Method for establishing quasi-two-dimensional model of proton exchange membrane fuel cell
A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell control, fuel cell additives, etc., can solve problems such as ignoring the flow channel gas concentration distribution, achieve good convergence and calculation efficiency, good convergence, Effects that improve accuracy and apply value
Active Publication Date: 2022-05-27
TIANJIN UNIV
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Most of the current analytical models are one-dimensional models, which only consider the changes in the direction perpendicular to the battery plate, while ignoring the gas concentration distribution inside the flow channel
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[0050] The method and steps of the present invention are described in detail below with reference to the accompanying drawings and through specific embodiments;
[0051] The cell structure and related basic parameters are as follows: Overall average current density I = 1.5A cm -2 ; The effective diffusion coefficients of hydrogen / oxygen in the flow channel are: 1.055×10 -4 / 2.652×10 -5 m 2 s -1 ; The intake pressure is one atmosphere, and the hydrogen / oxygen intake concentration is 36.07 / 7.58mol m under the condition of sufficient humidification of the intake -3 ;Intake stoichiometric ratio ST a / ST c For: 1.5 / 2.0, 2.0 / 2.0, 2.5 / 2.0, 2.0 / 1.5, 2.0 / 2.5; runner characteristic length L ch =0.25m; runner depth d ch =1mm;
[0052] (1) Select the initial value of the iteration, divide the flow channel into 5 nodes, and the local current density I of each node k Both are initialized by I to 1.5A cm -2 , each node is substituted into the local current density to solve the phy...
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The invention discloses a method for establishing a quasi-two-dimensional model of a proton exchange membrane fuel cell. The establishment of the model mainly includes: solving the mass transfer equation in the flow channel, solving the local current density along the flow channel and the output voltage of the battery, and forward and reverse flow. In gas mode, iterative solution of quasi-two-dimensional model, etc. Due to the consumption of reactive gas during battery operation, there is a drop in the concentration of reactive gas along the direction of the flow channel, and the change in the reaction rate of the catalytic layer makes the current density of each node of the battery along the direction of the flow channel different. The model considers the actual reaction gas concentration distribution along the flow channel, which can better reflect the local characteristics of battery operation, make the physical process of the model more complete, improve the accuracy and application value of the model, and especially help the stack and system The development of advanced fuel cell models promotes the development of fuel cell practical applications. The solution method of the model has better convergence and computational efficiency, which helps the model to quickly and stably predict the battery operation.
Description
technical field [0001] The invention belongs to the field of electrochemical fuel cells, in particular to a method for establishing a quasi-two-dimensional model of a proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cells have the advantages of high efficiency, zero emission, low temperature start-up, etc., so they are widely considered to have good development potential and application prospects. Compared with the experimental test of the fuel cell, computer simulation can effectively reduce the development cycle and cost, and avoid many interference factors of the experimental test, so it is used as one of the research and development methods. [0003] At present, there are two main ways to build fuel cell models: one is to analyze the mass, momentum, energy and charge transfer process inside the fuel cell through the existing Computational Fluid Dynamics (CFD) software; Based on the assumptions, the governing equations of th...
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IPC IPC(8): H01M8/04298H01M8/04992
CPCY02E60/50
Inventor 焦魁蒋杨
Owner TIANJIN UNIV