Multi-scale modeling and calculating method for aluminum electrolysis aluminum oxide particle dissolving process

Abstract

The invention discloses a multi-scale modeling and calculating method for an aluminum electrolysis aluminum oxide particle dissolving process. The method comprises the following steps that a three-dimensional calculation geometric model of a certain industrial aluminum electrolysis cell is established and mesh generation is carried out; a mesoscale mathematical model for accurately describing bubble coalescence and breaking behaviors in a aluminum electrolysis cell melt is established; three-dimensional space gas-liquid interphase acting force data borne by the melt in the aluminum electrolysis cell is precisely exported, and coupling and nesting treatment are carried out on the three-dimensional space data of the electromagnetic force and the gas-liquid interphase acting force borne by the melt; and a multi-scale liquid-solid two-phase flow model for describing the dissolution process of alumina particles in the aluminum electrolysis cell is constructed, and multi-phase flow, multi-physical field action, interphase heat and mass transfer, alumina particle ball shrinkage behaviors and the like are coupled. The method can accurately calculate and predict the dissolution behavior ofthe aluminum oxide particles in the large industrial aluminum electrolysis cell, has good applicability and generalization performance, is beneficial to scientifically guiding the optimal design of the industrial aluminum electrolysis aluminum oxide feeding process, and provides theoretical guidance for the efficient and stable production of the actual aluminum electrolysis cell.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation of aluminum electrolysis multiphase flow, and in particular relates to a multi-scale modeling and calculation method for the dissolution process of aluminum electrolysis alumina particles. Background technique [0002] As a typical traditional metallurgical industry with high energy consumption, high pollution and high carbon emissions, the aluminum electrolysis industry's green transformation is not only related to the realization of the country's binding goals for energy conservation and emission reduction, but also related to the transformation of the country's green economic development. Therefore, in the context of the country's advocacy of energy conservation, emission reduction and low-carbon economy, exploring and developing high-efficiency, energy-saving and environmentally friendly aluminum electrolysis technology is an important development idea and direction that needs to b...

AI Technical Summary

Problems solved by technology

At present, the relevant traditional experimental research methods still mainly focus on the qualitative analysis and description of the alumina particle dissolution process in the laboratory's extremely small-scale electrolytic cell, and it is difficult to obtain and characterize the macroscopic fluid flow, temperature field, and alumina concentration in the industrial cell. Evolution law of key field parameters such as

Related traditional simplified mathematical modeling research often ignores the dissolution behavior of actual alumina particles, and lacks an in-depth scientific and quantitative description of the dissolution and diffusion behavior of alumina particles, as well as their coupling effects and internal correlations with multiphases, multifields, etc.

Images