same time, the V-I parameters are put forward and the expression is simplified. Secondly, the specific variation law of the effect of operating conditions on the output performance is analyzed by MATLAB simulation. Finally, the PEMFC equivalent circuit model. 2, experimental platform and experimental method design are established. In order to realize this research, the water cooled PEMFC reactor experimental platform and host computer monitoring software are designed and built. At the same time, the polarization section of PEMFC is designed and built. In the ohmic section and the concentration section, the V-I and impedance characteristic experiments under different operating conditions were carried out. The experimental data were analyzed and the method was put forward. The variation law of V-I curve under different operating conditions and the impedance parameters of fitting were analyzed. The principle of optimizing the output performance of PEMFC reactor and the influence of operating conditions on V-I parameters are obtained. Finally, based on the experimental results, a method for monitoring membrane water content change based on fast EIS is proposed, and its effectiveness is verified by experiments. This will be of great help to the water management and practical application of PEMFC reactor.
【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM911.4

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