Nitrogen sealing device for spinning oxygen lance

Abstract

This utility model belongs to the field of oxygen lance nitrogen sealing technology, and particularly relates to a spinning-type oxygen lance nitrogen sealing device, including an upper sealing plate, a lower sealing plate, an inner enclosure plate, an outer protective plate, and a nitrogen inlet pipe. The upper and lower sealing plates, the inner enclosure plate, and the outer protective plate are welded to form an annular gas storage chamber. The inner enclosure plate has closely spaced air outlets, and the outer protective plate has a nitrogen inlet pipe. The middle of the inner enclosure plate is the oxygen lance channel. The inner enclosure plate is a spinning-formed folded plate structure, including an upper inclined plate and a lower straight plate. The upper inclined plate has at least one row of air outlet holes, and the lower straight plate has at least four rows of air outlet holes. The outlet of the air outlet holes is located at the bottom of the annular groove on the inner surface of the lower straight plate. The beneficial effects of this utility model are: the spinning-type inner enclosure plate structure and the integral forming by spinning improve the strength of the device at high temperatures; the dual air inlet on the outer protective plate achieves an effective pressure stabilization effect.

Description

Technical Field

[0001] This utility model belongs to the field of oxygen lance nitrogen sealing technology, and particularly relates to a spinning oxygen lance nitrogen sealing device. Background Technology

[0002] The oxygen lance is a crucial piece of equipment in top-blown oxygen steelmaking. Its function is to blow high-pressure, high-purity oxygen at supersonic speeds above the molten metal pool in a converter. It is a tubular device equipped with a high-pressure water cooling protection system. The performance characteristics of the oxygen lance directly affect the smelting effect and blowing time, thus influencing the quality and yield of the steel. The principle of nitrogen sealing in the oxygen lance is to fill the oxygen lance pipes with nitrogen to create a nitrogen environment, thereby reducing the oxygen content and preventing chemical reactions between oxygen and the substances inside the pipes. Specifically, the oxygen lance nitrogen sealing device consists of a nitrogen supply valve, a nitrogen release valve, and a breather valve.

[0003] Chinese invention patent application number 202210002626.0 discloses a nitrogen sealing device and method for a converter oxygen lance, including an oxygen lance, and a nitrogen sealing plug and a nitrogen sealing seat that are fitted onto the oxygen lance; a nitrogen inlet is provided on one side of the nitrogen sealing seat, and a pipe is provided on the nitrogen sealing plug. The pipe is connected to a control system for introducing nitrogen through a gas supply hose, which seals the inside and outside of the nitrogen sealing plug separately, thereby increasing the reliability of the nitrogen sealing device and preventing flue gas from escaping from the inside and outside of the nitrogen sealing plug during the converter smelting process, thus avoiding environmental pollution.

[0004] Chinese utility model patent application number 202123243787.9 discloses an oxygen lance nitrogen sealing method, including a steel pipe and an annular pipe and a cone located outside the steel pipe. The annular pipe and the cone are fixedly connected side by side. The inner wall of the steel pipe is smooth, and multiple through holes are provided on the steel pipe, with the through holes being flat. By making the inner wall of the steel pipe smooth and providing flat through holes, the original grooves and round holes are eliminated, which not only ensures smooth use without clogging, but also greatly reduces the processing difficulty. It should be noted that in order to ensure the stability of the annular pipe and the cone, multiple reinforcing ribs are provided between the annular pipe and the cone. The reinforcing ribs play a role in improving the overall stability. The drawback is that the processing is more complicated.

[0005] Because the gas inside the nitrogen blanketing device needs to maintain a certain pressure, conventional nitrogen blanketing welding structures will deform under the action of temperature and pressure, leading to local cracking and making it impossible to maintain the nitrogen pressure, which will threaten environmental safety. Therefore, improving the structure of the nitrogen blanketing device to make it more stable and have a better nitrogen blanketing effect is an endless pursuit in the industry. Utility Model Content

[0006] The purpose of this invention is to provide a spinning-type oxygen lance nitrogen sealing device that overcomes the shortcomings of the prior art. It adopts a spinning-type inner shroud structure, which includes an upper conical section and a lower straight section. The inner shroud, together with the upper sealing plate, the outer protective plate, and the lower sealing plate, forms an annular gas storage chamber structure. The densely distributed holes on the inner shroud can play a role in pressurization, thereby achieving a better nitrogen sealing effect.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A spinning-type oxygen lance nitrogen sealing device includes an upper sealing plate, a lower sealing plate, an inner shroud plate, an outer protective plate, and a nitrogen inlet pipe. The upper and lower sealing plates, the inner shroud plate, and the outer protective plate are welded together to form an annular gas storage chamber. The inner shroud plate has closely spaced air outlets, and the outer protective plate has a nitrogen inlet pipe. The middle of the inner shroud plate is the oxygen lance channel. The inner shroud plate is a spinning-formed folded plate structure, including an upper inclined plate and a lower straight plate. The upper inclined plate has at least one row of air outlet holes, and the lower straight plate has at least four rows of air outlet holes. The angle α of the folded plate is 125-140°. The angle β between the axis of the first air outlet hole and the upper sealing plate is 10-15°, and the angle γ between the axis of the second air outlet hole and the upper sealing plate is 18-25°. The outlet of the second air outlet hole is located at the bottom of the annular groove on the inner surface of the lower straight plate.

[0009] Furthermore, two nitrogen inlet pipes are symmetrically arranged on the left and right sides of the outer protective plate, forming a dual-airway air intake structure.

[0010] Furthermore, the thickness of the inner cladding is 18-24 mm.

[0011] Furthermore, the diameter of the first air passage is 4.0-5.0 mm, with 70-85 evenly distributed around the circumference; the diameter of the second air passage is 6.0-7.0 mm, with 65-80 evenly distributed around the circumference.

[0012] Furthermore, the width of the annular groove is 20-25 mm, and the depth is 5-7 mm.

[0013] Furthermore, the end of the nitrogen inlet pipe is provided with a flange.

[0014] Furthermore, the outer edge of the lower sealing plate is provided with a ring of mounting holes for connecting the device to a corresponding fixing object.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1) The inner enclosure is spun and consists of an upper conical section and a lower straight section. The inner enclosure, together with the upper sealing plate, the outer protective plate and the lower sealing plate, forms an annular gas storage chamber structure. It is spun and integrally formed to improve the strength of the device at high temperatures. The outer protective plate has dual air intake channels to achieve effective pressure stabilization.

[0017] 2) The ring pipe is equipped with a small-diameter dense distribution of holes. During smelting, the pressure inside the nitrogen sealing ring increases due to high temperature, and the gas outlet achieves a pressurization effect. The angle of the gas holes can effectively prevent slag backflow and realize the curtain-type nitrogen sealing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 Sectional view along line AA;

[0020] Figure 3 This is a schematic diagram of the external three-dimensional structure of an embodiment of this utility model.

[0021] In the diagram: 1-Upper sealing plate, 2-Lower sealing plate, 3-Inner enclosure plate, 4-Outer protective plate, 5-Nitrogen inlet pipe, 6-Annular gas storage chamber, 7-Gas outlet, 8-Upper inclined plate, 9-Lower straight plate, 10-Annular groove, 11-Mounting hole. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0024] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0025] like Figures 1-3This is a schematic diagram of an embodiment of the spun-formed oxygen lance nitrogen sealing device of this utility model, including an upper sealing plate 1, a lower sealing plate 2, an inner circumference plate 3, an outer protective plate 4, and a nitrogen inlet pipe 5. The upper sealing plate 1, the lower sealing plate 2, the inner circumference plate 3, and the outer protective plate 4 are welded together to form an annular gas storage chamber 6. The inner circumference plate 3 has densely arranged air outlet holes 7, and the outer protective plate 4 is provided with a nitrogen inlet pipe 5. The middle of the inner circumference plate 3 is the oxygen lance channel. The inner circumference plate 3 is a spun-formed folded plate structure, including an upper inclined plate 8 and a lower straight plate 9. The upper inclined plate 8 is provided with at least one row of air outlet holes, and the lower straight plate 9 is provided with at least one row of air outlet holes. The second row of four air passages has a baffle angle α of 125-140°, preferably 130°. The angle β between the axis of the first air passage and the upper sealing plate 1 is 10-15°, preferably 15°. The angle γ between the axis of the second air passage and the upper sealing plate 1 is 18-25°, preferably 20°. The outlet of the second air passage is located at the bottom of the annular groove 10 on the inner surface of the lower straight plate. The width of the annular groove 10 is 20-25mm and the depth is 5-7mm. The function of the second air passage is to form a pressurized air curtain, which can effectively intercept the positive pressure high-pressure yellow smoke and gas overflowing from inside and outside the furnace.

[0026] Two nitrogen inlet pipes 5 are symmetrically arranged on the outer protective plate 4, forming a dual-airway air intake structure.

[0027] The thickness of the inner circumference panel 3 is 18-24mm, preferably 20mm.

[0028] The diameter of the first air passage is 4.0-5.0 mm, preferably 4.2 mm, and 70-85 are evenly distributed around the circumference, preferably 80; the diameter of the second air passage is 6.0-7.0 mm, preferably 6.4 mm, and 65-80 are evenly distributed around the circumference, preferably 70.

[0029] The end of the nitrogen inlet pipe is equipped with a flange for connecting to the main nitrogen pipe.

[0030] The outer edge of the lower sealing plate 2 is provided with a ring of mounting holes 11 for connecting the device to the corresponding fixed object, which can ensure that the installation position of the device meets the requirements.

[0031] This invention employs a gas-storage chamber design with dual gas inlets, effectively achieving pressure stabilization and preheating pressurization. The angled design of the vent holes effectively prevents slag backflow. The densely packed small vent holes, under high temperature during smelting, increase the pressure within the nitrogen sealing ring, thus pressurizing the gas exiting the vent holes and further enhancing the nitrogen sealing effect. The inner cladding plate, machined by spinning, is integrally formed, improving structural strength.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spinning-type oxygen lance nitrogen sealing device, comprising an upper sealing plate, a lower sealing plate, an inner shroud plate, an outer protective plate, and a nitrogen inlet pipe, wherein the upper and lower sealing plates, the inner shroud plate, and the outer protective plate are welded together to form an annular gas storage chamber, the inner shroud plate has densely arranged gas outlet holes, the outer protective plate is provided with a nitrogen inlet pipe, and the middle of the inner shroud plate is an oxygen lance passage, characterized in that, The inner cladding plate is a folded plate structure formed by spinning, including an upper inclined plate and a lower straight plate. The upper inclined plate has at least one row of air passage holes one, and the lower straight plate has at least four rows of air passage holes two. The angle α of the folded plate is 125-140°. The angle β between the axis of the first air passage hole and the upper sealing plate is 10-15°, and the angle γ between the axis of the second air passage hole and the upper sealing plate is 18-25°. The outlet of the second air passage hole is located at the bottom of the annular groove on the inner surface of the lower straight plate.

2. The spinning-type oxygen lance nitrogen sealing device according to claim 1, characterized in that, The outer protective plate is symmetrically provided with two nitrogen inlet pipes on the left and right sides, forming a dual-airway air intake structure.

3. The spinning-type oxygen lance nitrogen sealing device according to claim 1, characterized in that, The thickness of the inner cladding is 18-24 mm.

4. The spinning-type oxygen lance nitrogen sealing device according to claim 1, characterized in that, The diameter of the first air passage is 4.0-5.0 mm, with 70-85 evenly distributed around the circumference; the diameter of the second air passage is 6.0-7.0 mm, with 65-80 evenly distributed around the circumference.

5. The spinning-type oxygen lance nitrogen sealing device according to claim 1, characterized in that, The width of the annular groove is 20-25 mm, and the depth is 5-7 mm.

6. The spinning-type oxygen lance nitrogen sealing device according to claim 1, characterized in that, The nitrogen inlet pipe is equipped with a flange at its end.

7. The spinning-type oxygen lance nitrogen sealing device according to claim 1, characterized in that, The outer edge of the lower sealing plate is provided with a ring of mounting holes for connecting the device to the corresponding fixed object.

Images