Construction method and construction system for multiterm flow reaction model of continuous dissolver

Abstract

The invention discloses a construction method and a construction system for a multiterm flow reaction model of a continuous dissolver, and the method comprises the following steps: dividing the continuous dissolver into at least two function modules according to functions, respectively carrying out simulation technology analysis, and establishing corresponding simulation function models; establishing a dissolution reaction mathematical model for the dissolution process of the fuel short section; carrying out overall simulation technical analysis on each simulation function model, constructing a continuous dissolver multi-flow reaction model comprising each function module, applying the dissolution reaction mathematical model to the continuous dissolver multi-flow reaction model, and simulating the dissolution process under the actual working condition to obtain the multi-flow reaction model of the continuous dissolver. And testing the stability and convergence of the multi-flow reaction model of the continuous dissolver, and adjusting the multi-flow reaction model of the continuous dissolver according to a test result until a preset standard for reflecting an actual physical and chemical process is reached. According to the method, the prediction accuracy and reliability of the multi-item flow reaction model of the continuous dissolver are improved, the cost is reduced, and the technical iteration speed is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical engineering and process simulation, and particularly relates to a construction method and a construction system for a multi-phase flow reaction model of a continuous dissolver. Background Art

[0002] As a key device in the fields of chemical engineering, metallurgy, etc., the internal dissolution, heat transfer, mass transfer, and chemical reaction processes of a continuous dissolver are extremely complex, involving the interaction of gas, liquid, and solid phases and multiple chemical components. Although traditional three-dimensional computational fluid dynamics (CFD) simulation technology can simulate fluid flow phenomena to a certain extent, when dealing with complex multiphase flow systems and chemical reaction kinetics, there are often problems such as high modeling difficulty, high consumption of computing resources, and insufficient result accuracy. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a construction method and a construction system for a multi-phase flow reaction model of a continuous dissolver in view of the above deficiencies in the prior art. By constructing a multi-level and multi-dimensional simulation model, the physical and chemical mechanisms inside the continuous dissolver can be comprehensively reflected, the accuracy and reliability of the prediction of the multi-phase flow reaction model of the continuous dissolver can be improved, the R & D cost can be reduced, and the technology iteration speed can be accelerated.

[0004] The technical solution adopted to solve the technical problem of the present invention is to provide a construction method for a multi-phase flow reaction model of a continuous dissolver, including the following steps:

[0005] Divide the continuous dissolver into at least two functional modules according to functions, respectively perform simulation technology analysis on each functional module, and establish corresponding simulation function models;

[0006] For the dissolution process of the fuel short section, establish a dissolution reaction mathematical model;

[0007] Perform overall simulation technology analysis on each simulation function model to construct a multi-phase flow reaction model of the continuous dissolver including each functional module. Apply the dissolution reaction mathematical model to the multi-phase flow reaction model of the continuous dissolver. By simulating the dissolution process under actual working conditions, test the stability and convergence of the multi-phase flow reaction model of the continuous dissolver, and adjust the multi-phase flow reaction model of the continuous dissolver according to the test results until the preset standard reflecting the actual physical and chemical process is achieved.

[0008] Preferably, the functional modules include: a gas lift device, a bottom purging device, a water seal structure, a steam heating jacket, a runner bucket, a distributor, and a liquid surface defoaming device.

[0009] Preferably, the specific steps of respectively performing simulation technology analysis on each functional module include:

[0010] Use CFD (Computational Fluid Dynamics) multiphase flow simulation technology to simulate gas-liquid-solid three-phase flow;

[0011] Adopt the DEM model (Discrete Element Model) to simulate the motion trajectories and interactions of solid particles;

[0012] Adopt the DPM model (Discrete Phase Model) to simulate the distribution process of solid particles;

[0013] For the region with gas-liquid interface fluctuations, use the VOF (Volume of Fluid) model for fine simulation.

[0014] Preferably, before separately analyzing each functional module using simulation technology, the following steps are further included:

[0015] Set the fluid physical property parameters and chemical reaction kinetics parameters in the continuous dissolver;

[0016] Initialize the boundary conditions and initial conditions of the continuous dissolver.

[0017] Preferably, after separately analyzing each functional module using simulation technology, the following steps are further included:

[0018] Evaluate the performance parameters of each functional module, and optimize the structural dimensions and operating conditions of the continuous dissolver.

[0019] Preferably, for the dissolution process of the fuel short section, the specific steps for establishing the dissolution reaction mathematical model include:

[0020] Analyze the dissolution process of the fuel short section in the solution. The dissolution process includes: wetting of the solid surface, generation and release of dissolution products, diffusion and mass transfer of gas in the liquid, and establish the corresponding primary dissolution reaction mathematical model;

[0021] Through basic experiments and pilot-scale amplification experiments, obtain the dissolution parameters during the dissolution process, and use mathematical methods to calibrate the primary dissolution reaction mathematical model to obtain the dissolution reaction mathematical model.

[0022] Preferably, for the dissolution process of the fuel short section, the specific steps for establishing the dissolution reaction mathematical model further include:

[0023] Design an experimental scheme to verify the parameters of the dissolution reaction mathematical model. By comparing and analyzing the experimental data and simulation results, evaluate the prediction accuracy and reliability of the dissolution reaction mathematical model. If the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, then determine the dissolution reaction mathematical model;

[0024] If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, the dissolution reaction mathematical model shall be corrected and improved according to the verification results.

[0025] Preferably, the dissolution parameters include: the production rate of substances in each phase state, component concentration, temperature, and contact area during the dissolution process.

[0026] Preferably, the mathematical methods include: data regression and parameter estimation.

[0027] Preferably, the specific steps for performing an overall simulation technology analysis on each simulation function model and constructing a continuous dissolver multi-phase flow reaction model including each functional module are as follows:

[0028] Based on the Eulerian multiphase flow model, perform an overall simulation technology analysis on each simulation function model and construct a continuous dissolver multi-phase flow reaction model including each functional module.

[0029] Preferably, after constructing the continuous dissolver multi-phase flow reaction model including each functional module, the following steps are further included:

[0030] Adopt a combination of multiple models such as the VOF (Volume of Fluid) model, DPM model, and DEM model to simulate the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver.

[0031] The VOF model, DPM model, and DEM model are specific applications and supplements of the Eulerian multiphase flow model in simulating the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver.

[0032] The Eulerian multiphase flow model is a model based on the Eulerian view, used to describe the flow of multiphase flow in a continuous medium and provide a basic framework for dealing with multiphase flow.

[0033] The VOF model is mainly used to simulate the region of gas-liquid interface fluctuations and can finely reflect the interface changes.

[0034] The DPM model is used to simulate the distribution process of solid particles and focuses on the movement and distribution of particles in the fluid.

[0035] The DEM model is used to simulate the movement trajectories and interactions of solid particles and is used for particle collisions and contacts.

[0036] The four models cooperate with each other to jointly simulate the feeding, discharging, and physicochemical processes of the continuous dissolver.

[0037] Preferably, after simulating the multiphase flow, heat and mass transfer, and chemical reaction processes in a continuous dissolver by combining multiple models such as the VOF model, DPM model, and DEM model, the following steps are further included:

[0038] Couple the transient time steps between the DEM model and the CFD multiphase flow simulation technology. Within each time step, first calculate the fluid flow situation by the CFD multiphase flow simulation technology, then transfer the flow field data of the CFD multiphase flow simulation technology to the DEM model. Calculate the movement trajectories of solid particles and the interactions between phases by the DEM model. Subsequently, introduce the interactions between phases calculated by the DEM model into the control equations of the CFD multiphase flow simulation technology in the form of source terms to achieve the dynamic interaction between the fluid and the particles. Repeat the above steps until the preset simulation time is reached or the convergence condition is satisfied.

[0039] Preferably, after testing the stability and convergence of the multiphase flow reaction model of the continuous dissolver by simulating the dissolution process under actual working conditions, the following steps are further included:

[0040] Compare and analyze the fluid flow pattern, temperature distribution, and concentration gradient characteristics in the simulation results with the experimental data to evaluate the prediction accuracy and reliability of the multiphase flow reaction model of the continuous dissolver. If the prediction accuracy and reliability of the multiphase flow reaction model of the continuous dissolver meet the preset requirements, determine the multiphase flow reaction model of the continuous dissolver;

[0041] If the prediction accuracy and reliability of the multiphase flow reaction model of the continuous dissolver do not meet the preset requirements, optimize and adjust the multiphase flow reaction model of the continuous dissolver according to the verification results.

[0042] The present invention also provides a construction system used for the construction method of the above-mentioned multiphase flow reaction model of the continuous dissolver, including:

[0043] A simulation function model establishment unit divides the continuous dissolver into at least two function modules according to functions, conducts simulation technology analysis on each function module respectively, establishes corresponding simulation function models, and sends them to the multiphase flow reaction model establishment unit of the continuous dissolver;

[0044] A dissolution reaction mathematical model establishment unit establishes a dissolution reaction mathematical model for the dissolution process of the fuel short section and sends it to the multiphase flow reaction model establishment unit of the continuous dissolver;

[0045] A unit for establishing a multi-phase flow reaction model of a continuous dissolver conducts an overall simulation technology analysis on each simulation function model, constructs a multi-phase flow reaction model of the continuous dissolver including each functional module, applies the dissolution reaction mathematical model to the multi-phase flow reaction model of the continuous dissolver, tests the stability and convergence of the multi-phase flow reaction model of the continuous dissolver by simulating the dissolution process under actual working conditions, and adjusts the multi-phase flow reaction model of the continuous dissolver according to the test results until the preset standard reflecting the actual physical and chemical process is achieved.

[0046] Preferably, the functional modules include: a gas lift device, a bottom purging device, a water seal structure, a steam heating jacket, a runner bucket, a distributor, and a liquid surface defoaming device.

[0047] Preferably, the simulation function model establishment unit includes:

[0048] A first simulation unit that simulates the gas-liquid-solid three-phase flow using CFD multiphase flow simulation technology;

[0049] A second simulation unit that uses the DEM model to simulate the movement trajectories and interactions of solid particles;

[0050] A third simulation unit that uses the DPM model to simulate the distribution process of solid particles;

[0051] A fourth simulation unit that uses the VOF model for fine simulation of the region with gas-liquid interface fluctuations.

[0052] Preferably, the simulation function model establishment unit further includes:

[0053] A parameter setting unit that sets the fluid physical property parameters and chemical reaction kinetic parameters inside the continuous dissolver and sends them to the simulation function model establishment unit;

[0054] An initialization unit that initializes the boundary conditions and initial conditions of the continuous dissolver and sends them to the simulation function model establishment unit.

[0055] Preferably, the simulation function model establishment unit further includes:

[0056] A simulation function model optimization unit that optimizes the structural dimensions and operating conditions of the continuous dissolver according to the performance parameters of each functional module sent by the simulation function model establishment unit.

[0057] Preferably, the dissolution reaction mathematical model establishment unit includes:

[0058] A primary dissolution reaction mathematical model establishment unit that analyzes the dissolution process of the fuel short section in the solution. The dissolution process includes: wetting of the solid surface, generation and release of dissolution products, and diffusion and mass transfer of gas in the liquid. A corresponding primary dissolution reaction mathematical model is established and sent to the calibration unit;

[0059] The calibration unit obtains the dissolution parameters during the dissolution process through basic experiments and pilot-scale amplification experiments, and uses mathematical methods to calibrate the primary dissolution reaction mathematical model to obtain the dissolution reaction mathematical model.

[0060] Preferably, the dissolution reaction mathematical model establishment unit further includes:

[0061] The verification unit designs an experimental scheme to verify the parameters of the dissolution reaction mathematical model. By comparing and analyzing the experimental data and simulation results, it evaluates the prediction accuracy and reliability of the dissolution reaction mathematical model. If the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, the dissolution reaction mathematical model is determined;

[0062] If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, the dissolution reaction mathematical model is corrected and improved according to the verification results.

[0063] Preferably, the dissolution parameters include: the production rate, component concentration, temperature, and contact area of each phase substance during the dissolution process.

[0064] Preferably, the mathematical methods include: data regression and parameter estimation.

[0065] Preferably, the continuous dissolver multiphase flow reaction model establishment unit includes:

[0066] The overall model construction unit, based on the Eulerian multiphase flow model, conducts an overall simulation technology analysis on each simulation functional model, and constructs a continuous dissolver multiphase flow reaction model including each functional module.

[0067] Preferably, the continuous dissolver multiphase flow reaction model establishment unit includes:

[0068] The coupling calculation unit combines multiple models such as the VOF model, DPM model, and DEM model to simulate the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver.

[0069] Preferably, the coupling calculation unit is also used to couple the transient time steps between the DEM model and the CFD multiphase flow simulation technology. In each time step, first, the CFD multiphase flow simulation technology calculates the fluid flow situation, and then the CFD multiphase flow simulation technology flow field data is transmitted to the DEM model. The DEM model calculates the motion trajectory and interphase interaction of solid particles. Subsequently, the interphase interaction calculated by the DEM model is introduced into the CFD multiphase flow simulation technology control equation in the form of a source term to achieve the dynamic interaction between the fluid and the particles. Repeat the above steps until the preset simulation time is reached or the convergence condition is satisfied.

[0070] Preferably, the continuous dissolver multi-phase flow reaction model establishment unit includes:

[0071] An evaluation unit that compares and analyzes the fluid flow pattern, temperature distribution, and concentration gradient characteristics in the simulation results with the experimental data, evaluates the prediction accuracy and reliability of the continuous dissolver multi-phase flow reaction model. If the prediction accuracy and reliability of the continuous dissolver multi-phase flow reaction model meet the preset requirements, the continuous dissolver multi-phase flow reaction model is determined;

[0072] If the prediction accuracy and reliability of the continuous dissolver multi-phase flow reaction model do not meet the preset requirements, the continuous dissolver multi-phase flow reaction model is optimized and adjusted according to the verification results.

[0073] The construction method and system of the continuous dissolver multi-phase flow reaction model in the present invention can efficiently and accurately simulate the multi-phase flow reaction process in the continuous dissolver.

[0074] The construction method of the continuous dissolver multi-phase flow reaction model in the present invention is a comprehensive modeling and calculation method for the complex physical and chemical processes in the continuous dissolver, especially the multi-phase flow reaction process. This method integrates advanced means such as computational fluid dynamics (CFD multi-phase flow simulation technology), discrete element simulation (DEM model), multi-phase flow simulation technology, experimental data calibration and verification technology, etc., aiming to achieve a full-scale and high-precision simulation of the continuous dissolver from microscopic particle motion to macroscopic fluid behavior, providing a scientific basis and technical support for the design optimization, performance evaluation, and industrial application of the continuous dissolver.

[0075] The beneficial effects of the construction method and system of the continuous dissolver multi-phase flow reaction model in the present invention are as follows:

[0076] (1) Improve the prediction accuracy of the continuous dissolver multi-phase flow reaction model: By integrating multiple simulation technologies, a comprehensive simulation of the multi-phase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver is realized, significantly improving the prediction accuracy and reliability of the continuous dissolver multi-phase flow reaction model.

[0077] (2) Reduce R & D costs: Through experimental design optimization and model verification, the number of blind experiments and pilot tests is reduced, and the R & D costs and time investment are reduced. Brief Description of the Drawings

[0078] Figure 1 is a flowchart of the construction method of the continuous dissolver multi-phase flow reaction model in Embodiment 1 of the present invention;

[0079] Figure 2 is a schematic structural diagram of the construction system used in the construction method of the continuous dissolver multi-phase flow reaction model in Embodiment 1 of the present invention;

[0080] Figure 3 It is a schematic diagram of the functional structure of the continuous dissolver in Embodiment 2 of the present invention.

[0081] In the figure: 1 - gas lift device, 2 - bottom purging device, 3 - water seal structure, 4 - steam heating jacket, 5 - runner bucket, 6 - distributor, 7 - liquid surface defoaming device. Specific embodiments

[0082] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0083] Embodiment 1

[0084] As Figure 1 shown, this embodiment provides a method for constructing a multi-phase flow reaction model of a continuous dissolver, including the following steps:

[0085] S1 Divide the continuous dissolver into at least two functional modules according to functions, perform simulation technology analysis on each functional module respectively, and establish corresponding simulation functional models;

[0086] S2 Establish a dissolution reaction mathematical model for the dissolution process of the fuel short section;

[0087] S3 Perform overall simulation technology analysis on each simulation functional model to construct a multi-phase flow reaction model of the continuous dissolver including each functional module, use the dissolution reaction mathematical model for the multi-phase flow reaction model of the continuous dissolver, test the stability and convergence of the multi-phase flow reaction model of the continuous dissolver by simulating the dissolution process under actual working conditions, and adjust the multi-phase flow reaction model of the continuous dissolver according to the test results until the preset standard reflecting the actual physical and chemical process is reached.

[0088] As Figure 2 shown, this embodiment also provides a construction system used for the above method for constructing a multi-phase flow reaction model of a continuous dissolver, including:

[0089] A simulation functional model establishment unit divides the continuous dissolver into at least two functional modules according to functions, performs simulation technology analysis on each functional module respectively, establishes corresponding simulation functional models, and sends them to the multi-phase flow reaction model establishment unit of the continuous dissolver;

[0090] A dissolution reaction mathematical model establishment unit establishes a dissolution reaction mathematical model for the dissolution process of the fuel short section and sends it to the multi-phase flow reaction model establishment unit of the continuous dissolver;

[0091] A unit for establishing a multi-phase flow reaction model of a continuous dissolver analyzes the overall simulation technology of each simulation function model, constructs a multi-phase flow reaction model of the continuous dissolver including each functional module, applies the dissolution reaction mathematical model to the multi-phase flow reaction model of the continuous dissolver, tests the stability and convergence of the multi-phase flow reaction model of the continuous dissolver by simulating the dissolution process under actual working conditions, and adjusts the multi-phase flow reaction model of the continuous dissolver according to the test results until the preset standard reflecting the actual physical and chemical process is achieved.

[0092] The beneficial effects of the method and system for constructing the multi-phase flow reaction model of the continuous dissolver in this embodiment are as follows:

[0093] (1) Improve the prediction accuracy of the multi-phase flow reaction model of the continuous dissolver: By integrating various simulation technologies, a comprehensive simulation of the multi-phase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver is realized, significantly improving the prediction accuracy and reliability of the multi-phase flow reaction model of the continuous dissolver.

[0094] (2) Reduce R & D costs: Through experimental design optimization and model verification, the number of blind experiments and pilot tests is reduced, and the R & D costs and time investment are reduced.

[0095] Embodiment 2

[0096] This embodiment provides a method for constructing a multi-phase flow reaction model of a continuous dissolver, including the following steps:

[0097] Divide the continuous dissolver into at least two functional modules according to functions, analyze the simulation technology of each functional module respectively, and establish corresponding simulation function models;

[0098] Establish a dissolution reaction mathematical model for the dissolution process of the fuel short section;

[0099] Analyze the overall simulation technology of each simulation function model, construct a multi-phase flow reaction model of the continuous dissolver including each functional module, apply the dissolution reaction mathematical model to the multi-phase flow reaction model of the continuous dissolver, test the stability and convergence of the multi-phase flow reaction model of the continuous dissolver by simulating the dissolution process under actual working conditions, and adjust the multi-phase flow reaction model of the continuous dissolver according to the test results until the preset standard reflecting the actual physical and chemical process is achieved. This step is a multi-disciplinary coupling simulation of the three-dimensional gas-liquid-solid multi-phase multi-component flow heat and mass transfer process.

[0100] Preferably, the functional modules include: a gas lift device, a bottom purging device, a water seal structure, a steam heating jacket, a runner bucket, a distributor, and a liquid surface defoaming device. Specifically, the functional modules are divided into the above-mentioned multiple key functional modules, such as Figure 3As shown, the continuous dissolver includes the above-mentioned multiple key functional modules, that is, the continuous dissolver includes: a gas lift device 1, a bottom purging device 2, a water seal structure 3, a steam heating jacket 4, a rotating wheel bucket 5, a distributor 6, and a liquid surface defoaming device 7, but is not limited to the above functional modules. These functional modules each undertake specific physical or chemical functions and have an important impact on the dissolving process.

[0101] The continuous dissolver includes: a continuous dissolver solid tank. The gas lift device 1, the bottom purging device 2, the water seal structure 3, the rotating wheel bucket 5, the distributor 6, and the liquid surface defoaming device 7 are arranged in the continuous dissolver solid tank. The continuous dissolver solid tank is used to add solid materials and solvents, and the solid materials are dissolved in the solvents. The steam heating jacket 4 is arranged outside the continuous dissolver solid tank, and the steam heating jacket 4 is used to heat the continuous dissolver solid tank. The bottom purging device 2 is used to purge the materials at the bottom of the continuous dissolver solid tank.

[0102] The rotating wheel bucket 5 inside the continuous dissolver can rotate step by step. The solid materials enter the rotating wheel bucket 5 from the central distributor 6. As the rotating wheel rotates to the discharging position, the solid materials enter the distributor 6 from the rotating wheel bucket 5 and are discharged from the continuous dissolver. The rotating wheel bucket 5 can be separated from the continuous dissolver solid tank, and the atmosphere sealing function is realized by the water seal structure 3. A liquid surface defoaming device 7 is arranged in the middle of the solid tank, and the liquid surface defoaming device 7 is used to prevent a large amount of foam from generating during the reaction process. A gas lift device 1 is arranged inside the continuous dissolver to lift, collect, and discharge the residues deposited at the bottom of the tank from the continuous dissolver.

[0103] Preferably, the specific steps for separately performing simulation technology analysis on each functional module include:

[0104] Using CFD multiphase flow simulation technology to simulate the three-phase flow of gas, liquid, and solid;

[0105] Adopting the DEM model to simulate the movement trajectories and interactions of solid particles;

[0106] Adopting the DPM model to simulate the distribution process of solid particles;

[0107] For the region with gas-liquid interface fluctuations, the VOF model is used for fine simulation.

[0108] Specifically, for the region with large gas-liquid interface fluctuations, such as the top water seal structure, the VOF model can be used for fine simulation.

[0109] The selection of simulation technology is based on the characteristics of each functional module, and a suitable simulation technology is adopted for simulation.

[0110] Preferably, before the above steps of separately performing simulation technology analysis on each functional module, the following steps are further included:

[0111] Set the physical property parameters and chemical reaction kinetic parameters of the fluid in the continuous dissolver.

[0112] Initialize the boundary conditions and initial conditions of the continuous dissolver.

[0113] Preferably, after performing simulation technology analysis on each functional module respectively, the following steps are further included:

[0114] Evaluate the performance parameters of each functional module, and optimize the structural dimensions and operating conditions of the continuous dissolver.

[0115] Specifically, the equipment performance optimization is to evaluate the performance parameters of each functional module, such as flow field distribution, temperature gradient, mass transfer efficiency, etc., through simulation analysis, and combine design experience and actual constraints to optimize the structural dimensions and operating conditions of the equipment and improve the overall performance.

[0116] Preferably, for the dissolution process of the fuel short section, the specific steps for establishing the dissolution reaction mathematical model include:

[0117] Analyze the dissolution process of the fuel short section in the solution. The dissolution process includes: wetting of the solid surface, generation and release of dissolution products, diffusion and mass transfer of gas in the liquid, and establish the corresponding primary dissolution reaction mathematical model; this step of the analysis process is an in-depth analysis process and is a physical and chemical mechanism analysis.

[0118] Through basic experiments and pilot-scale amplification experiments, obtain the dissolution parameters during the dissolution process, and use mathematical methods to calibrate the primary dissolution reaction mathematical model to obtain the dissolution reaction mathematical model.

[0119] Preferably, for the dissolution process of the fuel short section, the specific steps for establishing the dissolution reaction mathematical model further include:

[0120] Design an experimental design (ED) scheme to verify the parameters of the dissolution reaction mathematical model. By comparing and analyzing the experimental data and simulation results, evaluate the prediction accuracy and reliability of the dissolution reaction mathematical model. If the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, then determine the dissolution reaction mathematical model;

[0121] If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, modify and improve the dissolution reaction mathematical model according to the verification results.

[0122] Preferably, the dissolution parameters include: the production rate, component concentration, temperature, and contact area of each phase substance during the dissolution process.

[0123] Preferably, the mathematical methods include: data regression and parameter estimation.

[0124] Specifically, parameter calibration is to obtain key parameters such as the production rate, component concentration, temperature, and contact area of substances in each phase state during the dissolution process through a large number of basic experiments and pilot-scale amplification experiments. By using methods such as data regression and parameter estimation, the mathematical model of the primary dissolution reaction is calibrated to ensure that the mathematical model of the primary dissolution reaction can accurately reflect the actual physicochemical process.

[0125] Specifically, the verification of the dissolution reaction mathematical model is to design a reasonable experimental design (ED) scheme to verify the parameters of the dissolution reaction mathematical model. By comparing and analyzing the experimental data and simulation results, if the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, the dissolution reaction mathematical model is determined;

[0126] If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, the dissolution reaction mathematical model is corrected and improved as necessary according to the verification results.

[0127] Preferably, the specific steps of the step of performing an overall simulation technology analysis on each simulation function model and constructing a continuous dissolver multi-phase flow reaction model including each functional module are as follows:

[0128] Based on the Eulerian multiphase flow model, an overall simulation technology analysis is performed on each simulation function model to construct a continuous dissolver multi-phase flow reaction model including each functional module.

[0129] Preferably, after the step of constructing a continuous dissolver multi-phase flow reaction model including each functional module, the following steps are further included:

[0130] A combination of multiple models such as the VOF model, DPM model, and DEM model is used to simulate the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver.

[0131] Specifically, the overall model construction is based on the Eulerian multiphase flow model to construct an overall simulation model including the equipment of each functional module of the continuous dissolver. A combination of multiple models such as the VOF model, DPM model, and DEM model is used to comprehensively simulate the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver.

[0132] The VOF model, DPM model, and DEM model are specific applications and supplements of the Eulerian multiphase flow model in simulating the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver.

[0133] The Eulerian multiphase flow model is a model based on the Eulerian view, used to describe the flow of multiphase flow in a continuous medium, and provides a basic framework for dealing with multiphase flow.

[0134] The VOF model is mainly used to simulate the area of gas-liquid interface fluctuations and can precisely reflect the interface changes.

[0135] The DPM model is used to simulate the distribution process of solid particles and focuses on the movement and distribution of particles in the fluid.

[0136] The DEM model is used to simulate the movement trajectories and interactions of solid particles and is used for particle collisions and contacts.

[0137] The four models cooperate with each other to jointly simulate the feeding, discharging, and physicochemical processes of the continuous dissolver.

[0138] Preferably, after the steps of using a combination of the VOF model, DPM model, and DEM model to simulate the multiphase flow, heat transfer, mass transfer, and chemical reaction processes in the continuous dissolver, the following steps are further included:

[0139] Coupled calculation is to couple the transient time steps between the DEM model and the CFD multiphase flow simulation technology. In each time step, first, the CFD multiphase flow simulation technology calculates the fluid flow situation, and then the flow field data of the CFD multiphase flow simulation technology is transmitted to the DEM model. The DEM model calculates the movement trajectories and interphase interactions of solid particles. Subsequently, the interphase interactions calculated by the DEM model are introduced into the control equation of the CFD multiphase flow simulation technology in the form of source terms to achieve the dynamic interaction between the fluid and particles. Repeat the above steps until the preset simulation time is reached or the convergence condition is satisfied.

[0140] Preferably, after the steps of testing the stability and convergence of the multiphase flow reaction model of the continuous dissolver by simulating the dissolution process under actual working conditions, the following steps are further included:

[0141] Compare and analyze the fluid flow pattern, temperature distribution, and concentration gradient characteristics in the simulation results with the experimental data to evaluate the prediction accuracy and reliability of the multiphase flow reaction model of the continuous dissolver. If the prediction accuracy and reliability of the multiphase flow reaction model of the continuous dissolver reach the preset requirements, then determine the multiphase flow reaction model of the continuous dissolver;

[0142] If the prediction accuracy and reliability of the multiphase flow reaction model of the continuous dissolver do not reach the preset requirements, optimize and adjust the multiphase flow reaction model of the continuous dissolver according to the verification results.

[0143] Specifically, model testing and optimization utilize the calibrated and verified dissolution reaction mathematical model to develop a multiphase flow reaction model of the continuous dissolver for interphase heat transfer and mass transfer in three-dimensional fluid calculations. By testing the stability and convergence of the multiphase flow reaction model of the continuous dissolver, ensure that the model can operate stably in actual applications and accurately predict the dissolution process. At the same time, make necessary optimization and adjustment to the multiphase flow reaction model of the continuous dissolver according to the test results.

[0144] This embodiment also provides a construction system used for the construction method of the continuous dissolver multi-phase flow reaction model described above, including:

[0145] A simulation function model establishment unit divides the continuous dissolver into at least two function modules according to functions, conducts simulation technology analysis on each function module respectively, establishes corresponding simulation function models, and sends them to the continuous dissolver multi-phase flow reaction model establishment unit;

[0146] A dissolution reaction mathematical model establishment unit establishes a dissolution reaction mathematical model for the dissolution process of the fuel short section and sends it to the continuous dissolver multi-phase flow reaction model establishment unit;

[0147] The continuous dissolver multi-phase flow reaction model establishment unit conducts overall simulation technology analysis on each simulation function model, constructs a continuous dissolver multi-phase flow reaction model including each function module, uses the dissolution reaction mathematical model for the continuous dissolver multi-phase flow reaction model, tests the stability and convergence of the continuous dissolver multi-phase flow reaction model by simulating the dissolution process under actual working conditions, and adjusts the continuous dissolver multi-phase flow reaction model according to the test results until it meets the preset standard reflecting the actual physical and chemical process.

[0148] Preferably, the function modules include: a gas lift device, a bottom purging device, a water seal structure, a steam heating jacket, a runner bucket, a distributor, and a liquid surface defoaming device.

[0149] Preferably, the simulation function model establishment unit includes:

[0150] A first simulation unit uses CFD multiphase flow simulation technology to simulate the gas-liquid-solid three-phase flow;

[0151] A second simulation unit uses the DEM model to simulate the movement trajectories and interactions of solid particles;

[0152] A third simulation unit uses the DPM model to simulate the distribution process of solid particles;

[0153] A fourth simulation unit conducts fine simulation on the area with gas-liquid interface fluctuations using the VOF model.

[0154] Preferably, the simulation function model establishment unit further includes:

[0155] A parameter setting unit sets the fluid physical property parameters and chemical reaction kinetic parameters in the continuous dissolver and sends them to the simulation function model establishment unit;

[0156] An initialization unit initializes the boundary conditions and initial conditions of the continuous dissolver and sends them to the simulation function model establishment unit.

[0157] Preferably, the simulation function model establishment unit further includes:

[0158] A simulation function model optimization unit, which optimizes the structural dimensions and operating conditions of the continuous dissolver according to the performance parameters of each functional module sent by the received simulation function model establishment unit.

[0159] Preferably, the dissolution reaction mathematical model establishment unit includes:

[0160] A primary dissolution reaction mathematical model establishment unit, which analyzes the dissolution process of the fuel short section in the solution. The dissolution process includes: wetting of the solid surface, generation and release of dissolution products, diffusion and mass transfer of gas in the liquid, establishes the corresponding primary dissolution reaction mathematical model, and sends it to the calibration unit;

[0161] A calibration unit, which obtains the dissolution parameters during the dissolution process through basic experiments and pilot-scale amplification experiments, and uses mathematical methods to calibrate the primary dissolution reaction mathematical model to obtain the dissolution reaction mathematical model.

[0162] Preferably, the dissolution reaction mathematical model establishment unit further includes:

[0163] A verification unit, which designs an experimental design (ED) scheme to verify the parameters of the dissolution reaction mathematical model. By comparing and analyzing the experimental data and simulation results, it evaluates the prediction accuracy and reliability of the dissolution reaction mathematical model. If the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, the dissolution reaction mathematical model is determined;

[0164] If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, the dissolution reaction mathematical model is corrected and improved as necessary according to the verification results.

[0165] Preferably, the dissolution parameters include: the production rate, component concentration, temperature, and contact area of each phase substance during the dissolution process.

[0166] Preferably, the mathematical methods include: data regression and parameter estimation.

[0167] Preferably, the continuous dissolver multi-phase flow reaction model establishment unit includes:

[0168] An overall model construction unit, which based on the Eulerian multi-phase flow model, conducts an overall simulation technology analysis on each simulation function model, and constructs a continuous dissolver multi-phase flow reaction model including each functional module.

[0169] Preferably, the continuous dissolver multi-phase flow reaction model establishment unit includes:

[0170] The coupled calculation unit combines multiple models such as the VOF model, DPM model, and DEM model to simulate the multiphase flow, heat and mass transfer, and chemical reaction processes in a continuous dissolver.

[0171] Preferably, the coupled calculation unit is also used to couple the transient time steps between the DEM model and the CFD multiphase flow simulation technology. Within each time step, first, the CFD multiphase flow simulation technology calculates the fluid flow situation, and then the flow field data of the CFD multiphase flow simulation technology is transmitted to the DEM model. The DEM model calculates the motion trajectories of solid particles and the interphase interactions. Subsequently, the interphase interactions calculated by the DEM model are introduced into the control equation of the CFD multiphase flow simulation technology in the form of source terms to achieve the dynamic interaction between the fluid and the particles. Repeat the above steps until the preset simulation time is reached or the convergence condition is satisfied.

[0172] Preferably, the continuous dissolver multiphase flow reaction model establishment unit includes:

[0173] An evaluation unit compares and analyzes the fluid flow pattern, temperature distribution, and concentration gradient characteristics in the simulation results with the experimental data to evaluate the prediction accuracy and reliability of the continuous dissolver multiphase flow reaction model. If the prediction accuracy and reliability of the continuous dissolver multiphase flow reaction model meet the preset requirements, the continuous dissolver multiphase flow reaction model is determined.

[0174] If the prediction accuracy and reliability of the continuous dissolver multiphase flow reaction model do not meet the preset requirements, the continuous dissolver multiphase flow reaction model is optimized and adjusted according to the verification results.

[0175] The construction method of the continuous dissolver multiphase flow reaction model in this embodiment is a comprehensive modeling and calculation method for the complex physical and chemical processes, especially the multiphase flow reaction process, in a continuous dissolver. This method integrates advanced means such as computational fluid dynamics (CFD multiphase flow simulation technology), discrete element simulation (DEM model), multiphase flow simulation technology, and experimental data calibration and verification technology, aiming to achieve a full-scale and high-precision simulation of the continuous dissolver from microscopic particle motion to macroscopic fluid behavior, providing a scientific basis and technical support for the design optimization, performance evaluation, and industrial application of the continuous dissolver.

[0176] The beneficial effects of the construction method and construction system of the continuous dissolver multiphase flow reaction model in this embodiment are as follows:

[0177] (1) Improve the prediction accuracy of the continuous dissolver multiphase flow reaction model: By integrating multiple simulation technologies, a comprehensive simulation of the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver is achieved, significantly improving the prediction accuracy and reliability of the continuous dissolver multiphase flow reaction model.

[0178] (2) Reduce R & D costs: Through experimental design optimization and model verification, the number of blind experiments and pilot tests is reduced, and the R & D costs and time investment are lowered.

[0179] Example 3

[0180] This example provides a method for constructing a multi - flow reaction model of a continuous dissolver, including the following steps:

[0181] I. Simulation analysis of the functional module equipment of the continuous dissolver

[0182] 1. Functional module division and model establishment

[0183] Gas lift device: First, according to the gas flow characteristics in the continuous dissolver, a three - dimensional geometric model of the gas lift device is designed. Using the multiphase flow module in CFD software (such as ANSYS Fluent), set the gas phase as the continuous phase and the liquid phase as the dispersed phase, and define boundary conditions such as gas inlet velocity and pressure.

[0184] Bottom purge device: Establish a three - dimensional model of the bottom purge device, including parameters such as the arrangement of purge nozzles, the type and flow rate of purge gas. In the CFD simulation, set the purge gas as the continuous phase, interact with the liquid phase, and simulate the gas - liquid mixing and flow state during the purge process.

[0185] Water seal structure: For the top water seal structure, use the VOF model to simulate the dynamic change of the gas - liquid interface. Establish a three - dimensional model of the water seal structure, set parameters such as the initial liquid level height and liquid flow rate, and simulate the sealing effect of the water seal on the gas and the fluctuation of the gas - liquid interface.

[0186] Steam heating jacket: Establish a three - dimensional model of the steam heating jacket, and define parameters such as steam inlet temperature, pressure and heating power. In the CFD (Computational Fluid Dynamics) simulation, regard the steam as the continuous phase, and conduct heat exchange with the liquid phase through the heating wall surface to simulate the influence of the heating process on the liquid phase temperature.

[0187] Rotating wheel bucket and distributor: Design a three - dimensional model according to the structure of the rotating wheel bucket and the distributor, considering the influence of its motion characteristics on fluid flow. In the simulation, use the dynamic mesh technology to simulate the rotational motion of the rotating wheel bucket, and simulate the distribution process of solid particles in the distributor through the DPM model.

[0188] Liquid - surface defoaming device: Establish a three - dimensional model of the liquid - surface defoaming device, and define parameters such as the injection position, flow rate and type of defoamer. In the simulation, regard the defoamer as a discrete phase, interact with the bubbles in the liquid phase, and simulate the defoaming effect.

[0189] 2. Simulation parameter setting and calculation

[0190] Set the simulation time step and total duration to ensure that the simulation process can fully reflect the dynamic changes in the continuous dissolver.

[0191] Set the fluid physical property parameters such as density, viscosity, specific heat capacity, etc., and the chemical reaction kinetic parameters such as reaction rate constant, activation energy, etc.

[0192] Initialize the boundary conditions and initial conditions of the continuous dissolver, including boundary conditions such as inlet velocity, temperature, pressure, etc., and initial conditions such as initial liquid level height, temperature distribution, etc.

[0193] Run the simulation calculation, observe the fluid flow, heat and mass transfer, and chemical reaction processes in each functional module, and record the changes of key parameters.

[0194] II. Establishment, Parameter Calibration and Verification of the Mathematical Model for the Dissolution Reaction of Fuel Short Sections

[0195] 1. Basic Experiments and Data Collection

[0196] Design and implement a series of basic experiments, including the dissolution experiments of fuel short sections in solution under different temperature, pressure, and concentration conditions. Record the changes of parameters such as the production rate, component concentration, temperature, etc. of each phase substance during the dissolution process.

[0197] Sort out and analyze the experimental data, and extract key parameters for the calibration and verification of the subsequent dissolution reaction mathematical model.

[0198] 2. Establishment and Calibration of the Dissolution Reaction Mathematical Model

[0199] According to the physical and chemical mechanism of the dissolution process, establish the corresponding dissolution reaction mathematical model. The physical and chemical mechanism of the dissolution process includes mass conservation equation, energy conservation equation, momentum conservation equation, and chemical reaction kinetic equation, etc.

[0200] Use data regression and parameter estimation methods to calibrate the dissolution reaction mathematical model. By minimizing the error between the experimental data and the predicted values of the dissolution reaction mathematical model, determine the key parameter values in the dissolution reaction mathematical model.

[0201] 3. Verification and Revision of the Dissolution Reaction Mathematical Model

[0202] Design a reasonable experimental design (ED) scheme to verify the parameters of the dissolution reaction mathematical model. By comparing and analyzing the experimental data and simulation results, evaluate the prediction accuracy and reliability of the dissolution reaction mathematical model. If the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, determine the dissolution reaction mathematical model.

[0203] If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, make necessary corrections and improvements to the dissolution reaction mathematical model according to the verification results, and adjust the model parameters or improve the model structure based on the experimental data.

[0204] III. Multidisciplinary Coupling Simulation of Three-Dimensional Gas-Liquid-Solid Multiphase and Multicomponent Flow Heat Transfer and Mass Transfer Processes

[0205] 1. Construction of the Overall Continuous Dissolver Multiphase Flow Reaction Model and Mesh Generation

[0206] Based on the Eulerian multiphase flow model, construct an overall simulation model that includes the equipment of each functional module of the continuous dissolver, namely the continuous dissolver multiphase flow reaction model. Use a professional preprocessing software (such as ANSYS Meshing) to generate a mesh for the model to ensure that the mesh quality meets the calculation requirements.

[0207] Select an appropriate mesh type and size according to the simulation requirements to ensure that the flow, heat transfer, mass transfer, and chemical reaction processes in the continuous dissolver can be accurately captured.

[0208] 2. Coupled Calculation Process

[0209] Realize the transient time-step coupling between the DEM model and the CFD multiphase flow simulation technology. In each time step, first, the CFD multiphase flow simulation technology calculates the fluid flow conditions, including the velocity field, temperature field, and pressure field, etc.

[0210] Transfer the flow field data of the CFD multiphase flow simulation technology to the DEM model, and the DEM model calculates the motion trajectories of solid particles and the interactions between phases (such as momentum transfer, energy transfer, and mass transfer, etc.).

[0211] Introduce the interphase interactions calculated by the DEM model into the control equations of the CFD multiphase flow simulation technology in the form of source terms to achieve the dynamic interaction between the fluid and the particles.

[0212] Repeat the above steps until the preset simulation time is reached or the convergence condition is satisfied. During the simulation process, continuously monitor the changes in key parameters, such as fluid velocity, temperature, concentration distribution, and the motion trajectories of solid particles, etc.

[0213] 3. Testing and Optimization of the Continuous Dissolver Multiphase Flow Reaction Model

[0214] Using the calibrated and verified dissolution reaction mathematical model, develop a continuous dissolver multiphase flow reaction model for interphase heat transfer and mass transfer in three-dimensional fluid calculations. By simulating the dissolution process under actual working conditions, test the stability and convergence of the continuous dissolver multiphase flow reaction model.

[0215] Observe the key features such as fluid flow patterns, temperature distributions, and concentration gradients in the simulation results, conduct a comparative analysis with the experimental data, evaluate the prediction accuracy and reliability of the multi-phase flow reaction model for the continuous dissolver. If the prediction accuracy and reliability of the multi-phase flow reaction model for the continuous dissolver meet the preset requirements, determine the multi-phase flow reaction model for the continuous dissolver.

[0216] If the prediction accuracy and reliability of the multi-phase flow reaction model for the continuous dissolver do not meet the preset requirements, optimize and adjust the multi-phase flow reaction model for the continuous dissolver according to the verification results.

[0217] Conduct necessary optimization and adjustment of the multi-phase flow reaction model for the continuous dissolver according to the test results. For example, adjust the grid size to improve the calculation accuracy, optimize the algorithm parameters to accelerate the convergence speed, or modify the model structure to more accurately reflect the actual physico-chemical process.

[0218] 4. Result Analysis and Application

[0219] Conduct a comprehensive analysis of the simulation results, and extract key performance indicators such as dissolution rate, mass transfer efficiency, and energy consumption.

[0220] Apply the simulation results to the design optimization of the continuous dissolver, and guide the adjustment of the equipment structure size, the optimization of operating conditions, and the improvement of the process flow of the continuous dissolver.

[0221] Based on the simulation results, predict the performance of the continuous dissolver under different working conditions, and provide a scientific basis and technical support for industrial applications.

[0222] The construction method and construction system of the multi-phase flow reaction model for the continuous dissolver proposed in this embodiment realize the comprehensive simulation of the complex physico-chemical processes in the continuous dissolver by integrating multiple simulation technologies. This method not only improves the prediction accuracy and reliability of the construction method and construction system of the multi-phase flow reaction model for the continuous dissolver, but also reduces the R & D cost and time investment, and provides strong technical support for the design optimization, performance evaluation, and industrial application of the continuous dissolver.

[0223] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered within the protection scope of the present invention.

Claims

1. A method for constructing a multi-stream reaction model of a continuous dissolver, characterized in that: The following steps are involved: Divide the continuous dissolver into at least two functional modules according to their functions, conduct simulation technical analysis on each functional module, and establish a corresponding simulation functional model; For the dissolution process of the short fuel segment, a mathematical model of the dissolution reaction is established; An overall simulation technical analysis is performed on each simulation functional model, and a continuous dissolver multi-flow reaction model including various functional modules is constructed. The dissolution reaction mathematical model is used for the continuous dissolver multi-flow reaction model. The stability and convergence of the continuous dissolver multi-flow reaction model are tested by simulating the dissolution process under actual working conditions. According to the test results, the continuous dissolver multi-flow reaction model is adjusted until the preset standard reflecting the actual physical and chemical process is met.

2. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 1, characterized in that: The functional modules include: gas lifting device, bottom purge device, water seal structure, steam heating jacket, rotary bucket, distributor, liquid surface defoaming device.

3. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 1, characterized in that: The specific steps of simulation technology analysis for each functional module include: Use CFD multiphase flow simulation technology to simulate gas-liquid-solid three-phase flow; The DEM model is used to simulate the motion trajectory and interaction of solid particles; The DPM model is used to simulate the distribution process of solid particles; For the area where the gas-liquid interface fluctuates, the VOF model is used for detailed simulation.

4. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 1, characterized in that: Before performing simulation technology analysis on each functional module, the following steps are also included: Set the fluid physical property parameters and chemical reaction kinetic parameters in the continuous dissolver; Initialize the continuous dissolver boundary conditions and initial conditions.

5. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 1, characterized in that: After performing simulation technical analysis on each functional module, the following steps are also included: Evaluate the performance parameters of each functional module and optimize the structural dimensions and operating conditions of the continuous dissolver.

6. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 1, characterized in that: For the dissolution process of the short fuel segment, a mathematical model of the dissolution reaction is established. The specific steps include: Analyze the dissolution process of the fuel short segment in the solution, which includes: wetting of the solid surface, generation and release of dissolved products, diffusion and mass transfer of gas in the liquid, and establish the corresponding primary dissolution reaction mathematical model; Through basic experiments and pilot-scale scale-up tests, the dissolution parameters in the dissolution process are obtained. The mathematical model of the primary dissolution reaction is calibrated using mathematical methods to obtain the mathematical model of the dissolution reaction.

7. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 6, characterized in that: For the dissolution process of the short fuel segment, a dissolution reaction mathematical model is established, and the specific steps include: Design an experimental plan to verify the parameters of the dissolution reaction mathematical model, and evaluate the prediction accuracy and reliability of the dissolution reaction mathematical model by comparing and analyzing the experimental data with the simulation results. If the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, the dissolution reaction mathematical model is determined; If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, the dissolution reaction mathematical model shall be revised and improved according to the verification results.

8. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 6, characterized in that: Dissolution parameters include: production rate of each phase substance during the dissolution process, component concentration, temperature, and contact area.

9. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 6, characterized in that: Mathematical methods include: data regression and parameter estimation.

10. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 1, characterized in that: The above-mentioned overall simulation technology analysis is performed on each simulation function model to construct a continuous dissolver multi-flow reaction model including each functional module. The specific steps are as follows: Based on the Eulerian multiphase flow model, each simulation function model is analyzed by overall simulation technology, and a continuous dissolver multi-phase flow reaction model including various functional modules is constructed.

11. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 10, characterized in that: After constructing the continuous dissolver multi-flow reaction model including various functional modules, the following steps are also included: The VOF model, DPM model and DEM model are combined to simulate the multiphase flow, heat and mass transfer and chemical reaction process in the continuous dissolver.

12. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 11, characterized in that: After simulating the multiphase flow, heat and mass transfer and chemical reaction process in the continuous dissolver by combining the VOF model, the DPM model and the DEM model, the following steps are also included: The transient time step between the DEM model and the CFD multiphase flow simulation technology is coupled. In each time step, the CFD multiphase flow simulation technology first calculates the fluid flow situation, and then passes the CFD multiphase flow simulation technology flow field data to the DEM model. The DEM model calculates the motion trajectory and interphase interaction of the solid particles. Subsequently, the interphase interaction calculated by the DEM model is introduced into the CFD multiphase flow simulation technology control equation in the form of a source term to realize the dynamic interaction between the fluid and the particles. The above steps are repeated until the preset simulation time is reached or the convergence condition is met.

13. The method for constructing a multi-stream reaction model of a continuous dissolver according to claim 1, characterized in that: After simulating the dissolution process under actual working conditions and testing the stability and convergence of the continuous dissolver multi-flow reaction model, the method further includes the following steps: Compare and analyze the fluid flow pattern, temperature distribution, and concentration gradient characteristics in the simulation results with the experimental data to evaluate the prediction accuracy and reliability of the continuous dissolver multi-flow reaction model. If the prediction accuracy and reliability of the continuous dissolver multi-flow reaction model meet the preset requirements, the continuous dissolver multi-flow reaction model is determined; If the prediction accuracy and reliability of the continuous dissolver multi-flow reaction model do not meet the preset requirements, the continuous dissolver multi-flow reaction model is optimized and adjusted according to the verification results.

14. A construction system used in the method for constructing a continuous dissolver multi-flow reaction model according to any one of claims 1 to 13, characterized in that: include: The simulation function model building unit divides the continuous dissolver into at least two function modules according to the function, performs simulation technology analysis on each function module, builds a corresponding simulation function model, and sends it to the continuous dissolver multi-flow reaction model building unit; The dissolution reaction mathematical model building unit builds the dissolution reaction mathematical model for the dissolution process of the short section of fuel and sends it to the continuous dissolver multi-flow reaction model building unit; The continuous dissolver multi-flow reaction model establishment unit conducts an overall simulation technical analysis of each simulation function model, constructs a continuous dissolver multi-flow reaction model including various functional modules, applies the dissolution reaction mathematical model to the continuous dissolver multi-flow reaction model, tests the stability and convergence of the continuous dissolver multi-flow reaction model by simulating the dissolution process under actual working conditions, and adjusts the continuous dissolver multi-flow reaction model according to the test results until the preset standard reflecting the actual physical and chemical process is reached.

15. The construction system according to claim 14, characterized in that: The functional modules include: gas lifting device, bottom purge device, water seal structure, steam heating jacket, rotary bucket, distributor, liquid surface defoaming device.

16. The construction system according to claim 14, characterized in that: The simulation function model building unit includes: The first simulation unit uses CFD multiphase flow simulation technology to simulate the gas-liquid-solid three-phase flow; The second simulation unit uses the DEM model to simulate the motion trajectory and interaction of solid particles; The third simulation unit uses the DPM model to simulate the distribution process of solid particles; In the fourth simulation unit, the VOF model is used to perform detailed simulation on the area where the gas-liquid interface fluctuates.

17. The construction system according to claim 14, characterized in that: The simulation function model building unit also includes: The parameter setting unit sets the physical property parameters of the fluid in the continuous dissolver and the chemical reaction kinetic parameters and sends them to the simulation function model building unit; The initialization unit initializes the boundary conditions and initial conditions of the continuous dissolver and sends them to the simulation function model building unit.

18. The construction system according to claim 14, characterized in that: The simulation function model building unit also includes: The simulation function model optimization unit optimizes the structural dimensions and operating conditions of the continuous dissolver according to the performance parameters of each functional module sent by the received simulation function model establishment unit.

19. The construction system according to claim 14, characterized in that: The dissolution reaction mathematical model building unit includes: The primary dissolution reaction mathematical model building unit analyzes the dissolution process of the fuel short segment in the solution. The dissolution process includes: wetting of the solid surface, generation and release of dissolved products, diffusion and mass transfer of gas in the liquid, and builds the corresponding primary dissolution reaction mathematical model and sends it to the calibration unit. The calibration unit obtains the dissolution parameters in the dissolution process through basic experiments and pilot-scale scale-up tests, and uses mathematical methods to calibrate the primary dissolution reaction mathematical model to obtain the dissolution reaction mathematical model.

20. The construction system according to claim 19, characterized in that The dissolution reaction mathematical model building unit also includes: The verification unit designs an experimental plan to verify the parameters of the dissolution reaction mathematical model, and evaluates the prediction accuracy and reliability of the dissolution reaction mathematical model by comparing and analyzing the experimental data with the simulation results. If the prediction accuracy and reliability of the dissolution reaction mathematical model meet the preset requirements, the dissolution reaction mathematical model is determined; If the prediction accuracy and reliability of the dissolution reaction mathematical model do not meet the preset requirements, the dissolution reaction mathematical model shall be revised and improved according to the verification results.

21. The construction system according to claim 19, characterized in that Dissolution parameters include: production rate of each phase substance during the dissolution process, component concentration, temperature, and contact area.

22. The construction system according to claim 19, characterized in that: Mathematical methods include: data regression and parameter estimation.

23. The construction system according to claim 14, characterized in that: The continuous dissolver multi-stream reaction model building unit includes: The overall model construction unit, based on the Eulerian multiphase flow model, conducts an overall simulation technical analysis of each simulation function model and constructs a continuous dissolver multi-phase flow reaction model including various functional modules.

24. The construction system according to claim 23, characterized in that The continuous dissolver multi-stream reaction model building unit includes: The coupled calculation unit combines the VOF model, DPM model, and DEM model to simulate the multiphase flow, heat and mass transfer, and chemical reaction processes in the continuous dissolver.

25. The construction system according to claim 24, characterized in that The coupling calculation unit is also used to couple the transient time steps between the DEM model and the CFD multiphase flow simulation technology. In each time step, the CFD multiphase flow simulation technology first calculates the fluid flow situation, and then passes the CFD multiphase flow simulation technology flow field data to the DEM model. The DEM model calculates the motion trajectory and interphase interaction of the solid particles. Subsequently, the interphase interaction calculated by the DEM model is introduced into the CFD multiphase flow simulation technology control equation in the form of a source term to realize the dynamic interaction between the fluid and the particles. The above steps are repeated until the preset simulation time is reached or the convergence condition is met.

26. The construction system according to claim 14, characterized in that: The continuous dissolver multi-stream reaction model building unit includes: An evaluation unit compares and analyzes the fluid flow pattern, temperature distribution, and concentration gradient characteristics in the simulation results with the experimental data to evaluate the prediction accuracy and reliability of the continuous dissolver multi-flow reaction model. If the prediction accuracy and reliability of the continuous dissolver multi-flow reaction model meet the preset requirements, the continuous dissolver multi-flow reaction model is determined; If the prediction accuracy and reliability of the continuous dissolver multi-flow reaction model do not meet the preset requirements, the continuous dissolver multi-flow reaction model is optimized and adjusted according to the verification results.

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