Production rhythm control method, device and equipment for electric furnace steelmaking

Abstract

The invention provides a production rhythm control method, device and equipment for electric furnace steelmaking, and relates to the technical field of electric furnace steelmaking. The method comprises the steps that the casting blank speed and the waste steel melting rate of a continuous casting machine and the maximum allowable temperature drop, the effective temperature rise power and the maximum temperature rise rate of a ladle refining furnace are obtained; according to the maximum allowable temperature drop and the effective temperature rise power of the ladle refining furnace, the predicted scrap steel adding amount is determined; determining upper and lower limit values of the scrap steel adding speed according to the predicted scrap steel adding amount, the casting blank speed, the maximum temperature rise rate and the scrap steel melting rate; within the range of the upper limit value and the lower limit value, the first preset scrap steel amount is added into the ladle refining furnace according to the first speed, and the second preset scrap steel amount is added into the ladle refining furnace according to the second speed; in the steel scrap adding process, the casting blank speed is monitored, and when the change amplitude of the casting blank speed exceeds a set threshold value, the first speed, the second speed, the first preset steel scrap amount and the second preset steel scrap amount are adjusted. The problem that the production rhythm is not matched in the electric furnace steelmaking process can be solved.

Description

Technical Field

[0001] This invention relates to the field of electric arc furnace steelmaking technology, and in particular to a method, apparatus and equipment for controlling the production rhythm of electric arc furnace steelmaking. Background Technology

[0002] The electric arc furnace (EAF) steelmaking process typically includes the following core steps: primary refining in the EAF → refining in a ladle furnace (LF) → casting in a continuous casting machine → subsequent cooling and rolling. A significant production bottleneck in this process is the mismatch between the production rhythms of the preceding and following steps.

[0003] Early Stage Processes (Electric Furnace Primary Refining and LF Furnace Refining): To ensure the purity, precise chemical composition, and ideal casting temperature of the final molten steel, the primary and refining processes require strict operational control. This includes electric arc melting, decarburization and dephosphorization during the oxidation period, alloying and deoxidation during the reduction period, slag system adjustment, and precise temperature control. These complex and delicate operations significantly extend the processing time, resulting in a relatively slow production pace for the early stages.

[0004] Later stages (continuous casting): In contrast, once the continuous casting machine is started, its production pace accelerates significantly. Continuous casting is a continuous process that requires molten steel to be injected into the crystallizer at a stable and matched rate and solidify to achieve efficient and stable billet production. Its inherent continuous nature determines its high-speed operation.

[0005] This difference in pace, characterized by a "slow start and fast finish," directly leads to bottlenecks in process coordination. The LF furnace struggles to continuously and stably supply qualified molten steel at the high rate required by the continuous casting machine, thus hindering the improvement of overall production efficiency. Summary of the Invention

[0006] This invention provides a method, apparatus, and equipment for controlling the production rhythm of electric arc furnace steelmaking, in order to solve the problem of mismatched production rhythms during the electric arc furnace steelmaking process.

[0007] In a first aspect, embodiments of the present invention provide a method for controlling the production rhythm of electric arc furnace steelmaking, comprising: The billet speed of the continuous casting machine, the scrap melting rate, the maximum allowable temperature drop, the effective heating power, and the maximum temperature rise rate of the ladle refining furnace were obtained respectively. The expected amount of scrap steel to be added to the ladle refining furnace is determined based on the maximum allowable temperature drop and effective heating power of the ladle refining furnace. The upper and lower limits of the scrap addition rate are determined based on the expected scrap addition amount, the billet casting speed, the maximum temperature rise rate, and the scrap melting rate. Within the specified upper and lower limits, a first preset amount of scrap steel is added to the ladle refining furnace at a first speed, and a second preset amount of scrap steel is added to the ladle refining furnace at a second speed; wherein, the sum of the first preset amount of scrap steel and the second preset amount of scrap steel is the expected amount of scrap steel added, and the first preset amount of scrap steel is greater than the second preset amount of scrap steel; the first speed is greater than the second speed; During the process of adding scrap steel, the billet speed of the continuous casting machine is monitored in real time. When the change in the billet speed exceeds a set threshold, the first speed, the second speed, the first preset scrap steel addition amount, and the second preset scrap steel amount are adjusted according to the current billet speed.

[0008] In one possible implementation, determining the upper and lower limits of the scrap addition rate based on the expected scrap addition amount, the billet casting speed, the maximum temperature rise rate, and the scrap melting rate includes: Based on the billet casting speed, the maximum allowable steelmaking time of the ladle refining furnace is determined, and based on the maximum allowable steelmaking time and the expected amount of scrap steel added, the lower limit of the scrap steel addition rate is determined. Based on the maximum temperature rise rate, determine the first maximum allowable scrap steel addition rate at the maximum temperature rise rate; Based on the scrap steel melting rate, determine the second maximum allowable scrap steel addition rate at the scrap steel melting rate; The minimum value between the first maximum allowable scrap steel addition speed and the second maximum allowable scrap steel addition speed is determined as the upper limit value of the scrap steel addition speed.

[0009] In one possible implementation, determining the lower limit of the scrap addition rate based on the maximum allowable steelmaking time and the expected amount of scrap added includes: Obtain the time percentage corresponding to the addition of scrap steel to the melting stage, and multiply the time percentage by the maximum allowable steelmaking time to determine the scrap steel addition melting time; The ratio of the expected amount of scrap steel added to the melting time of the scrap steel is determined as the lower limit of the scrap steel addition rate.

[0010] In one possible implementation, determining the first maximum permissible scrap steel addition rate at the maximum temperature rise rate, based on the maximum temperature rise rate, includes: The amount of molten steel, heat loss coefficient, and specific heat capacity of molten steel in the ladle refining furnace are obtained, and the product of the maximum temperature rise rate, the amount of molten steel in the ladle refining furnace, the heat loss coefficient, and the specific heat capacity of molten steel is calculated. The product is then determined as the maximum effective thermal efficiency of the ladle refining furnace. The total heat consumption of scrap steel melting is obtained, and the ratio of the maximum effective thermal efficiency to the total heat consumption of scrap steel melting is determined as the first maximum allowable scrap steel addition rate.

[0011] In one possible implementation, determining the second maximum allowable scrap addition rate based on the scrap melting rate includes: The product of the scrap steel melting rate and the amount of molten steel in the ladle refining furnace is determined as the second maximum allowable scrap steel addition rate.

[0012] In one possible implementation, determining the expected scrap steel input to the ladle refining furnace based on the maximum allowable temperature drop and effective heating power of the ladle refining furnace includes: The amount of molten steel in the ladle refining furnace is obtained, and the first maximum amount of scrap steel to be added within the maximum allowable temperature drop is determined based on the maximum allowable temperature drop and the amount of molten steel. The second maximum amount of scrap steel added under the effective heating power is determined based on the effective heating power of the ladle refining furnace; The minimum value between the first maximum scrap steel addition amount and the second maximum scrap steel addition amount is determined as the expected scrap steel addition amount.

[0013] In one possible implementation, determining the first maximum amount of scrap steel added within the maximum allowable temperature drop based on the maximum allowable temperature drop and the amount of molten steel includes: Obtain the heat loss coefficient, specific heat capacity of molten steel and total heat consumption of scrap steel melting, and calculate the product of the maximum allowable temperature drop, the amount of molten steel and the specific heat capacity of molten steel, and determine the product as the maximum heat release of molten steel; Calculate the product of the heat loss coefficient and the total heat consumption of the scrap steel melting, and determine the product as the actual heat absorption per unit of scrap steel; The first maximum amount of scrap steel added is determined based on the ratio of the maximum heat release of the molten steel to the actual heat absorption of the unit scrap steel.

[0014] In one possible implementation, determining the second maximum scrap steel addition amount under the effective heating power of the ladle refining furnace includes: The total heat production of the ladle refining furnace within the maximum allowable steelmaking time is determined by multiplying the effective heating power and the maximum allowable steelmaking time. Obtain the target temperature required for refining in the ladle refining furnace and the current temperature of the ladle refining furnace, and calculate the temperature difference between the target temperature and the current temperature; The amount of heat required to raise the temperature of the ladle refining furnace is determined by multiplying the amount of molten steel in the ladle refining furnace, the temperature difference, and the specific heat capacity of the molten steel. The second maximum amount of scrap steel added is determined based on the difference between the total heat energy produced and the heat required to raise the temperature of the ladle refining furnace, as well as the total heat consumption for scrap steel melting.

[0015] Secondly, embodiments of the present invention provide a production rhythm control device for electric arc furnace steelmaking, comprising: The acquisition module is used to acquire the billet speed of the continuous casting machine, the scrap melting rate, the maximum allowable temperature drop, the effective heating power, and the maximum temperature rise rate of the ladle refining furnace, respectively. The calculation module is used for: The expected amount of scrap steel to be added to the ladle refining furnace is determined based on the maximum allowable temperature drop and effective heating power of the ladle refining furnace. The upper and lower limits of the scrap addition rate are determined based on the expected scrap addition amount, the billet casting speed, the maximum temperature rise rate, and the scrap melting rate. The control module is used to add a first preset amount of scrap steel into the ladle refining furnace at a first speed within the upper and lower limits, and add a second preset amount of scrap steel into the ladle refining furnace at a second speed; wherein the sum of the first preset amount of scrap steel and the second preset amount of scrap steel is the expected amount of scrap steel added, and the first preset amount of scrap steel is greater than the second preset amount of scrap steel; the first speed is greater than the second speed; During the process of adding scrap steel, the billet speed of the continuous casting machine is monitored in real time. When the change in the billet speed exceeds a set threshold, the first speed, the second speed, the first preset scrap steel amount, and the second preset scrap steel amount are adjusted according to the current billet speed.

[0016] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method described in the first aspect or any possible implementation thereof.

[0017] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the first aspect or any possible implementation thereof.

[0018] Fifthly, embodiments of the present invention provide a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect or any possible implementation thereof.

[0019] This invention, by directly adding scrap steel into the LF furnace, can significantly shorten the primary refining time of the electric arc furnace (EAF), improve the production rhythm in the early stages of EAF steelmaking, and effectively alleviate the problem of mismatched production rhythms. However, considering that directly adding a large amount of scrap steel into the LF furnace may cause a sudden drop in temperature and prevent the scrap steel from melting, thus leading to a decrease in the refining quality of the LF furnace, this invention determines the amount of scrap steel added based on the maximum allowable temperature drop and effective heating power of the LF furnace to reasonably control the amount of scrap steel added. Furthermore, this invention also determines the upper and lower limits of the scrap steel addition speed based on the billet speed, the maximum temperature rise rate, and the scrap steel melting rate, thereby ensuring that the scrap steel addition speed matches the billet speed of the continuous casting machine and avoiding problems such as sudden temperature drops and inability to melt the scrap steel in time due to the addition speed. In addition, this invention also adopts a staged addition strategy: in the early stage of scrap steel addition, most of the scrap steel is added at a faster rate to fully utilize the high-temperature molten steel in the LF furnace to accelerate the melting of the scrap steel and improve overall efficiency; in the later stage of scrap steel addition, the remaining scrap steel is added at a slower rate to avoid excessive temperature drops that could affect the refining quality.

[0020] Furthermore, this embodiment of the invention also takes into account the possibility that the billet speed of the continuous casting machine may fluctuate, thereby affecting the production rhythm. Therefore, this embodiment of the invention dynamically adjusts the scrap steel addition speed and scrap steel addition amount at each stage when the change in billet speed exceeds a set threshold, so as to ensure a stable production rhythm. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the implementation of the production rhythm control method for electric arc furnace steelmaking provided in this embodiment of the invention. Figure 2 This is a flowchart illustrating the implementation of the method for determining the upper and lower limits of scrap steel addition speed provided in this embodiment of the invention. Figure 3 This is a schematic diagram of the production rhythm control device for electric arc furnace steelmaking provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] In the electric arc furnace (EAF) steelmaking process, the production pace of the initial EAF primary refining and LF furnace refining processes is relatively slow. However, the production pace of the later continuous casting process is very fast, leading to problems in the connection between these processes. The LF furnace struggles to continuously and stably supply qualified molten steel at the high rate required by the continuous casting machine, thus hindering the improvement of overall production efficiency.

[0024] To ensure a proper match between the production rhythms of the electric arc furnace (EAF) steelmaking process, this invention proposes adding scrap steel directly into the LF furnace. This significantly shortens the initial refining time, improves the production rhythm in the early stages of EAF steelmaking, and effectively alleviates the problem of mismatched production rhythms. However, considering that adding a large amount of scrap steel directly into the LF furnace may cause a sudden drop in furnace temperature and prevent timely melting of the scrap, leading to a decline in the refining quality of the LF furnace, this invention also determines the upper and lower limits of the expected scrap steel addition amount and addition rate based on parameters such as the maximum allowable temperature drop of the LF furnace, the billet speed of the continuous casting machine with effective heating power, the maximum temperature rise rate, and the scrap steel melting rate. This ensures a match between the production rhythms of the preceding and following stages while maintaining the quality of the molten steel.

[0025] In addition, to further achieve a balance between steel quality and early production efficiency, this embodiment of the invention also adopts a phased addition strategy. In the early stage of scrap steel addition, most of the scrap steel is added at a faster rate to make full use of the high-temperature molten steel in the LF furnace to accelerate the melting of the scrap steel and improve overall efficiency. In the later stage of scrap steel addition, the remaining scrap steel is added at a slower rate to avoid excessive temperature drop, which would affect the refining quality.

[0026] See Figure 1 The document illustrates a flowchart of the production rhythm control method for electric arc furnace steelmaking provided in an embodiment of the present invention, which is described in detail below: Step 101: Obtain the billet speed of the continuous casting machine, the scrap melting rate, the maximum allowable temperature drop of the ladle refining furnace, the effective heating power, and the maximum temperature rise rate.

[0027] Here, the billet speed of the continuous casting machine reflects its production rhythm. The scrap melting rate reflects the LF furnace's ability to melt scrap. The maximum allowable temperature drop of the LF furnace reflects its tolerance for temperature drops caused by scrap. The effective heating power and maximum temperature rise rate of the LF furnace reflect its heating capacity.

[0028] Based on the above parameters, the embodiments of the present invention mainly determine the expected amount of scrap steel to be added and the scrap steel addition rate from three aspects: production rhythm, whether the scrap steel can be melted in time, and whether the scrap steel will cause a sudden drop in temperature in the LF furnace.

[0029] Step 102: Determine the expected amount of scrap steel to be added to the ladle refining furnace based on the maximum allowable temperature drop and effective heating power of the ladle refining furnace.

[0030] Here, based on the maximum allowable temperature drop, the maximum amount of scrap steel that the LF furnace can withstand can be determined under the constraint of the maximum allowable temperature drop. Based on the effective heating power, the maximum amount of scrap steel that the LF furnace can withstand can be determined under the constraint of the LF furnace's heating capacity. The minimum of the maximum amount of scrap steel that can be added under both constraints is the expected amount of scrap steel to be added.

[0031] Step 103: Determine the upper and lower limits of the scrap addition rate based on the expected scrap addition amount, billet speed, maximum temperature rise rate, and scrap melting rate.

[0032] The billet speed reflects the production rhythm of the continuous casting machine. In this embodiment of the invention, based on the expected amount of scrap added and the billet speed, a scrap addition speed that matches the production rhythm of the continuous casting machine can be determined. This speed is the lower limit of the scrap addition speed.

[0033] In this embodiment of the invention, under the constraint of the maximum temperature rise rate of the LF furnace, the maximum scrap steel addition rate that avoids the problem of sudden temperature drops can be determined. Similarly, under the constraint of the scrap steel melting rate, the maximum scrap steel addition rate that avoids the problem of scrap steel not melting in time can also be determined. The minimum value of the maximum scrap steel addition rate under the two constraints is the upper limit value of the scrap steel addition rate.

[0034] Step 104: Within the upper and lower limits, add the first preset amount of scrap steel into the ladle refining furnace at the first speed, and add the second preset amount of scrap steel into the ladle refining furnace at the second speed; wherein, the sum of the first preset amount of scrap steel and the second preset amount of scrap steel is the expected amount of scrap steel added, and the first preset amount of scrap steel is greater than the second preset amount of scrap steel; the first speed is greater than the second speed.

[0035] The steelmaking process in an LF furnace mainly consists of two stages: scrap steel addition and melting, and steel refining. After the scrap steel addition and melting are complete, the LF furnace performs steel refining. In the early stages of scrap steel addition, the temperature of the molten steel in the LF furnace is relatively high, so the scrap steel addition rate can be appropriately increased to accelerate the melting of the scrap steel using the high-temperature molten steel. For example, the initial preset amount of scrap steel can account for a large portion of the expected scrap steel addition (e.g., 60%~80%). In the middle and later stages of scrap steel addition, the scrap steel addition rate can be reduced to avoid excessive temperature drop in the later stages, which could affect the quality of subsequent steel refining.

[0036] In the process of adding scrap steel, the temperature drop and scrap steel melting of the LF furnace can be monitored in real time, and the scrap steel addition speed can be finely adjusted in real time based on the temperature drop and scrap steel melting.

[0037] Here, the electric arc heating function of the LF furnace can be activated simultaneously with the addition of scrap steel to prevent a sudden drop in temperature after the scrap steel is added, and it can even raise the temperature of the LF furnace. In addition, electromagnetic stirring or bottom-blowing argon stirring can be performed during the scrap steel addition process to accelerate the heat exchange between the scrap steel and the molten steel and increase the melting rate.

[0038] In this embodiment of the invention, the scrap steel added directly into the LF furnace can be small-sized, clean scrap steel to minimize the steelmaking time in the LF furnace. Furthermore, the scrap steel can be pre-dried to prevent explosion hazards.

[0039] Here, clean scrap steel can be block-shaped scrap steel with a content of harmful elements (such as P, S, Pb, etc.) ≤0.05%, free from rust and oil stains. Among them, the size of the scrap steel is less than or equal to 100mm.

[0040] This application allows for the pre-sorting of scrap steel to remove enclosed cavities, flammable and explosive materials, and other scrap steel that poses an explosion risk. Based on this, further screening yields block-shaped scrap steel with a size of 100mm or less, a harmful element (e.g., P, S, Pb) content ≤0.05%, and free from rust and oil stains.

[0041] Step 105: During the process of adding scrap steel, the billet speed of the continuous casting machine is monitored in real time. When the change in billet speed exceeds the set threshold, the first speed, the second speed, the first preset scrap steel amount, and the second preset scrap steel amount are adjusted according to the current billet speed.

[0042] Considering that the billet speed of a continuous casting machine is not absolutely stable and may fluctuate due to various factors, and that changes in billet speed directly affect the production rhythm, thereby affecting the scrap steel addition strategy determined in step 104, this embodiment of the invention monitors the billet speed of the continuous casting machine in real time during the scrap steel addition operation according to the scrap steel addition strategy determined in step 104, and adjusts the scrap steel addition strategy when the change in billet speed exceeds a set threshold. Here, adjusting the scrap steel addition strategy mainly refers to adjusting the first speed, the second speed, the first preset scrap steel amount, and the second preset scrap steel amount.

[0043] The variation range of the casting speed can be expressed as: .in, This indicates the range of change in the casting speed. This indicates the billet casting speed monitored in real time during the scrap steel addition process. This indicates the billet casting speed when formulating or adjusting the scrap steel addition strategy. Specifically, during the first strategy adjustment... This represents the billet speed when the scrap steel addition strategy is formulated (i.e., the initial billet speed obtained in step 101). During the Nth strategy adjustment, This represents the billet casting speed at the time of the last adjustment of the scrap steel strategy. N is an integer greater than or equal to 2.

[0044] Here, the threshold can be set according to the actual situation. For example, the threshold can be set to 10%.

[0045] It should be noted that the adjusted first speed, second speed, first preset scrap amount, and second preset scrap amount meet the requirements that the first speed is greater than the second speed and the proportion of the first preset scrap amount is greater than the proportion of the second preset scrap amount, thereby ensuring that while improving overall efficiency, the refining quality is not affected.

[0046] The percentage of the first preset scrap steel quantity refers to the proportion of the first preset scrap steel quantity to the total expected scrap steel input. Similarly, the percentage of the second preset scrap steel quantity refers to the proportion of the second preset scrap steel quantity to the total expected scrap steel input.

[0047] It is understood that the present invention adjusts the strategy when the change in the billet speed exceeds a set threshold, which can prevent the strategy adjustment from being too frequent and thus ensure stability.

[0048] This invention, by directly adding scrap steel into the LF furnace, can significantly shorten the primary refining time of the electric arc furnace (EAF), improve the production rhythm in the early stages of EAF steelmaking, and effectively alleviate the problem of mismatched production rhythms. However, considering that directly adding a large amount of scrap steel into the LF furnace may cause a sudden drop in temperature and prevent the scrap steel from melting, thus leading to a decrease in the refining quality of the LF furnace, this invention determines the amount of scrap steel added based on the maximum allowable temperature drop and effective heating power of the LF furnace to reasonably control the amount of scrap steel added. Furthermore, this invention also determines the upper and lower limits of the scrap steel addition speed based on the billet speed, the maximum temperature rise rate, and the scrap steel melting rate, thereby ensuring that the scrap steel addition speed matches the billet speed of the continuous casting machine and avoiding problems such as sudden temperature drops and inability to melt the scrap steel in time due to the addition speed. In addition, this invention also adopts a staged addition strategy: in the early stage of scrap steel addition, most of the scrap steel is added at a faster rate to fully utilize the high-temperature molten steel in the LF furnace to accelerate the melting of the scrap steel and improve overall efficiency; in the later stage of scrap steel addition, the remaining scrap steel is added at a slower rate to avoid excessive temperature drops that could affect the refining quality.

[0049] Furthermore, this embodiment of the invention also takes into account the possibility that the billet speed of the continuous casting machine may fluctuate, thereby affecting the production rhythm. Therefore, this embodiment of the invention dynamically adjusts the scrap steel addition speed and scrap steel addition amount at each stage when the change in billet speed exceeds a set threshold, so as to ensure a stable production rhythm.

[0050] The following section details the specific method for determining the expected amount of scrap steel to be added.

[0051] In some embodiments, when determining the expected scrap steel addition amount, the amount of molten steel in the ladle refining furnace can be obtained first, and the first maximum scrap steel addition amount within the maximum allowable temperature drop can be determined based on the maximum allowable temperature drop and the amount of molten steel; then, the second maximum scrap steel addition amount under the effective heating power can be determined based on the effective heating power of the ladle refining furnace; finally, the minimum value between the first maximum scrap steel addition amount and the second maximum scrap steel addition amount is determined as the expected scrap steel addition amount.

[0052] In some embodiments, when determining the first maximum amount of scrap steel to be added, the heat loss coefficient, the specific heat capacity of molten steel, and the total heat consumption of scrap steel melting can be obtained, and the product of the maximum allowable temperature drop, the amount of molten steel, and the specific heat capacity of molten steel can be calculated, and the product is determined as the maximum heat release of molten steel; then, the product of the heat loss coefficient and the total heat consumption of scrap steel melting is calculated, and the product is determined as the actual heat absorption per unit of scrap steel; finally, the first maximum amount of scrap steel to be added is determined according to the ratio of the maximum heat release of molten steel to the actual heat absorption per unit of scrap steel.

[0053] The maximum amount of scrap steel that can be added can be expressed mathematically as follows: ; in, This indicates the maximum amount of scrap steel added. This indicates the maximum permissible temperature drop, typically 30~60℃. This indicates the amount of molten steel in the LF furnace. This indicates the specific heat capacity of molten steel. Indicates the heat loss coefficient. This indicates the total heat consumption for melting scrap steel. Under normal temperature conditions, the total heat consumption for melting scrap steel is approximately 1260 kJ / kg.

[0054] Here, the total heat consumption for scrap steel melting includes: the solid-state enthalpy of heating scrap steel from room temperature to its melting point, the latent heat of fusion, and the liquid-state enthalpy of heating scrap steel from its melting point to the target temperature. The target temperature refers to the target molten steel temperature refined in the LF furnace.

[0055] Here, the heat loss coefficient This is the ratio of the actual temperature drop to the theoretical temperature drop, and is an empirical parameter. Its specific value depends on equipment conditions (such as furnace lining thickness and sealing) and operating conditions (such as stirring intensity). Those skilled in the art can calibrate it based on field data: experimentally measure the actual temperature drop before and after adding scrap steel, compare it with the theoretical temperature drop, and then calculate the result. value.

[0056] The formula for calculating the theoretical temperature drop can be expressed as: .in, Indicates the theoretical temperature drop. This indicates the amount of scrap steel added.

[0057] For example, under normal operating conditions, the heat loss coefficient can range from 1.1 to 1.3.

[0058] Here, the maximum permissible temperature drop molten steel volume Specific heat capacity of molten steel The product of these can reflect the maximum heat release of molten steel in the LF furnace. (Heat loss coefficient) Total heat consumption of scrap steel melting The product of these two values ​​can reflect the actual heat absorption per unit of scrap steel. Based on the principle of heat absorption and release balance, this embodiment of the invention determines the ratio of the maximum heat release of molten steel to the actual heat absorption per unit of scrap steel as the first maximum amount of scrap steel to be added.

[0059] In some embodiments, when determining the second maximum scrap addition amount, the total heat energy generated by the ladle refining furnace during the maximum allowable steelmaking time can be determined based on the product of the effective heating power and the maximum allowable steelmaking time. Next, the target temperature required for refining in the ladle refining furnace and the current temperature of the ladle refining furnace are obtained, and the temperature difference between the target temperature and the current temperature is calculated. Subsequently, the heat required to raise the temperature of the ladle refining furnace is determined based on the product of the amount of molten steel in the ladle refining furnace, the temperature difference, and the specific heat capacity of the molten steel. Finally, the second maximum scrap addition amount is determined based on the difference between the total heat energy generated and the heat required to raise the temperature of the ladle refining furnace, as well as the total heat consumption for scrap melting.

[0060] The mathematical expression for the second maximum amount of scrap steel added can be expressed as:

[0061] in, This indicates the second largest amount of scrap steel added. P Indicates the effective heating power. Indicates the maximum permissible steelmaking time. Indicates the target temperature. This indicates the current temperature.

[0062] Here, the product of the effective heating power and the maximum allowable steelmaking time is the total heat energy generated by the LF furnace within the maximum allowable steelmaking time. The product of the amount of molten steel, the temperature difference, and the specific heat capacity of the molten steel in the ladle refining furnace is the heat required for the ladle refining furnace to heat up from the current temperature to the target temperature required for refining. The total heat consumption for scrap melting is used to characterize the heat absorption requirement per unit of scrap steel. The ratio of the difference between the total heat energy generated and the heat required for heating the LF furnace to the total heat consumption for scrap melting is the second maximum amount of scrap steel added.

[0063] Here, the maximum permissible steelmaking time can be determined based on the billet speed of the continuous casting machine. Specifically, the electric arc furnace (EAF) steelmaking process is equipped with two LF furnaces operating alternately. One LF furnace receives molten steel from the EAF and directly adds scrap steel, performing steel refining. The other LF furnace completes the steel refining and pours the steel into the continuous casting machine. When determining the maximum permissible steelmaking time, the steel consumption of the continuous casting machine per unit time can be determined first based on the billet speed. Then, the ratio of the amount of molten steel in the other LF furnace (i.e., the LF furnace that completes steel refining and supplies molten steel to the continuous casting machine) to the steel consumption can be used to determine the maximum permissible steelmaking time of the current LF furnace.

[0064] The steel consumption per unit time of a continuous casting machine can be expressed as: ; in, This indicates the amount of molten steel consumed by the continuous casting machine per unit time. Indicates the casting speed, Indicates the cross-sectional area of ​​the cast billet. This indicates the density of molten steel. N This indicates the number of continuous casting machine streams.

[0065] After determining the expected amount of scrap steel to be added as described above, see [link to relevant documentation]. Figure 2 This invention further determines the upper and lower limits of the scrap steel addition rate. Specifically: Step 201: Based on the billet casting speed, determine the maximum allowable steelmaking time of the ladle refining furnace, and based on the maximum allowable steelmaking time and the expected scrap addition amount, determine the lower limit of the scrap addition rate. The method for determining the maximum permissible steelmaking time is described above and will not be repeated here. Based on determining the maximum permissible steelmaking time, this embodiment of the invention further determines a lower limit for the scrap steel addition rate. Specifically, the time percentage corresponding to the scrap steel addition and melting stage is obtained, and the product of this time percentage and the maximum permissible steelmaking time is determined as the scrap steel addition and melting time. Then, the ratio of the expected scrap steel addition amount to the scrap steel addition and melting time is determined as the lower limit for the scrap steel addition rate.

[0066] The steelmaking process in the LF furnace is mainly divided into the scrap steel addition and melting stage and the molten steel refining stage. To ensure refining quality, the time allocated to the scrap steel addition and melting stage can be reduced, allowing sufficient time for the molten steel refining stage. For example, the time allocated to the scrap steel addition and melting stage can be less than or equal to 0.3%, thus fully guaranteeing refining quality.

[0067] In this embodiment of the invention, the product of the time percentage and the maximum allowable steelmaking time is determined as the scrap steel addition and melting time. Then, the ratio of the expected scrap steel addition amount to the scrap steel addition and melting time is calculated and determined as the lower limit of the scrap steel addition rate, so that the LF furnace can match the production rhythm of the continuous casting machine.

[0068] Step 202: Determine the first maximum allowable scrap steel addition rate at the maximum temperature rise rate based on the maximum temperature rise rate; In some embodiments, when determining the first maximum allowable scrap addition rate, the amount of molten steel, heat loss coefficient, and specific heat capacity of molten steel in the ladle refining furnace can be obtained, and the product of the maximum temperature rise rate, the amount of molten steel, heat loss coefficient, and specific heat capacity of molten steel in the ladle refining furnace can be calculated. The product is then determined as the maximum effective thermal efficiency of the ladle refining furnace. Next, the total heat consumption for scrap melting is obtained, and the ratio of the maximum effective thermal efficiency to the total heat consumption for scrap melting is determined as the first maximum allowable scrap addition rate.

[0069] The mathematical expression for the first maximum allowable scrap steel addition rate can be expressed as:

[0070] in, This indicates the first maximum permissible rate of scrap steel addition. This indicates the maximum rate of temperature rise.

[0071] Step 203: Determine the second maximum allowable scrap steel addition rate based on the scrap steel melting rate; The scrap melting rate can be understood as the upper limit of scrap that can be melted by molten steel per unit time. Based on this, the embodiments of the present invention directly determine the product of the scrap melting rate and the amount of molten steel as the second maximum allowable scrap addition rate under the constraint of the scrap melting rate.

[0072] Step 204: The minimum value between the first maximum allowable scrap steel addition speed and the second maximum allowable scrap steel addition speed is determined as the upper limit value of the scrap steel addition speed.

[0073] In this embodiment of the invention, a first maximum permissible scrap steel addition rate is determined based on a temperature rise rate constraint, and a second maximum permissible scrap steel addition rate is determined based on a scrap steel melting rate constraint. By comprehensively considering both the maximum temperature rise rate constraint and the scrap steel melting rate constraint, the minimum of the two is determined as the upper limit of the scrap steel addition rate.

[0074] Based on the above determination of the upper and lower limits of the expected scrap steel addition amount and scrap steel addition rate, and thus the determination of the initial scrap steel addition strategy, this embodiment of the invention further introduces a method for adjusting the scrap steel addition strategy when the billet speed changes during the scrap steel addition process.

[0075] As can be seen from the above, changes in the billet casting speed directly affect the maximum allowable steelmaking time, which in turn affects the lower limit of the expected amount of scrap steel added and the scrap steel addition speed.

[0076] Specifically, when the change in billet speed exceeds a set threshold, the maximum allowable steelmaking time of the ladle refining furnace can be re-determined based on the current billet speed. Then, based on the new maximum allowable steelmaking time, the second maximum scrap steel addition amount is re-determined to determine whether the expected scrap steel addition amount should be updated. Here, whether the expected scrap steel addition amount is updated depends on the relationship between the first maximum scrap steel addition amount and the new second maximum scrap steel addition amount.

[0077] Subsequently, based on the expected amount of scrap steel added and the maximum allowable steelmaking time, a new lower limit for the scrap steel addition rate is determined. Considering that the billet casting speed does not affect the upper limit for the scrap steel addition rate, this embodiment of the invention does not update the upper limit for the scrap steel addition rate.

[0078] Based on the determination of the new expected amount of scrap steel to be added and the new lower limit value, this embodiment of the invention adjusts the scrap steel addition strategy. Here, the adjustment of the scrap steel addition strategy is mainly reflected in the adjustment of the first speed, the second speed, the first preset amount of scrap steel, and the second preset amount of scrap steel.

[0079] The specific adjustment method is as follows: As the billet casting speed increases, the continuous casting rhythm accelerates. At this point, both the first and second speeds should be increased. The increase in the first speed should be greater than the increase in the second speed (i.e., significantly increase the first speed and appropriately increase the second speed). By significantly increasing the first speed and appropriately increasing the second speed, the scrap melting time can be compressed in the early stages of scrap addition, matching the accelerated continuous casting rhythm. However, considering that the molten steel temperature in the LF furnace is lower in the later stages of scrap addition, the increase in the second speed should not be too large.

[0080] Furthermore, embodiments of the present invention can increase the proportion of the first preset scrap steel amount to the expected scrap steel addition amount, and decrease the proportion of the second preset scrap steel amount to the expected scrap steel addition amount. This maximizes the utilization of the high temperature advantage in the early stage, reduces the scrap steel melting pressure in the later stage, and thus shortens the overall scrap steel addition time to match the accelerated continuous casting rhythm.

[0081] When the billet casting speed decreases, the continuous casting rhythm slows down. At this point, both the first and second speeds are reduced. The reduction in the first speed is less than the reduction in the second speed. For example, the reduction in the first speed can be zero (i.e., a slight reduction or maintenance of the first speed, and a significant reduction in the second speed). By slightly reducing or maintaining the first speed and significantly reducing the second speed, the time for adding scrap steel in the later stages can be extended, avoiding premature reaching of the refining target in the furnace, which would lead to waiting and resource waste.

[0082] Furthermore, embodiments of the present invention can reduce the proportion of the first preset scrap steel amount to the expected scrap steel addition amount and increase the proportion of the second preset scrap steel amount to the expected scrap steel addition amount, thereby extending the overall scrap steel addition time to match the slowed continuous casting rhythm.

[0083] It is understandable that the adjusted first and second speeds are both greater than the lower limit of the new scrap steel addition speed, and both are less than the upper limit of the scrap steel addition speed. The sum of the adjusted first and second preset scrap steel addition amounts is still the expected scrap steel addition amount.

[0084] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0085] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0086] Figure 3 A schematic diagram of the production rhythm control device for electric arc furnace steelmaking provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below: like Figure 3 As shown, the production rhythm control device 3 for electric arc furnace steelmaking includes: an acquisition module 31, a calculation module 32, and a control module 33.

[0087] The acquisition module 31 is used to acquire the billet speed of the continuous casting machine, the scrap melting rate, the maximum allowable temperature drop of the ladle refining furnace, the effective heating power, and the maximum temperature rise rate, respectively. Calculation module 32 is used for: The expected amount of scrap steel to be added to the ladle refining furnace is determined based on the maximum allowable temperature drop and effective heating power of the ladle refining furnace. The upper and lower limits of the scrap addition rate are determined based on the expected scrap addition amount, billet speed, maximum temperature rise rate, and scrap melting rate. Control module 33 is used to add a first preset amount of scrap steel into the ladle refining furnace at a first speed within an upper and lower limit range, and add a second preset amount of scrap steel into the ladle refining furnace at a second speed; wherein, the sum of the first preset amount of scrap steel and the second preset amount of scrap steel is the expected amount of scrap steel added, and the first preset amount of scrap steel is greater than the second preset amount of scrap steel; the first speed is greater than the second speed; During the process of adding scrap steel, the billet speed of the continuous casting machine is monitored in real time. When the change in billet speed exceeds the set threshold, the first speed, the second speed, the first preset scrap steel amount, and the second preset scrap steel amount are adjusted according to the current billet speed.

[0088] In one possible implementation, the calculation module 32 is specifically used for: Based on the billet casting speed, the maximum allowable steelmaking time of the ladle refining furnace is determined, and based on the maximum allowable steelmaking time and the expected scrap addition amount, the lower limit of the scrap addition rate is determined. Determine the first maximum allowable scrap steel addition rate based on the maximum temperature rise rate; Based on the scrap melting rate, determine the second maximum allowable scrap addition rate at the scrap melting rate; The minimum value between the first maximum allowable scrap steel addition speed and the second maximum allowable scrap steel addition speed is determined as the upper limit value of the scrap steel addition speed.

[0089] In one possible implementation, the calculation module 32 is specifically used for: Obtain the time percentage corresponding to the addition of scrap steel to the melting stage, and multiply the time percentage by the maximum allowable steelmaking time to determine the scrap steel addition melting time; The ratio of the expected amount of scrap steel added to the melting time of the scrap steel is determined as the lower limit of the scrap steel addition rate.

[0090] In one possible implementation, the calculation module 32 is specifically used for: Obtain the amount of molten steel, heat loss coefficient, and specific heat capacity of molten steel in the ladle refining furnace, and calculate the product of the maximum temperature rise rate, the amount of molten steel, heat loss coefficient, and specific heat capacity of molten steel in the ladle refining furnace. Determine the product as the maximum effective thermal efficiency of the ladle refining furnace. The total heat consumption of scrap steel melting is obtained, and the ratio of the maximum effective thermal efficiency to the total heat consumption of scrap steel melting is determined as the first maximum allowable scrap steel addition rate.

[0091] In one possible implementation, the calculation module 32 is specifically used for: The product of the scrap melting rate and the amount of molten steel in the ladle refining furnace is determined as the second maximum allowable scrap addition rate.

[0092] In one possible implementation, the calculation module 32 is specifically used for: Obtain the amount of molten steel in the ladle refining furnace, and determine the first maximum amount of scrap steel to be added within the maximum allowable temperature drop based on the maximum allowable temperature drop and the amount of molten steel. The second maximum amount of scrap steel added under the effective heating power is determined based on the effective heating power of the ladle refining furnace. The minimum of the first and second maximum scrap steel addition amounts is determined as the expected scrap steel addition amount.

[0093] In one possible implementation, the calculation module 32 is specifically used for: Obtain the heat loss coefficient, specific heat capacity of molten steel and total heat consumption of scrap steel melting, and calculate the product of the maximum allowable temperature drop, the amount of molten steel and the specific heat capacity of molten steel, and determine the product as the maximum heat release of molten steel; Calculate the product of the heat loss coefficient and the total heat consumption of scrap steel melting, and determine the product as the actual heat absorption per unit of scrap steel; The first maximum amount of scrap steel to be added is determined based on the ratio of the maximum heat release of molten steel to the actual heat absorption per unit of scrap steel.

[0094] In one possible implementation, the calculation module 32 is specifically used for: The total heat production of the ladle refining furnace during the maximum allowable steelmaking time is determined by multiplying the effective heating power and the maximum allowable steelmaking time. Obtain the target temperature required for refining in the ladle refining furnace and the current temperature of the ladle refining furnace, and calculate the temperature difference between the target temperature and the current temperature; The amount of heat required to raise the temperature of the ladle refining furnace is determined by multiplying the amount of molten steel, the temperature difference, and the specific heat capacity of the molten steel in the ladle refining furnace. The second maximum amount of scrap steel to be added is determined based on the difference between the total heat energy produced and the heat required to raise the temperature of the ladle refining furnace, as well as the total heat consumption for scrap steel melting.

[0095] This device embodiment can be used to implement the above-described method embodiment, and its technical principle and implementation effect are the same as those of the above-described method embodiment, so they will not be repeated here.

[0096] Figure 4 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Figure 4 As shown, the electronic device 4 in this embodiment includes a processor 40 and a memory 41. The memory 41 stores a computer program 42. When the processor 40 executes the computer program 42, it implements the steps in the various method embodiments described above. Alternatively, when the processor 40 executes the computer program 42, it implements the functions of each module / unit in the various device embodiments described above.

[0097] For example, computer program 42 may be divided into one or more modules / units, which are stored in memory 41 and executed by processor 40 to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of computer program 42 in electronic device 4.

[0098] Electronic device 4 may include, but is not limited to, processor 40 and memory 41. Those skilled in the art will understand that... Figure 4 This is merely an example of electronic device 4 and does not constitute a limitation on electronic device 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 4 may also include input / output devices, network access devices, buses, etc.

[0099] The processor 40 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0100] The memory 41 can be an internal storage unit of the electronic device 4, such as a hard disk or RAM. The memory 41 can also be an external storage device of the electronic device 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 41 can include both internal and external storage units of the electronic device 4. The memory 41 is used to store the computer program 42 and other programs and data required by the electronic device 4. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0101] For the sake of simplicity and clarity, only the above-described functional modules / units are used as examples. In practical applications, the functions described above can be assigned to different functional modules / units as needed. These modules / units can be implemented in hardware, software, or a combination of both.

[0102] This invention also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0103] This invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the methods described in the above-described method embodiments.

[0104] Computer programs include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0105] In the above embodiments, the descriptions of each embodiment have their own emphasis. Parts not detailed or described in a particular embodiment can be referred to in the relevant descriptions of other embodiments. Unless otherwise specified or in conflict with logic, the terminology and / or descriptions between different embodiments are consistent and can be referenced interchangeably. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0106] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for controlling the production rhythm of electric arc furnace steelmaking, characterized in that, include: The billet speed of the continuous casting machine, the scrap melting rate, the maximum allowable temperature drop, the effective heating power, and the maximum temperature rise rate of the ladle refining furnace were obtained respectively. The expected amount of scrap steel to be added to the ladle refining furnace is determined based on the maximum allowable temperature drop and effective heating power of the ladle refining furnace. The upper and lower limits of the scrap addition rate are determined based on the expected scrap addition amount, the billet casting speed, the maximum temperature rise rate, and the scrap melting rate. Within the specified upper and lower limits, a first preset amount of scrap steel is added to the ladle refining furnace at a first speed, and a second preset amount of scrap steel is added to the ladle refining furnace at a second speed; wherein, the sum of the first preset amount of scrap steel and the second preset amount of scrap steel is the expected amount of scrap steel added, and the first preset amount of scrap steel is greater than the second preset amount of scrap steel; the first speed is greater than the second speed; During the process of adding scrap steel, the billet speed of the continuous casting machine is monitored in real time. When the change in the billet speed exceeds a set threshold, the first speed, the second speed, the first preset scrap steel amount, and the second preset scrap steel amount are adjusted according to the current billet speed.

2. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 1, characterized in that, Based on the expected amount of scrap steel added, the billet casting speed, the maximum temperature rise rate, and the scrap steel melting rate, the upper and lower limits of the scrap steel addition rate are determined, including: Based on the billet casting speed, the maximum allowable steelmaking time of the ladle refining furnace is determined, and based on the maximum allowable steelmaking time and the expected amount of scrap steel added, the lower limit of the scrap steel addition rate is determined. Based on the maximum temperature rise rate, determine the first maximum allowable scrap steel addition rate at the maximum temperature rise rate; Based on the scrap steel melting rate, determine the second maximum allowable scrap steel addition rate at the scrap steel melting rate; The minimum value between the first maximum allowable scrap steel addition speed and the second maximum allowable scrap steel addition speed is determined as the upper limit value of the scrap steel addition speed.

3. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 2, characterized in that, Determining the lower limit of the scrap addition rate based on the maximum allowable steelmaking time and the expected amount of scrap added includes: Obtain the time percentage corresponding to the addition of scrap steel to the melting stage, and multiply the time percentage by the maximum allowable steelmaking time to determine the scrap steel addition melting time; The ratio of the expected amount of scrap steel added to the melting time of the scrap steel is determined as the lower limit of the scrap steel addition rate.

4. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 2 or 3, characterized in that, The step of determining the first maximum permissible scrap steel addition rate at the maximum temperature rise rate, based on the maximum temperature rise rate, includes: The amount of molten steel, the heat loss coefficient, and the specific heat capacity of molten steel in the ladle refining furnace are obtained, and the product of the maximum temperature rise rate, the amount of molten steel in the ladle refining furnace, the heat loss coefficient, and the specific heat capacity of molten steel is calculated. The product is then determined as the maximum effective thermal efficiency of the ladle refining furnace. The total heat consumption of scrap steel melting is obtained, and the ratio of the maximum effective thermal efficiency to the total heat consumption of scrap steel melting is determined as the first maximum allowable scrap steel addition rate.

5. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 2 or 3, characterized in that, The step of determining the second maximum allowable scrap addition rate based on the scrap melting rate includes: The product of the scrap steel melting rate and the amount of molten steel in the ladle refining furnace is determined as the second maximum allowable scrap steel addition rate.

6. The method for controlling the production rhythm of electric arc furnace steelmaking according to any one of claims 1-3, characterized in that, The determination of the expected scrap steel addition amount for the ladle refining furnace based on the maximum allowable temperature drop and effective heating power includes: The amount of molten steel in the ladle refining furnace is obtained, and the first maximum amount of scrap steel to be added within the maximum allowable temperature drop is determined based on the maximum allowable temperature drop and the amount of molten steel. The second maximum amount of scrap steel added under the effective heating power is determined based on the effective heating power of the ladle refining furnace; The minimum value between the first maximum scrap steel addition amount and the second maximum scrap steel addition amount is determined as the expected scrap steel addition amount.

7. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 6, characterized in that, The step of determining the first maximum amount of scrap steel to be added within the maximum allowable temperature drop based on the maximum allowable temperature drop and the amount of molten steel includes: Obtain the heat loss coefficient, specific heat capacity of molten steel and total heat consumption of scrap steel melting, and calculate the product of the maximum allowable temperature drop, the amount of molten steel and the specific heat capacity of molten steel, and determine the product as the maximum heat release of molten steel; Calculate the product of the heat loss coefficient and the total heat consumption of the scrap steel melting, and determine the product as the actual heat absorption per unit of scrap steel; The first maximum amount of scrap steel added is determined based on the ratio of the maximum heat release of the molten steel to the actual heat absorption of the unit scrap steel.

8. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 6, characterized in that, The determination of the second maximum scrap steel addition amount under the effective heating power of the ladle refining furnace includes: The total heat production of the ladle refining furnace within the maximum allowable steelmaking time is determined by multiplying the effective heating power and the maximum allowable steelmaking time. Obtain the target temperature required for refining in the ladle refining furnace and the current temperature of the ladle refining furnace, and calculate the temperature difference between the target temperature and the current temperature; The amount of heat required to raise the temperature of the ladle refining furnace is determined by multiplying the amount of molten steel in the ladle refining furnace, the temperature difference, and the specific heat capacity of the molten steel. The second maximum amount of scrap steel added is determined based on the difference between the total heat energy produced and the heat required to raise the temperature of the ladle refining furnace, as well as the total heat consumption for scrap steel melting.

9. A production rhythm control device for electric arc furnace steelmaking, characterized in that, include: The acquisition module is used to acquire the billet speed of the continuous casting machine, the scrap melting rate, the maximum allowable temperature drop, the effective heating power, and the maximum temperature rise rate of the ladle refining furnace, respectively. The calculation module is used for: The expected amount of scrap steel to be added to the ladle refining furnace is determined based on the maximum allowable temperature drop and effective heating power of the ladle refining furnace. The upper and lower limits of the scrap addition rate are determined based on the expected scrap addition amount, the billet casting speed, the maximum temperature rise rate, and the scrap melting rate. The control module is used to add a first preset amount of scrap steel into the ladle refining furnace at a first speed within the upper and lower limits, and add a second preset amount of scrap steel into the ladle refining furnace at a second speed; wherein the sum of the first preset amount of scrap steel and the second preset amount of scrap steel is the expected amount of scrap steel added, and the first preset amount of scrap steel is greater than the second preset amount of scrap steel; the first speed is greater than the second speed; During the process of adding scrap steel, the billet speed of the continuous casting machine is monitored in real time. When the change in the billet speed exceeds a set threshold, the first speed, the second speed, the first preset scrap steel amount, and the second preset scrap steel amount are adjusted according to the current billet speed.

10. An electronic device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method as described in any one of claims 1 to 8.

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