Method for predicting temperature of molten steel in tundish stopper rod area through numerical simulation

Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for predicting the temperature of molten steel in a tundish stopper rod area through numerical simulation, by means of the method, temperature distribution in a tundish can be rapidly and accurately predicted, production delay caused by temperature uncertainty on site is reduced, and the production efficiency is improved. And energy and material waste caused by improper temperature control is avoided, so that the production cost is reduced, and the production efficiency is improved. Meanwhile, safety accidents caused by abnormal temperature can be prevented, safety production is guaranteed, and a safer working environment is provided for field workers.

Description

Technical Field

[0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for predicting the temperature of molten steel in a tundish stopper rod region by using numerical simulation. Background Art

[0002] As the last refractory container before the molten steel solidifies into a billet, the tundish can improve the uniformity of the temperature and composition of the molten steel, and the uniformity of the molten steel temperature in the tundish stopper area has an important impact on the quality of the billet. During an industrial optimization test at a steel plant, the distance between the retaining wall and the dam was changed, and cold steel was found at the tundish stopper. The reason may be that the average residence time of the molten steel in the tundish is too long, resulting in a drop in the molten steel temperature. Therefore, it is necessary to predict the molten steel temperature in the tundish stopper area with structural changes (such as the position of the retaining wall and dam). Summary of the invention

[0003] The main purpose of the invention is to provide a method for predicting the temperature of molten steel in the tundish plug rod area by using numerical simulation.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0005] A method for predicting the temperature of molten steel in a tundish plug rod region by using numerical simulation comprises the following steps:

[0006] S1. Establish the tundish model and perform mesh division;

[0007] S2. Import the meshed model into Ansys-Fluent to set initial conditions and boundary conditions, perform calculations, and finally analyze the temperature field under different retaining wall and dam distance conditions in CFD-POST post-processing software to predict the temperature of the molten steel in the tundish plug rod area.

[0008] As a preferred embodiment of the method for predicting the temperature of molten steel in the tundish stopper rod region by using numerical simulation described in the present invention, wherein: in the step S1, the calculation domain of the tundish is drawn using a rectangular coordinate system in Solidworks to establish the tundish model.

[0009] As a preferred embodiment of the method for predicting the temperature of molten steel in the tundish stopper rod area by numerical simulation described in the present invention, in step S1, the tundish model is imported into ANSYS-MESH for mesh solution and division, and the inlet and outlet positions of the tundish are locally encrypted using a triangular structure mesh.

[0010] As a preferred embodiment of the method for predicting the temperature of molten steel in the tundish stopper rod area by using numerical simulation described in the present invention, wherein: in the step S1, the tundish is a slab double-stream tundish.

[0011] As a preferred embodiment of the method for predicting the temperature of molten steel in the stopper rod area of ​​the tundish by using numerical simulation described in the present invention, wherein: in the step S2, four temperature measuring points at different positions are set in the stopper rod area of ​​the longitudinal section of the tundish, temperature measuring point one and temperature measuring point two are set on the left and right sides of the position directly above the water outlet of the tundish, and temperature measuring point three and temperature measuring point four are set directly above the water outlet of the tundish.

[0012] As a preferred embodiment of the method for predicting the temperature of molten steel in the tundish stopper rod area by using numerical simulation described in the present invention, wherein: in the step S2, the temperature field under different retaining wall and dam distance conditions is analyzed to obtain the relationship between the retaining wall and dam distance and the temperature of different temperature measuring points in the tundish.

[0013] As a preferred embodiment of the method for predicting the temperature of molten steel in the stopper rod area of ​​the tundish by using numerical simulation described in the present invention, wherein: in the step S2, the relationship between the distance between the retaining wall and the dam and the temperature at different temperature measuring points in the tundish is fitted to obtain the relationship between the temperature at different temperature measuring points in the tundish and the distance between the retaining wall and the dam.

[0014] The beneficial effects of the present invention are as follows:

[0015] The present invention proposes a method for predicting the temperature of molten steel in the tundish stopper rod area by using numerical simulation. The method can quickly and accurately predict the temperature distribution in the tundish, reduce production delays caused by temperature uncertainty on site, avoid energy and material waste caused by improper temperature control, thereby reducing production costs and improving production efficiency. At the same time, it can also prevent safety accidents caused by abnormal temperature, ensure safe production, and provide a safer working environment for on-site workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 This is a diagram of a tundish model according to an embodiment of the present invention.

[0018] Figure 2 Schematic diagram of mesh division of the tundish model according to an embodiment of the present invention.

[0019] Figure 3 This is a simulation diagram of the temperature field distribution of the tundish according to an embodiment of the present invention.

[0020] Figure 4 Schematic diagram of the distribution of temperature measurement points in the tundish according to an embodiment of the present invention.

[0021] Figure 5 This is the relationship between the distance between the retaining wall and the dam and the temperature of the temperature measuring point of the tundish according to the embodiment of the present invention.

[0022] In the figure, 1-temperature measuring point one, 2-temperature measuring point two, 3-temperature measuring point three, 4-temperature measuring point four.

[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Aiming at the problems existing in the continuous casting process, the present invention proposes a new method for predicting the temperature of molten steel in the tundish stopper rod area by using a numerical simulation method. The method establishes an accurate mathematical model to characterize the temperature of molten steel in the tundish stopper rod area, and can realize the rapid prediction of the temperature of molten steel in the tundish stopper rod area when the distance between the retaining wall and the dam is different, providing a theoretical basis for the optimization of the tundish structure.

[0026] The embodiment of the present invention provides a method for predicting the temperature of molten steel in the tundish stopper rod area by using numerical simulation. The research object is a 50t slab double-stream tundish, comprising the following steps:

[0027] S1. Use the rectangular coordinate system in Solidworks to draw the calculation domain of the tundish, and build the 3D model of the tundish according to the size of the tundish on site, such as Figure 1 The tundish model is imported into ANSYS-MESH for mesh solution and division. The inlet and outlet of the tundish are locally encrypted using a triangular structured mesh. Figure 2 shown.

[0028] S2. Import the meshed model into Ansys-Fluent to set the initial and boundary conditions and perform calculations. Finally, the temperature field under different retaining wall and dam distance conditions is calculated in CFD-POST post-processing software (the temperature field under the condition of retaining wall and dam distance of 360 mm is as follows: Figure 3As shown, Figure 3 (a) is the temperature field of the longitudinal section of the tundish. Figure 3 (b) is the temperature field of the steel liquid surface in the tundish. Four temperature measuring points at different positions (symmetrical on both sides) are set in the stopper area of ​​the longitudinal section of the tundish. The distribution of the temperature measuring points is as follows: Figure 4 As shown in Table 1, temperature measuring point 1 and temperature measuring point 2 are symmetrically set on the left and right sides of 1200mm above the water outlet of the tundish, and the horizontal distance between temperature measuring point 1 and temperature measuring point 2 is 80mm. Temperature measuring point 3 and temperature measuring point 4 are set above the water outlet of the tundish, 750mm and 830mm away from the water outlet of the tundish respectively. Then set different retaining wall distances, as shown in Table 1.

[0029] Table 1 Distance between different retaining walls and dams (mm)

[0030] spacing 1 2 3 4 5 6 7 8 9 10 Numeric 300 310 320 340 350 360 370 380 390 400

[0031] The calculated results are processed with CFD-Post to obtain the relationship between different retaining wall distances and the temperatures at different temperature measuring points in the tundish, such as Figure 5 As shown, Figure 5 (a)-(d) are the relationship between the temperature of the temperature measuring point 1, the temperature measuring point 2, the temperature measuring point 3, and the temperature measuring point 4 and the different distances between the retaining wall and the dam. According to the results of numerical simulation, the curves of the different distances between the retaining wall and the dam and the temperature of different temperature measuring points of the tundish (y) were fitted, and the relationship between the two was obtained as shown in Table 2:

[0032] Table 2

[0033]

[0034] The relationship between different retaining wall dam distances (x) and the temperatures of different measuring points of the tundish (y) in Table 2 is used to predict the tundish temperature at different retaining wall dam distances. The results are shown in Table 3.

[0035] Table 3

[0036]

[0037] This method can quickly and accurately predict the temperature distribution in the tundish, reduce production delays caused by temperature uncertainty, avoid energy and material waste caused by improper temperature control, thereby reducing production costs and improving production efficiency. At the same time, it can also prevent safety accidents caused by abnormal temperature, ensure safe production, and provide a safer working environment for on-site workers.

[0038] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for predicting the temperature of molten steel in the tundish plug rod area by numerical simulation, characterized in that: The steps include: S1. Establish the tundish model and perform mesh division; S2. Import the meshed model into Ansys-Fluent to set initial conditions and boundary conditions, perform calculations, and finally analyze the temperature field under different retaining wall and dam distance conditions in CFD-POST post-processing software to predict the temperature of the molten steel in the tundish plug rod area.

2. The method for predicting the temperature of molten steel in the tundish stopper rod region by numerical simulation according to claim 1, characterized in that: In the step S1, the calculation domain of the tundish is drawn using a rectangular coordinate system in Solidworks to establish the tundish model.

3. The method for predicting the temperature of molten steel in the tundish stopper rod region by numerical simulation according to claim 1, characterized in that: In the step S1, the tundish model is imported into ANSYS-MESH to solve and divide the mesh, and the inlet and outlet positions of the tundish are locally encrypted using a triangular structure mesh.

4. The method for predicting the temperature of molten steel in the tundish stopper rod region by numerical simulation according to claim 1, characterized in that: In the step S1, the tundish is a slab double-flow tundish.

5. The method for predicting the temperature of molten steel in the tundish stopper rod region by numerical simulation according to claim 1, characterized in that: In step S2, four temperature measuring points are set at different positions in the stopper rod area of ​​the longitudinal section of the tundish, temperature measuring point 1 and temperature measuring point 2 are set on the left and right sides of the position directly above the water outlet of the tundish, and temperature measuring point 3 and temperature measuring point 4 are set directly above the water outlet of the tundish.

6. The method for predicting the temperature of molten steel in the tundish stopper rod region by numerical simulation according to claim 1, characterized in that: In step S2, the temperature field under different retaining wall and dam distance conditions is analyzed to obtain the relationship between the retaining wall and dam distance and the temperature of different temperature measuring points of the tundish.

7. The method for predicting the temperature of molten steel in the tundish stopper rod region by numerical simulation according to claim 1, characterized in that: In the step S2, the relationship between the distance between the retaining wall and the dam and the temperature at different temperature measuring points of the tundish is fitted to obtain the relationship between the temperature at different temperature measuring points of the tundish and the distance between the retaining wall and the dam.

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