A desulfurizer feeding device for a high-temperature molten iron on-stream desulfurization system

Abstract

The utility model discloses a desulfurizer feeding device for blast furnace hot metal flow desulfurization system, including the storage tank of the open design of top, the inside of storage tank is provided with the vibrating screen, the inside of vibrating screen upper end is provided with the bag opener, vibrating screen outer wall is provided with a plurality of with the elastic connecting piece of storage tank inner wall connection, the bottom of storage tank is connected with the impeller feeder, the bottom of impeller feeder is connected with the transverse arrangement of screw conveyer, the outlet of screw conveyer is provided with the downcomer. The present application realizes the continuous operation of desulfurizer from bagged feeding to accurate feeding, reduces manual intervention process such as bagging, handling etc.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical ironmaking technology, and in particular relates to a desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system. Background Technology

[0002] In the desulfurization process of blast furnace hot metal, the traditional method commonly uses manual addition of bagged desulfurizing agent (20 kg / bag). During the operation, workers need to pour the entire bag of desulfurizing agent directly into the molten iron trough or ladle, which has the following significant drawbacks:

[0003] Because the desulfurizing agent is added in bulk bags, some of it may clump together beforehand, making it difficult to disperse quickly in the molten iron, resulting in localized excessively high or low concentrations. Furthermore, the large amount of desulfurizing agent added at once means that some of it fails to fully contact the molten iron, forming clumps or slag, resulting in an actual reaction efficiency of less than 50%, severely impacting the desulfurization effect and causing large fluctuations in the final sulfur content of the molten iron (±0.008%).

[0004] Manual addition relies on experience and judgment, which can easily lead to over-addition. This not only wastes the desulfurizing agent (increasing consumption by 15-20 kg per ton of iron), but also causes excessive temperature drop in molten iron (10-15℃) due to excessive reaction, affecting subsequent steelmaking processes.

[0005] Furthermore, the metallurgical environment is characterized by high temperatures, requiring workers to frequently handle heavy bags, which poses occupational health risks such as burns and dust inhalation. Each tapping operation requires the addition of 10-15 bags (200-300 kg), resulting in low operational efficiency and difficulty in meeting the fast-paced production demands of modern blast furnaces.

[0006] Although some existing technologies have attempted to use mechanical feeding devices, problems such as poor feeding accuracy, easy clogging, and inability to be directly added to bagged desulfurizers still exist. Summary of the Invention

[0007] The purpose of this invention is to address the problems existing in the prior art by providing a desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system.

[0008] To achieve the above objectives, the utility model employs the following technical solution: a desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system, comprising a storage tank with an open top, a vibrating screen inside the storage tank, a bag opener at the upper inner side of the vibrating screen, multiple elastic connectors connected to the inner wall of the storage tank on the outer wall of the vibrating screen, an impeller feeder connected to the bottom of the storage tank, a horizontally arranged screw conveyor connected to the bottom of the impeller feeder, and a discharge pipe at the outlet end of the screw conveyor.

[0009] The above technical solution enables continuous operation of desulfurizing agent from bagged dispensing to precise dispensing, reducing manual intervention processes such as bag opening and handling, thereby significantly improving efficiency. The combination of impeller feeder and screw conveyor ensures that the desulfurizing agent is uniformly and controllably delivered to the molten iron flow.

[0010] Optionally, the vibrating screen includes a screen cylinder whose outer wall is connected to the elastic connector. The inner wall of the screen cylinder is provided with a fine screen and a coarse screen from bottom to top, with the coarse screen and the fine screen spaced 50-70 cm apart. The outer wall of the screen cylinder is provided with a vibrating motor.

[0011] In the above technical solution, a coarse screen is used to intercept large particles or clumps, while a fine screen ensures that the particle size of the desulfurizing agent meets the requirements for high-efficiency desulfurization, thereby increasing the reaction specific surface area and desulfurization efficiency. At the same time, a vibrating motor is used to provide high-frequency vibration, which can break up the clumps of desulfurizing agent to ensure continuous and stable feeding.

[0012] Optionally, the upper surface of the coarse screen is equipped with multiple crushing rods distributed in a matrix, with an interval of 2-3 cm between adjacent crushing rods, a length of 5-7 cm, and a pointed tip. The crushing rods can actively pierce the agglomerated desulfurizing agent, and with the high-frequency vibration of the vibrating motor, the desulfurizing agent can be further refined.

[0013] Optionally, both the upper and lower ends of the vibrating screen are connected to cloth hoppers, which are elastic cloth hoppers. The end of the cloth hopper away from the vibrating screen is provided with an installation ring that connects to the inner wall of the storage tank. The elastic cloth hoppers prevent desulfurizing agent dust from overflowing from the vibrating screen and avoid large pieces of desulfurizing agent from jumping directly from the vibrating screen into the gap between the vibrating screen and the storage tank.

[0014] Optionally, the bag opener includes multiple arc-shaped cones coaxial with the storage tank. The outer wall of the arc-shaped cones is provided with multiple supporting steel bars connected to the inner wall of the vibrating screen. The spacing between the supporting steel bars is 7-12 cm. The arc-shaped cones are located above the inlet of the vibrating screen.

[0015] In the above technical solution, the arc-shaped cone directly pierces the packaging bag containing the desulfurizing agent and guides the desulfurizing agent to fall precisely into the center of the vibrating screen to avoid segregation, while the supporting steel bars can open up and intercept the packaging bag, making it convenient for the robotic arm to remove the packaging bag.

[0016] Optionally, the elastic connector includes a spring, with mounting plates welded to both ends. The two mounting plates are respectively connected to the outer wall of the vibrating screen and the inner wall of the storage tank. All the springs are distributed around the outer periphery of the vibrating screen. The vibrating screen is suspended in the storage tank by the springs, providing sufficient vibration space for the vibration of the vibrating screen. At the same time, it can absorb a large amount of vibration and reduce the resonance effect on the storage tank.

[0017] Optionally, the outer wall of the storage tank is provided with a reserved opening corresponding to the position of the vibration motor, so that workers can inspect or replace the vibration motor without disassembling the storage tank, thereby shortening downtime.

[0018] Optionally, the discharge pipe includes a corrugated pipe that connects to the outlet end of the screw conveyor. The other end of the corrugated pipe is a rigid pipe, and the other end of the rigid pipe is provided with a guide plate. The guide plate is V-shaped, and the corrugated pipe can be adjusted in angle within a certain range. With the help of the V-shaped guide plate, the desulfurizing agent can be accurately and directionally sprayed.

[0019] Optionally, a support frame is provided around the storage tank and the screw conveyor to support the device and to resist the high-temperature vibration of the molten iron treatment zone, preventing the equipment from shifting or deforming.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This application realizes continuous operation of desulfurizing agent from bagged delivery to precise delivery, reducing manual intervention processes such as bag opening and handling, thereby significantly improving efficiency. The combination of impeller feeder and screw conveyor ensures that the desulfurizing agent is delivered to the molten iron flow evenly and controllably, avoiding the formation of clumps or slag due to insufficient contact with molten iron caused by a large amount of desulfurizing agent at one time; 2. Large particles or clumps are intercepted by a coarse screen, and the particle size of the desulfurizing agent is ensured to meet the particle size requirements of high-efficiency desulfurization by a fine screen, thereby improving the reaction specific surface area and desulfurization efficiency. At the same time, the high-frequency vibration provided by the vibrating motor can break up the clumps of desulfurizing agent, ensuring that the desulfurizing agent can quickly dissolve in the molten iron and also ensuring continuous and stable feeding; 3. The crushing rod can actively pierce the clumps of desulfurizing agent, and the high-frequency vibration of the vibrating motor can better refine the desulfurizing agent. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to the present invention;

[0022] Figure 2 This is a schematic diagram of the vibrating screen of this utility model;

[0023] Figure 3 This is a schematic diagram of a cross-section of the vibrating screen of this utility model;

[0024] Figure 4 This is a schematic diagram of the coarse screen of this utility model.

[0025] In the diagram: 1. Storage tank; 2. Vibrating screen; 21. Screen cylinder; 22. Fine screen; 23. Coarse screen; 24. Crushing rod; 25. Vibrating motor; 3. Bag opener; 31. Arc-shaped cone; 32. Supporting steel bar; 4. Elastic connector; 41. Spring component; 42. Mounting plate; 5. Cloth hopper; 51. Mounting ring; 6. Impeller feeder; 7. Screw conveyor; 8. Discharge pipe; 9. Guide plate; 100. Support frame. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figure 1 As shown in Figure 4, the specific scheme of the embodiment is as follows: A desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system includes a storage tank 1 with an open top, a vibrating screen is installed inside the storage tank 1, a bag opener 3 is installed on the upper inner side of the vibrating screen, a plurality of elastic connecting parts 4 connected to the inner wall of the storage tank 1 are installed on the outer wall of the vibrating screen, an impeller feeder 6 is connected to the bottom of the storage tank 1, a horizontally arranged screw conveyor 7 is connected to the bottom of the impeller feeder 6, and a discharge pipe 8 is installed at the outlet end of the screw conveyor 7.

[0029] The above technical solution enables continuous operation of desulfurizing agent from bagged dispensing to precise dispensing, reducing manual intervention processes such as bag opening and handling, thereby significantly improving efficiency. The combination of impeller feeder 6 and screw conveyor 7 ensures that the desulfurizing agent is uniformly and controllably delivered to the molten iron flow.

[0030] It should be noted that in this application, the impeller feeder 6 and the screw conveyor 7 are all products that are already available on the market. The specific model can be freely selected according to the scale of the factory, and there is no limitation on it. It is only necessary to achieve the effect required in this application.

[0031] It should be noted that in this embodiment, the equipment is directly controlled by a PLC control box, which flexibly adjusts the feeding of the impeller feeder 6 and the screw conveyor 7 according to parameters such as molten iron temperature, flow rate and sulfur content transmitted from the metallurgical system.

[0032] In addition, both the screw conveyor 7 and the impeller feeder 6 in this application use variable frequency motors to achieve adjustable speed.

[0033] In this embodiment, the vibrating screen includes a screen cylinder 21 whose outer wall is connected to an elastic connector 4. The screen cylinder 21 is provided with a fine screen 22 and a coarse screen 23 from bottom to top. The coarse screen 23 and the fine screen 22 are spaced 50-70 cm apart vertically. A vibrating motor 25 is provided on the outer wall of the screen cylinder 21.

[0034] In the above technical solution, large particles or clumps are intercepted by the coarse screen 23, and the fine screen 22 ensures that the particle size of the desulfurizing agent meets the particle size requirements for high-efficiency desulfurization, thereby improving the reaction specific surface area and desulfurization efficiency. At the same time, the vibration motor 25 provides high-frequency vibration, which can break up the clumps of desulfurizing agent to ensure continuous and stable feeding.

[0035] In this embodiment, a plurality of crushing rods 24 are installed on the upper surface of the coarse screen 23 in a matrix arrangement. The interval between adjacent crushing rods 24 is 2-3 cm, the length of the crushing rods 24 is 5-7 cm, and the top of the crushing rods 24 is a sharp point. The crushing rods 24 can actively pierce the agglomerated desulfurizing agent. Combined with the high-frequency vibration of the vibration motor 25, the desulfurizing agent can be better refined.

[0036] In this embodiment, both the upper and lower ends of the vibrating screen are connected to a cloth hopper 5. The cloth hopper 5 is an elastic cloth hopper 5. The end of the cloth hopper 5 away from the vibrating screen is provided with an installation ring 51 that is connected to the inner wall of the storage tank 1. The elastic cloth hopper 5 blocks the desulfurizing agent dust from overflowing from the vibrating screen 2, and prevents large pieces of desulfurizing agent from jumping directly from the vibrating screen 2 into the gap between the vibrating screen and the storage tank 1.

[0037] In this embodiment, the bag opener 3 includes multiple arc-shaped cones 31 coaxial with the storage tank 1. The outer wall of the arc-shaped cones 31 is provided with multiple supporting steel bars 32 connected to the inner wall of the vibrating screen. The spacing between the supporting steel bars 32 is 7-12 cm. The arc-shaped cones 31 are located above the inlet of the vibrating screen.

[0038] In the above technical solution, the arc-shaped cone 31 directly punctures the packaging bag containing the desulfurizing agent and guides the desulfurizing agent to fall precisely into the center of the vibrating screen to avoid segregation, while the supporting steel bar 32 can open up and intercept the packaging bag, making it convenient for the robotic arm to remove the packaging bag.

[0039] It should be noted that this device will be used in conjunction with a robotic arm available on the market. The principle of the robotic arm will not be elaborated here. The robotic arm will grab the whole bag of desulfurizer and place it above the storage tank 1 to complete the delivery. After the bag of desulfurizer falls onto the arc-shaped cone 31 and is punctured by the arc-shaped cone 31, the desulfurizer inside is released. After the desulfurizer inside the bag is released, the robotic arm will grab the empty bag and remove it.

[0040] In this embodiment, the elastic connector 4 includes a spring 41, with mounting plates 42 welded to both ends of the spring 41. The two mounting plates 42 are respectively connected to the outer wall of the vibrating screen and the inner wall of the storage tank 1. All the springs 41 are distributed in a ring around the outer periphery of the vibrating screen 2. The vibrating screen 2 is suspended in the storage tank 1 by the springs 41, providing sufficient vibration space for the vibration of the vibrating screen 2. At the same time, it can absorb a large amount of vibration and reduce the resonance effect on the storage tank 1.

[0041] In this embodiment, the outer wall of the storage tank 1 is provided with a reserved opening corresponding to the position of the vibration motor 25, so that workers can inspect or replace the vibration motor 25 without disassembling the storage tank 1, thereby shortening downtime.

[0042] In this embodiment, the feed pipe 8 includes a corrugated pipe that is connected to the outlet end of the screw conveyor 7. The other end of the corrugated pipe is a rigid pipe, and the other end of the rigid pipe is provided with a guide plate 9. The guide plate 9 is V-shaped. The corrugated pipe can be adjusted within a certain range of angles. With the help of the V-shaped guide plate 9, the desulfurizing agent can be accurately and directionally sprayed.

[0043] In this embodiment, a support frame 100 is provided around the storage tank 1 and the screw conveyor 7 to support the device and to resist the high temperature vibration of the molten iron treatment zone, preventing the equipment from shifting or deforming.

[0044] The working principle of the above embodiment is as follows: After the bagged desulfurizer is put into the storage tank 1 through the opening at the top, the bag opener 3's arc-shaped cone 31 first punctures the packaging bag, and the supporting steel bar 32 blocks the packaging bag, allowing the desulfurizer to fall into the center of the vibrating screen 2. At the same time, the empty bag can be removed by the robot arm. After the desulfurizer enters the vibrating screen 2, the crushing rods 24 on the surface of the coarse screen 23 actively puncture the agglomerates, and the high-frequency vibration of the vibrating motor 25 further crushes the agglomerates. The coarse screen 23 intercepts large particles, and the fine screen 22 ensures that the particle size of the desulfurizer meets the requirements of high-efficiency desulfurization. During the vibration, the elastic cloth hopper 5 seals the gaps in the screen body to suppress dust overflow. The screened desulfurizer falls to the impeller feeder 6, where its rotating blades achieve quantitative feeding, and then it is horizontally pushed to the outlet end by the screw conveyor 7. Finally, the desulfurizing agent is adjusted at an angle through the corrugated pipe of the feed pipe 8 and sprayed directionally to the center of the blast furnace molten iron flow by the V-shaped guide plate 9, so as to achieve full mixing and reaction by utilizing the impact kinetic energy of the molten iron; the elastic connector 4 absorbs more than 290% of the vibration energy of the vibrating screen to avoid resonance damage to the tank.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system, characterized in that, The device includes a storage tank with an open top, a vibrating screen inside the storage tank, a bag opener on the upper inner side of the vibrating screen, multiple elastic connectors on the outer wall of the vibrating screen that connect to the inner wall of the storage tank, an impeller feeder connected to the bottom of the storage tank, a horizontally arranged screw conveyor connected to the bottom of the impeller feeder, and a discharge pipe at the outlet end of the screw conveyor.

2. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 1, characterized in that: The vibrating screen includes a screen cylinder whose outer wall is connected to the elastic connector. The inner wall of the screen cylinder is provided with a fine screen and a coarse screen from bottom to top, with the coarse screen and the fine screen spaced 50-70 cm apart. The outer wall of the screen cylinder is provided with a vibrating motor.

3. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 2, characterized in that: The upper surface of the coarse screen is equipped with multiple crushing rods arranged in a matrix, with an interval of 2-3 cm between adjacent crushing rods, a length of 5-7 cm, and a pointed tip.

4. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 1, characterized in that: Both ends of the vibrating screen are connected to cloth hoppers, which are elastic cloth hoppers. The end of the cloth hopper away from the vibrating screen is provided with an installation ring that connects to the inner wall of the storage tank.

5. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 1, characterized in that: The bag opener includes multiple arc-shaped cones coaxial with the storage tank. The outer wall of the arc-shaped cones is provided with multiple supporting steel bars connected to the inner wall of the vibrating screen. The spacing between the supporting steel bars is 7-12 cm. The arc-shaped cones are located above the inlet of the vibrating screen.

6. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 1, characterized in that: The elastic connector includes a spring component, with mounting plates welded to both ends of the spring component. The two mounting plates are respectively connected to the outer wall of the vibrating screen and the inner wall of the storage tank. All the spring components are distributed in a ring around the outer periphery of the vibrating screen.

7. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 2, characterized in that: The outer wall of the storage tank has a reserved opening corresponding to the position of the vibration motor.

8. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 1, characterized in that: The feed pipe includes a corrugated pipe that connects to the outlet end of the screw conveyor. The other end of the corrugated pipe is a rigid pipe, and the other end of the rigid pipe is provided with a guide plate, which is V-shaped.

9. The desulfurizing agent dosing device for a blast furnace molten iron in-flow desulfurization system according to claim 1, characterized in that: The storage tank and the screw conveyor are equipped with support frames on their outer periphery.

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