LF furnace dynamic argon blowing method, device, equipment and medium

Abstract

The invention relates to the technical field of molten steel refining. The invention discloses an LF furnace dynamic argon blowing method, device and equipment and a medium. The method comprises the steps that the molten steel temperature, the oxygen activity, the average diameter of inclusions and the number of the inclusions are obtained; based on a preset argon flow estimation model, estimating the total argon flow in the current period according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions and the number of the inclusions; and on the basis of a preset argon gas distribution rule, according to the total argon gas flow of the current period, the argon gas flow of each subarea in the current period is obtained, and the argon gas flow of each subarea is adjusted. The total argon flow is calculated according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions and the number of the inclusions in multiple dimensions, the accuracy of the argon flow is improved, then the argon flow of each partition is dynamically adjusted in different periods according to the argon distribution rule, and the stirring uniformity is improved.

Description

Technical Field

[0001] This application relates to the field of steel refining technology, and more specifically, to a dynamic argon blowing method, apparatus, equipment, and medium for an LF furnace. Background Technology

[0002] Argon blowing in an LF furnace is a metallurgical process that involves blowing argon gas into the ladle during the refining process in an LF refining furnace (ladle refining furnace) to achieve a series of metallurgical objectives. Argon blowing agitates the molten steel, promoting uniformity in composition and temperature, facilitating the removal of inclusions, and improving the purity of the steel. Simultaneously, it allows for adjustment of the argon flow rate on the surface of the molten steel, protecting it and preventing secondary oxidation. Traditional LF furnace argon blowing processes rely on temperature or oxygen activity to adjust the argon flow rate, which suffers from inaccurate argon supply and uneven agitation. Therefore, a method for adjusting the argon flow rate that improves agitation uniformity is needed. Summary of the Invention

[0003] In view of the above situation, this application provides a method, apparatus, equipment and medium for dynamic argon blowing in an LF furnace, which aims to solve the above problems or at least partially solve the above problems.

[0004] In a first aspect, this application provides a method for dynamic argon blowing in an LF furnace, comprising:

[0005] Obtain the temperature of molten steel, oxygen activity, average diameter of inclusions, and number of inclusions;

[0006] Based on a pre-set argon flow rate prediction model, the total argon flow rate for the current cycle is predicted according to the molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions.

[0007] Based on the pre-set argon gas allocation rules, the argon gas flow rate of each zone in the current period is obtained according to the total argon gas flow rate of the current period, and the argon gas flow rate of each zone is adjusted.

[0008] For example, based on a pre-set argon flow rate prediction model, the total argon flow rate for the current cycle is predicted according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions, including:

[0009] Based on a preset reference temperature and temperature deviation threshold, the absolute value of the temperature difference between the molten steel temperature and the reference temperature is calculated, and the temperature ratio between the absolute value of the temperature difference and the temperature deviation threshold is calculated.

[0010] Based on a pre-set oxygen activity threshold, calculate the oxygen activity ratio between the oxygen activity and the oxygen activity threshold;

[0011] Based on a pre-set inclusion diameter threshold, the diameter ratio between the average diameter of the inclusion and the inclusion diameter threshold is calculated;

[0012] Based on a pre-set threshold for the number of inclusions, calculate the ratio between the number of inclusions and the threshold for the number of inclusions;

[0013] The argon flow rate adjustment ratio is obtained by summing the temperature ratio, the oxygen activity ratio, the diameter ratio, and the quantity ratio.

[0014] Based on a pre-set argon flow rate baseline, the total argon flow rate for the current cycle is estimated according to the argon flow rate adjustment ratio.

[0015] For example, based on a pre-set argon flow prediction model, the total argon flow rate for the current cycle is predicted according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions. This also includes:

[0016] Based on the molten steel temperature, oxygen activity, average inclusion diameter, and number of inclusions, calculate the changes in molten steel temperature, oxygen activity, average inclusion diameter, and number of inclusions between the current cycle and the previous cycle.

[0017] The temperature weight is obtained based on the ratio of the change in molten steel temperature to the change in the number of inclusions.

[0018] The oxygen activity weight is obtained based on the ratio of the change in oxygen activity to the change in the number of inclusions.

[0019] The diameter weight is obtained by the ratio of the change in the average diameter of the inclusions to the change in the number of inclusions.

[0020] The quantity weight is obtained based on the change in the number of inclusions;

[0021] The argon flow rate adjustment ratio is adjusted according to the temperature weight, the oxygen activity weight, the diameter weight, and the quantity weight.

[0022] Based on the preset argon flow rate baseline value, the total argon flow rate for the current cycle is estimated according to the adjusted argon flow rate adjustment ratio.

[0023] For example, after estimating the total argon flow rate for the current cycle, the method includes:

[0024] To obtain the density and number of inclusions in molten steel;

[0025] The argon stirring energy is obtained based on the molten steel density, the number of inclusions, and the total argon flow rate in the current cycle.

[0026] Based on a pre-set energy threshold, when the argon stirring energy is greater than the energy threshold, the argon flow rate of each zone in the current cycle is obtained based on the pre-set argon distribution rules and the total argon flow rate in the current cycle.

[0027] For example, based on a pre-set argon gas allocation rule, the argon gas flow rate of each zone in the current period is obtained according to the total argon gas flow rate of the current period, and the argon gas flow rate of each zone is adjusted, including:

[0028] Based on the pre-set mapping relationship between the total argon flow rate and the argon flow rate of each zone, the argon flow rate of each zone in the current period is obtained according to the total argon flow rate of the current period, and the argon flow rate of each zone is adjusted.

[0029] For example, after obtaining the argon flow rate of each partition in the current cycle, the method further includes:

[0030] To obtain the density of molten steel, the density of inclusions, and the viscosity of molten steel;

[0031] The average buoyancy rate of the inclusions is calculated based on the density of the molten steel, the density of the inclusions, the viscosity of the molten steel, the temperature of the molten steel, the oxygen activity, and the average diameter of the inclusions.

[0032] Based on the pre-set mapping relationship between argon blowing time and the average rising rate of inclusions, the argon blowing time is obtained according to the average rising rate of inclusions.

[0033] For example, after obtaining the molten steel temperature, oxygen activity, average inclusion diameter, and number of inclusions, the method includes:

[0034] Obtain the type of molten steel and determine whether the molten steel is Class I steel or Class II steel;

[0035] When the molten steel is a type 1 steel, the total argon flow rate for the current cycle is estimated based on a pre-set first argon flow rate prediction model, according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions.

[0036] When the molten steel is a type II steel, the total argon flow rate for the current cycle is estimated based on a pre-set second argon flow rate prediction model, according to the molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions.

[0037] Secondly, this application also provides a dynamic argon blowing device for an LF furnace, comprising:

[0038] The acquisition module is used to acquire steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions.

[0039] The estimation module is used to estimate the total argon flow rate in the current cycle based on a pre-set argon flow rate estimation model, according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions.

[0040] The allocation module is used to obtain the argon flow rate of each partition in the current period based on the pre-set argon allocation rules and the total argon flow rate in the current period, and to adjust the argon flow rate of each partition.

[0041] Thirdly, this application also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the LF furnace dynamic argon blowing method as described in the first aspect.

[0042] Fourthly, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the LF furnace dynamic argon blowing method as described in the first aspect.

[0043] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0044] This application calculates the total argon flow rate from multiple dimensions, including molten steel temperature, oxygen activity, average inclusion diameter, and inclusion quantity, thereby improving the accuracy of argon flow rate. Furthermore, it dynamically adjusts the argon flow rate of each zone within different cycles using argon distribution rules, thereby improving the uniformity of stirring. Attached Figure Description

[0045] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0046] Figure 1 This is a schematic diagram of an application environment for the dynamic argon blowing method in an LF furnace according to an embodiment of the present invention;

[0047] Figure 2 This is a schematic flowchart of a dynamic argon blowing method for an LF furnace according to an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of step S20 of the dynamic argon blowing method for an LF furnace in one embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of a specific process of the dynamic argon blowing method for an LF furnace in one embodiment of the present invention;

[0050] Figure 5This is a schematic diagram of the structure of the dynamic argon blowing device for the LF furnace in one embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the structure of a computer device according to an embodiment of the present invention;

[0052] Figure 7 This is another structural schematic diagram of a computer device according to one embodiment of the present invention. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the term "comprising" and its variations should be interpreted as open-ended terms meaning "including but not limited to."

[0055] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0056] As mentioned earlier, current LF furnace argon blowing processes rely on temperature or oxygen activity to adjust argon flow, resulting in inaccurate argon supply and uneven mixing. To address this technical problem, this application provides a dynamic argon blowing method for LF furnaces.

[0057] The dynamic argon blowing method for LF furnaces provided in this invention can be applied to applications such as... Figure 1In this application environment, the device communicates with the server via a network. The server can obtain steel temperature, oxygen activity, average inclusion diameter, and inclusion quantity from the device. Based on a pre-set argon flow prediction model, it estimates the total argon flow rate for the current cycle according to the steel temperature, oxygen activity, average inclusion diameter, and inclusion quantity. Based on a pre-set argon distribution rule, it obtains the argon flow rate of each zone for the current cycle based on the total argon flow rate for the current cycle. This application improves the accuracy of argon flow rate by calculating the total argon flow rate from multiple dimensions, including steel temperature, oxygen activity, average inclusion diameter, and inclusion quantity. Furthermore, by dynamically adjusting the argon flow rate of each zone in different cycles through the argon distribution rule, it improves the uniformity of stirring.

[0058] The device side can be, but is not limited to, various sensor devices. The server side can be implemented using a standalone server or a server cluster consisting of multiple servers. The invention will now be described in detail through specific embodiments.

[0059] Please see Figure 2 As shown, Figure 2 A schematic flowchart of the dynamic argon blowing method for an LF furnace provided in an embodiment of the present invention includes the following steps:

[0060] S10: Obtain the temperature of molten steel, oxygen activity, average diameter of inclusions, and number of inclusions.

[0061] Specifically, ultrasonic sensors are installed on the side wall of the LF furnace (Ladle Furnace). The ultrasonic sensors are encapsulated in high-temperature resistant ceramic, with an operating temperature ≤1700℃, a vertical insertion depth of 300mm into molten steel, and a detection range covering 80% of the furnace area.

[0062] An oxygen activity sensor and an infrared thermometer are integrated into the top of the LF furnace. The oxygen activity sensor uses a ZrO2-based solid electrolyte. An ultrasonic sensor is used to collect data on the average diameter and number of inclusions, the oxygen activity sensor is used to collect oxygen activity, and the infrared thermometer is used to collect the temperature of the molten steel. The sampling frequency of the ultrasonic sensor, oxygen activity sensor, and infrared thermometer is 1 time / second. The collected data is transmitted to the central control system via optical fiber to avoid electromagnetic interference.

[0063] S20: Based on a pre-set argon flow prediction model, estimate the total argon flow rate for the current cycle according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions.

[0064] Specifically, this application calculates the total argon flow rate from multiple dimensions, including molten steel temperature, oxygen activity, average inclusion diameter, and number of inclusions, thereby improving the accuracy of argon flow rate.

[0065] In one embodiment, reference Figure 3 As shown, step S20, based on a pre-set argon flow rate prediction model, estimates the total argon flow rate for the current cycle according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions, including:

[0066] S21: Based on a preset reference temperature and temperature deviation threshold, calculate the absolute value of the temperature difference between the molten steel temperature and the reference temperature, and calculate the temperature ratio between the absolute value of the temperature difference and the temperature deviation threshold.

[0067] Based on a pre-set oxygen activity threshold, calculate the oxygen activity ratio between the oxygen activity and the oxygen activity threshold;

[0068] Based on a pre-set inclusion diameter threshold, the diameter ratio between the average diameter of the inclusion and the inclusion diameter threshold is calculated;

[0069] Based on a pre-set threshold for the number of inclusions, calculate the ratio between the number of inclusions and the threshold for the number of inclusions;

[0070] S22: Sum the temperature ratio, the oxygen activity ratio, the diameter ratio, and the quantity ratio to obtain the argon flow rate adjustment ratio;

[0071] S23: Based on the preset argon flow rate benchmark value, estimate the total argon flow rate for the current cycle according to the argon flow rate adjustment ratio.

[0072] In one specific embodiment, the preset reference temperature is T. ref Temperature deviation threshold is T range Temperature deviation threshold T range This is the maximum value of the difference between the obtained molten steel temperature T and a preset reference temperature. For example, the preset reference temperature is T. ref The temperature is 1575℃, and the temperature deviation threshold is T. range The temperature is 50℃. The temperature ratio between the absolute value of the temperature difference and the temperature deviation threshold can be expressed as:

[0073] In one specific embodiment, the preset oxygen activity threshold is the oxygen activity critical value C. o,crit The unit is ppm, and the oxygen activity C is... o The oxygen activity ratio between the stated oxygen activity threshold and the oxygen activity ratio can be expressed as:

[0074] In one specific embodiment, the pre-set inclusion diameter threshold is the maximum allowable inclusion diameter d. p,maxThe unit is μm; for example, a preset inclusion diameter threshold could be 50 μm. The average diameter d of the inclusion is... p The diameter ratio between the inclusion diameter threshold and the diameter of the inclusion can be expressed as:

[0075] In one specific embodiment, the pre-set threshold for the number of inclusions is N. crit Used to assess whether the number of inclusions per unit volume exceeds the standard, with the unit being inclusions / cm³. 3 For example, the preset threshold for the number of inclusions can be 5 per cm. 3 Calculate the number N of the inclusions. inclusion With respect to the threshold number N of the inclusions crit The ratio between the quantities can be expressed as:

[0076] In one specific embodiment, the temperature ratio described above... The oxygen activity ratio The diameter ratio and the ratio of the quantity The summation yields the argon flow rate adjustment ratio. Further, based on a pre-set argon flow rate baseline value, the total argon flow rate for the current cycle is estimated according to the argon flow rate adjustment ratio. This setting allows for dynamic adjustment of the total argon flow rate based on the molten steel temperature, oxygen activity, average inclusion diameter, and number of inclusions.

[0077] In one specific embodiment, adjustment weights were set for temperature, oxygen activity, average diameter of inclusions, and number of inclusions, and the weights were further adaptively adjusted to achieve dynamic adjustment of the total argon flow rate and improve accuracy.

[0078] In one specific embodiment, reference Figure 3 As shown, step S20, based on a pre-set argon flow rate prediction model, estimates the total argon flow rate for the current cycle according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions. It also includes:

[0079] S211: Based on the molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions, calculate the changes in molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions between the current cycle and the previous cycle.

[0080] S212: The temperature weight is obtained based on the ratio of the change in molten steel temperature to the change in the number of inclusions;

[0081] The oxygen activity weight is obtained based on the ratio of the change in oxygen activity to the change in the number of inclusions.

[0082] The diameter weight is obtained by the ratio of the change in the average diameter of the inclusions to the change in the number of inclusions.

[0083] The quantity weight is obtained based on the change in the number of inclusions;

[0084] S22′: Adjust the argon flow rate adjustment ratio according to the temperature weight, the oxygen activity weight, the diameter weight, and the quantity weight;

[0085] S23′: Based on the preset argon flow rate baseline value, estimate the total argon flow rate for the current cycle according to the adjusted argon flow rate adjustment ratio.

[0086] In one specific embodiment, the temperature weight, the oxygen activity weight, the diameter weight, and the quantity weight have initial values, which are preset based on theoretical simulation: temperature weight α = 0.4, oxygen activity weight β = 0.3, diameter weight γ = 0.2, and quantity weight δ = 0.1.

[0087] In one specific embodiment, the duration of one cycle is 5 minutes. Since the sampling frequency is 1 time / second, the steel temperature, oxygen activity, average inclusion diameter, and number of inclusions corresponding to one cycle are all average values ​​within the cycle. The steel temperature change value between the current cycle and the previous cycle is ΔT, and the oxygen activity change value is ΔC. O , the change in the average diameter of inclusions △d p Change in the amount of inclusions, ΔN.

[0088] In one specific embodiment, the temperature weight is obtained based on the ratio ΔT of the change in molten steel temperature to ΔN of the change in the number of inclusions. Based on the oxygen activity change value ΔC O The oxygen activity weight is obtained by comparing the ratio of the change in the number of inclusions ΔN. According to the average diameter change value Δd of the inclusions p The diameter weight is obtained by comparing the ratio of the change in the number of inclusions ΔN. The quantity weight is obtained based on the change in the number of inclusions, ΔN. The weight coefficients k1, k2, k3, and k4 in the above weights are preset.

[0089] In one specific embodiment, the argon flow rate adjustment ratio k Q The calculation can be performed using the following formula:

[0090]

[0091] In a specific embodiment, the total argon flow rate Q for the current cycle can be calculated using the following formula:

[0092] Q = k Q ·Q0 (2)

[0093] In the formula, Q0 is a preset argon flow rate baseline value, or it can be the total argon flow rate of the previous cycle.

[0094] S30: Based on the pre-set argon gas allocation rules, the argon gas flow rate of each partition in the current period is obtained according to the total argon gas flow rate of the current period, and the argon gas flow rate of each partition is adjusted.

[0095] Specifically, six sets of microporous permeable bricks (each set with a diameter of Φ150mm) are evenly arranged at the bottom of the LF furnace in a ring (spaced 200mm apart), and each set is connected to an independent argon gas pipeline (pressure resistant ≥1MPa).

[0096] Specifically, the breathable brick has a pore diameter of 0.2mm and a porosity of 35%, ensuring that the argon bubble size is ≤1mm, thereby improving the adsorption efficiency of inclusions.

[0097] Specifically, the furnace bottom of the LF furnace is divided into six zones, each with independently adjustable argon flow rates ranging from 30 to 150 Nm. 3 / h, it is necessary to ensure that the global Reynolds number Re ≥ 10. 5 This ensures turbulent mixing of the molten steel.

[0098] In one specific embodiment, the pre-set argon gas allocation rules include the argon gas flow rate values ​​for each partition or the argon gas flow rate allocation ratio for each partition when the total argon gas flow rate is different, and establish a mapping relationship between the total argon gas flow rate and the argon gas flow rate of each partition. Based on the total argon gas flow rate of the current period, the argon gas flow rate of each partition in the current period can be obtained. The pre-set argon gas allocation rules are determined in advance based on the flow field simulation results.

[0099] In one specific embodiment, each total argon flow rate also corresponds to multiple argon distribution schemes, each including the argon flow rate value of each partition or the argon flow rate distribution ratio of each partition. Each partition is coded. When obtaining the argon flow rate of each partition in the current period based on the total argon flow rate of the current period, the method further includes:

[0100] Obtain the number of inclusions and the average diameter of the inclusions in each zone;

[0101] Based on the pre-set limits for the number of inclusions in each zone and the average diameter limit for inclusions, determine whether the inclusions in each zone exceed the limits.

[0102] Based on whether the inclusions exceed the standard, a target argon gas allocation scheme is determined from multiple argon gas allocation schemes corresponding to the total argon gas flow rate in the current cycle, and the argon gas flow rate of each zone is adjusted according to the target argon gas allocation scheme.

[0103] In one specific embodiment, the multiple argon gas distribution schemes set for each total argon gas flow rate include a standard argon gas distribution scheme and an excess argon gas distribution scheme. The excess argon gas distribution scheme includes the argon gas distribution scheme corresponding to the excess in each zone, with the zone code as the identifier.

[0104] In one specific embodiment, the quantity limit for inclusions in each zone includes a first limit and a second limit for the quantity of inclusions in each zone, and the average diameter limit for inclusions in each zone includes a first limit and a second limit for the average diameter of inclusions in each zone. Specifically, determining whether inclusions in each zone exceed the limit includes: if the quantity of inclusions in each zone is greater than the preset first limit and less than the preset second limit, or if the average diameter of inclusions in each zone is greater than the preset first limit and less than the preset second limit, then the inclusions exceed the limit. Further, if the quantity of inclusions in each zone is greater than the preset second limit, or if the average diameter of inclusions in each zone is greater than the preset second limit, then an alarm message is sent.

[0105] In one specific embodiment, when it is determined that there is an excess of inclusions, the partition code for the excess inclusions is determined. Based on the partition code, a target argon distribution scheme is determined from multiple argon distribution schemes corresponding to the total argon flow rate of the current cycle. The argon flow rate of each partition is adjusted according to the target argon distribution scheme, which is the argon distribution scheme corresponding to the partition code. When it is determined that there is no excess of inclusions, a target argon distribution scheme is determined from multiple argon distribution schemes corresponding to the total argon flow rate of the current cycle. The argon flow rate of each partition is adjusted according to the target argon distribution scheme, which is the standard argon distribution scheme.

[0106] In one specific embodiment, reference Figure 4 As shown, after obtaining the argon flow rate of each partition in the current cycle, the method further includes:

[0107] S41: Obtain the density of molten steel, the density of inclusions, and the viscosity of molten steel;

[0108] S42: Calculate the average floating rate of the inclusions based on the density of the molten steel, the density of the inclusions, the viscosity of the molten steel, the temperature of the molten steel, the oxygen activity, and the average diameter of the inclusions;

[0109] S43: Based on the pre-set mapping relationship between argon blowing time and average buoyancy rate of inclusions, the argon blowing time is obtained according to the average buoyancy rate of the inclusions.

[0110] In one specific embodiment, the density and viscosity of molten steel are physical properties of molten steel and can be preset according to the type of steel. When the type of steel is determined, the density of inclusions in the molten steel can also be preset.

[0111] In one specific embodiment, the average buoyancy rate of the inclusions can be calculated using the following formula:

[0112]

[0113] in,

[0114] In the formula, v p ρ is the average buoyancy rate of the inclusions; g is the gravitational acceleration, which is preset; m The density of molten steel is preset; ρ p The density of inclusions is preset; d p C is the average diameter of the inclusions. O Oxygen activity; μ is the viscosity of molten steel, preset; T is the temperature of molten steel; C o,crit The oxygen activity threshold is preset; E a The activation energy is preset; R is the gas constant, preset.

[0115] The refining time required for molten steel to achieve a target purity (such as a specific TO value) is closely related to the average rising rate of inclusions. A slower rising rate requires a longer argon blowing time to allow the inclusions to float.

[0116] In a specific embodiment, the pre-set mapping relationship between argon blowing time and average inclusion rising rate is as follows: when v p When v > 0.8 mm / s, the argon blowing time is determined to be 28–30 min; when v p When the velocity is <0.8 mm / s, the argon blowing time should be extended by 2–5 minutes from the original argon blowing time of 28–30 minutes. p The smaller the value, the longer the blowing time. When vp < 0.8 mm / s, the blowing time can be extended proportionally based on the ratio between the average rising rate of inclusions and the preset rising rate of 0.8 mm / s, in addition to the blowing time of 28 to 30 minutes.

[0117] In one specific embodiment, reference Figure 3 As shown, before step S30 after obtaining the total argon flow rate for the current cycle, the method includes:

[0118] S24: Obtain the density and number of inclusions in molten steel;

[0119] S25: The argon stirring energy is obtained based on the molten steel density, the number of inclusions, and the total argon flow rate in the current cycle;

[0120] Based on a pre-set energy threshold, when the argon stirring energy is greater than the energy threshold, the argon flow rate of each zone in the current cycle is obtained based on the pre-set argon distribution rules and the total argon flow rate in the current cycle.

[0121] In one specific embodiment, the core function of argon gas stirring energy is as a quality verification indicator rather than a direct control parameter, used to verify whether the stirring intensity meets the requirements of the steel grade. The energy threshold is the minimum stirring energy required to meet the steel grade requirements and is preset according to the steel grade. When the argon gas stirring energy is greater than the energy threshold, it indicates that the argon gas stirring energy obtained based on the estimated total argon flow rate for the current cycle meets the requirements; when the argon gas stirring energy is less than the energy threshold, it indicates that the argon gas stirring energy obtained based on the estimated total argon flow rate for the current cycle does not meet the requirements, requiring an early warning and manual intervention to adjust the argon flow rate.

[0122] In one specific embodiment, the argon stirring energy E stir The following formula is used to calculate:

[0123]

[0124] In the formula, ζ is an empirical constant, set according to the experiment or operating conditions; ρ m The density of molten steel is preset; ρ g argon density, preset; Q is the total argon flow rate for the current cycle.

[0125] In one specific embodiment, after obtaining the molten steel temperature, oxygen activity, average inclusion diameter, and number of inclusions, the method includes:

[0126] S01: Obtain the type of molten steel and determine whether the molten steel is a Class I steel or a Class II steel;

[0127] S02: When the molten steel is a first type of steel, based on the pre-set first argon flow prediction model, the total argon flow rate of the current cycle is predicted according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions.

[0128] S03: When the molten steel is a second type of steel, based on the pre-set second argon flow prediction model, the total argon flow rate of the current cycle is predicted according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions.

[0129] In one specific embodiment, the type of molten steel is manually input. Type I steel refers to refined steel, and Type II steel refers to steel refined for the first time. A pre-set steel type dataset containing refined steel types is used. If the current type of molten steel is found in the dataset, it is determined to be Type I steel; if it is not found, it is determined to be Type II steel.

[0130] In one specific embodiment, steps S01 to S03 are applied in step S20 above.

[0131] In a specific embodiment, when the molten steel is a first type of steel, the pre-set first argon flow prediction model uses the above formulas (1) and (2) to predict the total argon flow in the current cycle.

[0132] In one specific embodiment, when the molten steel is a first-class steel, a pre-set second argon flow rate prediction model predicts the total argon flow rate Q of the current cycle according to the following formula:

[0133]

[0134] In the formula, ξ is an empirical constant, set according to requirements; in this embodiment, it is 0.8; n is a constant, determined through dimensionless analysis, and can be calibrated through laboratory furnace tests according to the steel grade (e.g., n = 1.2 for bearing steel, n = 1.0 for sulfur-containing steel); T is the temperature of the molten steel; d p C is the average diameter of the inclusions. o Oxygen activity; N inclusion denoted as the number of inclusions; μ(T) represents the viscosity of molten steel as a function of temperature.

[0135] In a specific embodiment, when the molten steel is a type 1 steel, the process of determining the argon flow rate of each zone in step S30 still requires the argon distribution rules determined based on simulation results.

[0136] As can be seen, in the above scheme, this application improves the accuracy of argon flow rate by calculating the total argon flow rate from multiple dimensions, including molten steel temperature, oxygen activity, average inclusion diameter, and inclusion quantity. Furthermore, by dynamically adjusting the argon flow rate of each zone within different cycles using argon distribution rules, the uniformity of stirring is improved. This application also improves the uniformity of stirring by considering the real-time distribution of inclusions through the average inclusion diameter and inclusion quantity.

[0137] 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.

[0138] In one embodiment, a dynamic argon blowing device for an LF furnace is provided, which corresponds one-to-one with the dynamic argon blowing method for an LF furnace described in the above embodiments. For example... Figure 5 As shown, the LF furnace dynamic argon blowing device includes an acquisition module 101, a estimation module 102, and a distribution module 103. Detailed descriptions of each functional module are as follows:

[0139] The acquisition module 101 is used to acquire the temperature of molten steel, oxygen activity, average diameter of inclusions, and number of inclusions.

[0140] The estimation module 102 is used to estimate the total argon flow rate of the current cycle based on a pre-set argon flow rate estimation model, according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions.

[0141] The allocation module 103 is used to obtain the argon flow rate of each partition in the current period based on the pre-set argon allocation rules and the total argon flow rate in the current period.

[0142] Specifically, the estimation module 102 is also used to calculate the absolute value of the temperature difference between the molten steel temperature and the reference temperature based on a preset reference temperature and a temperature deviation threshold, and to calculate the temperature ratio between the absolute value of the temperature difference and the temperature deviation threshold.

[0143] Based on a pre-set oxygen activity threshold, calculate the oxygen activity ratio between the oxygen activity and the oxygen activity threshold;

[0144] Based on a pre-set inclusion diameter threshold, the diameter ratio between the average diameter of the inclusion and the inclusion diameter threshold is calculated;

[0145] Based on a pre-set threshold for the number of inclusions, calculate the ratio between the number of inclusions and the threshold for the number of inclusions;

[0146] The argon flow rate adjustment ratio is obtained by summing the temperature ratio, the oxygen activity ratio, the diameter ratio, and the quantity ratio.

[0147] Based on a pre-set argon flow rate baseline, the total argon flow rate for the current cycle is estimated according to the argon flow rate adjustment ratio.

[0148] Specifically, the estimation module 102 is also used to calculate the changes in molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions between the current cycle and the previous cycle, based on the molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions.

[0149] The temperature weight is obtained based on the ratio of the change in molten steel temperature to the change in the number of inclusions.

[0150] The oxygen activity weight is obtained based on the ratio of the change in oxygen activity to the change in the number of inclusions.

[0151] The diameter weight is obtained by the ratio of the change in the average diameter of the inclusions to the change in the number of inclusions.

[0152] The quantity weight is obtained based on the change in the number of inclusions;

[0153] The argon flow rate adjustment ratio is adjusted according to the temperature weight, the oxygen activity weight, the diameter weight, and the quantity weight.

[0154] Based on the preset argon flow rate baseline value, the total argon flow rate for the current cycle is estimated according to the adjusted argon flow rate adjustment ratio.

[0155] Specifically, the estimation module 102 is also used to obtain the type of molten steel and determine whether the molten steel is a first-class steel or a second-class steel;

[0156] When the molten steel is a type 1 steel, the total argon flow rate for the current cycle is estimated based on a pre-set first argon flow rate prediction model, according to the molten steel temperature, the oxygen activity, the average diameter of the inclusions, and the number of inclusions.

[0157] When the molten steel is a type II steel, the total argon flow rate for the current cycle is estimated based on a pre-set second argon flow rate prediction model, according to the molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions.

[0158] The specific allocation module 103 is also used to obtain the density of molten steel and the number of inclusions;

[0159] The argon stirring energy is obtained based on the molten steel density, the number of inclusions, and the total argon flow rate in the current cycle.

[0160] Based on a pre-set energy threshold, when the argon stirring energy is greater than the energy threshold, the argon flow rate of each zone in the current cycle is obtained based on the pre-set argon distribution rules and the total argon flow rate in the current cycle.

[0161] Specifically, the allocation module 103 is also used to obtain the argon flow rate of each partition in the current period based on the mapping relationship between the pre-set total argon flow rate and the argon flow rate of each partition, and to adjust the argon flow rate of each partition.

[0162] Specifically, the allocation module 103 is also used to obtain the density of molten steel, the density of inclusions, and the viscosity of molten steel;

[0163] The average buoyancy rate of the inclusions is calculated based on the density of the molten steel, the density of the inclusions, the viscosity of the molten steel, the temperature of the molten steel, the oxygen activity, and the average diameter of the inclusions.

[0164] Based on the pre-set mapping relationship between argon blowing time and the average rising rate of inclusions, the argon blowing time is obtained according to the average rising rate of inclusions.

[0165] This invention provides a dynamic argon blowing device for an LF furnace. This application calculates the total argon flow rate from multiple dimensions, including molten steel temperature, oxygen activity, average inclusion diameter, and inclusion quantity, improving the accuracy of the argon flow rate. Furthermore, by using argon distribution rules, the argon flow rate of each zone is dynamically adjusted within different cycles, improving the uniformity of stirring. This application also considers the real-time distribution of inclusions by incorporating their average diameter and quantity, further enhancing the uniformity of stirring.

[0166] Specific limitations regarding the dynamic argon blowing device for the LF furnace can be found in the limitations of the dynamic argon blowing method for the LF furnace mentioned above, and will not be repeated here. Each module in the aforementioned dynamic argon blowing device for the LF furnace can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0167] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6 As shown. The computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile and / or volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used for communication with external devices via a network connection. When the computer program is executed by the processor, it implements the functions or steps of a dynamic argon blowing method for an LF furnace on the server side.

[0168] In one embodiment, a computer device is provided, which may be a device terminal, and its internal structure diagram may be as follows: Figure 7As shown, the computer device includes a processor, memory, network interface, display screen, and input devices connected via a system bus. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used to communicate with an external server via a network connection. When the computer program is executed by the processor, it implements the functions or steps of an LF furnace dynamic argon blowing method at the device end.

[0169] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the following steps:

[0170] Obtain the temperature of molten steel, oxygen activity, average diameter of inclusions, and number of inclusions;

[0171] Based on a pre-set argon flow rate prediction model, the total argon flow rate for the current cycle is predicted according to the molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions.

[0172] Based on the pre-set argon gas allocation rules, the argon gas flow rate of each zone in the current period is obtained according to the total argon gas flow rate of the current period, and the argon gas flow rate of each zone is adjusted.

[0173] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0174] Obtain the temperature of molten steel, oxygen activity, average diameter of inclusions, and number of inclusions;

[0175] Based on a pre-set argon flow rate prediction model, the total argon flow rate for the current cycle is predicted according to the molten steel temperature, oxygen activity, average diameter of inclusions, and number of inclusions.

[0176] Based on the pre-set argon gas allocation rules, the argon gas flow rate of each zone in the current period is obtained according to the total argon gas flow rate of the current period, and the argon gas flow rate of each zone is adjusted.

[0177] It should be noted that the functions or steps that can be implemented by the computer-readable storage medium or computer device described above can be referred to the relevant descriptions on the server side and device side in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0178] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0179] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0180] 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 dynamic argon blowing in an LF furnace, characterized in that, The method comprises: obtaining the temperature of the molten steel, the oxygen activity, the average diameter of the inclusions, and the number of inclusions; based on a pre-set argon flow estimation model, estimating the total argon flow in the current period according to the temperature of the molten steel, the oxygen activity, the average diameter of the inclusions, and the number of inclusions; based on a pre-set argon distribution rule, obtaining the argon flow of each sub-zone in the current period according to the total argon flow in the current period, and adjusting the argon flow of each sub-zone.

2. The LF furnace dynamic argon blowing method according to claim 1, wherein based on a pre-set argon flow estimation model, estimating the total argon flow in the current period according to the temperature of the molten steel, the oxygen activity, the average diameter of the inclusions, and the number of inclusions, comprises: based on a pre-set reference temperature and a temperature deviation threshold, calculating the absolute value of the temperature difference between the temperature of the molten steel and the reference temperature, and calculating the temperature ratio between the absolute value of the temperature difference and the temperature deviation threshold; based on a pre-set oxygen activity threshold, calculating the oxygen activity ratio between the oxygen activity and the oxygen activity threshold; based on a pre-set inclusion diameter threshold, calculating the diameter ratio between the average diameter of the inclusions and the inclusion diameter threshold; based on a pre-set inclusion quantity threshold, calculating the quantity ratio between the number of inclusions and the inclusion quantity threshold; summing the temperature ratio, the oxygen activity ratio, the diameter ratio, and the quantity ratio to obtain an argon flow adjustment ratio; based on a pre-set argon flow reference value, estimating the total argon flow in the current period according to the argon flow adjustment ratio.

3. The LF furnace dynamic argon blowing method according to claim 2, wherein based on a pre-set argon flow estimation model, estimating the total argon flow in the current period according to the temperature of the molten steel, the oxygen activity, the average diameter of the inclusions, and the number of inclusions, further comprises: calculating the change values of the temperature of the molten steel, the oxygen activity, the average diameter of the inclusions, and the number of inclusions between the current period and the previous period according to the temperature of the molten steel, the oxygen activity, the average diameter of the inclusions, and the number of inclusions; obtaining a temperature weight according to the ratio of the change value of the temperature of the molten steel to the change value of the number of inclusions; obtaining an oxygen activity weight according to the ratio of the change value of the oxygen activity to the change value of the number of inclusions; obtaining a diameter weight according to the ratio of the change value of the average diameter of the inclusions to the change value of the number of inclusions; obtaining a quantity weight according to the change value of the number of inclusions; adjusting the argon flow adjustment ratio according to the temperature weight, the oxygen activity weight, the diameter weight, and the quantity weight; based on a pre-set argon flow reference value, estimating the total argon flow in the current period according to the adjusted argon flow adjustment ratio.

4. The LF furnace dynamic argon blowing method according to claim 1, wherein after estimating the total argon flow in the current period, the method comprises: obtaining the density of the molten steel and the number of inclusions; According to the molten steel density, the inclusion quantity and the total argon flow rate of the current period, an argon stirring energy is obtained; When the argon stirring energy is greater than the energy threshold value based on the pre-set energy threshold value, according to the total argon flow rate of the current period, a current period argon flow rate of each sub-zone is obtained based on a pre-set argon distribution rule.

5. The LF furnace dynamic argon blowing method according to claim 1, wherein, According to the total argon flow rate of the current period, a current period argon flow rate of each sub-zone is obtained based on a pre-set argon distribution rule, and the argon flow rate of each sub-zone is adjusted, including: According to the total argon flow rate of the current period, a current period argon flow rate of each sub-zone is obtained based on a pre-set mapping relationship between the total argon flow rate and the argon flow rate of each sub-zone, and the argon flow rate of each sub-zone is adjusted.

6. The LF furnace dynamic argon blowing method according to claim 1, wherein, After the current period argon flow rate of each sub-zone is obtained, the method further includes: obtaining the molten steel density, the inclusion density, the molten steel viscosity; According to the molten steel density, the inclusion density, the molten steel viscosity, the molten steel temperature, the oxygen activity and the inclusion average diameter, an inclusion average floating rate is calculated; According to the inclusion average floating rate, a blowing time is obtained based on a pre-set mapping relationship between the blowing time and the inclusion average floating rate.

7. The LF furnace dynamic argon blowing method according to claim 1, wherein, After the molten steel temperature, the oxygen activity, the inclusion average diameter and the inclusion quantity are obtained, the method includes: obtaining the molten steel type, and determining whether the molten steel is a first type or a second type; When the molten steel is the first type, a current period total argon flow rate is estimated based on a pre-set first argon flow rate estimation model according to the molten steel temperature, the oxygen activity, the inclusion average diameter and the inclusion quantity; When the molten steel is the second type, a current period total argon flow rate is estimated based on a pre-set second argon flow rate estimation model according to the molten steel temperature, the oxygen activity, the inclusion average diameter and the inclusion quantity; 8. A LF furnace dynamic argon blowing device, characterized in that, including: an obtaining module, configured to obtain the molten steel temperature, the oxygen activity, the inclusion average diameter and the inclusion quantity; an estimation module, configured to estimate a current period total argon flow rate based on a pre-set argon flow rate estimation model according to the molten steel temperature, the oxygen activity, the inclusion average diameter and the inclusion quantity; a distribution module, configured to obtain a current period argon flow rate of each sub-zone based on a pre-set argon distribution rule according to the total argon flow rate of the current period, and adjust the argon flow rate of each sub-zone.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the steps of the LF furnace dynamic argon blowing method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 9. The computer program is executed by the processor to realize the steps of the LF furnace dynamic argon blowing method according to any one of claims 1 to 7.

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