Prediction Method of Curvature Factor of Solid Oxide Fuel Cell Electrode Gas Transport

Abstract

The invention discloses a method for predicting the gas transmission curvature factor of a solid oxide fuel cell electrode. The specific steps are: constructing an equivalent volume unit of the electrode; randomly specifying the physical properties of a small cube, and according to the randomness of the distribution of the solid part and the pore part in the electrode According to the requirement of porosity ε, some small cubes are randomly designated as pores, and the rest are designated as solids to complete the construction of porous electrodes; based on the finite element method and effective medium theory, the effective diffusion coefficient Deff is calculated; based on the capillary model, After rigorous theoretical derivation, the curvature factor is obtained. Based on the randomness of the pore distribution and the finite element technology, the invention overcomes the defects of the experimental method and the ball stacking method, and provides a simple, efficient and accurate new method for predicting the curvature factor of the solid oxide fuel cell electrode gas transmission.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a method for predicting the curvature factor of solid oxide fuel cell electrode gas transmission. Background technique [0002] As the fourth generation of new power generation technology after hydropower, thermal power and nuclear power, fuel cells have attracted the attention of countries all over the world. As the third generation of fuel cells, solid oxide fuel cells are considered to be the most promising fuel cells in the market. Since the "Eighth Five-Year Plan", "Ninth Five-Year Plan", "Tenth Five-Year Plan" and "Eleventh Five-Year Plan", my country has continuously funded the research and development of solid oxide fuel cell technology. The National High Technology Research Program (863 Program) and the National Key Basic Research Development Program (973 Program) have also funded solid oxide fuel cells for many years. Although solid oxide fuel cell technology has...

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Problems solved by technology

Although this method is relatively simple and fast, there are three major problems as follows: (1) The maximum porosity of the electrode model is 0.45, so the case where the porosity is greater than 0.45 cannot be calculated; (2) Since some spherical particles are relatively close, but And there is no contact, which makes the meshing of the electrode model constructed by spherical particles more difficult, or even impossible to complete the meshing; (3) The curvature factor calculated by using the electrode model constructed by spherical particles deviates greatly from the experimental value

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