Asymmetric flow guide type ceramic-manganese oxide refractory bricks for ladle

Abstract

The utility model provides a kind of asymmetric flow guide type ceramic-manganese dioxide refractory brick for ladle, including refractory brick body, the hot face of refractory brick body uses double curvature composite surface, the upper 1 / 3 area of double curvature composite surface is first curved surface, and the lower 2 / 3 area of double curvature composite surface is second curved surface;Double curvature composite surface is provided with several micro convex flow guide ridges along the refractory brick length direction;The cold face of refractory brick body uses fractal radiating rib structure, and the fractal radiating rib structure includes main rib and secondary rib, and the main rib and secondary rib form tree network structure.The utility model is combined by double curvature composite surface+micro convex flow guide ridge, realizes the impact strengthening and drainage optimization of molten steel impact area, improves the impact and erosion resistance.

Description

Technical Field

[0001] This utility model relates to the field of refractory brick technology, and in particular to an asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles. Background Technology

[0002] The ladle impact zone is a critical area subjected to intense erosion and thermal shock during molten steel injection. Traditional refractory bricks (such as magnesia-carbon bricks and alumina-magnesia-carbon bricks) often employ a rectangular structure. However, this design suffers from eddy erosion; that is, during molten steel impact, eddies easily form in the right-angled areas of the rectangular bricks, exacerbating localized erosion, leading to refractory material spalling and shortening service life. Therefore, a refractory brick that can reduce the intensity of molten steel turbulence and minimize eddy erosion is needed. Summary of the Invention

[0003] To address the above problems, this utility model provides an asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: Asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles includes a refractory brick body. The hot surface of the refractory brick body adopts a double-curvature composite surface. The upper 1 / 3 of the double-curvature composite surface is a first surface, and the lower 2 / 3 of the double-curvature composite surface is a second surface. The double-curvature composite surface is provided with several micro-convex flow-guiding ridges along the length of the refractory brick. The cold surface of the refractory brick body adopts a fractal radial rib structure, which includes main ribs and secondary ribs, and the main ribs and secondary ribs form a tree-like network structure.

[0005] Preferably, the angle between the micro-convex guide ridge and the hyperbolic composite surface is 15°±5°, the height of the micro-convex guide ridge is 2mm, and the distance between adjacent micro-convex guide ridges is 50mm.

[0006] Preferably, the curvature of the first surface is R=80mm±10mm, and the curvature of the second surface is R=180mm±10mm.

[0007] Preferably, the fractal radial rib structure is filled with a gradient porous material between the main ribs and the secondary ribs. The porous material is divided into a near-heated surface layer and a cold surface layer. The near-heated surface layer is mullite with a pore size of 50 μm, and the cold surface layer is alumina fiber felt with a pore size of 200 μm.

[0008] Preferably, the refractory brick body is composed of ceramic-manganese oxide.

[0009] Preferably, the surface of the micro-convex guide ridge is distributed with several tiny pits.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model achieves impact resistance strengthening and flow optimization in the molten steel impact zone by combining a double curvature composite surface and a micro-convex flow guiding ridge, thereby improving impact resistance and erosion resistance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the front structure of the asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles of this utility model; Figure 2 This is a schematic diagram of the back structure of the asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles of this utility model; Labeling explanation: 1-Refractory brick body; 2-Second curved surface; 3-First curved surface; 4-Micro-convex flow guiding ridge; 5-Fractal radial rib structure; 6-Porous material. Detailed Implementation

[0012] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0013] Please refer to the reference. Figure 1 and Figure 2 An embodiment of this utility model discloses an asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles, comprising a refractory brick body. The hot surface of the refractory brick body adopts a double-curvature composite surface. The upper 1 / 3 of the double-curvature composite surface is a first surface, and the lower 2 / 3 of the double-curvature composite surface is a second surface. The double-curvature composite surface is provided with a plurality of micro-convex flow-guiding ridges along the length direction of the refractory brick. This design reduces the flow velocity of molten steel through the first and second surfaces, reduces the formation of turbulence and eddies, and avoids secondary erosion caused by backflow. The micro-convex flow-guiding ridges allow the molten steel to flow in a set direction, reducing the shear corrosion of the brick surface by the molten steel.

[0014] The cold surface of the refractory brick body adopts a fractal radial rib structure, which includes main ribs and secondary ribs, and the main ribs and secondary ribs form a tree-like network structure.

[0015] Preferably, the angle between the micro-convex guide ridge and the hyperbolic composite surface is 15°±5°. The oblique arrangement of the guide ridge promotes heat exchange between the molten steel and the brick surface, avoiding local overheating. The height of the micro-convex guide ridge is 2mm, and the spacing between adjacent micro-convex guide ridges is 50mm. This design, with the 15° oblique arrangement of the guide ridges, forms a "spiral guiding effect," causing the molten steel to flow in a predetermined direction and avoiding disordered turbulence.

[0016] Preferably, the curvature of the first surface is R = 80mm ± 10mm, and the curvature of the second surface is R = 180mm ± 10mm. This design allows for a larger curvature of the first surface (R = 80mm), which, during molten steel impact, distributes the impact force more evenly and reduces localized stress concentration. The smaller curvature of the second surface (R = 180mm) reduces the resistance to molten steel flow, minimizes turbulence and eddy currents, guides the molten steel to flow smoothly along the brick surface, and prevents secondary erosion caused by backflow.

[0017] Preferably, the fractal radial rib structure is filled with a gradient porous material between the main ribs and the secondary ribs. The porous material is divided into a near-heated surface layer and a cold surface layer. The near-heated surface layer is mullite with a pore size of 50 μm, and the cold surface layer is alumina fiber felt with a pore size of 200 μm.

[0018] Preferably, the refractory brick body is composed of ceramic-manganese oxide.

[0019] Preferably, the surface of the micro-convex guiding ridge is distributed with several tiny pits. This design optimizes boundary layer flow through the tiny pits.

[0020] As described above, the present invention relates to an asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles.

[0021] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. An asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles, characterized in that: The refractory brick body (1) is included. The hot surface of the refractory brick body (1) adopts a double curvature composite surface. The upper 1 / 3 of the double curvature composite surface is the first surface (3), and the lower 2 / 3 of the double curvature composite surface is the second surface (2). The double curvature composite surface is provided with several micro-convex flow guiding ridges (4) along the length of the refractory brick. The cold surface of the refractory brick body (1) adopts a fractal radial rib structure (5), which includes main ribs and secondary ribs, and the main ribs and secondary ribs form a tree-like network structure.

2. The asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles as described in claim 1, characterized in that: The angle between the micro-convex guide ridge (4) and the hyperbolic composite surface is 15°±5°, the height of the micro-convex guide ridge (4) is 2mm, and the distance between adjacent micro-convex guide ridges (4) is 50mm.

3. The asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles as described in claim 1, characterized in that: The curvature of the first surface (3) is R=80mm±10mm, and the curvature of the second surface (2) is R=180mm±10mm.

4. The asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles as described in claim 1, characterized in that: The fractal radial rib structure (5) is filled with a gradient porous material (6) between the main ribs and the secondary ribs. The porous material (6) is divided into a near-heated surface layer and a cold surface layer. The near-heated surface layer is mullite with a pore size of 50 μm, and the cold surface layer is alumina fiber felt with a pore size of 200 μm.

5. The asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles as described in claim 1, characterized in that: The refractory brick body (1) is made of ceramic-manganese oxide material.

6. The asymmetric flow-guiding ceramic-manganese oxide refractory brick for steel ladles as described in claim 1, characterized in that: The surface of the micro-convex guiding ridge (4) is distributed with several tiny pits.

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