Furnace bottom temperature control system of straight-flow submerged arc furnace

Abstract

The invention relates to the technical field of submerged arc furnaces, in particular to a direct-current submerged arc furnace bottom temperature control system which comprises a furnace shell, and an insulating asbestos board, a high-aluminum aggregate layer, a third-level high-aluminum brick layer, a first-level high-aluminum brick layer, a prebaked carbon brick layer and a clay brick layer are sequentially laid at the inner bottom of the furnace shell from bottom to top. A dry-type sealing ramming material layer is arranged on the inner side of the insulating asbestos plate on the side wall of the furnace shell, a cooling assembly is arranged in the third-stage high-alumina brick layer and comprises an air blower and a plurality of air inlet pipes, air outlet pipes and air conveying pipes, the air outlet pipes are arranged in the third-stage high-alumina brick layer, one ends of the air inlet pipes are inserted into the air outlet pipes and extend to the inner bottoms of the air outlet pipes, and the other ends of the air inlet pipes are connected with the air blower. According to the furnace bottom cooling device, cooling of the furnace bottom of the submerged arc furnace is achieved, the situation that the furnace bottom is heated and cooled rapidly, consequently, prebaked carbon bricks at the furnace bottom warp and the furnace bottom brick floating accidents are caused is avoided, the service life of the submerged arc furnace is prolonged, and the service life of the submerged arc furnace is prolonged. And wide application prospects are achieved in the technical field of submerged arc furnaces.

Description

Technical Field

[0001] This invention relates to the field of submerged arc furnace technology, and in particular to a direct-flow submerged arc furnace bottom temperature control system. Background Technology

[0002] A DC submerged arc furnace is a key piece of equipment used in metal smelting, and its temperature control is crucial for the stability and efficiency of the production process. The design and implementation of the temperature control system directly affect the reduction rate of ore inside the furnace, the metal extraction efficiency, and the overall production cost.

[0003] During the smelting process, molten metal minerals accumulate at the bottom of the furnace, causing the furnace bottom temperature to fluctuate rapidly. This can lead to the lifting of carbon bricks at the furnace bottom, resulting in a brick floating accident that affects the service life of the equipment. If not detected in time, it can cause great safety hazards. Therefore, a device is needed to solve the above problems. Summary of the Invention

[0004] To address the problem that during the smelting process, molten metal minerals accumulate at the bottom of the furnace, causing rapid temperature fluctuations and resulting in the lifting of carbon bricks at the furnace bottom, leading to a brick floating accident that affects the service life of the equipment and poses a significant safety hazard if not detected in time, a direct-flow submerged arc furnace bottom temperature control system has been invented.

[0005] The technical solution of this invention is a DC-type submerged arc furnace bottom temperature control system, including a furnace shell. The inner bottom of the furnace shell is sequentially laid with an insulating asbestos board, a high-alumina aggregate layer, a three-stage high-alumina brick layer, a one-stage high-alumina brick layer, a prebaked carbon brick layer, and a clay brick layer from bottom to top. A dry-sealed ramming material layer is provided inside the insulating asbestos board on the side wall of the furnace shell. A cooling component is provided within the three-stage high-alumina brick layer. The cooling component includes a blower and several inlet pipes, outlet pipes, and conveying pipes. The outlet pipe is located within the three-stage high-alumina brick layer. One end of the inlet pipe is inserted into the outlet pipe and extends to the inner bottom of the outlet pipe. Several inlet pipes on the same side are connected to a single conveying pipe, which is connected to the blower.

[0006] Preferably, the vertical cross-section of the primary high-alumina brick layer and the prebaked carbon brick layer is U-shaped, the inner wall of the primary high-alumina brick layer is provided with silicon carbide cold tamping paste, and carbon casting paste is provided between adjacent prebaked carbon bricks in the prebaked carbon brick layer.

[0007] Preferably, the end face of the third-level high-alumina brick layer near the first-level high-alumina brick layer is provided with several embedded grooves, the air outlet pipe and the air inlet pipe are arranged in the embedded grooves, and the embedded groove outside the air outlet pipe is filled with dry sealing ramming material.

[0008] Preferably, the several air outlet pipes on both sides are arranged opposite each other on the same straight line, and the several air outlet pipes on both sides are arranged symmetrically.

[0009] Preferably, the several air outlet pipes on both sides are arranged in an alternating manner, and the several air outlet pipes on both sides penetrate the bottom of the electric arc furnace.

[0010] Preferably, the several air outlet pipes on both sides are arranged in a U-shape and have only one opening, and the several air outlet pipes on both sides are arranged symmetrically.

[0011] Preferably, each of the air inlet pipes has several connecting rings connected to its outer surface, and each connecting ring has several connecting blocks connected to it. The end face of each connecting block near the air outlet pipe has several rolling grooves, and each rolling groove has a ball bearing. The ball bearing protrudes from the rolling groove and contacts the inner wall of the air outlet pipe.

[0012] Preferably, the connecting ring is connected to several arc-shaped external air guide plates, which are staggered with the connecting block, so that a spiral airflow is formed in the air outlet pipe through the several external air guide plates.

[0013] Preferably, the inner wall of the air inlet duct is connected with several sets of arc-shaped inner air guide plates, so that a spiral airflow is formed in the air inlet duct through the inner air guide plates.

[0014] The technical solution of the present invention can achieve the following beneficial effects: (1) By using insulating asbestos board, high alumina aggregate layer, three-level high alumina brick layer, one-level high alumina brick layer, prebaked carbon brick layer, clay brick layer, and dry sealing ramming material layer, an inner lining of the furnace bottom of the electric arc furnace is formed at the bottom of the furnace shell, so that the molten metal can be received when smelting metal in the electric arc furnace; (2) By using cooling components, the temperature of the furnace bottom of the electric arc furnace can be adjusted to avoid the furnace bottom from rapidly heating or cooling, thereby affecting the stability of the furnace bottom; (3) By using connecting rings, connecting blocks and ball bearings, the air inlet pipe can be quickly inserted and removed in the air outlet pipe, and the air inlet pipe can always be located at the axial position of the air outlet pipe; (4) By using inner air guide plate and outer air guide plate, spiral airflow is formed in the air inlet pipe and air outlet pipe respectively, so that the air can fully contact the inner wall of the air outlet pipe to achieve heat exchange, thereby facilitating the temperature control of the furnace bottom of the electric arc furnace; The technical solution of the present invention has a wide application prospect in the field of electric arc furnace technology. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the DC-type submerged arc furnace bottom temperature control system of the present invention.

[0016] Figure 2 Bit Figure 1 Enlarged view of a portion of region A in the middle.

[0017] Figure 3 The distribution structure 1 of the cooling components in the DC-type submerged arc furnace bottom temperature control system of the present invention is shown in Figure 1.

[0018] Figure 4The distribution structure 2 of the cooling components in the DC-type submerged arc furnace bottom temperature control system of the present invention is shown in Figure 2.

[0019] Figure 5 The distribution structure 3 of the cooling components of the DC-type submerged arc furnace bottom temperature control system of the present invention is shown in the submerged arc furnace.

[0020] Figure 6 This is a partial structural diagram of the cooling component of the DC-type submerged arc furnace bottom temperature control system of the present invention.

[0021] Figure 7 This is a vertical cross-sectional view of the cooling component of the DC-type submerged arc furnace bottom temperature control system of the present invention.

[0022] Figure 8 This is a cross-sectional view of the cooling component of the DC-type submerged arc furnace bottom temperature control system of the present invention.

[0023] Among them, 1. Furnace shell, 2. Insulating asbestos board, 3. High alumina aggregate layer, 4. Dry sealing ramming material layer, 5. Grade III high alumina brick layer, 6. Embedded groove, 7. Air outlet pipe, 8. Air inlet pipe, 9. Dry sealing ramming material, 10. Grade I high alumina brick layer, 11. Prebaked carbon brick layer, 12. Carbon casting paste, 13. Silicon carbide cold ramming paste, 14. Clay brick layer, 15. Air conveying pipe, 16. Connecting ring, 17. Connecting block, 18. Rolling groove, 19. Ball bearing, 20. Outer air guide plate, 21. Inner air guide plate. Detailed Implementation

[0024] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0025] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] This application discloses a DC-type submerged arc furnace bottom temperature control system. (Refer to...) Figure 1 , Figure 2 The furnace shell 1 is provided with an insulating asbestos board 2 on its inner wall. This insulating asbestos board 2 insulates the furnace shell 1 from the interior, preventing leakage of electricity from the furnace to the furnace shell 1 and causing personal injury to the workers. On the insulating asbestos board 2 at the bottom of the furnace shell 1, a high-alumina aggregate layer 3, a third-grade high-alumina brick layer 5, a first-grade high-alumina brick layer 10, a prebaked carbon brick layer 11, and a clay brick layer 14 are laid in sequence. A dry sealing ramming material layer 4 is provided between the third-grade high-alumina brick layer 5, the first-grade high-alumina brick layer 10, the prebaked carbon brick layer 11, and the clay brick layer 14 and the insulating asbestos board 2. The insulating asbestos board 2, the high-alumina aggregate layer 3, the dry sealing ramming material layer 4, the third-grade high-alumina brick layer 5, the first-grade high-alumina brick layer 10, the prebaked carbon brick layer 11, and the clay brick layer 14 together constitute the inner lining of the bottom of the electric arc furnace, forming the inner bottom of the electric arc furnace, thereby enabling the inner bottom of the electric arc furnace to receive the molten metal generated during the smelting process.

[0027] Reference Figure 1 The vertical cross-section of the primary high-alumina brick layer 10 and the prebaked carbon brick layer 11 is U-shaped, which facilitates the reception of molten metal through the U-shaped grooves. The inner sidewall of the primary high-alumina brick layer 10 is provided with silicon carbide cold ramming paste 13, which connects the sidewall of the primary high-alumina brick layer 10 and the prebaked carbon brick layer 11, and protects the entire sidewall of the electric arc furnace, thus better receiving the molten metal inside the furnace. In the prebaked carbon brick layer 11, carbon casting paste 12 is filled between adjacent prebaked carbon bricks, which not only achieves a tight connection between adjacent prebaked carbon bricks but also reserves a certain expansion space, preventing warping and the occurrence of brick floating accidents at the furnace bottom when the prebaked carbon bricks expand due to heat.

[0028] Reference Figure 1 , Figure 2 , Figure 3The high-alumina brick layer 5 is equipped with a cooling component to cool the bottom of the electric arc furnace, preventing the furnace bottom carbon bricks from warping due to rapid temperature changes when receiving molten metal, thus avoiding furnace bottom brick floating accidents and affecting the service life of the equipment. The embedded groove 6 outside the air outlet pipe 7 is filled with dry sealing ramming material 9. The cooling component includes several air inlet pipes 8 and air outlet pipes 7. One end of the air inlet pipe 8 is inserted into the air outlet pipe 7, allowing cooler air to be supplied to the air outlet pipe 7. As the air passes through the air outlet pipe 7, it absorbs the heat transferred from the furnace bottom and is then discharged from the furnace, thereby reducing the temperature of the furnace bottom. An embedded groove 6 is formed on the end face of the high-alumina brick layer 5 near the prebaked carbon brick layer 11. The air outlet pipe 7 is placed within the embedded groove 6, facilitating its installation and limiting its position. The embedded groove 6 outside the air outlet duct 7 is filled with dry sealing ramming material 9, which makes it easy to fill the gap between the air outlet duct 7 and the embedded groove 6 with the dry sealing ramming material 9, and prevents the air outlet duct 7 from moving freely in the embedded groove 6.

[0029] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8The three-level high-alumina brick layer 5 is equipped with a cooling component to cool the bottom of the electric arc furnace. This prevents the furnace bottom from warping due to rapid temperature changes when receiving molten metal, thus avoiding a brick-floating accident that could affect the lifespan of the equipment. Specifically, the end face of the three-level high-alumina brick layer 5 near the first-level high-alumina brick layer 10 has several embedded grooves 6. These grooves 6 are evenly arranged in rows within the three-level high-alumina brick layer 5, and the cooling component is partially housed within one of these grooves. This arrangement facilitates the placement of the cooling component and provides constraint. The cooling component includes an inlet pipe 8, an outlet pipe 7, an air conveying pipe 15, and a blower. The outlet pipe 7 is positioned within one of the embedded grooves 6 in the three-level high-alumina brick layer 5, and the space between the outlet pipe 7 and the embedded groove 6 is filled with dry sealing ramming material 9. This ensures that the outlet pipe 7 is positioned within the embedded groove 6 and prevents it from moving freely within the groove. One end of the air inlet pipe 8 is inserted into the air outlet pipe 7 and extends to the bottom of the air outlet pipe 7, allowing low-temperature cold airflow to be delivered from the air inlet pipe 8 into the air outlet pipe 7. As the airflow exits from the air outlet pipe 7, it absorbs the heat transferred from the furnace bottom, thus cooling the furnace bottom. Several air inlet pipes 8 on the same side are connected to a single air conveying pipe 15, facilitating the simultaneous delivery of cold airflow from one air conveying pipe 15 to several air inlet pipes 8 on the same side, thereby cooling the entire furnace bottom. The air conveying pipe 15 is connected to a blower, allowing cold air to be drawn from the outside by powering on the blower and then delivered to the several air inlet pipes 8 through the air conveying pipe 15. The blower's airflow can be adjusted in real time according to the furnace bottom temperature.

[0030] Reference Figure 3 The two air outlet pipes 7 are arranged opposite each other on the same straight line and are symmetrically arranged to shorten the length of the air outlet pipes 7, so that the cold air transported from the air inlet pipe 8 can be quickly discharged through the air outlet pipes 7, thereby improving the cooling efficiency of the furnace bottom of the electric arc furnace.

[0031] Reference Figure 4 The air outlet pipes 7 on both sides are staggered, and several air outlet pipes 7 on both sides penetrate the bottom of the electric arc furnace, so that each air outlet pipe 7 can penetrate the bottom of the electric arc furnace in a straight line. This allows the airflow delivered from the air inlet pipe 8 to the air outlet pipe 7 to fully absorb the heat emitted from the bottom of the electric arc furnace, thereby carrying out a large amount of heat and cooling the bottom of the electric arc furnace.

[0032] Reference Figure 5Several air outlet pipes 7 on both sides are arranged in a U-shape with only one opening. The symmetrical arrangement of these U-shaped pipes increases their length and the area they cover, allowing the airflow from the inlet pipe 8 to the outlet pipe 7 to fully absorb the heat emitted from the furnace bottom. This enables the removal of a significant amount of heat, thus cooling the furnace bottom. The inlet pipe 8 is a flexible, bendable hose, facilitating its entry and exit from the outlet pipe 7.

[0033] Reference Figure 6 , Figure 7 , Figure 8 Several connecting rings 16 are detachably and fixedly connected to the outside of the air inlet pipe 8 by bolts, so that the connecting rings 16 are connected to the outside of the air inlet pipe 8 and form a whole with the air inlet pipe 8. Each connecting ring 16 is welded or detachably fixedly connected to multiple connecting blocks 17 by bolts. The multiple connecting blocks 17 are evenly connected in a ring on the connecting ring 16, so that the connecting blocks 17 and the connecting ring 16 are connected together to form a whole. Several rolling grooves 18 are opened on the end face of the connecting block 17 near the air outlet pipe 7. Rolling balls 19 are provided in the rolling grooves 18. The rolling balls 19 protrude from the rolling grooves 18 and contact the inner wall of the air outlet pipe 7. This allows the connecting blocks 17 and the rolling balls 19 to limit the distance between the air inlet pipe 8 and the air outlet pipe 7, while facilitating the movement of the air inlet pipe 8 in the air outlet pipe 7 and keeping the air inlet pipe 8 on the axis of the air outlet pipe 7. This ensures that the airflow flows evenly in the air outlet pipe 7, thereby absorbing more heat from the bottom of the electric arc furnace.

[0034] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 Several arc-shaped outer air guide plates 20 are welded to or detachably fixed to the connecting ring 16 by bolts. These outer air guide plates 20 are evenly connected in a ring on the connecting ring 16, forming a single unit. This causes the airflow to change from a direct current to a spiral flow after passing through the outer air guide plates 20, allowing the airflow to fully contact the inner wall of the outlet pipe 7. This enables the airflow to fully absorb heat and expel it outside the electric arc furnace, thus cooling the furnace bottom. The outer air guide plates 20 are staggered from the connecting block 17 to prevent the connecting block 17 from affecting the airflow through the outer air guide plates 20, creating a spiral airflow between the inlet pipe 8 and the outlet pipe 7. Several sets of arc-shaped inner air guide plates 21 are welded to or connected to the inner wall of the inlet pipe 8, creating a spiral airflow within the outlet pipe 8.

[0035] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A DC-type submerged arc furnace bottom temperature control system, comprising a furnace shell (1), wherein, The inner bottom of the furnace shell (1) is laid with an insulating asbestos board (2), a high-alumina aggregate layer (3), a three-level high-alumina brick layer (5), a first-level high-alumina brick layer (10), a prebaked carbon brick layer (11), and a clay brick layer (14) from bottom to top. The inner side of the insulating asbestos board (2) on the side wall of the furnace shell (1) is provided with a dry sealing ramming material layer (4). The three-level high-alumina brick layer (5) is provided with a cooling component, which includes a blower and several air inlet pipes (8), air outlet pipes (7), and air conveying pipes (15). The air outlet pipe (7) is set in the three-level high-alumina brick layer (5). One end of the air inlet pipe (8) is inserted into the air outlet pipe (7) and extends to the inner bottom of the air outlet pipe (7). Several air inlet pipes (8) on the same side are connected to an air conveying pipe (15). The air conveying pipe (15) is connected to the blower.

2. The DC-type submerged arc furnace bottom temperature control system according to claim 1, characterized in that, The vertical cross-section of the first-level high-alumina brick layer (10) and the prebaked carbon brick layer (11) is U-shaped. The inner sidewall of the first-level high-alumina brick layer (10) is provided with silicon carbide cold tamping paste (13), and carbon casting paste (12) is provided between adjacent prebaked carbon bricks of the prebaked carbon brick layer (11).

3. The DC-type submerged arc furnace bottom temperature control system according to claim 1, characterized in that, The third-level high-alumina brick layer (5) has several embedded grooves (6) on the end face near the first-level high-alumina brick layer (10). The air outlet pipe (7) is set in the embedded groove (6). The embedded groove (6) outside the air outlet pipe (7) is filled with dry sealing ramming material (9).

4. The DC-type submerged arc furnace bottom temperature control device according to claim 1, characterized in that, Several air outlet pipes (7) on both sides are arranged opposite each other on the same straight line, and several air outlet pipes (7) on both sides are arranged symmetrically.

5. The DC-type submerged arc furnace bottom temperature control device according to claim 1, characterized in that, Several air outlet pipes (7) on both sides are staggered and penetrate the bottom of the electric arc furnace.

6. The DC-type submerged arc furnace bottom temperature control device according to claim 1, characterized in that, The air outlet pipes (7) on both sides are arranged in a U-shape and have only one opening. The air outlet pipes (7) on both sides are arranged symmetrically.

7. The DC-type submerged arc furnace bottom temperature control device according to claim 1, characterized in that, Each of the air inlet pipes (8) has several connecting rings (16) connected to its outer surface. Each connecting ring (16) has several connecting blocks (17) connected to it. The connecting blocks (17) have several rolling grooves (18) on their end faces near the air outlet pipes (7). Each rolling groove (18) has a ball (19) inside it. The ball (19) protrudes from the rolling groove (18) and contacts the inner wall of the air outlet pipe (7).

8. The DC-type submerged arc furnace bottom temperature control system according to claim 7, characterized in that, The connecting ring (16) is connected to several arc-shaped outer air guide plates (20), and the several outer air guide plates (20) are misaligned with the connecting block (17), so that a spiral airflow is formed in the air outlet pipe (7) through the several outer air guide plates (20).

9. The DC-type submerged arc furnace bottom temperature control system according to claim 1, characterized in that, The inner wall of the air inlet pipe (8) is connected with several sets of arc-shaped inner air guide plates (21), so that a spiral airflow is formed in the air inlet pipe (8) through the inner air guide plates (21).

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