Proton Exchange Membrane Fuel Cell Test Platform Construction And Performance Optimization

With the continuous advancement of social industrialization,the development of industrialization is inseparable from the supply of electric energy.Electricity consumption in commercial buildings is also an important part of the main energy consumption.At present,the electricity used in commercial buildings is mainly centralized supply,and centralized power supply will cause a large amount of energy loss,and the energy utilization rate is low.The rational use of hydrogen fuel cells to build distributed power stations can effectively improve energy utilization.Therefore,as a new type of power source,fuel cells are a new trend of clean energy supply and have considerable market prospects.At present,there are few domestic experiments on multi-stack gas supply and load lifting in parallel.In order to make up for the gap in this field,this thesis builds a fuel cell test platform system and connects each device.The exchange membrane fuel cell has been tested for performance.At the same time,the solidworks software is used to optimize the design of the multi-stack parallel intake duct model,and the simplified two-dimensional model is simulated and analyzed by the ANSYS Fluent software.Finally,according to the flow simulated by the ANSYS Fluent software,the COMSOL software was used to model and simulate the single flow channel in the fuel cell,which verified the correctness of the multi-stack parallel air supply channel modelThe thesis uses the experimental method of controlling variable parameters to test the parameters that affect the fuel cell power generation performance one by one.The influencing parameters include current step signal,hydrogen flow rate,air flow rate,stoichiometric ratio and operating temperature.It is concluded through experiments that when setting the step signal to increase the load,the current signal change amplitude should not be too large,otherwise it will damage the fuel cell.The 40A current step signal amplitude is more appropriate;the results of hydrogen and air flow tests are similar.When the gas flow rate is low,changing the flow rate can violently influence the power generation,besides as the gas flow rate increases to a certain value,the power generation performance gradually tends to be saturated;changing the air stoichiometric ratio,it is found that the air stoichiometric ratio is increased,The output power at both ends of the fuel cell is increasing.The best air stoichiometric ratio in this experiment is 1.8;the best working temperature of PEMFC in this experiment is 60℃.When carrying out multi-stack gas supply and load lifting in parallel,it was found that the power generation efficiency when three piles were connected in parallel for gas supply due to the unreasonable design of the gas supply pipeline was lower than the power generation efficiency when the single pile was lifted.Aiming at this problem,this thesis optimizes the design of the gas supply pipeline model of three stacks in parallel.And through the simulation of ANSYS Fluent software,the optimized model can distribute the air volume more evenly.The three outlet velocities are 2.734 m/s,2.790 m/s and 2.700 m/s.And according to the simulation of the average flow rate obtained by the simulation of the single flow channel in the COMSOL software,it is obtained that the current density of the single flow channel is 977.98mA/cm2,the conversion success rate is 9687.5W,which is similar to the experimentally measured single stack The result of lifting power is well fitted,which verifies the reliability of the optimized model.