Blast furnace burden proportioning equipment with optimized air supply convolution structure

Abstract

The utility model discloses blast furnace burden proportioning equipment with an optimized air supply convolution structure, which comprises a blast furnace body, the top of the blast furnace body is provided with a charging port, the inner bottom of the blast furnace body is provided with a hearth bottom, one side of the hearth bottom is provided with a blast nozzle, an air inlet pipe is fixedly mounted in the blast nozzle, and the blast nozzle is provided with a blast hole. An air supply pipe is installed in the air inlet pipe, a butt flange sealing gasket is installed at the right end of the air supply pipe, a right side flange of the butt flange sealing gasket is connected with a conical pipe, the right end of the conical pipe is connected with a necking pipe, and the right end of the necking pipe is connected with an air outlet. The diameter of the air supply pipe is smaller than that of the air inlet pipe, the diameter of the air inlet pipe is smaller than that of the blower nozzle, and the closer to the blower nozzle, the larger the diameter is, so that the air inlet area is increased accordingly, and the range and the length of the air port rotation area are enlarged by increasing the air inlet area. And the range of the rotary motion formed in the tuyere rotary area is larger.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnaces, in particular to blast furnace charge proportioning equipment with an optimized air supply swirling structure. Background Art

[0002] With the sharp rise in ore prices in recent years, all steel companies are striving to find effective ways to reduce costs and increase efficiency. Sintered ore, pelletized ore and natural rich ore are the basic charges of blast furnaces. Reasonable charge matching optimizes the smelting technology of blast furnaces, thereby reducing production costs. Optimizing charge structure is the fundamental guarantee for strengthening smelting. Reasonable charge structure can improve the reducibility of charge, so that various indicators of metallurgical performance of blast furnaces such as soft melting dripping, pulverization and expansion after reduction can be improved. Reasonable charging system determines the initial distribution of charge in the throat section. The charging system and air supply system are the final distribution of coal gas flow in the furnace. Therefore, the charging system and air supply system cooperate with each other to obtain a reasonable distribution of two coal gas flows. A good charging system corresponds to a good operating furnace type. And the formation of a good operating furnace type is the result of long-term stability.

[0003] During the combustion process after the existing blast furnace charge is proportioned, in the tuyere combustion zone, the coke descending from the dripping zone burns in front of the tuyere, and under the action of the kinetic energy of the blast, the coke burns in a violent swirling motion, forming a "bird's nest" shaped swirling zone. The coke in the swirling zone swirls and burns under the action of high-speed blast. This area is the only oxidizing area in the blast furnace, and since the wind zone range of the swirling zone is small, the length of the tuyere swirling zone is insufficient, resulting in poor initial gas flow distribution, which is not conducive to the stable operation of the blast furnace, the combustion ratio of the fuel increases, and the rationality of the charge proportioning is reduced.

[0004] Therefore, those skilled in the art provide a blast furnace charge proportioning device with an optimized air supply swirl structure to solve the problems raised in the above-mentioned background technology. Utility Model Content

[0005] The purpose of the utility model is to provide a blast furnace charge proportioning device with an optimized air supply vortex structure to solve the problem of insufficient length of the existing tuyere vortex zone proposed in the above background technology, resulting in poor initial gas flow distribution and increased fuel combustion ratio.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A blast furnace charge proportioning device with an optimized air supply swirl structure comprises: a blast furnace body, a charging port is arranged on the top of the blast furnace body, a furnace bottom is arranged on the inner bottom of the blast furnace body, a blast port is arranged on one side of the furnace bottom, an air inlet pipe is fixedly installed inside the blast port, an air supply pipe is installed inside the air inlet pipe, a butt flange sealing gasket is installed on the right end of the air supply pipe, and a tapered pipe is connected to the right flange of the butt flange sealing gasket, the right end of the tapered pipe is connected to a necked pipe, the right end of the necked pipe is connected to an air outlet, and a wind zone inlet is installed on the right end of the air outlet;

[0008] A small-diameter inner tube is arranged inside the air supply tube, an expansion area is installed on the right side of the small-diameter inner tube, and a large rotary vane is fixedly arranged inside the expansion area.

[0009] As a further solution of the utility model, a small rotating vane is installed inside the conical tube, the conical tube and the necked tube are fixedly connected, and the conical tube is connected to the air outlet through the necked tube.

[0010] As a further solution of the utility model, a clamp frame is installed on the outer wall of the air supply duct through a bolt-fastening sleeve, a mounting frame is installed on one side of the clamp frame, and a support frame is connected to the bottom of the mounting frame.

[0011] As a further solution of the utility model, a telescopic cylinder is installed above the clamp frame and the mounting frame, and the front and rear ends of the telescopic cylinder are movably connected with movable seats.

[0012] As a further solution of the utility model, both ends of the telescopic cylinder are movably connected to the clamp frame and the mounting frame through a movable seat, and the mounting frame and the supporting frame are fixed to each other.

[0013] As a further solution in the utility model, an air ring is arranged inside the wind zone inlet, and a rotary cut is arranged in the middle of the wind ring, an air outlet is arranged between the rotary cut and the inner wall of the wind zone inlet, and a streamlined streamlined sheet is arranged inside the air outlet.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The diameter of the air supply pipe is smaller than that of the air inlet pipe, and the diameter of the air inlet pipe is smaller than that of the blast port. The closer to the blast port, the larger the diameter is, so the air inlet area also increases accordingly. The range and length of the tuyere vortex zone are expanded by increasing the air inlet area. When the air inlet area of ​​the tuyere vortex zone increases, the range of the vortex motion formed in the tuyere vortex zone also becomes larger. In the formed vortex zone, the coke vortexes and burns under the action of high-speed blast. In this way, by optimizing the length range of the tuyere vortex zone and improving the distribution of coal gas flow, the combustion ratio is reduced, the rationality of the charge ratio is improved, and the stable and smooth operation of the blast furnace is facilitated.

[0016] 2. A small-diameter inner tube is installed inside the air supply pipe. The diameter of the small-diameter inner tube is smaller than the diameter of the middle section of the air supply pipe. The small-diameter inner tube is used to reduce the diameter of the air volume passing through, thereby accelerating the air supply speed. When entering the expansion area, it can cooperate with the large rotary vane arranged in the expansion area to make the air supply wind direction spirally twisted. When entering the tapered tube and the necked tube, the wind speed is accelerated and enters the bottom of the furnace through the air zone inlet. The diameter of the air zone inlet is larger than the diameter of the air supply pipe. After increasing the wind flow rate, the air inlet area is expanded, which is beneficial to expanding the range of the vortex zone of the air outlet. At the same time, the cooperation of the large rotary vane and the small rotary vane, as well as the rotary cut provided on the surface of the air zone inlet can make the wind enter in a spiral shape, cooperate with the vortex zone, which is beneficial to the formation of vortex wind in the vortex zone, optimize the formation structure of the vortex zone of the air outlet, increase the vortex motion of coke in the vortex zone, and help improve the distribution of coal gas flow and reduce the combustion ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the structure of a blast furnace charge proportioning equipment with an optimized air supply swirl structure.

[0018] Figure 2 The present invention is a schematic diagram of the installation structure between the air supply pipe and the conical pipe of a blast furnace charge proportioning equipment with an optimized air supply swirl structure.

[0019] Figure 3 This is a schematic diagram of the split structure of the air supply pipe and the tapered pipe in a blast furnace charge proportioning equipment with an optimized air supply swirl structure.

[0020] Figure 4 The present invention is a schematic diagram of the cross-sectional structure of an air supply pipe in a blast furnace charge proportioning equipment with an optimized air supply swirl structure.

[0021] Figure 5 The present invention is a schematic diagram of the structure of the inlet of the middle wind zone of a blast furnace charge proportioning equipment with an optimized air supply swirl structure.

[0022] Figure 6 A blast furnace charge proportioning device with optimized air supply swirl structure Figure 5 Schematic diagram of the structure enlarged at point A in the middle.

[0023] Figure 7 The present invention is a schematic diagram of the cross-sectional structure of the air inlet pipe and the air supply pipe in a blast furnace charge proportioning equipment with an optimized air supply swirl structure.

[0024] In the figure: 1. blast furnace body; 2. charging port; 3. furnace bottom; 4. tuyere; 5. air inlet pipe; 6. air supply pipe; 601. small diameter inner pipe; 602. expansion area; 603. large rotary vane; 7. clamp frame; 8. mounting frame; 9. support frame; 10. telescopic cylinder; 11. movable seat; 12. docking flange gasket; 13. tapered pipe; 14. necked pipe; 15. air outlet; 16. air zone inlet; 1601. air ring; 1602. air outlet; 1603. rotary cut; 1604. streamlined sheet; 17. small rotary vane. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1 to Figure 7 The utility model embodiment provides a blast furnace charge proportioning device with optimized air supply swirl structure, comprising: a blast furnace body 1, a charging port 2 is arranged on the top of the blast furnace body 1, and a furnace bottom 3 is arranged on the inner bottom of the blast furnace body 1, a blast port 4 is arranged on one side of the furnace bottom 3, an air inlet pipe 5 is fixedly installed inside the blast port 4, an air supply pipe 6 is installed inside the air inlet pipe 5, a clamp frame 7 is installed on the outer wall of the air supply pipe 6 by bolt fastening sleeve, a mounting frame 8 is installed on one side of the clamp frame 7, a support frame 9 is connected to the bottom of the mounting frame 8, a telescopic cylinder 10 is installed above the clamp frame 7 and the mounting frame 8, and a movable seat 11 is movably connected to the front and rear ends of the telescopic cylinder 10, and the two ends of the telescopic cylinder 10 are respectively movably connected with the clamp frame 7 and the mounting frame 8 through the movable seat 11, and the mounting frame 8 and the support frame 9 are fixed to each other;

[0027] Specifically, the air blast port 4 is connected with the air inlet pipe 5 and the air supply pipe 6. The air supply pipe 6 is installed inside the air inlet pipe 5 and matches the internal size of the air inlet pipe 5. The diameters of the air supply pipe 6, the air inlet pipe 5 and the air blast port 4 gradually increase from the outside to the inside. The closer to the air blast port 4, the larger the diameter. In this way, the air inlet area also increases accordingly. The range of the air outlet swirl zone is expanded by increasing the air inlet area. A clamp frame 7 and a mounting frame 8 are simultaneously installed on the air supply pipe 6. The mounting frame 8 is fixedly connected to the support frame 9. The clamp frame 7 is mounted on the air supply pipe 6. The air supply pipe 6 is withdrawn from the inside of the air inlet pipe 5 by the extension and retraction of the telescopic cylinder 10, so as to facilitate the inspection and maintenance of the parts of the air supply pipe 6 and avoid blockage of the air supply pipe 6.

[0028] A butt flange gasket 12 is installed at the right end of the air supply pipe 6, and a tapered pipe 13 is connected to the right flange of the butt flange gasket 12, the right end of the tapered pipe 13 is connected to a necked pipe 14, the right end of the necked pipe 14 is connected to an air outlet 15, a small rotary vane 17 is installed inside the tapered pipe 13, the tapered pipe 13 and the necked pipe 14 are fixedly connected, the tapered pipe 13 is connected to the air outlet 15 through the necked pipe 14, a small diameter inner pipe 601 is arranged inside the air supply pipe 6, an expansion area 602 is installed on the right side of the small diameter inner pipe 601, and a large rotary vane 603 is fixedly arranged inside the expansion area 602;

[0029] Specifically, the air supply pipe 6 is connected to the tapered pipe 13, and the tapered pipe 13 is connected to the necked pipe 14. The necked pipe 14 cooperates with the tapered pipe 13 to reduce the diameter of the wind, thereby accelerating the flow rate of the wind. By increasing the speed of the blast, the diameter of the small-diameter inner pipe 601 is smaller than the diameter of the middle section of the air supply pipe 6. The small-diameter inner pipe 601 is used to reduce the diameter of the air volume passing through, and cooperates with the tapered pipe 13 and the necked pipe 14 to accelerate the air supply speed. After entering the expansion area 602, By utilizing the large swirl vane 603 provided in the expansion zone 602, the air supply direction is spirally twisted. Meanwhile, the interior of the conical tube 13 is provided with a small swirl vane 17. The cooperation between the large swirl vane 603 and the small swirl vane 17 allows the wind to enter in a spiral shape, which, in conjunction with the whirlpool zone, is beneficial to the formation of whirlwind in the whirlpool zone. This can be coordinated with the charge ratio, improve the charge ratio, and reduce the combustion ratio. By optimizing the whirlpool zone to coordinate with the charge ratio, the stable and smooth operation of the blast furnace and the rationality of the charge ratio can be improved.

[0030] The right end of the air outlet 15 is provided with an air zone inlet 16, an air ring 1601 is provided inside the air zone inlet 16, and a rotary cut 1603 is provided in the middle of the air ring 1601, an air outlet 1602 is provided between the rotary cut 1603 and the inner wall of the air zone inlet 16, and a streamlined streamlined sheet 1604 is provided inside the air outlet 1602;

[0031] Specifically, the air outlet 15 adopts a conical structure, which is consistent with the structure of the conical tube 13. When the wind enters the conical tube 13 and the necked tube 14, the wind speed is accelerated, and the wind enters the furnace bottom 3 through the air outlet 15. The diameter of the air outlet 15 is larger than the diameter of the necked tube 14. After the wind flow rate is increased, the air inlet area is expanded, and then the wind enters through the wind zone inlet 16, which is beneficial to expand the range of the vortex zone of the air outlet. A rotary cut 1603 is set on the surface of the wind zone inlet 16, which, together with the large rotary blade 603 and the small rotary blade 17, can make the wind enter in a spiral shape, cooperate with the vortex zone, facilitate the formation of vortex wind in the vortex zone, optimize the formation structure of the vortex zone of the air outlet, and improve the vortex motion of coke in the vortex zone.

[0032] The working principle of the utility model is:

[0033] When using the utility model, first, the wind is sent into the air inlet pipe 5 through the air supply pipe 6, and then sent into the blast port 4 through the air inlet pipe 5. After the wind enters the air supply pipe 6, it will enter the small-diameter inner pipe 601. Since the diameter of the small-diameter inner pipe 601 is smaller than the diameter of the air supply pipe 6, after the wind enters the air supply pipe 6, it will then enter the small-diameter inner pipe 601, and the small-diameter inner pipe 601 is used to reduce the diameter of the air volume passing through. After passing through the small-diameter inner pipe 601, the wind will enter the expanded area 602, and the large rotating vane 603 provided in the expanded area 602 is used to make the air supply wind direction spirally twisted, and then enter the tapered tube 13 and the necked tube 14. The necked tube 14 will cooperate with the tapered tube 13 to reduce the passing diameter of the wind, thereby accelerating the flow rate of the wind, and utilizing the increased blast speed to accelerate the air supply speed. Secondly, the tapered tube 13 Small swirl blades 17, large swirl blades 603 and small swirl blades 17 are arranged inside, so that wind can enter the air outlet 15 in a spiral shape, and then enter the furnace bottom 3 through the wind zone inlet 16, and a spiral cut 1603 is arranged on the surface of the wind zone inlet 16, which, together with the large swirl blades 603 and the small swirl blades 17, can make wind enter the tuyere vortex zone inside the blast furnace in a spiral shape, and cooperate with the tuyere vortex zone, which is conducive to the formation of vortex wind in the tuyere vortex zone, and the diameter of the wind zone inlet 16 is larger than the diameter of the air supply pipe 6, so that the air inlet area is expanded after the wind flow rate is increased, which is conducive to expanding the range of the tuyere vortex zone, and when the air inlet area of ​​the tuyere vortex zone is increased, the range of the vortex motion formed in the tuyere vortex zone is also larger, so that by optimizing the length range of the tuyere vortex zone and improving the distribution of the coal gas flow, the combustion ratio is reduced and the rationality of the charge ratio is improved.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A blast furnace charge proportioning device with an optimized air supply swirl structure, characterized in that: include: A blast furnace body (1), wherein a charging port (2) is arranged at the top of the blast furnace body (1), and a furnace bottom (3) is arranged at the inner bottom of the blast furnace body (1), a blast port (4) is arranged on one side of the furnace bottom (3), an air inlet pipe (5) is fixedly installed inside the blast port (4), an air supply pipe (6) is installed inside the air inlet pipe (5), a butt flange sealing gasket (12) is installed at the right end of the air supply pipe (6), and a right flange of the butt flange sealing gasket (12) is connected to a conical tube (13), the right end of the conical tube (13) is connected to a necking tube (14), the right end of the necking tube (14) is connected to an air outlet (15), and the right end of the air outlet (15) is installed with a wind zone inlet (16); A small-diameter inner tube (601) is arranged inside the air supply tube (6), an expansion area (602) is installed on the right side of the small-diameter inner tube (601), and a large rotor (603) is fixedly arranged inside the expansion area (602).

2. The blast furnace charge proportioning equipment with optimized air supply swirl structure according to claim 1 is characterized in that: A small rotating blade (17) is installed inside the conical tube (13); the conical tube (13) and the necked tube (14) are fixedly connected; and the conical tube (13) and the air outlet (15) are connected to each other via the necked tube (14).

3. The blast furnace charge proportioning equipment with optimized air supply swirl structure according to claim 1 is characterized in that: A clamp frame (7) is installed on the outer wall of the air supply pipe (6) by means of a bolt-fastening sleeve, a mounting frame (8) is installed on one side of the clamp frame (7), and a support frame (9) is connected to the bottom of the mounting frame (8).

4. The blast furnace charge proportioning equipment with optimized air supply swirl structure according to claim 3 is characterized in that: A telescopic cylinder (10) is installed above the clamp frame (7) and the mounting frame (8), and a movable seat (11) is movably connected to both the front and rear ends of the telescopic cylinder (10).

5. The blast furnace charge proportioning equipment with optimized air supply swirl structure according to claim 4 is characterized in that: The two ends of the telescopic cylinder (10) are movably connected to the clamp frame (7) and the mounting frame (8) through a movable seat (11), and the mounting frame (8) and the supporting frame (9) are fixed to each other.

6. The blast furnace charge proportioning equipment with optimized air supply swirl structure according to claim 1, characterized in that: An air ring (1601) is arranged inside the air zone inlet (16), and a rotary cut (1603) is arranged in the middle of the air ring (1601), an air outlet (1602) is arranged between the rotary cut (1603) and the inner wall of the air zone inlet (16), and a streamlined streamlined sheet (1604) is arranged inside the air outlet (1602).

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