Electric arc furnace flow field simulation design method and device

Abstract

The application discloses an electric arc furnace flow field simulation design method and device, and relates to the field of electric arc furnace smelting, which comprises the steps of obtaining an electric arc furnace geometric model, dividing a grid model, numerical simulation calculation and result verification processing. The electric arc furnace geometric model comprises a molten pool flow field area, an in-furnace gas flow field area, a jet development area and a full-size oxygen lance flow area. The grid model is divided according to the electric arc furnace geometric model to obtain a grid file. Numerical simulation calculation is carried out according to the grid file to obtain a numerical simulation calculation result. The result is verified and post-processed according to the numerical simulation calculation result. The application uses a numerical simulation flow field simulation analysis method, uses three-dimensional software to establish an electric arc furnace simulation model, and then carries out simulation analysis on the electric arc furnace model, so that the process research and development cycle is greatly reduced. Meanwhile, the complicated test process is omitted, the process research and development efficiency is improved, and the application has important significance for optimizing the design of the electric arc furnace flow field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric arc furnace, and particularly relates to an electric arc furnace flow field simulation design method and device. BACKGROUND

[0002] The oxygen lance of the furnace wall plays a decisive role in the flow field form of the electric arc furnace, and a reasonable oxygen lance arrangement scheme can improve the cleanliness of the molten steel, accelerate the solute transmission, uniform the component temperature and reduce the dead zone of the molten pool. In order to obtain the best oxygen lance arrangement parameters, the commonly used method at present is to continuously correct the oxygen lance parameters through repeated industrial tests, and this method has the problems of long process development cycle, high cost and low efficiency. SUMMARY

[0003] The main purpose of the present application is to provide an electric arc furnace flow field simulation design method and device, which aims to solve the technical problems of long cycle, high cost and low efficiency in the optimization of the electric arc furnace flow field in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] In a first aspect, the present application provides an electric arc furnace flow field simulation design method, which comprises:

[0006] obtaining an electric arc furnace geometric model, wherein the electric arc furnace geometric model comprises a molten pool flow field domain, a furnace gas flow field domain, a jet development domain and a full-size oxygen lance flow domain;

[0007] carrying out grid division according to the electric arc furnace geometric model to obtain a grid file;

[0008] carrying out numerical simulation calculation according to the grid file to obtain a numerical simulation calculation result;

[0009] carrying out result verification and post-processing according to the numerical simulation calculation result.

[0010] Optionally, in the electric arc furnace flow field simulation design method, the step of obtaining the geometric model of the electric arc furnace, wherein the geometric model comprises a molten pool flow field domain, a furnace gas flow field domain, a jet development domain and an oxygen lance model comprises:

[0011] obtaining a molten pool flow field domain;

[0012] establishing a furnace gas flow field domain above the molten pool flow field domain;

[0013] establishing a jet development domain above the furnace gas flow field domain;

[0014] establishing a full-size oxygen lance flow domain on the jet development domain, wherein the full-size oxygen lance flow domain comprises an oxygen lance contraction section, an oxygen lance throat and an oxygen lance expansion section.

[0015] Optionally, in the electric arc furnace flow field simulation design method, the step of performing mesh division according to the electric arc furnace geometric model to obtain a grid file comprises:

[0016] According to the electric arc furnace geometric model, the model is repaired to obtain a model block;

[0017] According to the model block, a first cutting process is performed to obtain a corresponding flow field domain block, wherein the flow field domain block includes an upper flow field domain block and a molten pool flow field domain block;

[0018] According to the upper flow field domain block, a second cutting process is performed to obtain a jet development domain block and an in-furnace gas flow field domain block;

[0019] According to the jet development domain block, the in-furnace gas flow field domain block and the molten pool flow field domain block, a third cutting process is performed to obtain a jet development domain block subset, an in-furnace gas flow field domain block subset and a molten pool flow field domain block subset;

[0020] According to the jet development domain block subset, the in-furnace gas flow field domain block subset and the molten pool flow field domain block subset, model surface association and model association are performed to obtain a quasi-grid file;

[0021] According to the quasi-grid file, an adjustment process is performed to obtain a grid file.

[0022] Optionally, in the electric arc furnace flow field simulation design method, the step of performing numerical simulation calculation according to the grid file to obtain a numerical simulation calculation result comprises:

[0023] Setting material properties, multiphase flow model, multiphase flow model parameters and boundary conditions, relaxation factor, iteration residual, iteration step and iteration step number;

[0024] According to the material properties, multiphase flow model, multiphase flow model parameters, boundary conditions, relaxation factor, iteration residual, iteration step and iteration step number, numerical simulation calculation is performed on the grid file to obtain a first calculation result;

[0025] According to the first calculation result, the volume ratio of the flow field dead zone is obtained;

[0026] According to the volume ratio of the flow field dead zone, when the flow field dead zone volume change rate is less than a set threshold, the first calculation result is confirmed as the numerical simulation calculation result.

[0027] Optionally, in the electric arc furnace flow field simulation design method, the step of performing result verification and post-processing according to the numerical simulation calculation result comprises:

[0028] According to the numerical simulation calculation result, a simulation Mach number is obtained, wherein the simulation Mach number is the Mach number of the jet located at the oxygen lance outlet;

[0029] obtain first verification information according to the simulated Mach number;

[0030] obtain simulated molten pool impact depth and impact depth interval according to the numerical simulation settlement result;

[0031] obtain second verification information according to the simulated molten pool impact depth and impact depth interval;

[0032] obtain verification result according to the first verification information and the second verification information;

[0033] when the verification result is passed, perform post-processing on the numerical simulation calculation result, and output a flow field simulation result.

[0034] In a second aspect, the present application provides an electric arc furnace flow field simulation device, the device comprising:

[0035] a model establishing module, configured to obtain an electric arc furnace geometric model, wherein the electric arc furnace geometric model comprises a molten pool flow field domain, a furnace gas flow field domain, a jet development domain and a full-size oxygen lance flow domain;

[0036] a grid processing module, configured to perform grid division according to the electric arc furnace geometric model, and obtain a grid file;

[0037] a simulation calculation module, configured to perform numerical simulation calculation according to the grid file, and obtain a numerical simulation calculation result;

[0038] a verification module, configured to perform result verification and post-processing according to the numerical simulation calculation result.

[0039] The electric arc furnace flow field simulation design method and device provided by the present application solve the problems of long cycle, high cost and low efficiency in electric arc furnace flow field optimization by means of numerical simulation, and realize high-precision electric arc furnace flow field simulation. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 It is a flowchart of the electric arc furnace flow field simulation design method of the present application.

[0042] Figure 2 A functional module schematic diagram of the electric arc furnace flow field simulation device of the present application;

[0043] Figure 3 A structural schematic diagram of the electric arc furnace geometric model;

[0044] Figure 4 A schematic diagram after the first cutting processing of the electric arc furnace geometric model;

[0045] Figure 5 A schematic diagram after the association of the electric arc furnace geometric model;

[0046] Figure 6 A grid schematic diagram of the electric arc furnace geometric model;

[0047] Figure 7 A schematic diagram of the first verification information of the embodiment one of the electric arc furnace flow field simulation design method of the present application;

[0048] Figure 8 A schematic diagram of the second verification information of the embodiment one of the electric arc furnace flow field simulation design method of the present application;

[0049] Figure 9 A dead zone distribution diagram in the numerical simulation calculation result of the embodiment one of the electric arc furnace flow field simulation design method of the present application;

[0050] Figure 10 A velocity nephogram in the numerical simulation calculation result of the embodiment one of the electric arc furnace flow field simulation design method of the present application.

[0051] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings in combination with the embodiments. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0053] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element. In the present invention, the use of suffixes such as "module," "component," or "unit" to denote elements is merely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "component," or "unit" can be used interchangeably. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this is based on the fact that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0054] Example 1

[0055] Reference Figure 1 The flowchart, combined with Figures 3 to 10 The present invention provides a first embodiment of the electric arc furnace flow field simulation design method, which may include the following steps:

[0056] Step S10: Obtain the geometric model of the electric arc furnace, wherein the geometric model of the electric arc furnace includes the molten pool flow field, the gas flow field inside the furnace, the jet development field, and the full-size oxygen lance flow field.

[0057] Specifically, the geometric model of the electric arc furnace can be obtained using Solidworks modeling software, and the geometric model of the electric arc furnace is a full-size geometric model.

[0058] Step S20: Mesh the electric arc furnace according to its geometric model to obtain a mesh file.

[0059] Specifically, ICEM-CFD software can be used to perform full hexahedral structured mesh generation on the mesh file.

[0060] Step S30: Perform numerical simulation calculations based on the grid file to obtain the numerical simulation calculation results.

[0061] Specifically, the Ansys-Fluent software can be used to perform numerical simulation calculation on the grid file by selecting a multiphase flow model.

[0062] Step S40: verifying and post-processing the results according to the numerical simulation calculation results.

[0063] Specifically, the CFD-POST software can be used to verify and post-process the numerical simulation calculation results, wherein the verification includes Mach number verification and impact depth verification. When the verification passes, the numerical simulation calculation results are post-processed to output the flow field simulation calculation results. When the verification fails, the grid file can be re-divided in step S20.

[0064] Further, step S10 can include:

[0065] Step S11: obtaining a molten pool flow field domain;

[0066] Step S12: establishing an in-furnace gas flow field domain above the molten pool flow field domain;

[0067] Step S13: establishing a jet development domain above the in-furnace gas flow field domain;

[0068] Step S14: establishing a full-size oxygen lance flow domain above the jet development domain, wherein the full-size oxygen lance flow domain includes an oxygen lance contraction section, an oxygen lance throat, and an oxygen lance expansion section.

[0069] Specifically, in one specific embodiment, the jet development domain is in a cylindrical shape, the lower surface of the cylinder forms an angle θ with the gas flow field domain, θ is the angle between the center line of the oxygen lance and the vertical direction, the upper surface of the cylinder is perpendicular to the normal direction, and the center line of the oxygen lance is perpendicular to the upper surface of the cylinder.

[0070] Further, step S20 can include:

[0071] Step S21: repairing the model according to the electric arc furnace geometric model to obtain a model block;

[0072] Specifically, the Repair Geometry command can be used to repair the model of the electric arc furnace geometric model, and then the boundary naming is performed, wherein the oxygen lance inlet is inlet, the upper surface of the in-furnace gas flow field is outlet, and the rest is wall.

[0073] Step S22: performing first segmentation processing according to the model block to obtain a corresponding flow field domain block, wherein the flow field domain block includes an upper flow field domain block and a molten pool flow field domain block;

[0074] Specifically, the model block is divided into the up-flow field block and the molten pool flow field block along the liquid surface of the molten pool by using a Split Block command, and is named as R-Oxygen and R-Steel respectively;

[0075] Step S23: performing a second cutting processing according to the up-flow field block to obtain a jet development domain block and a furnace gas flow field block;

[0076] Specifically, the up-flow field block R-Oxygen is divided into the furnace gas flow field block in-Oxygen and the jet development domain block lan-Oxygen along the outlet.

[0077] Step S24: performing a third cutting processing according to the jet development domain block, the furnace gas flow field block and the molten pool flow field block to obtain a jet development domain block subset, a furnace gas flow field block subset and a molten pool flow field block subset;

[0078] Specifically, the step S24 can include the following steps:

[0079] Step S241: performing an O-Block cutting on the whole flow field block, and ignoring the upper surface of the up-flow field block lan-Oxygen when performing the O-Block cutting;

[0080] Step S242: deleting the O-Block internal block in the jet development domain block lan-Oxygen, selecting all peripheral blocks, extending cutting along the jet development domain, and then deleting the redundant blocks in the jet development domain block lan-Oxygen;

[0081] Step S243: performing a second O-Block cutting on the retained blocks of the jet development domain block lan-Oxygen, deleting the peripheral blocks of the oxygen lance model, and ignoring the bottom block of the molten pool flow field block R-Steel when performing the O-Block cutting;

[0082] Step S243: performing a third O-Block cutting on the retained blocks of the oxygen lance model, and ignoring the bottom block of the molten pool flow field block R-Steel when performing the O-Block cutting.

[0083] Step S25: performing model face association and model line association according to the jet development domain block subset, the furnace gas flow field block subset and the molten pool flow field block subset to obtain a quasi-grid file;

[0084] Specifically, the Selected Surface mode under the Associate Face to Surface command is selected, the Face is set to the bottom five faces of the molten pool flow field block R-Steel, the Surface is set to the bottom face of the electric arc furnace geometric model, the model line association is performed, and the Edit Edge command is used to process the arc line.

[0085] Step S26: adjusting according to the quasi-grid file to obtain a grid file, and the grid quality Quality after the adjustment should be greater than 0.2.

[0086] Specifically, step S26 can include:

[0087] Step S261: node alignment, and setting a global grid size;

[0088] Step S262: grid encryption for the oxygen lance outlet jet development area;

[0089] Step S262: after adaptive processing of the grid, generating a grid and outputting a grid file of Ansys-Fluent.

[0090] Further, step S30 can include:

[0091] Step S31: obtaining material properties, a multiphase flow model, multiphase flow model parameters, and boundary conditions;

[0092] Specifically, the material properties can include steel liquid density / (kg·m -3 ), steel liquid viscosity / (kg·m -1 ·s -1 ), oxygen density / (kg·m -3 ), oxygen viscosity / (kg·m -1 ·s -1 ), oxygen thermal conductivity / (W·m -1 ·K -1 ), oxygen heat capacity / (J·kg -1 ·K -1 ), and oxygen temperature / (K).

[0093] In one specific embodiment, the multiphase flow model adopts a VOF model, and the control equation is as follows:

[0094]

[0095] wherein, , , are the volume fraction, density kg·m 3 , and velocity m·s -1 of the i-th phase, respectively, is the mass of the i-th phase flowing to the j-th phase, kg; is the mass of the j-th phase flowing to the i-th phase, kg.

[0096] ​Step S32: performing numerical simulation calculation on the grid file according to the material attribute, the multiphase flow model, the multiphase flow model parameter, the boundary condition, the relaxation factor, the iteration residual, the iteration step length and the iteration step number, and obtaining a first calculation result;

[0097] Specifically, a transient model is adopted, an inlet boundary is set as a pressure inlet, an outlet boundary is set as a pressure outlet, and wall surfaces are all set as no-slip boundary conditions. A SIMPLE algorithm is used to solve the flow field equation, and variables are discretized by using a second-order upwind scheme. When variable residuals are all less than 10 -5

[0098] Specifically, molten steel with a pool flow velocity less than 0.01 m / s is regarded as a dead zone.

[0099] Step S33: when a flow field dead zone volume change rate is less than 10%, the first calculation result is confirmed as a numerical simulation calculation result.

[0100] Further, step S40 can include:

[0101] Step S41: obtaining a simulation Mach number according to the numerical simulation calculation result, wherein the simulation Mach number is a Mach number of a jet flow located at an oxygen lance outlet;

[0102] Specifically, an oxygen lance center line is created, and a calculation formula of the simulation Mach number is as follows:

[0103] ;

[0104] wherein k is a gas adiabatic index, the adiabatic index k is 1.66 for a monatomic gas, and the adiabatic index k is 1.41 for a diatomic gas; R is a gas constant, J(kg·K) -1 ; Temperature is temperature, ℃; Velocity is jet flow velocity, m·s -1 .

[0105] Step S42: obtaining first verification information according to the simulation Mach number;

[0106] In a specific implementation process, when the simulation Mach number is 0.9-1.1 times of an oxygen lance design Mach number, the first verification information is passed; when the simulation Mach number exceeds the above range, the first verification information is failed;

[0107] Step S43: obtaining a simulation molten pool impact depth and an impact depth interval according to the numerical simulation calculation result;

[0108] Specifically, a calculation formula of the impact depth interval is as follows: ​

[0109] ;

[0110] wherein, is the jet density at the outlet of the lance, kg·m 3 ; is the jet density at the outlet of the lance, kg·m 3 ; is the jet velocity at the outlet of the lance, m·s -1 ; is the jet velocity at the outlet of the lance, m·s -1 ; is the diameter of the outlet of the lance, m; is the density of the liquid steel, kg·m 3 ;θ is the angle between the center line of the lance and the vertical direction, °; H is the vertical installation height of the lance, m; g is the acceleration of gravity, 9.81 m·s -1 ; is the proportional coefficient, =0.8~1.2.

[0111] Step S44: obtaining second verification information according to the simulated molten pool impact depth and the impact depth interval;

[0112] Specifically, when the simulated molten pool impact depth is within the impact depth interval, the first verification information is pass; when the simulated molten pool impact depth is not within the impact depth interval, the first verification information is fail.

[0113] Step S45: obtaining a verification result according to the first verification information and the second verification information;

[0114] Specifically, when the first verification information and the second verification information are both pass, it is confirmed that the verification result is pass; when one of the first verification information and the second verification information is fail, it is confirmed that the verification result is fail.

[0115] Step S46: when the verification result is pass, performing post-processing on the numerical simulation calculation result, and outputting a flow field simulation calculation result.

[0116] The electric arc furnace flow field simulation design method provided in the embodiment solves the problems of long cycle, high cost and low efficiency in the optimization of the electric arc furnace flow field by means of numerical simulation, and realizes high-precision electric arc furnace flow field simulation.

[0117] Embodiment Two

[0118] Based on the same inventive concept, the arc furnace flow field simulation device provided by the embodiment is described in detail below with reference to the function module diagram shown in Figure 2 The device can include:

[0119] The model establishing module 100 is configured to acquire an arc furnace geometric model, wherein the arc furnace geometric model includes a molten pool flow field domain, a furnace gas flow field domain, a jet development domain and a full-size oxygen lance flow domain.

[0120] The grid processing module 200 is configured to perform grid division according to the arc furnace geometric model to obtain a grid file.

[0121] The simulation calculation module 300 is configured to perform numerical simulation calculation according to the grid file to obtain a numerical simulation calculation result.

[0122] The verification module 400 is configured to perform result verification and post-processing according to the numerical simulation calculation result.

[0123] It should be noted that the functions that can be achieved by each module of the arc furnace flow field simulation device provided by the embodiment and the technical effects achieved thereby can refer to the descriptions of the specific embodiments of the arc furnace flow field simulation design method of the present application. In order to make the description brief, the descriptions will not be repeated here.

[0124] It should be noted that the serial numbers of the above embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments. The above embodiments are only optional embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent flow conversion made by using the content of the present application specification and drawings, or directly or indirectly applied to other related technical fields under the inventive concept of the present application, is included in the patent protection scope of the present application.

Claims

1. An electric arc furnace flow field simulation design method, characterized in that, The method comprises: obtaining an electric arc furnace geometric model, wherein the electric arc furnace geometric model comprises a molten pool flow field domain, a furnace gas flow field domain, a jet development domain and a full-size oxygen lance flow domain; grid division is performed according to the electric arc furnace geometric model to obtain a grid file; numerical simulation calculation is performed according to the grid file to obtain a numerical simulation calculation result; the numerical simulation calculation result is verified and post-processed; the step of obtaining the electric arc furnace geometric model, wherein the geometric model comprises a molten pool flow field domain, a furnace gas flow field domain, a jet development domain and a full-size oxygen lance flow domain, comprises: obtaining a molten pool flow field domain; establishing a furnace gas flow field domain above the molten pool flow field domain; establishing a jet development domain above the furnace gas flow field domain; establishing a full-size oxygen lance flow domain above the jet development domain, wherein the full-size oxygen lance flow domain comprises an oxygen lance contraction section, an oxygen lance throat and an oxygen lance expansion section; the step of performing numerical simulation calculation according to the grid file to obtain a numerical simulation calculation result, comprises: setting material properties, a multiphase flow model, multiphase flow model parameters, boundary conditions, a relaxation factor, an iteration residual, an iteration step length and an iteration step number; performing numerical simulation calculation on the grid file according to the material properties, the multiphase flow model, the multiphase flow model parameters, the boundary conditions, the relaxation factor, the iteration residual, the iteration step length and the iteration step number to obtain a first calculation result; obtaining a flow field dead zone volume ratio according to the first calculation result; when the flow field dead zone volume change rate is less than a set threshold value according to the flow field dead zone volume ratio, confirming that the first calculation result is the numerical simulation calculation result; the step of verifying and post-processing the numerical simulation calculation result, comprises: obtaining a simulation Mach number according to the numerical simulation calculation result, wherein the simulation Mach number is the Mach number of the jet at the oxygen lance outlet; obtaining first verification information according to the simulation Mach number; obtaining a simulation molten pool impact depth and an impact depth interval according to the numerical simulation calculation result; obtaining second verification information according to the simulation molten pool impact depth and the impact depth interval; obtaining verification results according to the first verification information and the second verification information; when the verification results are passed, post-processing the numerical simulation calculation result to output a flow field simulation result; when the verification results are not passed, returning to the step of re-dividing the grid file.

2. The electric arc furnace flow field simulation design method of claim 1, wherein, the step of performing grid division according to the electric arc furnace geometric model to obtain a grid file, comprises: model repair is performed according to the electric arc furnace geometric model to obtain a model block; first cutting processing is performed according to the model block to obtain corresponding flow field domain blocks, wherein the flow field domain blocks comprise an upper flow field domain block and a molten pool flow field domain block; second cutting processing is performed according to the upper flow field domain block to obtain a jet development domain block and a furnace gas flow field domain block; third cutting processing is performed according to the jet development domain block, the furnace gas flow field domain block and the molten pool flow field domain block to obtain a jet development domain block subset, a furnace gas flow field domain block subset and a molten pool flow field domain block subset; According to the jet development domain block subset, the furnace gas flow field domain block subset and the molten pool flow field domain block subset, model surface association and model association are performed to obtain a quasi-grid file; According to the quasi-grid file, adjustment processing is performed to obtain a grid file.

3. An electric arc furnace flow field simulation device, characterized in that, The device comprises: a model establishment module configured to obtain an electric arc furnace geometric model, wherein the electric arc furnace geometric model comprises a molten pool flow field domain, a furnace gas flow field domain, a jet development domain and a full-size oxygen lance flow domain; a grid processing module configured to perform grid division according to the electric arc furnace geometric model to obtain a grid file; a simulation calculation module configured to perform numerical simulation calculation according to the grid file to obtain a numerical simulation calculation result; a verification module configured to perform result verification and post-processing according to the numerical simulation calculation result; The step of obtaining the geometric model of the electric arc furnace, wherein the geometric model comprises the molten pool flow field domain, the furnace gas flow field domain, the jet development domain and the full-size oxygen lance flow domain comprises: obtaining a molten pool flow field domain; establishing a furnace gas flow field domain above the molten pool flow field domain; establishing a jet development domain above the furnace gas flow field domain; establishing a full-size oxygen lance flow domain above the jet development domain, wherein the full-size oxygen lance flow domain comprises an oxygen lance contraction section, an oxygen lance throat and an oxygen lance expansion section; The step of performing numerical simulation calculation according to the grid file to obtain a numerical simulation calculation result comprises: setting material properties, a multiphase flow model, multiphase flow model parameters, boundary conditions, a relaxation factor, an iteration residual, an iteration step length and an iteration step number; performing numerical simulation calculation on the grid file according to the material properties, the multiphase flow model, the multiphase flow model parameters, the boundary conditions, the relaxation factor, the iteration residual, the iteration step length and the iteration step number to obtain a first calculation result; obtaining a flow field dead zone volume proportion according to the first calculation result; when the flow field dead zone volume change rate is less than a set threshold value according to the flow field dead zone volume proportion, confirming the first calculation result as the numerical simulation calculation result; The step of performing result verification and post-processing according to the numerical simulation calculation result comprises: obtaining a simulation Mach number according to the numerical simulation calculation result, wherein the simulation Mach number is the Mach number of the jet at the oxygen lance outlet; obtaining first verification information according to the simulation Mach number; obtaining a simulation molten pool impact depth and an impact depth interval according to the numerical simulation calculation result; obtaining second verification information according to the simulation molten pool impact depth and the impact depth interval; obtaining a verification result according to the first verification information and the second verification information; when the verification result is passed, performing post-processing on the numerical simulation calculation result to output a flow field simulation result; when the verification result is not passed, returning to the step of performing re-division on the grid file.

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