Optimization Of Flow Channel Parameters And Performance Analysis Of Proton Exchange Membrane Fuel Cell

Proton exchange membrane fuel cell is a power generation device that directly converts chemical energy in fuel into electrical energy.It has the advantages of no carbon emission,no pollution,high efficiency and strong adaptability.It can achieve the goal of energy saving and emission reduction and promote the hydrogen energy industry.develop.At present,most of the research models are based on single-channel or small-scale models,and there are less involved in multi-channel,large-area and full-scale proton exchange membrane fuel cell monolithic models.Therefore,in this paper,based on the version of the proton exchange membrane fuel cell practically applied in a certain research institute,a three-dimensional simulation model of a large area proton exchange membrane fuel cell based on the actual full cell structure is established,and its performance is studied to obtain the optimal design.parameter.In this paper,ANSYS Fluent software is used to simulate the three-dimensional model of proton exchange membrane fuel cell,and the correctness of the model is verified by experimental data.On the basis of the correct model verification,the size of the flow channel on the bipolar plate is designed,and the bipolar plate model with different flow channel width,flow channel depth and number of flow channels is established to explore the effect of changing the flow channel size on the performance of the fuel cell.The results show that the output performance of the fuel cell increases with the decrease of the depth of the flow channel and the increase of the number of the flow channel.At the same time,the parallel flow field of the fuel cell should be dimensioned to ensure that the width of the flow channel is not less than the width of the ridge.When the channel width and ridge width are 0.8 mm,and the channel depth is 0.4 mm,the fuel cell performance is optimal.A six-channel serpentine flow field was further designed to explore the influence of the type of bipolar plate on the output performance of the fuel cell.Compared with the fuel cell with the original parallel flow field,the power density of the six-channel serpentine flow field fuel cell increased by 23.85%.%,greatly improving the output performance of the fuel cell.However,the serpentine flow field produces a large pressure loss,and the reaction gas distribution is not uniform,which increases the energy consumption of the fuel cell system.Finally,the effects of the operating pressure inside the fuel cell,the gas flow rate and the porosity of the gas diffusion layer on the performance of the fuel cell are studied.The results show that increasing the operating pressure and porosity accelerates the transport of the reactant gas through the gas diffusion layer to the catalytic layer,which promotes the electrochemical reaction process of the fuel cell;increasing the intake flow rate can improve the concentration and uniformity of the reactant gas inside the cell.The anode intake air flow has little effect on the performance of the fuel cell.In this paper,the flow field structure size and operating parameters of proton exchange membrane fuel cells are studied,and the influence of flow field structure size and operating parameters on the performance of fuel cells is obtained,which provides guidance for the subsequent research and development of PEMFC.