Numerical Study Of Solid Oxide Fuel Cell Structure Parameters And Channel Design

The channel structure of SOFC has a great influence on the gas distribution in SOFC.When the gas distribution is uneven,it is easy to cause uneven SOFC reaction and uneven heat release,finally,it will cause the electrolyte deform.In order to improve the distribution of gas,domestic and foreign scholars have designed a large number of channel structures.But the current design of channel structures generally has the problems of too complex and cost too much.In order to solve this problem,this subject simulated and analyzed the relevant channel structure of SOFC,the purpose is to design a channel structure that is easy to process.Aiming at the three polarization of fuel cells,a one-dimensional reaction model of SOFC was established using MATLAB.The sensitivity analysis method was used to analyze the related influencing parameters.The subject compared the effects of the three polarization related parameters on the SOFC output curve.The reasonable values of relevant material parameters used in the 3D model simulation were determined.Aiming at the problem that the traditional parallel channel is easy to process but the gas distribution is not uniform,FLUENT is used to establish a three-dimensional model of the parallel channel SOFC.The numerical simulation and optimization of structural parameters and channel design are carried out.The optimal value of rib width was determined.Combined with the simulation results of the new split channel model and SOFC import and export related structural parameters,the gas distribution uniformity and performance of SOFC have been improved.Aiming at the problem that the optimal operating conditions of the corresponding SOFC will be different with the SOFC structure.The subject analyzes the working conditions and gas flow direction of SOFC to determine the optimal working conditions for the improved SOFC.Considering the temperature distribution and output performance,the countercurrent method is determined as the optimal choice.After the above research,the improved single cell is connected to form a SOFC stack,and the optimal working conditions are used to study the multi-physics distribution of the SOFC stack.Comparing the simulation results with the single-cell simulation results,the results show that the SOFC stack model has a more complex structure.The fuel utilization rate,temperature difference distribution and output performance of SOFC have decreased.And the more the number of single cells which form the stack,the more the average performance of each single cell decreases.