Converter oxygen lance opening sealing device stable in sealing

Abstract

A converter oxygen lance opening sealing device stable in sealing is fixedly arranged at a converter smoke hood oxygen lance opening and comprises a sealing cover, an installation hole equal to an oxygen lance in shaft diameter is formed in the center of the sealing cover, and the sealing cover is movably connected to the oxygen lance in a sleeved mode through the installation hole; the sealing seat is provided with a sealing cylinder and an air chamber, the sealing cover abuts against the top of the sealing cylinder, the axis of the sealing cover 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 is stable in sealing performance, and the sealing performance cannot be lowered due to deformation and swinging of an oxygen lance.

Description

Technical Field

[0001] The utility model 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 chemical reactions between the components of the molten iron to generate heat 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 when it leaves the converter smoke hood oxygen lance mouth, causing environmental pollution and energy waste.

[0004] In order to prevent 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 consists of an inverted conical sealing plug sleeved on the oxygen lance and a sealing seat fixed to the top of the oxygen lance mouth. The sealing plug and the sealing seat both have air chambers surrounding the oxygen lance. The sealing seat is connected to a nitrogen or steam gas source. During the converter blowing process, the sealing plug rises and falls with the oxygen lance and cooperates with the sealing seat. The gas source is ejected from the annular through hole in the sealing seat to the oxygen lance to form an air curtain, which seals against 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 prone to deformation. In addition, the oxygen lance will swing during use. The deformation and swing of the oxygen lance will cause the inverted conical sealing plug and the conical surface of the sealing seat to be assembled in a misaligned position, 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 to address the above technical problems, which has stable sealing performance and will not be reduced due to deformation and swing of the oxygen lance.

[0007] The utility model 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. A mounting hole equal to the diameter of the oxygen lance is provided in the center of the sealing cover. 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. The sealing seat is provided with a sealing cylinder and an air chamber. The sealing cover abuts against the top of the sealing cylinder. The axis of the sealing cover coincides with the axis of the sealing cylinder. The air chamber is a hollow annular cylinder. 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 a whole.

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

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

[0012] The connecting wall surface of the air chamber and the sealing cylinder is evenly distributed with a plurality of air holes which can connect the air chamber and the sealing cylinder and have air outlet directions downward.

[0013] In one embodiment, the included 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 air holes is greater than or equal to 100.

[0018] In one embodiment, a fixed disk is provided. The fixed disk is annular and is sleeved on the outside 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 lance mouth of the converter with stable sealing is provided with a flat assembly between the sealing cover and the sealing seat. When the oxygen lance moves downward, the sealing cover can maintain contact with the top of the sealing barrel, thereby maintaining the oxygen lance mouth of the converter smoke hood, and the sealing effect will not be changed due to deformation or swinging of the oxygen lance. In addition, during the ascent of the oxygen lance, the sealing cover moves upward with the oxygen lance under the action of the limit plate, and the air intake is ejected downward from the air hole to form an air curtain, which can continue to seal the oxygen lance mouth of the converter smoke hood. The sealing device for the oxygen lance mouth of the 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 the converter oxygen lance mouth sealing device of the prior art;

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

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

[0023] Figure 4 Schematic diagram of the structure of the pore;

[0024] Figure 5 This 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 this utility model, “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 operate in a specific orientation. Therefore, it 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 includes:

[0029] The sealing cover 100 is in the shape of a circular plate. A mounting hole having the same diameter as the lance 200 is provided in the center of the sealing cover 100. 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 sealing cover 100 abuts against the top of the sealing cylinder 310, and the axis of the sealing cover 100 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 connected as one piece.

[0031] In this embodiment, the sealing cover 100 and the sealing cylinder 310 are installed in a planar manner. The assembly of the sealing cover 100 and the sealing cylinder 310 will not be affected by 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 cap 100 is 1:1.2-2, and the thickness of the sealing cap 100 is 30mm-50mm. This provides a large sealing surface for the sealing cap 100 against the sealing cylinder 310. Furthermore, the sealing cap 100 is thicker and heavier, making it less likely to move under the force of the oxygen lance 200 swinging. It maintains a tight fit with the mounting hole of the sealing cap 100, without compromising sealing performance.

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

[0034] Specifically, in this embodiment, there are three limit plates 330, all located on the same circle, with the distance between two adjacent limit plates 330 being equal. The limit plates 330 essentially serve as a positioning mechanism, increasing the clearance for the oxygen lance 200 head to be removed when the oxygen lance 200 is moved upward.

[0035] An air inlet pipe 340 is provided 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 of the air chamber 320 and the sealing cylinder 310 to connect the air chamber 320 and the sealing cylinder 310 and to discharge air 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 included angle α between the axis of each air hole 350 and the connecting wall of the air chamber 320 and the sealing cylinder 310 is 130°≤α≤140°. The diameter of the air hole 350 is 3 mm to 5 mm. In this embodiment, the smaller the diameter of the air hole 350, the greater the pressure of the gas discharged from the air chamber 320 through the air hole 350, resulting in a more stable high-pressure air curtain.

[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 the same circle with a diameter equal to the axial diameter of the sealing tube 310. 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 further 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, as the oxygen lance 200 ascends, the sealing cover 100, under the action of the limiting plate 330, moves upward with the oxygen lance 200. Air from the air inlet is ejected downward from the air hole 350, forming an air curtain that continues to seal the oxygen lance port of the converter hood. The present invention provides a stable sealing device for the converter oxygen lance port, ensuring a stable seal that is unaffected by ambient temperature and humidity.

[0045] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended 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), the sealing cover (100) is in the shape of a circular plate, a mounting hole having the same diameter as the axis 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 is fixedly assembled with the bottom of the converter smoke hood oxygen gun port, the sealing seat is provided with a sealing cylinder (310) and an air chamber (320), the sealing cover (100) is in contact with the top of the sealing cylinder (310), the axis of the sealing cover (100) 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) and the sealing cylinder (310) are connected as one piece; A plurality of limiting plates (330), each limiting plate (330) is fixedly connected to the outer wall surface of the oxygen lance (200), and the plurality of limiting plates (330) are located on the same horizontal plane; An air inlet pipe (340) is provided on the outer side wall of the air chamber (320), and the air inlet pipe (340) is in communication with the air chamber (320); The connecting wall surface between the air chamber (320) and the sealing cylinder (310) is evenly distributed with a plurality of air holes (350) that can connect the air chamber (320) and the sealing cylinder (310) and have an air outlet direction downward.

2. The sealed and stable converter oxygen lance sealing device according to claim 1, characterized in that: The included 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 pores (350) have a diameter of 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 fixed disk (360) is also 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 port of the converter smoke hood through the fixed disk (360).

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