Research On Air Humidification System Of Proton Exchange Membrane Fuel Cell

Compared with other types of fuel cells,Proton Exchange Membrane Fuel Cells(PEMFC)have the advantages of high energy efficiency and long service life;The effective control of air relative humidity entering PEMFC stack has an important impact on the durability,stability and reaction efficiency of fuel cell.Therefore,it is of great significance to study the air humidification system of proton exchange membrane fuel cell.This thesis analyzes the working principle and structural composition of proton exchange membrane fuel cell,analyzes the influence of different factors on air relative humidity,designs the overall scheme of PEMFC air humidification system based on bubble humidification,completes the selection of air compressor,and designs key components such as bubble humidifier and gas heating chamber.According to the real parameters and relevant mathematical formulas of the components in the air humidification system of proton exchange membrane fuel cell,the air humidification system model of proton exchange membrane fuel cell is established based on MATLAB / Simulink,including air compressor model,bubbling humidifier model,gas heating chamber model and controller model.According to the typical working conditions of proton exchange membrane fuel cell for domestic passenger cars,the PEMFC air humidification system is simulated and analyzed to verify the performance of the air humidification system.This thesis optimizes the temperature control model of bubbling humidifier based on Fuzzy PID algorithm and fuzzy neural network PID algorithm.The PID parameters are self-tuning through fuzzy rules and neural network self-learning characteristics to optimize the temperature control effect of bubbling humidifier.Through the analysis of simulation results,it is verified that the fuzzy neural network PID algorithm has higher control accuracy of air relative humidity and temperature than the traditional PID algorithm.This thesis develops the test platform of proton exchange membrane fuel cell air humidification system,designs the three-dimensional structure of PEMFC air humidification system test platform based on Solid Works,develops the upper computer software of PEMFC air humidification system test platform based on Lab VIEW,and completes the integration of air humidification system test platform.The performance of the air humidification system is verified by bench test.The control error of air relative humidity and air temperature of the air humidification system is ± 3% and ± 1 ℃.The test results show that the PEMFC air humidification system developed in this thesis meets the requirements of proton exchange membrane fuel cell stack for air relative humidity and temperature.