Research And Optimization Analysis Of Three-dimensional Temperature Field Distribution Of Fuel Cell

Solid oxide fuel cell(SOFC)is one of the most promising electric power generating devices.As the SOFC has a complex work process,compared to the traditional experimental methods,simulation methods will be more advantages.SOFC will have a variety of complex reaction process,including flow,electrochemistry,heat transfer and conduction and so on in the operation.The generation and consumption of reactants during electrochemical reactions can affect the distribution of heat,the flow and the performance of the entire stack in the SOFC.Therefore,this paper takes the structure of the new type of flat pile of Ningbo material as the prototype,implements the 3D model of the stack,and optimizes and analyzes the stack.And tried to build a full model of the 3D stack(main pipe,anode,cathode,electrolyte and linker),including a comprehensive multi-field coupling model of heat transfer and mass transfer,flow and chemical reactions.The main contents and conclusions are as follows:1.The first brief description of the 10-layer small cell stack flow field optimization background and the reactor model used on some of the theoretical and specific optimization steps,the first part of the focus is on the hydrogen and air flow uniformity and standard deviation The CFD is used to analyze and optimize the construction location and distribution management scheme of the main air flow in the modular electric hopper.2.The flow field analysis for the 10-layer stack has the following conclusion: i)whether the manifolds were penetrated through the SOFC unit plane would not affect both the fuel and air flow distribution qualities among the piled cell units on stack level.For a small scale planar SOFC stack,the flow distribution quality on stack level was high.The flow distribution quality over each SOFC unit surface,however,should be greatly improved;ii)while the fuel manifolds were placed within the SOFC unit area and penetrated through it,over 31% air would pass through the semicircle zones of the fuel manifold zones;iii)while the air flow manifold was placed within the SOFC unit area,over 14% of the fuel would pass through the semicircle zone of the air manifold zone;iv)while the flow manifolds were penetrated through the cell unit plane,both the fuel and air flow distribution qualities on single cell level would not be greatly improved by adding additional distributors or enlarging the overall outlet manifold areas.3.The optimization of the splitter and the optimization analysis of the import and export arrangement for the 25-layer modular short reactor with porous media,the air-side air-cathode,cathode support layer,cathode and electrolyte for the air-side model,For thefuel model,including the fuel airway,electrolyte,anode support layer,anode,adding the flow,heat and component transmission and so on,through the optimization of the results of the analysis of the flow field distribution and temperature and component distribution,The resulting semicircular shunt structure improves the uniformity of the original structure flow field and the temperature field distribution,while the 1in2 out structure only optimizes the uniformity of the fuel flow distribution,the rest of the temperature distribution and the air side flow And the temperature distribution are not improved,so it is concluded that the use of semicircular shunt structure can increase the service life of the battery stack system,reduce the cost of maintenance and application,can effectively help the commercial development of SOFC.