Anti-cracking sealing type RH refining furnace immersion tube

Abstract

The application discloses a kind of anti-crack sealing type RH refining furnace impregnation tube, it is related to the technical field of iron and steel metallurgical equipment, it includes by inside and outside sequentially coaxially set refractory ring brick, filler layer, steel tube and castable layer, multiple anchor bodies are arranged in the castable layer, the anchor body and the outer wall of the steel tube are fixedly connected, the castable layer is also embedded with reinforced steel mesh tube, the reinforced steel mesh tube and the steel tube are coaxial, the castable layer is internally strengthened and supported by reinforced steel mesh tube, with the technical effect of improving the anti-crack performance of impregnation tube.

Description

Technical Field

[0001] This application relates to the technical field of steel metallurgical equipment, and more specifically, to a crack-resistant, sealed RH refining furnace impregnation tube. Background Technology

[0002] In the RH vacuum refining unit, the impregnation tube is located at the bottom of the vacuum tank and is directly inserted into the molten steel to achieve vacuum circulation of the molten steel. The impregnation tube is a multi-layered cylinder, consisting of, from the inside out, a working layer (refractory ring brick), a filler layer, a steel liner, and a castable layer. Multiple anchor bodies can be installed in the castable layer, which are fixed to the steel liner to improve the relative stability of the castable and the steel liner.

[0003] Compared to nitrogen control in other steel mill processes, controlling nitrogen increase in RH (refining) is the most challenging task. This is because, on one hand, RH refining primarily involves high-alloy steel and ultra-low-carbon steel, which undergoes alloying with various ferroalloys and metallic aluminum. Ferroalloys have a high nitrogen content, and their addition inevitably leads to nitrogen increase. On the other hand, the vacuum environment of RH refining results in extremely high steel circulation; any leaks in the vacuum chamber or immersion tubes will cause a dramatic increase in nitrogen.

[0004] In traditional RH refining furnaces, cracks in the refractory casting of the immersion tube, insufficient anchor welding strength leading to refractory spalling, and poor sealing at the welded joint between the immersion tube and the vacuum chamber can cause problems. Under the high-temperature environment of RH, if cracks appear at the welded joints of the immersion tube steel structure and the lower tank body steel structure, the cooling air of the immersion tube will penetrate through the cracks into the refractory brick layer of the immersion tube and the lower tank, and enter the molten steel, resulting in nitrogen enrichment.

[0005] In conclusion, how to improve the crack resistance of impregnated tubes is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a crack-resistant, sealed RH refining furnace impregnation tube, which effectively improves the crack resistance of the impregnation tube.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A crack-resistant, sealed RH refining furnace impregnation tube includes a refractory ring brick, a filler layer, a steel liner, and a castable layer coaxially arranged from the inside out. Multiple anchor bodies are provided in the castable layer, and the anchor bodies are fixedly connected to the outer wall of the steel liner. A reinforcing steel mesh cylinder is also embedded in the castable layer, and the reinforcing steel mesh cylinder is coaxial with the steel liner.

[0009] Preferably, the anchor body includes a connecting straight plate and a forked plate, the connecting straight plate and the steel cylinder are welded and fixed, the forked plate is fixedly connected to the end of the connecting straight plate away from the steel cylinder, and a single connecting straight plate and multiple forked plates are connected.

[0010] Preferably, a bending plate is fixedly connected to one end of the connecting straight plate near the steel cylinder. Part of the surface of the connecting straight plate is parallel to the radial direction of the steel cylinder, the surface of the bending plate is perpendicular to the surface of the connecting straight plate, the surface of the bending plate is in contact with the cylinder wall of the steel cylinder, and the weld between the anchor body and the steel cylinder is located around the bending plate.

[0011] Preferably, the number of branch plates connected to a single connecting straight plate is two, and the two branch plates are integrally formed with the connecting straight plate through a bending process, and the bending directions of the two branch plates relative to the connecting straight plate are opposite.

[0012] Preferably, the reinforced steel mesh cylinder has a plurality of structural holes through which the anchor body passes, and the end of the anchor body away from the steel inner cylinder is located on the outside of the reinforced steel mesh cylinder.

[0013] Preferably, the reinforced steel mesh cylinder includes multiple warp wires and multiple weft wires. The length direction of the warp wires is parallel to the axis of the steel inner cylinder. The multiple warp wires are arranged in a circular array around the steel inner cylinder. The length direction of the weft wires is circumferential to the steel inner cylinder. The multiple weft wires are arranged in an array along the axial direction of the steel inner cylinder. The weft wires alternately wrap around each two adjacent warp wires.

[0014] Preferably, a connecting wire is fixedly connected to the end of the wire, the length direction of the connecting wire is the radial direction of the steel tube, and the end of the connecting wire away from the wire is welded and fixed to the steel tube.

[0015] Preferably, part of the anchor body is located at the end of the steel liner, the connecting straight plate of the anchor body is welded to the wall of the steel liner, and the connecting steel wire is located within the length range of the anchor body.

[0016] Preferably, the outer wall of the steel tank is fixedly connected with a plurality of blocking baffles, the surface of the blocking baffles being perpendicular to the axis of the steel tank.

[0017] Preferably, the steel tube includes multiple segmented tubes, which are arranged sequentially along the axial direction. Adjacent segmented tubes are fixed by welding. The end face edges of the segmented tubes are provided with a chamfered structure, and a welding groove is formed between two adjacent segmented tubes that are spliced ​​together.

[0018] The crack-resistant, sealed RH refining furnace impregnation tube provided in this application uses multiple anchor bodies extending into the castable refractory layer to improve the relative tightness of the two-layer structure. The reinforcing steel mesh, coaxial with the steel shell, essentially penetrates the entire axial and circumferential directions of the castable refractory layer, forming an internal skeleton that supports the material within the layer, thus improving the overall structural strength of the refractory layer and consequently enhancing the crack resistance of the impregnation tube. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of the overall structure of the impregnation tube for the crack-resistant and sealing RH refining furnace in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram illustrating the structure of the anchor body in the embodiments of this application;

[0022] Figure 3 This is a cross-sectional view of the structure of the steel tank tube when it is spliced ​​from multiple segmented tubes, as shown in the embodiments of this application.

[0023] Figures 1-3 In the accompanying drawings, the reference numerals include:

[0024] 1. Refractory ring bricks; 11. Filler layer; 2. Steel inner tube; 21. Segmented tube; 22. Welding trough; 3. Castable layer; 31. Reinforcing steel mesh tube; 311. Warp wire; 312. Weft wire; 313. Connecting wire; 32. Blocking partition; 4. Anchor body; 41. Connecting straight plate; 42. Bending plate; 43. Forking plate. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0026] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar words used in this application do not indicate any order, quantity, or importance. Terms such as "connection" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes. An embodiment of this application discloses a crack-resistant, sealed RH refining furnace impregnation tube.

[0027] The core of this application is to provide a crack-resistant, sealed RH refining furnace impregnation tube.

[0028] Please refer to Figure 1 .

[0029] The crack-resistant, sealed RH refining furnace impregnation tube provided in this application includes, from the inside out, a refractory ring brick 1, a filler layer 11, a steel cylinder 2, and a castable layer 3 formed by castable refractory. Multiple anchor bodies 4 are provided within the castable layer 3, and the anchor bodies 4 are fixedly connected to the outer wall of the steel cylinder 2. The multiple anchor bodies 4 are evenly distributed around the outer perimeter of the steel cylinder 2 to improve the connection and tightness of the steel cylinder 2 to the castable material within the castable layer.

[0030] A reinforcing steel mesh cylinder 31 is also embedded within the castable refractory layer 3. The reinforcing steel mesh cylinder 31 is a cylindrical structure woven from steel wire. Before the material is filled into the castable refractory layer 3, the reinforcing steel mesh cylinder 31 is coaxially sleeved on the outside of the steel inner cylinder 2, forming a uniform gap between the two. After the material of the castable refractory layer 3 is shaped, the reinforcing steel mesh forms a supporting inner skeleton that basically runs through the circumference and axial direction of the castable refractory layer 3, providing stable and uniform strength support for the material of the castable refractory layer, thereby improving the crack resistance of the impregnated pipe.

[0031] The crack-resistant, sealed RH refining furnace impregnation tube provided in this application will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0032] In one specific implementation, reference is made to... Figure 1 and Figure 2 .

[0033] Specifically, the anchor body 4 includes a connecting straight plate 41 and a forked plate 43. The connecting straight plate 41 is welded and fixed to the outer wall of the steel tube 2, and the forked plate 43 is fixedly connected to the end of the connecting straight plate 41 away from the steel tube 2. A single connecting straight plate 41 is connected to multiple forked plates 43. That is, the anchor body 4 forms a forked structure on the outside of the steel tube 2, which increases the effective contact area of ​​the anchor body 4 with the castable material, so that the steel tube 2 has an anchoring force effect on the material of the castable layer 3.

[0034] Based on the above embodiments, refer to Figure 1 and Figure 2 .

[0035] Specifically, the anchor body 4 is in the shape of "L+Y". A bent plate 42 is fixedly connected to one end of the connecting straight plate 41 near the steel tube 2. Part of the surface of the connecting straight plate 41 is parallel to the radial direction of the steel tube 2, and the surface of the bent plate 42 is perpendicular to the surface of the connecting straight plate 41. That is, the extension direction of this part of the anchor body 4 relative to the steel tube 2 is positively away from the axis of the steel tube.

[0036] The surfaces of the bent plate 42 and the connecting straight plate 41 are perpendicular to each other. In the specific implementation process, the bent plate 42 is integrally formed by bending the end of the straight plate. The surface of the bent plate 42 is in close contact with the wall of the steel tube 2. The weld between the anchor body 4 and the steel tube 2 is located around the bent plate 42. The outline of the bent plate 42 is the weld between the anchor body 4 and the steel tube 2, which makes the weld between the two more secure.

[0037] Based on the above embodiments, refer to Figure 2 .

[0038] Specifically, the number of branch plates 43 connected to a single connecting straight plate 41 is two. Both branch plates 43 are integrally formed with the connecting straight plate 41 through a bending process, and the bending directions of the two branch plates 43 are opposite to those of the connecting straight plate 41.

[0039] To improve the overall anchoring strength of the anchor body 4 to the castable refractory, the orientation of the bifurcated plates 43 should be increased. During the process of connecting each anchor body 4 to the side wall of the steel cylinder 2, the bifurcated plates 43 of some anchor bodies 4 bifurcate laterally and oppositely, while the bifurcated plates 43 of some anchor bodies 4 bifurcate vertically and oppositely.

[0040] Based on the above embodiments, refer to Figure 1 .

[0041] Specifically, the reinforcing steel mesh cylinder 31 has several structural holes through which the anchor body 4 passes. The end of the anchor body 4 away from the steel inner cylinder 2 is located on the outside of the reinforcing steel mesh cylinder 31. Thus, part of the anchor body 4 passes through the reinforcing steel mesh cylinder 31. In actual implementation, the reinforcing steel mesh cylinder 31 is first placed on the outside of the steel inner cylinder 2, and then the anchor body 4 is welded.

[0042] During the welding process of placing the anchor body 4 on the wall of the steel inner tube 2, some of the forked plates 43 of the anchor body 4 come into contact with the steel wire of the reinforcing steel mesh tube 31, thus forming a lattice support for the reinforcing steel mesh tube 31 after welding and fixing, which improves the relative positional stability of the reinforcing steel mesh tube 31 and the steel inner tube 2.

[0043] Based on any of the above embodiments, refer to Figure 1 .

[0044] Specifically, the reinforced steel mesh cylinder 31 includes multiple warp wires 311 and multiple weft wires 312. The length direction of the warp wires 311 is parallel to the axis of the steel inner cylinder 2, and the multiple warp wires 311 are arranged in a circular array around the steel inner cylinder 2. The length direction of the weft wires 312 is circumferential to the steel inner cylinder 2, and the multiple weft wires 312 are arranged in an axial array along the steel inner cylinder 2. The two ends of each weft wire 312 are connected to each other to achieve a fixed shape; that is, each warp wire 311 passes through all the weft wires 312, and each weft wire 312 also passes through all the warp wires 311, forming a rectangular structural hole.

[0045] The weft wires 312 alternately wrap around each pair of adjacent warp wires 311. That is, each warp wire 311 and each weft wire 312 are combined and connected by a warp and weft weaving method, which makes the reinforced steel mesh cylinder 31 have high structural stability.

[0046] Based on the above embodiments, refer to Figure 1 .

[0047] Specifically, a connecting wire 313 is fixedly connected to the end of the wire 311. The length direction of the connecting wire 313 is radial to the steel tube 2. The end of the connecting wire 313 away from the wire 311 is welded and fixed to the end face of the steel tube 2, thereby achieving a fixed connection between the reinforced steel mesh tube 31 and the steel tube 2.

[0048] Based on the above embodiments, refer to Figure 1 .

[0049] Specifically, a portion of the castable refractory layer 3 is located at the lower end of the steel cylinder 2, and a portion of the anchor body 4 is located at the end of the steel cylinder 2. This portion of the anchor body 4 is welded to the connecting straight plate 41 and the outer wall of the steel cylinder 2, with the weld located at the opposite edges of the connecting straight plate 41. The connecting steel wire 313 is located within the length of this portion of the anchor body 4, meaning that this portion of the anchor body 4 is used to improve the structural stability of the castable refractory below the end face of the steel cylinder 2.

[0050] Based on any of the above embodiments, refer to Figure 1 .

[0051] Specifically, multiple blocking baffles 32 are fixedly connected to the outer wall of the steel liner 2, with the baffle surface perpendicular to the axis of the steel liner 2. The blocking baffles 32 are located inside the reinforcing steel mesh cylinder 31 and are fixed to the steel liner 2 by welding, with the weld located at the edge where they contact. The blocking baffles 32 are used to disperse the axial stress of the castable refractory, prevent the generation of through cracks, and improve the overall sealing performance of the impregnated pipe castable refractory.

[0052] In some embodiments, reference Figure 3 .

[0053] Specifically, the steel inner tube 2 is not a single, continuous tube, but comprises multiple segmented tubes 21 arranged sequentially along the axial direction. Adjacent segmented tubes 21 are fixed together by welding. The end faces of the segmented tubes 21 are chamfered, and a V-shaped weld groove 22 is formed between adjacent joined segmented tubes 21 through the chamfered structure. Both the inner and outer walls of the steel inner tube 2 have this structure. During welding, the weld groove 22 helps to improve the contact and fusion between the weld and the segmented tubes 21, thereby improving the quality of the weld formation.

[0054] 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.

[0055] The above provides a detailed description of a crack-resistant, sealed RH refining furnace impregnation tube provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A crack-resistant, sealing type RH refining furnace impregnation tube, characterized in that, It includes a refractory ring brick (1), a filler layer (11), a steel cylinder (2) and a castable layer (3) arranged coaxially from the inside out. The castable layer (3) is provided with multiple anchor bodies (4). The anchor bodies (4) are fixedly connected to the outer wall of the steel cylinder (2). The castable layer (3) is also embedded with a reinforcing steel mesh cylinder (31). The reinforcing steel mesh cylinder (31) and the steel cylinder (2) are coaxial.

2. The crack-resistant, sealed RH refining furnace impregnation tube according to claim 1, characterized in that, The anchor body (4) includes a connecting straight plate (41) and a forked plate (43). The connecting straight plate (41) and the steel tube (2) are welded and fixed. The forked plate (43) is fixedly connected to one end of the connecting straight plate (41) away from the steel tube (2). A single connecting straight plate (41) and multiple forked plates (43) are connected.

3. The crack-resistant, sealed RH refining furnace impregnation tube according to claim 2, characterized in that, A bent plate (42) is fixedly connected to one end of the connecting straight plate (41) near the steel cylinder (2). Part of the plate surface of the connecting straight plate (41) is parallel to the radial direction of the steel cylinder (2). The plate surface of the bent plate (42) is perpendicular to the plate surface of the connecting straight plate (41). The plate surface of the bent plate (42) is in contact with the cylinder wall of the steel cylinder (2). The weld between the anchor body (4) and the steel cylinder (2) is located around the bent plate (42).

4. The crack-resistant, sealed RH refining furnace impregnation tube according to claim 3, characterized in that, The number of branch plates (43) connected to a single connecting straight plate (41) is two. The two branch plates (43) are integrally formed with the connecting straight plate (41) through a bending process, and the bending directions of the two branch plates (43) relative to the connecting straight plate (41) are opposite.

5. The crack-resistant, sealing RH refining furnace impregnation tube according to any one of claims 2-4, characterized in that, The reinforced steel mesh cylinder (31) has a number of structural holes through which the anchor body (4) passes. The end of the anchor body (4) away from the steel inner cylinder (2) is located on the outside of the reinforced steel mesh cylinder (31).

6. The crack-resistant, sealed RH refining furnace impregnation tube according to claim 4, characterized in that, The reinforced steel mesh cylinder (31) includes multiple warp wires (311) and multiple weft wires (312). The length direction of the warp wires (311) is parallel to the axis of the steel inner cylinder (2). The multiple warp wires (311) are arranged in a ring array around the steel inner cylinder (2). The length direction of the weft wires (312) is the circumference of the steel inner cylinder (2). The multiple weft wires (312) are arranged in an array along the axial direction of the steel inner cylinder (2). The weft wires (312) alternately pass around each two adjacent warp wires (311).

7. The crack-resistant, sealed RH refining furnace impregnation tube according to claim 6, characterized in that, A connecting wire (313) is fixedly connected to the end of the wire (311). The length direction of the connecting wire (313) is the radial direction of the steel tube (2). The end of the connecting wire (313) away from the wire (311) is welded and fixed to the steel tube (2).

8. The crack-resistant, sealed RH refining furnace impregnation tube according to claim 7, characterized in that, Part of the anchor body (4) is located at the end of the steel tube (2), the connecting straight plate (41) of the anchor body (4) is welded to the wall of the steel tube (2), and the connecting steel wire (313) is located within the length range of the anchor body (4).

9. The crack-resistant, sealed RH refining furnace impregnation tube according to any one of claims 1-4, characterized in that, The outer wall of the steel tube (2) is fixedly connected with a plurality of blocking baffles (32), and the surface of the blocking baffles (32) is perpendicular to the axis of the steel tube (2).

10. The crack-resistant, sealing RH refining furnace impregnation tube according to any one of claims 1-4, characterized in that, The steel tube (2) includes multiple segment tubes (21), which are arranged sequentially along the axial direction. Adjacent segment tubes (21) are fixed by welding. The end face edges of the segment tubes (21) are provided with a chamfer structure. A welding groove (22) is formed between two adjacent segment tubes (21) that are spliced ​​together.

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