毕业论文-燃料电池发电性能影响参数研究.doc

目 录摘 要 II Abstract III 1 绪论 1 1.1 引言 1 1.2 PEMFC氢能发电研究展望 2 1.3 课题研究意义 2 2 PEMFC的研究现状 3 2.1 PTFE和Nafion含量对燃料电池性能的影响 3 2.2膜厚度对PEMFC性能的影响 3 2.3气体扩散层对PEMFC性能的影响 4 2.4催化层对PEMFC性能的影响 5 2.5流场结构对PEMFC性能的影响 5 2.6湿度对PEMFC性能的影响 6 2.7环境条件对燃料电池性能的影响 7 3 PEMFC建模 8 3.1 COMSOL Multiphysics的特点介绍 8 3.2 PEMFC的模型建立 8 3.2.1 模型假设 8 3.2.2 传输方程 8 3.2.3 求解方程的选择 8 3.2.4 定义物理常数 9 4 PEMFC发电性能的研究 12 4.1气体扩散层的孔隙率对PEMFC的影响 14 4.2催化层厚度对PEMFC的影响 15 4.3工作温度对PEMFC的影响 16 4.4压力对PEMFC的影响 17 5总结 19 参考文献 20 致 谢 22 摘 要 质子交换膜燃料电池（PEMFC）具有功率密度高、工作温度低、起动时间短、采用了无毒性的固态电解质不发生泄露等优点。因此，对PEMFC的研究是当今一项重要的课题。 本文首先简单介绍了运用COMSOL Multiphysics对PEMFC的建模。之后运用建立好的模型，分析了不同的孔隙率、催化层厚度、工作温度、压力对PEFMC发电性能的影响。最后得出结论：（1）高孔隙率可提高气体扩散，有利于提高PEMFC的发电性能；（2）提高催化层厚度有利于提高PEMFC的性能；（3）提高工作温度有利于提高PEMFC的发电性能，但不可超过80℃；（4）增加气体压力有利于提高PEMFC的发电性能，但考虑到经济因素，一般把最佳压力控制在0.2MPa。 关键词：PEMFC；发电性能；COMSOL Multiphysics Abstract Proton exchange membrane fuel cell (PEMFC) has the advantage of high power density, low operating temperature, short start time, using non-toxic solid electrolyte and so on. Today, the study of PEMFC has became an important topic. First, this thesis introduces modeling of PEMFC through using COMSOL Multiphysics. Then, this thesis analyzes the performance of PEFMC under different porosity, catalyst layer thickness, operating temperature and pressure by using the well-established model. And the conclusion is: (1) High porosity can improve gas diffusion, help to improve the power performance of PEMFC; (2) Increase the thickness of the catalyst thickness can improve the performance of PEMFC; (3) Improve operating temperature is helpful to improve the electricity performance of PEMFC, but not more than 80℃; (4) Increase the gas pressure can improve the power performance of PEMFC. But considering the economic factors, we generally control the best pressure in 0.2 MPa. Key Words: PEMFC; electricity performance; COMSOL Multiphysics 1 绪论 1.1 引言 质子交换膜燃料电池(Proton Exchange Membrane Fuel Cell，PEMFC)是通过膜电极MEA中气-液-固三项界面的传质、传热而发生电化学反应产生能量的能