Converter oxygen lance nozzle sealing device and control method

Abstract

This invention discloses a converter oxygen lance nozzle sealing device and control method, belonging to the field of iron and steel metallurgy technology. The device includes a frame positioned above the oxygen lance nozzle, a sealing baffle with a through hole installed within the frame, a driving mechanism for moving the sealing baffle, a position detection unit for detecting the oxygen lance position, and a control unit. The control unit controls the sealing baffle to move to a sealing position to close the oxygen lance nozzle when the oxygen lance leaves the nozzle, and to move to an open position before the oxygen lance enters the nozzle, allowing the oxygen lance to pass through the through hole. This invention solves the problem of flue gas overflow and environmental pollution caused by the lack of a seal at the oxygen lance nozzle when it is in standby or during replacement. It achieves automatic sealing of the oxygen lance nozzle at all times, has a simple and reliable structure, does not interfere with existing nitrogen sealing systems, and is suitable for widespread application in the converter steelmaking industry.

Description

Technical Field

[0001] This invention belongs to the field of iron and steel metallurgy technology, specifically relating to a converter oxygen lance nozzle sealing device and control method. Background Technology

[0002] In converter steelmaking, the oxygen lance is the core equipment for blowing oxygen into the molten pool to carry out the smelting reaction. The oxygen lance is inserted into the furnace through the oxygen lance nozzle above the furnace body for blowing operations. To prevent the large amount of high-temperature, dust-laden flue gas generated inside the furnace during blowing from escaping through the annular gap between the oxygen lance nozzle and the lance, thus polluting the workshop environment and causing heat radiation, current technology generally installs a nitrogen sealing plug on the oxygen lance body and a matching nitrogen sealing seat above the fixed oxygen lance nozzle in the furnace body. When the oxygen lance descends to the working position, the nitrogen sealing plug and nitrogen sealing seat fit together, and nitrogen gas is introduced to form an air curtain seal, effectively preventing flue gas from escaping.

[0003] However, this traditional sealing method has a significant drawback: its sealing function is only effective when the oxygen lance is in the "working position." In actual production, the oxygen lance is not always in the working position. During the production interval between two blowing cycles, the oxygen lance is raised to a higher "standby position" to wait; when the oxygen lance nozzle burns out and needs replacement, the oxygen lance needs to be fully raised to the "lance replacement point" for complete replacement. In both cases, the oxygen lance body and its built-in nitrogen plug are far from the oxygen lance nozzle, resulting in the oxygen lance nozzle being completely open. At this time, flue gas is still continuously generated in the converter (such as flue gas from the reaction of waste heat scrap steel and slag or flue gas formed by the combustion of air drawn into the furnace mouth). This flue gas will escape in large quantities from the open oxygen lance nozzle without organization, forming a strong "chimney effect." This not only causes flue gas to permeate the workshop, dust to exceed standards, and temperature to rise, deteriorating the working environment of operators, but also leads to the unorganized emission of pollutants, making it difficult to meet the increasingly stringent environmental regulations. This is a common environmental pain point that steel companies urgently need to solve. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the above problems and provide a converter oxygen lance nozzle sealing device and control method. By adding a sealing device to the oxygen lance nozzle and interlocking it with the oxygen lance position, the automatic sealing of the oxygen lance nozzle during standby or replacement can be achieved.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A converter oxygen lance nozzle sealing device, comprising: A sealing actuator, the sealing actuator including a movable sealing baffle, the sealing baffle being provided with a through hole allowing the oxygen lance body to pass through; A driving mechanism, connected to the sealing baffle, is used to drive the sealing baffle to move between a sealing position and an open position; A frame is fixedly installed above the oxygen lance nozzle of the converter, and the drive mechanism and the sealing baffle are installed inside the frame; A position detection unit, which is used to detect the real-time position of the oxygen lance body; The control unit is electrically connected to the drive mechanism and the position detection unit respectively. The control unit is configured to control the drive mechanism to operate according to the oxygen lance position signal detected by the position detection unit, so that the sealing baffle moves to the sealing position to seal the oxygen lance port when the oxygen lance body leaves the oxygen lance port, and moves to the opening position when the oxygen lance body is about to enter the oxygen lance port.

[0006] Furthermore, the sealing actuator is a gate valve structure, the sealing baffle is a plate-shaped baffle, and the driving mechanism is connected to the baffle through a connecting device to drive the baffle to reciprocate linearly in the horizontal direction.

[0007] Furthermore, the driving mechanism is a cylinder, the cylinder body is fixed on the frame, and its piston rod is connected to the insert plate through the connecting device.

[0008] Furthermore, the position detection unit is a laser rangefinder, which is installed at a fixed position on the frame or the oxygen lance lifting trolley to measure the distance between the oxygen lance body and the oxygen lance nozzle in real time.

[0009] Furthermore, the frame is connected to the oxygen lance nozzle nitrogen sealing seat fixed on the furnace body via a flange structure, and the oxygen lance nozzle nitrogen sealing seat is located directly above the oxygen lance nozzle.

[0010] Furthermore, a nitrogen sealing plug positioning block is fixed on the oxygen lance body, and a nitrogen sealing plug is mounted on the nitrogen sealing plug positioning block that can move up and down. When the oxygen lance is in the working position, the nitrogen sealing plug cooperates with the nitrogen sealing seat at the oxygen lance nozzle to form a seal. The through hole size on the sealing baffle is larger than the outer diameter of the nitrogen sealing plug to allow the nitrogen sealing plug to pass freely.

[0011] A control method for a converter oxygen lance nozzle sealing device as described above includes the following steps: S1: The position detection unit detects the position of the oxygen lance body in real time; S2: When the control unit determines that the oxygen lance body rises and exceeds the preset upper threshold point, it determines that the oxygen lance is about to leave the oxygen lance port. The control unit issues a command to drive the mechanism to move the sealing baffle to the sealing position and close the oxygen lance port. S3: When the control unit determines that the oxygen lance body is descending and has passed the preset lower threshold point, it determines that the oxygen lance is about to enter the oxygen lance port. The control unit issues a command to drive the mechanism to move the sealing baffle to the open position and open the oxygen lance port channel. S4: The oxygen lance body enters and exits the oxygen lance port through the through hole on the sealing baffle at the open position.

[0012] Furthermore, the upper threshold point is set between the oxygen lance changing point and the blowing waiting point, and the lower threshold point is set below the upper threshold point and above the blowing point.

[0013] Furthermore, after executing step S2 or S3, the control unit will receive feedback signals from the drive mechanism or the position sensor installed on the sealing baffle to confirm whether the sealing baffle has reached the predetermined position; if the positioning signal is not received within a preset time, an alarm will be triggered.

[0014] The beneficial effects of this invention are as follows: 1. Achieving full-cycle sealing of the oxygen lance nozzle and eradicating fugitive emissions: This invention fills the sealing gap between the oxygen lance's standby and changeover positions by adding an independent, automatically opening and closing sealing baffle. Regardless of the oxygen lance's state, as long as its nozzle is not sealed, the device automatically engages the sealing mechanism, effectively preventing flue gas from escaping from the oxygen lance nozzle throughout the entire converter production cycle. This solves the environmental pollution problem at its source, resulting in extremely significant environmental benefits.

[0015] 2. Enhanced Production Safety and Automation: The equipment employs fully automatic interlocking control, eliminating the need for manual intervention and avoiding safety risks such as burns and falls from heights that may arise from manual operation. Its control logic is seamlessly integrated with the existing oxygen lance lifting system, meeting the highly automated and intelligent production requirements of modern steelmaking workshops and improving the overall equipment technology level.

[0016] 3. Simple and reliable structure with strong adaptability: The device adopts a mature slide gate valve structure and pneumatic drive, resulting in a robust structure, reliable operation, and convenient maintenance. Its frame is connected to the existing oxygen lance nozzle nitrogen sealing seat via flanges, making modification and construction relatively simple. It can be widely applied to various converters with similar oxygen lance nozzle designs, and has good industry promotion value.

[0017] 4. Protects the original sealing function without interference: The sealing baffle and its through-hole design of this invention ensure that when the oxygen lance descends to the working position, the nitrogen sealing plug of the oxygen lance can pass through the through-hole without obstruction and cooperate normally with the original nitrogen sealing seat of the oxygen lance. The new device and the original nitrogen sealing system are functionally independent and complementary, together forming a more complete sealing system.

[0018] 5. Optimize the working environment and promote green production: Effectively curbing flue gas overflow significantly reduces dust concentration and temperature in the converter platform area, improves the working environment for operators, and reduces occupational health hazards. Simultaneously, the reduction in overflowing flue gas means that more flue gas is directed into the dust removal system for centralized treatment, improving dust removal efficiency, reducing total pollutant emissions, and helping steel companies achieve ultra-low emissions and green sustainable development goals.

[0019] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the converter oxygen lance in the working position in this invention.

[0021] Figure 2 This is a schematic diagram of the oxygen lance nozzle sealing device for the converter in this invention.

[0022] Figure 3 This is a control flowchart of the oxygen lance nozzle sealing device in the converter of the present invention.

[0023] Reference numerals in the attached drawings: 1-Oxygen lance nozzle nitrogen seal seat; 2-Oxygen lance nozzle; 3-Nitrogen seal plug; 4-Cylinder; 5-Insert plate; 6-Sealing mechanism frame; 7-Connecting device; 8-Oxygen lance body; 9-Nitrogen seal plug positioning block. Detailed Implementation

[0024] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0025] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Example 1 like Figures 1-2 As shown, this embodiment provides a sealing device suitable for the oxygen lance nozzle of a converter, used to seal the oxygen lance nozzle when the oxygen lance is in the non-working position to prevent flue gas from escaping from the furnace. The device specifically includes a sealing mechanism frame 6, a cylinder 4, a slide plate 5, a connecting device 7, a laser rangefinder (not shown in the figure), and a PLC control unit (not shown in the figure).

[0028] The sealing mechanism frame 6 serves as the skeleton and mounting platform of the entire device, with a flange at its bottom. This flange is connected to the upper flange of the oxygen lance nozzle nitrogen sealing seat 1, which is pre-welded and fixed to the converter body, via high-strength bolts. This allows the frame 6 to be installed vertically above the oxygen lance nozzle 2, with its central axis coinciding with the central axis of the oxygen lance nozzle 2. The frame 6 is a box-type structure, welded from heat-resistant steel plates. Its internal space is sufficient to accommodate the cylinder 4 and the insert plate 5, and guide rail grooves for the sliding of the insert plate 5 are machined on the inner walls of both sides. The top and sides of the frame 6 have reserved mounting interfaces for a laser rangefinder, as well as gas supply pipe interfaces and electrical wiring ports for the cylinder 4.

[0029] Cylinder 4 serves as the driving mechanism. Its cylinder body tail is hinged to the middle of one side of the inner wall of frame 6 via a pin seat, and the axis of cylinder 4 is horizontal. The piston rod head of cylinder 4 faces the other side of frame 6. The piston rod head is connected to one end of insert plate 5 via connecting device 7. Connecting device 7 employs a combination of spherical bearing and connecting pin. One end of the spherical bearing is threaded to the piston rod head of cylinder 4, and the other end is hinged to the connecting lug at the end of insert plate 5 via the connecting pin. This connection method allows insert plate 5 to perform horizontal linear reciprocating motion within the guide rail groove while compensating for slight offsets caused by installation errors or thermal deformation, ensuring smooth movement.

[0030] The insert plate 5 is a rectangular high-strength heat-resistant steel plate, horizontally installed inside the frame 6. Its two side edges are embedded in guide grooves on the inner wall of the frame 6, allowing it to slide freely in the horizontal direction. A circular through hole is opened at the center of the insert plate 5. The diameter of this through hole is designed to be larger than the maximum outer diameter of the nitrogen sealing plug 3 on the oxygen lance body 8, ensuring that the nitrogen sealing plug 3 can pass through the through hole without obstruction when the oxygen lance descends. One end of the insert plate 5 is equipped with a connecting ear plate, which is connected to the piston rod of the cylinder 4 through a connecting device 7; the other end is a free end, which can extend out of the frame 6 or retract into the frame 6 under the push of the cylinder 4. When the insert plate 5 is in the "sealed position", its through hole is offset from the center of the oxygen lance port 2, and the solid part of the insert plate 5 completely covers the channel section above the oxygen lance port 2, achieving physical sealing of the oxygen lance port; when the insert plate 5 is in the "open position", its through hole is precisely aligned with the center of the oxygen lance port 2, and the oxygen lance can freely enter and exit the oxygen lance port through the through hole.

[0031] The laser rangefinder, serving as a position detection unit, is mounted on the top outer side of the sealing mechanism frame 6 via a bracket, or on a fixed structure beside the oxygen lance lifting trolley track, with its laser emitter pointing downwards towards the oxygen lance lifting channel. The installation position of the laser rangefinder should ensure that its measuring beam can illuminate the outer surface of the oxygen lance body 8 or the characteristic components of the oxygen lance lifting trolley without obstruction, thereby obtaining real-time vertical position information of the oxygen lance. The signal output terminal of the laser rangefinder is connected to the analog input module of the PLC control unit via a shielded cable.

[0032] The PLC control unit is integrated into the automatic control system of the converter body, occupying an independent functional module or subroutine of the PLC. The PLC's digital output module controls the intake and exhaust direction of cylinder 4 through a solenoid valve, realizing the pushing out (sealing) and pulling back (opening) actions of the insert plate 5. The PLC simultaneously receives the position signal from the laser rangefinder and the feedback signals from the magnetic switches installed at both ends of the cylinder 4's stroke (sealing position signal and opening position signal), forming a complete closed-loop control.

[0033] This device operates independently of the original nitrogen sealing system of the oxygen lance. When the oxygen lance descends to the working position (blowing point), the nitrogen sealing plug 3 on the oxygen lance body 8 passes through the through hole of the insert plate 5 and cooperates with the nitrogen sealing seat 1 of the oxygen lance nozzle below the frame 6 to form the original nitrogen seal. At this time, the insert plate 5 is in the open position and does not affect the normal operation of the original sealing system at all. When the oxygen lance rises away from the oxygen lance nozzle, the insert plate 5 moves to the sealing position to independently seal the oxygen lance nozzle. The two sealing systems perform their respective functions and do not interfere with each other, working together to achieve full-time sealing of the converter oxygen lance nozzle.

[0034] Example 2 This embodiment provides an automatic control method using the sealing device in Embodiment 1. This method achieves full automation of oxygen lance nozzle sealing by establishing interlocking control logic between the oxygen lance lifting position and the opening and closing action of the sealing baffle.

[0035] Taking a typical converter as an example, the basic stroke parameters of the oxygen lance are as follows: the lance changing point is located at an elevation of 29.5m, the blowing waiting point is located at an elevation of 16.5m, and the blowing point is located at an elevation of 11.5m. Based on this, two key position thresholds are set: Upper threshold point H1: set at an elevation of 26.8m. This location is selected between the lance changing point (29.5m) and the blowing waiting point (16.5m), and close to the lance changing point, to ensure that the sealing device has completed the closing action after the oxygen lance rises away from the oxygen lance nozzle and before it reaches the lance changing point.

[0036] Lower threshold point H2: set at an elevation of 26.5m. This position is approximately 0.3m below the upper threshold point H1, ensuring that the sealing device opens before the oxygen lance passes through the nozzle during descent, providing sufficient safety margin.

[0037] Action confirmation timeout T: set to 5 seconds. That is, if the PLC does not receive a signal indicating that the sealing baffle is in place within 5 seconds after issuing the action command, the action is considered abnormal and an alarm is triggered.

[0038] The specific control process is as follows: Step S1: System initialization and readiness confirmation.

[0039] When the converter automation system starts, the PLC control unit loads the control subroutine for this sealing device. First, the PLC reads the current measurement value from the laser rangefinder to confirm that the position detection unit is working properly. Then, the PLC checks the status of the magnetic switches at both ends of cylinder 4 to confirm that the insert plate 5 is currently in a defined position (sealed or open), and the system is in a ready state. If the position detection unit communication is abnormal or the position of the insert plate 5 is uncertain, the PLC issues an alarm on the human-machine interface (HMI) to prompt the operator to check, and the system does not enter automatic control mode.

[0040] Step S2: The oxygen lance descends to the working position—the sealing device opens.

[0041] When the converter is ready for blowing operations, the oxygen lance begins to descend from the lance changing point (29.5m). The PLC continuously reads the real-time height value H of the oxygen lance using a laser rangefinder. When the value H drops below the upper threshold point H1 (26.8m), the PLC determines that the oxygen lance is descending and about to pass through the oxygen lance nozzle. It immediately outputs a signal to control the solenoid valve to switch, causing air to enter the rod chamber of cylinder 4 and exhaust from the rodless chamber. The piston rod retracts, pulling the slide plate 5 horizontally from the sealed position to the open position, aligning the through hole of the slide plate 5 with the center of the oxygen lance nozzle. At the same time, the PLC starts the position confirmation timer, waiting for the magnetic switch to send an "open in place" signal within the time limit T (5 seconds). If the signal is received within the time limit, the PLC confirms that the sealing device is fully open and allows the oxygen lance to continue descending. If the position confirmation signal is not received within the time limit, the PLC issues a "sealing device open timeout" alarm on the HMI and suspends the oxygen lance descent (triggers interlock protection). The descent can only be resumed after the operator confirms and handles the situation. The oxygen lance continues to descend, passing the blowing waiting point (16.5m) and arriving at the blowing point (11.5m) to carry out normal blowing operations. Throughout this process, the slide plate 5 remains in the open position.

[0042] Step S3: Blowing is complete, oxygen lance rises - sealing device closes.

[0043] After the blowing operation is completed, the oxygen lance begins to rise from the blowing point (11.5m). The oxygen lance continues to rise, passing through the blowing waiting point (16.5m). When the PLC detects through the laser rangefinder that the real-time height value H of the oxygen lance has risen above the upper threshold point H1 (26.8m), the PLC determines that the oxygen lance has moved beyond the safe distance above the oxygen lance nozzle and immediately outputs a signal to control the solenoid valve to reverse direction, causing air to enter the rodless chamber of cylinder 4 and exhaust from the rod chamber. The piston rod extends, pushing the insert plate 5 from the open position to the sealed position, with the solid part of the insert plate 5 completely covering the channel cross-section above the oxygen lance nozzle. Simultaneously, the PLC starts a position confirmation timer, waiting for a "sealed in place" signal within a time limit T (5 seconds). If this signal is received, it confirms that the sealing device is completely closed; if it is not received within the time limit, a "sealing device closed timeout" alarm is triggered. Afterward, the oxygen lance can continue to rise to the lance changing point (29.5m) for standby or lance changing operations. During the oxygen lance change point and throughout the entire change process, the insert plate 5 remains in a sealed position, the oxygen lance port is completely sealed, and the flue gas inside the furnace cannot escape from the oxygen lance port.

[0044] Step S4: Continuous sealing in standby mode.

[0045] During the production interval between two blowing operations, the oxygen lance remains at the blowing waiting point (16.5m) or rises to the lance changing point (29.5m) for standby. During this period, since the real-time height value H of the oxygen lance is always higher than the upper threshold point H1, the PLC always maintains the sealing position output signal of cylinder 4, and the plug plate 5 remains in the sealing position, ensuring that the oxygen lance port remains sealed throughout the standby period, with zero flue gas leakage.

[0046] Step S5: Exception handling and security protection.

[0047] In the above control process, the PLC continuously monitors the following abnormal operating conditions and takes corresponding actions: (1) If the laser rangefinder signal is lost or the measured value is abnormal (such as exceeding the reasonable range), the PLC will immediately issue a "position detection abnormality" alarm on the HMI and maintain the sealing device in the current position (maintain current status mode) to avoid malfunction.

[0048] (2) If the air source pressure of cylinder 4 is lower than the set minimum working pressure (e.g., 0.4MPa), the pressure sensor sends a low pressure signal to the PLC, the PLC issues an "insufficient air source pressure" alarm, and the sealing device maintains its current position.

[0049] (3) If the PLC detects that the position signal of the plug 5 is inconsistent with the instruction in two consecutive control cycles (such as issuing an opening instruction but receiving a sealing position signal), the PLC determines that it is mechanical jamming or sensor failure, issues an alarm for "abnormal operation of sealing device" and triggers interlock protection.

[0050] (4) All alarm information is displayed on the HMI with sound and light, and the alarm time, type and related parameter values ​​are recorded to facilitate maintenance personnel to trace and investigate.

[0051] Step S6: Manual operation mode.

[0052] In addition to the automatic control mode, this control method also provides a manual operation mode. The HMI has two operation buttons: "Manual Open Sealing Device" and "Manual Close Sealing Device." During maintenance, debugging, or in case of automatic system malfunction, the operator can directly control cylinder 4 to move the slide plate 5 to the desired position via the manual buttons. In manual operation mode, the position confirmation and abnormal alarm functions remain effective, but they are not interlocked with the oxygen lance lifting action; the operator must determine the appropriate timing for operation.

[0053] like Figure 3 As shown, taking a complete "blowing-standby-reblowing" production cycle as an example, the equipment status at each stage is as follows: The oxygen lance descends from 29.5m to below 26.8m: the sealing device opens, and the insert plate 5 is in the open position; The oxygen lance descends from 26.8m to 11.5m (blowing point): the sealing device remains open, and the oxygen lance continues to blow normally; As the oxygen lance rises from 11.5m to over 26.8m: the sealing device remains open; The oxygen lance continues to rise above 26.8m: the sealing device is closed, and the insert plate 5 is in the sealed position; The oxygen lance rises to 29.5m for standby or lance replacement: the sealing device remains sealed. In the next cycle, the oxygen lance descends from 29.5m to below 26.8m: the sealing device reopens.

[0054] Through the above control method, the opening and closing of the sealing device and the raising and lowering of the oxygen lance are precisely and automatically interlocked, ensuring that the oxygen lance port is in a reliable sealing state during all periods when the oxygen lance is away from the oxygen lance port, thus fundamentally solving the technical problem of unorganized leakage of flue gas from the oxygen lance port.

[0055] Finally, it should be noted that the above 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A converter oxygen lance nozzle sealing device, characterized in that, include: A sealing actuator, the sealing actuator including a movable sealing baffle, the sealing baffle being provided with a through hole allowing the oxygen lance body to pass through; A driving mechanism, connected to the sealing baffle, is used to drive the sealing baffle to move between a sealing position and an open position; A frame is fixedly installed above the oxygen lance nozzle of the converter, and the drive mechanism and the sealing baffle are installed inside the frame; A position detection unit, which is used to detect the real-time position of the oxygen lance body; The control unit is electrically connected to the drive mechanism and the position detection unit respectively. The control unit is configured to control the drive mechanism to operate according to the oxygen lance position signal detected by the position detection unit, so that the sealing baffle moves to the sealing position to seal the oxygen lance port when the oxygen lance body leaves the oxygen lance port, and moves to the opening position when the oxygen lance body is about to enter the oxygen lance port.

2. The converter oxygen lance nozzle sealing device according to claim 1, characterized in that, The sealing actuator is a gate valve structure, the sealing baffle is a plate-shaped baffle, and the driving mechanism is connected to the baffle through a connecting device to drive the baffle to reciprocate linearly in the horizontal direction.

3. The converter oxygen lance nozzle sealing device according to claim 2, characterized in that, The driving mechanism is a cylinder, the cylinder body is fixed on the frame, and its piston rod is connected to the insert plate through the connecting device.

4. The converter oxygen lance nozzle sealing device according to claim 1, characterized in that, The position detection unit is a laser rangefinder, which is installed at a fixed position on the frame or oxygen lance lifting trolley to measure the distance between the oxygen lance body and the oxygen lance nozzle in real time.

5. The converter oxygen lance nozzle sealing device according to claim 1, characterized in that, The frame is connected to the oxygen lance nozzle nitrogen seal seat fixed on the furnace body via a flange structure, and the oxygen lance nozzle nitrogen seal seat is located directly above the oxygen lance nozzle.

6. The converter oxygen lance nozzle sealing device according to claim 1, characterized in that, A nitrogen sealing plug positioning block is fixed on the oxygen lance body. A nitrogen sealing plug is mounted on the nitrogen sealing plug positioning block and can be moved up and down. When the oxygen lance is in the working position, the nitrogen sealing plug and the nitrogen sealing seat at the oxygen lance nozzle cooperate to form a seal. The through hole on the sealing baffle is larger than the outer diameter of the nitrogen sealing plug to allow the nitrogen sealing plug to pass freely.

7. A control method for a converter oxygen lance nozzle sealing device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1: The position detection unit detects the position of the oxygen lance body in real time; S2: When the control unit determines that the oxygen lance body rises and exceeds the preset upper threshold point, it determines that the oxygen lance is about to leave the oxygen lance port. The control unit issues a command to drive the mechanism to move the sealing baffle to the sealing position and close the oxygen lance port. S3: When the control unit determines that the oxygen lance body is descending and has passed the preset lower threshold point, it determines that the oxygen lance is about to enter the oxygen lance port. The control unit issues a command to drive the mechanism to move the sealing baffle to the open position and open the oxygen lance port channel. S4: The oxygen lance body enters and exits the oxygen lance port through the through hole on the sealing baffle at the open position.

8. The control method according to claim 7, characterized in that, The upper threshold point is set between the oxygen lance changing point and the blowing waiting point, and the lower threshold point is set below the upper threshold point and above the blowing point.

9. The control method according to claim 7, characterized in that, After executing step S2 or S3, the control unit receives feedback signals from the drive mechanism or the position sensor installed on the sealing baffle to confirm whether the sealing baffle has reached the predetermined position; if the positioning signal is not received within a preset time, an alarm is triggered.

Images