Method for predicting gas transmission curvature factors of solid oxide fuel cell electrode

Abstract

The invention discloses a method for predicting gas transmission curvature factors of a solid oxide fuel cell electrode. The method specially comprises the steps that equivalent volume units of the electrode are built; the physical property of a small cube is designated randomly, according to distribution randomness of a solid part and a pore part in the electrode, part of the small cubes is randomly designated to pores according to the requirement of porosity epsilon, the remaining part of the small cube is designated to a solid body, and building of the porous electrode is completed; on the basis of the finite element method and the effective medium theory, effective diffusion coefficients Deff are calculated; on the basis of a capillaries model, the curvature factors are obtained through strict theoretical derivation. On the basis of randomness and finite element technology of pore distribution, defects of the experimentation method and the ball accumulation method are overcome, and a new simple, efficient and accurate method is provided for predication of the gas transmission curvature factors of the solid oxide fuel cell electrode.

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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