Pulverized coal mixing device for blast furnace coal injection

Abstract

The utility model discloses a pulverized coal mixing device for blast furnace coal injection, and relates to the technical field of blast furnace smelting. The device comprises a conveying cylinder, a discharging bin fixedly communicated with one end of the top of the conveying cylinder, a grinding box fixedly communicated with the top of the discharging bin and a feeding hopper fixedly communicated with the top of the grinding box, and further comprises a grinding mechanism, a transmission mechanism, a material mixing and conveying mechanism and a vibration screening mechanism. Through the vibration screening effect, blast furnace fly ash and pulverized coal which are fully ground can be effectively screened out, and uniform granularity in the mixing process of the blast furnace fly ash and the pulverized coal can be ensured; the screened mixture of the blast furnace fly ash and the pulverized coal enters the material mixing and conveying mechanism and is fully mixed while being conveyed, so that the mixing effect of the blast furnace fly ash and the pulverized coal is improved; and the using effect of blast furnace smelting using the powder mixture of the blast furnace dedusting ash and the pulverized coal as the fuel is further improved.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace smelting technology, specifically to a pulverized coal mixing device for blast furnace pulverized coal injection. Background Technology

[0002] Modern blast furnace smelting requires coke, which serves to provide the heat needed for the smelting process; act as a reducing agent for reducing iron ore; and maintain the permeability of the blast furnace burden. Pulverized coal injection (PCO) involves directly injecting finely ground anthracite, bituminous coal, or a mixture of both into the blast furnace through the tuyeres to replace coke in providing heat and acting as a reducing agent, thereby reducing the coke ratio and saving on pig iron costs. Although pulverized coal is cheaper than coke, its use as fuel in continuous industrial production still results in higher blast furnace smelting costs.

[0003] To address the aforementioned technical challenges, Chinese utility model patent application number 202321745195.3 discloses a pulverized coal mixing device for blast furnace pulverized coal injection, comprising a first hopper, a second hopper, a coal mill, and an injection tank. The technical solution primarily involves grinding blast furnace dust and pulverized coal in a specific mixing ratio before conveying them into the blast furnace for use as fuel. Since the blast furnace dust contains a certain amount of iron powder and coke powder, the addition of pulverized coal not only allows for the recycling of the blast furnace dust but also solves the problem of high costs associated with using pulverized coal as fuel. However, this existing technology does not perform a sieving process on the blast furnace dust and pulverized coal after grinding, resulting in uneven particle size during mixing. Furthermore, the simple pipeline transportation method prevents further thorough mixing during transport, leading to poor mixing results.

[0004] Therefore, a pulverized coal mixing device for blast furnace pulverized coal injection is proposed. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a pulverized coal mixing device for blast furnace pulverized coal injection.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A pulverized coal mixing device for blast furnace pulverized coal injection includes a conveying cylinder, a discharge hopper fixedly connected to one end of the top of the conveying cylinder, a grinding box fixedly connected to the top of the discharge hopper, and a feeding hopper fixedly connected to the top of the grinding box. It also includes a grinding mechanism, a transmission mechanism, a material mixing and conveying mechanism, and a vibrating screening mechanism.

[0008] The grinding mechanism includes a rotating shaft rotatably installed in the grinding box and a grinding wheel fixedly connected to the rotating shaft and located in the grinding box; the mixing and conveying mechanism includes a drive shaft rotatably installed in the conveying cylinder and spiral conveying blades welded to the outer wall of the drive shaft.

[0009] The transmission mechanism includes a support plate fixedly connected to the side wall of the grinding box, a drive motor fixedly installed on the bottom outer wall of the support plate, a drive pulley fixedly mounted on the rotating shaft, and a driven pulley fixedly mounted on the transmission shaft.

[0010] Furthermore, a compression gap is provided between the grinding box and the grinding wheel, and the driving pulley and the driven pulley are connected by the same transmission belt.

[0011] Furthermore, one end of the rotating shaft passes through one side of the grinding box and is coaxially and fixedly connected to the output shaft of the drive motor via a coupling.

[0012] Furthermore, the vibrating screening mechanism includes a screen installed in the discharge bin, four spring telescopic members installed at the four corners of the bottom of the screen, and a vibrator fixedly installed at the bottom of the screen. The screen is connected to the inner wall of the discharge bin through the four spring telescopic members at the four corners of the bottom.

[0013] Furthermore, a control panel is fixedly installed on the top outer wall of the support plate.

[0014] Furthermore, two support frames are welded sequentially to the bottom outer wall of the conveying cylinder, and a discharge pipe is fixedly connected to one end of the bottom of the conveying cylinder.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention utilizes the coordinated operation of a vibrating screening mechanism and a material mixing and conveying mechanism. Through the effect of vibrating screening, it can effectively screen out fully ground blast furnace dust and coal powder, ensuring uniform particle size during the mixing process. After screening, the mixture of blast furnace dust and coal powder enters the material mixing and conveying mechanism, where it is further mixed while being conveyed, thereby improving the mixing effect of blast furnace dust and coal powder and enhancing the effectiveness of using the powder mixture of blast furnace dust and coal powder as fuel in blast furnace smelting. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 This is a three-dimensional schematic diagram of the conveyor cylinder section after being cut apart in this utility model;

[0019] Figure 3 This is a three-dimensional schematic diagram of the vertical cross-section of this utility model;

[0020] Figure 4 This is a three-dimensional enlarged schematic diagram of the transmission mechanism in this utility model;

[0021] Figure 5 This is a three-dimensional enlarged schematic diagram of the vibrating screening mechanism in the discharge bin of this utility model;

[0022] Figure 6 This is a three-dimensional enlarged schematic diagram of the vibrating screening mechanism in this utility model.

[0023] Reference numerals in the attached diagram: 1. Conveying cylinder; 2. Discharge bin; 3. Grinding box; 4. Feed hopper; 5. Rotating shaft; 6. Grinding wheel; 7. Drive shaft; 8. Spiral conveyor blades; 9. Support plate; 10. Drive motor; 11. Driving pulley; 12. Driven pulley; 13. Transmission belt; 14. Screen; 15. Spring telescopic component; 16. Vibrator; 17. Support frame; 18. Control panel. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. 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, a pulverized coal mixing device for blast furnace pulverized coal injection includes a conveying cylinder 1, a discharge hopper 2 fixedly connected to one end of the top of the conveying cylinder 1, a grinding box 3 fixedly connected to the top of the discharge hopper 2, a feeding hopper 4 fixedly connected to the top of the grinding box 3, a grinding mechanism, a transmission mechanism, a material mixing and conveying mechanism, and a vibrating screening mechanism.

[0029] like Figure 3 As shown, the grinding mechanism includes a rotating shaft 5 rotatably installed in the grinding box 3 and a grinding wheel 6 fixedly connected to the rotating shaft 5 and located in the grinding box 3. A compression gap is provided between the grinding box 3 and the grinding wheel 6. Specifically, the grinding wheel 6 is driven to rotate in the grinding box 3 by the rotating shaft 5, which can fully grind and crush the blast furnace dust and coal powder mixture in the compression gap, so as to form a powder mixture of blast furnace dust and coal powder.

[0030] like Figure 2 As shown, the mixing and conveying mechanism includes a drive shaft 7 rotatably installed inside the conveying cylinder 1 and a spiral conveying blade 8 welded to the outer wall of the drive shaft 7; specifically, by driving the spiral conveying blade 8 to rotate through the drive shaft 7, the blast furnace dust and coal powder mixture, which have been ground into powder, can be conveyed and fully mixed at the same time.

[0031] like Figure 2 and Figure 4 As shown, the transmission mechanism includes a support plate 9 fixedly connected to the side wall of the grinding chamber 3, a drive motor 10 fixedly installed on the bottom outer wall of the support plate 9, a drive pulley 11 fixedly mounted on the rotating shaft 5, and a driven pulley 12 fixedly mounted on the transmission shaft 7. One end of the rotating shaft 5 passes through one side of the grinding chamber 3 and is coaxially fixedly connected to the output shaft of the drive motor 10 through a coupling. The drive pulley 11 and the driven pulley 12 are connected by the same transmission belt 13. Specifically, the drive motor 10 controls the rotation of the drive pulley 11 on the rotating shaft 5, and then, under the transmission effect of the transmission belt 13, the drive pulley 11 and the driven pulley 12 drive the transmission shaft 7 to rotate. This realizes the linkage between the grinding mechanism and the material mixing and conveying mechanism, so that both can be controlled by the same drive motor 10, which is beneficial to improving the utilization rate of the drive motor 10.

[0032] like Figure 3 and Figure 5-6 As shown, the vibrating screening mechanism includes a screen 14 located inside the discharge hopper 2, four spring telescopic members 15 located at the four corners of the bottom of the screen 14, and a vibrator 16 fixedly installed at the bottom of the screen 14. The screen 14 is connected to the inner wall of the discharge hopper 2 through the four spring telescopic members 15 at the four corners of the bottom. Specifically, the screen 14 vibrates by operating the vibrator 16 to achieve the effect of vibrating screening, thereby effectively screening out the well-ground blast furnace dust and coal powder, ensuring uniform particle size during the mixing process of blast furnace dust and coal powder, which is beneficial to improving the mixing effect of blast furnace dust and coal powder.

[0033] like Figure 1 As shown, two support frames 17 are welded sequentially to the bottom outer wall of the conveying cylinder 1. A discharge pipe is fixedly connected to one end of the bottom of the conveying cylinder 1. A control panel 18 is fixedly installed on the top outer wall of the support plate 9. The control panel 18 is electrically connected to the drive motor 10 and the vibrator 16.

[0034] In summary: When this utility model is in operation, firstly, the blast furnace dust and coal powder, after being proportioned, are added from the feed hopper 4 into the grinding box 3. At this time, the drive motor 10 controls the drive pulley 11 on the rotating shaft 5 to rotate. Then, under the transmission effect of the transmission belt 13, the driven pulley 12 drives the transmission shaft 7 to rotate. In turn, the rotating shaft 5 drives the grinding wheel 6 to rotate in the grinding box 3, which can fully grind and crush the blast furnace dust and coal powder mixture in the extrusion gap, so as to form a powder mixture of blast furnace dust and coal powder.

[0035] Secondly, the vibrator 16 causes the screen 14 to vibrate to achieve the effect of vibratory screening, which can effectively screen out the well-ground blast furnace dust and coal powder, ensuring uniform particle size during the mixing process of blast furnace dust and coal powder, thereby improving the mixing effect of blast furnace dust and coal powder.

[0036] Finally, the drive shaft 7 drives the spiral conveyor blades 8 to rotate, so that the blast furnace dust and pulverized coal mixture, which has been ground into powder, can be conveyed and fully mixed at the same time. Finally, the blast furnace dust and pulverized coal mixture is discharged into the blast furnace from the discharge pipe and the mixed pulverized coal is directly injected into the furnace from the blast furnace tuyeres.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pulverized coal mixing device for blast furnace coal injection, comprising a conveying cylinder (1), a discharge bin (2) fixedly connected to one end of the top of the conveying cylinder (1), a grinding box (3) fixedly connected to the top of the discharge bin (2), and a feed hopper (4) fixedly connected to the top of the grinding box (3), characterized in that, It also includes a grinding mechanism, a transmission mechanism, a material mixing and conveying mechanism and a vibrating screening mechanism. The grinding mechanism includes a rotating shaft (5) rotatingly installed in the grinding box (3) and a grinding wheel (6) fixedly connected to the rotating shaft (5) and located in the grinding box (3); the mixing and conveying mechanism includes a transmission shaft (7) rotatingly installed in the conveying cylinder (1) and spiral conveying blades (8) welded to the outer wall of the transmission shaft (7). The transmission mechanism includes a support plate (9) fixedly connected to the side wall of the grinding box (3), a driving motor (10) fixedly installed at the bottom outer wall of the support plate (9), a driving pulley (11) fixedly sleeved on the rotating shaft (5) and a driven pulley (12) fixedly sleeved on the transmission shaft (7).

2. The pulverized coal mixing device for coal injection of a blast furnace according to claim 1, characterized by, The grinding box (3) is provided with an extrusion gap between the grinding box (3) and the grinding wheel (6), and the driving pulley (11) and the driven pulley (12) are drivingly connected through the same transmission belt (13).

3. The pulverized coal mixing device for coal injection of a blast furnace according to claim 1, characterized by, One end of the rotating shaft (5) penetrates through one side of the grinding box (3) and is coaxially fixedly connected with the output shaft of the driving motor (10) through a shaft coupling.

4. The pulverized coal mixing device for coal injection of a blast furnace according to claim 1, characterized by The vibrating screening mechanism includes a screen (14) arranged in the discharge bin (2), four spring expansion members (15) arranged at the bottom four corner positions of the screen (14) and a vibrator (16) fixedly installed at the bottom of the screen (14), and the screen (14) is connected with the inner wall of the discharge bin (2) through the four spring expansion members (15) at the bottom four corner positions.

5. The pulverized coal mixing device for coal injection of a blast furnace according to claim 1, characterized by The top outer wall of the support plate (9) is fixedly installed with a control panel (18).

6. The pulverized coal mixing device for coal injection of a blast furnace according to claim 1, characterized by The bottom outer wall of the conveying cylinder (1) is sequentially welded with two support frames (17), and one end of the bottom of the conveying cylinder (1) is fixedly communicated with a discharge pipe.

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