Anti-seepage copper oxygen lance sleeve for electric arc furnace smelting

Abstract

The utility model relates to an anti-seepage copper oxygen lance sleeve for electric arc furnace smelting, which comprises a copper sleeve and a fire-resistant sleeve wrapped on the outer ring of the front end of the copper sleeve, the pipe wall of the copper sleeve is of a double-layer hollow structure, two partition plates are fixedly connected in an inner cavity of the pipe wall of the copper sleeve and divide the inner cavity of the pipe wall into two semi-ring-shaped cavities, and the two semi-ring-shaped cavities are communicated with the fire-resistant sleeve. According to the high-cleanliness molten steel smelting furnace, the accident that the whole furnace is scrapped due to the fact that the copper content of the high-cleanliness molten steel exceeds the standard is fundamentally avoided, and production stability and economic benefits are guaranteed; meanwhile, the structural design is compact and reasonable, the cooling uniformity and efficiency are guaranteed through the design of the cooling water flow channel, the combination mode of the fire-resistant sleeve and the copper sleeve is reliable, manufacturing and maintenance are easy, and high practical value is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of electric arc furnace smelting equipment, specifically to a seepage-proof copper oxide lance sleeve for electric arc furnace smelting. Background Technology

[0002] In electric arc furnace steelmaking, the oxygen lance is a crucial piece of equipment for injecting oxygen into the high-temperature molten pool for refining. The front end of the oxygen lance bladder (commonly known as the cooling jacket) is directly inserted into or exposed to the molten steel environment, which reaches temperatures as high as 1600-1700°C, enduring extreme heat loads. To maintain its structural integrity and service life, traditional oxygen lance cooling jackets are generally made of high-purity copper (Cu≥99.9%) and rely on a forced circulation cooling water system for efficient heat dissipation. While this design provides effective cooling, it presents a significant safety hazard: when the cooling water system fails due to insufficient flow, pipe blockage, pump malfunction, or other failures, the pure copper cooling jacket melts very rapidly in the high-temperature molten steel. This melting is particularly fatal for producing high-purity steels with extremely stringent requirements for Cu content (e.g., ≤50ppm). The molten copper will abnormally and uncontrollably melt into the molten steel in large quantities, instantly causing the copper content of the entire furnace of steel to exceed the allowable range significantly, resulting in huge economic losses due to the scrapping of the entire furnace of steel. In existing technologies, the oxygen lance cooling jacket itself lacks an effective melt isolation mechanism when the cooling water fails, making this risk a pain point in the production process of high-purity steel. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a seepage-proof copper oxide lance shroud for electric arc furnace smelting.

[0004] This utility model is achieved through the following technical solution: a seepage-proof copper-oxygen lance liner for electric arc furnace smelting is provided, comprising a copper sleeve and a refractory sleeve wrapped around the outer ring of the front end of the copper sleeve. The tube wall of the copper sleeve has a double-layer hollow structure. Two partitions are fixedly connected to the inner cavity of the tube wall of the copper sleeve, and the two partitions divide the inner cavity of the tube wall into two semi-annular cavities. A water inlet pipe and a water outlet pipe are connected to the copper sleeve, and the water inlet pipe and the water outlet pipe respectively connect to the two semi-annular cavities. A connecting hole is opened on the partition.

[0005] Cooling water enters one side of the semi-annular cavity through the inlet pipe, then enters the other side of the semi-annular cavity through the connecting hole at the front end of the partition, and finally exits from the outlet pipe, thereby cooling the copper sleeve. The refractory sleeve wraps around the front end of the copper sleeve, reducing the temperature of the copper sleeve.

[0006] As an optimization, the front end of the refractory sleeve extends to the front end face of the copper sleeve, thereby providing heat insulation to the front end face of the copper sleeve.

[0007] As an optimization, an annular groove is formed on the inner ring of the front end face of the copper sleeve, and the front end of the refractory sleeve extends into the annular groove. In this design, the front end of the refractory sleeve extends into the annular groove, which serves to insulate the inner hole area of ​​the front end of the copper sleeve, further preventing the copper sleeve from flowing out from the front end of the refractory sleeve after melting.

[0008] As an optimization, a refractory sealant layer is provided between the refractory sleeve and the copper sleeve. In this design, the refractory sealant layer serves to seal the refractory sleeve and the copper sleeve, preventing heat transfer to the copper sleeve.

[0009] As an optimization, a mounting plate is fixedly connected to the copper sleeve, and connecting plates located on both sides of the copper sleeve are fixedly connected to the mounting plate. The connecting plates have mounting holes. In this design, the connecting plates are used to securely install the oxygen lance sleeve.

[0010] As an optimization, multiple connecting holes are provided and arranged in a front-to-back pattern. This allows for connectivity through the multiple connecting holes arranged in a front-to-back pattern.

[0011] As an optimization, the length of the portion of the refractory sleeve wrapping the copper sleeve is 0.5-0.7 times the total length of the copper sleeve. This provides effective heat insulation for the copper sleeve.

[0012] The beneficial effects of this utility model are as follows: This utility model provides a seepage-proof copper-oxygen lance sleeve for electric arc furnace smelting. By adding a layer of refractory material sleeve to the outside of the front end of a traditional copper cooling sleeve and optimizing the internal cooling water circuit design, it brings significant technical advantages: First, the refractory sleeve acts as a heat insulation barrier, effectively reducing the furnace environment temperature directly contacted by the copper sleeve in its enclosed area. Even if the cooling water system malfunctions, it can slow down the heating rate of the copper sleeve, providing a valuable time window for fault detection and handling, and significantly reducing the risk of instantaneous melt-through. This completely blocks the path of abnormal copper melting into the molten steel, fundamentally avoiding accidents caused by excessive copper content in the entire furnace of high-purity molten steel, ensuring production stability and economic benefits. Simultaneously, the structure is compact and reasonable, the cooling water flow channel design ensures uniform and efficient cooling, and the connection between the refractory sleeve and the copper sleeve is reliable, easy to manufacture and maintain, and has high practical value. 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 structure of this utility model from another angle;

[0015] Figure 3 This is a front view of the present utility model;

[0016] Figure 4 This is a top view of the present invention;

[0017] Figure 5 This is a side view of the present invention;

[0018] Figure 6 This utility model Figure 5 Sectional view of plane AA;

[0019] Figure 7 This utility model Figure 6 Sectional view of the middle BB plane;

[0020] Figure 8 This utility model Figure 6 Sectional view of the C-plane;

[0021] As shown in the figure:

[0022] 1. Copper sleeve, 2. Refractory sleeve, 3. Mounting plate, 4. Connecting plate, 5. Inlet pipe, 6. Outlet pipe, 7. Partition, 8. Connecting hole, 9. Refractory mud sealing layer, 10. Annular groove. Detailed Implementation

[0023] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0024] like Figures 1-8 As shown, the present invention provides a seepage-proof copper oxygen lance sleeve for electric arc furnace smelting, comprising a copper sleeve 1 and a refractory sleeve 2 wrapped around the front end of the copper sleeve 1. The copper sleeve 1 is a circular tubular structure, and the oxygen lance passes through the front end of the copper sleeve 1.

[0025] To ensure the oxygen lance is securely mounted on the electric arc furnace, a mounting plate 3 is fixedly attached to the copper sleeve 1. The mounting plate is a circular or elliptical copper plate. The copper sleeve 1 passes through the mounting plate 3 and is welded in place. The mounting plate 3 forms a 45-degree angle with the axis of the copper sleeve 1. Connecting plates 4 are fixedly attached to both sides of the copper sleeve 1 on the mounting plate 3. The connecting plates 4 are perpendicular to the mounting plate 3 and have mounting holes for installation connections.

[0026] The copper sleeve 1 has a double-layer hollow structure. Figure 6 The middle section is a cross-sectional view of the copper sleeve 1. Due to its hollow structure, an annular cavity is formed inside. Two partitions 7 are fixedly connected to the inner cavity of the copper sleeve 1. The partitions 7 are located at the upper and lower ends of the inner cavity of the tube wall, and the length of the partitions 7 is the same as the length of the inner cavity of the tube wall. Therefore, the two partitions 7 divide the inner cavity of the tube wall into two semi-annular cavities. The copper sleeve 1 is connected to an inlet pipe 5 and an outlet pipe 6. The inlet pipe 5 and the outlet pipe 6 are connected to the outer ring of the copper sleeve 1, and the inlet pipe 5 and the outlet pipe 6 are connected to the two semi-annular cavities respectively.

[0027] The partition 7 has a connecting hole 8, which is located at the front end of the partition 7. There are multiple connecting holes 8 arranged in a front-to-back pattern. In this embodiment, the connecting hole 8 is a round hole.

[0028] The refractory sleeve 2 wraps around the outer ring of the front end of the copper sleeve 1, and the length of the portion of the copper sleeve 1 wrapped by the refractory sleeve 2 is 0.5-0.7 times the total length of the copper sleeve 1, so that the portion of the copper sleeve 1 extending into the electric arc furnace is completely wrapped by the refractory sleeve 2. In this embodiment, the refractory sleeve 2 is made of corundum-silicon carbide composite material (Al2O3≥85%, SiC≥10%) and fired into a ring structure, with a temperature resistance >1700℃, an inner diameter of 203±0.5mm, a wall thickness of 10±0.2mm, and an axial length of 300±5mm.

[0029] A refractory mortar sealing layer 9 is provided between the refractory sleeve 2 and the copper sleeve 1. The refractory mortar sealing layer plays a sealing role between the refractory sleeve and the copper sleeve, preventing heat from being transferred to the copper sleeve. In this embodiment, the thickness of the refractory mortar sealing layer is 5-6mm, and the material is phosphate-bonded magnesia refractory mortar (MgO≥80%).

[0030] like Figure 7 , 8 As shown, the front end of the refractory sleeve 2 extends to the front end face of the copper sleeve 1. An annular groove 10 is formed on the inner ring of the front end face of the copper sleeve 1, and the front end of the refractory sleeve 2 extends into the annular groove 10, thereby providing heat insulation for the front end area of ​​the copper sleeve. Even if a small amount of copper sleeve 1 melts, it can prevent the melted copper sleeve from flowing out from the front end of the refractory sleeve.

[0031] How to use this utility model:

[0032] The oxygen lance is inserted into the electric arc furnace through the inner hole of the copper sleeve 1. Cooling water enters the semi-annular cavity on one side through the inlet pipe 5, then enters the other semi-annular cavity through the connecting hole 8 at the front end of the partition 7, and finally exits from the outlet pipe 6, thereby cooling the copper sleeve 1. The refractory sleeve 2 wraps around the front end of the copper sleeve 1, reducing the temperature of the copper sleeve 1. If the cooling water system fails, the copper sleeve 1 will also be difficult to melt quickly.

[0033] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A copper oxygen lance sleeve for arc furnace smelting, characterized in that: It includes a copper sleeve (1) and a fire-resistant sleeve (2) wrapped around the front end of the copper sleeve (1). The wall of the copper sleeve (1) is a double-layer hollow structure. Two partitions (7) are fixed in the inner cavity of the wall of the copper sleeve (1). The two partitions (7) divide the inner cavity of the wall into two semi-annular cavities. A water inlet pipe (5) and a water outlet pipe (6) are connected to the copper sleeve (1). The water inlet pipe (5) and the water outlet pipe (6) are respectively connected to the two semi-annular cavities. A connecting hole (8) is opened on the partition (7).

2. A leak-tight copper oxygen lance sleeve for electric arc furnace smelting according to claim 1, characterized in that: The front end of the refractory sleeve (2) extends to the front end face of the copper sleeve (1).

3. A leak-tight copper oxygen lance sleeve for electric arc furnace smelting according to claim 2, characterized in that: The inner ring of the front end face of the copper sleeve (1) has an annular groove (10), and the front end of the fire-resistant sleeve (2) extends into the annular groove (10).

4. A leak-tight copper oxygen lance sleeve for electric arc furnace smelting according to claim 1, characterized in that: A refractory mud sealing layer (9) is provided between the refractory sleeve (2) and the copper sleeve (1).

5. A leak-tight copper oxygen lance sleeve for electric arc furnace smelting according to claim 1, characterized in that: A mounting plate (3) is fixedly connected to the copper sleeve (1), and a connecting plate (4) located on both sides of the copper sleeve (1) is fixedly connected to the mounting plate (3). The connecting plate (4) has mounting holes.

6. A leak-tight copper oxygen lance sleeve for electric arc furnace smelting according to claim 1, characterized in that: The connecting holes (8) are provided in multiple ways and arranged in a front-to-back pattern.

7. A leak-tight copper oxygen lance sleeve for electric arc furnace smelting according to claim 1, characterized in that: The length of the portion of the refractory sleeve (2) that wraps around the copper sleeve (1) is 0.5-0.7 times the total length of the copper sleeve (1).

Images