A method for calculating the shutdown angle of converter slag dumping operation based on three-dimensional modeling

Abstract

The present invention discloses a method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling, comprising: three-dimensional modeling of the actual situation of the furnace body; obtaining the internal dimensions of the converter by constructing a function of the furnace radius and height; reconstructing a function of the slag volume and the tilting angle; when the converter is tilted to a corresponding angle, the slag volume and the weight of the collected slag are calculated by the function; then the corresponding slag density is calculated based on the difference between the theoretical slag volume and the slag weight; based on the slag density, a function of the weight of the remaining slag in the furnace and the tilting angle is obtained; then, based on the actual required slag amount and the theoretical slag weight function, the corresponding required tilting angle is obtained. The method of the present invention can accurately realize the three-dimensional modeling of the irregular lining of the converter, and calculate the shutdown angle of the slag dumping operation for the target slag amount by developing a model, thereby achieving accurate slag retention, providing operational guidance for manual slag dumping operations, reducing the dependence of this process on manual labor, and making slag dumping more automated and precise.

Description

Technical Field

[0001] The present invention relates to the technical field of steelmaking, and in particular to a method for calculating a shutdown angle of a converter slag pouring operation based on three-dimensional modeling. Background Art

[0002] Slag retention operation is a routine operation in the converter process. At present, most furnaces adopt the "first turning and then splashing" slag retention and splashing operation mode. First, slag retention smelting can reduce the consumption of metallurgical auxiliary materials to a certain extent. Secondly, how to effectively and accurately control the amount of slag retention is the key to improving the slag splashing effect and shortening the slag splashing time.

[0003] Currently, slag removal and slag retention after converter tapping are all performed manually. This is subject to individual variability and uncertainty, and slag retention control relies on personal experience, making it difficult to accurately achieve the target slag retention. Therefore, it is necessary to utilize existing information technology to develop three-dimensional modeling based on furnace thickness measurement data. Using auxiliary methods such as image recognition and model development, combined with basic metallurgical principles, the slag volume within the converter at different inclination angles can be calculated. The slag removal and furnace shutdown angles can then be determined based on the target slag retention, providing guidance for on-site production operations.

[0004] Among the existing patents, Patent No. CN113033335A discloses a method for calculating the amount of slag left in a converter based on intelligent slag analysis and three-dimensional modeling. The modeling data source is three-dimensional modeling through video recognition technology combined with "aerial triangulation algorithm". The modeling object is a three-dimensional covering image of the slag body in the converter formed by three-dimensional modeling. The data for slag amount calculation is collected during the steel-making process and the slag-pouring process. The calculation method is to multiply the volume of the slag body calculated based on the three-dimensional model of the slag body by the slag density; and Patent No. CN103397134A discloses a method for calculating the amount of slag left in a converter based on the tilting angle of the converter. The method uses a method in which the data for calculation are collected before the steel-making operation, and the calculation method is to calculate the volume of the molten body in the furnace at the starting and ending angles of slag pouring through a model, calculate the total slag amount according to metallurgical principles, calculate the volume of molten steel with the help of an auxiliary measuring device, and finally calculate the amount of slag remaining in the furnace according to the volume ratio. The modeling data sources, modeling objects, and the timing and method of collecting the data for slag calculation of the above two patents are essentially different from those of the present application, and the output objects of the above two patents are to calculate the amount of slag remaining in the furnace after the converter slag pouring operation is completed, which is also obviously different from the output object of the present application for calculating different slag pouring operation stop angles according to different slag retention requirements. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for calculating the shutdown angle of the converter slag dumping operation based on three-dimensional modeling. By performing three-dimensional modeling on the furnace lining and combining it with the basic principles of metallurgy, the slag remaining in the converter at different inclination angles is calculated. Based on this, corresponding shutdown angles are provided for different slag remaining requirements, and operational guidance is provided for manual slag dumping operations to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling includes the following steps:

[0008] S1: Use the thickness gauge and converter construction dimension drawings to complete the three-dimensional modeling of the actual furnace situation;

[0009] S2: Use the converter size function to express the converter's internal dimensions. Then, based on the 3D modeling results, construct a function of the furnace's internal radius and height. Use algebra to obtain the furnace's internal radius at various heights, i.e., the converter's internal dimensions.

[0010] S3: Construct the function of slag volume and tilting angle; the specific method is:

[0011] S301: First, the entire furnace is divided into blocks with a height of 0.001 mm from bottom to top, and a height-related horizontal coordinate function of the slag liquid level is completed, l = g(h, α), where: l is the height vertical coordinate h, and the horizontal coordinate of the liquid level corresponding to the inclination angle α;

[0012] S302: Establishing liquid surface area function, Calculate the bottom area of ​​each small block of slag related to the tilting angle. The volume of the slag in this small block is the product of the bottom surface area of ​​the slag and the height. Establish the volume function of the small block on the liquid surface, V i (h i ,α)=S i ×0.001;

[0013] S303: Add up the volumes of all small pieces, which is the slag volume related to the tilting angle, V(α)=V1+...+V n , where: n=(h top -h botton ) / 0.001,h top 、h botton are the height ordinates of the top and bottom of the converter, respectively;

[0014] S4: When the converter tilts to a certain angle, it stops and waits until the liquid level stabilizes and no slag flows out. Then, the tilt angle α1 at this time, the slag volume V(α1) calculated by the slag volume function at the corresponding tilt angle, and the weight of the collected slag at this time are recorded.

[0015] S5: After the converter is tilted to a certain angle, it stops and waits until the liquid level stabilizes and no slag flows out. The tilt angle α2 at this time, the slag volume V(α2) calculated by the slag volume function at the corresponding tilt angle, and the slag weight W2 collected at this time are recorded.

[0016] S6: Calculate the corresponding slag density based on the difference between the theoretical slag volume obtained in steps S4 and S5 and the difference between the slag weight;

[0017] S7: According to the slag density, the function of volume and inclination angle in S3 is converted into a function of the weight and inclination angle of the remaining slag in the furnace;

[0018] S8: According to the actual required slag retention amount and the theoretical slag weight function, the corresponding required tilting angle is obtained.

[0019] Furthermore, the converter size function in S2 is expressed as: r=f(h), where r is the radius of the rotating body corresponding to the height vertical coordinate h.

[0020] Furthermore, the calculation formula for the slag density in S6 is:

[0021] Furthermore, the function in S7 is calculated as follows: according to the weight of the slag and the inclination angle, the function is the product of the slag volume and density at the corresponding inclination angle, that is, W(α)=V(α)×ρ.

[0022] Furthermore, the calculation method in S8 is: given the slag weight and the weight function with respect to the inclination angle, W(α)=W c , where: W c The actual amount of slag required is a constant value, and the dependent variable of the function is calculated inversely, that is, the corresponding inclination angle, α=W -1 (W c ).

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The method of the present invention for calculating the shutdown angle of the converter slag dumping operation based on three-dimensional modeling regularly transmits and updates the converter furnace body thickness measurement data based on 5G technology or local area network WIFI according to the daily real-time thickness measurement data in the factory. It can accurately realize the three-dimensional modeling of the irregular lining of the converter, and calculate the shutdown angle of the slag dumping operation with a target slag retention amount by developing a model, thereby realizing accurate slag retention, providing operational guidance for manual slag dumping operations, reducing the dependence of this process on manual labor, and making slag dumping more automated and precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of converter size function and slag level abscissa function of the present invention;

[0026] Figure 2 Schematic diagram of the liquid surface area function and the liquid surface small block volume function of the present invention;

[0027] Figure 3 Schematic diagram of volumes V(α1) and V(α2) when the tilt angles are α1 and α2, respectively;

[0028] Figure 4 Modeling interface diagram for the furnace lining of the present invention;

[0029] Figure 5 This is the recommended value of the furnace shutdown angle and the real-time furnace inclination angle tracking interface diagram of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] like Figure 1-3 As shown, an embodiment of the present invention provides a method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling, comprising the following steps:

[0032] S1: Use the thickness gauge and converter construction dimension drawings to complete the three-dimensional modeling of the actual furnace situation;

[0033] S2: Express the internal dimensions of the converter using the converter size function, r = f(h), where r is the radius of the rotating body at the corresponding height coordinate h. Based on the 3D modeling results, a function of the internal radius and height is constructed. This allows us to clearly determine the internal radius at various heights, i.e., the internal dimensions of the converter, through algebra.

[0034] S3: Construct the function of slag volume and tilting angle; the specific method is:

[0035] First, the entire furnace is divided from bottom to top into blocks of sufficiently small height, such as 0.001mm blocks, and the height-related slag liquid level horizontal coordinate function can be completed, l = g(h, α), where: l is the height ordinate h, and the liquid level horizontal coordinate corresponding to the inclination angle α; based on this, the liquid surface area function is established. Calculate the bottom area of ​​each small block of slag related to the tilting angle. The volume of the slag in this small block can be approximated as the product of the bottom surface area and the height of the slag. Establish the volume function of the small block on the liquid surface, V i (h i ,α)=S i× 0.001, and then add up the volumes of all the small pieces, which is the approximate slag volume related to the tilting angle, V(α)=V1+...+V n , where: n=(h top -h botton ) / 0.001,h top 、h botton are the height ordinates of the top and bottom of the converter, respectively;

[0036] S4: When the converter tilts to a certain angle, it stops and waits until the liquid level stabilizes and no slag flows out. Then, the tilt angle α1 at this time, the slag volume V(α1) calculated by the slag volume function at the corresponding tilt angle, and the weight of the collected slag W1 are recorded.

[0037] S5: After the converter is tilted to a certain angle, it stops and waits until the liquid level stabilizes and no slag flows out. The tilt angle α2 at this time, the slag volume V(α2) calculated by the slag volume function at the corresponding tilt angle, and the slag weight W2 collected at this time are recorded.

[0038] S6: Calculate the corresponding slag density based on the difference between the theoretical slag volume and the slag weight obtained in steps S4 and S5.

[0039] S7: Based on the slag density, the function of volume and inclination angle in S3 is converted into a function of the weight of the remaining slag in the furnace and the inclination angle. The idea is that the function of the weight of the remaining slag and the inclination angle is the product of the volume and density of the remaining slag at the corresponding inclination angle, W(α) = V(α) × ρ;

[0040] S8: According to the actual required slag amount and the theoretical slag weight function, the corresponding required tilting angle is obtained. The idea is that the slag weight and the weight function of the tilt angle are known, W(α) = W c , where: W c The actual amount of slag required is a constant value, and the dependent variable of the function can be calculated inversely, that is, the corresponding inclination angle, α=W -1 (W c ).

[0041] Based on the above embodiments, in order to further better explain the present invention, the following specific application examples are provided:

[0042] like Figure 4-5 As shown, first, a calculation model for the converter slag dumping and shutdown angle is established. By receiving the furnace body residual thickness data measured on the day, the irregular furnace body lining 3D modeling is accurately carried out, and the calculation results of the slag liquid level horizontal coordinate function, liquid surface area function, liquid surface small block volume function and other functions are updated.

[0043] Then, based on the target slag retention amount and slag state (fluidity), the function within the model is calculated to output the shutdown angle corresponding to the target slag retention amount, providing operational guidance for on-site slag dumping operations.

[0044] The start and stop angles of the slag dumping operation are then collected and recorded. The model calculates the amount of slag in the furnace at the corresponding angles, and the difference between the two is compared with the actual slag weight recorded on site to verify the accuracy of the model calculation. If the comparison deviation is continuously greater than the allowable range, the model automatically generates a correction coefficient and adjusts the model calculation parameters to ensure that the slag dumping and furnace stop angles output by the model are timely and reliable.

[0045] Based on the above application examples, the factory regularly transmits and updates the converter body thickness measurement data based on daily real-time thickness measurement data using 5G technology or local area network WIFI, accurately realizes the three-dimensional modeling of the irregular lining of the converter, and calculates the slag dumping operation shutdown angle for the target slag retention amount through the development model to achieve accurate slag retention.

[0046] By comparing the actual slag dumping amount with the slag dumping amount calculated by the model, the deviation between the two is within the allowable range, the model reliability is high, and it can provide the site with slag dumping and shutdown angle guidance that takes into account both reliability and timeliness.

[0047] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling, characterized in that: The following steps are involved: S1: Use the thickness gauge and converter construction dimension drawings to complete the three-dimensional modeling of the actual furnace situation; S2: Use the converter size function to express the converter's internal dimensions. Then, based on the 3D modeling results, construct a function of the furnace's internal radius and height. Use algebra to obtain the furnace's internal radius at various heights, i.e., the converter's internal dimensions. S3: Construct the function of slag volume and tilting angle; the specific method is: S301: First, the entire furnace is divided into blocks with a height of 0.001 mm from bottom to top, and a height-related horizontal coordinate function of the slag liquid level is completed, l = g(h, α), where: l is the height vertical coordinate h, and the horizontal coordinate of the liquid level corresponding to the inclination angle α; S302: Establishing liquid surface area function, Calculate the bottom area of ​​each small block of slag related to the tilting angle. The volume of the slag in this small block is the product of the bottom surface area of ​​the slag and the height. Establish the volume function of the small block on the liquid surface, V i (h i ,α)=S i ×0.001; S303: Add up the volumes of all small pieces, which is the slag volume related to the tilting angle, V(α)=V1+...+V n , where: n=(h top -h botton ) / 0.001,h top 、h botton are the height ordinates of the top and bottom of the converter, respectively; S4: When the converter tilts to a certain angle, it stops and waits until the liquid level stabilizes and no slag flows out. Then, the tilt angle α1 at this time, the slag volume V(α1) calculated by the slag volume function at the corresponding tilt angle, and the weight of the collected slag at this time are recorded. S5: After the converter is tilted to a certain angle, it stops and waits until the liquid level stabilizes and no slag flows out. The tilt angle α2 at this time, the slag volume V(α2) calculated by the slag volume function at the corresponding tilt angle, and the slag weight W2 collected at this time are recorded. S6: Calculate the corresponding slag density based on the difference between the theoretical slag volume obtained in steps S4 and S5 and the difference between the slag weight; S7: According to the slag density, the function of volume and inclination angle in S3 is converted into a function of the weight and inclination angle of the remaining slag in the furnace; S8: According to the actual required slag retention amount and the theoretical slag weight function, the corresponding required tilting angle is obtained.

2. The method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling according to claim 1, characterized in that: The converter size function in S2 is expressed as: r=f(h), where r is the radius of the rotating body corresponding to the height vertical coordinate h.

3. The method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling according to claim 2, characterized in that: The calculation formula for slag density in S6 is:

4. The method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling according to claim 3, characterized in that: The calculation method of the function in S7 is: according to the weight of the slag and the inclination angle, the function is the product of the slag volume and density at the corresponding inclination angle, that is, W(α)=V(α)×ρ.

5. The method for calculating the shutdown angle of a converter slag dumping operation based on three-dimensional modeling according to claim 4, characterized in that: The calculation method in S8 is: given the slag weight and the weight function with respect to the inclination angle, W(α)=W c , where: W c The actual amount of slag required is a constant value, and the dependent variable of the function is calculated inversely, that is, the corresponding inclination angle, α=W -1 (W c ).

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