Air injection structure for blanking air seal system

Abstract

The utility model discloses an air injection structure for a blanking air seal system, which comprises an inner pipe, a sleeve sleeved outside the inner pipe, a top opening of the inner pipe extending out of the sleeve, an annular space formed between the sleeve and the inner pipe, a top plate arranged at the top of the annular space, an annular inner cavity formed by the top plate, the outer wall of the inner pipe and the inner wall of the sleeve, and an outer arc plate connected below the sleeve. The outer arc plate is of a big-end-up circular truncated cone structure, the lower portion of the outer arc plate is connected with the discharging sleeve, and the discharging sleeve is connected with the discharging pipe. A through hole is formed in one radial end of the sleeve and connected with a reducing head, a fan is injected into the reducing head to guide airflow of the fan into the annular inner cavity, the reducing head is connected with an elastic hose, the elastic hose is connected with a reducing pipe, and the reducing pipe is connected with the fan. The utility model solves the problem that the air seal pipeline is easily blocked due to the fact that the air seal pipeline is directly welded on the side surface of the blanking pipe.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical electric furnace air seal systems, and particularly relates to an air injection structure for a blanking air seal system. Background Art

[0002] During the smelting process of submerged arc furnaces such as ferroalloys, a large amount of flue gas is generated inside the electric furnace hood. Most of the flue gas is discharged through the flue at the top of the hood and enters the dust collector. After the flue gas is filtered, it is discharged into the atmosphere. There is a blanking air seal system pipeline inside the hood, which mainly injects air by directly inserting a pipeline into the blanking pipeline. The air source is blown into the pipeline by a draft fan, and then directly enters the blanking pipe through the pipeline, and finally reaches the inside of the smelting electric furnace, so that the flue gas generated during the production process of the electric furnace will not be discharged from the blanking pipe and pollute the air.

[0003] The existing air injection structure is generally formed by welding multiple layers of arc plates and upper and lower closing plates into a cylindrical structure. An air injection vent pipe is welded on the outside of the cylindrical structure and is connected to the draft fan. Each component in the existing air injection structure is formed into a whole by welding rolled steel plates / round pipes and rib plates. After welding and forming, stress relief annealing is carried out. However, the air seal of the conventional blanking pipe is a single pipeline directly welded to the side of the blanking pipe, and a small amount of raw materials will enter the air seal pipeline, causing pipeline blockage and poor air circulation, resulting in an unsatisfactory air seal effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an air injection structure for a blanking air seal system, which solves the problem that the air seal pipeline is directly welded to the side of the blanking pipe, which is prone to cause blockage of the air seal pipeline.

[0005] The technical solution adopted by the utility model is that the air injection structure for the blanking air seal system includes an inner pipe, a sleeve is sleeved outside the inner pipe, the top opening of the inner pipe extends out of the sleeve, an annular space is formed between the sleeve and the inner pipe, a top plate is arranged at the top of the annular space, and an annular inner cavity is formed between the top plate and the outer wall of the inner pipe and the inner wall of the sleeve. An outer arc plate is connected below the sleeve, the outer arc plate is in a frustum structure with a large top and a small bottom, a blanking sleeve is connected below the outer arc plate, and the blanking sleeve is connected to the blanking pipe; a through hole is opened at one radial end of the sleeve, the through hole is connected to a reducing head, the draft fan injects air into the reducing head to introduce the draft fan air flow into the annular inner cavity, the reducing head is connected to an elastic hose, the elastic hose is connected to a reducing pipe, and the reducing pipe is connected to the draft fan.

[0006] The characteristics of the utility model also lie in that

[0007] The inner tube extends into the interior of the outer arc plate. A number of partition plates are provided at the bottom edge of the sleeve. The number of partition plates are evenly arranged around the axial direction of the sleeve inward. The extending direction of the partition plates is perpendicular to the axial direction of the sleeve. The edges of the number of partition plates are connected to the inner arc plate. The inner arc plate has a frustum structure with a larger upper part and a smaller lower part. The inner arc plate sleeves the inner tube. There is a gap between the inner arc plate and the bottom of the inner tube. A number of rib plates are evenly arranged circumferentially on the outer wall of the inner arc plate. The rib plates are vertically arranged at the bottom of the partition plates. The rib plates are connected to the sleeve.

[0008] The reducer head and the flexible hose are connected in the form of a clamp.

[0009] The reducer pipe adopts a structure of a large circle at the top and a square at the bottom. The inlet of the reducer pipe is connected to the induced draft fan. A valve is arranged at the outlet position of the reducer pipe. The valve controls and regulates the size of the air injection volume, as well as the opening and closing of the entire air injection pipeline.

[0010] A connecting flange corresponding to the size is welded at the bottom of the blanking sleeve. The connecting flange is butted against the blanking pipe of the electric furnace blanking system through bolts.

[0011] Both the inner tube and the sleeve are cylindrical structures formed by rolling and welding a whole piece of steel plate.

[0012] The beneficial effects of the present utility model are: The present utility model is used for the air injection structure of the blanking air seal system, replaces the traditional horizontal direct connection type air seal system in the submerged arc furnace, changes the air seal structure of the blanking pipe. When the air seal pipeline in the blanking system is blanking, the air seal pipe orifice is not blocked by raw materials, ensuring the smooth air injection into the blanking pipe, achieving the blowing and pressing of the high-temperature flue gas in the pipeline, and reducing the furnace shutdown and maintenance time during the entire electric furnace production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the air injection structure of the present utility model for the blanking air seal system;

[0014] Figure 2 is a top view of the air injection structure of the present utility model for the blanking air seal system;

[0015] Figure 3 is an assembly schematic diagram of the air injection structure of the present utility model for the blanking air seal system.

[0016] In the figure, 1. inner tube, 2. top plate, 3. sleeve, 4. partition plate, 5. rib plate, 6. inner arc plate, 7. outer arc plate, 8. blanking sleeve, 9. flange, 10. reducer head, 11. flexible hose, 12. valve, 13. reducer pipe, 14. fan, 15. bolt, 16. blanking pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be described in detail below in conjunction with the drawings and specific embodiments.

[0018] Embodiment 1

[0019] The utility model relates to an air injection structure for a blanking air seal system, such as Figure 1 shown, which includes an inner pipe 1. A sleeve 3 is sleeved outside the inner pipe 1. The top of the inner pipe 1 opens and extends out of the sleeve 3. An annular space is formed between the sleeve 3 and the inner pipe 1. A top plate 2 is arranged at the top of the annular space. An annular inner cavity is formed between the outer wall of the inner pipe 1, the inner wall of the sleeve 3 and the top plate 2. An outer arc plate 7 is connected below the sleeve 3. The outer arc plate 7 has a frustum structure with a larger upper part and a smaller lower part. A blanking sleeve 8 is connected below the outer arc plate 7. The blanking sleeve 8 is connected to a blanking pipe 16; as Figure 2 and Figure 3 shown, a through hole is opened at one radial end of the sleeve 3. A reducer head 10 is connected to the through hole. The reducer head 10 guides the air flow of the fan into the annular inner cavity. The reducer head 10 is connected to an elastic hose 11. The elastic hose 11 is connected to a reducer pipe 13. The reducer pipe 13 is connected to a fan 14.

[0020] Embodiment 2

[0021] The inner pipe 1 extends into the inner part of the outer arc plate 7. A plurality of partition plates 4 are arranged at the bottom edge of the sleeve 3. The plurality of partition plates 4 are uniformly arranged around the axis of the sleeve 3 in an inward direction. The extending direction of the partition plates 4 is perpendicular to the axis of the sleeve 3. The edges of the plurality of partition plates 4 are connected to an inner arc plate 6. The inner arc plate 6 has a frustum structure with a larger upper part and a smaller lower part. The inner arc plate 6 is sleeved on the inner pipe 1. A gap is left between the inner arc plate 6 and the bottom of the inner pipe 1. A plurality of rib plates 5 are uniformly arranged circumferentially on the outer wall of the inner arc plate 6. The rib plates 5 are vertically arranged at the bottom of the partition plates 4. The rib plates 5 are connected to the sleeve 3. The partition plates 4, the rib plates 5, the inner arc plate 6 and the sleeve 3 form a whole. The air flow of the fan 14 is introduced into the annular inner cavity through the sleeve 3. The air flow passes through the partition plates 4, the rib plates 5, the inner arc plate 6 and the outer arc plate 7. The horizontal air flow is guided and blown in the vertical direction, jointly guiding the air flow direction, and ensuring that the air flow in the annular inner cavity is uniformly injected into the blanking sleeve 8.

[0022] Embodiment 3

[0023] The reducer head 10 and the elastic hose 11 are connected in a clamp form. By adopting the clamp connection method, the influence of vibration of the fan 14 on the connection of the blanking pipeline is effectively reduced when the fan 14 vibrates, thereby effectively reducing the furnace shutdown time.

[0024] The elastic hose 11 is connected to the reducer pipe 13. The reducer pipe 13 adopts a structure of a round top and a square bottom. The inlet of the reducer pipe 13 is connected to an induced draft fan 14. A valve 12 is arranged at the outlet position of the reducer pipe 13. The valve 12 controls and adjusts the air injection air volume and the opening and closing of the entire air injection pipeline.

[0025] A connection flange 9 corresponding to the size is welded at the bottom of the blanking sleeve 8. The connection flange 9 is butted against the blanking pipe 16 of the electric furnace blanking system through bolts 15. The flange 9 and the bolts 15 fixedly connect the blanking sleeve 8 and the blanking pipe 16.

[0026] The inner pipe 1 and the sleeve 3 are both cylindrical structures formed by rolling and welding a whole piece of steel plate.

[0027] The outer arc plate 7 and the blanking sleeve 8 are both made of wear-resistant plate material, which can reduce the wear of the inner wall of the pipeline when the raw materials pass through, and increase the service life.

[0028] The reducer head 10 and the reducer pipe 13 are both made of Q235 steel and form a structure with a round top and a square bottom. The structure with a round top and a square bottom is formed by lofting, bending and welding Q235 steel plates with a thickness of 4 mm.

[0029] The working principle of the air injection structure of the blanking air seal system of the present utility model is that air is continuously injected into the sleeve 3 through the fan 14. While changing the horizontal flow direction through the inner pipe 1, the partition plate 4, the rib plate 5 and the inner arc plate 6, the force on the blanking sleeve 8 is increased, so that the raw materials are not easily blocked and accumulated in the blanking pipe 16, ensuring the smooth flow of air injected into the blanking pipe.

[0030] The working process of the air injection structure of the blanking air seal system of the present utility model is as follows: during on-site installation, after the fan 14 is in place, the distance between the fan 14 and the sleeve 3 is measured, and the elastic hose 11 with the corresponding length is intercepted. The blanking sleeve 8 and the blanking pipe 16 are fastened together. The raw materials enter the outer arc plate 7, the blanking sleeve 8 and the blanking pipe 16 vertically in sequence through the inner pipe 1. The air flow in the fan 14 enters the sleeve 3 horizontally, and after being guided by the partition plate 4, the rib plate 5 and the inner arc plate 6, it blows the blanking pipe 16 in a fixed direction and with a stable force, so as to keep the blanking in the blanking pipe 16 smooth and stable.

[0031] The air injection structure of the blanking air seal system of the present utility model uses the inner pipe 1 and the sleeve 3 as double-layer pipes, which provides a reliable path for air injection, effectively prevents raw materials from entering the air pipeline and blocking the air pipeline, and provides convenience for the initial installation and later maintenance. The inner pipe 1 adopts the structure of a pipeline, which is the path of the raw materials for electric furnace smelting, effectively reduces the wear generated when the raw materials pass through the pipeline, provides an effective guarantee for safe production, and extends the service life.

Claims

1. The air injection structure for the blanking air seal system is characterized in that It includes an inner pipe (1), with a sleeve (3) sleeved outside the inner pipe (1). The top opening of the inner pipe (1) extends out of the sleeve (3). An annular space is formed between the sleeve (3) and the inner pipe (1). A top plate (2) is arranged at the top of the annular space. The top plate (2) and the outer wall of the inner pipe (1) and the inner wall of the sleeve (3) form an annular inner cavity. The sleeve (3) is connected to an outer arc plate (7) below. The outer arc plate (7) is in the shape of a frustum with a larger top and a smaller bottom. The outer arc plate (7) is connected to a blanking sleeve (8) below. The blanking sleeve (8) is connected to a blanking pipe (16). A through hole is opened at one radial end of the sleeve (3), and the through hole is connected to a reducer (10). The reducer (10) is connected to a flexible hose (11). The flexible hose (11) is connected to a reducer pipe (13). The reducer pipe (13) is connected to a fan (14).

2. The air injection structure for the blanking air seal system according to claim 1, wherein The inner pipe (1) extends into the inner part of the outer arc plate (7). A number of partition plates (4) are arranged at the bottom edge of the sleeve (3). The number of partition plates (4) is evenly arranged around the axis of the sleeve (3) inward. The extending direction of the partition plates (4) is perpendicular to the axis of the sleeve (3). The edges of the number of partition plates (4) are connected to an inner arc plate (6). The inner arc plate (6) is in the shape of a frustum with a larger top and a smaller bottom. The inner arc plate (6) is sleeved on the inner pipe (1). There is a gap between the inner arc plate (6) and the bottom of the inner pipe (1). A number of rib plates (5) are evenly arranged circumferentially on the outer wall of the inner arc plate (6). The rib plates (5) are vertically arranged at the bottom of the partition plates (4). The rib plates (5) are connected to the sleeve (3).

3. The air injection structure for the blanking air seal system according to claim 2, wherein, The reducer (10) and the flexible hose (11) are connected in the form of a clamp.

4. The air injection structure for the blanking air seal system according to claim 3, wherein, The reducer pipe (13) adopts a structure of a round top and a square bottom. The inlet of the reducer pipe (13) is connected to an induced draft fan (14). A valve (12) is arranged at the outlet position of the reducer pipe (13). The valve (12) controls and adjusts the air injection volume, as well as the opening and closing of the entire air injection pipeline.

5. The air injection structure for the blanking air seal system according to claim 1, wherein, The bottom of the blanking sleeve (8) is welded with a connecting flange (9) of corresponding size. The connecting flange (9) is butt-connected to the blanking pipe (16) of the electric furnace blanking system through bolts (15).

6. The air injection structure for the blanking air seal system according to claim 1, wherein Both the inner pipe (1) and the sleeve (3) are cylindrical structures formed by rolling and welding a whole piece of steel plate.

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