A molten iron pretreatment stirring device

Abstract

The utility model relates to the technical field of steel smelting equipment, especially relates to a stirring device for molten iron pretreatment, including pretreatment stirring device body, the pretreatment stirring device body includes support platform, the support platform is provided with platform steel beam, the below of platform steel beam is provided with the reducing bushing, the both sides of reducing bushing are provided with the stirring support on platform steel beam, the inside of stirring support is provided with stirring subassembly, the nitrogen seal subassembly is cooperatively provided on stirring subassembly, the nitrogen seal subassembly is cooperatively provided with reducing bushing, the utility model discloses through setting up support platform, platform steel beam, reducing bushing, stirring support and the cooperation of inside stirring subassembly and nitrogen seal subassembly, has realized the efficient pretreatment stirring of molten iron, and the nitrogen seal subassembly is hung below the stirring lifting platform through chain, utilizes the nitrogen gas seal layer formed by the blast hole on nitrogen gas outer ring and inner ring, reduces the environmental pollution, and the quality and efficiency of molten iron pretreatment have been improved.

Description

Technical Field

[0001] This utility model relates to the technical field of iron and steel smelting equipment, and in particular to a stirring device for molten iron pretreatment. Background Technology

[0002] In the steelmaking process, hot metal pretreatment is a crucial step, playing a vital role in improving steel product quality and reducing production costs. However, traditional hot metal pretreatment methods suffer from numerous problems in the stirring stage, severely hindering production efficiency and product quality.

[0003] Previously, the iron pretreatment stirring device had a relatively simple structure and limited function. During the stirring process, it was difficult for the molten iron and the treatment agent to mix fully, resulting in uneven reaction and poor desulfurization and dephosphorization effects, which could not meet the strict requirements of high-quality steel production for the composition of molten iron.

[0004] Meanwhile, the mixing device lacks effective sealing and nitrogen sealing measures. During mixing, molten iron comes into contact with air, which easily leads to oxidation, increasing oxidation losses and potentially introducing impurities that affect the steel's properties. Furthermore, the fumes and dust generated during mixing directly escape into the surrounding environment, causing air pollution, harming the health of operators, and failing to meet increasingly stringent environmental protection requirements.

[0005] In addition, the design of the stirring head and blades in traditional stirring devices is not reasonable, resulting in low stirring efficiency and high energy consumption. Furthermore, the lifting and adjustment of the device is not flexible enough, making it difficult to perform quick and precise operations according to different molten iron processing requirements, which increases the time and labor costs in the production process. Utility Model Content

[0006] To address some of the problems existing in the prior art, this utility model provides a stirring device for molten iron pretreatment. This utility model achieves efficient pretreatment stirring of molten iron by setting up a support platform, platform steel beams, a variable-diameter sleeve, a stirring bracket, and the cooperation of internal stirring components and a nitrogen sealing component. The drive motor of the stirring component drives the stirring shaft and stirring head to rotate via a coupling, and the flow channel design of the stirring blades enhances the stirring effect. The nitrogen sealing component is suspended below the stirring lifting platform by a chain, and a nitrogen sealing layer is formed by the nozzles on the outer and inner rings of the nitrogen gas. Simultaneously, the variable-diameter sleeve cooperates with the flue gas escape zone, and effectively collects flue gas through structures such as the ladle side suction hood and sealing cover, reducing environmental pollution and improving the quality and efficiency of molten iron pretreatment.

[0007] To achieve the above objectives, this utility model provides a stirring device for molten iron pretreatment, comprising a pretreatment stirring device body, the pretreatment stirring device body including a support platform, the support platform being provided with a platform steel beam, a variable diameter sleeve being provided below the platform steel beam, stirring brackets being provided on both sides of the variable diameter sleeve on the platform steel beam, a stirring component being provided inside the stirring bracket, and a nitrogen sealing component being provided on the stirring component, the nitrogen sealing component being provided in conjunction with the variable diameter sleeve.

[0008] As a further improvement of this utility model, to simplify the transmission structure, improve energy transmission efficiency, enable the stirring shaft to be accurately inserted into molten iron, and enhance the flexibility and adaptability of stirring, the stirring assembly includes a drive motor mounted on a stirring support, a coupling for the drive motor, a stirring shaft for the coupling, and the drive motor connected to the stirring shaft via the coupling. The stirring shaft is also equipped with a stirring lifting platform, which runs through the stirring shaft. Movable pulleys are provided on both sides of the stirring lifting platform, allowing the platform to move up and down on the stirring support via the pulleys. The nitrogen sealing assembly is located below the stirring lifting platform.

[0009] As a further improvement of this utility model, in order to ensure that the stirring head can penetrate deep into the molten iron, enhance the circulation of the molten iron, and improve the dispersion uniformity of the reactant, the stirring shaft extends downward through the platform steel beam and the variable diameter sheath. The stirring head is fitted at the lower end of the stirring shaft, and stirring blades are arranged around the stirring head. Several sets of flow channels are arranged on the stirring blades.

[0010] As a further improvement of this utility model, in order to achieve synchronous lifting of the nitrogen sealing device and the stirring assembly to form a stable nitrogen protective layer, a chain is provided below the stirring lifting platform. The stirring lifting platform hoists the nitrogen sealing assembly through the chain. The nitrogen sealing assembly includes an upper cover plate, and a lower sealing opening is provided at the lower end of the upper cover plate. The upper cover plate and the lower sealing opening are arranged in a concentric circle structure. The inner diameter of the upper cover plate is larger than the inner diameter of the lower sealing opening. Nitrogen inlet steel pipes are respectively provided on both sides of the top of the upper cover plate, and several sets of lifting lugs are provided between the nitrogen inlet steel pipes.

[0011] As a further improvement of this utility model, in order to ensure the sealing of the connection parts, prevent nitrogen leakage, ensure the nitrogen sealing effect, avoid mutual interference between the two steel pipes, and ensure the stability and uniformity of the nitrogen inlet process, the upper cover plate is provided with a nitrogen outer ring, the lower seal is provided with a nitrogen inner ring, and the nitrogen outer ring and the nitrogen inner ring are provided with an isolation plate to isolate the two nitrogen inlet steel pipes. The nitrogen outer ring is provided with an outer nitrogen spray hole, and the nitrogen inner ring is provided with an inner nitrogen spray hole.

[0012] As a further improvement of this utility model, in order to promptly remove the smoke and dust in the flue gas escape zone and process it through the suction system, further reducing smoke and dust emissions, expanding the smoke and dust collection range, and effectively collecting smoke and dust escaping from the side of the ladle, thereby improving the overall device's ability to collect and process smoke and dust, a flue gas escape zone is provided below the variable diameter sleeve. The flue gas escape zone includes a ladle side suction hood arranged around the variable diameter sleeve. A sealing cover is provided between the flue gas escape zone and the variable diameter sleeve. A docking hole is provided in the center of the sealing cover, which is connected to the variable diameter sleeve. A desulfurizing agent discharge port and a suction port are respectively provided on both sides of the docking hole. The suction port is welded to an external suction branch pipe.

[0013] In operation, the device is first installed in a suitable position, with the support platform providing stable support via platform steel beams. The variable-diameter sheath is located below the platform steel beams, and the two side mixing supports are fixed to the platform steel beams, providing a mounting base for the mixing components.

[0014] The stirring assembly starts working, the drive motor starts, and the stirring shaft rotates through the coupling. The stirring shaft extends downward through the platform steel beam and the variable diameter sleeve, and the stirring head and stirring blades at its lower end rotate accordingly to stir the molten iron. The flow channels on the stirring blades can optimize the stirring effect, so that the molten iron and the desulfurizing agent can be fully mixed and reacted.

[0015] During the mixing process, the mixing lifting platform moves on the mixing support via pulleys to adjust the position of the mixing shaft and mixing head to adapt to different working conditions. Simultaneously, a nitrogen sealing assembly is hoisted below the mixing lifting platform via chains. The upper cover plate and lower seal of the nitrogen sealing assembly are concentric circles. Nitrogen gas is introduced into the upper cover plate through the nitrogen inlet steel pipe. The nitrogen gas is ejected through the outer nitrogen nozzle of the outer ring and the inner nitrogen nozzle of the inner ring, forming a nitrogen-sealed environment within the variable-diameter sleeve. When the mixing head descends into the ladle to agitate the molten steel, the high temperature of the molten steel agitates a large amount of high-temperature dust, which is then suppressed by the nitrogen seal in the flue gas escape zone and ultimately sucked into the ladle side suction hood. A partition plate separates the two nitrogen inlet steel pipes to ensure a stable nitrogen supply.

[0016] Below the reducing sleeve is the flue gas escaping area. The ladle side suction hood is set around the perimeter. The sealing cover is connected to the reducing sleeve through the central docking hole. The desulfurizing agent is added from the desulfurizing agent discharge port. The flue gas generated by the reaction with the molten iron is drawn into the external suction branch pipe through the suction port.

[0017] The beneficial effects of this utility model are as follows:

[0018] Stable support and rational layout: The structural design of the support platform, combined with the platform steel beams, provides a solid and stable foundation for the entire mixing unit, ensuring its stability during molten iron pretreatment and reducing safety risks and equipment damage caused by vibration or swaying. The rational layout of the variable-diameter sleeve and mixing support on the platform steel beams ensures tight connections and precise positioning between components, guaranteeing the overall structural strength of the unit while facilitating subsequent installation, commissioning, and maintenance, thus improving the reliability and service life of the unit.

[0019] Highly efficient and uniform mixing: In the stirring assembly, the drive motor directly rotates the stirring shaft via a coupling, ensuring efficient and stable power transmission and reducing energy loss. The stirring head and impeller with flow channels at the lower end of the stirring shaft generate strong eddies and shear forces in the molten iron, allowing the desulfurizing agent and other reactants to fully contact and mix rapidly with the molten iron. This significantly improves the reaction speed and uniformity of the molten iron pretreatment, effectively enhancing the desulfurization and dephosphorization effects, thereby obtaining higher quality molten iron.

[0020] Nitrogen sealing design for effective flue gas collection: The ingenious combination of the nitrogen sealing components and the variable diameter sleeve, through the structural design of the upper cover plate, lower seal, and nitrogen outer and inner rings, forms a multi-layered nitrogen sealing environment. Nitrogen enters from the nitrogen inlet steel pipe and is ejected through the outer and inner nitrogen nozzles, forming a stable nitrogen protective layer on the surface of the molten iron and inside the variable diameter sleeve. When the stirring head descends into the ladle to stir the molten steel, the high temperature of the molten steel agitates a large amount of high-temperature dust that rises upwards. This dust is then suppressed by the nitrogen seal in the flue gas escape zone and ultimately sucked into the ladle side suction hood. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 This is a structural diagram of the present invention.

[0023] Figure 2 This is a structural diagram of the present invention during stirring.

[0024] Figure 3 This is a structural diagram of the stirring blade.

[0025] Figure 4 This is a structural diagram of the nitrogen-sealing assembly.

[0026] Figure 5 This is a structural diagram of the outer ring of nitrogen.

[0027] Figure 6 This is a structural diagram of the inner ring of nitrogen.

[0028] Figure 7 This is a top view of the flue gas escape zone.

[0029] The components include: 1. Support platform; 2. Platform steel beam; 3. Variable diameter sheath; 4. Mixing bracket; 5. Mixing assembly; 6. Nitrogen sealing assembly; 7. Drive motor; 8. Coupling; 9. Mixing shaft; 10. Mixing lifting platform; 11. Moving pulley; 12. Mixing head; 13. Mixing blade; 14. Flow channel; 15. Chain; 16. Upper cover plate; 17. Lower seal; 18. Nitrogen inlet steel pipe; 19. Lifting lug; 20. Nitrogen outer ring; 21. Nitrogen inner ring; 22. Isolation plate; 23. Outer nitrogen nozzle; 24. Inner nitrogen nozzle; 25. Flue gas escaping zone; 26. Steel ladle side suction hood; 27. Sealing cover plate; 28. Docking hole; 29. ​​Desulfurizing agent discharge port; 30. Air suction port. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions in this application, the following description is provided in conjunction with the appendix. Figure 1-7 The present invention will be further described below. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the protection scope of the present invention.

[0031] like Figure 1-7 The illustrated stirring device for molten iron pretreatment includes a pretreatment stirring device body, which includes a support platform 1. The support platform 1 is provided with a platform steel beam 2. A variable diameter sleeve 3 is provided below the platform steel beam 2. Stirring brackets 4 are provided on both sides of the variable diameter sleeve 3 on the platform steel beam 2. A stirring component 5 is provided inside the stirring bracket 4. A nitrogen sealing component 6 is provided on the stirring component 5. The nitrogen sealing component 6 is provided in conjunction with the variable diameter sleeve 3.

[0032] The stirring assembly 5 includes a drive motor 7 mounted on a stirring support 4. The drive motor 7 is coupled with a coupling 8, and the coupling 8 is coupled with a stirring shaft 9. The drive motor 7 is connected to the stirring shaft 9 via the coupling 8. The stirring shaft 9 is also coupled with a stirring lifting platform 10, which passes through the stirring shaft 9 and the stirring lifting platform 10. The stirring lifting platform 10 has movable pulleys 11 on both sides, and the stirring lifting platform 10 moves up and down on the stirring support 4 via the movable pulleys 11. The nitrogen sealing assembly 6 is located below the stirring lifting platform 10.

[0033] The stirring shaft 9 extends downward through the platform steel beam 2 and the variable diameter sheath 3. The lower end of the stirring shaft 9 is fitted with a stirring head 12. Stirring blades 13 are arranged around the stirring head 12. Several sets of flow channels 14 are arranged on the stirring blades 13.

[0034] A chain 15 is provided below the mixing lifting platform 10. The mixing lifting platform 10 uses the chain 15 to hoist the nitrogen sealing assembly 6. The nitrogen sealing assembly 6 includes an upper cover plate 16. A lower sealing opening 17 is provided at the lower end of the upper cover plate 16. The upper cover plate 16 and the lower sealing opening 17 are arranged in a concentric circle structure. The inner diameter of the upper cover plate 16 is larger than the inner diameter of the lower sealing opening 17. Nitrogen inlet steel pipes 18 are respectively provided on both sides of the top of the upper cover plate 16. Several sets of lifting lugs 19 are provided between the nitrogen inlet steel pipes 18.

[0035] The upper cover plate 16 is equipped with a nitrogen outer ring 20, and the lower seal 17 is equipped with a nitrogen inner ring 21. The nitrogen outer ring 20 and the nitrogen inner ring 21 are equipped with an isolation plate 22 to isolate the two nitrogen inlet steel pipes 18. The nitrogen outer ring 20 is provided with an outer nitrogen nozzle 23, and the nitrogen inner ring 21 is provided with an inner nitrogen nozzle 24.

[0036] A flue gas escaping zone 25 is provided below the variable diameter sheath 3. The flue gas escaping zone 25 includes a steel ladle side suction hood 26 arranged around the variable diameter sheath 3. A sealing cover plate 27 is provided between the flue gas escaping zone 25 and the variable diameter sheath 3. A docking hole 28 is provided in the center of the sealing cover plate 27, which is connected to the variable diameter sheath 3 through the docking hole 28. A desulfurizing agent discharge port 29 and an air suction port 30 are respectively provided on both sides of the docking hole 28. The air suction port 30 is welded to the external air suction branch pipe.

[0037] In operation, the device is first installed in a suitable position, with the support platform 1 providing stable support via the platform steel beam 2. The variable diameter sheath 3 is located below the platform steel beam 2, and the two side mixing brackets 4 are fixed to the platform steel beam 2, providing an installation foundation for the mixing assembly 5.

[0038] The stirring assembly 5 starts working, the drive motor 7 starts, and drives the stirring shaft 9 to rotate through the coupling 8. The stirring shaft 9 extends downward through the platform steel beam 2 and the variable diameter sleeve 3, and the stirring head 12 and stirring blade 13 at its lower end rotate accordingly to stir the molten iron. The flow channel 14 on the stirring blade 13 can optimize the stirring effect, so that the molten iron and the desulfurizing agent can be fully mixed and reacted.

[0039] During the mixing process, the mixing lifting platform 10 moves on the mixing support 4 via the movable pulley 11, adjusting the position of the mixing shaft 9 and the mixing head 12 to adapt to different working conditions. Simultaneously, the nitrogen sealing assembly 6 is hoisted below the mixing lifting platform 10 via the chain 15. The upper cover plate 16 and lower seal 17 of the nitrogen sealing assembly 6 are concentric circles. Nitrogen gas is introduced into the upper cover plate 16 through the nitrogen inlet steel pipe 18. The nitrogen gas is ejected through the outer nitrogen nozzle 23 of the outer nitrogen ring 20 and the inner nitrogen nozzle 24 of the inner nitrogen ring 21, forming a nitrogen-sealed environment within the variable diameter sleeve 3. When the mixing head 12 descends into the ladle to mix the molten steel, the high temperature of the molten steel agitates a large amount of high-temperature dust that rises upwards. This dust is then sealed and suppressed by the nitrogen gas in the flue gas escape zone 25 and ultimately sucked into the ladle side suction hood 26. The isolation plate 22 isolates the two nitrogen inlet steel pipes 18, ensuring a stable nitrogen supply.

[0040] Below the reducing sleeve 3 is the flue gas escaping area 25. The ladle side suction hood 26 is set around the perimeter. The sealing cover 27 is connected to the reducing sleeve 3 through the central docking hole 28. The desulfurizing agent is added from the desulfurizing agent discharge port 29. The flue gas generated by the reaction with the molten iron is sucked into the external suction branch pipe through the suction port 30.

[0041] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A stirring device for molten iron pretreatment, comprising a pretreatment stirring device body, characterized in that, The pretreatment mixing device body includes a support platform (1), the support platform (1) is provided with a platform steel beam (2), a variable diameter sleeve (3) is provided below the platform steel beam (2), and mixing brackets (4) are provided on both sides of the variable diameter sleeve (3) on the platform steel beam (2). A mixing component (5) is provided inside the mixing bracket (4), and a nitrogen sealing component (6) is provided on the mixing component (5). The nitrogen sealing component (6) is provided in conjunction with the variable diameter sleeve (3).

2. The stirring device for molten iron pretreatment according to claim 1, characterized in that, The stirring assembly (5) includes a drive motor (7) mounted on a stirring support (4). The drive motor (7) is equipped with a coupling (8), and the coupling (8) is equipped with a stirring shaft (9). The drive motor (7) is connected to the stirring shaft (9) via the coupling (8). The stirring shaft (9) is also equipped with a stirring lifting platform (10). The stirring shaft (9) and the stirring lifting platform (10) are connected through each other. The stirring lifting platform (10) is equipped with movable pulleys (11) on both sides. The stirring lifting platform (10) moves up and down on the stirring support (4) via the movable pulleys (11). The nitrogen sealing assembly (6) is located below the stirring lifting platform (10).

3. The stirring device for molten iron pretreatment according to claim 2, characterized in that, The stirring shaft (9) extends downward through the platform steel beam (2) and the variable diameter sleeve (3). The lower end of the stirring shaft (9) is equipped with a stirring head (12). Stirring blades (13) are arranged around the stirring head (12). Several sets of flow channels (14) are arranged on the stirring blades (13).

4. The stirring device for molten iron pretreatment according to claim 2, characterized in that, A chain (15) is provided below the stirring lifting platform (10). The stirring lifting platform (10) hoists the nitrogen sealing assembly (6) through the chain (15). The nitrogen sealing assembly (6) includes an upper cover plate (16). A lower sealing opening (17) is provided at the lower end of the upper cover plate (16). The upper cover plate (16) and the lower sealing opening (17) are arranged in a concentric circle structure. The inner diameter of the upper cover plate (16) is larger than the inner diameter of the lower sealing opening (17). Nitrogen gas inlet steel pipes (18) are respectively provided on both sides of the top of the upper cover plate (16). Several sets of lifting lugs (19) are provided between the nitrogen gas inlet steel pipes (18).

5. The stirring device for molten iron pretreatment according to claim 4, characterized in that, The upper cover plate (16) is equipped with a nitrogen outer ring (20), the lower seal (17) is equipped with a nitrogen inner ring (21), the nitrogen outer ring (20) and the nitrogen outer ring (20) are equipped with an isolation plate (22) to isolate the two nitrogen inlet steel pipes (18), the nitrogen outer ring (20) is equipped with an outer nitrogen nozzle (23), and the nitrogen inner ring (21) is equipped with an inner nitrogen nozzle (24).

6. The stirring device for molten iron pretreatment according to claim 1, characterized in that, A flue gas escaping zone (25) is provided below the variable diameter sheath (3). The flue gas escaping zone (25) includes a steel ladle side suction hood (26) arranged around the variable diameter sheath (3). A sealing cover plate (27) is provided between the flue gas escaping zone (25) and the variable diameter sheath (3). A docking hole (28) is provided in the center of the sealing cover plate (27). The sealing cover plate (27) is connected to the variable diameter sheath (3) through the docking hole (28). A desulfurizing agent discharge port (29) and an air intake port (30) are respectively provided on both sides of the docking hole (28). The air intake port (30) is welded to the external air intake branch pipe.

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