Scrap steel preheating and adding device based on spiral blanking and flue gas waste heat coupling

Abstract

The utility model provides a scrap steel preheating and adding device based on spiral blanking and flue gas waste heat coupling, and relates to the technical field of scrap steel smelting. The scrap steel preheating and adding device based on spiral discharging and flue gas waste heat coupling comprises a cover plate, a feeding device and a discharging device, wherein the cover plate is used for covering a top opening of a hot-metal bottle; the spiral discharging pipe is connected to the cover plate, and the bottom end of the spiral discharging pipe extends to the position below the cover plate; and the smoke suction mechanism is connected to the cover plate, and the smoke suction mechanism is used for heating the spiral discharging pipe by utilizing heat in smoke released from the molten iron tank. According to the utility model, scrap steel materials are discharged in the spiral discharging pipe along a spiral path by virtue of the gravity of the scrap steel materials, so that the time that the scrap steel materials enter a hot-metal bottle is prolonged, the scrap steel materials are fully preheated, the temperature of the preheated scrap steel materials is increased, the steelmaking efficiency can be obviously improved, and the energy consumption is reduced; and a certain energy-saving effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of scrap steel smelting technology, and more specifically, to a scrap steel preheating and adding device based on the coupling of spiral feeding and flue gas waste heat. Background Technology

[0002] In the steel smelting industry, preheating scrap steel is one of the core processes for achieving green and low-carbon smelting. In traditional steelmaking, the high-temperature molten metal (1300-1500℃) in the ladle generates a large amount of medium-high temperature flue gas (600-800℃). This flue gas is usually directly discharged after dust removal and purification, resulting in significant waste of thermal energy. Meanwhile, adding cold scrap steel (room temperature to 200℃) directly to the ladle causes a sharp drop in the molten pool temperature. To maintain the smelting temperature, additional coke or electricity is required, directly increasing production costs and carbon emission intensity. Industry statistics show that for every 100℃ increase in scrap steel preheating temperature, energy consumption in the steelmaking process can be reduced by 8% to 12%. Therefore, efficiently utilizing waste heat from flue gas to preheat scrap steel has become a key path for steel companies to save energy and reduce consumption.

[0003] Although existing technologies have attempted to preheat scrap steel by combining vertical feeding devices with independent waste heat boilers, there are still systemic defects: the vertical feeding method results in a short residence time of scrap steel in the preheating zone, leading to generally low preheating temperatures. Utility Model Content

[0004] To at least partially solve the above problems, this utility model provides a scrap steel preheating and adding device based on the coupling of spiral feeding and flue gas waste heat, comprising: a cover plate for covering the top opening of the molten iron ladle; a spiral feeding pipe connected to the cover plate, with the bottom end of the spiral feeding pipe extending below the cover plate; and a smoke extraction mechanism connected to the cover plate, the smoke extraction mechanism being used to heat the spiral feeding pipe by utilizing the heat released from the flue gas in the molten iron ladle.

[0005] Optionally, the spiral feeding tube includes a tube body and a spiral shaft. The two ends of the tube body are open structures. The bottom end of the tube body is connected to the cover plate and passes through the cover plate. The spiral shaft is located inside the tube body.

[0006] Optionally, the upper opening of the tube is further connected to a support, the top end of the spiral shaft is connected to the support, and the outer periphery of the spiral blades of the spiral shaft abuts against the inner circumferential surface of the tube.

[0007] Optionally, the scrap steel preheating and adding device based on spiral feeding and flue gas waste heat coupling further includes a preheating pipe, with multiple preheating pipes arranged in a ring on the inner wall of the pipe body, and the smoke extraction mechanism is used to send the flue gas released from the molten iron ladle into the preheating pipe.

[0008] Optionally, the smoke extraction mechanism includes a fan and a smoke delivery pipe. The fan is connected to the cover plate, one end of the smoke delivery pipe is connected to the air outlet of the fan, and the other end of the smoke delivery pipe is connected to a plurality of the preheating pipes.

[0009] Optionally, the scrap steel preheating and adding device based on the coupling of spiral feeding and flue gas waste heat further includes a lifting mechanism and a moving mechanism. The moving mechanism includes a moving trolley, an X-axis moving track beam, and a Y-axis track beam. The X-axis moving track beam is mounted on the Y-axis track beam, the moving trolley is mounted on the X-axis moving track beam, and the lifting mechanism is connected to the moving trolley. The lifting mechanism is used to drive the spiral feeding pipe to rise or fall.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] By covering the top of the molten iron ladle with a cover plate, scrap steel is fed into the ladle from the top in a spiral feeding pipe. At the same time, the fume extraction mechanism can use the heat from the flue gas released from the molten iron ladle to heat the spiral feeding pipe. Since the scrap steel is fed into the spiral feeding pipe by its own gravity along a spiral path, the time it takes for the scrap steel to enter the molten iron ladle is extended, thus allowing the scrap steel to be fully preheated and increasing its temperature after preheating. This significantly improves steelmaking efficiency, reduces energy consumption, and achieves a certain energy-saving effect. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0013] Figure 2 This is a front view of an embodiment of the present utility model;

[0014] Figure 3 This is a schematic diagram of the spiral feed tube in an embodiment of the present invention.

[0015] Explanation of reference numerals in the attached drawings: 1. Cover plate; 2. Spiral feed pipe; 21. Pipe body; 22. Spiral shaft; 3. Smoke extraction mechanism; 4. Lifting mechanism; 5. Moving mechanism; 51. Moving trolley; 52. X-axis moving track beam; 53. Y-axis track beam; 6. Preheating pipe; 100. Molten iron ladle. Detailed Implementation

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] In the attached diagram, the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis indicating up and the negative direction indicating down. The X-axis represents the horizontal direction, designated as left and right, with the positive direction of the X-axis indicating the left and the negative direction indicating the right. The Y-axis represents the front and back direction, with the positive direction of the Y-axis indicating the front and the negative direction indicating the back. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] This utility model embodiment provides a scrap steel preheating and adding device based on the coupling of spiral feeding and flue gas waste heat, including: a cover plate 1 for covering the top opening of a molten iron ladle 100; a spiral feeding pipe 2 connected to the cover plate 1, with the bottom end of the spiral feeding pipe 2 extending below the cover plate 1; and a smoke extraction mechanism 3 connected to the cover plate 1, the smoke extraction mechanism 3 being used to heat the spiral feeding pipe 2 by releasing heat from the flue gas released from the molten iron ladle 100.

[0019] It should be noted that the scrap steel material can be small scrap steel materials such as scrap steel granules and scrap steel pieces. When feeding, a material hoist can be used to transport the scrap steel material into the upper opening of the pipe body 21. The material hoist can be a chute hoist, belt hoist, or other equipment.

[0020] In this optional embodiment, combined with Figure 1 and Figure 2 By covering the top opening of the molten iron ladle 100 with the cover plate 1, scrap steel is fed into the molten iron ladle 100 from the top opening in a spiral manner through the spiral feeding pipe 2. At the same time, the fume extraction mechanism 3 can utilize the heat from the flue gas released from the molten iron ladle 100 to heat the spiral feeding pipe 2. Since the scrap steel is fed into the spiral feeding pipe 2 in a spiral path by its own gravity, the time for the scrap steel to enter the molten iron ladle 100 is extended, thereby allowing the scrap steel to be fully preheated and increasing the temperature of the preheated scrap steel. This can significantly improve steelmaking efficiency, reduce energy consumption, and achieve a certain energy-saving effect.

[0021] Combination Figure 1 and Figure 2 Optionally, the spiral feeding tube 2 includes a tube body 21 and a spiral shaft 22. The two ends of the tube body 21 are open structures. The bottom end of the tube body 21 is connected to the cover plate 1 and passes through the cover plate 1. The spiral shaft 22 is located inside the tube body 21.

[0022] Combination Figure 2Optionally, the upper opening of the tube body 21 is also connected to a bracket, the top end of the spiral shaft 22 is connected to the bracket, and the outer periphery of the spiral blades of the spiral shaft 22 abuts against the inner periphery of the tube body 21.

[0023] In this optional embodiment, the support can be welded to the inner circumferential surface of the upper opening of the tube 21, and the top end of the spiral shaft 22 can also be connected to the support by welding, so that the spiral shaft 22 and the tube 21 are coaxially arranged, and the outer circumferential edge of the spiral blade of the spiral shaft 22 abuts against the inner circumferential surface of the tube 21, so that the scrap steel material can spiral down on the spiral shaft 22.

[0024] Combination Figure 2 and Figure 3 Optionally, the scrap steel preheating and adding device based on spiral feeding and flue gas waste heat coupling also includes a preheating pipe 6, with multiple preheating pipes 6 arranged around the inner wall of the pipe body 21, and the smoke extraction mechanism 3 is used to send the flue gas released from the molten iron ladle 100 into the preheating pipe 6.

[0025] In this optional embodiment, multiple grooves can be formed on the inner wall of the tube body 21. The preheating tube 6 is installed in the grooves. The flue gas released from the molten iron ladle 100 is sent into the preheating tube 6 through the smoke extraction mechanism 3 to preheat the preheating tube 6, thereby heating the spiral feeding tube 2 to a certain extent. In conjunction with the scrap steel material being fed in a spiral downward manner, the preheating effect of the scrap steel material is achieved.

[0026] Combination Figure 1 and Figure 2 The smoke extraction mechanism 3 includes a fan and a smoke delivery pipe. The fan is connected to the cover plate 1. One end of the smoke delivery pipe is connected to the air outlet of the fan, and the other end of the smoke delivery pipe is connected to multiple preheating pipes 6.

[0027] In this optional embodiment, through openings can be made on both sides of the cover plate 1, and the fan can be installed in the through openings. The air inlet of the fan faces downward and the air outlet of the fan faces upward and is connected to the flue pipe. The other end of the flue pipe can be connected to one end of the corresponding preheating pipe 6 through multiple branch pipes. The other end of the preheating pipe 6 can be connected to one end of a flue pipe through a pipeline. The other end of the flue pipe can be connected to external flue gas waste heat utilization equipment, flue gas treatment equipment, etc.

[0028] Combination Figure 1 and Figure 2Optionally, the scrap steel preheating and adding device based on the coupling of spiral feeding and flue gas waste heat further includes a lifting mechanism 4 and a moving mechanism 5. The moving mechanism 5 includes a moving trolley 51, an X-axis moving track beam 52 and a Y-axis track beam 53. The X-axis moving track beam 52 is mounted on the Y-axis track beam 53, and the moving trolley 51 is mounted on the X-axis moving track beam 52. The lifting mechanism 4 is connected to the moving trolley 51 and is used to drive the spiral feeding pipe 2 to rise or fall.

[0029] In this embodiment, electric trolleys can be installed at both ends of the X-axis moving track beam 52. The electric trolleys are movably mounted on the Y-axis track beam 53, so that the X-axis moving track beam 52 can move along the Y-axis track beam 53, that is, move along the Y-axis direction in the figure. The moving trolley 51 can be an electric trolley and is installed on the X-axis moving track beam 52, so that the moving trolley 51 can move along the X-axis moving track beam 52, that is, move along the X-axis direction in the figure. The lifting mechanism 4 can be an electric hoist, crane or other equipment, and hooks can be installed on the cover plate 1 or the pipe body 21. In this way, the hooks of the electric hoist, crane or other equipment are hooked on the hooks, thereby realizing the lifting and moving of the spiral feeding pipe 2, that is, moving along the Z-axis direction in the figure, and thus realizing the movement of the scrap steel adding device on the X-axis, Y-axis and Z-axis, so that the cover plate 1 closes to the top opening of the molten iron ladle 100 or leaves the top opening of the molten iron ladle 100.

[0030] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A scrap steel preheating and adding device based on spiral feeding and flue gas waste heat coupling, characterized in that, include: A cover plate (1) is used to cover the top opening of the molten iron ladle (100); A spiral feed pipe (2) is connected to the cover plate (1), and the bottom end of the spiral feed pipe (2) extends to the bottom of the cover plate (1); a smoke extraction mechanism (3) is connected to the cover plate (1), and the smoke extraction mechanism (3) is used to heat the spiral feed pipe (2) by using the heat in the flue gas released from the molten iron ladle (100).

2. The scrap preheating and adding device based on spiral down feed coupled with flue gas waste heat according to claim 1, characterized in that, The spiral feeding tube (2) includes a tube body (21) and a spiral shaft (22). The two ends of the tube body (21) are open structures. The bottom end of the tube body (21) is connected to the cover plate (1) and the bottom end of the tube body (21) passes through the cover plate (1). The spiral shaft (22) is located inside the tube body (21).

3. The scrap preheating and adding device based on spiral feeding coupled with flue gas waste heat according to claim 2, characterized in that, The upper opening of the tube (21) is also connected to a bracket, the top end of the spiral shaft (22) is connected to the bracket, and the outer periphery of the spiral blade of the spiral shaft (22) abuts against the inner periphery of the tube (21).

4. The scrap preheating and adding device based on spiral feeding and coupled with flue gas waste heat according to claim 2, characterized in that, It also includes a preheating tube (6), a plurality of the preheating tubes (6) being arranged around the inner wall of the tube body (21), and the smoke extraction mechanism (3) being used to send the flue gas released from the molten iron ladle (100) into the preheating tube (6).

5. The scrap preheating and adding device based on spiral down feed coupled with flue gas waste heat according to claim 4, characterized in that, The smoke extraction mechanism (3) includes a fan and a smoke delivery pipe. The fan is connected to the cover plate (1). One end of the smoke delivery pipe is connected to the air outlet of the fan, and the other end of the smoke delivery pipe is connected to multiple preheating pipes (6).

6. The scrap preheating and adding device based on spiral down feed coupled with flue gas waste heat according to claim 1, characterized in that, It also includes a lifting mechanism (4) and a moving mechanism (5). The moving mechanism (5) includes a moving trolley (51), an X-axis moving track beam (52), and a Y-axis track beam (53). The X-axis moving track beam (52) is mounted on the Y-axis track beam (53). The moving trolley (51) is mounted on the X-axis moving track beam (52). The lifting mechanism (4) is connected to the moving trolley (51). The lifting mechanism (4) is used to drive the spiral feed pipe (2) to rise or fall.

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