A reinforcing structure of a composite bushing of an electric arc furnace tapping hole

Abstract

The utility model relates to a kind of arc furnace taphole composite bushing reinforcing structure, including tapping furnace tube and refractory brick layer fixed on the circumferential inner wall of tapping furnace tube, reinforcing tube is fixed in refractory brick layer, the circumferential inner wall of reinforcing tube is covered with corundum material layer, annular filling cavity is formed between reinforcing tube and refractory brick layer, cooling pipe group is equipped in filling cavity, the water inlet pipe and water outlet pipe of cooling pipe group are all extended to tapping furnace tube outside, filling cavity is filled with cooling filler, cooling filler wraps the cooling pipe group.The utility model strengthens the structural strength of refractory brick layer by reinforcing tube, prevent the deformation of tapping furnace tube.By corundum material layer, the strength of reinforcing tube is increased, effectively reduce the erosion of high-temperature molten steel to reinforcing tube, improve the structural strength of taphole, ensure the sealing of taphole.

Description

Technical Field

[0001] This utility model relates to the field of electric arc furnace technology, specifically to a composite bushing reinforcement structure for the steel outlet of an electric arc furnace. Background Technology

[0002] In recent years, with the improvement of ultra-high power electric arc furnace smelting technology, the number of smelting furnaces has reached more than 36 heats per day. The tapping spout of the electric arc furnace is usually sealed by a door. However, when the tapping spout is subjected to the scouring of high-temperature molten steel for a long time, the refractory bricks on the inner wall of the tapping spout are eroded, reducing the structural strength of the tapping spout. This can lead to poor sealing between the tapping spout and the door, resulting in molten steel leakage. Another reason is that under the long-term high-temperature environment of the tapping spout, the refractory material at the outlet will generate thermal expansion force, causing the tapping spout to bulge outward and deform, which will also affect the sealing performance of the tapping spout. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a composite bushing reinforcement structure for the steel tapping port of an electric arc furnace, thereby improving the structural strength of the tapping port and ensuring its sealing performance.

[0004] This utility model is achieved through the following technical solution: a composite bushing reinforcement structure for the tapping port of an electric arc furnace, comprising a tapping furnace tube and a refractory brick layer fixed to the circumferential inner wall of the tapping furnace tube, wherein a reinforcement tube is fixed inside the refractory brick layer, and the circumferential inner wall of the reinforcement tube is covered with a corundum material layer.

[0005] This solution strengthens the refractory brick layer by reinforcing the tubes, preventing deformation of the tapping furnace tubes. The corundum layer further enhances the strength of the reinforcing tubes, effectively reducing the erosion caused by high-temperature molten steel, improving the structural strength of the tapping spout, and ensuring its sealing.

[0006] As an optimization, an annular filling cavity is formed between the reinforcing pipe and the refractory brick layer. A cooling pipe assembly is installed within this cavity, with both the inlet and outlet pipes extending to the outside of the tapping furnace tube. The filling cavity is filled with cooling packing material, which encloses the cooling pipe assembly. This optimized solution introduces cooling water into the cooling pipe assembly through the inlet pipe, cooling the packing material through the cooling pipe assembly, and absorbing the heat dissipated by the molten steel through the packing material. This further prevents the refractory brick layer from being baked by high-temperature heat, preventing deformation and further ensuring the sealing effect of the tapping opening.

[0007] As an optimization, the cooling pipe assembly includes multiple annular cooling main pipes evenly distributed along the axial direction of the filling cavity, and cooling branch pipes connecting adjacent annular cooling main pipes. The inlet pipe is connected to the lowermost annular cooling main pipe, and the outlet pipe is connected to the uppermost annular cooling main pipe. This optimized scheme introduces cooling water into the lowermost annular cooling main pipe through the inlet pipe. The cooling water then flows upward through each cooling branch pipe into each annular cooling main pipe, finally exiting from the uppermost annular cooling main pipe, achieving circulating cooling. The uniform distribution of cooling through multiple annular cooling main pipes ensures a uniform temperature distribution in the cooling packing, resulting in better heat absorption.

[0008] As an optimization, adjacent cooling branch pipes are staggered at both ends of the annular cooling main pipe. This optimized scheme ensures that cooling water fills each annular cooling main pipe.

[0009] As an optimization, the cooling filler is made of asbestos cement. This optimized solution uses asbestos cement as the cooling filler, which has excellent heat absorption capacity, allowing for better heat exchange and ensuring effective cooling.

[0010] As an optimization, multiple reinforcing ribs are evenly distributed and fixed to the outer circumferential wall of the reinforced pipe, and these ribs penetrate the refractory brick layer and are fixed to the inner wall of the tapping furnace tube. This optimized design improves the overall structural strength and reduces the linear expansion of the tapping opening at high temperatures by fixing the reinforced pipe to the tapping furnace tube using these reinforcing ribs.

[0011] The beneficial effects of this utility model are as follows: The reinforcing pipe strengthens the structural strength of the refractory brick layer, preventing deformation of the tapping furnace tube. The corundum material layer increases the strength of the reinforcing pipe, effectively reducing the erosion of the reinforcing pipe by high-temperature molten steel, improving the structural strength of the tapping spout, and ensuring the sealing performance at the tapping spout.

[0012] Cooling water is introduced into the cooling pipe assembly through the inlet pipe. The cooling pipe assembly cools the cooling packing and absorbs the heat emitted by the molten steel. This further prevents the high-temperature heat from baking the refractory brick layer, prevents deformation, and further ensures the sealing effect of the steel tapping port. Attached Figure Description

[0013] Figure 1 This is a top sectional view of the present invention;

[0014] Figure 2 This is a front sectional view of the present invention;

[0015] Figure 3 for Figure 2 Enlarged view of part A;

[0016] As shown in the figure:

[0017] 1. Steel tapping furnace tube; 2. Refractory brick layer; 3. Reinforcing pipe; 4. Corundum material layer; 5. Reinforcing rib plate; 6. Filling cavity; 7. Cooling filler; 8. Cooling pipe assembly; 81. Annular cooling main pipe; 82. Cooling branch pipe; 83. Water inlet pipe; 84. Water outlet pipe; 9. Annular sealing plate. Detailed Implementation

[0018] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0019] like Figures 1-3 As shown, a composite bushing reinforcement structure for the tapping port of an electric arc furnace includes a tapping furnace tube 1 and a refractory brick layer 2 fixed to the circumferential inner wall of the tapping furnace tube 1. A reinforcement tube 3 is fixed inside the refractory brick layer 2, and the circumferential inner wall of the reinforcement tube 3 is covered with a corundum material layer 4.

[0020] The inner cavity of the reinforcing tube 3 forms the tapping port of the electric arc furnace. The reinforcing tube 3 strengthens the structural strength of the refractory brick layer 2 and prevents deformation of the tapping furnace tube 1. The corundum material layer 4 increases the inner wall strength of the reinforcing tube 3, effectively reducing the erosion of the reinforcing tube by high-temperature molten steel, improving the structural strength of the tapping port, and ensuring the sealing of the tapping port.

[0021] Specifically, multiple reinforcing ribs 5 are evenly distributed and fixed to the outer wall of the reinforcing pipe 3, and the multiple reinforcing ribs 5 penetrate the refractory brick layer 2 and are fixed to the inner wall of the tapping furnace pipe 1. The reinforcing pipe 3 is fixed to the tapping furnace pipe 1 through the reinforcing ribs 5, which improves the overall structural strength and reduces the linear expansion of the tapping opening under high temperature conditions.

[0022] Specifically, the reinforcing pipe 3 is made of 310S heat-resistant stainless steel with a wall thickness of 8-12mm. The corundum layer 4 is formed by mixing self-flowing corundum material with a particle size ≤0.088mm, aluminum dihydrogen phosphate binder, and water in a mass ratio of 95:2:3. After mixing, the corundum layer 4 is applied to the circumferential inner wall of the reinforcing pipe 3 and dried to form a solid shape. The thickness of the corundum layer 4 is 8-10mm.

[0023] The outer diameter of the reinforcing tube 3 is smaller than the inner diameter of the refractory brick layer 2. An annular filling cavity 6 is formed between the reinforcing tube 3 and the refractory brick layer 2. In this embodiment, the thickness of the filling cavity 6 is the same as the thickness of the refractory brick layer 2 to ensure the cooling and heat absorption effect.

[0024] The filling cavity 6 is equipped with a cooling pipe assembly 8, with both the inlet pipe 83 and the outlet pipe 84 extending to the outside of the tapping furnace tube 1. The filling cavity 6 is filled with cooling filler 7, which surrounds the cooling pipe assembly 8. Cooling water is introduced into the cooling pipe assembly 8 through the inlet pipe 83, cooling the cooling filler 7 through the cooling pipe assembly 8, and absorbing the heat emitted by the molten steel through the cooling filler 7, thereby further preventing the high-temperature heat from baking the refractory brick layer 2, preventing deformation, and further ensuring the sealing effect of the tapping port.

[0025] Specifically, the cooling pipe assembly 8 includes a plurality of annular cooling main pipes 81 evenly distributed along the axial direction of the filling cavity 6, and cooling branch pipes 82 connecting adjacent annular cooling main pipes 81. The water inlet pipe 83 is connected to the lowermost annular cooling main pipe 81, and the water outlet pipe 84 is connected to the uppermost annular cooling main pipe 81.

[0026] In this embodiment, two adjacent annular cooling main pipes 81 are connected by a cooling branch pipe 82. The cooling branch pipe 82 extends vertically, and the two adjacent cooling branch pipes 82 are staggered at both ends of the annular cooling main pipe 81. In use, the inlet pipe 83 can be connected to the output end of an external cooling water source, and the outlet pipe 84 can be connected to the input end of an external cooling water source. Cooling water is introduced into the lowermost annular cooling main pipe 81 through the inlet pipe 83, and the cooling water is injected into each annular cooling main pipe 81 sequentially through each cooling branch pipe 82, and finally discharged from the uppermost annular cooling main pipe 81, realizing circulating cooling. Through the uniform distribution of cooling in multiple annular cooling main pipes 81, the temperature distribution of the cooling packing 7 is uniform, and heat absorption is better.

[0027] Specifically, the cooling filler 7 is asbestos cement. An annular sealing plate 9 is fixedly connected to the lower end of the filling cavity 6, sealing the bottom of the filling cavity 6 to prevent leakage of the cooling filler. After the cooling pipe assembly 8 is installed in the filling cavity 6, the cooling filler 7 is filled into the filling cavity 6 to enclose and fix the cooling pipe assembly 8. The asbestos cement cooling filler 7 has good heat absorption capacity, better facilitating cooling temperature and heat exchange, and ensuring the cooling effect.

[0028] 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 composite bushing reinforcement structure for the tapping outlet of an electric arc furnace, comprising a tapping furnace tube (1) and a refractory brick layer (2) fixed to the circumferential inner wall of the tapping furnace tube (1), characterized in that: The refractory brick layer (2) is internally fitted with a reinforcing tube (3), and the inner circumferential wall of the reinforcing tube (3) is covered with a corundum material layer (4).

2. The composite bushing reinforcement structure for the taphole of an electric arc furnace according to claim 1, characterized in that: An annular filling cavity (6) is formed between the reinforcing pipe (3) and the refractory brick layer (2). A cooling pipe assembly (8) is provided in the filling cavity (6). The water inlet pipe (83) and water outlet pipe (84) of the cooling pipe assembly (8) extend to the outside of the tapping furnace pipe (1). The filling cavity (6) is filled with cooling filler (7), which wraps the cooling pipe assembly (8).

3. The composite bushing reinforcement structure for the taphole of an electric arc furnace according to claim 2, characterized in that: The cooling pipe assembly (8) includes a plurality of annular cooling main pipes (81) evenly distributed along the axial direction of the filling cavity (6), and cooling branch pipes (82) connecting adjacent annular cooling main pipes (81). The water inlet pipe (83) is connected to the lowermost annular cooling main pipe (81), and the water outlet pipe (84) is connected to the uppermost annular cooling main pipe (81).

4. The composite bushing reinforcement structure for the taphole of an electric arc furnace according to claim 3, characterized in that: Two adjacent cooling branch pipes (82) are staggered at both ends of the annular cooling main pipe (81).

5. The composite bushing reinforcement structure for the taphole of an electric arc furnace according to claim 2, characterized in that: The cooling filler (7) is asbestos cement.

6. The composite bushing reinforcement structure for the taphole of an electric arc furnace according to claim 1, characterized in that: The reinforcing tube (3) has multiple reinforcing ribs (5) evenly distributed and fixed on its outer circumferential wall. The multiple reinforcing ribs (5) penetrate the refractory brick layer (2) and are fixed to the inner wall of the steel tapping furnace tube (1).

Images