Blast furnace ironmaking distribution chute

Abstract

The utility model relates to the technical field of ironmaking equipment, and discloses a blast furnace ironmaking distribution chute which comprises a chute body with a trapezoidal cross section and a plurality of wear-resisting plates distributed along the longitudinal direction of the chute body, and the wear-resisting plates are all detachably connected to the inner wall of the chute body. The wear-resisting plates comprise the first wear-resisting plate with the trapezoidal inner side and the second wear-resisting plate with the arc-shaped inner side, the first wear-resisting plate is close to the discharging end of the groove body, the second wear-resisting plate is close to the feeding end of the groove body, and the bottom of the arc-shaped surface of the second wear-resisting plate is flush with the bottom of the inner side of the first wear-resisting plate. Or the bottom of the arc-shaped surface on the second wear-resisting plate is higher than the bottom of the inner side of the first wear-resisting plate. The heat conduction area between the first wear-resisting plate and the tank body and between the second wear-resisting plate and the tank body can be reduced, so that the heat transferred from furnace charge to the tank body can be reduced, the strength and the rigidity are prevented from being reduced due to over-high temperature of the tank body, and the tank body is prevented from being deformed due to high temperature.

Description

Technical Field

[0001] This utility model relates to the field of ironmaking equipment technology, and in particular to a blast furnace ironmaking charging chute. Background Technology

[0002] The charging chute is an important device used in the ironmaking process of blast furnaces in steel enterprises. Installed at the top of the blast furnace, the charging charge falls into the chute from its inlet end and then slides out from its outlet end. The rotation of the chute evenly distributes the charge into the upper part of the blast furnace cavity. During operation, the charging chute experiences friction with the falling high-temperature charge, causing it to wear easily.

[0003] The cloth chute was originally made of wear-resistant material and cast in one piece. If a certain part (especially the feed end which is subject to greater impact) is severely worn, the entire cloth chute needs to be replaced, which is not only time-consuming and labor-intensive, but also results in high operating and maintenance costs.

[0004] To reduce the operating costs of the charging chute, wear-resistant plates are attached to the inside of the chute. When the wear-resistant plates wear out, they only need to be replaced, thus reducing operating costs. However, the wear-resistant plates are tightly fitted to the chute body, making their installation and removal time-consuming and labor-intensive. Furthermore, because the wear-resistant plates cover the entire inner wall of the chute, a large quantity is required, resulting in high replacement costs. Additionally, the large surface area of ​​the wear-resistant plates increases the heat conduction area, causing the heat from the furnace charge to be rapidly transferred to the chute body, potentially leading to reduced chute strength and high-temperature deformation.

[0005] Patent CN220745979U discloses a wear-resistant structure for a chute liner, comprising a liner substrate and an alloy block. Grooves are provided on the working surface of the liner substrate, and the alloy block is embedded in the grooves. This method strengthens the connection between the alloy block and the liner substrate, improving the service life of the chute liner. However, in practice, since the liner is attached to the inside of the fabric chute, liner replacement is cumbersome, time-consuming, and labor-intensive. Furthermore, because the liner substrate has a large contact area with the chute body after attachment, the heat conduction area is also large. This allows the high-temperature furnace charge falling onto the liner to quickly transfer heat to the chute body, causing the chute temperature to rise rapidly and making the chute prone to high-temperature deformation. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a blast furnace ironmaking charging chute, which solves the problems of high operation and maintenance costs caused by the large area of ​​the wear-resistant liner plate of the current charging chute, and the easy high-temperature deformation of the chute body due to the large heat conduction area of ​​the wear-resistant liner plate.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A blast furnace ironmaking charging chute includes a chute body with a trapezoidal cross-section and several wear-resistant plates distributed longitudinally along the chute body. Each wear-resistant plate is detachably connected to the inner wall of the chute body and is perpendicular to the inner wall. The wear-resistant plates are arranged transversely. Each wear-resistant plate includes a first wear-resistant plate with a trapezoidal inner side and a second wear-resistant plate with an arc-shaped inner side. The first wear-resistant plate is near the discharge end of the chute body, and the second wear-resistant plate is near the inlet end of the chute body. The bottom of the arc-shaped surface of the second wear-resistant plate is flush with the bottom of the inner side of the first wear-resistant plate, or the bottom of the arc-shaped surface of the second wear-resistant plate is higher than the bottom of the inner side of the first wear-resistant plate.

[0009] Furthermore, the tank body has an installation groove at its bottom along the longitudinal direction of the tank body, and several stiffening plates are distributed at the bottom of the installation groove along the transverse direction of the tank body. The stiffening plates are all arranged along the longitudinal direction of the tank body, and the top of the stiffening plates is covered by a partition plate. One of the tank body and the partition plate is fixedly connected to the stiffening plate, and the partition plate is sandwiched between the first wear-resistant plate and the stiffening plate and between the second wear-resistant plate and the stiffening plate.

[0010] Furthermore, the partition and the bottom of the mounting groove form a closed space, and the stiffening plate divides this space into several air ducts. The air ducts are all arranged longitudinally along the groove body, and the air in the air ducts flows longitudinally along the groove body.

[0011] Furthermore, the bottom of the tank is provided with two wind hoods, which are located near the two ends of the tank. Both wind hoods are arranged horizontally, and the interior of each wind hood is a wind chamber. The two wind hoods are located at the two ends of the air duct, and the two ends of each air duct are connected to the corresponding wind chamber. The bottom of each wind hood is provided with air holes, and the two air holes are connected to the corresponding wind chamber.

[0012] Furthermore, the inner wall of the groove is provided with mounting grooves at positions corresponding to the first wear-resistant plate or the second wear-resistant plate, and the first wear-resistant plate and the second wear-resistant plate are respectively inserted into the corresponding mounting grooves.

[0013] Furthermore, baffles are fixedly connected to both the first wear-resistant plate and the second wear-resistant plate on the partition. The height of the baffles is lower than the bottom height of the first wear-resistant plate and the second wear-resistant plate. The baffles abut against the side of the first wear-resistant plate or the second wear-resistant plate near the discharge end of the tank.

[0014] Furthermore, the first and second wear-resistant plates are made of wear-resistant white cast iron with the grade KmTBCr26.

[0015] The positive effects of this utility model are:

[0016] This utility model includes a trough, a first wear-resistant plate, and a second wear-resistant plate. When either the first or second wear-resistant plate wears, it only needs to be pulled out of the trough and replaced, without replacing the entire trough. Furthermore, since the first and second wear-resistant plates are spaced apart and perpendicular to the inner wall of the trough, it is not necessary to cover the entire inner wall of the trough, thus significantly reducing the amount of wear-resistant metal used and consequently lowering the operation and maintenance costs of the charging chute. Because the furnace charge only contacts the inner sides of the first and second wear-resistant plates during the sliding process, it does not cause wear on the trough. This also reduces the area of ​​heat conduction between the first and second wear-resistant plates and between the second and second wear-resistant plates, thereby reducing the heat transferred from the furnace charge to the trough. This prevents the trough from overheating and reducing its strength and rigidity, and prevents deformation due to high temperatures. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-section of this utility model;

[0018] Figure 2 This is a schematic diagram of the longitudinal section of this utility model;

[0019] Figure 3 yes Figure 2 A magnified view of a section of the central I area;

[0020] In the picture:

[0021] 1. Air cover; 2. Connecting hole; 3. Channel; 4. First wear-resistant plate; 5. Mounting slot; 6. Second wear-resistant plate; 7. Rib plate; 8. Air duct; 9. Air chamber; 10. Air hole; 11. Partition plate; 12. Baffle strip. Detailed Implementation

[0022] For ease of description, in the following description, the direction that is consistent with the length direction of the tank body 3 is "longitudinal", and the direction that is perpendicular to the length direction of the tank body 3 in the horizontal direction is "transverse".

[0023] Example 1

[0024] like Figures 1 to 3As shown, a blast furnace ironmaking charging chute includes a trapezoidal cross-section trough 3 and several wear-resistant plates distributed longitudinally along the trough 3. The left side of the trough 3 is the discharge end, and the right side is the inlet end. All wear-resistant plates are detachably connected to the inner wall of the trough 3, and are perpendicular to the inner wall of the trough 3. The wear-resistant plates are arranged transversely (i.e., both end faces of the wear-resistant plates are arranged transversely). Each wear-resistant plate includes a first wear-resistant plate 4 with a trapezoidal inner side and a second wear-resistant plate 6 with an arc-shaped inner side. The first wear-resistant plate 4 is near the discharge end of the trough 3, and the second wear-resistant plate 6 is near the inlet end of the trough 3. The bottom of the arc-shaped inner side of the second wear-resistant plate 6 is higher than the bottom of the inner side of the first wear-resistant plate 4. This height difference is t, which satisfies 5 ≤ ​​t ≤ 10 mm, preferably 8 mm, thus ensuring that the furnace charge falling from the inlet end smoothly slides to the discharge end.

[0025] The inner sidewall of the groove 3 is provided with mounting grooves 5 at positions corresponding to the first wear-resistant plate 4 or the second wear-resistant plate 6, and the first wear-resistant plate 4 and the second wear-resistant plate 6 are respectively inserted into the corresponding mounting grooves 5.

[0026] A baffle 12 is welded to one side of the first wear-resistant plate 4 and the second wear-resistant plate 6 on the partition 11. The height of the baffle 12 is lower than the height of the bottom of the first wear-resistant plate 4 and the second wear-resistant plate 6. The baffle 12 abuts against the side of the first wear-resistant plate 4 or the second wear-resistant plate 6 near the discharge end of the trough 3 to prevent the bottom of the first wear-resistant plate 4 or the second wear-resistant plate 6 from deforming due to the force of the sliding of the furnace charge.

[0027] In actual operation, the right end of the charging chute is higher than the left end. The high-temperature charge falls from the right side of the trough 3 onto the second wear-resistant plate 6, accumulating at its bottom. The arc-shaped surface of the second wear-resistant plate 6 acts as a buffer, reducing the direct impact of the charge on it. The charge then slides from right to left across each of the second wear-resistant plates 6 and each of the first wear-resistant plates 4, before falling from the left end of the trough 3 into the blast furnace cavity. Because the bottom inner side of the first wear-resistant plate 4 is flat, the passing charge is dispersed, resulting in a wider and flatter accumulation point within the furnace cavity. This slows the charge flow rate, further dispersing the charge distribution within the furnace and improving the gas utilization coefficient.

[0028] During the sliding process, the furnace charge only contacts the inner side of the first wear-resistant plate 4 and the second wear-resistant plate 6, thereby reducing the area of ​​heat conduction between the first wear-resistant plate 4 and the tank 3 and between the second wear-resistant plate 6 and the tank 3. This reduces the heat transferred from the furnace charge to the tank 3, thereby preventing the temperature of the tank 3 from becoming too high and causing a decrease in strength and rigidity, and preventing the tank 3 from deforming due to high temperature.

[0029] When the first wear-resistant plate 4 or the second wear-resistant plate 6 wears out, it is only necessary to pull the first wear-resistant plate 4 or the second wear-resistant plate 6 out of the mounting groove 5 and replace the first wear-resistant plate 4 or the second wear-resistant plate 6, without having to replace the trough body 3. In addition, since the first wear-resistant plate 4 and the second wear-resistant plate 6 are spaced apart and perpendicular to the inner wall of the trough body 3, it is not necessary to cover the entire inner wall of the trough body 3, thereby greatly reducing the amount of wear-resistant metal used, and thus reducing the operation and maintenance costs of the fabric chute.

[0030] Because the impact force on the second wear-resistant plate 6 when the furnace charge falls from the feed end of the tank 3 is large, the spacing between the first wear-resistant plate 4 and the second wear-resistant plate 6 can be set such that the spacing between the second wear-resistant plates 6 is greater than the spacing between the first wear-resistant plates 4. Specifically, the spacing between adjacent first wear-resistant plates 4 is 80 to 120 mm, the spacing between adjacent second wear-resistant plates 6 is 50 mm, and the distance between the first wear-resistant plate 4 closest to the second wear-resistant plate 6 is 50 mm. In terms of material selection, the first and second wear-resistant plates 6 are made of wear-resistant white cast iron, specifically KmTBCr26, with a thickness of 20 mm. The tank 3 does not need to use wear-resistant materials; ordinary carbon steel is sufficient, thereby reducing manufacturing costs.

[0031] Example 2

[0032] The difference between this embodiment and Embodiment 1 is that:

[0033] The groove 3 has a rectangular mounting groove 5 at its bottom along the longitudinal direction of the groove 3. Ten rectangular stiffeners 7 are distributed laterally along the bottom of the mounting groove 5 along the groove 3. The stiffeners 7 are all arranged along the longitudinal direction of the groove 3. The top of the stiffeners 7 is covered by a rectangular partition 11. The stiffeners 7 are all welded to the partition 11. The partition 11 is sandwiched between the first wear-resistant plate 4 and the stiffeners 7 and between the second wear-resistant plate 6 and the stiffeners 7.

[0034] Because the high-temperature furnace charge slides along the inner bottom of the first wear-resistant plate 4 and the second wear-resistant plate 6, most of the heat transferred from the furnace charge to the first wear-resistant plate 4 and the second wear-resistant plate 6 is concentrated at the bottom of the first wear-resistant plate 4 and the second wear-resistant plate 6, resulting in the highest temperature at the bottom of the first wear-resistant plate 4 and the second wear-resistant plate 6. This heat is then transferred to the partition plate 11. The addition of the stiffener 7 reduces the heat transfer area between the partition plate 11 and the tank body 3, thereby further reducing the heat transferred from the high-temperature furnace charge to the tank body 3, and further lowering the temperature of the tank body 3.

[0035] Example 3

[0036] The difference between this embodiment and Embodiment 2 is that:

[0037] The partition 11 and the bottom of the mounting groove 5 form a closed space. The stiffening plate 7 divides this space into nine strip-shaped air ducts 8. All air ducts 8 are arranged longitudinally along the groove 3. The air in the air ducts 8 flows longitudinally along the groove 3.

[0038] The bottom of the trough 3 is provided with two U-shaped wind hoods 1. The two wind hoods 1 are located near the two ends of the trough 3 respectively. Both wind hoods 1 are arranged horizontally. The interior of both wind hoods 1 is a closed air chamber 9. The two wind hoods 1 are located at the two ends of the air duct 8 respectively. The two ends of each air duct 8 are connected to the corresponding air chamber 9 through the connecting hole 2. The bottom of both wind hoods 1 is provided with air holes 10 with internal threads. The two air holes 10 are connected to the corresponding air chamber 9 respectively.

[0039] One of the air vents 10 is connected to the compressed air pipeline in the workshop via a pipe, while the other air vent 10 is open to the outside atmosphere. Compressed air passes through the corresponding air vent 10 and air chamber 9 in sequence, and then enters the corresponding air duct 8 through the corresponding connecting hole 2. It then flows longitudinally along the air duct 8 to the other end of the air duct 8, and then enters the corresponding air chamber 9 through the corresponding connecting hole 2, and is discharged from the other air vent 10, thereby cooling the stiffener 7. The heat is further transferred to the tank body 3 through the stiffener 7, thereby further reducing the temperature of the tank body 3.

[0040] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A blast furnace ironmaking charging chute, characterized in that, The system includes a trapezoidal cross-section trough (3) and several wear-resistant plates distributed longitudinally along the trough (3). The wear-resistant plates are detachably connected to the inner wall of the trough (3). The wear-resistant plates are perpendicular to the inner wall of the trough (3) and are arranged transversely. The wear-resistant plates include a first wear-resistant plate (4) with a trapezoidal inner side and a second wear-resistant plate (6) with an arc-shaped inner side. The first wear-resistant plate (4) is close to the discharge end of the trough (3), and the second wear-resistant plate (6) is close to the inlet end of the trough (3). The bottom of the arc-shaped surface on the second wear-resistant plate (6) is flush with the bottom of the inner side of the first wear-resistant plate (4), or the bottom of the arc-shaped surface on the second wear-resistant plate (6) is higher than the bottom of the inner side of the first wear-resistant plate (4).

2. The blast furnace ironmaking charging chute according to claim 1, characterized in that, The groove (3) has an installation groove (5) at its bottom along the longitudinal direction of the groove (3). The bottom of the installation groove (5) has several reinforcing ribs (7) distributed transversely along the groove (3). The reinforcing ribs (7) are all arranged along the longitudinal direction of the groove (3). The top of the reinforcing ribs (7) is covered by a partition (11). One of the groove (3) and the partition (11) is fixedly connected to the reinforcing rib (7). The partition (11) is sandwiched between the first wear-resistant plate (4) and the reinforcing rib (7) and between the second wear-resistant plate (6) and the reinforcing rib (7).

3. The blast furnace ironmaking charging chute according to claim 2, characterized in that, The partition (11) and the bottom of the mounting groove (5) form a closed space. The stiffening plate (7) divides the space into several air ducts (8). The air ducts (8) are all arranged longitudinally along the groove (3). The air in the air ducts (8) flows longitudinally along the groove (3).

4. The blast furnace ironmaking charging chute according to claim 3, characterized in that, The bottom of the trough (3) is provided with two wind hoods (1), which are located near the two ends of the trough (3). Both wind hoods (1) are arranged horizontally, and the interior of each wind hood (1) is a wind chamber (9). The two wind hoods (1) are located at the two ends of the air duct (8), and the two ends of each air duct (8) are connected to the corresponding wind chamber (9). The bottom of each wind hood (1) is provided with air holes (10), which are connected to the corresponding wind chamber (9).

5. A blast furnace ironmaking charging chute according to claim 1, characterized in that, The inner wall of the groove (3) is provided with mounting grooves (5) at positions corresponding to the first wear-resistant plate (4) or the second wear-resistant plate (6), and the first wear-resistant plate (4) and the second wear-resistant plate (6) are respectively inserted into the corresponding mounting grooves (5).

6. A blast furnace ironmaking charging chute according to claim 2, characterized in that, A baffle (12) is fixedly connected to one side of the first wear-resistant plate (4) and the second wear-resistant plate (6) on the partition (11). The height of the baffle (12) is lower than the height of the bottom of the first wear-resistant plate (4) and the second wear-resistant plate (6). The baffle (12) abuts against the side of the first wear-resistant plate (4) or the second wear-resistant plate (6) near the discharge end of the tank (3).

7. The blast furnace ironmaking charging chute according to claim 1, characterized in that, The first wear-resistant plate (4) and the second wear-resistant plate (6) are made of wear-resistant white cast iron with the grade KmTBCr26.

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