Analysis Of Characteristics Of The Experiments On Self-Humidifying Air-Cooled PEMFC

Energy and the environment protection have become two strategic themes of sustainable development of human society. The development and application of wind, solar, hydrogen and other new energy sources have become an inevitable trend. Fuel cell can directly isothermal the chemical energy from the fuel into electricity with high efficiency and zero emissions. The biggest characteristic of this fuel cell is that the reaction process is not involved in burning, so the convertion efficiency is not limited by Carnot cycle.Proton Exchange Membrane Fuel cell (PEMFC), has been widely applied in scattered power station,portable mobile power, uninterruptible power supply, electric cars because it has small volume, light weight, high power density, fast start-up, no noise, zero pollution.PEMFC is a nonlinear, coupling complex system, its working principle involved in fluid mechanics, thermodynamics, electrochemistry, control study and many other disciplines. Part of water generated by fuel cell cathode is blown away by the fan, the rest water is used for humidification in self-humidifying proton exchange membrane fuel cell.Based on the water balance and heat balance control in the fuel cell, the fuel cell improves the fuel cell power output by simplifies the fuel cell system and equipment. The water balance and heat balance management of PEMFC coupled to each other. Effective water and heat management plays a key role in improving the performance and life.Firstly, the anode exhaust cycle experiment is completed based on the home-made self-humidified air-cooled PEMFC test platform, the best scheme is got under different load conditions, and use the Fluck Ti 25 thermal infrared imager to scan the surface temperature of the stack,on which the diagnosis of water flooding fault and analysis of water accumulation effect will be realized.Secondly, the open circuit unit cell voltage of PEMFC is relatively low, only 0.9V-1.0V. Therefore, usually PEMFC stack needs many cells to be connected in series to meet the required load voltage. Cathode fan system has a great influence on the performance of air-cooled PEMFC. The experiments are carried out on the air-cooled PEMFC under the condition of different fan voltages and duct lengths, then gather the unit cell voltage and optimize the fan system through the analysis of output performance.Finally, the short-circuit experiment are carried out on the H-1000 PEMFC.Using the paperless recorder to collect the unit cell voltage,stack current, stack temperature, gas pressure and other parameters to analysis the stack output performance for getting the best short program,and analyzes the influence caused by short circuit of fuel cell and its effect mechanism.At the end of this paper summarizes the research achievements of the above several experiments, also put forward the deficiencies and prospects of the research topic, this paper analyses and prospects.