Electric furnace scrap supply system

Abstract

This invention belongs to the field of metallurgical technology and discloses an electric arc furnace scrap steel supply system that can improve the efficiency of scrap steel handling and transportation within a workshop. It includes a first electric arc furnace scrap steel supply system and a second electric arc furnace scrap steel supply system. The former includes a first scrap steel pool located outside the first charging section of the first electric arc furnace and a first conveyor belt assembly located inside the first charging section, perpendicularly connected to it. The first conveyor belt assembly is connected to an underground silo in the scrap steel handling workshop. The latter includes a second scrap steel pool located outside the second charging section of the second electric arc furnace and a second conveyor belt assembly located inside the second charging section, perpendicularly connected to it, as well as a scrap steel basket conveying assembly. The first and second charging sections are arranged at intervals along the same straight line and their material conveying directions are opposite. Scrap steel in the underground silo enters the first charging section via the first conveyor belt assembly or is transported by truck to the first scrap steel pool, the second scrap steel pool, and the scrap steel basket conveying assembly. The scrap steel basket conveying assembly then transports the scrap steel to the second charging section via the second conveyor belt.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, specifically to an electric arc furnace scrap steel supply system. Background Technology

[0002] The short-process steelmaking technology, with electric arc furnace (EAF) steelmaking at its core, significantly reduces engineering investment, steel consumption per ton, energy consumption, land area, and emissions of pollutants such as carbon dioxide compared to the long-process steelmaking technology. The main raw material for EAF short-process steelmaking is scrap steel, an excellent renewable resource that can theoretically be recycled indefinitely, making it more environmentally friendly than iron ore.

[0003] One of the major technological challenges currently facing the steel industry is transforming aging converter steelmaking workshops into modern, green, environmentally friendly, and low-carbon electric arc furnace (EAF) steelmaking workshops. Regarding the scrap steel supply system in the first domestic project to convert a long-process converter to a short-process EAF, the horizontal continuous charging EAF required a large plant area. This necessitated utilizing the existing converter workshop while simultaneously ensuring the rapid addition of large quantities of scrap steel to the EAF, making the handling and transportation of scrap steel within the workshop a significant challenge. Summary of the Invention

[0004] To make the handling and transportation of scrap steel in the workshop more efficient, this invention proposes an electric furnace scrap steel supply system.

[0005] The electric arc furnace scrap steel supply system according to the present invention includes: a first electric arc furnace scrap steel supply system and a second electric arc furnace scrap steel supply system arranged in parallel. The first electric arc furnace scrap steel supply system includes a first scrap steel pool arranged outside the first charging section of the first electric arc furnace, a first conveyor belt assembly arranged inside the first charging section and perpendicularly connected to the first charging section, and the first conveyor belt assembly is connected to an underground silo in a scrap steel transfer workshop. The second electric arc furnace scrap steel supply system includes a second scrap steel pool arranged outside the second charging section of the second electric arc furnace, a second conveyor belt arranged inside the second charging section and perpendicularly connected to the second charging section, and a scrap steel basket conveying assembly connected to the second conveyor belt assembly. The first charging section and the second charging section are arranged at intervals in the same straight direction, and the material conveying directions of the first charging section and the second charging section are opposite. Scrap steel in the underground silo enters the first charging section via the first conveyor belt assembly, or is transported by truck to the first scrap steel pool, the second scrap steel pool and the scrap steel basket conveying assembly. The scrap steel basket conveying assembly transports the scrap steel to the second charging section via the second conveyor belt assembly.

[0006] Furthermore, the first electric furnace scrap steel supply system also includes a chain conveyor vertically connected to the inner side of the first feeding section and at least one steel grabber located near the chain conveyor. The chain conveyor is arranged parallel to the first conveyor belt assembly. A third scrap steel pool is also arranged near the chain conveyor. The steel grabber is used to grab scrap steel from the third scrap steel pool and send it to the chain conveyor.

[0007] Furthermore, the chain conveyor is located on the side of the first conveyor belt assembly away from the second conveyor belt, and the steel grabber is located on the side away from the first conveyor belt assembly.

[0008] Furthermore, the chain conveyor is located between the first conveyor belt assembly and the second conveyor belt assembly, and there are at least two steel grabbers, located on the side of the chain conveyor closer to the first conveyor belt assembly and the side closer to the second conveyor belt assembly, respectively.

[0009] Furthermore, the first conveyor belt assembly includes a first conveyor belt arranged parallel to the chain conveyor and a third conveyor belt connected to the first conveyor belt for passing through the scrap steel transfer workshop to connect to the underground silo. The third conveyor belt is arranged perpendicular to the first conveyor belt.

[0010] Furthermore, the scrap steel basket conveying assembly includes an intermediate hopper connected to the second conveyor belt, scrap steel basket conveying tracks located on both sides of the intermediate hopper, a scrap steel basket transport flatbed slidably connected to the scrap steel basket conveying tracks, and a basket located on the scrap steel basket transport flatbed slidably connected to the scrap steel basket conveying tracks.

[0011] Furthermore, the scrap steel basket conveying track is connected to the underground silo of the scrap steel transfer workshop.

[0012] Furthermore, a fourth scrap steel pool is located near the second conveyor belt, and the scrap steel in the fourth scrap steel pool is transported to the second conveyor belt by an overhead crane.

[0013] Furthermore, the electric arc furnace scrap supply system also includes an auxiliary feeding system located between the first scrap pool and the second scrap pool. The auxiliary feeding system includes a guide rail parallel to the first and second feeding sections and a steel grabbing device that can slide along the guide rail. The steel grabbing device is used to transport the scrap steel in the first or second scrap pool to the first or second feeding section that needs to be replenished with scrap steel.

[0014] Furthermore, the steel-grabbing device is either a steel-grabbing machine or an overhead crane.

[0015] The electric arc furnace scrap steel supply system provided by this invention, while meeting the needs of electric arc furnace smelting, utilizes the existing converter steelmaking workshop to rationally arrange the various facilities of the scrap steel supply system. Through multiple scrap steel feeding methods, it ensures smooth scrap steel logistics, short scrap steel transfer cycle, and clear division of labor among the scrap steel transfer facilities. The electric arc furnace scrap steel supply system of this invention can not only meet the scrap steel supply needs of large-capacity, short-cycle horizontal continuous feeding electric arc furnaces, but is also particularly suitable for steel enterprises to carry out all-scrap steel smelting when converting from a long converter process to a short electric arc furnace process. Attached Figure Description

[0016] Figure 1 This is a top view schematic diagram of the structure of an electric furnace scrap steel supply system according to an embodiment of the present invention. Detailed Implementation

[0017] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0018] Figure 1 The structure of an electric arc furnace scrap supply system 100 according to an embodiment of the present invention is shown. Figure 1 As shown, the electric arc furnace scrap steel supply system 100 may include: a first electric arc furnace scrap steel supply system 1 and a second electric arc furnace scrap steel supply system 2 arranged in parallel. The first electric arc furnace scrap steel supply system 1 may include a first scrap steel pool 11 arranged outside the first charging section 31 of the first electric arc furnace, a first conveyor belt assembly 12 arranged inside the first charging section 31 and vertically connected to the first charging section 31, and the first conveyor belt assembly 12 is connected to the underground silo 4 of the scrap steel transfer workshop. The second electric arc furnace scrap steel supply system 2 may include a second scrap steel pool 21 arranged outside the second charging section 32 of the second electric arc furnace, a second conveyor belt 22 arranged inside the second charging section 32 and vertically connected to the second charging section 32, and a scrap steel basket conveying assembly 23 connected to the second conveyor belt 22. The first feeding section 31 and the second feeding section 32 are arranged at intervals in the same straight direction, and the material conveying directions of the first feeding section 31 and the second feeding section 32 are opposite. The scrap steel in the underground silo 4 enters the first feeding section 31 via the first conveyor belt assembly 12, or is transported to the first scrap steel pool 11, the second scrap steel pool 21 and the scrap steel basket conveying assembly 23 via the truck 5. The scrap steel basket conveying assembly 23 transports the scrap steel to the second feeding section 32 via the second conveyor belt 22.

[0019] The electric arc furnace scrap supply system 100 of this invention, through the arrangement of the above-mentioned components, allows the electric arc furnace and the corresponding electric arc furnace scrap supply system to be arranged in the workshop with less space. Especially in the process of converting a converter workshop into an electric arc furnace workshop, this arrangement can make fuller use of the old, smaller converter workshop, allowing two large-capacity smelting electric arc furnaces (i.e., the first electric arc furnace and the second electric arc furnace) to be arranged in the limited area of ​​the old converter workshop. At the same time, it can realize the transfer and transportation of scrap steel into the electric arc furnace in a short time, solving the problem of difficult scrap steel transfer in the process of converting a converter workshop into an electric arc furnace workshop in the prior art. On the other hand, by combining multiple transportation methods, scrap steel can be entered into the electric arc furnace through multiple transportation and allocation methods, which makes the transfer and transportation of scrap steel in the workshop more efficient, realizing the "fast-paced, converter-like" production of the electric arc furnace.

[0020] In such Figure 1In the preferred embodiment shown, the first electric arc furnace scrap supply system 1 may further include a chain conveyor 13 vertically connected to the inner side of the first feeding section 31 and at least one scrap grabber 14 located near the chain conveyor 13. The chain conveyor 13 is arranged parallel to the first conveyor belt assembly 12. A third scrap pool 15 is also arranged near the chain conveyor 13. The scrap grabber 14 is used to grab scrap steel from the third scrap pool 15 and send it to the chain conveyor 13. In this embodiment, the chain conveyor 13 and the conveyor belt are combined in the first electric arc furnace scrap supply system 1. The two can feed the first feeding section 31 at different speeds simultaneously to achieve a more compact feeding of the first feeding section, thereby improving the conveying efficiency of scrap steel into the electric arc furnace.

[0021] Preferably, the chain conveyor 13 is required to have strong adaptability to scrap steel, and the bottom plate of the trough can be made of 16Mn. More preferably, the horizontal section of the chain conveyor 13 can be equipped with a guide trough, mainly using two steel grabbers to feed simultaneously. At the same time, the width of the guide trough must also meet the requirements of electric disk feeding.

[0022] Preferably, the chain conveyor 13 can be equipped with two variable frequency motors. If one motor fails, the other can operate independently to complete the production work. It is also preferred that the chain conveyor 13 be positioned near a column in the factory building to prevent scrap steel from falling and damaging the variable frequency motor. Furthermore, the chain conveyor 13 can be interlocked with the electric furnace's host computer for control, enabling both remote and local operation. Additionally, walkways for easy maintenance can be provided on both sides of the chain conveyor 13.

[0023] According to the present invention, the chain conveyor 13 can be arranged in various ways.

[0024] In such Figure 1 In the preferred embodiment shown, the chain conveyor 13 may be located on the side of the first conveyor belt assembly 12 away from the second conveyor belt 22, and the steel grabber 14 may be located on the side away from the first conveyor belt assembly 12. In this embodiment, the chain conveyor 13 can only be used in the first electric furnace scrap supply system 1 to feed the first electric furnace.

[0025] In another preferred embodiment, the chain conveyor 13 may be located between the first conveyor belt assembly 12 and the second conveyor belt 22, and there are at least two scrap grabbers 14, located on the side of the chain conveyor 13 closest to the first conveyor belt assembly 12 and the side closest to the second conveyor belt 22, respectively. In this embodiment, the scrap grabber 14 located on the side of the chain conveyor 13 closest to the first conveyor belt assembly 12 can feed scrap steel to the first conveyor belt assembly 12, thereby allowing the scrap steel to enter the first feeding section 31, while the scrap grabber 14 located on the chain conveyor 13 closest to the second conveyor belt 22 can grab the scrap steel on the chain conveyor 13 and transfer it to the second conveyor belt 22 or the second feeding section. This arrangement can simultaneously supply material to both the first and second electric furnaces.

[0026] In this embodiment, and more preferably, the chain conveyor 13 is configured as a movable chain conveyor, which can be raised and lowered in the height direction so that when it is necessary to move the chain conveyor 13, it can be lowered to a height lower than the first conveyor belt 121 and moved between the first conveyor belt 121 and the second conveyor belt 22.

[0027] According to the present invention, in such Figure 1 In the preferred embodiment shown, the first conveyor belt assembly 12 may include a first conveyor belt 121 arranged parallel to the chain conveyor 13 and a third conveyor belt 122 connected to the first conveyor belt 121 for passing through the scrap steel transfer workshop to connect to the underground silo 4. The third conveyor belt 122 is arranged perpendicular to the first conveyor belt 121. This arrangement allows scrap steel to be directly transported from the scrap steel source (i.e., the underground silo 4) to the first feeding section 31 via the first conveyor belt assembly 12. Since the source transport distance is relatively long, the combination of the chain conveyor 13 and the first conveyor belt assembly 12 is more conducive to improving the conveying efficiency.

[0028] In this embodiment, the unloading method of the first conveyor belt 121, the third conveyor belt 122 and the second conveyor belt 22 can all be head unloading. The drive roller can preferably be a rubber-coated roller. All exposed rotating and moving parts must be equipped with protective covers, protective fences or protective railings to ensure normal and stable operation.

[0029] In order to minimize the structural composition of the electric arc furnace scrap steel supply system 100 and further reduce the space occupied by the electric arc furnace scrap steel supply system 100, the scrap steel in the scrap steel basket conveying assembly 23 of the electric arc furnace scrap steel supply system 100 in this embodiment of the invention can be directly obtained from the scrap steel source (i.e., the underground silo 4) by truck.

[0030] In such Figure 1 In the preferred embodiment shown, the scrap steel basket conveying assembly 23 may include an intermediate hopper 231 connected to the second conveyor belt 22, scrap steel basket conveying tracks 232 located on both sides of the intermediate hopper 231, a scrap steel basket transport flatbed 233 slidably connected to the scrap steel basket conveying tracks 232, and a basket 234 located on the scrap steel basket transport flatbed 233. The truck 5 can transport baskets filled with scrap steel to the scrap steel basket transport flatbed 233. The scrap steel basket transport flatbed 233 runs along the scrap steel basket conveying tracks 232 to the intermediate hopper 231. The overhead crane 6 places the scrap steel from the basket 234 into the intermediate hopper 231. The intermediate hopper 231 provides sufficient scrap steel for the second conveyor belt 22, ensuring a continuous scrap steel conveying rhythm on the second conveyor belt 22.

[0031] Preferably, the material basket 234 can be made of steel plate into an elliptical shape, with lifting lugs on both sides and a movable bottom that can be opened to both sides at the same time, so as to add the scrap steel in the material basket 234 into the intermediate silo 231 in one or multiple times.

[0032] In another preferred embodiment, the scrap steel basket conveying track 232 can also be connected to the underground silo 4 of the scrap steel transfer workshop. This arrangement eliminates the need for trucks 5 to transport scrap steel, while the scrap steel in the underground silo 4 can be directly conveyed into the scrap steel basket conveying assembly 23 via the track.

[0033] According to the present invention, such as Figure 1 As shown, a fourth scrap steel pool 24 can also be arranged near the second conveyor belt 22. The scrap steel in the fourth scrap steel pool 24 is transported to the second conveyor belt 22 by the overhead crane 6. The conveying process can be automated by automatic control to realize the automation of the entire conveying process.

[0034] It should be noted that the scrap steel in each scrap steel pool can be transported and replenished by truck 5 from the underground silo 4.

[0035] Preferably, multiple second conveyor belt machines 22 can be set up as needed, and each second conveyor belt machine 22 is perpendicularly connected to the second feeding section 32. Similarly, multiple first conveyor belt machines 121 can also be set up as needed, and the beginning of each second conveyor belt machine 121 is perpendicularly connected to the first feeding section 31, and the end of each second conveyor belt machine 121 is connected to the third conveyor belt machine 122.

[0036] In a preferred embodiment, the chain conveyor 13 may be located between two parallel first conveyor belts 121, and there are at least two steel grabbers 14, respectively located between the chain conveyor 13 and the first conveyor belts 121. This arrangement allows the steel grabbers 14 to simultaneously serve both first conveyor belts 121 and the chain conveyor 13, which is beneficial for further improving conveying efficiency.

[0037] According to the present invention, in order to further improve the conveying efficiency of scrap steel, the electric arc furnace scrap steel supply system 100 may further include an auxiliary feeding system 7 located between the first scrap steel pool 11 and the second scrap steel pool 21. The auxiliary feeding system 7 may include a guide rail 72 parallel to the first feeding section 31 and the second feeding section 32 and a steel grabbing device 71 that can slide along the guide rail 72. The steel grabbing device 71 is used to convey the scrap steel in the first scrap steel pool 11 or the second scrap steel pool 21 to the first feeding section 31 or the second feeding section 32 that needs to be replenished with scrap steel.

[0038] Preferably, the steel-grabbing device 71 can be Figure 1 The steel grabber 14 or overhead crane 6 is shown.

[0039] The electric arc furnace scrap supply system 100 of this invention, while meeting the needs of electric arc furnace smelting, utilizes the existing converter steelmaking workshop to rationally arrange the various facilities of the scrap supply system. Through multiple scrap feeding methods, it ensures smooth scrap logistics, short scrap transport cycle, and clear division of labor among the scrap transport facilities. The electric arc furnace scrap supply system of this invention can not only meet the scrap supply needs of large-capacity, short-cycle horizontal continuous feeding electric arc furnaces, but is also particularly suitable for steel enterprises to carry out all-scrap smelting when converting from a long converter process to a short electric arc furnace process.

[0040] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0041] In the description of this application, it should be understood that the terms "inner side", "outer side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention.

[0042] Furthermore, the terms “first”, “second”, etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An electric arc furnace scrap steel supply system, characterized in that, include: A first electric arc furnace scrap steel supply system and a second electric arc furnace scrap steel supply system are arranged in parallel. The first electric arc furnace scrap steel supply system includes a first scrap steel pool located outside the first charging section of the first electric arc furnace, a first conveyor belt assembly located inside the first charging section and perpendicularly connected to the first charging section, and the first conveyor belt assembly is connected to an underground silo in the scrap steel transfer workshop. The second electric arc furnace scrap steel supply system includes a second scrap steel pool located outside the second charging section of the second electric arc furnace, a second conveyor belt located inside the second charging section and perpendicularly connected to the second charging section, and a scrap steel basket conveying assembly connected to the second conveyor belt assembly. The first charging section and the second charging section are arranged at intervals in the same straight direction, and the material conveying directions of the first charging section and the second charging section are opposite. Scrap steel in the underground silo enters the first charging section via the first conveyor belt assembly, or is transported by truck to the first scrap steel pool, the second scrap steel pool, and the scrap steel basket conveying assembly. The scrap steel basket conveying assembly transports the scrap steel to the second charging section via the second conveyor belt assembly. The first electric arc furnace scrap steel supply system also includes a chain conveyor vertically connected to the inner side of the first feeding section and at least one steel grabber located near the chain conveyor. The chain conveyor is arranged parallel to the first conveyor belt assembly. A third scrap steel pool is also arranged near the chain conveyor. The steel grabber is used to grab scrap steel from the third scrap steel pool and send it to the chain conveyor. The scrap steel basket conveying assembly includes an intermediate hopper connected to the second conveyor belt, scrap steel basket conveying tracks located on both sides of the intermediate hopper, a scrap steel basket transport flatbed slidably connected to the scrap steel basket conveying tracks, and a basket located on the scrap steel basket transport flatbed slidably connected to the scrap steel basket transport tracks. The electric arc furnace scrap steel supply system also includes an auxiliary feeding system located between the first scrap steel pool and the second scrap steel pool. The auxiliary feeding system includes a guide rail parallel to the first feeding section and the second feeding section and a steel grabbing device that can slide along the guide rail. The steel grabbing device is used to transport the scrap steel in the first scrap steel pool or the second scrap steel pool to the first feeding section or the second feeding section that needs to be replenished with scrap steel.

2. The electric arc furnace scrap supply system according to claim 1, characterized in that, The chain conveyor is located on the side of the first conveyor belt assembly away from the second conveyor belt, and the steel grabber is located on the side away from the first conveyor belt assembly.

3. The electric arc furnace scrap supply system according to claim 1, characterized in that, The chain conveyor is located between the first conveyor belt assembly and the second conveyor belt. There are at least two steel grabbers, which are located on the side of the chain conveyor closer to the first conveyor belt assembly and the side closer to the second conveyor belt assembly, respectively.

4. The electric arc furnace scrap supply system according to claim 2 or 3, characterized in that, The first conveyor belt assembly includes a first conveyor belt arranged parallel to the chain conveyor and a third conveyor belt connected to the first conveyor belt for passing through the scrap steel transfer workshop to connect to the underground silo. The third conveyor belt is arranged perpendicular to the first conveyor belt.

5. The electric arc furnace scrap supply system according to claim 1, characterized in that, The scrap steel basket conveying track is connected to the underground silo of the scrap steel transfer workshop.

6. The electric arc furnace scrap supply system according to claim 1, characterized in that, A fourth scrap steel pool is also arranged near the second conveyor belt, and the scrap steel in the fourth scrap steel pool is transported to the second conveyor belt by an overhead crane.

7. The electric arc furnace scrap supply system according to claim 1, characterized in that, The steel-grabbing device is a steel-grabbing machine or an overhead crane.

Images