Auxiliary sleeve adaptive to large sleeve of blast furnace air supply tuyere

Abstract

The utility model discloses an auxiliary sleeve matched with a blast furnace air supply tuyere large sleeve, which relates to the technical field of blast furnace tuyeres and comprises an auxiliary sleeve body and a leaking stoppage sleeve, the leaking stoppage sleeve is sleeved on the periphery of the auxiliary sleeve body, and the auxiliary sleeve body is used for being assembled in the blast furnace tuyere large sleeve and pressing the leaking stoppage sleeve to be attached to the inner wall of the tuyere large sleeve. A through hole is formed in the auxiliary sleeve body, and hot air and pulverized coal enter the blast furnace through the through hole; the auxiliary sleeve body is assembled into the tuyere large sleeve of the blast furnace, and the leaking stoppage sleeve is pressed to be attached to the inner wall of the tuyere large sleeve, so that the leaking stoppage sleeve can block a damaged area of the tuyere large sleeve, the phenomenon that gas flows outwards due to cracking and welding opening of the inner wall of the tuyere large sleeve is effectively improved, a good leaking stoppage effect is achieved on gas leakage points, and the service life of the blast furnace is prolonged. And gas leakage is reduced, smelting cost is reduced, and a relatively safe working environment is created.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace tuyere technology, and in particular to an auxiliary sleeve adapted to the large sleeve of blast furnace tuyere. Background Technology

[0002] The blast furnace is the most important ironmaking equipment in the modern steel industry, which uses coke to reduce iron ore to produce pig iron. The blast furnace body is usually composed of a steel plate shell and a refractory brick lining, and is mainly divided into five parts from top to bottom: the throat, the body, the waist, the belly, and the hearth.

[0003] In the blast furnace smelting process, the tuyere is a crucial component. As the only channel for hot air (and sometimes pulverized coal) to enter the blast furnace, it is a core element of the blast furnace air supply system. The service life of the tuyere directly affects the stable operation of the blast furnace, the output and quality of pig iron, and the labor intensity of the workers. To improve the durability of the tuyere body, the industry commonly uses technologies such as thermal spraying and welding to prepare wear-resistant and high-temperature oxidation-resistant coatings on its copper alloy surface.

[0004] As a key load-bearing and connecting component of the blast furnace air supply pipeline and tuyere system, the tuyere sleeve plays an indispensable role. Its main functions include: supporting the nested inner tuyere sleeve and the foremost small tuyere sleeve; and securely connecting, sealing, and installing the entire tuyere system (including the inner sleeve, small sleeve, and auxiliary components such as cooling water pipes) onto the blast furnace body. The tuyere sleeve is typically designed as a hollow frustum-shaped structure, usually made of cast iron or cast steel, with serpentine cooling water pipes cast inside to continuously circulate cooling water and remove heat. The front end of the tuyere sleeve has a conical surface designed for a tight fit with the upper conical surface of the inner tuyere sleeve; its upper end is fixedly connected to the blast furnace body via a flange or similar structure, ensuring the stability and sealing of the entire tuyere system.

[0005] However, after long-term continuous operation, the blast furnace is subjected to a variety of complex and harsh conditions such as high temperature, high pressure, thermal stress cycle and gas scouring, which causes cracks and weld breaks in the inner wall of the tuyeres, resulting in gas leakage and blast furnace gas leakage, which seriously affects the production of the blast furnace and affects the safe production of the blast furnace.

[0006] Therefore, how to improve the phenomenon of gas leakage caused by cracking and welding failure of the inner wall of the tuyere casing is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0007] The purpose of this utility model is to provide an auxiliary sleeve that is compatible with the tuyere sleeve of a blast furnace, which can improve the phenomenon of gas leakage caused by cracking and welding failure of the inner wall of the tuyere sleeve.

[0008] To achieve the above objectives, this utility model provides an auxiliary sleeve adapted to the tuyere sleeve of a blast furnace, comprising an auxiliary sleeve body and a plugging sleeve. The plugging sleeve is fitted around the outer periphery of the auxiliary sleeve body. The auxiliary sleeve body is used to assemble into the tuyere sleeve of the blast furnace and press the plugging sleeve tightly against the inner wall of the tuyere sleeve, so that the plugging sleeve covers the damaged area of ​​the tuyere sleeve. The auxiliary sleeve body has a through hole for supplying hot air and pulverized coal into the blast furnace.

[0009] In one possible implementation, the auxiliary sleeve body is a hollow frustum structure. The auxiliary sleeve body includes a first end with a larger cross-sectional diameter perpendicular to the axis of the through hole and a second end with a smaller cross-sectional diameter perpendicular to the axis of the through hole. The auxiliary sleeve body also includes a first limiting structure located on the outer periphery of the first end. The first limiting structure abuts against the end of the plugging sleeve opposite to the second end to restrict the plugging sleeve from detaching from the auxiliary sleeve body in the direction opposite to the second end.

[0010] In one possible implementation, the auxiliary sleeve body further includes a second limiting structure located on the outer periphery of the second end, the second limiting structure abutting against the end of the plugging sleeve facing the second end, so as to restrict the plugging sleeve from disengaging from the auxiliary sleeve body in the direction facing the second end.

[0011] In one possible implementation, both the first limiting structure and the second limiting structure are annular protrusions. The radial distance between the first limiting structure and the outer peripheral surface of the auxiliary sleeve body is equal to the radial distance between the second limiting structure and the outer peripheral surface of the auxiliary sleeve body. The taper of both the first limiting structure and the second limiting structure is the same as the taper of the vent sleeve.

[0012] In one possible implementation, the auxiliary sleeve body is welded to the vent sleeve or connected by bolts and threads to fix the auxiliary sleeve body to the vent sleeve.

[0013] In one possible implementation, the inner wall of the leak-sealing sleeve and the vent sleeve are interference-fitted.

[0014] In one possible implementation, the auxiliary sleeve body is an integral structure.

[0015] In one possible implementation, the plugging sleeve is made of unshaped refractory material.

[0016] In one possible implementation, an annular groove is formed between the first limiting structure and the second limiting structure. The annular groove contains a rope wrapped around the outer periphery of the auxiliary sleeve body and a material in contact with the rope. The rope and the material are used to form a leak-stopping sleeve located in the annular groove.

[0017] In one possible implementation, the auxiliary sleeve body is made of metal.

[0018] Compared with the prior art, the auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres provided by this utility model has at least the following beneficial effects:

[0019] The auxiliary sleeve includes an auxiliary sleeve body and a plugging sleeve fitted around the outer periphery of the auxiliary sleeve body. The auxiliary sleeve body has through holes for hot air and pulverized coal to enter the blast furnace. By assembling the auxiliary sleeve body into the tuyeres of the blast furnace and pressing the plugging sleeve tightly against the inner wall of the tuyeres, the plugging sleeve can seal the damaged areas of the tuyeres, effectively improving the phenomenon of gas leakage caused by cracks and weld breaks in the inner wall of the tuyeres. It has a good sealing effect on gas leakage points, reduces gas leakage, lowers smelting costs, and creates a relatively safe working environment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 A cross-sectional view of the auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres provided in this embodiment of the utility model;

[0022] Figure 2 This is a cross-sectional view of the auxiliary sleeve body provided in an embodiment of the present utility model.

[0023] in:

[0024] 1-Auxiliary sleeve body, 11-Through hole, 12-First end, 13-Second end, 14-First limiting structure, 15-Second limiting structure, 16-Annular groove;

[0025] 2-Leak-stopping sleeve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.

[0029] The purpose of this utility model is to provide an auxiliary sleeve that is compatible with the tuyere sleeve of a blast furnace, which can improve the phenomenon of gas leakage caused by cracking and welding failure of the inner wall of the tuyere sleeve.

[0030] Please see Figure 1 and Figure 2 To achieve the above objectives, this utility model provides an auxiliary sleeve adapted to the tuyere sleeve of a blast furnace, comprising an auxiliary sleeve body 1 and a plugging sleeve 2. The plugging sleeve 2 is fitted around the outer periphery of the auxiliary sleeve body 1. The auxiliary sleeve body 1 is used to assemble into the tuyere sleeve of the blast furnace and press the plugging sleeve 2 tightly against the inner wall of the tuyere sleeve, so that the plugging sleeve 2 covers the damaged area of ​​the tuyere sleeve. The auxiliary sleeve body 1 has a through hole 11 for supplying hot air and pulverized coal into the blast furnace. The auxiliary sleeve body 1 has a hollow frustum structure. The auxiliary sleeve body 1 is similar in shape to the tuyere sleeve. The auxiliary sleeve body 1 is an overall frustum thin-walled structure. It should be noted that the damaged area refers to the area where the crack or weld is broken in the inner wall of the tuyere sleeve.

[0031] The leak-stopping sleeve 2 and the inner wall of the vent sleeve can be interference-fitted so that the outer periphery of the leak-stopping sleeve 2 fits tightly with the inner wall of the vent sleeve, thereby effectively improving the shielding effect on the damaged area.

[0032] It should be noted that the auxiliary sleeve body 1 can be made of metal, using the same or similar metal material as the vent sleeve, and formed by casting or machining. The sealing sleeve 2 can also be a frustum thin-walled structure to fit the outer circumference of the auxiliary sleeve body 1 and the inner wall of the vent sleeve. In use, the auxiliary sleeve body 1 needs to be inserted into the vent sleeve so that the sealing sleeve 2, which is fitted on the outer circumference of the auxiliary sleeve body 1, can cover the cracked or welded parts of the vent sleeve.

[0033] The auxiliary sleeve includes an auxiliary sleeve body 1 and a plugging sleeve 2 fitted around the outer periphery of the auxiliary sleeve body 1. The auxiliary sleeve body 1 has through holes 11 for hot air and pulverized coal to enter the blast furnace. By assembling the auxiliary sleeve body 1 into the tuyeres of the blast furnace and pressing the plugging sleeve 2 tightly against the inner wall of the tuyeres, the plugging sleeve 2 can seal the damaged area of ​​the tuyeres, effectively improving the phenomenon of gas leakage caused by cracks and weld breaks in the inner wall of the tuyeres. It has a good sealing effect on gas leakage points, reduces gas leakage, lowers smelting costs, and creates a relatively safe working environment.

[0034] Specifically, before the auxiliary sleeve body 1 enters the tuyere main sleeve, the leak-sealing sleeve 2 is first fitted onto the outer periphery of the auxiliary sleeve body 1. Then, during a ventilation shutdown, the auxiliary sleeve body 1 with the leak-sealing sleeve 2 fitted is pressed into the damaged area inside the tuyere main sleeve. This pressing process can be achieved through a pressing device, so that the leak-sealing sleeve 2 is compacted with the damaged area of ​​the inner wall of the tuyere main sleeve, forming a whole, preventing gas from escaping from the cracks in the inner wall of the tuyere main sleeve.

[0035] In one possible implementation, the through hole 11 is a tapered hole, that is, the inner wall of the through hole 11 is a tapered surface. The through hole 11 is opened in the middle of the auxiliary sleeve body 1 so that the auxiliary sleeve body 1 is a hollow frustum thin-walled structure. The axis of the through hole 11 is collinear with the axis of the auxiliary sleeve body 1. The auxiliary sleeve body 1 includes a first end 12 with a larger cross-sectional diameter perpendicular to the axial direction of the through hole 11 and a second end 13 with a smaller cross-sectional diameter perpendicular to the axial direction of the through hole 11. During the process of the auxiliary sleeve body 1 entering the vent sleeve, the second end 13 of the auxiliary sleeve body 1 enters the vent sleeve first, and the through hole 11 of the auxiliary sleeve body 1 enters the vent sleeve later. Inside the large vent sleeve, the auxiliary sleeve body 1 also includes a first limiting structure 14 located on the outer periphery of the first end 12. The first limiting structure 14 abuts against the end of the plugging sleeve 2 away from the second end 13, so as to limit the phenomenon that the frictional resistance between the plugging sleeve 2 and the inner wall of the large vent sleeve causes the plugging sleeve 2 to slide relative to the auxiliary sleeve body 1 during the process of the auxiliary sleeve body 1 driving the plugging sleeve 2 to be installed to the inner wall of the large vent sleeve. That is, the first limiting structure 14 restricts the plugging sleeve 2 from leaving the auxiliary sleeve body 1 in the direction away from the second end 13, so as to ensure that the plugging sleeve 2 can be accurately moved to the damaged area of ​​the large vent sleeve to form a shield for the damaged area.

[0036] In one possible implementation, the auxiliary sleeve body 1 further includes a second limiting structure 15 located on the outer periphery of the second end 13. The second limiting structure 15 abuts against the end of the plugging sleeve 2 facing the second end 13 to restrict the plugging sleeve 2 from detaching from the auxiliary sleeve body 1 in the direction facing the second end 13. It is understood that when the auxiliary sleeve needs to be repaired or replaced, the auxiliary sleeve body 1 and the plugging sleeve 2 need to be disassembled from the vent sleeve. During the process of the auxiliary sleeve body 1 being moved out of the vent sleeve, frictional resistance will be generated between the plugging sleeve 2 and the vent sleeve, which will prevent the plugging sleeve 2 from moving with the auxiliary sleeve body 1. This results in the auxiliary sleeve body 1 and the plugging sleeve 2 being disassembled in steps, which is time-consuming and laborious. However, by setting the second limiting structure 15 on the outer periphery of the second end 13, the position of the plugging sleeve 2 relative to the auxiliary sleeve body 1 is ensured. At the same time, during the disassembly process, the plugging sleeve 2 abuts against the end of the plugging sleeve 2 facing the second end 13 to drive the plugging sleeve 2 to move out of the vent sleeve with the auxiliary sleeve body 1, thereby improving the disassembly efficiency.

[0037] In one possible implementation, both the first limiting structure 14 and the second limiting structure 15 are annular protrusions. The radial distance between the first limiting structure 14 and the outer peripheral surface of the auxiliary sleeve body 1 is equal to the radial distance between the second limiting structure 15 and the outer peripheral surface of the auxiliary sleeve body 1. The taper of both the first limiting structure 14 and the second limiting structure 15 is the same as the taper of the large air vent sleeve, so that the distance between the first limiting structure 14 and the inner wall of the large air vent sleeve and the distance between the second limiting structure 15 and the inner wall of the large air vent sleeve are equal. That is, when the first limiting structure 14 is in contact with the inner wall of the large air vent sleeve, the second limiting structure 15 is also in contact with the inner wall of the large air vent sleeve.

[0038] In some application scenarios, before the auxiliary sleeve body 1 enters the vent sleeve, the leak-sealing sleeve 2 is first put on the outer periphery of the auxiliary sleeve body 1. The auxiliary sleeve body 1 with the leak-sealing sleeve 2 is then pressed into the damaged area inside the vent sleeve, so that the leak-sealing sleeve 2 is compacted with the damaged area of ​​the inner wall of the vent sleeve and forms a whole. Then, the auxiliary sleeve body 1 is welded to the vent sleeve or connected by bolt threads to fix the auxiliary sleeve body 1 to the vent sleeve and prevent it from being pulled out by thermal stress.

[0039] It should be noted that the auxiliary sleeve body 1 can be configured such that the circumferential surface of at least one of the first limiting structure 14 and the second limiting structure 15 can fit against the inner wall of the large air vent sleeve. That is, there are three cases: the circumferential surface of the first limiting structure 14 fits against the inner wall of the large air vent sleeve; the circumferential surface of the second limiting structure 15 fits against the inner wall of the large air vent sleeve; and both the circumferential surfaces of the first limiting structure 14 and the second limiting structure 15 fit against the inner wall of the large air vent sleeve. This makes the auxiliary sleeve body 1 have a fitting surface that fits against the inner wall of the large air vent sleeve. By welding at the edge of the fitting surface, the auxiliary sleeve body 1 and the inner wall of the large air vent sleeve can be relatively fixed.

[0040] In addition, at least one of the first limiting structure 14 and the second limiting structure 15 can be provided with a plurality of evenly distributed first threaded holes, and a plurality of evenly distributed second threaded holes can be provided at corresponding positions on the inner wall of the vent sleeve. Bolts are then inserted into the corresponding first and second threaded holes to achieve a threaded connection between the auxiliary sleeve body 1 and the inner wall of the vent sleeve, thus achieving relative fixation between the auxiliary sleeve body 1 and the inner wall of the vent sleeve. Of course, welding and bolt threaded connection can coexist to make the connection between the auxiliary sleeve body 1 and the vent sleeve more secure.

[0041] In one possible implementation, the auxiliary sleeve body 1 is an integral structure, that is, the first limiting structure 14 and the second limiting structure 15, which are annular protrusions, are manufactured integrally with the auxiliary sleeve body 1, thereby ensuring the overall structural strength of the auxiliary sleeve body 1.

[0042] In one possible implementation, the leak-sealing sleeve 2 is an unshaped refractory material. Unshaped refractory materials, also called castables, are mixed powdery granules composed of various aggregates and one or more binders. When used, they must be mixed evenly with one or more liquids. They have strong fluidity, which makes the leak-sealing sleeve 2 have a better performance.

[0043] In one possible implementation, an annular groove 16 is formed between the first limiting structure 14 and the second limiting structure 15. The sealing sleeve 2 is disposed within the annular groove 16 and can be used to position the sealing sleeve 2, preventing slippage and deformation of the sealing sleeve 2 during the pressing into the large air vent sleeve. The annular groove 16 contains a rope wound around the outer periphery of the auxiliary sleeve body 1 and a material in contact with the rope. The rope can be, but is not limited to, asbestos rope, and the material can be, but is not limited to, grout or sealing agent. The material is added to the annular groove 16 by pouring, so that the rope and material form the sealing sleeve 2 located within the annular groove 16. This configuration results in a simple structure, low cost, convenient operation, and reliable performance for the sealing sleeve 2.

[0044] In summary, this application provides an auxiliary sleeve adapted to the tuyere sleeve of a blast furnace, comprising an auxiliary sleeve body 1 and a leak-sealing sleeve 2. By fixing the auxiliary sleeve body 1 relative to the tuyere sleeve, the leak-sealing sleeve 2 effectively seals gas leaks at points on the inner wall of the tuyere sleeve, reducing gas leakage, lowering smelting costs, and creating a relatively safe working environment. Furthermore, it extends the service life of the tuyere sleeve, allowing it to be replaced during downtime without needing to be replaced before the scheduled maintenance period. This allows tuyere sleeves with minor damage to reach their rated service life, thereby reducing economic losses, lowering smelting costs, and buying time for adjusting furnace conditions.

[0045] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An auxiliary sleeve adapted to the large sleeve of a blast furnace tuyeres, characterized in that, The system includes an auxiliary sleeve body (1) and a plugging sleeve (2). The plugging sleeve (2) is fitted around the outer periphery of the auxiliary sleeve body (1). The auxiliary sleeve body (1) is used to assemble into the tuyeres of the blast furnace and press the plugging sleeve (2) tightly against the inner wall of the tuyeres, so that the plugging sleeve (2) covers the damaged area of ​​the tuyeres. The auxiliary sleeve body (1) has a through hole (11) for supplying hot air and pulverized coal into the blast furnace.

2. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to claim 1, characterized in that, The auxiliary sleeve body (1) is a hollow frustum structure. The auxiliary sleeve body (1) includes a first end (12) with a larger cross-sectional diameter perpendicular to the axial direction of the through hole (11) and a second end (13) with a smaller cross-sectional diameter perpendicular to the axial direction of the through hole (11). The auxiliary sleeve body (1) also includes a first limiting structure (14) located on the outer periphery of the first end (12). The first limiting structure (14) abuts against the end of the plugging sleeve (2) away from the second end (13) to restrict the plugging sleeve (2) from detaching from the auxiliary sleeve body (1) in the direction away from the second end (13).

3. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to claim 2, characterized in that, The auxiliary sleeve body (1) further includes a second limiting structure (15) located on the outer periphery of the second end (13). The second limiting structure (15) abuts against one end of the plugging sleeve (2) facing the second end (13) to restrict the plugging sleeve (2) from disengaging from the auxiliary sleeve body (1) in the direction facing the second end (13).

4. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to claim 3, characterized in that, Both the first limiting structure (14) and the second limiting structure (15) are annular protrusions. The distance between the first limiting structure (14) and the outer peripheral surface of the auxiliary sleeve body (1) in the radial direction is equal to the distance between the second limiting structure (15) and the outer peripheral surface of the auxiliary sleeve body (1) in the radial direction. The taper of both the first limiting structure (14) and the second limiting structure (15) is the same as the taper of the large air vent sleeve.

5. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to any one of claims 1-4, characterized in that, The auxiliary sleeve body (1) is welded to the air outlet sleeve or connected by bolt threads, so that the auxiliary sleeve body (1) and the air outlet sleeve are relatively fixed.

6. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to any one of claims 1-4, characterized in that, The leak-stopping sleeve (2) and the inner wall of the vent sleeve are interference fit.

7. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to any one of claims 1-4, characterized in that, The auxiliary sleeve body (1) is an integral structure.

8. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to any one of claims 1-4, characterized in that, The plugging sleeve (2) is made of unshaped refractory material.

9. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to claim 4, characterized in that, An annular groove (16) is formed between the first limiting structure (14) and the second limiting structure (15). The annular groove (16) contains a rope wrapped around the outer periphery of the auxiliary sleeve body (1) and a material in contact with the rope. The rope and the material are used to form the plugging sleeve (2) located in the annular groove (16).

10. The auxiliary sleeve adapted to the large sleeve of the blast furnace tuyeres according to any one of claims 1-4, characterized in that, The auxiliary sleeve body (1) is made of metal.

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