Electric arc furnace tapping control method, system and device

Abstract

The application discloses an electric arc furnace tapping control method, system and equipment, relates to the field of smelting processes and equipment, and comprises the following steps: determining the total height upper limit, total weight upper limit and slag-gold interface upper limit according to the material proportioning scheme under the optimal smelting condition of a specific steel grade; when smelting the steel grade, obtaining the total height and slag density of the slag and molten steel after the slag in the furnace is kept constant; calculating the total volume of the slag and molten steel from the total height; obtaining the molten steel density after the slag in the furnace is kept constant and the total weight of the slag and molten steel; calculating the molten steel volume from the slag density, total volume, molten steel density and total weight; calculating the slag-gold interface height of the target electric arc furnace from the molten steel volume and the geometric shape model of the target electric arc furnace; and controlling the tapping time from the total height, total height upper limit, total weight, total weight upper limit, slag-gold interface height and slag-gold interface upper limit. The application solves the problems that the slag-gold interface height of the electric arc furnace is not easy to measure and the tapping and slagging are difficult to control, and improves the tapping efficiency.

Description

Technical Field

[0001] This invention relates to the field of smelting processes and equipment, and in particular to a method, system and equipment for controlling the tapping of steel in an electric arc furnace. Background Technology

[0002] With rapid economic development and increasingly fierce market competition, the performance requirements for steel products are becoming increasingly stringent, thus placing higher demands on the electric arc furnace (EAF) smelting process. In traditional EAF steelmaking, molten steel is oxidized and reduced, and tapped when the chemical composition is satisfactory, the temperature is within requirements, the molten steel is well deoxidized, and the slag basicity and fluidity are appropriate. Precise control of the tapping time helps in judging the quality of EAF smelting, facilitates the smelting reaction, and contributes to improving EAF production efficiency, reducing energy consumption, lowering production costs, and enhancing smelting quality.

[0003] With the rapid development of steel mill technology, some steel mills have begun producing high-carbon bars and wire rods, deep-drawing steel, and other advanced products. Because deep-drawing steel plates have very low carbon content, a certain amount of expensive pig iron is often added to ensure carbon boiling during the steelmaking and refining processes. In light of this, more and more small steel mills producing high-grade steels are starting to use Direct Reduced Iron (DRI) as an alternative raw material. While the process of using DRI in electric arc furnaces is shorter and less polluting, it also produces a large amount of slag. This can lead to inaccurate molten steel discharge during tapping, resulting in inaccurate steel output, waste of raw materials, and pollution. Therefore, measuring the slag-metal interface height in electric arc furnaces helps determine when to tap and control the tapping time, thereby preventing slag from entering the ladle during tapping and preventing molten steel from being discharged during slag removal, thus achieving efficient tapping. However, the slag-metal interface height in electric arc furnaces is currently difficult to measure, making it difficult to control the tapping and slag removal times, thus affecting tapping efficiency. Summary of the Invention

[0004] Based on this, embodiments of the present invention provide a method, system, and equipment for controlling the tapping of steel in an electric arc furnace, in order to solve the problem that the height of the slag-gold interface in an electric arc furnace is difficult to measure, thereby facilitating the adjustment of the electric arc furnace operation process, accurately controlling the tapping and slag tapping time, improving the tapping efficiency, and thus improving the smelting efficiency of the electric arc furnace.

[0005] To achieve the above objectives, embodiments of the present invention provide the following solutions:

[0006] A method for controlling steel tapping in an electric arc furnace includes:

[0007] Construct a geometric model of the target electric arc furnace;

[0008] The upper limits of total height, total weight, and slag-metal interface are determined based on the material proportioning scheme under optimal smelting conditions for a specific steel grade. The upper limit of total height is the maximum height that the slag can reach when the target electric arc furnace is smelted with the best material proportioning raw materials under optimal smelting conditions. The upper limit of total weight is the total weight of molten steel and slag in the furnace when the molten steel reaches the tapping spout and begins to be tapped, under optimal smelting conditions and with the best material proportioning raw materials. The upper limit of the slag-metal interface is the height of the slag-metal interface measured when the target electric arc furnace begins to tap slag, under optimal smelting conditions and with the best material proportioning raw materials.

[0009] When smelting this specific steel grade, obtain the total height of slag and molten steel and the slag density after the slag in the target electric arc furnace is kept constant;

[0010] The total height is used to calculate the total volume of slag and molten steel in the target electric arc furnace;

[0011] Obtain the density of molten steel after the slag in the target electric arc furnace is kept constant, as well as the total weight of slag and molten steel;

[0012] The volume of molten steel is calculated based on the slag density, the total volume, the molten steel density, and the total weight.

[0013] The slag-gold interface height of the target electric arc furnace is calculated based on the molten steel volume and the geometric model.

[0014] The tapping time is controlled based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-gold interface, and the upper limit of the slag-gold interface.

[0015] Optionally, the tapping time is controlled based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-gold interface, and the upper limit of the slag-gold interface, specifically including:

[0016] If the total height is higher than the upper limit of the total height, the steel outlet will be controlled to discharge steel and an alarm will be triggered until the total height is lower than the upper limit of the total height.

[0017] If the total weight is higher than the upper limit of the total weight, then control the steel tapping port to tap steel until it is lower than the upper limit of the total weight;

[0018] If the height of the slag-metal interface is higher than the upper limit of the slag-metal interface, steel tapping is controlled, and after steel tapping is completed, slag tapping is controlled until the height of the slag-metal interface is lower than the upper limit of the slag-metal interface.

[0019] Optionally, a geometric model of the target electric arc furnace is constructed, specifically including:

[0020] Obtain the equipment parameters of the target electric arc furnace;

[0021] The geometry of the target electric arc furnace is modeled based on the equipment parameters to obtain a geometric model; the geometric model is used to characterize the relationship between the volume and height of the molten pool in the target electric arc furnace.

[0022] Optionally, when smelting this specific steel grade, the total height of the slag and molten steel and the slag density in the target electric arc furnace after the slag has been kept constant are obtained, specifically including:

[0023] When smelting this specific steel grade, after the slag in the target electric arc furnace has reached a constant level, a camera is used to capture the total height of the slag and molten steel in the target electric arc furnace.

[0024] When smelting this specific steel grade, after the slag in the target electric arc furnace is kept constant, a sampler is used to determine the slag density in the target electric arc furnace.

[0025] Optionally, the formula for calculating the total volume is:

[0026]

[0027] Where h1 represents the total height of slag and molten steel, and a, b, c, d, and e are all constants.

[0028] Optionally, the density of the molten steel after the slag in the target electric arc furnace is kept constant, and the total weight of the slag and molten steel are obtained, specifically including:

[0029] After the slag in the target electric arc furnace is kept constant, a sampler is used to determine the density of the molten steel in the target electric arc furnace.

[0030] After the slag in the target electric arc furnace is kept constant, the total weight of the slag and molten steel in the target electric arc furnace is determined by a weight sensor installed at the bottom of the target electric arc furnace.

[0031] Optionally, the formula for calculating the volume of molten steel is:

[0032]

[0033] Where V3 represents the volume of molten steel; m3 represents the total weight; V1 represents the total volume; ρ1 represents the density of slag; and ρ2 represents the density of molten steel.

[0034] Optionally, the slag-gold interface height of the target electric arc furnace is calculated based on the molten steel volume and the geometric model, specifically including:

[0035] The slag-metal interface surface area of ​​the target electric arc furnace is calculated based on the aforementioned geometric model; the formula for calculating the slag-metal interface surface area is as follows:

[0036]

[0037] Among them, S smThe surface area of ​​the slag-metal interface is represented by ; D represents the diameter of the molten pool in the target electric arc furnace.

[0038] The slag-gold interface height of the target electric arc furnace is calculated based on the molten steel volume and the slag-gold interface surface area; the formula for calculating the slag-gold interface height is:

[0039]

[0040] Where h represents the slag-metal interface height; V3 represents the volume of molten steel.

[0041] The present invention also provides an electric arc furnace tapping control system, comprising:

[0042] The model building module is used to build the geometric model of the target electric arc furnace;

[0043] The upper limit determination module determines the upper limits of total height, total weight, and slag-metal interface based on the material ratio scheme under optimal smelting conditions for a specific steel grade. The upper limit of total height is the maximum height that the slag can reach when the target electric arc furnace is smelted with the best material ratio under optimal smelting conditions. The upper limit of total weight is the total weight of molten steel and slag in the furnace when the molten steel reaches the tapping spout and begins to be tapped, under optimal smelting conditions and with the best material ratio. The upper limit of the slag-metal interface is the height of the slag-metal interface measured when the target electric arc furnace begins to tapp slag, under optimal smelting conditions and with the best material ratio.

[0044] The slag parameter acquisition module is used to obtain the total height and slag density of slag and molten steel after the slag in the target electric arc furnace is kept constant when smelting this specific steel grade.

[0045] The total volume calculation module is used to calculate the total volume of slag and molten steel in the target electric arc furnace using the total height.

[0046] The total weight acquisition module is used to obtain the density of molten steel after the slag in the target electric arc furnace is kept constant, as well as the total weight of slag and molten steel.

[0047] A molten steel volume calculation module is used to calculate the volume of molten steel based on the slag density, the total volume, the molten steel density, and the total weight.

[0048] The slag-metal interface height calculation module is used to calculate the slag-metal interface height of the target electric arc furnace based on the molten steel volume and the geometric model.

[0049] The steel tapping control module is used to control the tapping time based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-metal interface, and the upper limit of the slag-metal interface.

[0050] The present invention provides an electronic device, including a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to perform the above-described electric arc furnace steel tapping control method.

[0051] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0052] This invention provides an embodiment of the invention that obtains the total volume of slag and molten steel based on the total height of the slag and molten steel in the target electric arc furnace after the slag has reached a constant value. The volume of molten steel is calculated based on the slag density, total volume, molten steel density, and the total weight of the slag and molten steel. Finally, the slag-metal interface height of the target electric arc furnace is obtained based on the molten steel volume and a geometric model. The tapping time is controlled based on the total height, upper limit of the total height, total weight, upper limit of the total weight, slag-metal interface height, and upper limit of the slag-metal interface. This solves the problems of difficulty in measuring the slag-metal interface height in electric arc furnaces and the limited number of measurement methods. It enables the measurement of the slag-metal interface height in electric arc furnaces with defined operating processes, equipment, and raw material conditions, facilitating adjustments to the electric arc furnace operating process, precise control of tapping and slag tapping times, and improved tapping efficiency, thereby increasing the smelting efficiency of the electric arc furnace. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 A flowchart of the electric arc furnace steel tapping control method provided in an embodiment of the present invention;

[0055] Figure 2 This is a schematic diagram of the structure of the target electric arc furnace provided in an embodiment of the present invention;

[0056] Figure 3 The structure of the electric arc furnace steel tapping control system provided in the embodiments of the present invention Figure 1 ;

[0057] Figure 4 The structure of the electric arc furnace steel tapping control system provided in the embodiments of the present invention Figure 2 ;

[0058] Figure 5 This is a schematic diagram illustrating the control of steel tapping and slag removal time based on molten steel quality and total height, provided as an embodiment of the present invention.

[0059] Figure 6 This is a schematic diagram illustrating the control of steel tapping and slag tapping time based on the slag-metal interface height, provided as an embodiment of the present invention.

[0060] Symbol explanation:

[0061] Molten pool—1, Electrode—2, Furnace door—3, Tap—4, Camera—5, Weight sensor—6, Molten steel—a, Slag—b, Slag-metal interface—c. Detailed Implementation

[0062] The technical solutions of the present invention will now be described with reference to the accompanying drawings in the embodiments of the present invention.

[0063] The purpose of this invention is to provide a method, system, and equipment for controlling the tapping of steel in an electric arc furnace. By constructing a geometric model of the target electric arc furnace, the volume of molten steel is calculated based on the slag density, total volume, molten steel density, and the total weight of slag and molten steel, and the slag-metal interface height of the target electric arc furnace is finally obtained, thus solving the problem that the slag-metal interface height of an electric arc furnace is difficult to measure.

[0064] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] Example 1

[0066] See Figure 1 The electric arc furnace tapping control method of this embodiment includes:

[0067] Step 101: Construct the geometric model of the target electric arc furnace.

[0068] The structure of the target electric arc furnace is as follows Figure 2 As shown, see Figure 2 The target electric arc furnace includes: a molten pool 1, electrodes 2, a furnace door 3, and a tapping port 4. In the steelmaking process, electrodes 2 generate an electric arc to achieve heating, molten steel a is discharged from tapping port 4, b represents slag, and c represents the slag-metal interface.

[0069] Specifically, a standard electric arc furnace is used as the target electric arc furnace, and a geometric model is obtained by physically modeling the standard electric arc furnace.

[0070] Step 101 specifically includes:

[0071] (1) Obtain the equipment parameters of the target electric arc furnace.

[0072] The device parameters are stored in a device parameter database. Specifically, during storage, data can be stored in the corresponding database through a front-end human machine interface (HMI), and during use, the corresponding data can be retrieved from the database through a reading system.

[0073] The equipment parameters include: electric arc furnace body size information; wherein, the electric arc furnace body size information includes furnace height, molten pool depth, electric arc furnace molten pool diameter, etc.

[0074] (2) The geometry of the target electric arc furnace is modeled according to the equipment parameters to obtain a geometric model; the geometric model is used to characterize the relationship between the volume and height of the molten pool in the target electric arc furnace.

[0075] Step 102: Determine the upper limit of total height, upper limit of total weight, and upper limit of slag-metal interface based on the material proportioning scheme under the optimal smelting conditions for a specific steel grade.

[0076] Among them, the specific steel grade can be GCr15 steel grade, etc.

[0077] Wherein, the upper limit of the total height is the maximum height that the slag can reach when the target electric arc furnace is smelted with the best material ratio under optimal smelting conditions; the upper limit of the total weight is the total weight of molten steel and slag in the furnace when the molten steel reaches the tapping spout and begins to be tapped when the target electric arc furnace is smelted with the best material ratio under optimal smelting conditions; and the upper limit of the slag-gold interface is the height of the slag-gold interface measured when the target electric arc furnace begins to tap slag under optimal smelting conditions and with the best material ratio.

[0078] Taking a 100t eccentric bottom tapping (EBT) electric arc furnace with a power of 400kVA / t to 499kVA / t as an example, the optimal smelting conditions mentioned above refer to: using the EBT electric arc furnace smelting process, using steelmaking equipment that retains only melting, heating and necessary refining functions (such as dephosphorization and decarburization), in which process operations with power less than the set power value are transferred to the ladle refining furnace for processing, adopting the operation of retaining steel and slag, and having a ready-made molten pool from the beginning of melting, supplemented by enhanced oxygen blowing and bottom blowing stirring.

[0079] The optimal material ratio mentioned above refers to the following for steelmaking furnace charge composed of direct reduced iron (DRI) + rubber, paint cans, and light scrap steel: the ratio of DRI, rubber, paint cans, and light scrap steel is 7:1:1:1. For example, for 100kg of steelmaking furnace charge (DRI + rubber, paint cans, and light scrap steel), the ratio of DRI, rubber, paint cans, and light scrap steel should be 70kg, 10kg, 10kg, and 10kg respectively.

[0080] Step 103: Obtain the total height of slag and molten steel and the slag density in the target electric arc furnace after the slag has been kept constant.

[0081] Specifically: When smelting this particular steel grade, after the slag in the target electric arc furnace has reached a constant level, at this stage of electric arc furnace smelting, camera 5 is used to capture the total height of the slag and molten steel in the target electric arc furnace. The position of camera 5 is as follows: Figure 2 As shown.

[0082] When smelting this specific steel grade, after the slag density in the target electric arc furnace has reached a constant level, a sampling method is used to determine the slag density in the target electric arc furnace. For example, a sampler can be used to determine the slag density in the target electric arc furnace.

[0083] The timing starts from the beginning of steelmaking and smelting, and after a set time period, the slag in the target electric arc furnace reaches a constant level.

[0084] Step 104: Calculate the total volume of slag and molten steel in the target electric arc furnace using the total height.

[0085] The formula for calculating the total volume is:

[0086]

[0087] Where h1 represents the total height of slag and molten steel, and a, b, c, d, and e are all constants.

[0088] For example, the formula for calculating the total volume can be:

[0089]

[0090] Step 105: Obtain the density of molten steel after the slag in the target electric arc furnace is kept constant, as well as the total weight of slag and molten steel.

[0091] Specifically: After the slag density in the target electric arc furnace is stabilized, a sampler is used to determine the density of the molten steel in the target electric arc furnace; after the slag density in the target electric arc furnace is stabilized, a weight sensor 6 installed at the bottom of the target electric arc furnace is used to determine the total weight of the slag and molten steel in the target electric arc furnace. The position of the weight sensor 6 is as follows: Figure 2 As shown. Weight sensor 6 can be a weight-sensing scale.

[0092] Specifically, when determining the total weight, the total weight of the slag and molten steel is calculated by combining the net weight of the empty electric arc furnace measured by weight sensor 6 with the total weight of the molten steel after the addition of materials in the later stage of the reaction. The calculation formula is as follows:

[0093] m3 = m2 - m1;

[0094] Where m1 is the net weight of the empty electric arc furnace, m2 is the total weight of the furnace body in the later stage of metallurgical reaction, and m3 represents the total weight of slag and molten steel.

[0095] Step 106: Calculate the volume of molten steel based on the slag density, the total volume, the molten steel density, and the total weight.

[0096] Analyzing the proportions of molten steel and slag in the total weight, the volume occupied by molten steel is calculated using the formulas m3 = ρ1V2 + ρ2V3 and V1 = V2 + V3. From these two formulas, the formula for calculating the volume of molten steel can be derived as follows:

[0097]

[0098] Where V3 represents the volume of molten steel; V1 represents the total volume; V2 represents the volume of slag; ρ1 represents the density of slag; and ρ2 represents the density of molten steel. In practical applications, ρ1 can be taken as the average density of slag, and ρ2 can be taken as the average density of molten steel.

[0099] Step 107: Calculate the slag-gold interface height of the target electric arc furnace based on the molten steel volume and the geometric model. Specifically:

[0100] (1) Calculate the slag-metal interface surface area of ​​the target electric arc furnace based on the geometric model. The formula for calculating the slag-metal interface surface area is:

[0101]

[0102] Among them, S sm denoted by , where represents the surface area of ​​the slag-metal interface; D represents the diameter of the molten pool in the target electric arc furnace.

[0103] (2) Calculate the slag-gold interface height of the target electric arc furnace based on the molten steel volume and the slag-gold interface surface area; the formula for calculating the slag-gold interface height is:

[0104]

[0105] Where h represents the slag-metal interface height. The slag-metal interface height is the height of the interface between molten steel and slag.

[0106] Step 108: Control the tapping time based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-gold interface, and the upper limit of the slag-gold interface. Specifically:

[0107] If the total height is higher than the upper limit of the total height, the steel outlet will be controlled to discharge steel and an alarm will be triggered until the total height is lower than the upper limit of the total height.

[0108] If the total weight is higher than the upper limit of the total weight, the steel output from the tapping port is controlled until it is lower than the upper limit of the total weight.

[0109] If the height of the slag-metal interface is higher than the upper limit of the slag-metal interface, steel tapping is controlled, and after steel tapping is completed, slag tapping is controlled until the height of the slag-metal interface is lower than the upper limit of the slag-metal interface.

[0110] In one example, after step 108, the method further includes: storing the height of the gold interface and displaying it via a human-machine interface (HMI).

[0111] The electric arc furnace tapping control method of this embodiment, based on equipment, sampling parameters and electric arc furnace geometric model parameters, combined with mathematical calculation model, measures the height of the electric arc furnace slag-gold interface under the condition of determined equipment and materials, and determines the tapping time accordingly.

[0112] Example 2

[0113] In order to implement the method corresponding to Embodiment 1 above and achieve the corresponding functions and technical effects, an electric arc furnace steel tapping control system is provided below.

[0114] See Figure 3 The system includes:

[0115] Model building module 201 is used to build the geometric model of the target electric arc furnace.

[0116] The upper limit determination module 202 determines the upper limit of total height, the upper limit of total weight, and the upper limit of slag-metal interface based on the material ratio scheme under the optimal smelting conditions for a specific steel grade. The upper limit of total height is the maximum height that the slag can reach when the target electric arc furnace is smelted with the best material ratio raw materials under the optimal smelting conditions. The upper limit of total weight is the total weight of molten steel and slag in the furnace when the molten steel reaches the tapping spout and begins to be tapped when the target electric arc furnace is smelted with the best material ratio raw materials under the optimal smelting conditions. The upper limit of slag-metal interface is the height of the slag-metal interface measured when the target electric arc furnace begins to tap slag under the best material ratio raw materials under the optimal smelting conditions.

[0117] The slag parameter acquisition module 203 is used to acquire the total height and slag density of the slag and molten steel after the slag in the target electric arc furnace is kept constant when smelting this specific steel grade.

[0118] The total volume calculation module 204 is used to calculate the total volume of slag and molten steel in the target electric arc furnace using the total height.

[0119] The total weight acquisition module 205 is used to acquire the density of molten steel after the slag in the target electric arc furnace is kept constant, as well as the total weight of the slag and molten steel.

[0120] The molten steel volume calculation module 206 is used to calculate the molten steel volume based on the slag density, the total volume, the molten steel density, and the total weight.

[0121] The slag-metal interface height calculation module 207 is used to calculate the slag-metal interface height of the target electric arc furnace based on the volume of molten steel and the geometric model.

[0122] The steel tapping control module 208 is used to control the steel tapping time based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-metal interface, and the upper limit of the slag-metal interface.

[0123] In one example, see Figure 4 The slag-metal interface height calculation model of the electric arc furnace tapping control system consists of the model construction module 201, the control upper limit determination module 202, the slag parameter acquisition module 203, the total volume calculation module 204, the total weight acquisition module 205, the molten steel volume calculation module 206, and the slag-metal interface height calculation module 207.

[0124] In this example, the electric arc furnace tapping control system also includes: an electric furnace equipment and raw material parameter database, a sampling parameter database, and a results database. The electric furnace equipment and raw material parameter database stores the electric furnace equipment parameters and electric furnace material parameters; the sampling parameter database stores the sampler sampling parameters; and the results database stores the slag-metal interface height.

[0125] The electric arc furnace tapping control system also includes: a result output module; the result output module is used to display the slag-metal interface height through a human-machine interface (HMI).

[0126] See Figure 5 and Figure 6 Human-machine interfaces (HMIs) are also used for:

[0127] If the total height is higher than the upper limit of the total height, the steel outlet will be controlled to discharge steel and an alarm will be triggered until the total height is lower than the upper limit of the total height.

[0128] If the total weight inside the furnace is higher than the upper limit of the total weight, the tapping of steel is controlled until it is lower than the upper limit of the total weight.

[0129] If the height of the slag-metal interface is higher than the upper limit of the slag-metal interface, steel tapping is controlled, and after steel tapping is completed, slag tapping is controlled until the height of the slag-metal interface is lower than the upper limit of the slag-metal interface.

[0130] If the height of the slag-metal interface is lower than the upper limit of the slag-metal interface, then no steel will be produced and slag will continue to be produced.

[0131] This embodiment of the electric arc furnace (EAF) tapping control system establishes a database of equipment and raw material parameters, as well as a database of process parameters. It acquires EAF equipment parameters and models the EAF geometry to determine the relationship between the volume and height of the molten pool. After maintaining a constant slag level, it takes photographs to obtain the slag height and samples to obtain the slag density. It then calculates the slag volume and the total volume of the molten steel. Based on the measured total weight and volume of the molten steel and slag, and the densities of the slag and molten steel, it calculates the molten steel volume. Using the EAF geometry model, it calculates the height of the molten steel-slag interface. Finally, by combining the above calculation results, it achieves the measurement and calculation of the slag-metal interface height, thereby determining the tapping time. This system helps operators adjust the EAF process to improve the accuracy of EAF tapping control and precisely control the tapping time.

[0132] Example 3

[0133] This embodiment provides an electronic device, including a memory and a processor. The memory is used to store computer programs, and the processor runs the computer programs to enable the electronic device to execute the electric arc furnace steel tapping control method of Embodiment 1.

[0134] Alternatively, the aforementioned electronic device may be a server.

[0135] In addition, this embodiment of the invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the electric arc furnace steel tapping control method of Embodiment 1.

[0136] Furthermore, it should be noted that those skilled in the art should understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, embodiments of the present invention can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Moreover, embodiments of the present invention can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0137] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0138] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing terminal equipment to cause a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0139] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the invention.

[0140] It should also be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device 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 terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0141] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0142] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for controlling steel tapping in an electric arc furnace, characterized in that, include: Construct a geometric model of the target electric arc furnace; The upper limits of total height, total weight, and slag-metal interface are determined based on the material proportioning scheme under the optimal smelting conditions for a specific steel grade. The upper limit of the total height is the maximum height that the slag can reach when the target electric arc furnace is smelted with the best material ratio under optimal smelting conditions; the upper limit of the total weight is the total weight of molten steel and slag in the furnace when the molten steel reaches the tapping spout and begins to be tapped when the target electric arc furnace is smelted with the best material ratio under optimal smelting conditions; the upper limit of the slag-gold interface is the height of the slag-gold interface measured when the target electric arc furnace begins to tap slag under optimal smelting conditions and with the best material ratio. When smelting this specific steel grade, obtain the total height of slag and molten steel and the slag density after the slag in the target electric arc furnace is kept constant; The total height is used to calculate the total volume of slag and molten steel in the target electric arc furnace; Obtain the density of molten steel after the slag in the target electric arc furnace is kept constant, as well as the total weight of slag and molten steel; The volume of molten steel is calculated based on the slag density, the total volume, the molten steel density, and the total weight. The slag-gold interface height of the target electric arc furnace is calculated based on the molten steel volume and the geometric model. The tapping time is controlled based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-gold interface, and the upper limit of the slag-gold interface. The formula for calculating the total volume is: ； in, h 1 represents the total height of slag and molten steel. , , , , All are constants.

2. The electric arc furnace tapping control method according to claim 1, characterized in that, The tapping time is controlled based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-gold interface, and the upper limit of the slag-gold interface, specifically including: If the total height is higher than the upper limit of the total height, the steel outlet will be controlled to discharge steel and an alarm will be triggered until the total height is lower than the upper limit of the total height. If the total weight is higher than the upper limit of the total weight, then control the steel tapping port to tap steel until it is lower than the upper limit of the total weight; If the height of the slag-metal interface is higher than the upper limit of the slag-metal interface, steel tapping is controlled, and after steel tapping is completed, slag tapping is controlled until the height of the slag-metal interface is lower than the upper limit of the slag-metal interface.

3. The electric arc furnace tapping control method according to claim 1, characterized in that, Constructing the geometric model of the target electric arc furnace, specifically including: Obtain the equipment parameters of the target electric arc furnace; The geometry of the target electric arc furnace is modeled based on the equipment parameters to obtain a geometric model; the geometric model is used to characterize the relationship between the volume and height of the molten pool in the target electric arc furnace.

4. The electric arc furnace tapping control method according to claim 1, characterized in that, When smelting this specific steel grade, the total height of the slag and molten steel and the slag density are obtained after the slag in the target electric arc furnace has reached a constant value. Specifically, this includes: When smelting this specific steel grade, after the slag in the target electric arc furnace has reached a constant level, a camera is used to capture the total height of the slag and molten steel in the target electric arc furnace. When smelting this specific steel grade, after the slag in the target electric arc furnace is kept constant, a sampler is used to determine the slag density in the target electric arc furnace.

5. The electric arc furnace tapping control method according to claim 1, characterized in that, Obtain the density of molten steel after the slag in the target electric arc furnace has reached a constant level, as well as the total weight of the slag and molten steel. Specifically, this includes: After the slag in the target electric arc furnace is kept constant, a sampler is used to determine the density of the molten steel in the target electric arc furnace. After the slag in the target electric arc furnace is kept constant, the total weight of the slag and molten steel in the target electric arc furnace is determined by a weight sensor installed at the bottom of the target electric arc furnace.

6. The electric arc furnace tapping control method according to claim 1, characterized in that, The formula for calculating the volume of the molten steel is: ； in, V 3 indicates the volume of molten steel; m 3 indicates the total weight; V 1 represents the total volume; ρ 1 indicates the density of the slag; ρ 2 represents the density of molten steel.

7. The electric arc furnace tapping control method according to claim 1, characterized in that, The slag-gold interface height of the target electric arc furnace is calculated based on the molten steel volume and the geometric model, specifically including: The slag-metal interface surface area of ​​the target electric arc furnace is calculated based on the aforementioned geometric model; the formula for calculating the slag-metal interface surface area is as follows: ； in, This represents the surface area of ​​the slag-metal interface; D Indicates the diameter of the molten pool in the target electric arc furnace; The slag-gold interface height of the target electric arc furnace is calculated based on the molten steel volume and the slag-gold interface surface area; the formula for calculating the slag-gold interface height is: ； in, Indicates the height of the gold interface; V 3 indicates the volume of molten steel.

8. A steel tapping control system for an electric arc furnace, characterized in that, include: The model building module is used to build the geometric model of the target electric arc furnace; The upper limit determination module determines the upper limit of total height, upper limit of total weight, and upper limit of slag-gold interface based on the material ratio scheme under the optimal smelting conditions for a specific steel grade. The upper limit of the total height is the maximum height that the slag can reach when the target electric arc furnace is smelted with the best material ratio under optimal smelting conditions; the upper limit of the total weight is the total weight of molten steel and slag in the furnace when the molten steel reaches the tapping spout and begins to be tapped when the target electric arc furnace is smelted with the best material ratio under optimal smelting conditions; the upper limit of the slag-gold interface is the height of the slag-gold interface measured when the target electric arc furnace begins to tap slag under optimal smelting conditions and with the best material ratio. The slag parameter acquisition module is used to obtain the total height and slag density of slag and molten steel after the slag in the target electric arc furnace is kept constant when smelting this specific steel grade. The total volume calculation module is used to calculate the total volume of slag and molten steel in the target electric arc furnace using the total height. The total weight acquisition module is used to obtain the density of molten steel after the slag in the target electric arc furnace is kept constant, as well as the total weight of slag and molten steel. A molten steel volume calculation module is used to calculate the volume of molten steel based on the slag density, the total volume, the molten steel density, and the total weight. The slag-metal interface height calculation module is used to calculate the slag-metal interface height of the target electric arc furnace based on the molten steel volume and the geometric model. The steel tapping control module is used to control the steel tapping time based on the total height, the upper limit of the total height, the total weight, the upper limit of the total weight, the height of the slag-metal interface, and the upper limit of the slag-metal interface. The formula for calculating the total volume is: ； in, h 1 represents the total height of slag and molten steel. , , , , All are constants.

9. An electronic device, characterized in that, The device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the electric arc furnace tapping control method according to any one of claims 1 to 7.

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