Two-dimensional model building method of proton exchange membrane fuel cell
A proton exchange membrane and fuel cell technology, applied in fuel cells, fuel cell additives, fuel cell control, etc., can solve problems such as ignoring the flow channel gas concentration distribution, achieve good convergence and calculation efficiency, good convergence, The effect of fast convergence speed
Active Publication Date: 2019-06-11
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 will be described in detail below in conjunction with the accompanying drawings and through specific embodiments.
[0051] The battery structure and related basic parameters are as follows: total average current density I = 1.5A cm -2 ; The effective diffusion coefficients of hydrogen / oxygen in the channel are: 1.055×10 -4 / 2.652×10 -5 m 2 the s -1 ;Intake air pressure is one atmosphere, under the condition of full air intake humidification, hydrogen / oxygen intake concentration is 36.07 / 7.58mol m -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; channel characteristic length L ch =0.25m; channel 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 to 1.5A cm by I -2 , each node is substituted into the local current density to solve the distribution...
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The invention discloses a quasi-two-dimensional model building method of a proton exchange membrane fuel cell. The model building mainly comprises the steps of solving a mass transfer equation in a runner, solving local current density and a battery output voltage along the runner, and performing iterative solution of a quasi-two-dimensional model under cocurrent and counter current air inlet modes. Since a reaction gas is consumed during battery running, the concentration of the reaction gas along a runner direction is reduced, and the density of a current flowing to each node from the cell along the runner is different by change of reaction rate of a catalytic layer; the model considers concentration distribution of actual reaction gas along the runner direction, the local characteristicof battery running can be reflected very well, so that the model physical process is more complete, the accuracy and the application value of the model are improved, the development of an electric stack and a system-level fuel cell model is particularly facilitated, and the development of the actual application field of the fuel cell is promoted; and the model solution method has better convergence and calculation efficiency, and the battery running condition is favorably, rapidly and stably forecasted by the model.
Description
technical field [0001] The invention belongs to the field of electrochemical fuel cells, and in particular relates 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 emissions, and low-temperature start-up, so they are widely considered to have good development potential and application prospects. Compared with the experimental testing of fuel cells, computer simulation can effectively reduce the development cycle and cost, and avoid many interference factors of experimental testing, so it is used as one of the research and development methods. [0003] At present, there are two main ways to establish 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 hypothesis, the governing eq...
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IPC IPC(8): H01M8/04298H01M8/04992
CPCY02E60/50
Inventor 焦魁蒋杨
Owner TIANJIN UNIV