An electric arc furnace lining brick provided with cooling channels

Abstract

The utility model provides a kind of electric arc furnace lining brick with cooling channel, including brick body, the brick body is equipped with opposite hot face and cold face, the inside of the brick body is equipped with spiral channel and central axis is perpendicular to cold face, the minimum projection radius of spiral channel end close to cold face and more close to hot face projection radius is greater, the both ends of spiral channel are respectively connected with inlet channel tail end and outlet channel head end, the inlet channel head end is located in the middle of cold face, the outlet channel tail end is located in the edge of cold face, the inlet channel head end and outlet channel tail end are equipped with interface.The utility model forms stable axial and radial temperature gradient by spiral channel, greatly reduces thermal stress, greatly improves thermal shock resistance, reduces crack.

Description

Technical Field

[0001] This utility model relates to the field of refractory and heat-insulating materials technology, and in particular to a furnace lining brick for an electric arc furnace with a cooling channel. Background Technology

[0002] Traditional furnace linings undergo drastic rapid heating and cooling during the smelting, tapping, and furnace repair cycles. The uneven expansion and contraction of the material generates enormous internal stress, leading to the initiation, propagation, and eventual spalling of cracks. Summary of the Invention

[0003] To address the above problems, this utility model provides an electric arc furnace lining brick with a cooling channel.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: an electric arc furnace lining brick with a cooling channel, comprising a brick body, wherein the brick body has a hot surface and a cold surface positioned opposite each other, and a spiral channel is provided inside the brick body with its central axis perpendicular to the cold surface. The spiral channel has the smallest projection radius at the end closer to the cold surface and the larger projection radius as it gets closer to the hot surface. The two ends of the spiral channel are respectively connected to the tail end of the inlet channel and the head end of the outlet channel. The head end of the inlet channel is located in the middle of the cold surface, and the tail end of the outlet channel is located at the edge of the cold surface. Both the head end of the inlet channel and the tail end of the outlet channel are provided with interfaces.

[0005] Preferably, the spiral channel is connected to the outlet channel and the distance between the spiral channel closest to the hot surface and the hot surface remains unchanged.

[0006] Preferably, the inlet channel is L-shaped, extending first towards the hot side, then bending towards the sidewall of the brick, and connecting to the head end of the spiral channel.

[0007] Preferably, the outlet channel is L-shaped, with the tail end of the spiral channel connected to the outlet channel, then bending towards the side wall of the brick body, and then extending towards the cold side to the cold side.

[0008] Preferably, the interface is a hollow column and is concentrically arranged with the head end of the inlet channel and the tail end of the outlet channel. The inner diameter of the interface is greater than or equal to the inner diameter of the spiral channel. One end of the interface is fixed in the brick body, and the other end extends out of the brick body and is provided with internal threads.

[0009] Preferably, the inner diameters of the spiral channel, the inlet channel, and the outlet channel are all equal, the inner diameter of the spiral channel is 8-15mm, and the pitch of the spiral channel is 30-60mm.

[0010] Preferably, the horizontal distance between the outermost end of the spiral channel and the outer wall of the brick is 30-50mm, the vertical distance between the top end of the spiral channel and the hot surface is 50-80mm, and the vertical distance between the bottom end of the spiral channel and the cold surface is 40-80mm.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model forms a stable radial and axial temperature gradient through a spiral channel, which gradually transfers and reduces the extremely high temperature on the hot surface of the brick, making the temperature gradient from the hot surface to the cold surface inside the brick gentler. This significantly reduces the thermal stress caused by uneven thermal expansion and contraction, significantly inhibits the initiation and propagation of cracks, and improves thermal shock resistance. The spiral channel ensures that the brick can be cooled relatively uniformly in both the radial and axial directions, avoiding the formation of local hot spots and achieving precise, efficient, and uniform cooling. Attached Figure Description

[0012] Figure 1 This is a top sectional view of the electric arc furnace lining brick with cooling channels according to this utility model.

[0013] Figure 2 This is a bottom view of the electric arc furnace lining brick with cooling channels according to this utility model.

[0014] Figure 3 This is a cross-sectional view (AA) of the electric arc furnace lining brick with cooling channels according to this utility model.

[0015] Figure 4 This is a BB cross-sectional view of the electric arc furnace lining brick with cooling channels according to this utility model.

[0016] Attached diagram descriptions: 1. Brick body, 2. Spiral channel, 3. Inlet channel, 4. Outlet channel, 5. Interface, 51. Internal thread, 6. Cold side, 7. Hot side. Detailed Implementation

[0017] 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.

[0018] Please refer to the reference. Figure 1 , Figure 2 , Figure 3 and Figure 4 An embodiment of the present invention provides a furnace lining brick for an electric arc furnace with a cooling channel, comprising a brick body 1, wherein the brick body 1 has a hot surface 7 and a cold surface 6 positioned opposite each other, and a spiral channel 2 is provided inside the brick body 1 with its central axis perpendicular to the cold surface 6. The spiral channel 2 has the smallest projection radius at the end closer to the cold surface 6 and the larger projection radius as it gets closer to the hot surface 7. The two ends of the spiral channel 2 are respectively connected to the tail end of an inlet channel 3 and the head end of an outlet channel 4. The head end of the inlet channel 3 is located in the middle of the cold surface 6, and the tail end of the outlet channel 4 is located at the edge of the cold surface 6. Both the head end of the inlet channel 3 and the tail end of the outlet channel 4 are provided with an interface 5.

[0019] The spiral channel 2 forms a stable radial and axial temperature gradient, gradually transferring and reducing the extremely high temperature of the hot surface 7 of the brick 1, avoiding the formation of local hot spots, and making the temperature gradient from the hot surface 7 to the cold surface 6 inside the brick 1 gentler. This significantly reduces the thermal stress caused by uneven thermal expansion and contraction, significantly inhibits the initiation and propagation of cracks, and improves thermal shock resistance. The inlet channel 3 and outlet channel 4 are used to connect the spiral channel 2 to facilitate the flow of cooling medium. The interfaces 5 at the head end of the inlet channel 3 and the tail end of the outlet channel 4 are both located on the cold surface 6, which facilitates installation, maintenance and insulation layer construction, and also minimizes damage to the integrity of the refractory material on the hot surface 7.

[0020] In one embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, the spiral channel 2 is connected to the outlet channel 4, and the distance between the spiral channel 2 closest to the hot surface 7 and the hot surface 7 remains unchanged, ensuring uniform cooling.

[0021] In one embodiment, such as Figure 3 As shown, the inlet channel 3 is L-shaped. The inlet channel 3 first extends to the hot surface 7, then bends towards the side wall of the brick body 1, and connects to the head end of the spiral channel 2, ensuring a smooth connection between the inlet channel 3 and the spiral channel 2.

[0022] In one embodiment, such as Figure 4 As shown, the outlet channel 4 is L-shaped. The tail end of the spiral channel 2 is connected to the outlet channel 4, then bends towards the side wall of the brick body 1, and then extends towards the cold surface 6 to the cold surface 6, avoiding the complex outlet channel 4 and eliminating the possible local heat exchange between the outlet medium and the inlet medium.

[0023] In one embodiment, such as Figure 2 and Figure 3 As shown, the interface 5 is a hollow column and is concentrically set with the head end of the inlet channel 3 and the tail end of the outlet channel 4. The inner diameter of the interface 5 is greater than or equal to the inner diameter of the spiral channel 2. One end of the interface 5 is fixed inside the brick body 1, and the other end extends out of the brick body 1 and is provided with an internal thread 51. The internal thread 51 facilitates the connection of the cooling medium pipeline and ensures complete sealing.

[0024] In one embodiment, such as Figure 2 , Figure 3 and Figure 4As shown, the inner diameters of the spiral channel 2, inlet channel 3, and outlet channel 4 are all equal, which facilitates the stable flow of the cooling medium. The inner diameter of the spiral channel 2 is 8-15mm, preferably 10mm, to avoid excessive flow resistance due to a small diameter, which would require extremely high pump pressure and cause blockage. Conversely, an excessively large diameter would severely weaken the strength of the brick and require a larger flow rate to achieve the same flow velocity. The pitch of the spiral channel 2 is 30-60mm, preferably 40mm, which provides sufficient cooling coverage while ensuring the strength of the brick 1.

[0025] In one embodiment, such as Figure 2 , Figure 3 and Figure 4 As shown, the horizontal distance between the outermost end of the spiral channel 2 and the outer wall of the brick body 1 is 30-50mm, preferably 35mm, to ensure good cooling effect and prevent edge cracking and leakage of cooling medium. The vertical distance between the top end of the spiral channel 2 and the hot surface 7 is 50-80mm, preferably 60mm, to avoid the refractory material thickness being too low, resulting in weak resistance to chemical erosion and mechanical scouring by slag and molten steel, and to ensure that the hot surface 7 is maintained at a suitable working temperature. The vertical distance between the bottom end of the spiral channel 2 and the cold surface 6 is 40-80mm, preferably 60mm, to ensure sufficient mechanical strength to withstand the masonry pressure and thermal expansion stress, while preventing the furnace shell from overheating, playing a certain heat preservation role, and improving thermal efficiency.

[0026] Usage: Combine Figures 1-4 As shown, the cooling medium flows in from the interface 5 of the inlet channel 3, is guided by the inlet channel 3, enters the head end of the spiral channel 2, and flows from the inside to the outside and from the bottom to the top in the spiral channel 2. After fully absorbing heat, it reaches the tail end of the spiral channel and then flows out from the interface 5 of the outlet channel 4.

[0027] 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. A furnace lining brick for an electric arc furnace with cooling channels, characterized in that: The system includes a brick body (1), which has a hot surface (7) and a cold surface (6) that are opposite to each other. The brick body (1) has a spiral channel (2) inside and its central axis is perpendicular to the cold surface (6). The spiral channel (2) has the smallest projection radius near the cold surface (6) and the larger projection radius is closer to the hot surface (7). The two ends of the spiral channel (2) are connected to the tail end of the inlet channel (3) and the head end of the outlet channel (4), respectively. The head end of the inlet channel (3) is located in the middle of the cold surface (6), and the tail end of the outlet channel (4) is located at the edge of the cold surface (6). Both the head end of the inlet channel (3) and the tail end of the outlet channel (4) are provided with interfaces (5).

2. The electric arc furnace lining brick with cooling channels as described in claim 1, characterized in that: The spiral channel (2) is connected to the outlet channel (4), and the distance between the loop closest to the hot surface (7) and the hot surface (7) remains unchanged.

3. The electric arc furnace lining brick with cooling channels as described in claim 1, characterized in that: The inlet channel (3) is L-shaped. The inlet channel (3) first extends to the hot surface (7) side, then bends to the side wall of the brick body (1), and connects to the head end of the spiral channel (2).

4. The electric arc furnace lining brick with cooling channels as described in claim 1, characterized in that: The outlet channel (4) is "L" shaped. The tail end of the spiral channel (2) is connected to the outlet channel (4), then bends towards the side wall of the brick body (1), and then extends towards the cold surface (6) to the cold surface (6).

5. The electric arc furnace lining brick with cooling channels as described in claim 1, characterized in that: The interface (5) is a hollow column and is concentrically set with the head end of the inlet channel (3) and the tail end of the outlet channel (4). The inner diameter of the interface (5) is greater than or equal to the inner diameter of the spiral channel (2). One end of the interface (5) is fixed inside the brick body (1), and the other end extends out of the brick body (1) and is provided with an internal thread (51).

6. The electric arc furnace lining brick with cooling channels as described in claim 1, characterized in that: The inner diameters of the spiral channel (2), inlet channel (3) and outlet channel (4) are all equal. The inner diameter of the spiral channel (2) is 8-15mm, and the pitch of the spiral channel (2) is 30-60mm.

7. The electric arc furnace lining brick with cooling channels as described in claim 1, characterized in that: The horizontal distance between the outermost end of the spiral channel (2) and the outer wall of the brick (1) is 30-50mm, the vertical distance between the top end of the spiral channel (2) and the hot surface (7) is 50-80mm, and the vertical distance between the bottom end of the spiral channel (2) and the cold surface (6) is 40-80mm.

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