Converter oxygen lance opening sealing device stable in sealing

Abstract

The invention discloses a converter oxygen lance opening sealing device with stable sealing, which is fixedly arranged at a converter smoke hood oxygen lance opening, and comprises a sealing cover, the center of the sealing cover is provided with a mounting hole with the same shaft diameter as an oxygen lance, and the sealing cover is movably sleeved on the oxygen lance through the mounting hole; the sealing seat is provided with a sealing cylinder and an air chamber, the cover plate abuts against the top of the sealing cylinder, the axis of the cover plate coincides with the axis of the sealing cylinder, the air chamber is in a hollow annular cylinder shape, the sealing cylinder is sleeved with the air chamber, and the air chamber and the sealing cylinder are integrally connected; each limiting plate is fixedly connected to the outer wall face of the oxygen lance, and the multiple limiting plates are located on the same horizontal plane; an air inlet pipe is arranged on the outer side wall of the air chamber and is communicated with the air chamber; and a plurality of air holes which can communicate the air chamber with the sealing cylinder and have downward air outlet directions are uniformly distributed in the connecting wall surface of the air chamber and the sealing cylinder. The converter oxygen lance opening sealing device stable in sealing is stable in sealing performance and cannot be lowered due to deformation and swing of an oxygen lance.

Description

Technical Field

[0001] The invention relates to the technical field of converter steelmaking, in particular to a converter oxygen lance mouth sealing device with stable sealing. Background Art

[0002] Converter steelmaking uses molten iron, scrap steel and ferroalloys as the main raw materials. It does not rely on external energy sources, but relies on the physical heat of the molten iron itself and the heat generated by the chemical reactions between the molten iron components to complete the steelmaking process in the converter.

[0003] During the converter steelmaking process, a large amount of high-temperature flue gas, dust and coal gas will be generated. The converter high-temperature flue gas can easily escape from the oxygen lance mouth when the oxygen lance leaves the converter smoke hood oxygen lance mouth, causing environmental pollution and energy waste.

[0004] In order to prevent the high-temperature flue gas from escaping from the oxygen lance of the converter hood, a sealing device is usually installed at the oxygen lance of the converter hood. Figure 1 As shown, the existing sealing device is formed by a sealing plug in an inverted cone shape sleeved on the oxygen lance and a sealing seat fixed on the top of the oxygen lance mouth. There are air chambers surrounding the oxygen lance in the sealing plug and the sealing seat. The sealing seat is connected to a nitrogen or steam gas source. During the converter blowing process, the sealing plug cooperates with the sealing seat as the oxygen lance rises and falls. The gas source is ejected from the annular through hole in the sealing seat to the oxygen lance to form an air curtain, which plays a sealing role for high-temperature flue gas, dust and coal gas.

[0005] However, since there is circulating water inside the oxygen lance and it is in a high temperature and high humidity environment for a long time, the temperature changes rapidly and the oxygen lance is easily deformed. In addition, the oxygen lance will swing during use. The deformation and swing of the oxygen lance will cause the inverted cone-shaped sealing plug and the conical surface of the sealing seat to be misaligned, resulting in a decrease in the sealing performance of the sealing device. Summary of the invention

[0006] Based on this, it is necessary to provide a converter oxygen lance mouth sealing device with stable sealing in order to solve the above technical problems, and the sealing performance is stable and will not be reduced due to the deformation and swing of the oxygen lance.

[0007] The present invention provides a converter oxygen lance mouth sealing device with stable sealing, which is fixedly arranged at the converter smoke hood oxygen lance mouth, comprising:

[0008] The sealing cover is in the shape of a circular plate, and a mounting hole equal to the axis diameter of the oxygen lance is arranged in the center of the sealing cover, and the sealing cover can be movably sleeved on the oxygen lance through the mounting hole;

[0009] The bottom of the sealing seat is fixedly assembled with the oxygen gun port of the converter smoke cover, and the sealing seat is provided with a sealing cylinder and an air chamber. The cover plate abuts against the top of the sealing cylinder, and the axis of the cover plate coincides with the axis of the sealing cylinder. The air chamber is a hollow annular cylinder, and the inner diameter of the air chamber is equal to the outer diameter of the sealing cylinder. The air chamber is sleeved on the sealing cylinder, and the air chamber and the sealing cylinder are connected as one body.

[0010] A plurality of limit plates, each of which is fixedly connected to the outer wall of the oxygen lance, and the plurality of limit plates are located on the same horizontal plane;

[0011] An air inlet pipe is arranged on the outer wall of the air chamber, and the air inlet pipe is communicated with the air chamber;

[0012] A plurality of air holes which can communicate the air chamber with the sealing cylinder and have air outlet directions downward are evenly distributed on the connecting wall surface of the air chamber and the sealing cylinder.

[0013] In one embodiment, the angle between the axis of each air hole and the connecting wall of the air chamber and the sealing cylinder is α, and 130°≤α≤140°.

[0014] In one embodiment, the diameter of the pores is 3 mm to 5 mm.

[0015] In one embodiment, the ratio of the outer diameter of the sealing cylinder to the outer diameter of the sealing cover is 1:1.2-2.

[0016] In one embodiment, the thickness of the sealing cover is 30 mm to 50 mm.

[0017] In one embodiment, the number of the pores is greater than or equal to 100.

[0018] In one of the embodiments, a fixed disk is provided. The fixed disk is annular and sleeved on the outer side of the gas chamber. The fixed disk is integrally connected to the gas chamber. The sealing seat is fixedly connected to the oxygen gun port of the converter smoke hood through the fixed disk.

[0019] The beneficial effects of the present invention are as follows: the sealing device for the oxygen gun mouth of a converter with stable sealing of the present invention has a planar assembly between the sealing cover and the sealing seat, and when the oxygen gun moves downward, the sealing cover can maintain contact with the top of the sealing barrel to maintain the oxygen gun mouth of the converter smoke hood, and the sealing effect will not be changed due to deformation or swing of the oxygen gun. In addition, during the ascent of the oxygen gun, the sealing cover moves upward with the oxygen gun under the action of the limit plate, and the air intake at the air inlet is ejected downward from the air hole to form an air curtain, which can continue to seal the oxygen gun mouth of the converter smoke hood. The sealing device for the oxygen gun mouth of a converter with stable sealing of the present invention has stable sealing performance and is not affected by ambient temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a converter oxygen lance mouth sealing device of the prior art;

[0021] Figure 2 A schematic diagram of the assembly relationship between a converter oxygen lance mouth sealing device with stable sealing provided by an embodiment of the present invention and an oxygen lance;

[0022] Figure 3 for Figure 2 One of the cross-sectional diagrams along the axis of the sealing cylinder;

[0023] Figure 4 is a schematic diagram of the structure of the pore;

[0024] Figure 5 The figure is a schematic diagram of the assembly relationship between the converter oxygen lance mouth sealing device and the oxygen lance, which ensures stable sealing when the oxygen lance moves upward.

[0025] Explanation of reference numerals: 100, sealing cover; 200, oxygen gun; 310, sealing cylinder; 320, air chamber; 330, limiting plate; 340, air inlet pipe; 350, air hole; 360, fixing plate. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] It should be noted that in the description of the present invention, “upper”, “lower”, “top”, “bottom”, orientation or position relationship is based on the attached Figure 1 Regarding the orientation or positional relationship shown, it should be understood that these orientation terms 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, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In one embodiment, Figure 2 and Figure 3 As shown, the sealed and stable converter oxygen lance sealing device of this embodiment is fixedly arranged at the converter smoke hood oxygen lance, and comprises:

[0029] The sealing cover 100 is in the shape of a circular plate, and a mounting hole having the same diameter as the axial diameter of the oxygen lance 200 is provided at the center of the sealing cover 100, and the sealing cover 100 can be movably sleeved on the oxygen lance 200 through the mounting hole. The oxygen lance 200 can slide in the mounting hole.

[0030] The bottom of the sealing seat is fixedly assembled with the oxygen gun mouth of the converter smoke hood, and the sealing seat is provided with a sealing cylinder 310 and an air chamber 320. The cover plate abuts against the top of the sealing cylinder 310, and the axis of the cover plate coincides with the axis of the sealing cylinder 310. The air chamber 320 is a hollow annular cylinder, and the inner diameter of the air chamber 320 is equal to the outer diameter of the sealing cylinder 310. The air chamber 320 is sleeved on the sealing cylinder 310, and the air chamber 320 and the sealing cylinder 310 are integrally connected.

[0031] In this embodiment, the sealing cover 100 and the sealing cylinder 310 are in a planar mounting relationship, and the assembly of the sealing cover 100 and the sealing cylinder 310 will not change due to the deformation and swing of the oxygen lance 200, and the sealing performance is more stable.

[0032] The ratio of the outer diameter of the sealing cylinder 310 to the outer diameter of the sealing cover 100 is 1:1.2-2, and the thickness of the sealing cover 100 is 30mm-50mm. The sealing surface of the sealing cover 100 to the sealing cylinder 310 is large, and the thickness of the sealing cover 100 is large, and its mass is also large. It is not easy to move after the force of the oxygen gun 200 swings, and it can still maintain a close fit with the installation hole of the sealing cover 100, and will not affect the sealing performance.

[0033] There are a plurality of limit plates 330 , each of which is fixedly connected to the outer wall surface of the oxygen lance 200 , and the plurality of limit plates 330 are located in the same horizontal plane.

[0034] Specifically, in this embodiment, there are three limit plates 330, which are located on the same circle, and the distance between two adjacent limit plates 330 is equal. The essential function of the limit plate 330 is to play a positioning role, and when the oxygen lance 200 moves up, the removal space of the oxygen lance 200 head is increased.

[0035] An air inlet pipe 340 is disposed on the outer wall of the air chamber 320 , and the air inlet pipe 340 is in communication with the air chamber 320 . The air inlet pipe 340 is connected to an external air source, and can inject nitrogen or steam into the air chamber 320 .

[0036] like Figure 4 As shown, a plurality of air holes 350 are evenly distributed on the connecting wall surface of the air chamber 320 and the sealing cylinder 310, which can connect the air chamber 320 and the sealing cylinder 310 and have the air outlet direction downward.

[0037] The air outlet direction of the air hole 350 is downward. When the oxygen gun 200 moves upward, the air is discharged downward, which can have a counter-impact force on the high-temperature flue gas, dust and coal gas.

[0038] The angle between the axis of each air hole 350 and the connecting wall of the air chamber 320 and the sealing cylinder 310 is α, 130°≤α≤140°. The aperture of the air hole 350 is 3mm to 5mm. The aperture of the air hole 350 of this embodiment is smaller, and the greater the air pressure of the gas discharged from the air chamber 320 through the air hole 350, the higher the air curtain formed is, and the more stable it is.

[0039] In one embodiment, the number of the air holes 350 is greater than or equal to 100.

[0040] Specifically, in this embodiment, the number of air holes 350 is 280, with 40 in each group. Each group of air holes 350 is located on a circle with a diameter equal to the axial diameter of the sealing tube 310, and the 7 groups of air holes 350 are evenly arranged in the vertical direction of the connecting wall of the air chamber 320 and the sealing tube 310.

[0041] In one embodiment, a fixed disk 360 is provided. The fixed disk 360 is annular and is sleeved on the outside of the air chamber 320. The fixed disk 360 is integrally connected to the air chamber 320. The sealing seat is fixedly connected to the oxygen gun mouth of the converter smoke hood through the fixed disk 360.

[0042] Specifically, a plurality of fixing holes are provided on the fixing plate 360, and the fixing plate 360 ​​is fixedly connected to the oxygen lance of the converter smoke hood through the fixing holes.

[0043] The sealed and stable converter oxygen lance mouth sealing device of this embodiment has a flat assembly between the sealing cover 100 and the sealing seat. When the oxygen lance 200 moves downward, the sealing cover 100 can maintain contact with the top of the sealing barrel to maintain the converter smoke hood oxygen lance mouth, and the sealing effect will not be changed due to deformation or swinging of the oxygen lance 200.

[0044] like Figure 5 As shown, during the rising process of the oxygen lance 200, the sealing cover 100 moves upward with the oxygen lance 200 under the action of the limiting plate 330, and the air intake of the air inlet is ejected downward from the air hole 350 to form an air curtain, which can continue to seal the oxygen lance mouth of the converter hood. The converter oxygen lance mouth sealing device of the present invention has stable sealing performance and is not affected by the ambient temperature and humidity.

[0045] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A converter oxygen lance sealing device with stable sealing, characterized in that: Fixedly installed at the oxygen lance of the converter hood, including: A sealing cover (100), wherein the sealing cover (100) is in the shape of a circular plate, a mounting hole having a diameter equal to that of the oxygen lance (200) is provided at the center of the sealing cover (100), and the sealing cover (100) can be movably sleeved on the oxygen lance (200) through the mounting hole; A sealing seat with a bottom fixedly assembled with the oxygen gun mouth of the converter smoke hood, the sealing seat is provided with a sealing cylinder (310) and an air chamber (320), the cover plate is in contact with the top of the sealing cylinder (310), the axis of the cover plate coincides with the axis of the sealing cylinder (310), the air chamber (320) is a hollow annular cylinder, the inner diameter of the air chamber (320) is equal to the outer diameter of the sealing cylinder (310), the air chamber (320) is sleeved on the sealing cylinder (310), and the air chamber (320) is integrally connected with the sealing cylinder (310); A plurality of limit plates (330), each of the limit plates (330) is fixedly connected to the outer wall surface of the oxygen lance (200), and the plurality of limit plates (330) are located on the same horizontal plane; An air inlet pipe (340) is disposed on the outer side wall of the air chamber (320), and the air inlet pipe (340) is in communication with the air chamber (320); A plurality of air holes (350) are evenly distributed on the connecting wall surface of the air chamber (320) and the sealing cylinder (310), which are capable of connecting the air chamber (320) and the sealing cylinder (310) and have air outlet directions downward.

2. The sealed and stable converter oxygen lance sealing device according to claim 1, characterized in that: The angle between the axis of each air hole (350) and the connecting wall surface of the air chamber (320) and the sealing cylinder (310) is α, and 130°≤α≤140°.

3. The sealed and stable converter oxygen lance sealing device according to claim 2, characterized in that: The diameter of the pores (350) is 3 mm to 5 mm.

4. The sealed and stable converter oxygen lance sealing device according to claim 3, characterized in that: The ratio of the outer diameter of the sealing cylinder (310) to the outer diameter of the sealing cover (100) is 1:1.2-2.

5. The sealed and stable converter oxygen lance sealing device according to claim 4, characterized in that: The sealing cover (100) has a thickness of 30 mm to 50 mm.

6. The sealed and stable converter oxygen lance sealing device according to claim 5, characterized in that: The number of the air holes (350) is greater than or equal to 100.

7. The sealed and stable converter oxygen lance sealing device according to claim 6, characterized in that: A fixing disk (360) is also provided. The fixing disk (360) is annular and is sleeved on the outside of the air chamber (320). The fixing disk (360) is integrally connected to the air chamber (320). The sealing seat is fixedly connected to the oxygen gun port of the converter smoke hood via the fixing disk (360).

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