Online monitoring and processing method for abnormal bottom blowing of converter

Abstract

The invention relates to an online monitoring and processing method for bottom blowing abnormity of a converter. The method comprises the following steps: step 1, acquiring relevant data of a bottom blowing curve of the converter; step 2, acquiring real-time data in a bottom blowing process; and step 3, online monitoring and processing the bottom blowing abnormity. According to the technical scheme, the real-time oxygen blowing amount, the bottom blowing gas flow and the current bottom blowing gas type in the whole bottom blowing process can be tracked and monitored on line, and whether the current bottom blowing control process can meet the requirement for bottom blowing of the current steel grade set bottom blowing curve or not is judged in real time; and normal opening and closing (namely selection of gas types) of the nitrogen and argon cut-off valves and normal control (namely gas supply intensity) of the regulating valve are ensured, and common abnormal conditions of converter bottom blowing are effectively prevented, so that the bottom blowing process control can meet the molten steel quality requirement of the current production heat.

Description

Technical Field

[0001] The present invention relates to a processing method, specifically to an on-line monitoring and processing method for abnormal bottom blowing of a converter, belonging to the technical field of production and control in the metallurgical process. Background Technique

[0002] During the smelting process of a converter, in order to improve the insufficient stirring force of the top-blown converter, a combined top and bottom blowing process of blowing nitrogen and argon from the bottom of the converter is usually adopted.

[0003] The common control method for the bottom blowing of a converter is to select a corresponding bottom blowing curve according to information such as the steel grade composition and smelting path according to a pre-set bottom blowing curve, and perform nitrogen-argon switching according to the actual production situation, so as to realize the control of the gas type and gas flow rate in the entire bottom blowing process.

[0004] Due to the fact that the bottom blowing control of the current converter can basically achieve automatic control by a computer, the bottom blowing process is automatically executed, and due to reasons such as the tight on-site production rhythm, on-site operators cannot always pay attention to the gas type and flow rate in the entire bottom blowing process. Therefore, if the bottom blowing is abnormal, it may lead to the situation that the bottom blowing gas type is not switched to the required gas at the set switching moment or the gas flow rate does not reach the set requirement, resulting in the steel water composition not meeting the requirements of the steel grade and quality problems such as excessive nitrogen in the steel water.

[0005] Searching for relevant patents in this field, a method for switching nitrogen and argon in the bottom gas supply of a combined blowing converter, patent number: CN200610048348.3. The present invention discloses a method for switching nitrogen and argon in the bottom gas supply of a combined blowing converter. During blowing, the bottom gas supply is nitrogen. When the oxygen consumption of the furnace reaches 50% - 80% of the oxygen consumption of this furnace, it is switched from nitrogen to argon. Its characteristics are: during the smelting process, three more nitrogen-argon switches are added to the bottom gas supply. When measuring temperature, sampling and other analyses, when the furnace body is swung to 85° - 100° in the direction opposite to the tapping hole, the argon gas source is cut off and nitrogen is supplied to the furnace, switching from argon to nitrogen; after the temperature measurement, sampling and other analyses are completed, when the furnace body is swung towards the vertical 00 position, when the furnace body passes through 85° - 100° again, the nitrogen gas source is cut off and argon is supplied to the furnace, switching from nitrogen to argon; when the furnace body is swung from the 00 position to 90° - 100° in the direction of the tapping hole during the tapping of the combined blowing converter, the argon gas source is cut off and nitrogen is supplied to the furnace, switching from argon to nitrogen. This method, without affecting the quality of the finished steel, replaces argon with nitrogen, shortens the time of bottom blowing with argon, saves argon consumption, and reduces the smelting cost.

[0006] Method for smelting stainless steel in top-bottom combined blown converter, Patent No.: CN200710139588.9. The present invention discloses a method for smelting stainless steel in a top-bottom combined blown converter, which comprises the following steps in sequence: I. Pour molten iron into the top-bottom combined blown converter and add coke, and blow oxygen and argon for smelting; II. When the temperature of the molten steel is higher than 1600 °C, add ferromanganese, ferrochrome alloy, oxygen and argon for smelting, and add slag materials to adjust the slag; III. When the temperature of the molten steel is higher than 1630 °C, add ferromanganese and ferrochrome alloy again, and blow oxygen and argon for smelting, and add slag materials to adjust the slag; IV. When the actually measured temperature of the molten steel is higher than the calculated temperature, add the remaining alloys, namely ferromanganese, ferrochrome and nickel, and blow oxygen and argon for smelting, and add lime and a small amount of fluorite to adjust the slag; V. Gradually reduce the oxygen blowing amount and gradually increase the argon blowing amount; VI. Stop bottom blowing oxygen and only blow argon for stirring for 1.5 to 2.5 minutes; VII. Add ferrosilicon and add slag materials; VIII. The reduction bottom blowing argon stirring time is ≥5 minutes; IX. Take samples to analyze the composition and tap the steel. The method for smelting stainless steel in the present top-bottom combined blown converter has low cost.

[0007] Method for controlling low oxygen content at the end point of a top-bottom combined blown converter with large gas volume, Patent No.: CN200710052076.9. The method for controlling low oxygen content at the end point of a top-bottom combined blown converter with large gas volume in the present invention relates to a method for controlling low oxygen content in a combined blown converter. Aiming at the problem of insufficient bottom blowing gas volume existing in the smelting process of the current combined blown converter, the present invention provides a method for controlling low oxygen content at the end point of a top-bottom combined blown converter with large gas volume, which controls the increase of the combined blowing gas volume of the permeable brick when the converter is working, that is, dredges the permeable brick when the converter is not working. The present invention ensures the combined blowing gas flow rate from the perspective of the permeable brick, reduces energy consumption, increases the efficiency of the same amount of gas flow, improves the quality of molten steel and reduces production costs.

[0008] Blowing blockage removal and reconnection device and method for bottom blowing gas supply element of combined blown converter, Patent No.: CN200510085270.8. Using the blowing blockage removal and reconnection device for the bottom blowing gas supply element of a combined blown converter, taking air as the blowing and blocking gas source, blowing air into the blocked bottom blowing gas supply element, and continuously oxidizing the blockage in the bottom blowing gas supply element, namely the "slag-metal" mushroom head, by 20% of the oxygen in the air, so as to keep the "slag-metal" mushroom head in a reasonable shape and ensure that the service life of the bottom blowing gas supply element is synchronized with the furnace lining.

[0009] Among the technologies described in the above 4 patents, in the first patent, without affecting the quality of the finished steel, by replacing argon with nitrogen, the time of bottom blowing argon is shortened, the consumption of argon is saved, and the smelting cost is reduced; the second patent is mainly a method for smelting stainless steel in a top-bottom combined blowing converter with a lower smelting cost; the third patent is to ensure the flow rate of the combined blowing gas from the perspective of the porous plug, solve the problem of insufficient bottom blowing gas volume during the smelting process of the combined blowing converter, increase the efficiency of the same amount of gas flow, improve the quality of molten steel and reduce the production cost. The 4th patent is to improve the service life of the bottom blowing gas supply element by blowing air into the blocked bottom blowing element. The technology in the present invention is different from the above patents. In the present invention, during the production process of the converter, on-line monitoring and treatment are carried out on the bottom blowing process of the converter, that is, the common bottom blowing abnormalities in the actual smelting process of the converter are monitored, and corresponding abnormality treatment is carried out in a timely manner according to the actual situation, so as to meet the quality requirements of the converter molten steel and save the smelting cost, which is essentially different from the above patents. Therefore, there is an urgent need for a new solution to solve the above technical problems. Summary of the Invention

[0010] The present invention precisely aims at the problems existing in the prior art and provides an on-line monitoring and treatment method for bottom blowing abnormalities in a converter. This technical solution can on-line track and monitor the real-time oxygen blowing amount, bottom blowing gas flow rate and the current bottom blowing gas type during the entire bottom blowing process, and can judge in real time whether the current bottom blowing control process can meet the set bottom blowing curve of the current steel grade for bottom blowing. Through real-time monitoring, it is ensured that the opening and closing of the nitrogen and argon cut-off valves (i.e., the selection of gas types) and the control of the regulating valve (i.e., the gas supply intensity) are normal, effectively preventing the occurrence of common bottom blowing abnormalities in the converter, so as to ensure that the bottom blowing process control can meet the quality requirements of the molten steel of the current production heat. This technology determines whether the currently executed bottom blowing curve is consistent with the issued bottom blowing curve, whether it meets the requirements of the steel grade, and whether nitrogen-argon switching is carried out in a timely manner according to the standard composition by obtaining the relevant data of bottom blowing control, and by real-time collecting the bottom blowing gas type, gas flow rate and the current real-time oxygen blowing amount of the current heat. If the gas types are inconsistent, a bottom blowing gas switching valve signal will be issued in a timely manner, and an abnormal alarm will be issued to L1 to notify gas switching. When it is monitored that the switching is normal, a nitrogen-argon switching abnormality reset signal will be issued to cancel the alarm information; if the gas flow rate does not reach the required issued flow rate, the flow rate adjustment coefficient of the corresponding bottom blowing branch pipe will be adjusted to adjust the bottom blowing flow rate, so as to realize the on-line monitoring and timely treatment of bottom blowing abnormalities and prevent problems affecting the quality of molten steel due to abnormal bottom blowing control resulting in nitrogen exceeding the standard.

[0011] In order to achieve the above object, the technical solution of the present invention is as follows: an on-line monitoring and treatment method for bottom blowing abnormalities in a converter, the method comprising the following steps:

[0012] Step 1, obtain the relevant data of the converter bottom blowing curve,

[0013] Step 2, Real-time data acquisition during bottom blowing

[0014] Step 3, Online monitoring and handling of bottom blowing abnormalities

[0015] Among them, for Step 1, obtaining data related to the bottom blowing curve of the converter, specifically as follows: Obtain the relevant data information of the bottom blowing curve executed during the bottom blowing process of the converter. This data is calculated by the bottom blowing model of the converter. At the beginning of the heat, the bottom blowing curve calculation module is called according to the steel grade information calculated for production, and the bottom blowing control curve is sent to the bottom blowing PLC system, including the gas types (mainly nitrogen and argon) and gas flow rates of the bottom blowing curve, as well as the oxygen content for nitrogen-argon switching, which is used to control the opening or closing of the bottom blowing nitrogen or argon valves and control the valve opening of the bottom blowing branch pipes according to the set flow rate.

[0016] Among them, for Step 2, real-time data acquisition during bottom blowing, specifically as follows: After the start of the heat, collect the detailed data of the on-site bottom blowing control system periodically. Real-time collect the current gas type and gas flow rate of bottom blowing, as well as the real-time oxygen blowing amount information every 2 seconds, and record all bottom blowing-related data for tracking the on-site bottom blowing control situation.

[0017] Among them, for Step 3, online monitoring and handling of bottom blowing abnormalities, the online monitoring and handling of bottom blowing process control mainly monitor the common bottom blowing abnormalities during the actual smelting process of the converter and perform corresponding abnormality handling according to the actual situation to meet the production requirements on the converter site. Specifically as follows:

[0018] (1) Abnormality monitoring and handling of the bottom blowing control curve not matching the actual steel grade. Since the steel grade may be changed during the production process of the converter after the start of the heat, and the bottom blowing control of the converter is calculated and the bottom blowing curve is sent at the start of the heat, the change of the steel grade after the start of the heat will cause the bottom blowing curve calculated by the model to not meet the changed steel grade. Compare the current steel grade with the steel grade at the start of the heat again at the moment of hot metal charging and the start of blowing. When there is an abnormality of inconsistent steel grades, call the bottom blowing model to calculate again and send the bottom blowing curve to the bottom blowing PLC system again to update the control mode of the bottom blowing process, and solve the problem that the bottom blowing curve does not match the changed steel grade caused by the change of the steel grade after the start of the heat.

[0019] (2) Abnormality monitoring and handling of the bottom blowing gas flow rate not reaching the set requirements. By online monitoring the types and flow rate changes of nitrogen and argon, and comparing them with the gas types and flow rates that should be implemented for the current steel grade, it is possible to judge whether the actual flow rate of bottom blowing meets the quality requirements while saving the consumption of bottom blowing gas. When the gas flow rate cannot reach the set flow rate requirement, automatically adjust and send the single-branch pipe adjustment coefficient to control the valve opening of the single-branch pipe control valve and adjust the flow rate.

[0020] (3) Abnormal monitoring and handling of whether the bottom-blowing nitrogen-argon gas switching is timely. There are generally two types of bottom-blowing curves in a converter. One is the type that requires nitrogen-argon switching during the blowing process, and the other is the type of steel grade that does not require nitrogen-argon switching and blows nitrogen or argon throughout the process. For the steel grades that require nitrogen-argon switching, it is also necessary to monitor the real-time oxygen blowing amount, judge the deviation between it and the oxygen amount at the moment of bottom-blowing nitrogen-argon switching, and solve the problem of abnormal nitrogen-argon switching by determining whether the pipeline valves of nitrogen and argon are closed or opened in a timely manner, that is, whether the gas switching is realized in a timely manner. When the actual argon blowing amount has exceeded the switching oxygen amount and still has not switched to the correct bottom-blowing gas type, a nitrogen-argon switching signal will be sent, and an abnormal alarm will be sent to L1 to notify the gas switching. When it is monitored that the switching is normal, a nitrogen-argon switching abnormal reset signal will be sent to cancel the alarm information.

[0021] Compared with the prior art, the present invention has the following advantages. An online monitoring and handling method for abnormal bottom-blowing in a converter is based on the automatic control of the bottom-blowing process. By tracking and monitoring the bottom-blowing control process in real time, it identifies possible abnormalities in the bottom-blowing process and automatically performs corresponding abnormal handling, solves the problem of molten steel quality caused by abnormal bottom-blowing on-site, thus ensuring that the molten steel quality can meet the production requirements, preventing steel modification due to abnormal bottom-blowing, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flowchart of abnormal monitoring and handling of converter bottom-blowing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To deepen the understanding of the present invention, the following will give a detailed description of this embodiment in conjunction with the drawings.

[0024] Embodiment 1:

[0025] An online monitoring and handling method for abnormal bottom-blowing in a converter of this embodiment includes the following steps:

[0026] 1. Obtain relevant data of the converter bottom-blowing curve

[0027] Obtain relevant data information of the bottom-blowing curve executed during the bottom-blowing process of the converter. This data is calculated by the bottom-blowing model of the converter. At the start of the heat, the bottom-blowing model calls the bottom-blowing curve calculation module according to the production calculated steel grade information, and issues the bottom-blowing control curve to the bottom-blowing PLC system, including the bottom-blowing curve gas type (mainly nitrogen and argon) and gas flow rate, as well as the nitrogen-argon switching oxygen amount, etc., for controlling the opening or closing of the bottom-blowing nitrogen or argon valve, and controlling the valve opening of the bottom-blowing branch pipe according to the set flow rate.

[0028] (1) Obtain the initial information of the current production heat in the converter, including steel grade, standard composition information, etc. The current steel grade being smelted is: DT5854A1, and the detailed standard information is shown in the following table:

[0029]

[0030]

[0031] Table 1 Initial Information Table of the Current Production Heat

[0032] (2) Obtain the information sent down by the bottom blowing model calculation curve, including the types and flow rates of bottom blowing gases corresponding to each stage of converter production, oxygen amount for nitrogen-argon switching, etc. The current heat corresponds to bottom blowing curve 2, and the oxygen amount for nitrogen-argon switching is 1697m 3 . The types and flow rates of bottom blowing corresponding to each production stage of bottom blowing curve 2 are shown in the following table:

[0033]

[0034] Table 2 Information Table of the Bottom Blowing Model Calculation Curve Sent Down

[0035] 2. Real-time Data Acquisition during Bottom Blowing

[0036] After the start of the heat, collect the detailed data of the on-site bottom blowing control system periodically. Real-time collect the type and flow rate of the current bottom blowing gas, as well as the real-time oxygen blowing amount information every 4 seconds, and record all bottom blowing-related data for tracking the on-site bottom blowing control situation.

[0037] Implementation Example Table 3 Real-time Bottom Blowing Data Collected Periodically (Gas Type 1: Argon, 2: Nitrogen)

[0038]

[0039] 3. Online Monitoring and Handling of Bottom Blowing Abnormalities

[0040] The online monitoring and handling of bottom blowing process control mainly monitor the common bottom blowing abnormalities in the actual smelting process of the converter, and perform corresponding abnormality handling according to the actual situation to meet the production requirements of the converter site.

[0041] (1) Abnormality Monitoring and Handling of Inconsistency between Bottom Blowing Control Curve and Actual Steel Grade

[0042] Since the steel grade may be changed after the start of the heat during the converter production process, and the bottom blowing control of the converter calculates and sends down the bottom blowing curve at the start of the heat, the change in steel grade after the start of the heat will cause the bottom blowing curve calculated by the model to not meet the changed steel grade.

[0043] At the moment of hot metal charging and the start of blowing, the current steel grade is retrieved again and compared with the steel grade at the start of the heat. Both are DT5854A1. If an abnormality of inconsistent steel grades occurs, the bottom blowing model will be called again to calculate and reissue the bottom blowing curve to the bottom blowing PLC system, and the control mode of the bottom blowing process will be updated in a timely manner to solve the problem that the bottom blowing curve does not match the changed steel grade after the start of the heat.

[0044] (2) Abnormality monitoring and handling of the bottom blowing gas flow not reaching the set requirements

[0045] By online monitoring the type and flow rate changes of nitrogen and argon, and comparing them with the gas type and flow rate that should be implemented for the current steel grade, it is possible to judge whether the actual flow rate of the bottom blowing meets the quality requirements while saving the consumption of the bottom blowing gas. When the gas flow rate cannot reach the set flow rate requirement, the single-branch pipe adjustment coefficient is automatically calculated and issued to control the valve opening of the single-branch pipe regulating valve to adjust the flow rate.

[0046] In this embodiment, the set flow rate is mainly between 3.8 and 11. 11 is the flow rate during strong stirring. The default value of the single-branch pipe adjustment coefficient is 1, indicating that the valve opening is 50%. The adjustment range is between 0.3 and 1.5. If the calculated adjustment coefficient is 0.8, the opening is: 50% * 0.8 = 40%; if the calculated gain coefficient is 1.4, the opening is: 50% * 1.4 = 70%.

[0047] (3) Abnormality monitoring and handling of whether the bottom blowing nitrogen-argon gas switching is timely

[0048] The bottom blowing curves of the converter are generally divided into two types. One is the steel grade that requires nitrogen-argon switching during the blowing process, and the other is the steel grade that blows nitrogen or argon throughout the process and does not require nitrogen-argon switching. For the steel grades that require nitrogen-argon switching, the real-time oxygen blowing amount also needs to be monitored to judge the deviation from the oxygen amount at the bottom blowing nitrogen-argon switching moment.

[0049] By determining whether the nitrogen and argon pipeline valves are closed or opened in a timely manner when reaching the switching oxygen blowing amount, that is, whether the nitrogen-argon switching is realized in a timely manner. When the actual argon blowing amount has exceeded the switching oxygen amount and has not yet been switched to the correct bottom blowing gas type, the nitrogen-argon switching signal will be issued, and an abnormal alarm will be issued to L1 to notify the bottom blowing abnormality. When it is monitored that the switching is normal, the nitrogen-argon switching abnormality reset signal will be issued to cancel the alarm information.

[0050] In this embodiment, the steel grade DT5854A1 is a nitrogen-argon switching steel grade. According to the bottom blowing model calculation, the nitrogen-argon switching oxygen amount is

[0051] 1697m 3 , considering data transmission delay, etc., it is set that:

[0052] Switching oxygen volume = Calculated switching oxygen volume + Delayed oxygen volume parameter. Here, the value of the delayed oxygen volume parameter is 500. Therefore, the switching oxygen volume = 1697 + 500 = 2197 (m 3 )

[0053] When the current real-time oxygen volume ≥ the comparison switching oxygen volume and the current bottom blowing gas type does not match the actually issued gas type, an alarm notification is issued, and the valve switching signal is issued again. Until the abnormality is reset, an alarm cancellation message is issued.

[0054] It should be noted that the above embodiments are not used to limit the protection scope of the present invention. Equivalent transformations or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

[0055] The present invention is an on-line monitoring and processing method for abnormal bottom blowing of a converter. Based on the automatic control of the bottom blowing process, it tracks and on-line monitors the bottom blowing control process in real time, identifies possible abnormalities in the bottom blowing process, and automatically performs corresponding abnormality processing, solving the problem of molten steel quality caused by abnormal bottom blowing on site, thus ensuring that the molten steel quality can meet the requirements of steel grades, preventing problems such as excessive nitrogen caused by abnormal bottom blowing, and being beneficial to reducing the smelting cost.

[0056] Through practice, it is proved that after the on-line monitoring and processing method for abnormal bottom blowing is put into use, it effectively reduces the abnormal conditions of on-site bottom blowing control, significantly reduces the molten steel quality problems caused by bottom blowing problems, and the implementation effect is remarkable.

[0057] It should be noted that the above embodiments are not used to limit the protection scope of the present invention. Equivalent transformations or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. An on-line monitoring and processing method for abnormal bottom blowing of a converter, characterized in that The method includes the following steps: Step 1: Obtain data related to the bottom blowing curve of the converter. Step 2: Collect real-time data during the bottom blowing process. Step 3: Conduct on-line monitoring and handling of bottom blowing abnormalities.

2. The on-line monitoring and processing method for abnormal bottom blowing of a converter according to claim 1, characterized in that Step 1: Obtain data related to the bottom blowing curve of the converter, specifically as follows: Obtain the relevant data information of the bottom blowing curve executed during the bottom blowing process of the converter. This data is calculated by the bottom blowing model of the converter. At the beginning of the heat, the bottom blowing curve calculation module is called according to the steel grade information calculated for production, and the bottom blowing control curve is sent to the bottom blowing PLC system, including the gas type and gas flow rate of the bottom blowing curve, as well as the oxygen content for nitrogen-argon switching, which is used to control the opening or closing of the bottom blowing nitrogen or argon valves and control the valve opening of the bottom blowing branch pipes according to the set flow rate.

3. The on-line monitoring and processing method for abnormal bottom blowing of a converter according to claim 1, characterized in that Step 2: Collect real-time data during the bottom blowing process, specifically as follows: After the start of the heat, collect the detailed data of the on-site bottom blowing control system periodically. Real-time collect the gas type and gas flow rate of the current bottom blowing, as well as the real-time oxygen blowing amount information every 2 seconds, and record all data related to bottom blowing to track the on-site bottom blowing control situation.

4. The on-line monitoring and processing method for abnormal bottom blowing of a converter according to claim 1, characterized in that, Step 3: Conduct on-line monitoring and handling of bottom blowing abnormalities. The on-line monitoring and handling of the bottom blowing process control mainly monitor the common bottom blowing abnormalities in the actual smelting process of the converter and perform corresponding abnormality handling according to the actual situation to meet the production requirements of the converter site, specifically as follows: (1) Abnormal monitoring and handling of the bottom blowing control curve not matching the actual steel grade. During the production process of the converter, it often occurs that the steel grade is changed after the start of the heat. The bottom blowing control of the converter calculates and issues the bottom blowing curve at the start of the heat. Therefore, the change of the steel grade after the start of the heat will cause the bottom blowing curve calculated by the model to not meet the requirements of the changed steel grade. At the moment of hot metal charging and the start of blowing, the current steel grade and the steel grade at the start of the heat are retrieved again for comparison. When there is an abnormality in the inconsistent steel grades, the bottom blowing model is called again to calculate and the bottom blowing curve is reissued to the bottom blowing PLC system to update the control mode of the bottom blowing process, solving the problem that the bottom blowing curve does not match the changed steel grade after the start of the heat. (2) Abnormal monitoring and handling of the bottom blowing gas flow not reaching the set requirements. By online monitoring the type and flow rate changes of nitrogen and argon, and comparing them with the gas type and flow rate that should be implemented for the current steel grade, it is possible to judge whether the actual flow rate of the bottom blowing meets the quality requirements while saving the consumption of the bottom blowing gas. When the gas flow rate cannot reach the set flow rate requirement, the single-branch pipe adjustment coefficient is automatically adjusted and issued to control the valve opening of the single-branch pipe regulating valve to adjust the flow rate. (3) Abnormal monitoring and handling of whether the nitrogen-argon gas switching of the bottom blowing is timely. The bottom blowing curve of the converter is divided into two types. One is the type that requires nitrogen-argon switching during the blowing process, and the other is the steel grade that does not require nitrogen-argon switching and blows nitrogen or argon throughout the process. For the steel grade that requires nitrogen-argon switching, the real-time oxygen blowing amount also needs to be monitored to judge the deviation from the oxygen blowing amount at the moment of nitrogen-argon switching of the bottom blowing. The problem of abnormal nitrogen-argon switching is solved by judging whether the valves of the nitrogen and argon pipelines are closed or opened in time, that is, whether the gas switching is realized in time. When the actual argon blowing amount has exceeded the switching oxygen amount and still has not been switched to the correct bottom blowing gas type, the nitrogen-argon switching signal will be issued, and an abnormal alarm will be issued to L1 to notify the gas switching. When it is monitored that the switching is normal, the nitrogen-argon switching abnormal reset signal will be issued to cancel the alarm information.

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