A device and method for improving nitrogen sealing effect of oxygen lance

Abstract

The present invention discloses a device for improving the nitrogen sealing effect of an oxygen lance, comprising a lifting and transverse movement device and a nitrogen sealing seat located at a floor above a converter, the nitrogen sealing seat being embedded in the floor, a first nitrogen sealing device and a second nitrogen sealing device being arranged in the nitrogen sealing seat, the lifting and transverse movement device being used to control the transverse and vertical movement of the first nitrogen sealing device and the second nitrogen sealing device, the first nitrogen sealing device being respectively provided with a plurality of nozzles on outer walls facing the nitrogen sealing seat, the oxygen lance, the converter, and the second nitrogen sealing device, the second nitrogen sealing device being also respectively provided with a plurality of nozzles on outer walls facing the nitrogen sealing seat, the oxygen lance, the converter, and the first nitrogen sealing device, the nozzles in the present invention are arranged in such a manner that nitrogen can sweep through most of the area between the first nitrogen sealing device, the second nitrogen sealing device, and the nitrogen sealing seat, thereby improving the nitrogen sealing effect, and the first nitrogen sealing device and the second nitrogen sealing device can enter and exit the nitrogen sealing seat through the lifting and transverse movement device, and during this process, there is no need to lift out the oxygen lance, which can greatly improve the maintenance convenience of the first nitrogen sealing device and the second nitrogen sealing device.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen lance nitrogen sealing of steelmaking converters, and in particular to a device for improving the nitrogen sealing effect of an oxygen lance and a use method thereof. Background Art

[0002] The oxygen top-blown converter steelmaking method uses an oxygen lance to blow high-pressure oxygen into the furnace from the top of the converter to enhance the steelmaking process and improve the stirring of the molten pool. It is a converter steelmaking process that is widely used today. The oxygen top-bottom combined blown converter will produce a large amount of iron oxide dust and high-concentration carbon monoxide gas during the steelmaking process. These smoke and gases will overflow from the oxygen lance holes on the floor. Carbon monoxide gas is flammable and explosive and is very dangerous, while iron oxide dust will cause serious air pollution and must be recycled and comprehensively utilized to prevent environmental pollution. At the same time, during the blowing period, the upward flame of the converter can easily burn the oxygen tube of the oxygen lance and cause an explosion, posing a huge safety hazard.

[0003] In order to solve the above problems, the existing technology usually adds an oxygen lance nitrogen sealing device at the oxygen lance hole. When the oxygen lance is inserted into the converter for blowing, the oxygen lance nitrogen sealing device surrounding the oxygen lance will continuously spray nitrogen, which creates pressure on the flue gas and dust generated during converter steelmaking, preventing them from leaking from the oxygen lance hole. The nitrogen is then drawn away by the dust removal fan through the converter flue system, preventing the flue gas from overflowing.

[0004] The current oxygen lance nitrogen sealing device usually consists of a nitrogen sealing seat and a nitrogen sealing plug. Nitrogen enters through the nitrogen sealing seat, passes through the gap channel between the nitrogen sealing seat and the nitrogen sealing plug, and then supplies nitrogen into the gap between the nitrogen sealing plug and the oxygen lance to form a nitrogen seal. However, after long-term blowing, a large amount of iron oxide dust particles repeatedly rise up, eventually causing some nozzles to be blocked, resulting in a low nitrogen flow rate at the nitrogen sealing seat and poor nitrogen sealing effect. In severe cases, it will cause the overflow of flue gas and dust from the converter and the upward rise of flames, which not only pollutes the environment but also poses a safety hazard.

[0005] In order to ensure the nitrogen sealing effect, the nitrogen sealing seat and the nitrogen sealing plug must be cleaned regularly, and the clogged nozzles must be replaced or cleaned. However, in order to clean the nitrogen sealing seat, the production of the converter must be suspended and the oxygen lance must be lifted out using a lifting trolley so that the nitrogen sealing plug can be lifted up by a crane. Therefore, in order to ensure production efficiency, the maintenance cycle of the nitrogen sealing seat and the nitrogen sealing plug must be extended. The nitrogen sealing seat and the nitrogen sealing plug are only maintained when the converter lining is replaced at the end of its service life. As a result, the nitrogen sealing effect often deteriorates significantly in the middle and late stages of the converter service life, and the oxygen lance nitrogen sealing device has a shortened service life due to the excessively long maintenance cycle. Summary of the Invention

[0006] The purpose of the present invention is to provide a device and a method for using the device to improve the nitrogen sealing effect of the oxygen lance in order to solve the problems existing in the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A device for improving the nitrogen sealing effect of an oxygen lance comprises a floor located above a converter, wherein a lifting and transverse movement device and a nitrogen sealing seat are provided on the floor, wherein the nitrogen sealing seat is embedded in the floor, wherein a first nitrogen sealing device and a second nitrogen sealing device are provided in the nitrogen sealing seat, wherein the lifting and transverse movement device comprises a transverse slide rail and a lifting slide rail, wherein the lifting slide rails are arranged in pairs, wherein the lifting slide rails are slidably connected to the transverse slide rails, wherein each of the lifting slide rails is provided with a lifting slider, wherein the lifting slider is slidably connected to the lifting slide rails, wherein the first nitrogen sealing device and the second nitrogen sealing device are respectively connected to different lifting sliders, wherein a gap is left between the first nitrogen sealing device and the second nitrogen sealing device for the oxygen lance to pass through, wherein the first nitrogen sealing device is respectively provided with a plurality of nozzles on outer walls facing the nitrogen sealing seat, the oxygen lance, the converter and the second nitrogen sealing device, and wherein the second nitrogen sealing device is also respectively provided with a plurality of nozzles on outer walls facing the nitrogen sealing seat, the oxygen lance, the converter and the first nitrogen sealing device.

[0009] The present invention replaces the nitrogen sealing plug with the first nitrogen sealing device and the second nitrogen sealing device, and allows nitrogen to directly enter the nitrogen sealing seat through the nozzles of the first nitrogen sealing device and the second nitrogen sealing device. The arrangement of the nozzles enables nitrogen to sweep most of the area between the first nitrogen sealing device, the second nitrogen sealing device and the nitrogen sealing seat, thereby improving the nitrogen sealing effect and thus improving the stability of the converter during blowing.

[0010] Preferably, the lifting and transverse movement device also includes a steel structure frame, the steel structure frame is fixed on the floor, the transverse movement rails are arranged in pairs, and the transverse movement rails are symmetrically fixed on the top and bottom sides of the steel structure frame, and the lifting rails are located between the transverse movement rails.

[0011] Preferably, a transverse cylinder is provided on both sides of the steel structure frame, the movement direction of the transverse cylinder piston is parallel to the length direction of the transverse slide rail, the lifting slide rail is located between the transverse cylinders, and the pistons of the transverse cylinders are respectively connected to the lifting slide rails.

[0012] The transverse cylinder is used to drive the lifting slide to move along the transverse slide, so that the first nitrogen sealing device and the second nitrogen sealing device can move laterally along the length direction of the transverse slide. The movement range of the lifting slide is limited by adjusting the piston stroke of the transverse cylinder, thereby avoiding collision between the first nitrogen sealing device and the second nitrogen sealing device.

[0013] Preferably, a rack is provided on the lifting rail, and the rack is arranged along the length direction of the lifting rail. A climbing motor is provided on the lifting slider, and the climbing motor is connected to the rack through a gear.

[0014] After the climbing motor is started, it can rotate the gear, so that the gear brings the lifting slider to move up and down along the rack, thereby enabling the lifting slider to move up and down along the lifting slide rail.

[0015] Preferably, the lifting slider is connected to the top of the first nitrogen sealing device or the top of the second nitrogen sealing device through a connecting rod.

[0016] Preferably, the nitrogen sealing seat is cylindrical, the top of the nitrogen sealing seat is not higher than the floor, and the lifting and transverse movement device is located above the nitrogen sealing seat.

[0017] Preferably, the cross-sections of the first nitrogen sealing device and the second nitrogen sealing device are both semicircular, the first nitrogen sealing device and the second nitrogen sealing device are symmetrically arranged relative to the central axis of the nitrogen sealing seat, and the tops of the first nitrogen sealing device and the second nitrogen sealing device are both provided with air inlets, and the air inlets are connected to the nitrogen pipeline through a metal hose.

[0018] Preferably, an air cavity is provided inside the first nitrogen sealing device and the second nitrogen sealing device, the nozzle is connected to the metal hose through the air cavity, and adjacent nozzles are arranged at intervals.

[0019] The shapes of the first nitrogen sealing device and the second nitrogen sealing device enable them to be arranged around the oxygen lance. Nitrogen enters the air cavities of the first nitrogen sealing device and the second nitrogen sealing device through the nitrogen pipeline and the air inlets of the first nitrogen sealing device and the second nitrogen sealing device, and is finally ejected from each of the nozzles.

[0020] Preferably, a method for using a device for improving the nitrogen sealing effect of an oxygen lance is as follows:

[0021] S1. When the converter is operating normally, nitrogen is ejected from the nozzles of the first nitrogen sealing device and the second nitrogen sealing device;

[0022] S2. During routine maintenance of the converter, first, controlling the lifting slide block to move along the lifting rail to separate the first nitrogen sealing device and the second nitrogen sealing device from the nitrogen sealing seat; and secondly controlling the lifting rail to move away from each other along the transverse rail to separate the first nitrogen sealing device and the second nitrogen sealing device from each other;

[0023] S3, checking and cleaning the nozzles of the first nitrogen sealing device and the second nitrogen sealing device;

[0024] S4. Control the lifting slide rails to move closer to each other along the transverse slide rails, so that the first nitrogen sealing device and the second nitrogen sealing device are moved to the side of the oxygen lance, and then control the lifting sliders to move along the lifting slide rails to return the first nitrogen sealing device and the second nitrogen sealing device to the nitrogen sealing seat.

[0025] The first nitrogen sealing device and the second nitrogen sealing device of the present invention can enter and exit the nitrogen sealing seat through the lifting and transverse movement device, and during this process, the first nitrogen sealing device and the second nitrogen sealing device do not interfere with the oxygen lance, and there is no need to lift out the oxygen lance, which enables the first nitrogen sealing device and the second nitrogen sealing device to be maintained synchronously during the routine maintenance of the converter, greatly shortening the maintenance cycle of the oxygen lance nitrogen sealing device, increasing the service life of the oxygen lance nitrogen sealing device, and reducing the overall production cost.

[0026] Since the first nitrogen sealing device and the second nitrogen sealing device of the present invention can be maintained synchronously during the routine maintenance of the converter, the nitrogen sealing effect of the oxygen lance nitrogen sealing device can always be maintained at a normal level, avoiding the overflow of flue gas and dust after the nitrogen sealing effect deteriorates. At the same time, it also avoids the flame of the converter from rising and burning the oxygen lance after the nitrogen sealing effect deteriorates, and can increase the service life of the oxygen lance metal hose from 5 to 6 months to more than 1 year, thereby greatly reducing the cost.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] (1) The present invention replaces the nitrogen sealing plug with the first nitrogen sealing device and the second nitrogen sealing device, and allows nitrogen to directly enter the nitrogen sealing seat through the nozzles of the first nitrogen sealing device and the second nitrogen sealing device. The arrangement of the nozzles enables the nitrogen to sweep through most of the area between the first nitrogen sealing device, the second nitrogen sealing device and the nitrogen sealing seat, thereby improving the nitrogen sealing effect and thus improving the stability during converter blowing.

[0029] (2) The first nitrogen sealing device and the second nitrogen sealing device of the present invention can enter and exit the nitrogen sealing seat through the lifting and transverse movement device, and during this process, the first nitrogen sealing device and the second nitrogen sealing device do not interfere with each other and the oxygen lance does not need to be lifted out. This enables the first nitrogen sealing device and the second nitrogen sealing device to be maintained synchronously during the routine maintenance of the converter, greatly shortening the maintenance cycle of the oxygen lance nitrogen sealing device, increasing the service life of the oxygen lance nitrogen sealing device, and reducing the overall production cost.

[0030] (3) Since the first nitrogen sealing device and the second nitrogen sealing device of the present invention can be maintained simultaneously during the routine maintenance of the converter, the nitrogen sealing effect of the oxygen lance nitrogen sealing device can always be maintained at a normal level, thereby avoiding the overflow of flue gas and dust after the nitrogen sealing effect deteriorates, and also avoiding the flame of the converter from rising and burning the oxygen lance after the nitrogen sealing effect deteriorates. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A three-dimensional diagram of the structure during maintenance of the present invention;

[0032] Figure 2 It is a front view of the structure during maintenance of the present invention;

[0033] Figure 3 for Figure 1 A partial enlarged view of point A in the middle;

[0034] Figure 4 This is a three-dimensional diagram of the structure of the present invention during normal operation;

[0035] Figure 5 Schematic diagram of the positional relationship between the present invention and the converter;

[0036] Figure 6 Schematic diagram of the structure of the semicircular ring bottom plate in the first nitrogen sealing device;

[0037] In the figure: 1. Floor; 2. Nitrogen sealing seat; 3. Lifting and traversing device; 4. Oxygen gun; 5. First nitrogen sealing device; 6. Second nitrogen sealing device; 7. Traversing slide rail; 8. Lifting slide rail; 801, rack; 9. Steel structure frame; 10. Traversing cylinder; 11. Lifting slide block; 1101, climbing motor; 12. Connecting rod; 13. Nozzle; 14. Converter. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0040] like Figures 1 to 6 As shown, the specific scheme of the embodiment is as follows: the specifications of the existing steelmaking converter 14 are usually not less than 50t, and the converter 14 is usually arranged between the first and second floors of the workshop. The present invention is placed on the third floor 1 of the workshop.

[0041] A device for improving the nitrogen sealing effect of an oxygen lance includes a floor 1 located above a converter 14. The floor 1 is provided with a lifting and traversing device 3 and a nitrogen sealing seat 2. The nitrogen sealing seat 2 is embedded in the floor 1 and is cylindrical. The top of the nitrogen sealing seat 2 does not exceed the height of the floor 1. The lifting and traversing device 3 is located above the nitrogen sealing seat 2. A lifting trolley for an oxygen lance 4 is arranged above the lifting and traversing device 3. A first nitrogen sealing device 5 and a second nitrogen sealing device 6 are provided in the nitrogen sealing seat 2. A gap is left between the first nitrogen sealing device 5 and the second nitrogen sealing device 6 for the oxygen lance 4 to pass through. The oxygen lance 4 passes through between the first nitrogen sealing device 5 and the second nitrogen sealing device 6 and enters the converter 14.

[0042] The lifting and transverse movement device 3 includes a pair of transverse slide rails 7, a pair of lifting slide rails 8 and a steel structure frame 9. The steel structure frame 9 is fixed on the floor 1. The steel structure frame 9 includes a rectangular support frame and a support rod. The two cross-arranged support rods are respectively connected to the four end points of the rectangular support frame. The transverse slide rail 7 is symmetrically fixed on the top and bottom sides of the steel structure frame 9 relative to the central axis of the rectangular support frame. The cross section of the transverse slide rail 7 is C-shaped. A slide groove for the movement of the lifting slide rail 8 is provided in the middle of the transverse slide rail 7. The lifting slide rail 8 is located between the transverse slide rails 7. The lifting slide rail 8 is slidably connected to the transverse slide rail 7 through the slide groove of the transverse slide rail 7.

[0043] A transverse cylinder 10 is provided on both sides of the steel structure frame 9. The movement direction of the piston of the transverse cylinder 10 is parallel to the length direction of the transverse slide 7. The piston of the transverse cylinder 10 is connected to the lifting slide 8 respectively. The transverse cylinder 10 is used to drive the lifting slide 8 to move along the transverse slide 7, so that the first nitrogen sealing device 5 and the second nitrogen sealing device 6 can move laterally along the length direction of the transverse slide 7. The movement range of the lifting slide 8 is limited by adjusting the piston stroke of the transverse cylinder 10, thereby avoiding collision between the first nitrogen sealing device 5 and the second nitrogen sealing device 6.

[0044] The lifting slide rail 8 is a hollow rectangular tube with a through groove. The through groove is opened on the front of the rectangular tube, and the length of the through groove is the same as that of the rectangular tube. Each lifting slide rail 8 is provided with a lifting slider 11. The lifting slider 11 includes a top plate, a bottom plate and a connecting plate. The cross section of the lifting slider 11 is I-shaped. The top plate and the bottom plate are fixed together by a connecting plate. The bottom plate is located in the rectangular tube. The connecting plate passes through the through groove and connects to the top plate. The lifting slider 11 is slidably connected to the lifting slide rail 8. The lifting slider 11 is connected to the top of the first nitrogen sealing device 5 or the top of the second nitrogen sealing device 6 through a connecting rod 12.

[0045] A lug plate is provided on the top of the first nitrogen sealing device 5 or the top of the second nitrogen sealing device 6 . The connecting rod 12 is L-shaped and is connected to the first nitrogen sealing device 5 or the second nitrogen sealing device 6 through the lug plate.

[0046] The lifting rails 8 are each provided with a rack 801, which is arranged along the length direction of the lifting rails 8. The racks 801 of the two lifting rails 8 are arranged opposite to each other. The lifting slider 11 is provided with a climbing motor 1101, which is arranged on one side of the top plate. The output shaft of the climbing motor 1101 is connected to the gear, and the climbing motor 1101 is connected to the rack 801 through the gear. After the climbing motor 1101 is started, it can rotate the gear, so that the gear drives the lifting slider 11 to move up and down along the rack 801, thereby enabling the lifting slider 11 to move up and down along the lifting rail 8.

[0047] The cross-sections of the first nitrogen sealing device 5 and the second nitrogen sealing device 6 are both semicircular. The first nitrogen sealing device 5 and the second nitrogen sealing device 6 are symmetrically arranged relative to the central axis of the nitrogen sealing seat 2. The tops of the first nitrogen sealing device 5 and the second nitrogen sealing device 6 are both provided with air inlets, which are connected to the nitrogen pipeline through metal hoses. The first nitrogen sealing device 5 and the second nitrogen sealing device 6 are provided with nozzles 13 on the semicircular bottom plates facing the converter 14. The nozzles 13 on the semicircular bottom plates are arranged in a row.

[0048] The first nitrogen sealing device 5 is respectively provided with a plurality of nozzles 13 on the side walls facing the nitrogen sealing seat 2, the oxygen lance 4, and the second nitrogen sealing device 6. The nozzles 13 on the side walls of the first nitrogen sealing device 5 are arranged in a row from top to bottom surrounding the first nitrogen sealing device 5. The second nitrogen sealing device 6 is also respectively provided with a plurality of nozzles 13 on the side walls facing the nitrogen sealing seat 2, the oxygen lance 4, and the first nitrogen sealing device 5. The nozzles 13 on the side walls of the second nitrogen sealing device 6 are arranged in a row from top to bottom surrounding the second nitrogen sealing device 6, and adjacent nozzles 13 are arranged at intervals.

[0049] An air cavity is provided inside the first nitrogen sealing device 5 and the second nitrogen sealing device 6 , and the nozzle 13 is connected to the metal hose through the air cavity.

[0050] The shapes of the first nitrogen sealing device 5 and the second nitrogen sealing device 6 enable them to be arranged around the oxygen lance 4. Nitrogen enters the air cavities of the first nitrogen sealing device 5 and the second nitrogen sealing device 6 through the nitrogen pipeline and the air inlets of the first nitrogen sealing device 5 and the second nitrogen sealing device 6, and is finally ejected from each nozzle 13.

[0051] A method for using a device for improving the nitrogen sealing effect of an oxygen lance is as follows:

[0052] (1) When the converter 14 is operating normally, the first nitrogen sealing device 5 and the second nitrogen sealing device 6 are located in the nitrogen sealing seat 2, and nitrogen is ejected from the nozzles 13 of the first nitrogen sealing device 5 and the second nitrogen sealing device 6 to form a stable nitrogen seal;

[0053] (2) During routine maintenance of the converter 14, first start the climbing motor 1101 to move the lifting slide 11 upward along the lifting slide rail 8 until the first nitrogen sealing device 5 and the second nitrogen sealing device 6 are completely separated from the nitrogen sealing seat 2 and move above the floor 1, and then start the transverse cylinder 10 to move the two lifting slide rails 8 away from each other along the transverse slide rail 7, so that the first nitrogen sealing device 5 and the second nitrogen sealing device 6 are away from each other until the piston of the transverse cylinder 10 retracts to the minimum limit;

[0054] (3) Check and clean the nozzles 13 of the first nitrogen sealing device 5 and the second nitrogen sealing device 6, and replace damaged nozzles 13;

[0055] (4) Start the traverse cylinder 10 again to control the lifting slide 8 to move closer to each other along the traverse slide 7, so that the first nitrogen sealing device 5 and the second nitrogen sealing device 6 are close to the oxygen lance 4 again, until the piston of the traverse cylinder 10 is extended to the maximum limit. At this time, the first nitrogen sealing device 5 and the second nitrogen sealing device 6 arrive beside the oxygen lance 4, and then start the climbing motor 1101 to move the lifting slider 11 downward along the lifting slide 8 until the first nitrogen sealing device 5 and the second nitrogen sealing device 6 return to the nitrogen sealing seat 2;

[0056] (5) When the converter 14 is ready to start working, nitrogen is refilled into the first nitrogen sealing device 5 and the second nitrogen sealing device 6.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for improving the nitrogen sealing effect of an oxygen lance, comprising a floor located above a converter, characterized in that: A lifting and transverse movement device and a nitrogen sealing seat are provided on the floor, and the nitrogen sealing seat is embedded in the floor. A first nitrogen sealing device and a second nitrogen sealing device are provided in the nitrogen sealing seat. The lifting and transverse movement device includes a transverse slide rail and a lifting slide rail. The lifting slide rails are arranged in pairs, and the lifting slide rails are slidably connected to the transverse slide rails. Each of the lifting slide rails is provided with a lifting slider, and the lifting slider is slidably connected to the lifting slide rail. The first nitrogen sealing device and the second nitrogen sealing device are respectively connected to different lifting sliders. A gap is left between the first nitrogen sealing device and the second nitrogen sealing device for the oxygen gun to pass through. The first nitrogen sealing device is respectively provided with a plurality of nozzles on the outer walls facing the nitrogen sealing seat, the oxygen gun, the converter and the second nitrogen sealing device. The second nitrogen sealing device is also respectively provided with a plurality of nozzles on the outer walls facing the nitrogen sealing seat, the oxygen gun, the converter and the first nitrogen sealing device.

2. The device for improving the nitrogen sealing effect of an oxygen lance according to claim 1, characterized in that: The lifting and transverse movement device also includes a steel structure frame, which is fixed on the floor. The transverse movement rails are arranged in pairs, and the transverse movement rails are symmetrically fixed on the top and bottom sides of the steel structure frame. The lifting rails are located between the transverse movement rails.

3. The device for improving the nitrogen sealing effect of an oxygen lance according to claim 2, characterized in that: A transverse cylinder is provided on both sides of the steel structure frame. The movement direction of the transverse cylinder piston is parallel to the length direction of the transverse slide rail. The lifting slide rail is located between the transverse cylinders. The pistons of the transverse cylinders are respectively connected to the lifting slide rails.

4. The device for improving nitrogen sealing effect of an oxygen lance according to claim 1, characterized in that: The lifting rail is provided with a rack, and the rack is arranged along the length direction of the lifting rail. The lifting slider is provided with a climbing motor, and the climbing motor is connected to the rack through a gear.

5. The device for improving the nitrogen sealing effect of an oxygen lance according to claim 1, characterized in that: The lifting slide block is connected to the top of the first nitrogen sealing device or the top of the second nitrogen sealing device through a connecting rod.

6. The device for improving nitrogen sealing effect of an oxygen lance according to claim 1, characterized in that: The nitrogen sealing seat is cylindrical, the top of the nitrogen sealing seat is not higher than the floor, and the lifting and transverse movement device is located above the nitrogen sealing seat.

7. The device for improving nitrogen sealing effect of an oxygen lance according to claim 1, characterized in that: The cross-sections of the first nitrogen sealing device and the second nitrogen sealing device are both semicircular, and the first nitrogen sealing device and the second nitrogen sealing device are symmetrically arranged relative to the central axis of the nitrogen sealing seat. The tops of the first nitrogen sealing device and the second nitrogen sealing device are both provided with air inlets, and the air inlets are connected to the nitrogen pipeline through a metal hose.

8. The device for improving nitrogen sealing effect of an oxygen lance according to claim 7, characterized in that: An air cavity is provided inside the first nitrogen sealing device and the second nitrogen sealing device. The nozzle is connected to the metal hose through the air cavity, and adjacent nozzles are arranged at intervals.

9. A method for using the device for improving nitrogen sealing effect of an oxygen lance according to any one of claims 1 to 8, characterized in that: S1. When the converter is operating normally, nitrogen is ejected from the nozzles of the first nitrogen sealing device and the second nitrogen sealing device; S2. During routine maintenance of the converter, first, controlling the lifting slide block to move along the lifting rail to separate the first nitrogen sealing device and the second nitrogen sealing device from the nitrogen sealing seat; and secondly controlling the lifting rail to move away from each other along the transverse rail to separate the first nitrogen sealing device and the second nitrogen sealing device from each other; S3, checking and cleaning the nozzles of the first nitrogen sealing device and the second nitrogen sealing device; S4. Control the lifting slide rails to move closer to each other along the transverse slide rails, so that the first nitrogen sealing device and the second nitrogen sealing device are moved to the side of the oxygen lance, and then control the lifting sliders to move along the lifting slide rails to return the first nitrogen sealing device and the second nitrogen sealing device to the nitrogen sealing seat.

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