Grid support heat insulation type blast furnace distribution chute

Abstract

This application relates to the field of charging chute technology, specifically disclosing a grid-supported, heat-insulating blast furnace charging chute. The grid support layer provides a rigid support platform for the wear-resistant liner. The first and second wear-resistant liners are detachably installed through a connecting structure, and the liner is pressed and fixed to the grid support layer with abutment parts. This design allows for independent replacement of the first and second wear-resistant liners in the high-wear area of ​​the feed end, while retaining the third wear-resistant liner in the low-wear area of ​​the discharge end. This significantly improves the utilization rate of liner materials. At the same time, the sliding bonding structure reserves a certain thermal expansion gap, eliminating the thermal stress generated by traditional welding, thereby eliminating the risk of liner detachment.

Description

Technical Field

[0001] This application relates to the field of charging chute technology, and in particular to a grid-supported heat-insulating blast furnace charging chute. Background Technology

[0002] As a core conveying device in modern steelmaking, the blast furnace charging chute is installed below the rotating device on the top of the blast furnace. It is responsible for precisely distributing high-temperature furnace materials such as sinter and coke to specific areas inside the furnace. By adjusting the chute's inclination angle and rotation speed, it achieves spiral and annular charging patterns, directly determining the airflow distribution, heat exchange efficiency, and molten iron quality within the furnace. It is a core piece of equipment ensuring continuous production in large blast furnaces and is widely used in the intelligent ironmaking processes of major steel companies worldwide.

[0003] As the core load-bearing skeleton of the blast furnace charging chute, the grid support structure replaces the traditional solid base plate with a three-dimensional mesh frame, which significantly reduces the cross-sectional area of ​​the heat conduction path while ensuring structural rigidity. The grid support structure is usually fixed to the wear-resistant liner by welding. The wear-resistant liner is fixed to the grid intersection nodes by intermittent fillet welds. Each liner has no less than 8 welding points, and the strength of the welds is relied on to resist the impact load of the furnace charge.

[0004] However, the welding fixing method will expose fundamental defects under high-frequency thermal cycling: the impact of high-temperature furnace charge will cause the surface of the liner to heat up to a high temperature instantly, while the temperature of the grid support structure due to the heat insulation layer is much lower than that of the liner surface. The temperature difference between the two causes a huge expansion difference. This expansion difference generates tensile stress at the weld point that far exceeds the yield strength of the steel weld, causing plastic deformation of the weld and cracking along the weld toe. As a result, the connection stability between the wear-resistant liner and the grid support structure is greatly reduced, which can easily cause the wear-resistant liner to fall directly off the grid support structure. The detached wear-resistant liner will rush into the furnace at high speed with the furnace charge, causing a safety production accident. Utility Model Content

[0005] In order to overcome the problems of uncontrolled thermal expansion due to the large temperature difference between the liner and the grid support structure in traditional grid-supported chutes, liner detachment caused by excessive tensile stress at welding points, and frequent furnace shutdown accidents caused by these problems, this application provides a grid-supported heat-insulating blast furnace charging chute.

[0006] This application provides a grid-supported, heat-insulating blast furnace charging chute, employing the following technical solution:

[0007] A grid-supported heat-insulating blast furnace charging chute includes a charging chute body. A grid support layer is provided on the bottom wall of the charging chute body. On the side of the grid support layer away from the bottom wall of the charging chute body, a first wear-resistant liner, a second wear-resistant liner, and a third wear-resistant liner are sequentially installed from near the feed end to away from the feed end. The first wear-resistant liner and the second wear-resistant liner are detachably installed on the charging chute body, and both are provided with a connection structure between themselves and the charging chute body.

[0008] The first wear-resistant liner and the second wear-resistant liner are slidably attached to the mesh support layer. The fabric chute body is provided with multiple sets of abutment members for abutting and fixing the first wear-resistant liner and the second wear-resistant liner to the mesh support layer. The third wear-resistant liner is fixed to the mesh support layer.

[0009] By adopting the above technical solution, the grid support layer provides a rigid support platform for the wear-resistant liner. The first and second wear-resistant liners are detachably installed through a connecting structure, and the liner is pressed and fixed to the grid support layer with the abutment component. This design allows for independent replacement of the first and second wear-resistant liners in the high-wear area of ​​the feed end, while retaining the third wear-resistant liner in the low-wear area of ​​the discharge end. This significantly improves the utilization rate of liner materials. At the same time, the sliding bonding structure reserves a certain thermal expansion gap to eliminate the thermal stress generated by traditional welding, thereby eliminating the risk of liner detachment.

[0010] Optionally, the connection structure includes snap-fit ​​grooves corresponding to the first wear-resistant liner and the second wear-resistant liner, which are opened on the side wall of the fabric chute body. Each snap-fit ​​groove penetrates the top of the fabric chute body and extends to the side wall of the corresponding first wear-resistant liner and the second wear-resistant liner. Each side wall of the first wear-resistant liner and the second wear-resistant liner is fixed with a snap-fit ​​block, which is slidably snapped into the corresponding snap-fit ​​groove.

[0011] By adopting the above technical solution, the snap-fit ​​groove and the snap-fit ​​blocks on the side walls of the first wear-resistant liner and the second wear-resistant liner form an axial sliding channel. When replacing the first wear-resistant liner and the second wear-resistant liner, the snap-fit ​​blocks are inserted / pulled out vertically along the snap-fit ​​groove. This plug-in structure greatly shortens the replacement time of a single liner and eliminates the need for hot work, thus completely avoiding the problem of substrate deformation caused by the heat-affected zone.

[0012] Optionally, the abutting member includes an abutting part and a limiting part. The abutting part is adapted to the snap-fit ​​groove and is used to abut the snap-fit ​​block. A limiting groove is provided outside the snap-fit ​​groove. The limiting part is adapted to the limiting groove and is used to limit the abutting part.

[0013] By adopting the above technical solution, the abutting part is embedded in the snap-fit ​​groove to press the snap-fit ​​block, and the limiting part locks the position of the abutting part in the limiting groove. This dual constraint mechanism provides constant clamping force under high temperature conditions, allowing the first wear-resistant liner and the second wear-resistant liner to expand radially while suppressing vibration displacement, thus greatly improving the impact resistance.

[0014] Optionally, the top of the abutment is flush with the fabric chute body, and the top of the abutment is fixed with a lifting handle for removing the abutment from the fabric chute body.

[0015] By adopting the above technical solution, the design of the lifting handle being flush with the top surface of the abutment part enables tool-free operation: maintenance personnel can directly lift the handle to release the abutment constraint. This structure greatly reduces the disassembly process of the first wear-resistant liner and the second wear-resistant liner, and significantly reduces the input of manpower.

[0016] Optionally, a limiting plate is fixed on the inner bottom wall of the fabric chute body near the discharge end. The limiting plate can be used to limit the end of the mesh support layer near the discharge end of the fabric chute body.

[0017] By adopting the above technical solution, the limiting plate forms a mechanical stop at the discharge end of the fabric chute body, thereby limiting and fixing the end of the grid support layer.

[0018] Optionally, both ends of the mesh support layer are fixed with filling seats for covering the mesh and making the ends of the fabric chute body flush.

[0019] By adopting the above technical solution, the filling seat seals the openings at both ends of the grid support layer, thereby making the structure of the grid support layer more stable and also making the end of the fabric chute body form an integral plane.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] This application achieves rapid replacement of liners in high-wear areas through the sliding cooperation of a segmented and detachable liner structure with a grid support layer: operators can complete the replacement of a single liner in a short time, greatly improving replacement efficiency and material utilization; in conjunction with the elastic compression mechanism of the abutment, a certain thermal expansion gap is reserved between the liner and the grid support layer, which greatly reduces the peak thermal stress, completely eliminates the detachment accident caused by weld cracking, and extends the service life of the liner;

[0022] This application utilizes a limiting plate to perform precise hard positioning of the grid support layer, while the filling seat seals the grid ends to form a continuous smooth curved surface, preventing high-temperature debris from entering the grid cavity, reducing eddy current wear, improving impact load resistance, and reducing the maintenance cost of the equipment throughout its entire life cycle. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of a mesh-supported heat-insulating blast furnace charging chute in an embodiment of this application;

[0025] Figure 2 yes Figure 1 A partial exploded structural diagram of a mesh-supported, heat-insulated blast furnace charging chute.

[0026] Figure 3 yes Figure 2 A partial structural diagram of a mesh-supported, heat-insulating blast furnace charging chute;

[0027] Figure 4 yes Figure 3 Schematic diagram of the structure at the middle grid support layer;

[0028] Figure 5 yes Figure 3 A schematic diagram of the structure of the middle abutment component.

[0029] Reference numerals: 1. Fabric chute body; 11. Mesh support layer; 12. Limiting groove; 13. Lifting handle; 14. Limiting plate; 2. First wear-resistant liner; 3. Second wear-resistant liner; 4. Third wear-resistant liner; 5. Snap-fit ​​groove; 6. Connecting structure; 7. Abutting part; 71. Abutting part; 72. Limiting part; 8. Locking block; 9. Filler seat. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail below.

[0031] This application discloses a grid-supported, heat-insulating blast furnace charging chute.

[0032] Reference Figure 1 , Figure 2 and Figure 3 A grid-supported heat-insulating blast furnace charging chute includes a charging chute body 1. A grid support layer 11 is provided on the inner bottom wall of the charging chute body 1. On the side of the grid support layer 11 away from the inner bottom wall of the charging chute body 1, a first wear-resistant liner 2, a second wear-resistant liner 3 and a third wear-resistant liner 4 are installed sequentially from near the feed end to away from the feed end. The first wear-resistant liner 2 and the second wear-resistant liner 3 are detachably installed on the charging chute body 1, and a connection structure 6 is provided between them and the charging chute body 1.

[0033] Reference Figure 2 and Figure 3 The first wear-resistant liner 2 and the second wear-resistant liner 3 are slidably attached to the grid support layer 11. The fabric chute body 1 is provided with multiple sets of abutment members 7 for abutting and fixing the first wear-resistant liner 2 and the second wear-resistant liner 3 to the grid support layer 11. The third wear-resistant liner 4 is fixed to the grid support layer 11.

[0034] The grid support layer 11 provides a rigid support platform for the wear-resistant liner. The first wear-resistant liner 2 and the second wear-resistant liner 3 are detachably installed through the connecting structure 6, and are pressed and fixed to the grid support layer 11 with the abutment part 7. This design allows for independent replacement of the first and second wear-resistant liners 3 in the high-wear area of ​​the feed end, while retaining the third wear-resistant liner 4 in the low-wear area of ​​the discharge end. This significantly improves the utilization rate of the liner material. At the same time, the sliding bonding structure reserves a certain thermal expansion gap to eliminate the thermal stress generated by traditional welding, thereby eliminating the risk of liner detachment.

[0035] Reference Figure 2 and Figure 3 The connecting structure 6 includes a snap-fit ​​groove 5 on the side wall of the fabric chute body 1 corresponding to the first wear-resistant liner 2 and the second wear-resistant liner 3. Each snap-fit ​​groove 5 penetrates the top of the fabric chute body 1 and extends to the side wall of the corresponding first wear-resistant liner 2 and the second wear-resistant liner 3. Each side wall of the first wear-resistant liner 2 and the second wear-resistant liner 3 is fixed with a snap-fit ​​block 8, which slides and snaps into the corresponding snap-fit ​​groove 5.

[0036] The snap-fit ​​groove 5 forms an axial sliding channel with the snap-fit ​​blocks 8 on the side walls of the first wear-resistant liner 2 and the second wear-resistant liner 3. When replacing the first wear-resistant liner 2 and the second wear-resistant liner 3, the snap-fit ​​blocks 8 are inserted / pulled out vertically along the snap-fit ​​groove 5. This plug-in structure greatly shortens the replacement time of a single liner and eliminates the need for hot work, thus completely avoiding the problem of substrate deformation caused by the heat-affected zone.

[0037] Reference Figure 3 , Figure 4 and Figure 5 The abutting member 7 includes an abutting part 71 and a limiting part 72. The abutting part 71 is adapted to the snap-fit ​​groove 5 and is used to abut the snap-fit ​​block 8. The snap-fit ​​groove 5 is externally connected to a limiting groove 12. The limiting part 72 is adapted to the limiting groove 12 and is used to limit the abutting part 71.

[0038] The abutting part 71 is embedded in the snap-fit ​​groove 5 to press the snap-fit ​​block 8, and the limiting part 72 locks the position of the abutting part 71 in the limiting groove 12. This dual constraint mechanism provides constant clamping force under high temperature conditions, allowing the first wear-resistant liner 2 and the second wear-resistant liner 3 to expand radially while suppressing vibration displacement, and greatly improving the impact resistance.

[0039] Reference Figure 3 The top of the abutment 7 is flush with the fabric chute body 1, and the top of the abutment 7 is fixed with a lifting handle 13 for removing the abutment 7 from the fabric chute body 1.

[0040] The design of the lifting handle 13 being flush with the top surface of the abutment 7 enables tool-free operation: maintenance personnel can directly lift the handle to release the abutment constraint. This structure greatly reduces the disassembly process of the first wear-resistant liner 2 and the second wear-resistant liner 3, significantly reducing the input of manpower.

[0041] Reference Figure 3 A limiting plate 14 is fixed on the inner bottom wall of the fabric chute body 1 near the discharge end. The limiting plate 14 can be used to limit the end of the mesh support layer 11 near the discharge end of the fabric chute body 1.

[0042] The limiting plate 14 forms a mechanical stop at the discharge end of the fabric chute body 1, thereby limiting and fixing the end of the grid support layer 11.

[0043] Reference Figure 4 Both ends of the mesh support layer 11 are fixed with filling seats 9 for covering the mesh and making the ends of the fabric chute body 1 flush.

[0044] The filling seat 9 seals the openings at both ends of the grid support layer 11, thereby making the structure of the grid support layer 11 more stable and also making the end of the fabric chute body 1 form an integral plane.

[0045] The implementation principle of a grid-supported heat-insulating blast furnace charging chute in this application embodiment is as follows: when the operator replaces the liner at the charging end, he holds the lifting handle 13 and lifts the abutment 7 vertically to release the constraint, and then pulls the worn liner out along the axial direction of the locking groove 5.

[0046] The new liner is inserted by aligning the side wall locking block 8 with the locking groove 5 and pushing the liner until it contacts the limiting plate 14 to complete the positioning. At this time, the abutment 7 is pressed down, and its abutment part 71 presses against the locking block 8. The limiting part 72 automatically engages with the side wall limiting groove 12 to lock, thus realizing the quick replacement of the liner.

[0047] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A grid-supported, heat-insulating blast furnace charging chute, characterized in that: The fabric chute body (1) includes a mesh support layer (11) on the inner bottom wall of the fabric chute body (1). On the side of the mesh support layer (11) away from the inner bottom wall of the fabric chute body (1), a first wear-resistant liner (2), a second wear-resistant liner (3) and a third wear-resistant liner (4) are installed sequentially from near the feed end to away from the feed end. The first wear-resistant liner (2) and the second wear-resistant liner (3) are detachably installed on the fabric chute body (1) and are connected to the fabric chute body (1) by a connection structure (6). The first wear-resistant liner (2) and the second wear-resistant liner (3) are slidably attached to the mesh support layer (11). The fabric chute body (1) is provided with multiple sets of abutment members (7) for abutting and fixing the first wear-resistant liner (2) and the second wear-resistant liner (3) to the mesh support layer (11). The third wear-resistant liner (4) is fixed to the mesh support layer (11).

2. The grid-supported heat-insulating blast furnace charging chute according to claim 1, characterized in that: The connection structure (6) includes snap-fit ​​grooves (5) on the side wall of the fabric chute body (1) corresponding to the first wear-resistant liner (2) and the second wear-resistant liner (3). Each snap-fit ​​groove (5) penetrates the top of the fabric chute body (1) and extends to the side wall corresponding to the first wear-resistant liner (2) and the second wear-resistant liner (3). Each side wall of the first wear-resistant liner (2) and the second wear-resistant liner (3) is fixed with a snap-fit ​​block (8), which slides and snaps into the corresponding snap-fit ​​groove (5).

3. The grid-supported heat-insulating blast furnace charging chute according to claim 2, characterized in that: The abutting member (7) includes an abutting part (71) and a limiting part (72). The abutting part (71) is adapted to the snap-fit ​​groove (5) and is used to abut the snap-fit ​​block (8). The snap-fit ​​groove (5) is externally connected to a limiting groove (12). The limiting part (72) is adapted to the limiting groove (12) and is used to limit the abutting part (71).

4. The grid-supported heat-insulating blast furnace charging chute according to claim 2, characterized in that: The top of the abutment (7) is flush with the fabric chute body (1), and the top of the abutment (7) is fixed with a lifting handle (13) for removing the abutment (7) from the fabric chute body (1).

5. The grid-supported heat-insulating blast furnace charging chute according to claim 1, characterized in that: A limiting plate (14) is fixed on the inner bottom wall of the fabric chute body (1) near the discharge end. The limiting plate (14) can be used to limit the end of the mesh support layer (11) near the discharge end of the fabric chute body (1).

6. The grid-supported heat-insulating blast furnace charging chute according to claim 1, characterized in that: Both ends of the mesh support layer (11) are fixed with filling seats (9) for covering the mesh and making the ends of the fabric chute body (1) flush.

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