Sealing device for converter oxygen lance insertion hole

Abstract

A sealing device for a converter oxygen lance insertion hole belongs to the technical field of converter top-blowing equipment and is used for preventing smoke from escaping from the converter smelting top-blowing oxygen lance insertion hole. According to the technical scheme, an insertion hole connecting flange is welded to the periphery of the upper end of an oxygen lance insertion hole, a sealing seat is a circular ring, the circular ring periphery of the sealing seat is connected with the insertion hole connecting flange through bolts, a circular ring inner hole of the sealing seat is conical, and the conical lower end of the circular ring inner hole of the sealing seat is matched with the diameter of the upper end of the oxygen lance insertion hole. The oxygen lance body is sleeved with the sealing plug, the periphery of a circular ring of the sealing plug is conical, the periphery of the sealing plug is connected with an inner hole of the sealing seat in a matched mode, the guide cylinder is a cylinder, the lower end of the guide cylinder is welded to the upper end face of the sealing plug, and the guide cylinder is sleeved with the gas collecting cover which is a cylinder. The lower end of the gas collecting cover is welded to the outer edge of the upper end of the sealing seat. A nitrogen sealing structure is omitted, the oxygen lance insertion hole can be sealed, and smokeless operation is achieved.

Description

Technical Field

[0001] This utility model relates to a sealing device for the insertion hole of the top-blown oxygen lance in converter smelting, belonging to the technical field of converter top-blown equipment. Background Technology

[0002] In converter smelting, top blowing of the oxygen lance is a crucial step. With production development and technological advancements, environmental requirements for converter smelting have become increasingly stringent, including the requirement that the oxygen lance insertion hole must not emit smoke. However, controlling smoke emission from the oxygen lance insertion hole has long been a challenging issue in the industry. Currently, over 90% of enterprises still use traditional nitrogen sealing methods to prevent smoke emission from the oxygen lance insertion hole. However, with traditional nitrogen sealing methods, it is difficult to reconcile environmental protection with energy indicators such as gas calorific value, nitrogen consumption, and primary dust removal power consumption. Under immense environmental pressure, energy indicators such as gas calorific value must be sacrificed to avoid smoke emission from the oxygen lance insertion hole. Therefore, converter smelting has to adopt measures such as increasing the nitrogen sealing pressure and increasing the primary dust removal fan airflow. As a result, energy indicators such as gas calorific value remain at a low level, and even so, smoke emission still occurs frequently, without an effective solution. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a sealing device for the oxygen lance insertion hole of a converter. This sealing device eliminates the nitrogen sealing structure and can effectively seal the oxygen lance insertion hole of the converter, enabling smokeless operation of the oxygen lance insertion hole in the converter smelting, achieving environmental protection rating A, and at the same time significantly reducing the nitrogen content in the gas and correspondingly increasing the calorific value of the gas.

[0004] The technical solution to the above technical problem is:

[0005] A sealing device for the oxygen lance insertion hole of a converter includes an insertion hole connecting flange, a sealing seat, supporting limit blocks, a sealing plug, a guide tube, a sealing cover, a gas collection hood, and a pipe interface. The insertion hole connecting flange is welded to the outer circumference of the upper end of the oxygen lance insertion hole. The sealing seat is an annular ring, and its outer circumference is connected to the insertion hole connecting flange by connecting bolts. The inner hole of the sealing seat's annular ring is conical, and the lower end of the conical inner hole matches the upper diameter of the oxygen lance insertion hole. Four supporting limit blocks are evenly distributed and welded around the oxygen lance body. The sealing plug is an annular ring, and its inner hole matches the outer diameter of the oxygen lance body. The sealing plug is fitted onto the oxygen lance body. The lower end face of the sealing plug's ring is placed on the supporting limiting block. The outer circumference of the sealing plug's ring is conical, and the conical shape of the outer circumference of the sealing plug matches the conical shape of the inner hole of the sealing seat's ring. The outer circumference of the sealing plug and the inner hole of the sealing seat are connected in a fitting manner. The guide tube is a cylindrical body, and the lower end of the guide tube is welded to the upper end face of the sealing plug. The upper end of the guide tube is welded to a sealing cover plate. The gas collection hood is a cylindrical body, and the gas collection hood is fitted over the outside of the guide tube. The lower end of the gas collection hood is welded to the outer edge of the upper end of the sealing seat. The outer edge of the sealing cover plate covers the upper end of the gas collection hood. One side of the gas collection hood is connected to the pipe interface, and the pipe interface is connected to the converter's secondary dust removal pipe.

[0006] The sealing device for the oxygen lance insertion hole of the converter mentioned above has an outwardly protruding flange at the lower end of the outer circumference of the sealing seat, and the outer circumference flange of the sealing seat is connected to the insertion hole connecting flange by connecting bolts.

[0007] The sealing device for the oxygen lance insertion hole of the converter mentioned above has a sealing ring on the upper end face of the sealing plug. The inner diameter of the sealing ring matches the diameter of the oxygen lance body. The sealing ring is fitted onto the oxygen lance body. Multiple round holes are evenly distributed around the circumference of the sealing ring. Multiple high-temperature resistant strong magnets are respectively embedded in the round holes around the circumference of the sealing ring. The lower end face of the sealing ring is tightly attracted and connected to the upper end face of the sealing plug through the high-temperature resistant strong magnets.

[0008] The sealing device for the oxygen lance insertion hole of the converter mentioned above has two baffles welded to the upper and lower parts of the inner body of the guide tube. The baffles have a central hole that matches the oxygen lance body. The central hole of the baffle is fitted around the outer periphery of the oxygen lance body. Multiple air guide holes are evenly distributed on the inner wall of the guide tube and the baffles. The air guide holes are connected to the inner cavity of the gas collection hood outside the guide tube.

[0009] The sealing device for the oxygen lance insertion hole of the converter described above, wherein the cylindrical body of the gas collection hood is composed of an outer sleeve, an inner sleeve, and a ring. The outer sleeve is fitted around the outer circumference of the inner sleeve. The upper and lower ends of the outer sleeve and the inner sleeve are respectively connected to the ring. There are multiple air inlet holes between the upper ring and the upper end of the inner sleeve. The inner side of the inner sleeve is opposite to the outer side of the outer wall of the guide tube. The outer edge of the sealing cover plate above the gas collection hood covers the upper ring. The pipe interface is a sleeve with a rectangular cross section. The pipe interface is placed horizontally. There is an interface connection hole on the outer sleeve wall of the gas collection hood. One end of the pipe interface is welded to the interface connection hole on the outer sleeve wall.

[0010] The beneficial effects of this utility model are:

[0011] The sealing seat and sealing plug of this invention can prevent flue gas from escaping from the oxygen lance insertion hole. The sealing ring is attracted to the sealing plug by a high-temperature resistant strong magnet, and the sealing ring can better seal the gap between the oxygen lance body and the sealing plug. The small amount of leaked gas generated from the gap between the sealing ring and the oxygen lance body is collected by the guide tube and the gas collection hood under the action of the secondary dust removal negative pressure and discharged into the converter secondary dust removal pipeline, so that the oxygen lance insertion hole of the converter smelting can achieve smokeless operation.

[0012] This utility model has a simple structure and is easy to use. It eliminates the nitrogen sealing structure, which can effectively seal the oxygen lance insertion hole in the converter, enabling smokeless operation throughout the smelting process. At the same time, it significantly reduces the nitrogen content in the gas and correspondingly increases the calorific value of the gas. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the usage state of this utility model;

[0015] Figure 3 This is a schematic diagram of the sealing seat structure;

[0016] Figure 4 This is a schematic diagram of the sealing plug;

[0017] Figure 5 This is a schematic diagram of the sealing ring structure;

[0018] Figure 6 This is a schematic diagram of the flow guide tube;

[0019] Figure 7 This is a schematic diagram of the gas collection hood.

[0020] The following are the markings in the diagram: 1. Oxygen lance body; 2. Oxygen lance insertion hole; 3. Insertion hole connecting flange; 4. Connecting bolt; 5. Sealing seat; 6. Support limiting block; 7. Sealing plug; 8. Flow guide tube; 9. Sealing cover plate; 10. Gas collection hood; 11. Pipe interface; 12. Sealing ring; 13. High temperature resistant strong magnet; 14. Partition plate; 15. Gas guide hole; 16. Outer sleeve; 17. Inner sleeve; 18. Circular ring. Detailed Implementation

[0021] This utility model consists of an insertion hole connecting flange 3, connecting bolts 4, sealing seat 5, support limiting block 6, sealing plug 7, flow guide tube 8, sealing cover plate 9, gas collection hood 10, pipe interface 11, sealing ring 12, and high temperature resistant strong magnet 13.

[0022] Figure 1 , 3 The diagram shows that the insertion port connecting flange 3 is welded to the outer periphery of the upper end of the oxygen lance insertion port 2, and is used to connect the sealing seat 5. The sealing seat 5 is an annular ring, and the lower end of the outer periphery of the sealing seat 5 has an outwardly protruding flange. The outer periphery flange of the sealing seat 5 is connected to the insertion port connecting flange 3 by connecting bolts 4. The inner hole of the sealing seat 5 is conical, and the lower end of the conical inner hole of the sealing seat 5 matches the diameter of the upper end of the oxygen lance insertion port 2.

[0023] Figure 1 , 4 The diagram shows that four supporting and limiting blocks 6 are evenly welded around the oxygen lance body 1 to support the sealing plug 7. The sealing plug 7 is an annular ring, with its inner hole matching the outer diameter of the oxygen lance body 1. The sealing plug 7 is fitted onto the oxygen lance body 1, with its lower end face resting on the supporting and limiting blocks 6. A large gap is maintained between the outer wall of the oxygen lance body 1 and the inner hole of the sealing plug 7 to compensate for concentricity deviations between the oxygen lance body 1 and the sealing seat 5. The outer circumference of the sealing plug 7 is conical, matching the conical shape of the inner hole of the sealing seat 5. The outer circumference of the sealing plug 7 and the inner hole of the sealing seat 5 are tightly fitted together, preventing flue gas from escaping from the oxygen lance insertion hole 2.

[0024] Figure 1 , 5The upper surface of the sealing plug 7 has a sealing ring 12. The inner diameter of the sealing ring 12 matches the diameter of the oxygen lance body 1. The sealing ring 12 is fitted onto the oxygen lance body 1, with a small gap between the inner wall of the sealing ring 12 and the outer wall of the oxygen lance body 1, allowing it to slide freely up and down to minimize the amount of flue gas escaping from the gap. Multiple circular holes are evenly distributed around the circumference of the sealing ring 12, and multiple high-temperature resistant strong magnets 13 are embedded in these holes. The lower ends of the high-temperature resistant strong magnets 13 are tightly attracted to the upper surface of the sealing plug 7. The high-temperature resistant strong magnets 13, embedded in the sealing ring 12, give the sealing ring 12 a strong magnetic force to adhere to the sealing plug 7, but it can move freely within a certain range in the horizontal direction.

[0025] Figure 1 , 6 The guide tube 8 is a cylindrical body. The lower end of the guide tube 8 is welded to the upper end face of the sealing plug 7, and the upper end of the guide tube 8 is welded to a sealing cover plate 9. Two baffles 14 are welded to the upper and lower parts of the guide tube 8, respectively. Each baffle 14 has a central hole that matches the oxygen lance body 1. The central hole of the baffle allows it to slide freely up and down around the outer circumference of the oxygen lance body 1. Multiple air guide holes 15 are evenly distributed on the cylinder wall of the guide tube 8 and the baffles 14, and these air guide holes 15 communicate with the inner cavity of the gas collection hood 10 outside the guide tube 8. A small amount of flue gas escaping from the connection between the sealing plug 7 and the oxygen lance body 1 enters the gas collection hood 10 outside the guide tube 9 through the air guide holes 15 for collection and discharge.

[0026] Figure 1 , 7 As shown, the gas collection hood 10 is a cylindrical body, which is fitted over the outside of the guide tube 9. The lower end of the gas collection hood 10 is welded to the upper outer edge of the sealing seat 5. The outer edge of the sealing cover plate 9 covers the upper end of the gas collection hood 10. One side of the gas collection hood 10 is connected to the pipe interface 11, which is connected to the secondary dust removal pipe of the converter.

[0027] Figure 1 , 7 The gas collection hood 10 is shown to have a cylindrical body composed of an outer sleeve 16, an inner sleeve 17, and a ring 18. The outer sleeve 16 is fitted around the outer circumference of the inner sleeve 17. The upper and lower ends of the outer sleeve 16 and the inner sleeve 17 are welded together by the ring 18. There are multiple air inlets between the upper ring 18 and the upper end of the inner sleeve 17. The inner side of the inner sleeve 17 is opposite to the outer side of the outer wall of the guide tube 8. The outer edge of the sealing cover 9 above the gas collection hood 10 covers the upper ring 18. The pipe interface 11 is a rectangular sleeve. The pipe interface 11 is placed horizontally, and there is an interface connection hole on the outer sleeve wall. One end of the pipe interface 11 is welded to the interface connection hole on the outer sleeve wall.

[0028] Figure 2The usage process of this utility model is shown as follows:

[0029] Before the oxygen lance body 1 is inserted into the oxygen lance insertion hole 2, the insertion hole connecting flange 3 is welded to the outer periphery of the upper end of the oxygen lance insertion hole 2. The sealing seat 5 is fixedly connected to the insertion hole connecting flange 3 by the connecting bolt 4. The lower end of the gas collection hood 10 is welded to the outer edge of the upper end of the sealing seat 5. The pipe interface 11 on one side of the gas collection hood 10 is connected to the secondary dust removal pipe of the converter.

[0030] A support limiting block 6 is welded onto the oxygen lance body 1, which is to be inserted into the oxygen lance insertion hole 2. A sealing plug 7 is fitted onto the oxygen lance body 1, with the lower end of the sealing plug 7 placed on the support limiting block 6. A sealing ring 12 is attracted to the sealing plug 7 by a high-temperature resistant strong magnet 13. The lower end of the flow guide tube 8 is welded to the upper end face of the sealing plug 7, and a sealing cover plate 9 is welded to the upper end of the flow guide tube 8.

[0031] The oxygen lance body 1 is inserted downward into the oxygen lance insertion hole 2. The outer periphery of the sealing plug 7 is connected to the inner hole of the sealing seat 5. The conical fit is tight, which can prevent flue gas from escaping from the oxygen lance insertion hole 2. At the same time, the sealing ring 12 can better seal the gap between the oxygen lance body 1 and the sealing plug 7.

[0032] The oxygen lance body 1 continues to descend through the sealing seat 5, which is stationary above the oxygen lance insertion hole 2, to the oxygen-starting point. The oxygen lance then enters the normal smelting state. High-temperature flue gas, coal gas, and other gases are sealed in the inner cavity of the oxygen lance insertion hole 2 by the sealing plug 7 and the sealing ring 12. A small amount of leaked gas generated by the gap between the sealing ring 12 and the oxygen lance body 1 enters the guide tube 9 connected to the upper end of the sealing plug 7, and then enters the gas collection hood 10 outside the guide tube 9 through the gas guide hole 15. The gas is then discharged through the pipe interface 11 on one side of the gas collection hood 10 into the secondary dust removal pipe of the converter, thus achieving smokeless operation of the oxygen lance insertion hole in the converter smelting.

[0033] An embodiment of this utility model is as follows:

[0034] The outer diameter of the insertion hole connecting flange 3 is 1320mm, the inner diameter is 800mm, and the thickness is 20mm;

[0035] The outer diameter of the sealing seat 5 is 1220mm, the inner diameter is 780 / 700mm, and the thickness is 100mm;

[0036] The diameter of connecting bolt 4 is 20mm and the length is 60mm;

[0037] The support limiting block 6 has a length of 110mm, a width of 60mm, and a thickness of 30mm;

[0038] The upper end face diameter of the sealing plug 7 is 780mm, the lower end face diameter is 530mm, and the height is 375mm;

[0039] The outer diameter of the guide tube 8 is 780mm, the inner diameter is 333mm, and the height is 552mm;

[0040] The outer diameter of the sealing cover 9 is 1080mm, the inner diameter is 333mm, and the thickness is 30mm;

[0041] The gas collection hood 10 has an outer diameter of 1220 mm, an inner diameter of 980 mm, and a height of 600 mm.

[0042] The length of pipe joint 11 is 200mm and the diameter is 273mm;

[0043] The outer diameter of the sealing ring 12 is 600 mm, the inner diameter is 333 mm, and the thickness is 60 mm.

[0044] The high-temperature resistant strong magnet 13 has a diameter of 35mm and a length of 15mm.

Claims

1. A sealing device for the oxygen lance insertion hole of a converter, characterized in that: It includes an insertion hole connecting flange (3), a sealing seat (5), a support limiting block (6), a sealing plug (7), a guide tube (8), a sealing cover plate (9), a gas collection hood (10), and a pipe interface (11). The insertion hole connecting flange (3) is welded to the outer periphery of the upper end of the oxygen lance insertion hole (2). The sealing seat (5) is a ring. The outer periphery of the ring of the sealing seat (5) is connected to the insertion hole connecting flange (3) by connecting bolts (4). The inner hole of the ring of the sealing seat (5) is conical. The lower end of the conical inner hole of the ring of the sealing seat (5) matches the upper diameter of the oxygen lance insertion hole (2). Four support limiting blocks (6) are evenly welded around the oxygen lance body (1). The sealing plug (7) is a ring. The inner hole of the ring of the sealing plug (7) matches the outer diameter of the oxygen lance body (1). The sealing plug (7) is fitted onto the oxygen lance body (1). The lower end face of the ring is placed on the support limiting block (6). The outer circumference of the ring of the sealing plug (7) is conical. The outer conical shape of the sealing plug (7) matches the conical shape of the inner hole of the ring of the sealing seat (5). The outer circumference of the sealing plug (7) is connected to the inner hole of the sealing seat (5). The guide tube (8) is a cylindrical body. The lower end of the guide tube (8) is welded to the upper end face of the sealing plug (7). The upper end of the guide tube (8) is welded to the sealing cover plate (9). The gas collection hood (10) is a cylindrical body. The gas collection hood (10) is sleeved on the outside of the guide tube (8). The lower end of the gas collection hood (10) is welded to the upper outer edge of the sealing seat (5). The outer edge of the sealing cover plate (9) covers the upper end of the gas collection hood (10). One side of the gas collection hood (10) is connected to the pipe interface (11). The pipe interface (11) is connected to the secondary dust removal pipe of the converter.

2. The sealing device for the converter oxygen lance insertion hole according to claim 1, characterized in that: The sealing seat (5) has an outwardly protruding flange at the lower end of the outer circumference of the ring. The outer circumference flange of the sealing seat (5) is connected to the insertion hole connecting flange (3) by connecting bolts (4).

3. The sealing device for the converter oxygen lance insertion hole according to claim 1, characterized in that: The upper end face of the sealing plug (7) has a sealing ring (12). The inner diameter of the sealing ring (12) matches the diameter of the oxygen lance body (1). The sealing ring (12) is fitted onto the oxygen lance body (1). Multiple round holes are evenly distributed around the circumference of the sealing ring (12). Multiple high-temperature resistant strong magnets (13) are respectively embedded in the round holes around the circumference of the sealing ring (12). The lower end face of the sealing ring (12) is tightly attracted and connected to the upper end face of the sealing plug (7) through the high-temperature resistant strong magnets (13).

4. The sealing device for the converter oxygen lance insertion hole according to claim 1, characterized in that: The upper and lower parts of the tube (8) are welded with two partitions (14). The partitions (14) have a central hole that matches the oxygen lance body (1). The central hole of the partitions (14) is fitted around the outer periphery of the oxygen lance body (1). Multiple air guide holes (15) are evenly distributed on the tube wall of the tube (8). The air guide holes (15) are connected to the inner cavity of the gas collection hood (10) outside the tube (8).

5. The sealing device for the converter oxygen lance insertion hole according to claim 1, characterized in that: The cylindrical body of the gas collection hood (10) consists of an outer sleeve (16), an inner sleeve (17), and a ring (18). The outer sleeve (16) is fitted around the outer circumference of the inner sleeve (17). The upper and lower ends of the outer sleeve (16) and the inner sleeve (17) are respectively connected to the ring (18). There are multiple air inlet holes between the upper end of the ring (18) and the upper end of the inner sleeve (17). The inner side of the inner sleeve (17) is opposite to the outer side of the outer wall of the guide tube (8). The outer edge of the sealing cover plate (9) above the gas collection hood (10) covers the upper end of the ring (18). The pipe interface (11) is a sleeve with a rectangular cross section. The pipe interface (11) is placed horizontally. There is an interface connection hole on the outer sleeve wall of the gas collection hood (10). One end of the pipe interface (11) is welded to the interface connection hole of the outer sleeve wall.

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