Anti-splashing residual iron discharging device for blast furnace

Abstract

The utility model relates to the technical field of blast furnace residual iron discharge, in particular to an anti-splashing residual iron discharge device of a blast furnace. The furnace comprises a furnace body, one side of the furnace body is communicated and fixedly connected with a frame main beam, the top of the frame main beam is fixedly connected with a cover plate, a residual iron runner is formed between the cover plate and the frame main beam, and the residual iron runner is in a big-end-up trapezoid shape; through cooperation of a residual iron runner, a first support and a second support, the gradient of a main beam of a frame is 3.6 degrees by arranging the first support and the second support, the residual iron runner extends to the positions of a first rail and a second rail, molten iron tanks on the two rails receive molten iron at the same time and are alternately replaced, and it is ensured that after one molten iron tank receives iron all the time and residual iron is completely discharged, the residual iron tank can be replaced. Pulling to steel-making for smelting; the two rail lines are used for tapping at the same time, the tapping efficiency is improved, thick yellow sand is laid on the ground, refractory bricks and spraying paint are laid on a ground water pipe and an instrument box for protection, and molten iron is prevented from splashing to burn out equipment and facilities.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace residual iron discharge, in particular to a blast furnace residual iron discharge device that prevents splashing. Background Art

[0002] Blast furnaces commonly used in industrial ironmaking need to be overhauled and maintained after reaching a preset service life. During the overhaul, the furnace shell needs to be cut after the furnace is shut down, the local cooling wall needs to be removed, and the residual iron at the bottom of the hearth that has not been released through the iron mouth is released. The location where the residual iron is released is called the residual iron mouth. The opening position of the residual iron mouth and the setting of the residual iron groove are the key to the success of the residual iron release. Whether more residual iron can be released more effectively, so that there is less residual iron in the furnace and the residual dead iron layer is better formed, will directly affect the subsequent blast furnace overhaul work and even affect the overall construction period of the blast furnace overhaul.

[0003] A Chinese patent with the announcement number CN202272894U discloses a blast furnace residual iron ditch. The residual iron ditch is cast in a concrete trough, with a slow-flow gate installed at the bend of the residual iron ditch and a waterless taphole mud cushion at the front nozzle of the residual iron ditch. Since the liquid level of the molten iron in the residual iron ditch is relatively low, the outflowing molten iron can be aligned with the mouth of the torpedo tank. In addition, the addition of a slow-flow gate at the bend of the residual iron ditch can effectively slow the flow rate of the molten iron and shorten the parabola length of the molten iron when it leaves the nozzle, allowing the molten iron to enter the torpedo tank directly, thereby avoiding accidents such as molten iron falling to the ground and burning the railway or torpedo tank, improving the safety factor of equipment and personnel, reducing accident losses and handling workload, reducing the labor intensity of workers, and improving the working environment. At the same time, it can significantly shorten the sand outlet time by more than half.

[0004] The current existing technology is suitable for small and medium-sized blast furnaces, but cannot meet the requirements of large blast furnaces above 4000m3 for discharging scrap iron. Since the scrap iron remaining in the furnace is 1200-2500 tons, the design and layout of the scrap iron ditch is very important. However, the selection of the scrap iron placement position and the scrap iron ditch have not been specially designed, which cannot meet the characteristics of the large amount of scrap iron in medium and large blast furnaces, thereby affecting the subsequent maintenance progress and posing serious safety hazards.

[0005] Therefore, in order to solve the above problems, a blast furnace anti-splashing residual iron discharge device is proposed. Utility Model Content

[0006] To this end, the technical problem to be solved by the present invention is to overcome the fact that the selection of the residual iron placement position and the residual iron ditch in the existing technology are not specially designed, which cannot meet the characteristics of the large amount of residual iron in medium and large blast furnaces, thereby affecting the subsequent maintenance progress and posing serious safety hazards.

[0007] In order to solve the above technical problems, the utility model provides a blast furnace anti-splash residual iron discharge device.

[0008] In one embodiment of the present invention, it includes a furnace body, one side of the furnace body is connected and fixedly connected to a frame main beam, the top of the frame main beam is fixedly connected to a cover plate, a residual iron groove is formed between the cover plate and the frame main beam, the residual iron groove is trapezoidal in shape with a larger upper part and a smaller lower part, the bottom of the frame main beam is fixedly connected to a first bracket and a second bracket in sequence, the first bracket is higher than the second bracket, and the slope between the bottom surface of the frame main beam and the ground is 3.6°; the bottom of the frame main beam is connected and fixedly connected to a first flow nozzle and a second flow nozzle in sequence, a second rail is provided below the first flow nozzle, and a first rail is provided below the second flow nozzle.

[0009] In one embodiment of the present invention, a first protective layer is fixedly connected to the inner wall of the first flow nozzle, and a second protective layer is fixedly connected to the inner wall of the second flow nozzle. The first protective layer and the second protective layer are both made of refractory clay coating, and the tops of the first protective layer and the second protective layer are both connected to the residual iron groove.

[0010] In one embodiment of the present invention, a first sleeve is connected and fixedly connected to the side wall adjacent to the first flow nozzle and the second flow nozzle, a second sleeve is connected and fixedly connected to the side wall adjacent to the first flow nozzle, an electric push rod is fixedly connected to the bottom of the frame main beam, the output end of the electric push rod is fixedly connected to a connecting plate, the bottom of the connecting plate is fixedly connected to a gate plate, the two ends of the gate plate are respectively slidably connected to the first sleeve and the second sleeve, the two ends of the gate plate are respectively matched with the first sleeve and the second sleeve; a water-free mud layer is provided in the gate plate.

[0011] In one embodiment of the present invention, a flow-reduction plate is fixedly connected to the top of the cover plate, and the height of the flow-reduction plate is greater than half the height of the residual iron groove.

[0012] In one embodiment of the present invention, a refractory brick layer is laid on the top inner wall of the frame main beam, and a castable layer is laid on the top of the refractory brick layer.

[0013] In one embodiment of the present invention, the casting material layer is provided with reinforcing ribs, and the reinforcing ribs are respectively connected to the top of the first bracket and the top of the second bracket.

[0014] In one embodiment of the present invention, a protective cover is fixedly connected to one side wall of the cover plate, and the inner wall of the protective cover is made of high-temperature resistant material.

[0015] In one embodiment of the present invention, six first molten iron tanks are slidably connected to the top of the first rail; six second molten iron tanks are slidably connected to the top of the second rail, the first molten iron tanks are respectively matched with the second spouts, and the second molten iron tanks are respectively matched with the first spouts.

[0016] The above technical solution of the utility model has the following advantages compared with the prior art:

[0017] The utility model discloses a blast furnace anti-splashing residual iron discharge device, which cooperates with the residual iron ditch, the first bracket and the second bracket. By setting the first bracket and the second bracket, the slope of the frame main beam is 3.6°, the residual iron ditch is extended to the position of the first rail and the second rail, and the molten iron tanks on the two rails receive molten iron at the same time and are replaced alternately to ensure that there is always a molten iron tank receiving iron, and after all the residual iron is discharged, it is pulled to the steelmaking for smelting; the two rail lines simultaneously produce iron, which speeds up the efficiency of iron production, and the ground is paved with thicker yellow sand, and the ground water pipes and instrument boxes are built with refractory bricks and sprayed with paint for protection to prevent molten iron from splashing and burning equipment and facilities.

[0018] The utility model describes a blast furnace anti-splashing residual iron discharge device, which cooperates with a first flow nozzle, a second flow nozzle and a gate plate to achieve alternate reception of molten iron. When the first first molten iron tank on the first rail receives the molten iron, the electric push rod is turned on, and the output end of the electric push rod drives the connecting plate to move to the right, and the connecting plate drives the gate plate to move. The gate plate slides away from the second flow nozzle in the second sleeve, and the other end blocks the first flow nozzle. The molten iron flows from the second flow nozzle to the first molten iron tank. Then, when the first second molten iron tank on the second rail receives the molten iron, the electric push rod is driven to move in the opposite direction. The electric push rod drives the gate plate to move through the connecting plate, and the gate plate moves toward the second flow nozzle to block the second flow nozzle. The molten iron flows out of the first flow nozzle into the second molten iron tank, and so on and so forth to achieve alternate reception of the molten iron. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0020] Figure 1 It is a three-dimensional diagram of the utility model;

[0021] Figure 2 It is a three-dimensional diagram of the main beam of the frame of the utility model;

[0022] Figure 3 It is a three-dimensional diagram of the cross section of the residual iron groove in the utility model;

[0023] Figure 4 It is a three-dimensional diagram of the gate plate in the utility model;

[0024] Figure 5 It is a cross-sectional view of the main beam of the frame of the present utility model;

[0025] Explanation of the reference numerals in the specification: 1. furnace body; 2. first bracket; 3. second bracket; 4. cover plate; 5. protective cover; 6. frame main beam; 7. first spout; 8. first protective layer; 9. second spout; 10. second protective layer; 11. gate; 12. residual iron groove; 13. slow flow plate; 14. connecting plate; 15. electric push rod; 16. second sleeve; 17. first sleeve; 18. castable layer; 19. refractory brick layer; 20. reinforcing rib; 21. first rail; 22. first molten iron tank; 23. second rail; 24. second molten iron tank. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0027] Reference Figure 1 - Figure 5 As shown, the utility model is a blast furnace anti-splashing residual iron discharge device, including a furnace body 1, one side of the furnace body 1 is connected and fixedly connected to a frame main beam 6, the top of the frame main beam 6 is fixedly connected to a cover plate 4, a residual iron groove 12 is formed between the cover plate 4 and the frame main beam 6, the residual iron groove 12 is a trapezoidal shape with a larger upper part and a smaller lower part, the bottom of the frame main beam 6 is fixedly connected to a first bracket 2 and a second bracket 3 in sequence, the first bracket 2 is higher than the second bracket 3, and the slope between the bottom surface of the frame main beam 6 and the ground is 3.6°; the bottom of the frame main beam 6 is connected and fixedly connected to a first flow nozzle 7 and a second flow nozzle 9 in sequence, a second rail 23 is provided below the first flow nozzle 7, and a first rail 21 is provided below the second flow nozzle 9.

[0028] In the prior art, the selection of the position for placing the residual iron and the residual iron groove 12 are not specially designed, which cannot meet the characteristics of the large amount of residual iron in medium and large blast furnaces, thereby affecting the subsequent maintenance progress and posing a serious safety hazard; during operation, the erosion situation is analyzed according to the temperature of the furnace bottom, and the erosion position of the furnace is determined to be locally on the upper part of the 5th layer of carbon bricks. By setting the first bracket 2 and the second bracket 3, the slope of the frame main beam 6 is made to be 3.6°, and the residual iron groove 12 is extended to the position of the first rail 21 and the second rail 23. The molten iron tanks on the two rails receive molten iron at the same time and are replaced alternately to ensure that there is always a molten iron tank receiving iron. After all the residual iron is released, it is pulled to the steelmaking for smelting.

[0029] Further, such as Figure 3 As shown, a first protective layer 8 is fixedly connected to the inner wall of the first flow nozzle 7, and a second protective layer 10 is fixedly connected to the inner wall of the second flow nozzle 9. The first protective layer 8 and the second protective layer 10 are both made of refractory clay coating, and the tops of the first protective layer 8 and the second protective layer 10 are both connected to the residual iron groove 12.

[0030] During operation, a protective layer of refractory clay is provided on the inner walls of the first nozzle 7 and the second nozzle 9 to prevent molten iron from corroding the first nozzle 7 and the second nozzle 9, thereby reducing the number of times the first nozzle 7 and the second nozzle 9 need to be replaced.

[0031] Further, such as Figure 3 and Figure 4 As shown, the first flow nozzle 7 and the second flow nozzle 9 are connected and fixedly connected on the side wall adjacent to the first flow nozzle 7, and the second flow nozzle 9 is connected and fixedly connected on the side wall adjacent to the first flow nozzle 7. The bottom of the frame main beam 6 is fixedly connected to an electric push rod 15, and the output end of the electric push rod 15 is fixedly connected to a connecting plate 14. The bottom of the connecting plate 14 is fixedly connected to a gate plate 11, and the two ends of the gate plate 11 are respectively slidably connected to the first sleeve 17 and the second sleeve 16, and the two ends of the gate plate 11 are respectively matched with the first sleeve 17 and the second sleeve 16; a water-free mud layer is provided in the gate plate 11.

[0032] During operation, in order to realize the alternate reception of molten iron, when the first first molten iron tank 22 on the first rail 21 receives it, the electric push rod 15 is turned on, and the output end of the electric push rod 15 drives the connecting plate 14 to move to the right, and the connecting plate 14 drives the gate 11 to move. The gate 11 slides away from the second flow nozzle 9 in the second sleeve 16, and the other end blocks the first flow nozzle 7. The molten iron flows from the second flow nozzle 9 to the first molten iron tank 22, and then when the first second molten iron tank 24 on the second rail 23 receives it, the electric push is driven to move in the opposite direction. The electric push rod 15 drives the gate 11 to move through the connecting plate 14, and the gate 11 moves toward the second flow nozzle 9 to block the second flow nozzle 9. The molten iron flows out of the first flow nozzle 7 to the second molten iron tank 24, and so on and so forth to realize the alternate reception of molten iron.

[0033] Further, such as Figure 3 As shown, a slow flow plate 13 is fixed to the top of the cover plate 4 , and the height of the slow flow plate 13 is greater than half the height of the residual iron groove 12 .

[0034] During operation, the rapid outflow of a large amount of molten iron will cause high-temperature slag and iron to pour out, seriously affecting the entire medium repair or overhaul process, and even causing serious safety accidents. By setting a slow-flow plate 13, the flow of molten iron is slowed down. The slow-flow plate 13 prevents the molten iron from splashing to the outside of the residual iron groove 12, thereby improving the situation of molten iron splashing during the residual iron discharge operation of the furnace body 1 overhaul.

[0035] Further, such as Figure 5 As shown, a refractory brick layer 19 is laid on the top inner wall of the frame main beam 6 , and a castable layer 18 is laid on the top of the refractory brick layer 19 .

[0036] During operation, the bottom and sides of the residual iron ditch 12 are evenly laid with a refractory brick layer 19, and then a layer of castable is laid; the thickness of the front castable layer 18 is 300mm, and the thickness of the end castable layer 18 is 200mm. After completion, they must be dried with gas fire; a layer of baking-free ramming material is laid on the upper surface of the castable layer 18, and the slope of the residual iron ditch 12 is based on the drop of the steel structure, and the thickness of the baking-free ramming material layer is connected to complete it.

[0037] Further, such as Figure 3 As shown, the casting material layer 18 is provided with reinforcing ribs 20 , and the reinforcing ribs 20 are connected to the top of the first bracket 2 and the second bracket 3 respectively.

[0038] During operation, the mechanical strength of the castable layer 18 and the frame main beam 6 is increased by providing the structure of the reinforcing ribs 20 , and deformation caused by the high temperature and pressure of the molten iron is reduced.

[0039] Further, such as Figure 2 As shown, a protective cover 5 is fixed to one side wall of the cover plate 4 , and the inner wall of the protective cover 5 is made of high-temperature resistant material.

[0040] During operation, the protective cover 5 can be made of welded metal plates, and the inner wall is coated with high-temperature resistant material to reduce erosion and corrosion by molten iron. The protective cover 5 also prevents molten iron from splashing to the outside of the residual iron groove 12.

[0041] Further, such as Figure 1 As shown, six first molten iron tanks 22 are slidably connected to the top of the first rail 21; six second molten iron tanks 24 are slidably connected to the top of the second rail 23, the first molten iron tanks 22 are respectively matched with the second spouts 9, and the second molten iron tanks 24 are respectively matched with the first spouts 7.

[0042] During operation, the first rail 21 and the second rail 23 are used, and six 180-ton molten iron tanks are prepared for each rail line. The two rail lines produce iron at the same time to speed up the efficiency of iron production. The ground is paved with thick yellow sand, and the ground water pipes and instrument boxes are protected by refractory bricks and spray paint to prevent molten iron from splashing and burning equipment and facilities.

[0043] Working Principle: Based on the analysis of the erosion situation based on the temperature of the hearth and bottom, the erosion location of the hearth is determined to be locally on the upper part of the fifth layer of carbon bricks. By setting the first bracket 2 and the second bracket 3, the slope of the frame main beam 6 is made 3.6°, and the residual iron groove 12 is extended to the position of the first rail 21 and the second rail 23. The molten iron tanks on the two rails receive molten iron at the same time and are replaced alternately to ensure that there is always a molten iron tank receiving iron. After all the residual iron is released, it is pulled to the steelmaking for smelting; the two rails are simultaneously tapping iron to speed up the tapping efficiency. The ground is paved with thick yellow sand, and the ground water pipes and instrument boxes are protected by refractory bricks and spray coating to prevent molten iron from splashing and burning equipment and facilities.

[0044] In order to realize the alternate reception of molten iron, when the first first molten iron tank 22 on the first rail 21 receives the molten iron, the electric push rod 15 is turned on, and the output end of the electric push rod 15 drives the connecting plate 14 to move to the right, and the connecting plate 14 drives the gate 11 to move. The gate 11 slides away from the second flow nozzle 9 in the second sleeve 16, and the other end blocks the first flow nozzle 7. The molten iron flows from the second flow nozzle 9 to the first molten iron tank 22. Then, when the first second molten iron tank 24 on the second rail 23 receives the molten iron, the electric push rod 15 is driven to move in the opposite direction. The electric push rod 15 drives the gate 11 to move through the connecting plate 14. The gate 11 moves toward the second flow nozzle 9, blocks the second flow nozzle 9, and the molten iron flows out of the first flow nozzle 7 into the second molten iron tank 24. This reciprocating motion is realized to realize the alternate reception of molten iron.

[0045] Since a large amount of molten iron flowing out rapidly will cause high-temperature slag and iron to pour out, seriously affecting the entire medium repair or overhaul process, and even causing serious safety accidents, the flow of molten iron is slowed down by setting a slow flow plate 13. The slow flow plate 13 prevents the molten iron from splashing to the outside of the residual iron groove 12, thereby improving the situation of molten iron splashing during the residual iron discharge operation of the furnace body 1 overhaul.

[0046] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A blast furnace anti-splashing residual iron discharge device, comprising a furnace body (1), characterized in that: One side of the furnace body (1) is connected and fixedly connected to a frame main beam (6); a cover plate (4) is fixedly connected to the top of the frame main beam (6); a residual iron groove (12) is formed between the cover plate (4) and the frame main beam (6); the residual iron groove (12) is trapezoidal in shape, with a larger upper portion and a smaller lower portion; a first bracket (2) and a second bracket (3) are fixedly connected to the bottom of the frame main beam (6) in sequence; the first bracket (2) is higher than the second bracket (3); the slope between the bottom surface of the frame main beam (6) and the ground is 3.6°; a first flow nozzle (7) and a second flow nozzle (9) are connected and fixedly connected to the bottom of the frame main beam (6); a second rail (23) is provided below the first flow nozzle (7); and a first rail (21) is provided below the second flow nozzle (9).

2. The blast furnace anti-splash residual iron discharge device according to claim 1, characterized in that: A first protective layer (8) is fixedly connected to the inner wall of the first flow nozzle (7), and a second protective layer (10) is fixedly connected to the inner wall of the second flow nozzle (9). The first protective layer (8) and the second protective layer (10) are both made of refractory clay coating, and the tops of the first protective layer (8) and the second protective layer (10) are both connected to the residual iron groove (12).

3. The device for discharging residual iron from a blast furnace to prevent splashing according to claim 2, characterized in that: The first flow nozzle (7) and the second flow nozzle (9) are connected and fixedly connected to the side wall adjacent to the first flow nozzle (7), and the second flow nozzle (9) is connected and fixedly connected to the side wall adjacent to the first flow nozzle (7). The bottom of the frame main beam (6) is fixedly connected to an electric push rod (15), the output end of the electric push rod (15) is fixedly connected to a connecting plate (14), and the bottom of the connecting plate (14) is fixedly connected to a gate plate (11). The two ends of the gate plate (11) are respectively slidably connected to the first sleeve (17) and the second sleeve (16), and the two ends of the gate plate (11) are respectively matched with the first sleeve (17) and the second sleeve (16); a water-free mud layer is provided in the gate plate (11).

4. The device for discharging residual iron from a blast furnace to prevent splashing according to claim 3, characterized in that: A slow flow plate (13) is fixedly connected to the top of the cover plate (4), and the height of the slow flow plate (13) is greater than half the height of the residual iron groove (12).

5. The device for discharging residual iron from a blast furnace to prevent splashing according to claim 4, characterized in that: A refractory brick layer (19) is laid on the top inner wall of the frame main beam (6), and a castable layer (18) is laid on the top of the refractory brick layer (19).

6. The device for discharging residual iron from a blast furnace to prevent splashing according to claim 5, characterized in that: The casting material layer (18) is provided with reinforcing ribs (20), and the reinforcing ribs (20) are respectively connected to the tops of the first bracket (2) and the second bracket (3).

7. The device for discharging residual iron from a blast furnace to prevent splashing according to claim 6, characterized in that: A protective cover (5) is fixedly connected to one side wall of the cover plate (4), and the inner wall of the protective cover (5) is made of high-temperature resistant material.

8. The device for discharging residual iron from a blast furnace to prevent splashing according to claim 7, characterized in that: The top of the first rail (21) is slidably connected to six first molten iron tanks (22); the top of the second rail (23) is slidably connected to six second molten iron tanks (24), the first molten iron tanks (22) are respectively matched with the second spouts (9), and the second molten iron tanks (24) are respectively matched with the first spouts (7).

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