CN-122021441-A - Numerical simulation method and system for AEM electrolytic tank flow field

CN122021441ACN 122021441 ACN122021441 ACN 122021441ACN-122021441-A

Abstract

The invention provides a numerical simulation method and a system of an AEM electrolytic tank flow field, which relate to the technical field of AEM electrolytic tanks, and the method comprises the steps of constructing an AEM electrolytic tank three-dimensional model; the method comprises the steps of carrying out meshing treatment on an AEM electrolytic tank three-dimensional model, setting an electrochemical mass source item, a bubble motion volume force source item and a temperature field volume average model on the basis of the AEM electrolytic tank three-dimensional model after meshing treatment, constructing an AEM electrolytic tank flow field CFD two-phase flow coupling heat transfer simulation model based on the electrochemical mass source item, the bubble motion volume force source item and the temperature field volume average model, and simulating the numerical value of the AEM electrolytic tank flow field through the AEM electrolytic tank flow field CFD two-phase flow coupling heat transfer simulation model. The invention can accurately capture the flow velocity gradient and temperature gradient distribution characteristics of the area, thereby improving the calculation accuracy of the gas-liquid two-phase flow coupling heat transfer simulation.

Inventors

JI XIAOLONG
LI YANG
FU CEHUANG
YANG LIU
ZHU SHAOBO
LI TONGTONG
Sang Longjian
FU YALIN

Assignees

浙江阳光绿色氢能科技有限公司
浙江阳光绿色氢能装备有限公司

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (10)

1. The numerical simulation method of the AEM electrolytic tank flow field is characterized by comprising the following steps of: S1, constructing an AEM electrolytic cell three-dimensional model; s2, performing gridding treatment on the AEM electrolytic tank three-dimensional model; s3, setting an electrochemical mass source item, a bubble motion volume force source item and a temperature field volume average model on the basis of the AEM electrolytic tank three-dimensional model after gridding treatment; s4, constructing an AEM electrolytic tank flow field CFD two-phase flow coupling heat transfer simulation model based on the electrochemical mass source item, the bubble motion volume force source item and the temperature field volume average model; S5, simulating the numerical value of the AEM electrolytic tank flow field through the AEM electrolytic tank flow field CFD two-phase flow coupling heat transfer simulation model.
2. The numerical simulation method of the AEM electrolyzer flow field according to claim 1, wherein the parameters of the AEM electrolyzer three-dimensional model specifically include flow field width, flow field height, diffusion layer width, diffusion layer thickness, catalytic layer thickness and anion exchange membrane thickness.
3. The numerical simulation method of an AEM cell flow field according to claim 1, wherein S2 specifically comprises: S201, carrying out grid encryption treatment on a set runner of an array bipolar plate runner in the AEM electrolytic tank three-dimensional model, and adding a boundary layer for the set runner; And S202, filling a triangular grid in the plane part of the AEM electrolytic cell three-dimensional model, and filling a trapezoidal grid in the part close to the hole so as to carry out gridding treatment on the AEM electrolytic cell three-dimensional model.
4. The numerical simulation method of the AEM cell flow field according to claim 1, wherein the setting mode of the temperature field volume average model is specifically as follows: and performing coupling calculation on the mixture density, the mixture viscosity, the mixture heat conductivity coefficient and the mixture specific heat capacity based on the relevant gas fraction and the relevant liquid fraction calculated by the two-phase flow physical field through a volume weighted average law to set the temperature field volume average model.
5. The numerical simulation method of an AEM cell flow field according to claim 4, wherein the coupling calculation of the relevant gas fraction and the relevant liquid fraction to the mixture density specifically comprises: calculating the volume fraction and the pure substance density of each phase according to the relevant gas fraction and the relevant liquid fraction; multiplying the volume fraction and the pure substance density to obtain a plurality of mixture density product terms; and summing a plurality of mixture density product terms to obtain the mixture density.
6. The numerical simulation method of an AEM cell flow field according to claim 4, characterized in that the coupling calculation of the relevant gas fraction and the relevant liquid fraction to the mixture viscosity specifically comprises: calculating the volume fraction and the pure substance viscosity of each phase according to the relevant gas fraction and the relevant liquid fraction; multiplying the volume fraction and the viscosity of the pure substance to obtain a plurality of mixture viscosity product terms; And summing a plurality of mixture viscosity product terms to obtain the mixture viscosity.
7. The numerical simulation method of an AEM cell flow field according to claim 4, wherein the calculation of the coupling of the relevant gas fraction and the relevant liquid fraction to the thermal conductivity of the mixture specifically comprises: Calculating the volume fraction of each phase and the heat conductivity coefficient of the pure substance according to the relevant gas fraction and the relevant liquid fraction; multiplying the volume fraction by the pure substance thermal conductivity to obtain a plurality of mixture thermal conductivity product terms; And summing a plurality of product terms of the heat conductivity coefficients of the mixture to obtain the heat conductivity coefficients of the mixture.
8. The numerical simulation method of an AEM cell flow field according to claim 4, characterized in that the coupling calculation of the relative gas fraction and the relative liquid fraction to the specific heat capacity of the mixture specifically comprises: calculating the volume fraction, the pure substance density and the specific heat capacity of each phase according to the relevant gas fraction and the relevant liquid fraction; multiplying the volume fraction, the pure substance density and the specific heat capacity to obtain a plurality of mixture specific heat capacity product terms; Summing a plurality of said mixture specific heat capacity product terms; based on the ratio of the sum and the mixture density, the mixture specific heat capacity is obtained.
9. The numerical simulation method of an AEM cell flow field according to claim 1, wherein S4 is specifically: Based on the electrochemical mass source item, the bubble motion volume force source item and the temperature field volume average model, a double Euler two-phase flow model is adopted, liquid water is set as a main phase, oxygen is set as a secondary phase, and the AEM electrolytic tank flow field CFD two-phase flow coupling heat transfer simulation model is constructed.
10. A numerical simulation system of an AEM electrolytic tank flow field is characterized by comprising a processor and a memory; The memory stores a program or instructions executable on the processor which when executed by the processor performs the steps of the numerical simulation method of an AEM cell flow field according to any of claims 1 to 9.

Description

Numerical simulation method and system for AEM electrolytic tank flow field Technical Field The invention relates to the technical field of AEM electrolytic tanks, in particular to a numerical simulation method and a numerical simulation system for a flow field of an AEM electrolytic tank. Background Green hydrogen is used as a core carrier of a clean energy system under the drive of a double-carbon target, and the large-scale preparation technology becomes a research hot spot in the field of new energy. The Anion Exchange Membrane (AEM) electrolyzer has the advantages of low cost, strong working condition adaptability, compatibility with non-noble metal catalysts and the like, and is regarded as a new generation green hydrogen preparation core device for replacing the traditional alkaline electrolyzer and Proton Exchange Membrane (PEM) electrolyzer. At present, a conventional CFD two-phase flow analysis method is mainly adopted for numerical simulation of an AEM electrolytic tank flow field in the prior art, a general flow is to construct an electrolytic tank geometric simplified model, global uniform gridding treatment is carried out on a model calculation domain, an electrochemical related source term and interphase acting force parameter are set by adopting an empirical formula, coupling simulation calculation of the flow field and a temperature field is carried out on the basis of a traditional two-phase flow model, and finally, preliminary evaluation is carried out on an electrolytic tank flow channel structure according to a simulation result, so that basic reference is provided for subsequent research and development. Meanwhile, the gridding treatment adopts a globally uniform dividing mode, does not carry out differential optimization on a key region with severe bubble generation and flow field change in the electrolytic tank, is difficult to accurately capture microscopic characteristics such as flow velocity gradient, temperature gradient and the like of the region, and further reduces the calculation precision of gas-liquid two-phase flow coupling heat transfer simulation. Disclosure of Invention In view of the shortcomings of the prior art, the invention aims to provide a numerical simulation method of an AEM electrolytic tank flow field, which can solve the technical problems that the existing three-dimensional model in the prior art is excessively idealized and simplified, the real space configuration and structural characteristics of the electrolytic tank core component are not completely restored, only basic outline is reserved, the matching degree of the model and the actual electrolytic tank is low, the reliability of the subsequent simulation result is directly affected, meanwhile, the gridding treatment adopts a globally uniform dividing mode, differential optimization is not carried out on the key region with severe bubble generation and flow field change in the electrolytic tank, microscopic characteristics such as flow velocity gradient and temperature gradient of the region are difficult to accurately capture, and the calculation accuracy of gas-liquid phase flow two-coupling heat transfer simulation is further reduced. In a first aspect of the embodiment of the present invention, a numerical simulation method for an AEM electrolytic cell flow field is provided, including: S1, constructing an AEM electrolytic cell three-dimensional model; s2, performing gridding treatment on the AEM electrolytic cell three-dimensional model; s3, setting an electrochemical mass source item, a bubble motion volume force source item and a temperature field volume average model on the basis of the AEM electrolytic tank three-dimensional model after gridding treatment; S4, constructing an AEM electrolytic tank flow field CFD two-phase flow coupling heat transfer simulation model based on an electrochemical mass source item, a bubble motion volume force source item and a temperature field volume average model; s5, simulating the numerical value of the AEM electrolytic tank flow field through the AEM electrolytic tank flow field CFD two-phase flow coupling heat transfer simulation model. In a second aspect of the embodiment of the invention, a numerical simulation system of an AEM electrolytic tank flow field is provided, which comprises a processor and a memory; the memory stores a program or instructions executable on the processor which when executed by the processor implement the steps of the numerical simulation method of an AEM cell flow field according to the first aspect. The technical scheme provided by the embodiment of the invention has the beneficial effects that at least: According to the embodiment of the invention, the space configuration and the structural characteristics of the core component of the electrolytic tank can be reproduced by constructing the AEM electrolytic tank three-dimensional model, the geometric matching degree of the model and the actual electrolytic tank is remarkably