Blast furnace slag flushing water chute and wear-resistant lining for chute
By introducing a wear-resistant lining and wire mesh structure into the blast furnace slag flushing water chute, the problems of easy damage and difficult maintenance of the blast furnace slag flushing water chute have been solved, achieving efficient preventive maintenance and low-cost production continuity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGXI ZHONGJIN METAL TECH CO LTD
- Filing Date
- 2026-01-20
- Publication Date
- 2026-04-21
AI Technical Summary
The existing blast furnace slag flushing water chute has poor overall structure, the lining is easily worn and damaged, maintenance is difficult and costly, and frequent shutdowns for repairs affect the continuity of production.
A blast furnace slag flushing water chute is designed, comprising, from the outside to the inside, a dry slag layer, an ordinary concrete layer, a water slag cast iron lining layer, and a wear-resistant lining layer. The wear-resistant lining layer is a high-strength composite material with serrated protrusions and wire mesh to enhance the bonding force. The arc-shaped bottom of the chute guides the slag water flow to form a stable vortex flow, reducing sidewall wear and enabling local repairs to be completed within 36 hours.
It increases the service life of chutes by 2-3 times, reduces annual maintenance costs by 10%, enables preventive maintenance, reduces maintenance frequency and costs, ensures production continuity, and has excellent structural crack resistance and integrity.
Smart Images
Figure CN121896402A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of blast furnace equipment technology, and in particular to a water chute for blast furnace slag flushing and a wear-resistant lining for the chute. Background Technology
[0002] 1. Slag granulation is one of the important processes in ironmaking production lines. The slag granulation process involves rapidly cooling and crushing the liquid molten slag, which is produced during blast furnace smelting at a temperature as high as 1450-1550℃, with water at a certain pressure and flow rate when it is discharged. This causes the molten slag to vitrify and form fine, uniform particles with potential hydraulic cementing properties. The mixture of water and slag then flows into the slag pool.
[0003] 2. Existing technological deficiencies and cost issues Traditional slag flushing chutes typically employ a steel plate frame lined with wear-resistant cast iron plates or a dry slag layer + concrete layer and a cast iron slag lining, as shown in the attached diagram. Figure 1 As shown, the following prominent defects exist in actual operation: 1) Maintenance is extremely difficult and costly: (1) The maintenance window is extremely short: the blast furnace production line can only arrange a shutdown window of about 36 hours every three months in conjunction with the maintenance of the iron trough. During daily operation, no effective treatment can be carried out on the chute, which causes small damage to quickly expand into structural damage.
[0004] (2) Huge replacement costs: Taking a blast furnace as an example, all 136 cast iron liners need to be replaced during the annual overhaul. The cost of spare parts alone is as high as RMB 1.36 million. At the same time, additional costs such as labor and hoisting are incurred, amounting to RMB 500,000. The total cost of a single maintenance is nearly RMB 1.86 million.
[0005] (3) Serious production losses: Frequent shutdowns for maintenance directly affect the stable operation and production continuity of the blast furnace, resulting in huge indirect economic losses.
[0006] 2) Severe abrasive wear: The high-speed flowing slag-water mixture contains a large number of hard slag particles, which continuously scour the inner wall of the trench, especially at the bottom and turning parts, causing the lining to wear thin and perforate rapidly.
[0007] 3) Poor structural integrity: Existing lining grooves are mostly installed by splicing, and the joints are easy to become the breakthrough point of wear and tear. Local damage spreads rapidly, resulting in exposure of the concrete matrix and corrosion of the steel bars.
[0008] Therefore, there is an urgent need to design a new type of chute structure to reverse this passive situation. Summary of the Invention
[0009] The technical problem to be solved by the present invention is to provide a blast furnace slag flushing water chute and a wear-resistant lining for the chute, which can solve the problems of poor overall structure of existing blast furnace slag flushing water chutes, easy wear and damage of the chute lining, difficult maintenance and high cost.
[0010] To solve the above problems, the technical solution of the present invention is: the blast furnace slag flushing water chute includes a dry slag layer, an ordinary concrete layer, a water slag cast iron lining layer and a wear-resistant lining layer arranged sequentially from the outside of the chute body to the inside.
[0011] The height of the ordinary concrete layer and the water slag cast iron lining is lower than that of the dry slag layer but higher than that of the wear-resistant lining; the wear-resistant lining is set at the bottom of the water chute, and the bottom of the cross-section of the wear-resistant lining is arc-shaped with a radius R satisfying: 200mm≤R≤400mm; the arc-shaped bottom of the chute is used to guide the slag-water mixture to form a stable central vortex flow, so that high-density, large-particle slag particles are concentrated in the central area of the bottom of the chute, reducing the impact and wear on the sidewalls; the wear-resistant lining is provided with serrated protrusions extending along the water flow direction; when the wear-resistant lining is cast, a wire mesh is laid between the wear-resistant lining and the water slag cast iron lining to increase the bonding force and strength of the two linings.
[0012] A more specific solution to the above technical solution is that the wire mesh is fixed to the inner surface of the frame of the slag cast iron lining by multi-point welding, ensuring that the wear-resistant lining and the slag cast iron lining are integrated into a whole, effectively preventing the lining from peeling off, and uniformly distributing local impact loads.
[0013] Furthermore: the wear-resistant lining is a high-strength composite wear-resistant lining; the casting thickness of the high-strength composite wear-resistant lining is 80-150mm.
[0014] A wear-resistant lining for a chute according to any one of claims 1-3 is formed by mixing and casting high-strength concrete and iron filings filler, wherein the mass ratio of the high-strength concrete to the iron filings filler is 1:(0.2~0.8). This ratio range ensures that the material has both extremely high compressive strength and wear resistance, as well as good workability and rapid curing characteristics, meeting the process requirements for completing repairs within a 36-hour maintenance period. Furthermore: the mass ratio of the high-strength concrete to the iron filings filler is 1:(0.3~0.6); the strength grade of the high-strength concrete is not lower than C60.
[0015] Furthermore: the iron filings filler is cast iron filings and / or steel filings, and the particle size of the cast iron filings and / or steel filings is 1-10 mm.
[0016] By adopting the above technical solution, the present invention has the following advantages compared with the prior art: 1. Ultra-long service life and extremely low maintenance frequency: By using the design concept of "guided wear" and the application of ultra-high wear-resistant materials, wear is concentrated in the repairable reinforced area, which can increase the overall service life of the chute by more than 2-3 times and significantly reduce the number of annual maintenance.
[0017] 2. Significantly reduced maintenance costs: The old model of replacing 136 cast iron liners annually has been eliminated. After wear, only the central area needs to be repaired with low-cost material backfilling. The material and labor costs for a single repair are less than 10% of the traditional replacement model, and the annual maintenance cost can be reduced from about 1.86 million yuan to less than 200,000 yuan.
[0018] 3. Excellent maintenance compatibility: All repair work (cleaning, welding of local reinforcements, pouring, curing) is designed to be completed within the blast furnace's inherent 36-hour quarterly maintenance window, solving the industry pain point of "not being able to handle it under normal circumstances" and achieving a perfect combination of preventive maintenance and production planning.
[0019] 4. Excellent crack resistance and integrity: The integral cast-in-place structure reinforced with steel wire mesh avoids the weak points of the joints of traditional assembled lining plates, has strong thermal shock resistance and impact resistance, and prevents local damage from spreading rapidly.
[0020] 5. High compatibility and return on investment: It can be directly modified and implemented on the basis of the original chute frame without changing the main process, with low initial investment and short investment recovery period. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of a slag flushing tank in existing technology.
[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the slag flushing tank of the present invention.
[0023] Figure 3 yes Figure 2 A schematic diagram of a cross section along section AA.
[0024] The labels in the diagram represent: 1. Dry slag layer; 2. Ordinary concrete layer; 3. Water slag cast iron lining layer; 4. Wear-resistant lining layer; 4-1. Serrated protrusion; 5. Wire mesh. Detailed Implementation
[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: Figure 2 and Figure 3 A blast furnace slag flushing water chute includes, from the outside of the chute body inwards, a dry slag layer 1, an ordinary concrete layer 2, a water slag cast iron lining layer 3, and a wear-resistant lining layer 4.
[0026] The distance between the inner surfaces of the dry slag layer 1 on both sides of the water chute is 1010 mm, and the distance from the upper surface of the dry slag layer 1 at the bottom of the chute to the top of the dry slag layer 1 is 1800 mm.
[0027] The ordinary concrete layer 2 and the slag cast iron liner 3 are lower than the dry slag layer 1 but higher than the wear-resistant liner 4. The wear-resistant liner 4 is set at the bottom of the chute, with a circular arc bottom cross-section and a radius R satisfying: 200mm ≤ R ≤ 400mm. The circular arc bottom guides the slag-water mixture to form a stable central vortex flow, causing high-density, large-particle slag to concentrate in the central area of the chute bottom, reducing the impact and wear on the sidewalls. The wear-resistant liner 4 is provided with serrated protrusions 4-1 extending along the water flow direction. The serrated protrusions 4-1 are used to disrupt the laminar boundary layer near the sidewall, forming a turbulent buffer zone, significantly reducing the tangential velocity of the water flow near the sidewall and the shear force on the wall surface, achieving the ideal flow field distribution of "slow flow on both sides and rapid flow in the center". During the casting of the wear-resistant liner 4, a fixed wire mesh 5 is laid between the wear-resistant liner 4 and the slag cast iron liner 3 to increase the bonding force and strength of the two liner layers. The wire mesh 5 is fixed to the inner surface of the slag cast iron liner 3 frame by multi-point welding, ensuring that the wear-resistant liner 4 and the slag cast iron liner 3 are integrated into a whole, effectively preventing the liner from peeling off and uniformly distributing local impact loads.
[0028] The wear-resistant lining 4 is a high-strength composite wear-resistant lining. This high-strength composite wear-resistant lining is cast from a mixture of high-strength concrete and iron filings filler, with a mass ratio of 1:(0.2~0.8). This ratio ensures that the material possesses both extremely high compressive strength and wear resistance, as well as good workability and rapid curing characteristics, meeting the process requirements for completing repairs within a 36-hour maintenance period. Preferably, in this embodiment, the mass ratio is 1:(0.3~0.6). The strength grade of the high-strength concrete is not lower than C60. The iron filings filler is cast iron filings and / or steel filings, with a particle size of 1-10mm. The casting thickness of the composite wear-resistant lining is 80-150mm.
[0029] This invention ensures that when the central wear-resistant area experiences expected wear, the original structure can be removed, and localized overlay repair can be performed directly on the cleaned wear surface. The repair material is the same as the original material, the process is simple, and it can be completed and cured to reach the service strength within a 36-hour inspection window.
Claims
1. A blast furnace slag flushing water chute, comprising a dry slag layer (1), an ordinary concrete layer (2), and a water-slag cast iron lining layer (3), characterized in that: It also includes a wear-resistant lining (4); The height of the ordinary concrete layer (2) and the slag cast iron lining layer (3) is lower than that of the dry slag layer (1) but higher than that of the wear-resistant lining layer (4); the bottom of the cross-section of the wear-resistant lining layer (4) is arc-shaped, and the radius R of the arc satisfies: 200mm≤R≤400mm; the wear-resistant lining layer (4) is provided with a sawtooth protrusion (4-1); when the wear-resistant lining layer (4) is cast, a wire mesh (5) is laid between the wear-resistant lining layer (4) and the slag cast iron lining layer (3).
2. The blast furnace slag flushing water chute according to claim 1, characterized in that: The wire mesh (5) is fixed to the inner surface of the slag cast iron lining (3) by multi-point welding, so that the wear-resistant lining (4) and the slag cast iron lining (3) are integrated into a whole.
3. A blast furnace slag flushing water chute according to claim 1 or 2, characterized in that: The wear-resistant lining (4) is a high-strength composite wear-resistant lining; the casting thickness of the high-strength composite wear-resistant lining is 80-150mm.
4. A wear-resistant lining for a chute according to any one of claims 1-3, characterized in that: The wear-resistant lining is formed by mixing and casting high-strength concrete and iron filings filler, with the mass ratio of high-strength concrete to iron filings filler being 1:(0.2~0.8).
5. The wear-resistant lining for a chute according to claim 4, characterized in that: The mass ratio of the high-strength concrete to the iron filings filler is 1:(0.3~0.6); the strength grade of the high-strength concrete is not lower than C60.
6. The wear-resistant lining for a chute according to claim 5, characterized in that: The iron filings filler is cast iron filings with a particle size of 1-10 mm.
7. The wear-resistant lining for a chute according to claim 5, characterized in that: The iron filings filler is steel filings with a particle size of 1-10 mm.
8. The wear-resistant lining for a chute according to claim 5, characterized in that: The iron filings filler consists of cast iron filings and steel filings, with a particle size of 1-10 mm.