Method, device and equipment for controlling the production rhythm of an electric arc furnace steelmaking

Abstract

The application 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 following steps: obtaining the casting speed of a continuous casting machine, the scrap steel melting rate, the maximum allowable temperature drop of a ladle refining furnace, the effective temperature rising power and the maximum temperature rising rate; determining the predicted scrap steel addition amount according to the maximum allowable temperature drop and the effective temperature rising power of the ladle refining furnace; determining the upper and lower limit values of the scrap steel addition speed according to the predicted scrap steel addition amount, the casting speed, the maximum temperature rising rate and the scrap steel melting rate; adding a first preset scrap steel amount into the ladle refining furnace at a first speed and adding a second preset scrap steel amount into the ladle refining furnace at a second speed within the range of the upper and lower limit values; and monitoring the casting speed during the process of adding scrap steel, and adjusting the first speed, the second speed, the first preset scrap steel amount and the second preset scrap steel amount when the change amplitude of the casting speed exceeds a set threshold. The application can solve the problem of unmatched production rhythm in the process of electric furnace steelmaking.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric furnace steelmaking, and in particular to an electric furnace steelmaking production rhythm control method, device and equipment. BACKGROUND

[0002] The electric furnace steelmaking process generally includes the following core links: electric furnace initial smelting, ladle furnace (LF) refining, continuous casting machine casting, and subsequent cooling and rolling processing. In this process, a significant production bottleneck is the mismatch between the production rhythms of the preceding and subsequent processes.

[0003] The preceding processes (electric furnace initial smelting and LF furnace refining): In order to ensure the purity, accurate chemical composition and ideal casting temperature of the final molten steel, strict operation control is required during the initial smelting and refining processes. This includes arc melting, decarburization and dephosphorization during the oxidation period, alloying and deoxidation during the reduction period, slag system adjustment, and accurate temperature regulation. These complex and delicate operations significantly prolong the processing time, resulting in a relatively slow production rhythm in the preceding processes.

[0004] The subsequent processes (continuous casting machine casting): In contrast, once the continuous casting machine is started, its production rhythm is significantly accelerated. Continuous casting is a continuous process that requires molten steel to be injected into the crystallizer at a stable and matched speed and solidified into a billet to achieve efficient and stable billet production. Its inherent continuous nature determines its high-speed operation characteristics.

[0005] This difference in rhythm between the slow preceding processes and the fast subsequent processes directly leads to a bottleneck problem in process connection. The LF furnace is difficult to continuously and stably supply qualified molten steel at the required high speed required by the continuous casting machine, which restricts the improvement of overall production efficiency. SUMMARY

[0006] The present application provides an electric furnace steelmaking production rhythm control method, device and equipment to solve the problem of mismatched production rhythm in the electric furnace steelmaking process.

[0007] In a first aspect, the present application provides an electric furnace steelmaking production rhythm control method, comprising:

[0008] obtaining the billet speed of the continuous casting machine, the scrap steel melting rate, the maximum allowable temperature drop of the ladle furnace, the effective temperature rising power and the maximum temperature rising rate of the ladle furnace, respectively;

[0009] determining the predicted scrap steel addition amount of the ladle furnace according to the maximum allowable temperature drop and the effective temperature rising power of the ladle furnace;

[0010] determining the upper and lower limit values of the scrap steel addition speed according to the predicted scrap steel addition amount, the billet speed, the maximum temperature rising rate and the scrap steel melting rate;

[0011] In the range of the upper and lower limit values, the first preset scrap steel amount is added into the ladle refining furnace at a first speed, and the second preset scrap steel amount is added into the ladle refining furnace at a second speed; wherein the sum of the first preset scrap steel amount and the second preset scrap steel amount is the predicted scrap steel addition amount, and the first preset scrap steel amount is greater than the second preset scrap steel amount; the first speed is greater than the second speed;

[0012] In the process of adding scrap steel, the casting speed of the continuous casting machine is monitored in real time, and when the change amplitude of the casting 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 casting speed.

[0013] In a possible implementation, the upper and lower limit values of the scrap steel addition speed are determined according to the predicted scrap steel addition amount, the casting speed, the maximum temperature rise rate and the scrap steel melting rate, comprising:

[0014] The maximum allowed steelmaking time of the ladle refining furnace is determined based on the casting speed, and the lower limit value of the scrap steel addition speed is determined based on the maximum allowed steelmaking time and the predicted scrap steel addition amount;

[0015] The first maximum allowed scrap steel addition speed under the maximum temperature rise rate is determined according to the maximum temperature rise rate;

[0016] The second maximum allowed scrap steel addition speed under the scrap steel melting rate is determined according to the scrap steel melting rate;

[0017] The minimum value of the first maximum allowed scrap steel addition speed and the second maximum allowed scrap steel addition speed is determined as the upper limit value of the scrap steel addition speed.

[0018] In a possible implementation, the lower limit value of the scrap steel addition speed is determined based on the maximum allowed steelmaking time and the predicted scrap steel addition amount, comprising:

[0019] The time proportion corresponding to the scrap steel addition melting stage is obtained, and the product of the time proportion and the maximum allowed steelmaking time is determined as the scrap steel addition melting duration;

[0020] The ratio of the predicted scrap steel addition amount and the scrap steel addition melting duration is determined as the lower limit value of the scrap steel addition speed.

[0021] In a possible implementation, the first maximum allowed scrap steel addition speed under the maximum temperature rise rate is determined according to the maximum temperature rise rate, comprising:

[0022] obtaining the molten steel quantity in the ladle refining furnace, a heat loss coefficient and a specific heat capacity of the molten steel, and calculating a product of the maximum temperature rising rate, the molten steel quantity in the ladle refining furnace, the heat loss coefficient and the specific heat capacity of the molten steel, determining the product as a maximum effective heat efficiency of the ladle refining furnace;

[0023] obtaining a total heat consumption of scrap melting, and determining a ratio of the maximum effective heat efficiency to the total heat consumption of scrap melting as the first maximum allowable scrap charging speed.

[0024] In a possible implementation, the determining the second maximum allowable scrap charging speed at the scrap melting rate comprises:

[0025] determining a product of the scrap melting rate and the molten steel quantity in the ladle refining furnace as the second maximum allowable scrap charging speed.

[0026] In a possible implementation, the determining the predicted scrap charging quantity of the ladle refining furnace according to the maximum allowable temperature drop of the ladle refining furnace and the effective temperature rising power of the ladle refining furnace comprises:

[0027] obtaining the molten steel quantity in the ladle refining furnace, and determining a first maximum scrap charging quantity in the maximum allowable temperature drop according to the maximum allowable temperature drop and the molten steel quantity;

[0028] determining a second maximum scrap charging quantity at the effective temperature rising power of the ladle refining furnace according to the effective temperature rising power of the ladle refining furnace;

[0029] determining a minimum value of the first maximum scrap charging quantity and the second maximum scrap charging quantity as the predicted scrap charging quantity.

[0030] In a possible implementation, the determining the first maximum scrap charging quantity in the maximum allowable temperature drop according to the maximum allowable temperature drop and the molten steel quantity comprises:

[0031] obtaining a heat loss coefficient, a specific heat capacity of the molten steel and a total heat consumption of scrap melting, and calculating a product of the maximum allowable temperature drop, the molten steel quantity and the specific heat capacity of the molten steel, and determining the product as a maximum molten steel exothermic quantity;

[0032] calculating a product of the heat loss coefficient and the total heat consumption of scrap melting, and determining the product as an actual heat absorption quantity per unit of scrap;

[0033] determining the first maximum scrap charging quantity according to a ratio of the maximum molten steel exothermic quantity to the actual heat absorption quantity per unit of scrap.

[0034] In a possible implementation, the second maximum scrap steel adding amount under the effective heating power of the ladle refining furnace is determined according to the effective heating power of the ladle refining furnace, and includes:

[0035] The total heat generation energy of the ladle refining furnace in the maximum allowed steelmaking time is determined according to the product of the effective heating power and the maximum allowed steelmaking time.

[0036] The target temperature required for refining of the ladle refining furnace and the current temperature of the ladle refining furnace are obtained, and a temperature difference between the target temperature and the current temperature is calculated.

[0037] The heat required for heating of the ladle refining furnace is determined according to 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.

[0038] The second maximum scrap steel adding amount is determined according to the difference between the total heat generation energy and the heat required for heating of the ladle refining furnace, and the total heat consumption for melting of scrap steel.

[0039] In a second aspect, an embodiment of the present application provides a production rhythm control device for electric furnace steelmaking, comprising:

[0040] An obtaining module is configured to obtain the casting speed of a continuous casting machine, the melting rate of scrap steel, the maximum allowed temperature drop of a ladle refining furnace, the effective heating power, and the maximum temperature rise rate, respectively.

[0041] A calculation module is configured to:

[0042] The expected scrap steel adding amount of the ladle refining furnace is determined according to the maximum allowed temperature drop and the effective heating power of the ladle refining furnace.

[0043] The upper and lower limit values of the scrap steel adding speed are determined according to the expected scrap steel adding amount, the casting speed, the maximum temperature rise rate, and the melting rate of scrap steel.

[0044] A control module is configured to add a first preset scrap steel amount into the ladle refining furnace at a first speed and add a second preset scrap steel amount into the ladle refining furnace at a second speed within the range of the upper and lower limit values, wherein the sum of the first preset scrap steel amount and the second preset scrap steel amount is the expected scrap steel adding amount, and the first preset scrap steel amount is greater than the second preset scrap steel amount; and the first speed is greater than the second speed.

[0045] During the process of adding scrap steel, the casting speed of the continuous casting machine is monitored in real time, and when the change amplitude of the casting 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 casting speed.

[0046] In a third aspect, an electronic device is provided, which includes a memory and a processor. The memory stores a computer program. The processor implements the method in the first aspect or any possible implementation of the first aspect when executing the computer program.

[0047] In a fourth aspect, a computer readable storage medium is provided, which stores a computer program. The computer program, when executed by a processor, implements the method in the first aspect or any possible implementation of the first aspect.

[0048] In a fifth aspect, a computer program product is provided, which includes a computer program. The computer program, when executed by a processor, implements the method in the first aspect or any possible implementation of the first aspect.

[0049] The embodiments of the present application can significantly shorten the initial smelting time of the electric furnace, improve the production rhythm of the electric furnace in the early stage, and effectively alleviate the problem of mismatching of the production rhythm. Meanwhile, considering that adding a large amount of scrap steel directly into the LF furnace may cause a sudden temperature drop in the LF furnace, the scrap steel cannot be melted, and other problems, which in turn lead to a decline in the refining quality of the LF furnace, the embodiments of the present application determine the amount of scrap steel according to the maximum allowable temperature drop and the effective heating power of the LF furnace, so as to reasonably control the amount of scrap steel. Moreover, the embodiments of the present application determine the upper and lower limit values of the scrap steel addition speed according to the casting speed, the maximum temperature rise rate and the scrap steel melting rate, so as to ensure that the scrap steel addition speed can match the casting speed of the continuous casting machine, and also avoid problems such as a sudden temperature drop and the scrap steel cannot be melted in time due to the addition speed. In addition, the embodiments of the present application also adopt a strategy of adding scrap steel in stages, that is, a large part of the scrap steel is added at a faster speed in the early stage of scrap steel addition, so as to fully utilize the high-temperature molten steel in the LF furnace to accelerate the melting of the scrap steel and improve the overall efficiency; and the remaining part of the scrap steel is added at a smaller speed in the later stage of scrap steel addition, so as to avoid excessive temperature drop and affect the refining quality.

[0050] Moreover, the embodiments of the present application also consider that the casting speed of the continuous casting machine may fluctuate, which in turn affects the production rhythm. Therefore, when the change range of the casting speed exceeds a set threshold, the embodiments of the present application dynamically adjust the scrap steel addition speed and the amount of scrap steel in each stage, so as to ensure the stability of the production rhythm. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 is an implementation flowchart of the production rhythm control method for electric furnace steelmaking provided by the embodiments of the present application;

[0052] Figure 2 is an implementation flowchart of the method for determining the upper and lower limit values of the scrap steel addition speed provided by the embodiments of the present application;

[0053] Figure 3 is a structural schematic diagram of a production rhythm control device for electric furnace steelmaking provided by an embodiment of the present application;

[0054] Figure 4 is a schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0055] Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0056] In the electric furnace steelmaking process, the production rhythm of the early electric furnace initial smelting and the LF furnace refining process is relatively slow. The production rhythm of the later continuous casting machine casting process is fast, which leads to problems in the connection between the processes. The LF furnace is difficult to continuously and stably supply qualified molten steel at the required high speed required by the continuous casting machine, which restricts the improvement of the overall production efficiency.

[0057] To match the production rhythm before and after the electric furnace steelmaking process, an embodiment of the present application considers adding scrap steel directly in the LF furnace, thereby significantly shortening the electric furnace initial smelting time, improving the production rhythm of the early electric furnace steelmaking, and effectively alleviating the problem of mismatched production rhythm. At the same time, considering that directly adding a large amount of scrap steel in the LF furnace may cause a sudden temperature drop in the LF furnace, the scrap steel cannot be melted in time, and other problems, which in turn lead to a decrease in the LF furnace refining quality, therefore, an embodiment of the present application also determines the upper and lower limit values of the predicted scrap steel addition amount and scrap steel addition speed according to the maximum allowable temperature drop of the LF furnace, the casting speed of the continuous casting machine, the maximum temperature rise rate, the scrap steel melting rate and other parameters, so as to match the production rhythm before and after the process while ensuring the quality of the molten steel.

[0058] In addition, to further balance the quality of the molten steel and the early production efficiency, an embodiment of the present application also adopts a phased addition strategy, adding most of the scrap steel at a faster speed before the scrap steel is added, so as to fully utilize the high-temperature molten steel in the LF furnace to accelerate the melting of the scrap steel and improve the overall efficiency; adding the remaining part of the scrap steel at a smaller speed after the scrap steel is added, so as to avoid excessive temperature drop and affect the refining quality.

[0059] Referring to Figure 1 which shows an implementation flowchart of a production rhythm control method for electric furnace steelmaking provided by an embodiment of the present application, and is described in detail as follows:

[0060] Step 101, respectively acquiring the casting speed of the continuous casting machine, the scrap steel melting rate, the maximum allowable temperature drop of the ladle refining furnace, the effective heating power and the maximum temperature rise rate.

[0061] Here, the casting speed of the continuous casting machine can reflect the production rhythm of the continuous casting machine. The scrap melting rate can reflect the melting capacity of the LF furnace for scrap. The maximum allowable temperature drop of the LF furnace can reflect the bearing capacity of the LF furnace for the temperature drop caused by the scrap. The effective heating power and the maximum temperature rise rate of the LF furnace can reflect the heating capacity of the LF furnace.

[0062] According to the above parameters, the embodiment of the present application mainly determines the expected scrap adding amount and the scrap adding speed from three aspects of production rhythm, whether the scrap can be timely melted, and whether the scrap will cause the temperature drop of the LF furnace to sharply decrease.

[0063] In step 102, the expected scrap adding amount of the ladle refining furnace is determined according to the maximum allowable temperature drop and the effective heating power of the ladle refining furnace.

[0064] Here, according to the maximum allowable temperature drop, the maximum scrap adding amount that can be borne by the LF furnace under the constraint of the maximum allowable temperature drop can be determined. According to the effective heating power, the maximum scrap adding amount that can be borne by the LF furnace under the constraint of the heating capacity of the LF furnace can be determined. The minimum value of the maximum scrap adding amounts under the two constraints is the expected scrap adding amount.

[0065] In step 103, the upper and lower limit values of the scrap adding speed are determined according to the expected scrap adding amount, the casting speed, the maximum temperature rise rate and the scrap melting rate.

[0066] The casting speed can reflect the production rhythm of the continuous casting machine. According to the expected scrap adding amount and the casting speed, the embodiment of the present application can determine the scrap adding speed that conforms to the production rhythm of the continuous casting machine. The speed is the lower limit value of the scrap adding speed.

[0067] Under the constraint of the maximum temperature rise rate of the LF furnace, the embodiment of the present application can determine the maximum scrap adding speed that can avoid the problem of temperature sharply decreasing. Similarly, under the constraint of the scrap melting rate, the maximum scrap adding speed that can avoid the problem of the scrap not being timely melted can also be determined. The minimum value of the maximum scrap adding speeds under the two constraints is the upper limit value of the scrap adding speed.

[0068] In step 104, a first preset scrap amount is added into the ladle refining furnace at a first speed, and a second preset scrap amount is added into the ladle refining furnace at a second speed within the range of the upper and lower limit values. The sum of the first preset scrap amount and the second preset scrap amount is the expected scrap adding amount, and the first preset scrap amount is greater than the second preset scrap amount. The first speed is greater than the second speed.

[0069] The steelmaking work of the LF furnace mainly includes two stages of scrap steel adding and melting and molten steel refining. After the scrap steel adding and melting of the LF furnace is completed, the molten steel refining is performed. In the early stage of scrap steel adding, the molten steel in the LF furnace has a high temperature, and the scrap steel adding speed can be appropriately increased to accelerate the melting of the scrap steel by using the high-temperature molten steel in the LF furnace. Exemplarily, the first preset scrap steel amount can account for a large part (for example, 60% to 80%) of the predicted scrap steel adding amount. In the middle and late stages of scrap steel adding, the scrap steel adding speed can be reduced to avoid excessive temperature drop in the late stage of scrap steel adding, thereby affecting the quality of subsequent molten steel refining.

[0070] In the process of adding scrap steel, the temperature drop of the LF furnace and the melting of the scrap steel can be monitored in real time, and the scrap steel adding speed can be adjusted in real time based on the temperature drop and the melting of the scrap steel.

[0071] Here, the arc heating function of the LF furnace can be started at the same time as the scrap steel is added, so as to avoid a sharp temperature drop after the scrap steel is added, and even the temperature of the LF furnace can be increased. In addition, electromagnetic stirring or bottom argon blowing stirring can be performed during the process of adding the scrap steel, so as to accelerate the heat exchange between the scrap steel and the molten steel and increase the melting speed.

[0072] The scrap steel directly added in the LF furnace in the embodiment of the application can be clean scrap steel with a small size, so as to shorten the steelmaking time of the LF furnace as much as possible. In addition, the scrap steel can be dried in advance to avoid explosion danger.

[0073] Here, the clean scrap steel can be block-shaped scrap steel with a harmful element (for example, P, S, Pb, etc.) content ≤0.05%, no rust and no oil stains. The size of the scrap steel is less than or equal to 100 mm.

[0074] The scrap steel can be sorted in advance in the application to remove scrap steel containing explosion risk such as closed cavity and flammable and explosive materials. On this basis, block-shaped scrap steel with a size less than or equal to 100 mm, a harmful element (for example, P, S, Pb, etc.) content ≤0.05%, no rust and no oil stains is further screened.

[0075] In step 105, the casting speed of the continuous casting machine is monitored in real time during the process of adding the scrap steel, and when the change amplitude of the casting 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 casting speed.

[0076] It should be noted that the casting speed of the continuous casting machine is not absolutely stable, and may fluctuate due to various factors. The change in the casting speed will directly affect the production rhythm, and in turn affect the scrap steel adding strategy determined in step 104. Therefore, in the process of performing the scrap steel adding operation according to the scrap steel adding strategy determined in step 104, the embodiment of the present application monitors the casting speed of the continuous casting machine in real time, and adjusts the scrap steel adding strategy when the change range of the casting speed exceeds a set threshold. Here, adjusting the scrap steel adding strategy mainly refers to adjusting the first speed, the second speed, the first preset scrap steel amount and the second preset scrap steel amount.

[0077] The change range of the casting speed can be expressed as: . Wherein, represents the change range of the casting speed, represents the casting speed monitored in real time during the scrap steel adding process, represents the casting speed when the scrap steel adding strategy is formulated or adjusted. Wherein, when the first strategy adjustment is performed, represents the casting speed when the scrap steel adding strategy is formulated (i.e. the initial casting speed obtained in step 101), and when the Nth strategy adjustment is performed, represents the casting speed when the scrap steel strategy is adjusted last time. N is an integer greater than or equal to 2.

[0078] Here, the set threshold can be set according to the actual situation. For example, the set threshold can be 10%.

[0079] It should be noted that for the adjusted first speed, second speed, first preset scrap steel amount and second preset scrap steel amount, the requirements that the first speed is greater than the second speed and the proportion of the first preset scrap steel amount is greater than the proportion of the second preset scrap steel amount are met, so as to ensure that the overall efficiency is improved while avoiding affecting the refining quality.

[0080] Wherein, the proportion of the first preset scrap steel amount refers to the proportion of the first preset scrap steel amount in the predicted scrap steel adding amount. Similarly, the proportion of the second preset scrap steel amount refers to the proportion of the second preset scrap steel amount in the predicted scrap steel adding amount.

[0081] It can be understood that the embodiment of the present application adjusts the strategy when the change range of the casting speed exceeds the set threshold, which can prevent the strategy from being adjusted too frequently, thereby ensuring stability.

[0082] The embodiment of the present application can significantly shorten the initial refining time of the electric furnace, improve the production rhythm in the early stage of the electric furnace steelmaking, and effectively alleviate the problem of mismatching of production rhythm. At the same time, considering that adding a large amount of scrap steel directly in the LF furnace may cause a sudden temperature drop in the LF furnace, the scrap steel cannot be melted, and other problems, thereby leading to a decrease in the refining quality of the LF furnace, therefore, the embodiment of the present application determines the scrap steel adding amount according to the maximum allowable temperature drop and the effective heating power of the LF furnace, so as to reasonably control the scrap steel adding amount. Moreover, the embodiment of the present application also determines the upper and lower limit values of the scrap steel adding speed according to the casting speed, the maximum temperature rise rate and the scrap steel melting rate, so as to ensure that the scrap steel adding speed can match the casting speed of the continuous casting machine, and also avoid problems such as temperature drop and scrap steel cannot be melted in time caused by the adding speed. In addition, the embodiment of the present application also adopts a strategy of adding in stages, and a large part of the scrap steel is added at a faster speed in the early stage of scrap steel adding, so as to fully utilize the high-temperature molten steel in the LF furnace to accelerate the melting of the scrap steel and improve the overall efficiency; the remaining part of the scrap steel is added at a smaller speed in the later stage of scrap steel adding, so as to avoid excessive temperature drop and affect the refining quality.

[0083] Moreover, the embodiment of the present application also considers that the casting speed of the continuous casting machine may fluctuate, thereby affecting the production rhythm, therefore, when the change range of the casting speed exceeds a set threshold, the embodiment of the present application dynamically adjusts the scrap steel adding speed and the scrap steel adding amount in each stage, so as to ensure the stability of the production rhythm.

[0084] The specific determination method of the predicted scrap steel adding amount will be introduced below.

[0085] In some embodiments, when determining the predicted scrap steel adding amount, the molten steel amount in the ladle refining furnace can be obtained first, and the first maximum scrap steel adding amount within the maximum allowable temperature drop can be determined according to the maximum allowable temperature drop and the molten steel amount; then, the second maximum scrap steel adding amount under the effective heating power of the ladle refining furnace can be determined according to the effective heating power of the ladle refining furnace; finally, the minimum value of the first maximum scrap steel adding amount and the second maximum scrap steel adding amount is determined as the predicted scrap steel adding amount.

[0086] In some embodiments, when determining the first maximum scrap steel adding amount, the heat loss coefficient, the specific heat capacity of molten steel and the total heat consumption of scrap steel melting can be obtained, the product of the maximum allowable temperature drop, the molten steel amount and the specific heat capacity of molten steel is calculated, and the product is determined as the maximum heat release amount 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 amount of unit scrap steel; finally, the first maximum scrap steel adding amount is determined according to the ratio of the maximum heat release amount of molten steel to the actual heat absorption amount of unit scrap steel.

[0087] The first maximum scrap steel adding amount can be expressed by a mathematical expression as follows: ;

[0088] wherein, represents the first maximum scrap addition amount, represents the maximum allowable temperature drop, usually 30-60℃, represents the molten steel amount in the LF furnace, represents the specific heat capacity of molten steel, represents the heat loss coefficient, represents the total heat consumption for scrap melting, which is about 1260 kJ / kg in the normal temperature state.

[0089] Here, the total heat consumption for scrap melting includes: the solid-state enthalpy of scrap heating from normal temperature to melting point, the latent heat of melting, and the liquid-state enthalpy of heating from melting point to target temperature. Among them, the target temperature refers to the target molten steel temperature of the LF refining.

[0090] Here, the heat loss coefficient is the ratio of the actual temperature drop to the theoretical temperature drop, which is an empirical parameter. Its specific value depends on the equipment state (such as the thickness of the furnace lining, the sealing performance) and the operating conditions (such as the stirring intensity). The person skilled in the art can calibrate it according to the field data: compare the actual temperature drop before and after the scrap addition with the theoretical temperature drop, and inversely calculate the value.

[0091] Among them, the calculation formula of the theoretical temperature drop can be expressed as: . Among them, represents the theoretical temperature drop, represents the scrap addition amount.

[0092] Exemplarily, in the normal working condition, the value range of the heat loss coefficient can be 1.1-1.3.

[0093] Here, the product of the maximum allowable temperature drop , the molten steel amount and the specific heat capacity of molten steel can reflect the maximum exothermic amount of molten steel in the LF furnace. The product of the heat loss coefficient and the total heat consumption for scrap melting can reflect the actual heat absorption amount per unit of scrap. Based on the principle of heat absorption and exothermic balance, the ratio of the maximum exothermic amount of molten steel to the actual heat absorption amount per unit of scrap is determined as the first maximum scrap addition amount.

[0094] In some embodiments, in determining the second maximum scrap steel addition amount, the total heat generation energy of the ladle refining furnace within the maximum allowed steelmaking time can be determined according to the product of the effective heating power and the maximum allowed steelmaking time; then, the target temperature required for refining of 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 for heating of the ladle refining furnace is determined according to 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; and finally, the second maximum scrap steel addition amount is determined according to the difference between the total heat generation energy and the heat required for heating of the ladle refining furnace, and the total heat consumption for melting of scrap steel.

[0095] The mathematical expression of the second maximum scrap steel addition amount can be expressed as:

[0096]

[0097] wherein, represents the second maximum scrap steel addition amount, P represents the effective heating power, represents the maximum allowed steelmaking time, represents the target temperature, represents the current temperature.

[0098] Here, the product of the effective heating power and the maximum allowed steelmaking time is the total heat generation energy of the LF furnace within the maximum allowed steelmaking time. 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 is the heat required for heating of the ladle refining furnace from the current temperature to the target temperature required for refining. The total heat consumption for melting of scrap steel is used to represent the heat absorption requirement of unit scrap steel. The ratio of the difference between the total heat generation energy and the heat required for heating of the LF furnace to the total heat consumption for melting of scrap steel is the second maximum scrap steel addition amount.

[0099] Here, the maximum allowed steelmaking time can be determined according to the casting speed of the continuous casting machine. Specifically, two LF furnaces are provided for alternating operation in the electric furnace steelmaking process, one of which receives the molten steel output by the electric furnace and directly added scrap steel, and performs refining of the molten steel. The other LF furnace completes the refining of the molten steel and casts the molten steel to the continuous casting machine. In determining the maximum allowed steelmaking time, the molten steel consumption of the continuous casting machine within a unit time can be first determined according to the casting speed; then, the ratio of the amount of molten steel in the other LF furnace (i.e., the LF furnace that completes the refining of the molten steel and delivers the molten steel to the continuous casting machine) to the molten steel consumption is used to determine the maximum allowed steelmaking time of the current LF furnace.

[0100] The molten steel consumption of the continuous casting machine within a unit time can be expressed as: ;

[0101] wherein, represents the molten steel consumption of the continuous casting machine within a unit time, represents the casting speed, represents a casting blank cross-sectional area, represents a molten steel density, N represents a continuous casting machine flow number.

[0102] After determining the predicted scrap steel addition amount, referring to Figure 2 , the embodiment of the present application further determines the upper and lower limit values of the scrap steel addition speed. Specifically as follows:

[0103] Step 201, based on the casting blank speed, determine the maximum allowed steelmaking time of the ladle refining furnace, and based on the maximum allowed steelmaking time and the predicted scrap steel addition amount, determine the lower limit value of the scrap steel addition speed;

[0104] Here, the determination method of the maximum allowed steelmaking time is described above, and will not be repeated here. Based on the determination of the maximum allowed steelmaking time, the embodiment of the present application further determines the lower limit value of the scrap steel addition speed. Specifically, the time proportion corresponding to the scrap steel addition melting stage is obtained, and the product of the time proportion and the maximum allowed steelmaking time is determined as the scrap steel addition melting time; Then, the ratio of the predicted scrap steel addition amount and the scrap steel addition melting time is determined as the lower limit value of the scrap steel addition speed.

[0105] The steelmaking work in the LF furnace is mainly divided into a scrap steel addition melting stage and a molten steel refining stage. Among them, in order to ensure the refining quality, the time proportion of the scrap steel addition melting stage can be reduced, and sufficient time is reserved for the molten steel refining stage. Exemplarily, the time proportion of the scrap steel addition melting stage can be less than or equal to 0.3, so as to fully guarantee the refining quality.

[0106] The embodiment of the present application determines the product of the time proportion and the maximum allowed steelmaking time as the scrap steel addition melting time, and then calculates the ratio of the predicted scrap steel addition amount and the scrap steel addition melting time, and determines it as the lower limit value of the scrap steel addition speed, so that the LF furnace can match the production rhythm of the continuous casting machine.

[0107] Step 202, according to the maximum temperature rise rate, determine the first maximum allowed scrap steel addition speed under the maximum temperature rise rate;

[0108] In some embodiments, when determining the first maximum allowed scrap steel addition speed, the molten steel amount in the ladle refining furnace, the heat loss coefficient and the specific heat capacity of the molten steel can be obtained, and the product of the maximum temperature rise rate, the molten steel amount in the ladle refining furnace, the heat loss coefficient and the specific heat capacity of the molten steel is calculated. The product is determined as the maximum effective thermal efficiency of the ladle refining furnace; Then, the total heat consumption of the scrap steel melting is obtained, and the ratio of the maximum effective thermal efficiency and the total heat consumption of the scrap steel melting is determined as the first maximum allowed scrap steel addition speed.

[0109] The mathematical expression of the first maximum allowed scrap steel addition speed can be expressed as:

[0110]

[0111] wherein, represents the first maximum allowable scrap steel adding speed, represents the maximum temperature rising rate.

[0112] In step 203, the second maximum allowable scrap steel adding speed under the scrap steel melting rate is determined according to the scrap steel melting rate.

[0113] The scrap steel melting rate can be understood as the upper limit of the scrap steel that can be melted by the molten steel per unit time. On this basis, the product of the scrap steel melting rate and the molten steel quantity is directly determined as the second maximum allowable scrap steel adding speed under the scrap steel melting rate constraint.

[0114] In step 204, the minimum value between the first maximum allowable scrap steel adding speed and the second maximum allowable scrap steel adding speed is determined as the upper limit value of the scrap steel adding speed.

[0115] The embodiment of the present application determines the first maximum allowable scrap steel adding speed based on the temperature rising rate constraint, and determines the second maximum allowable scrap steel adding speed based on the scrap steel melting rate constraint. By comprehensively considering the maximum temperature rising rate constraint and the scrap steel melting rate constraint, the minimum value between the two is determined as the upper limit value of the scrap steel adding speed.

[0116] On the basis of determining the upper and lower limit values of the predicted scrap steel adding quantity and the scrap steel adding speed, and further determining the initial scrap steel adding strategy, the embodiment of the present application further introduces the adjustment method of the scrap steel adding strategy when the casting speed changes during the scrap steel adding process.

[0117] As can be known from the above, the change of the casting speed directly affects the maximum allowable steelmaking time, and further affects the lower limit value of the predicted scrap steel adding quantity and the scrap steel adding speed.

[0118] Specifically, when the change amplitude of the casting speed exceeds the set threshold value, the maximum allowable steelmaking time of the ladle refining furnace can be re-determined based on the current casting speed, and then the second maximum scrap steel adding quantity is re-determined according to the new maximum allowable steelmaking time, so as to determine whether to update the predicted scrap steel adding quantity. Here, whether the predicted scrap steel adding quantity is updated depends on the size relationship between the first maximum scrap steel adding quantity and the new second maximum scrap steel adding quantity.

[0119] Subsequently, the lower limit value of the new scrap steel adding speed is determined according to the predicted scrap steel adding quantity and the maximum allowable steelmaking time. It is considered that the casting speed does not affect the upper limit value of the scrap steel adding speed. The embodiment of the present application does not update the upper limit value of the scrap steel adding speed.

[0120] On the basis of determining the new predicted scrap steel adding amount and the new lower limit value, the embodiment of the application adjusts the scrap steel adding strategy. Here, the adjustment of the scrap steel adding strategy mainly reflects the adjustment of the first speed, the second speed, the first preset scrap steel amount and the second preset scrap steel amount.

[0121] The specific adjustment method is as follows:

[0122] When the casting speed increases, the continuous casting rhythm accelerates, at this time, the first speed and the second speed are increased. Among them, the increase amplitude of the first speed is greater than that of the second speed (that is, the first speed is significantly increased, and the second speed is appropriately increased). By significantly increasing the first speed and appropriately increasing the second speed, the scrap steel melting time can be compressed in the early stage of scrap steel adding, and the accelerated continuous casting rhythm can be matched. Here, considering that the molten steel temperature in the LF furnace is low in the later stage of scrap steel adding, the increase amplitude of the second speed should not be too large.

[0123] In addition, the embodiment of the application can also increase the proportion of the first preset scrap steel amount to the predicted scrap steel adding amount, and reduce the proportion of the second preset scrap steel amount to the predicted scrap steel adding amount. Thus, the advantage of high temperature in the early stage is maximized, the pressure of scrap steel melting in the later stage is reduced, and the overall scrap steel adding time is shortened to match the accelerated continuous casting rhythm.

[0124] When the casting speed decreases, the continuous casting rhythm slows down, at this time, the first speed and the second speed are decreased. Among them, the decrease amplitude of the first speed is less than that of the second speed. Exemplarily, the decrease amplitude of the first speed can be 0 (that is, the first speed is slightly reduced or maintained, and the second speed is significantly reduced). By slightly reducing or maintaining the first speed and significantly reducing the second speed, the later adding time can be extended in the later stage of scrap steel adding, and the molten steel in the furnace is prevented from reaching the refining target too early to cause waiting and resource waste.

[0125] Moreover, the embodiment of the application can also reduce the proportion of the first preset scrap steel amount to the predicted scrap steel adding amount, and increase the proportion of the second preset scrap steel amount to the predicted scrap steel adding amount, so as to extend the overall scrap steel adding time to match the slowed down continuous casting rhythm.

[0126] It can be understood that the adjusted first speed and the second speed are both greater than the lower limit value of the new scrap steel adding speed, and both are less than the upper limit value of the scrap steel adding speed. The sum of the first preset scrap steel adding amount and the second preset scrap steel adding amount after adjustment is still the predicted scrap steel adding amount.

[0127] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiment of the application.

[0128] The following is an embodiment of the device of the present application, for details not described in detail, can refer to the corresponding method embodiments described above.

[0129] Figure 3 The structure of the electric furnace steelmaking production rhythm control device provided by the embodiment of the present application is shown, only the part related to the embodiment of the present application is shown for the convenience of description, and the details are described as follows:

[0130] As shown in Figure 3 The electric furnace steelmaking production rhythm control device 3 includes an acquisition module 31, a calculation module 32 and a control module 33.

[0131] The acquisition module 31 is configured to acquire the casting speed of the continuous casting machine, the scrap melting rate, the maximum allowed temperature drop of the ladle refining furnace, the effective temperature rising power and the maximum temperature rising rate, respectively.

[0132] The calculation module 32 is configured to:

[0133] determine the expected scrap steel addition amount of the ladle refining furnace according to the maximum allowed temperature drop of the ladle refining furnace and the effective temperature rising power;

[0134] determine the upper and lower limit values of the scrap steel addition speed according to the expected scrap steel addition amount, the casting speed, the maximum temperature rising rate and the scrap melting rate;

[0135] The control module 33 is configured to add a first preset scrap steel amount into the ladle refining furnace at a first speed and add a second preset scrap steel amount into the ladle refining furnace at a second speed within the range of the upper and lower limit values, wherein the sum of the first preset scrap steel amount and the second preset scrap steel amount is the expected scrap steel addition amount, and the first preset scrap steel amount is greater than the second preset scrap steel amount; the first speed is greater than the second speed.

[0136] During the process of adding scrap steel, the casting speed of the continuous casting machine is monitored in real time, and when the change amplitude of the casting 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 casting speed.

[0137] In a possible implementation, the calculation module 32 is specifically configured to:

[0138] determine the maximum allowed steelmaking time of the ladle refining furnace based on the casting speed, and determine the lower limit value of the scrap steel addition speed based on the maximum allowed steelmaking time and the expected scrap steel addition amount;

[0139] determine the first maximum allowed scrap steel addition speed under the maximum temperature rising rate according to the maximum temperature rising rate;

[0140] determine the second maximum allowed scrap steel addition speed under the scrap melting rate according to the scrap melting rate;

[0141] The minimum of the first maximum allowable scrap charging speed and the second maximum allowable scrap charging speed is determined as an upper limit value of the scrap charging speed.

[0142] In a possible implementation, the calculation module 32 is specifically configured to:

[0143] The product of the time proportion corresponding to the scrap charging melting stage and the maximum allowable steelmaking time is determined as the scrap charging melting duration;

[0144] The ratio of the expected scrap charging amount and the scrap charging melting duration is determined as a lower limit value of the scrap charging speed.

[0145] In a possible implementation, the calculation module 32 is specifically configured to:

[0146] The product of the maximum temperature rise rate, the molten steel amount in the ladle refining furnace, the heat loss coefficient and the specific heat capacity of the molten steel is determined as the maximum effective thermal efficiency of the ladle refining furnace;

[0147] The ratio of the maximum effective thermal efficiency and the total heat consumption of the scrap melting is determined as the first maximum allowable scrap charging speed.

[0148] In a possible implementation, the calculation module 32 is specifically configured to:

[0149] The product of the scrap melting rate and the molten steel amount in the ladle refining furnace is determined as the second maximum allowable scrap charging speed.

[0150] In a possible implementation, the calculation module 32 is specifically configured to:

[0151] The molten steel amount in the ladle refining furnace is obtained, and the first maximum scrap charging amount in the maximum allowable temperature drop is determined according to the maximum allowable temperature drop and the molten steel amount;

[0152] The second maximum scrap charging amount under the effective temperature rise power is determined according to the effective temperature rise power of the ladle refining furnace;

[0153] The minimum of the first maximum scrap charging amount and the second maximum scrap charging amount is determined as the expected scrap charging amount.

[0154] In a possible implementation, the calculation module 32 is specifically configured to:

[0155] The product of the maximum allowable temperature drop, the molten steel amount and the specific heat capacity of the molten steel is determined as the maximum heat release amount of the molten steel;

[0156] The product of the heat loss coefficient and the total heat consumption of the scrap melting is calculated, and the product is determined as the actual heat absorption amount per unit of scrap;

[0157] The first maximum scrap addition amount is determined according to the ratio of the maximum heat release amount of the molten steel to the actual heat absorption amount per unit of scrap.

[0158] In a possible implementation, the calculation module 32 is specifically configured to:

[0159] The total heat production energy of the ladle refining furnace within the maximum allowed steelmaking time is determined according to the product of the effective heating power and the maximum allowed steelmaking time;

[0160] The target temperature required for refining of the ladle refining furnace and the current temperature of the ladle refining furnace are obtained, and a temperature difference between the target temperature and the current temperature is calculated;

[0161] The heat required for heating of the ladle refining furnace is determined according to 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.

[0162] The second maximum scrap addition amount is determined according to the difference between the total heat production energy and the heat required for heating of the ladle refining furnace, and the total heat consumption of the scrap melting.

[0163] The device embodiment can be used to implement the above-mentioned method embodiments, and has the same technical principles and implementation effects as the above-mentioned method embodiments, which will not be described here.

[0164] Figure 4 is a schematic diagram of an electronic device provided by an embodiment of the present application. As shown in the figure, the electronic device 4 of this embodiment includes a processor 40 and a memory 41. The memory 41 stores a computer program 42. The processor 40 implements the steps in each of the above-mentioned method embodiments when executing the computer program 42. Alternatively, the processor 40 implements the functions of each module / unit in each of the above-mentioned device embodiments when executing the computer program 42. Figure 4

[0165] For example, the computer program 42 can be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program 42 in the electronic device 4.

[0166] The electronic device 4 can include, but is not limited to, the processor 40 and the memory 41. Those skilled in the art can understand that, Figure 4 ​The electronic device 4 is merely an example and does not limit the electronic device 4, which can include more or fewer components than shown, or combine some components, or have different components, for example, the electronic device 4 can also include an input / output device, a network access device, a bus, etc.

[0167] The processor 40 can be a central processing unit (CPU), and can also be other general-purpose processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0168] The memory 41 can be an internal storage unit of the electronic device 4, for example, a hard disk or a memory of the electronic device 4. The memory 41 can also be an external storage device of the electronic device 4, for example, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device 4. Further, the memory 41 can include both the internal storage unit and the external storage device 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.

[0169] For the convenience and brevity of description, only the division of the above functional modules / units is exemplified, and in actual application, the above functions can be completed by different functional modules / units according to needs. The above modules / units can be realized in the form of hardware, in the form of software, or in the form of combination of hardware and software.

[0170] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program. When the computer program is executed by a processor, the method in each method embodiment described above is implemented.

[0171] The embodiment of the present application also provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the method in each method embodiment described above is implemented.

[0172] The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms, etc. The computer readable medium can include any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0173] In the above embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in a certain embodiment can be referred to the relevant description of other embodiments. If there is no special description and logical conflict, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0174] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

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, Based on the maximum permissible steelmaking time and the expected amount of scrap steel added, a lower limit for the scrap steel addition rate is determined, including: 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, 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.

5. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 1 or 2, 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.

6. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 5, 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.

7. The method for controlling the production rhythm of electric arc furnace steelmaking according to claim 5, 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.

8. 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.

9. 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 7.

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