Simulation modeling method of natural uranium extraction and purification system

Abstract

The invention belongs to the technical field of extraction and purification of natural uranium in nuclear fuel circulation, and particularly relates to a simulation modeling method of a natural uranium extraction and purification system. Determining parameter types of the extraction and purification system, and dividing the parameter types into process operation parameters and pulse column structure parameters; technological operation parameters are used as input operation variables, and pulse column structure parameters are used as fixed quantities; respectively establishing mass transfer models of an extraction column, a washing column and a reverse extraction column in the extraction and purification system by a unit differential method; carrying out nondimensionalization on the mass transfer model; solving the dimensionless mass transfer model, establishing a thermodynamic model and a hydraulic model of a pulse column in the uranyl nitrate extraction and purification process, and combining the thermodynamic model and the hydraulic model, namely combining the extraction reaction process and the pulse column structure characteristics used in the extraction reaction process. The operation result of the natural uranium extraction and purification process can be truly simulated, and the operation results under different two-phase flow ratios, concentrations, acidity and temperatures can be simulated and calculated.

Description

technical field [0001] The invention belongs to the technical field of extraction and purification of natural uranium in nuclear fuel cycle, in particular to a simulation modeling method of a natural uranium extraction and purification system. Background technique [0002] With the development of industrial intelligence and the proposal of Industry 4.0, intelligence has become a trend. The extraction and purification of natural uranium concentrate is an important part of the nuclear fuel cycle. In the process, the metal impurities in the uranyl nitrate solution are removed through the extraction-washing-stripping process to ensure the quality of the back-end products. The process has many reaction mechanisms and complex process operations. In order to avoid material leakage and nuclear accidents, the change of process conditions is strictly controlled, and exploratory experiments cannot be carried out to explore the limit conditions of the extraction system. [0003] At pre...

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Problems solved by technology

The process has many reaction mechanisms and complex process operations. In order to avoid material leakage and nuclear accidents, the change of process conditions is strictly controlled, and exploratory experiments cannot be carried out to explore the limit conditions of the extraction system.

[0003] At present, there is no relevant report that can establish a set of accurate mathematical models to simulate the operation of industrial-grade extraction columns. The existing extraction column modeling is generally theoretical modeling, rather than model building for real industrial-grade extraction columns. The accuracy is poor, which is quite different from the operation results of the extraction column in industrial applications, and has poor guidance for actual production

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