A smoke treatment device for molten iron stirring

Abstract

The utility model relates to the technical field of steel smelting, especially relates to a molten iron stirring smoke dust treatment device, including smoke dust treatment device body, the smoke dust treatment device body includes support platform, the below of support platform is provided with platform steel beam, the below of platform steel beam is provided with the variable -diameter protection cylinder, the below of variable -diameter protection cylinder is provided with stirring axle hole platform, be provided with smoke gas dissipation area between variable -diameter protection cylinder and stirring axle hole platform, the inside cooperation of variable -diameter protection cylinder is provided with nitrogen seal device, the utility model discloses through setting up variable -diameter protection cylinder, nitrogen seal device and ladle side suction cover etc. Unique structure, the efficient collection and processing of smoke dust in molten iron stirring process are realized. Variable -diameter protection cylinder guides smoke dust flow, and nitrogen seal device effectively insulates air, reduces smoke dust generation, and the ladle side suction cover further captures residual smoke dust, and all-around guarantee the workshop environment clean, reduces pollution.

Description

Technical Field

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

[0002] In the steel smelting process, iron stirring is a crucial step, ensuring the uniform distribution of components in the molten iron, improving its quality, and ultimately guaranteeing the performance of subsequent steel products. However, this stirring process generates a large amount of fumes and dust, which are complex in composition and contain harmful substances such as metal oxides and carbon powder. If not effectively treated, this not only severely pollutes the workshop environment and harms the health of operators, leading to occupational diseases such as respiratory illnesses, but also wastes resources, as some of the metal components in the fumes have recycling value.

[0003] Traditional methods of fume extraction often involve collecting the fumes with simple hoods and then discharging them through pipes to an air purification system. However, this approach has several drawbacks. The hoods cannot completely cover the mixing area, causing some fumes to escape into the surrounding environment. Furthermore, the mixing shaft is a weak point for fume escape during molten iron mixing, and traditional methods cannot effectively address this issue.

[0004] Furthermore, existing dust treatment devices have shortcomings in terms of sealing and nitrogen sealing. Nitrogen sealing is crucial for preventing air from entering the stirring zone, avoiding molten iron oxidation, and controlling dust generation. However, the nitrogen sealing structure of previous devices was unreasonable, and the nitrogen distribution was uneven, failing to form an effective sealing barrier, which greatly reduced the dust treatment effect.

[0005] With increasingly stringent environmental protection requirements and the steel industry's emphasis on clean production, it is urgent to develop a dust treatment device that can effectively handle the dust generated during molten iron stirring, has good sealing performance, and a significant nitrogen sealing effect, in order to achieve green production, reduce the impact on the environment and personnel, and improve resource utilization. Utility Model Content

[0006] To address some of the problems existing in the prior art, this utility model provides a dust treatment device for molten iron stirring. This utility model achieves efficient collection and treatment of dust during molten iron stirring through a unique structure including a variable-diameter protective sleeve, a nitrogen sealing device, and a ladle side suction hood. The variable-diameter protective sleeve guides the flow of dust, the nitrogen sealing device effectively isolates air and reduces dust generation, and the ladle side suction hood further captures residual dust, comprehensively ensuring a clean workshop environment and reducing pollution.

[0007] To achieve the above objectives, this utility model provides a dust treatment device for molten iron stirring, comprising a dust treatment device body, the dust treatment device body including a support platform, a platform steel beam disposed below the support platform, a variable diameter protective sleeve disposed below the platform steel beam, a stirring shaft hole platform disposed below the variable diameter protective sleeve, a flue gas escape zone disposed between the variable diameter protective sleeve and the stirring shaft hole platform, and a nitrogen sealing device disposed inside the variable diameter protective sleeve.

[0008] As a further improvement of this utility model, in order to facilitate the distribution and flow of nitrogen in the device, better form a nitrogen-sealed environment, and ensure the stability and sufficiency of nitrogen supply, the nitrogen sealing device includes an upper cover plate, the lower end of which is provided with a lower sealing opening, 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.

[0009] As a further improvement of this utility model, in order to ensure the sealing of the connection parts, prevent nitrogen leakage, guarantee the nitrogen sealing effect, avoid mutual interference between the two steel pipes, ensure the stability and uniformity of the nitrogen inlet process, and enable the nitrogen to play a more effective role in the device, thereby further enhancing the performance of the nitrogen sealing device, the upper cover plate is equipped with a nitrogen outer ring, and the lower seal is equipped with a nitrogen inner ring. The upper cover plate and the nitrogen outer ring are continuously welded around the entire perimeter, and the lower seal and the nitrogen inner ring are also continuously welded around the entire perimeter. An isolation plate is provided between the nitrogen outer ring and the nitrogen inner ring to isolate the two nitrogen inlet steel pipes.

[0010] As a further improvement of this utility model, in order to enable nitrogen gas to form a certain diffusion angle when it is sprayed from the outer ring, expand the coverage range of nitrogen gas, and better seal the surrounding area, nitrogen gas can be sprayed from different positions and angles to form a multi-layer nitrogen gas sealing barrier, improve the nitrogen sealing effect, and effectively prevent the escape of smoke and dust. The outer ring of nitrogen gas is generally set in a conical structure, and the inner diameter of the top of the outer ring of nitrogen gas is larger than the inner diameter of the bottom of the outer ring of nitrogen gas. The inner ring of nitrogen gas is set in a circular shape. The outer ring of nitrogen gas is provided with an outer nitrogen gas spray hole, and the inner ring of nitrogen gas is provided with an inner nitrogen gas spray hole.

[0011] As a further improvement of this utility model, in order to make the nitrogen injection more uniform and comprehensive, avoid the occurrence of injection dead zones, further enhance the sealing effect of nitrogen inside the device, better suppress the generation and dispersion of smoke and dust, and improve the smoke and dust treatment effect, the outer nitrogen injection holes on the outer ring of the nitrogen are arranged in a single-row structure, and the inner nitrogen injection holes are arranged in a double-row structure, divided into an inner upper nitrogen injection hole and an inner lower nitrogen injection hole, and the inner upper nitrogen injection hole and the inner lower nitrogen injection hole are staggered by 4-6°.

[0012] As a further improvement of this utility model, in order to ensure the relative sealing of the flue gas escaping zone and prevent the flue gas from leaking into the surrounding environment in large quantities before treatment, and to facilitate the subsequent docking with other components, and to ensure the connection and coordinated operation between the various parts of the device, the variable diameter casing is set in a conical structure, and a sealing cover plate is set on the top of the flue gas escaping zone and connected to the variable diameter casing through the sealing cover plate. A docking hole is set in the center of the sealing cover plate.

[0013] As a further improvement of this utility model, in order to promptly remove the smoke and dust in the flue gas emission zone, the system is used for treatment to further reduce smoke and dust emissions, expand the smoke and dust collection range, and effectively collect the smoke and dust escaping from the side of the ladle, thereby improving the overall dust collection and treatment capacity of the device and comprehensively improving the working environment. Desulfurizing agent discharge port and air suction port are respectively provided on both sides of the docking hole. The air suction port is welded to the external air suction branch pipe, and a ladle side suction hood is provided around the flue gas emission zone.

[0014] When this utility model is in operation, the entire dust treatment device body is installed in place, the support platform is stably supported by the platform steel beam, the variable diameter casing and the stirring shaft hole platform are installed in sequence to form an overall frame, and the flue gas dispersion area between the variable diameter casing and the stirring shaft hole platform provides space for dust collection and treatment.

[0015] Next, the nitrogen sealing device is installed. The upper cover plate and the lower seal are placed in a concentric circle structure, with the inner diameter of the upper cover plate being larger than that of the lower seal. The nitrogen inlet steel pipes on both sides of the top are connected to the nitrogen source, and several sets of lifting lugs facilitate hoisting and installation. Subsequently, the outer nitrogen ring is continuously welded to the entire perimeter of the upper cover plate, and the inner nitrogen ring is also continuously welded to the entire perimeter of the lower seal. An isolation plate is installed between the outer nitrogen rings to prevent the two nitrogen inlet steel pipes from interfering with each other.

[0016] After nitrogen enters through the intake steel pipe, the nitrogen outer ring is conical with a large inner diameter at the top and a small inner diameter at the bottom, causing the nitrogen to flow in a specific direction inside and be ejected from the single-row nitrogen nozzle on the outside. The circular structure of the nitrogen inner ring causes the nitrogen to be ejected from the double-row nitrogen nozzle on the inside, with the upper and lower nozzles offset by 5°, forming a multi-layered and uniform nitrogen sealing barrier that effectively suppresses the escape of smoke and dust.

[0017] During the stirring of molten iron, the connecting hole in the center of the sealing cover plate aligns with the stirring shaft, and the desulfurizing agent is introduced into the molten iron through the desulfurizing agent discharge port for desulfurization treatment. The flue gas generated during stirring enters the flue gas escape zone, and the suction system formed by welding the suction port to the external suction branch pipe is activated to draw the flue gas away for treatment. Simultaneously, the side suction hoods of the ladle surrounding the flue gas escape zone further collect the flue gas and dust escaping from the sides, ensuring comprehensive collection and treatment of flue gas and dust, greatly improving the working environment, and guaranteeing safe and efficient production.

[0018] The beneficial effects of this utility model are as follows:

[0019] Sturdy structure and reliable support: The support platform is securely connected to the components below via platform steel beams, providing a solid foundation for the entire unit. The rational layout of the variable-diameter casing and the stirring shaft hole platform ensures stable operation of the unit in complex working environments, reduces structural damage caused by vibration or external forces, and extends the service life of the equipment.

[0020] Highly efficient nitrogen sealing, suppressing escape: The nitrogen sealing device is ingeniously designed with a concentric circle structure for the upper cover and lower sealing opening, and the large inner diameter of the upper cover facilitates uniform nitrogen distribution. The outer ring of nitrogen is conical, and the inner ring is circular. Combined with a single row of outer nitrogen nozzles and a double row of inner nitrogen nozzles staggered by 4-6°, a multi-layered, all-around nitrogen sealing barrier is formed, effectively preventing the upward escape of fumes during molten iron stirring, reducing the pollution of the workshop environment by fumes, and protecting the health of workers.

[0021] Excellent sealing and controllable flue gas: The conical structure of the variable-diameter casing guides the flue gas flow to the flue gas escape zone, and the sealing cover is tightly connected to the variable-diameter casing to ensure a relatively sealed escape zone. The docking hole facilitates the connection of the stirring shaft, the desulfurizing agent discharge port facilitates the addition of desulfurizing agent, and the suction port is welded to the external suction branch pipe, which can promptly remove and treat the flue gas in the escape zone, reducing fugitive emissions.

[0022] Suction hoods assist in comprehensive collection: The side suction hoods around the flue gas emission area can collect the flue gas escaping from the side of the ladle. They complement the air intake to achieve comprehensive collection of flue gas, further improving the efficiency of flue gas treatment and significantly improving the air quality in the workshop, creating favorable environmental conditions for molten iron mixing operations. Attached Figure Description

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings:

[0024] Figure 1 This is a structural diagram of the present invention.

[0025] Figure 2 This is a structural diagram of the stirring shaft hole platform of this utility model.

[0026] Figure 3 This is a top view of the sealing cover plate of this utility model.

[0027] Figure 4 This is a structural diagram of a nitrogen sealing device.

[0028] Figure 5 This is a side view of the nitrogen sealing device.

[0029] Figure 6 This is a bottom structural diagram of the nitrogen sealing device.

[0030] Figure 7 This is a structural diagram of the inner ring.

[0031] The components include: 1. Support platform; 2. Platform steel beam; 3. Variable diameter casing; 4. Stirring shaft hole platform; 5. Flue gas escaping zone; 6. Nitrogen sealing device; 7. Upper cover plate; 8. Lower seal; 9. Nitrogen inlet steel pipe; 10. Lifting lug; 11. Nitrogen outer ring; 12. Nitrogen inner ring; 13. Isolation plate; 14. Outer nitrogen nozzle; 15. Inner nitrogen nozzle; 16. Inner upper nitrogen nozzle; 17. Inner lower nitrogen nozzle; 18. Sealing cover plate; 19. Butt joint hole; 20. Desulfurizing agent discharge port; 21. Air intake port; 22. Steel ladle side suction hood. Detailed Implementation

[0032] 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.

[0033] like Figure 1-7 The illustrated molten iron stirring fume treatment device includes a fume treatment device body, which includes a support platform 1. A platform steel beam 2 is arranged below the support platform 1. A variable diameter protective sleeve 3 is arranged below the platform steel beam 2. A stirring shaft hole platform 4 is arranged below the variable diameter protective sleeve 3. A flue gas escape zone 5 is arranged between the variable diameter protective sleeve 3 and the stirring shaft hole platform 4. A nitrogen sealing device 6 is fitted inside the variable diameter protective sleeve 3.

[0034] The nitrogen sealing device 6 includes an upper cover plate 7, and a lower sealing opening 8 is provided at the lower end of the upper cover plate 7. The upper cover plate 7 and the lower sealing opening 8 are arranged in a concentric circle structure. The inner diameter of the upper cover plate 7 is larger than the inner diameter of the lower sealing opening 8. Nitrogen gas inlet steel pipes 9 are respectively provided on both sides of the top of the upper cover plate 7, and several sets of lifting lugs 10 are provided between the nitrogen gas inlet steel pipes 9.

[0035] The upper cover plate 7 is fitted with a nitrogen outer ring 11, and the lower seal 8 is fitted with a nitrogen inner ring 12. The upper cover plate 7 and the nitrogen outer ring 11 are continuously welded together around their entire perimeter, and the lower seal 8 and the nitrogen inner ring 12 are also continuously welded together around their entire perimeter. The nitrogen outer ring 11 is fitted with an isolation plate 13 to isolate the two nitrogen inlet steel pipes 9.

[0036] The nitrogen outer ring 11 is generally conical in shape, with the top inner diameter of the nitrogen outer ring 11 being larger than the bottom inner diameter of the nitrogen outer ring 11. The nitrogen inner ring 12 is circular in shape. The nitrogen outer ring 11 is provided with an outer nitrogen nozzle 14, and the nitrogen inner ring 12 is provided with an inner nitrogen nozzle 15.

[0037] The outer nitrogen nozzle 14 on the outer nitrogen ring 11 is arranged in a single-row structure, and the inner nitrogen nozzle 15 is arranged in a double-row structure, consisting of an inner upper nitrogen nozzle 16 and an inner lower nitrogen nozzle 17. The inner upper nitrogen nozzle 16 and the inner lower nitrogen nozzle 17 are staggered by 4-6°.

[0038] The variable diameter casing 3 is arranged in a conical structure. The top of the flue gas escaping zone 5 is provided with a sealing cover plate 18, which is connected to the variable diameter casing 3. The sealing cover plate 18 is provided with a docking hole 19 in the center.

[0039] The two sides of the docking hole 19 are respectively provided with a desulfurizing agent discharge port 20 and a suction port 21. The suction port 21 is welded to the external suction branch pipe. The flue gas escaping area 5 is surrounded by a steel ladle side suction hood 22.

[0040] When this utility model is in operation, the entire dust treatment device body is installed in place, the support platform 1 is stably supported by the platform steel beam 2, the variable diameter protective cylinder 3 and the stirring shaft hole platform 4 are installed in sequence to form an overall frame, and the flue gas emission zone 5 between the variable diameter protective cylinder 3 and the stirring shaft hole platform 4 provides space for dust collection and treatment.

[0041] Next, the nitrogen sealing device 6 is installed. The upper cover plate 7 and the lower sealing port 8 are placed in a concentric circle structure, with the inner diameter of the upper cover plate 7 being larger than that of the lower sealing port 8. The nitrogen inlet steel pipes 9 on both sides of its top are connected to the nitrogen source. Several sets of lifting lugs 10 facilitate hoisting and installation. Subsequently, the nitrogen outer ring 11 is continuously welded to the entire perimeter of the upper cover plate 7, and the nitrogen inner ring 12 is also continuously welded to the entire perimeter of the lower sealing port 8. An isolation plate 13 is installed between the nitrogen outer rings 11 to prevent the two nitrogen inlet steel pipes 9 from interfering with each other.

[0042] After nitrogen enters through the intake steel pipe, the nitrogen outer ring 11 is conical with a large inner diameter at the top and a small inner diameter at the bottom, causing the nitrogen to flow in a specific direction inside and be ejected from the single-row outlet of the outer nitrogen nozzle 14. The circular structure of the inner nitrogen ring 12 causes the nitrogen to be ejected from the double-row outlets of the inner nitrogen upper nozzle 16 and the inner nitrogen lower nozzle 17, with the upper and lower nozzles staggered by 5°, forming a multi-layered and uniform nitrogen sealing barrier that effectively suppresses the escape of smoke and dust.

[0043] During the stirring of molten iron, the mating hole 19 in the center of the sealing cover plate 18 connects with the stirring shaft, and the desulfurizing agent is added to the molten iron through the desulfurizing agent discharge port 20 for desulfurization treatment. The flue gas generated by stirring enters the flue gas emission zone 5, and the suction system formed by welding the suction port 21 to the external suction branch pipe is activated to draw away and treat the flue gas. At the same time, the side suction hoods 22 of the ladle around the flue gas emission zone 5 further collect the flue gas dust from the sides, ensuring comprehensive collection and treatment of flue gas dust, greatly improving the working environment, and ensuring safe and efficient production.

[0044] 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 fume treatment device for molten iron stirring, comprising a fume treatment device body, characterized in that, The main body of the dust treatment device includes a support platform (1), a platform steel beam (2) is provided below the support platform (1), a variable diameter protective sleeve (3) is provided below the platform steel beam (2), a stirring shaft hole platform (4) is provided below the variable diameter protective sleeve (3), a flue gas escaping zone (5) is provided between the variable diameter protective sleeve (3) and the stirring shaft hole platform (4), and a nitrogen sealing device (6) is provided inside the variable diameter protective sleeve (3).

2. The fume treatment device for molten iron stirring according to claim 1, characterized in that, The nitrogen sealing device (6) includes an upper cover plate (7), and a lower sealing opening (8) is provided at the lower end of the upper cover plate (7). The upper cover plate (7) and the lower sealing opening (8) are arranged in a concentric circle structure. The inner diameter of the upper cover plate (7) is larger than the inner diameter of the lower sealing opening (8). Nitrogen gas inlet steel pipes (9) are respectively provided on both sides of the top of the upper cover plate (7). Several sets of lifting lugs (10) are provided between the nitrogen gas inlet steel pipes (9).

3. The fume treatment device for molten iron stirring according to claim 2, characterized in that, The upper cover plate (7) is fitted with a nitrogen outer ring (11), and the lower seal (8) is fitted with a nitrogen inner ring (12). The upper cover plate (7) and the nitrogen outer ring (11) are continuously welded together around the perimeter. The lower seal (8) and the nitrogen inner ring (12) are continuously welded together around the perimeter. The nitrogen outer ring (11) is fitted with an isolation plate (13) to isolate the two nitrogen inlet steel pipes (9).

4. The fume treatment device for molten iron stirring according to claim 3, characterized in that, The nitrogen outer ring (11) is generally arranged in a conical structure. The inner diameter of the top of the nitrogen outer ring (11) is larger than the inner diameter of the bottom of the nitrogen outer ring (11). The nitrogen inner ring (12) is arranged in a circular shape. The nitrogen outer ring (11) is provided with an outer nitrogen nozzle (14), and the nitrogen inner ring (12) is provided with an inner nitrogen nozzle (15).

5. The ferrous dust treatment device for molten iron stirring according to claim 4, characterized in that, The outer nitrogen nozzle (14) on the outer nitrogen ring (11) is arranged in a single-row structure, and the inner nitrogen nozzle (15) is arranged in a double-row structure, consisting of an inner upper nitrogen nozzle (16) and an inner lower nitrogen nozzle (17). The inner upper nitrogen nozzle (16) and the inner lower nitrogen nozzle (17) are staggered by 4-6°.

6. The fume treatment device for molten iron stirring according to claim 1, characterized in that, The variable diameter casing (3) is arranged in a conical structure. The top of the flue gas escaping zone (5) is provided with a sealing cover plate (18), which is connected to the variable diameter casing (3) through the sealing cover plate (18). The center of the sealing cover plate (18) is provided with a docking hole (19).

7. The iron molten metal stirring fume treatment device according to claim 6, characterized in that, The two sides of the docking hole (19) are respectively provided with a desulfurizing agent discharge port (20) and an air intake port (21). The air intake port (21) is welded to the external air intake branch pipe. The flue gas escaping area (5) is surrounded by a steel ladle side suction hood (22).

Images