An electric arc furnace continuous production system

Abstract

The present application relates to the technical field of steelmaking, and particularly relates to an electric arc furnace continuous production system, which can quickly guide the flue gas generated in a steelmaking cavity out through a flue gas exhaust pipe communicated with the steelmaking cavity, and supply the flue gas to a preheating process in a previous process after treatment, and form an upward airflow in a dust removal channel through an exhaust structure arranged at the top of the dust removal channel and an air inlet mechanism arranged at the bottom of the dust removal channel, so that dust and other impurities in the upward airflow can be guided out for unified recovery and treatment. The first air inlet mechanism comprising a first air inlet fan, a first air inlet pipe and a first air distribution structure, and the second air inlet mechanism comprising a second air inlet fan, a second air inlet pipe and a second air distribution structure, supply air from both sides of the bottom of the dust removal channel, so that the upward airflow is more evenly distributed in the dust removal channel.

Description

Technical Field

[0001] This invention relates to the field of steelmaking technology, specifically to a continuous production system for an electric arc furnace. Background Technology

[0002] Electric arc furnaces are commonly used in steelmaking because they have advantages such as short process, high efficiency and environmental friendliness. In the process of steelmaking in an electric arc furnace, the compressed scrap steel stacks are transported into the electric arc furnace by a pusher based on a horizontal feeding device. The high temperature generated by the electric arc of the electrodes melts the scrap steel into molten scrap steel, and the arc zone temperature can reach 3000°C.

[0003] Chinese patent CN218932205U discloses a primary combustion-assisted heating electric arc furnace steelmaking equipment. It provides an electric arc furnace steelmaking equipment that can quickly cool the electrode body. However, it cannot effectively handle the flue gas generated by the electric arc furnace. Directly emitting this flue gas not only poses environmental problems but also wastes a large amount of thermal energy.

[0004] Chinese patent CN216864224U discloses a horizontal continuous feeding device for preheating scrap steel in an electric arc furnace. It uses the flue gas generated by the electric arc furnace to preheat the scrap steel to be steelred. However, in the entire process, the preceding processes have already carried out dust removal treatment. Directly introducing the flue gas will cause the scrap steel to re-adsorb a certain amount of dust and other impurities. If these impurities are transported back into the electric arc furnace, they will affect the configuration of auxiliary materials during the electric arc furnace steelmaking process, and to a certain extent, affect the quality of steelmaking.

[0005] Chinese patent CN2906510Y discloses a horizontal continuous feeding scrap preheating device for an electric arc furnace. It preheats the scrap steel to be steeled using flue gas. However, in actual production, since the scrap steel used for steelmaking is mostly recycled steel products and has been piled up for a long time in the compression molding process, there are certain dust, stones and other impurities in the scrap steel pile. These impurities can affect the configuration of lime, dolomite, carbon powder and other materials in electric arc furnace steelmaking, thus affecting the quality of steelmaking to some extent.

[0006] Chinese patent CN204255095U discloses a steelmaking electric furnace charging car that directly feeds materials from above the furnace chamber, but it cannot perform preheating or dust removal on the scrap steel raw materials. Summary of the Invention

[0007] To address the above problems, this invention provides a continuous production system for an electric arc furnace.

[0008] The adopted technical solution is an electric arc furnace continuous production system, including an electric arc furnace body, a horizontal feeding device, a scrap steel dust removal device, and a feeding preheating device. An electrode rod is inserted into the top of the electric arc furnace body, and one end of the electrode rod is connected to a power transmission line. An electric arc furnace feed port is provided on one side of the electric arc furnace body and is connected to the preheating device through the electric arc furnace feed port. An auxiliary material adding mechanism and a flue gas exhaust pipe are provided on the top of the electric arc furnace body. A steelmaking chamber is provided inside the electric arc furnace body. A feeding net is provided at the bottom of the steelmaking chamber, and a feeding pipe is provided at the bottom of the steelmaking chamber.

[0009] The horizontal feeding device includes a conveying trough, on both sides of which are provided scrap steel storage platforms. One end of the conveying trough is connected to a dust removal device, and the other end of the conveying trough is provided with a propulsion mechanism that can push the scrap steel in the conveying trough into the dust removal device. A shock-absorbing mechanism is provided between the conveying trough and the scrap steel storage platforms. A transfer mechanism is provided on the scrap steel storage platforms that can transfer the scrap steel on the scrap steel storage platforms into the conveying trough.

[0010] The scrap steel dust removal device includes a dust removal channel, one end of which is connected to a conveying trough and the other end of which is connected to a buffer pipe. The top of the dust removal channel is provided with an exhaust structure, and the bottom of the dust removal channel is connected to an air inlet mechanism. The airflow entering the dust removal channel through the air inlet mechanism can be discharged from the exhaust structure.

[0011] The feeding preheating device includes a preheating channel, which is connected to a buffer pipe. The other end of the preheating channel is connected to the feed inlet of the electric arc furnace. A preheating chamber is provided inside the preheating channel. A preheating air inlet mechanism and a preheating air outlet mechanism are provided on the preheating channel. A preheating pipe is provided in the interlayer of the preheating channel. Along the scrap steel conveying direction in the preheating channel, the preheating air inlet mechanism is close to the feed inlet of the electric arc furnace and is connected to the exhaust gas pipe after dust removal. The preheating air outlet mechanism is close to the buffer pipe and is connected to the exhaust gas pipe after dust removal.

[0012] Furthermore, the auxiliary material addition mechanism includes an auxiliary material batching tank and an auxiliary material addition pipe. The auxiliary material batching tank is connected to the lime silo, carbon ball silo, and magnesium ball silo. The bottom outlet of the auxiliary material batching tank is connected to the top of the electric arc furnace body through the auxiliary material addition pipe.

[0013] Optionally, one end of the flue gas exhaust pipe is connected to the top of the electric arc furnace body, and the other end is connected to the air inlet of the bag filter box, wherein the air outlet of the bag filter box is connected to the air conveying mechanism.

[0014] Optionally, the air supply mechanism includes an air supply branch pipe, an air supply main pipe, and a dust removal exhaust gas supply pipe. The air supply branch pipe is connected to the air supply main pipe. One end of the dust removal exhaust gas supply pipe is connected to the air supply main pipe, and the other end is connected to the preheating device. The exhaust gas supply pipe is located behind the air supply branch pipe, along the gas flow direction in the air supply main pipe.

[0015] Furthermore, an oxygen injection gun is installed on the inner wall of the electric arc furnace body.

[0016] Optionally, the bottom of the electric arc furnace body protrudes to one side to form an arc surface, and the feeding pipe is located at the arc surface.

[0017] Furthermore, the exhaust structure includes an exhaust duct and an exhaust branch duct. The exhaust duct is located above the dust removal channel, and one end of the exhaust branch duct is connected to the top of the dust removal channel, while the other end of the exhaust branch duct is connected to the exhaust duct.

[0018] Optionally, the exhaust structure includes multiple exhaust branch pipes, which are arranged at the same interval, and the vertical projection of the exhaust branch pipes is located below the vertical projection of the exhaust pipe.

[0019] Optionally, the air intake mechanism includes a first air intake mechanism and a second air intake mechanism, and the first air intake mechanism and the second air intake mechanism are respectively located on both sides of the dust removal channel.

[0020] Furthermore, the first air intake mechanism includes a first air intake fan, a first air intake pipe, and a first air distribution structure. The first air distribution structure is located inside the dust removal channel and at the bottom of the dust removal channel. One end of the first air intake pipe is connected to the air outlet of the first air intake fan, and the other end of the first air intake pipe is connected to the first air distribution structure.

[0021] The second air intake mechanism includes a second air intake fan, a second air intake pipe, and a second air distribution structure. The second air distribution structure is located inside the dust removal channel and is positioned opposite to the first air distribution structure at the bottom of the dust removal channel. One end of the second air intake pipe is connected to the air outlet of the second air intake fan, and the other end of the second air intake pipe is connected to the second air distribution structure.

[0022] Optionally, the first air distribution structure and the second air distribution structure have the same structure.

[0023] Furthermore, the first air distribution structure includes symmetrically arranged fixed plates, and there are air distribution grooves between the symmetrically arranged fixed plates. An air distribution port is provided at the bottom of the air distribution groove, and the air distribution port is connected to the first air inlet pipe.

[0024] Optionally, a screen may be installed inside the air distribution trough.

[0025] Furthermore, one end of the fixed plate along the dust removal channel is an inclined surface.

[0026] Furthermore, the preheating air intake mechanism includes a first fixed ring, an air intake component, and a first limiting component. The first fixed ring is connected to the exhaust gas transmission pipe after dust removal. An airflow channel is provided inside the first fixed ring, and the airflow channel is connected to the air intake component. The first fixed ring is located on the outer periphery of the preheating channel. The air intake component can preheat the preheating channel. The first limiting component connects the first fixed ring to the preheating channel.

[0027] Optionally, the preheating gas outlet mechanism includes a second fixed ring, an outlet component, and a second limiting component. The second fixed ring is connected to the exhaust pipe of the exhaust gas after dust removal. An airflow channel is provided inside the second fixed ring, and the airflow channel is connected to the outlet component. The second fixed ring is located on the outer periphery of the preheating channel. The outlet component can discharge the preheated gas from the preheating channel. The second limiting component connects the second fixed ring to the preheating channel.

[0028] Optionally, the air intake component includes a first air intake pipe, a second air intake pipe, a third air intake pipe, and a fourth air intake pipe, and the air outlet component includes a first air outlet pipe, a second air outlet pipe, a third air outlet pipe, and a fourth air outlet pipe.

[0029] Furthermore, one end of the first intake pipe is connected to the internal airflow channel of the first fixed ring, and the other end is inserted into the preheating channel from the top and connected to the first preheating pipe provided in the top interlayer of the preheating channel. One end of the second intake pipe is connected to the internal airflow channel of the first fixed ring, and the other end is inserted into the preheating channel from the side and connected to the second preheating pipe provided in the side interlayer of the preheating channel. One end of the third intake pipe is connected to the internal airflow channel of the first fixed ring, and the other end is inserted into the preheating channel from the side and connected to the third preheating pipe provided in the side interlayer of the preheating channel. The third preheating pipe and the second preheating pipe are arranged opposite to each other. One end of the fourth intake pipe is connected to the internal airflow channel of the first fixed ring, and the other end is inserted into the preheating channel from the bottom and connected to the fourth preheating pipe provided in the bottom interlayer of the preheating channel.

[0030] One end of the first vent pipe is connected to the internal airflow channel of the second fixed ring, and the other end is inserted into the preheating channel from the top and connected to the first preheating pipe located in the top interlayer of the preheating channel. One end of the second vent pipe is connected to the internal airflow channel of the second fixed ring, and the other end is inserted into the preheating channel from the side and connected to the second preheating pipe located in the side interlayer of the preheating channel. One end of the third vent pipe is connected to the internal airflow channel of the second fixed ring, and the other end is inserted into the preheating channel from the side and connected to the third preheating pipe located in the side interlayer of the preheating channel. The third preheating pipe and the second preheating pipe are arranged opposite to each other. One end of the fourth vent pipe is connected to the internal airflow channel of the second fixed ring, and the other end is inserted into the preheating channel from the bottom and connected to the fourth preheating pipe located in the bottom interlayer of the preheating channel.

[0031] Optionally, both the first limiting component and the second limiting component include an upper limiting hook and a lower limiting hook. One end of the upper limiting hook in the first limiting component is fitted onto the first fixing ring, and the other end is connected to the top of the preheating channel.

[0032] One end of the lower limit hook in the first limiting component is fitted onto the first fixing ring, and the other end is connected to the bottom of the preheating channel;

[0033] The upper limit hook in the second limiting component is fitted onto the first fixing ring at one end, and connected to the top of the preheating channel at the other end.

[0034] One end of the lower limit hook in the second limiting component is fitted onto the first fixing ring, and the other end is connected to the bottom of the preheating channel.

[0035] Furthermore, the scrap steel on the scrap steel storage platform is vertically positioned above the conveyor trough.

[0036] Optionally, the shock absorption mechanism includes a first shock absorption plate and a second shock absorption plate. The second shock absorption plate is located above the first shock absorption plate. One end of the second shock absorption plate is connected to the scrap steel storage platform, and the bottom of the second shock absorption plate is connected to the first shock absorption plate via a connecting rod. One end of the first shock absorption plate is connected to the top of the conveying trough.

[0037] Optionally, both the first and second damping plates are inclined.

[0038] Furthermore, the conveying mechanism includes a support rod, a crossbar, and a suction cup component. The crossbar is mounted above the conveying trough, and both ends of the crossbar are connected to the support rod. The support rod is mounted on a fixed frame, which is located on the side of the scrap steel storage platform away from the conveying trough.

[0039] The beneficial effects of the present invention include at least one of the following;

[0040] 1. By setting up a flue gas exhaust pipe connected to the steelmaking chamber, the flue gas generated in the steelmaking chamber can be quickly discharged and, after treatment, used for the preheating process in the preceding process.

[0041] 2. By setting up an auxiliary material addition mechanism connected to the steelmaking chamber, the mixed auxiliary material powder after being properly formulated is added into the steelmaking chamber during the steelmaking process.

[0042] 3. By setting up a feeding net located in the steelmaking chamber and simultaneously on the feeding pipe, scrap steel that has not been completely melted by electric arc and other large-sized impurities can be blocked, preventing them from accumulating at the feeding pipe.

[0043] 4. Through the exhaust structure at the top of the dust removal channel and the air inlet mechanism at the bottom of the dust removal channel, an upward airflow is formed in the dust removal channel. Since the scrap steel is a stack of scrap steel formed in the previous process, it has many gaps. The upward airflow can export dust and other impurities for unified recycling.

[0044] 5. By setting a first air intake mechanism including a first air intake fan, a first air intake pipe and a first air distribution structure, and a second air intake mechanism including a second air intake fan, a second air intake pipe and a second air distribution structure, air is supplied from both sides of the bottom of the dust removal channel, so that the rising airflow is more evenly distributed in the dust removal channel.

[0045] 6. By setting up a preheating channel with a jacket, the high-temperature flue gas from the electric arc furnace can enter the preheating tube in the jacket of the preheating channel through the preheating inlet mechanism to preheat the scrap steel in the preheating channel, and finally be discharged from the preheating outlet mechanism. This avoids direct contact between the flue gas and the scrap steel, thus greatly ensuring the significance of dust removal in the preceding process.

[0046] 7. A horizontal scrap steel feeding device with two dimensions is provided. In one dimension, scrap steel is conveyed from a scrap steel storage platform to a conveying trough via a shock-absorbing mechanism. In the other dimension, a transfer mechanism is used to transfer the scrap steel to the conveying trough, and then a propulsion mechanism is used to convey it towards the steelmaking furnace. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of an electric arc furnace structure;

[0048] Figure 2 A top view schematic diagram of an electric arc furnace structure;

[0049] Figure 3 This is a schematic diagram of the flue gas exhaust pipe connection structure;

[0050] Figure 4 This is a schematic diagram of the horizontal feeding device.

[0051] Figure 5 This is a schematic diagram of the end structure of the horizontal feeding device;

[0052] Figure 6 This is a schematic diagram of a scrap steel dust removal device.

[0053] Figure 7 This is a schematic diagram of the end structure of a scrap steel dust removal device;

[0054] Figure 8 This is a schematic diagram of the side structure of the dust removal channel;

[0055] Figure 9 This is a schematic diagram of the first air distribution structure;

[0056] Figure 10 This is a schematic diagram of the feeding and preheating device.

[0057] Figure 11 A schematic diagram of the internal structure of the feeding and preheating device;

[0058] Figure 12 This is a schematic diagram of the preheating intake mechanism.

[0059] Figure 13 This is a schematic diagram of the preheating air outlet mechanism;

[0060] The attached diagram is labeled as follows: 1 for propulsion motor, 2 for push plate, 3 for first damping plate, 4 for second damping plate, 5 for fixed frame, 6 for support rod, 7 for suction cup component, 8 for telescopic rod, 9 for push plate, 10 for conveying trough, 11 for crossbar, 12 for scrap steel storage platform, 13 for scrap steel, 20 for dust removal channel, 21 for exhaust pipe, 22 for first air intake fan, 23 for second air intake fan, 24 for first air intake pipe, 25 for second air intake pipe, 26 for reinforcing rib, 27 for exhaust branch pipe, 28 for first air distribution structure, 29 for second air distribution structure, 30 for fixed plate, 31 for air distribution trough, 32 for screen, 33 for air distribution outlet, 40 for preheating channel, 41 for electric arc furnace feed inlet, 42 for first fixing ring, 43 for second fixing ring, 4 4 is a buffer pipe, 45 is an upper limit hook, 46 is a lower limit hook, 47 is a tail gas supply pipe after dust removal, 48 is a first air inlet pipe, 49 is a second air inlet pipe, 50 is a third air inlet pipe, 51 is a fourth air inlet pipe, 52 is a first air outlet pipe, 53 is a second air outlet pipe, 54 is a third air outlet pipe, 55 is a fourth air outlet pipe, 56 is a tail gas exhaust pipe after dust removal, 57 is a first preheating pipe, 58 is a preheating chamber, 60 is the electric arc furnace body, 61 is the steelmaking chamber, 62 is an electrode rod, 63 is a flue gas exhaust pipe, 64 is a power transmission line, 65 is an auxiliary material addition pipe, 66 is an auxiliary material batching tank, 67 is molten steel, 68 is a feeding net, 69 is a feeding pipe, 70 is an oxygen lance, 71 is a bag filter dust collector, 72 is a branch air supply pipe, and 73 is a main air supply pipe. Detailed Implementation

[0061] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0062] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0063] like Figures 1 to 13As shown, a continuous production system for an electric arc furnace includes an electric arc furnace body 60, a horizontal feeding device, a scrap steel dust removal device, and a feeding preheating device. An electrode rod 62 is inserted into the top of the electric arc furnace body 60, with one end of the electrode rod 62 connected to a power transmission line 64. An electric arc furnace inlet 41 is provided on one side of the electric arc furnace body 60 and is connected to the preheating device through the inlet 41. An auxiliary material adding mechanism and a flue gas exhaust pipe 63 are provided at the top of the electric arc furnace body 60. A steelmaking chamber 61 is provided inside the electric arc furnace body 60, with a feeding net 68 at the bottom of the steelmaking chamber 61 and a feeding pipe 69 at the bottom of the steelmaking chamber 61.

[0064] The horizontal feeding device includes a conveying trough 10, on both sides of which are provided scrap steel storage platforms 12. One end of the conveying trough 10 is connected to a dust removal device, and the other end of the conveying trough 10 is provided with a pushing mechanism that can push the scrap steel 13 in the conveying trough 10 into the dust removal device. A shock-absorbing mechanism is provided between the conveying trough 10 and the scrap steel storage platform 12. A transfer mechanism is provided on the scrap steel storage platform 12 that can transfer the scrap steel 13 on the scrap steel storage platform 12 into the conveying trough 10.

[0065] The scrap steel dust removal device includes a dust removal channel 20. One end of the dust removal channel 20 is connected to the conveying trough 10, and the other end of the dust removal channel 20 is connected to the buffer pipe 44. The top of the dust removal channel 20 is provided with an exhaust structure, and the bottom of the dust removal channel 20 is connected to an air inlet mechanism. The airflow entering the dust removal channel 20 through the air inlet mechanism can be discharged from the exhaust structure.

[0066] The feeding preheating device includes a preheating channel 40, which is connected to a buffer pipe 44. The other end of the preheating channel 40 is connected to the electric arc furnace feed inlet 41. A preheating chamber 58 is provided inside the preheating channel 40. A preheating air inlet mechanism and a preheating air outlet mechanism are provided on the preheating channel 40. A preheating pipe is provided in the interlayer of the preheating channel 40. Along the scrap steel conveying direction inside the preheating channel 40, the preheating air inlet mechanism is close to the electric arc furnace feed inlet 41 and is connected to the dust removal exhaust gas pipe 47. The preheating air outlet mechanism is close to the buffer pipe 44 and is connected to the dust removal exhaust gas pipe 56.

[0067] The purpose of this design is to quickly exhaust the flue gas generated within the steelmaking chamber through a flue gas exhaust pipe connected to it, allowing it to be treated and used in the preheating process of the preceding stages. An auxiliary material addition mechanism connected to the steelmaking chamber allows for the addition of pre-mixed auxiliary material powder into the chamber during steelmaking. A feeding mesh located within the steelmaking chamber and simultaneously mounted on the feeding pipe effectively blocks incompletely arc-melted scrap steel and other large impurities, preventing their accumulation at the feeding pipe and significantly improving the overall utilization rate of the flue gas.

[0068] It should be noted that, due to the high temperature inside the steelmaking chamber, the feeding screens used are mostly made of ceramic or other refractory materials and are designed to withstand high temperatures.

[0069] By setting up a preheating channel with a jacket, the high-temperature flue gas from the electric arc furnace can enter the preheating pipes in the jacket of the preheating channel through the preheating inlet mechanism to preheat the scrap steel in the preheating channel, and finally be discharged from the preheating outlet mechanism. This avoids direct contact between the flue gas and the scrap steel, thus greatly ensuring the effectiveness of dust removal in the preceding process. Adopting a preheating flue gas inlet direction opposite to the scrap steel conveying direction in the preheating channel can, to some extent, create temperature convection, thereby improving preheating efficiency.

[0070] It should be noted that the improvements in this embodiment are mainly for the preheating of scrap steel, while the scrap steel conveying part can refer to the existing technology and use conveying rollers or conveying mesh belts to convey it toward the electric arc furnace.

[0071] By using the exhaust structure at the top of the dust removal channel and the air intake mechanism at the bottom of the dust removal channel, an upward airflow is formed inside the dust removal channel. Since the scrap steel is a stack of scrap steel formed in the previous process, it has many gaps. The upward airflow can export dust and other impurities for unified recycling.

[0072] This largely solves the problem that existing horizontal feeding devices often encounter issues in actual production. Since the scrap steel used in steelmaking is mostly recycled steel products, and it accumulates for a long time during the compression molding process, there are certain dust, stones, and other impurities in the scrap steel piles. These impurities can affect the preparation of lime, dolomite, carbon powder, etc. in electric arc furnace steelmaking, thus affecting the quality of steelmaking to some extent.

[0073] A scrap steel horizontal feeding device with two dimensions is provided. In one dimension, scrap steel is transported from the scrap steel storage platform to the conveying trough via a shock-absorbing mechanism. In the other dimension, the scrap steel is transported to the conveying trough via a set adjustment mechanism and then conveyed toward the steelmaking furnace via a propulsion mechanism.

[0074] Meanwhile, in this embodiment, the auxiliary material adding mechanism includes an auxiliary material mixing tank 66 and an auxiliary material adding pipe 65. The auxiliary material mixing tank 66 is connected to the lime silo, carbon ball silo, and magnesium ball silo. The bottom outlet of the auxiliary material mixing tank 66 is connected to the top of the electric arc furnace body 60 through the auxiliary material adding pipe 65.

[0075] The purpose of this design is to allow the auxiliary materials required for electric arc furnace steelmaking to be mixed evenly in the auxiliary material batching tank and then added to the electric arc furnace. In some application scenarios, one or more auxiliary materials can also be added to the electric arc furnace in sequence through the auxiliary material batching tank.

[0076] In this embodiment, one end of the flue gas exhaust pipe 63 is connected to the top of the electric arc furnace body 60, and the other end is connected to the air inlet of the bag filter dust collector 71. The air outlet of the bag filter dust collector 71 is connected to the air conveying mechanism. The air conveying mechanism includes an air conveying branch pipe 72, an air conveying main pipe 73, and a dust removal tail gas conveying pipe 47. The air conveying branch pipe 72 is connected to the air conveying main pipe 73. One end of the dust removal tail gas conveying pipe 47 is connected to the air conveying main pipe 73, and the other end is connected to the preheating device. Along the gas flow direction in the air conveying main pipe 73, the dust removal tail gas conveying pipe 47 is located behind the air conveying branch pipe 72.

[0077] The purpose of this design is to guide the flue gas generated during steelmaking in the electric arc furnace into a bag filter box through the flue gas exhaust pipe. Depending on the specific processing requirements, multiple bag filter boxes are usually arranged side by side to form a dust removal component. This dust removal component is used to remove dust and meet the environmental protection requirements for emissions.

[0078] Meanwhile, after dust removal, the temperature of the flue gas drops significantly, often remaining at 600°C, which can be used to preheat scrap steel stacks in the preheating process.

[0079] In actual use, there will be a large main air supply pipe, which is connected to the dust removal exhaust gas supply pipe. Part of the filtered flue gas in the main air supply pipe is used for preheating through the dust removal exhaust gas supply pipe, and another part of the filtered flue gas is used for other processes, or is discharged after being tested and meeting the emission standards.

[0080] In this embodiment, an oxygen injection gun 70 is provided on the inner wall of the electric arc furnace body 60.

[0081] The purpose of this design is to improve the overall steelmaking efficiency by using oxygen injection lances to achieve oxygen blowing during steelmaking.

[0082] In this embodiment, the bottom of the electric arc furnace body 60 protrudes to one side to form an arc surface, and the feeding pipe 69 is located at the arc surface.

[0083] Meanwhile, in this embodiment, the scrap steel 13 on the scrap steel storage platform 12 is located vertically above the conveying trough 10. The shock absorption mechanism includes a first shock absorption plate 3 and a second shock absorption plate 4. The second shock absorption plate 4 is located above the first shock absorption plate 3. One end of the second shock absorption plate 4 is connected to the scrap steel storage platform 12, and the bottom of the second shock absorption plate 4 is connected to the first shock absorption plate 3 through a connecting rod. One end of the first shock absorption plate 4 is connected to the top of the conveying trough 10. Both the first shock absorption plate 3 and the second shock absorption plate 4 are inclined. The inclination angle of the first shock absorption plate 3 in the horizontal direction is smaller than that of the second shock absorption plate 4 in the horizontal direction.

[0084] The purpose of this design is to effectively dampen the impact on the conveyor when scrap steel falls from the scrap steel storage platform onto the conveyor trough by setting up a damping mechanism that includes a first damping plate and a second damping plate.

[0085] It should be noted that, in order to facilitate the pushing of scrap steel on the scrap steel storage platform to the shock absorption mechanism, a pushing structure consisting of a pusher plate 9 and a telescopic rod 8 is usually installed on the scrap steel storage platform. After being compressed and formed, the scrap steel is placed on the scrap steel storage platform by conveyor belts, cranes and other transport components. Under the control of the motor, the telescopic rod drives the pusher plate 9 to move, so that the scrap steel moves toward the shock absorption mechanism and finally enters the conveying trough.

[0086] Meanwhile, in order to better push the scrap steel, the pusher plate 9 can be set to an arc shape or one end of it can be bent, so that the scrap steel is not easy to fall out of the pusher plate when pushing.

[0087] It should be noted that the propulsion mechanism used in this embodiment includes a propulsion motor 1, a push plate 2 and a push rod. The push plate 2 is located at the end of the conveying trough 10 and is connected to the power output end of the propulsion motor 1 through the push rod. In use, the propulsion motor 1 can push the push plate 2 toward the dust removal device through the push rod, thereby driving the scrap steel in the conveying trough 10 to move together.

[0088] Furthermore, in this embodiment, the upper surfaces of the first and second damping plates are provided with damping pads, which can reduce the impact when the scrap steel falls.

[0089] In this embodiment, the conveying mechanism includes a support rod 6, a crossbar 11, and a suction cup component 7. The crossbar 11 is mounted above the conveying trough 10, and both ends of the crossbar 11 are connected to the support rod 6. The support rod 6 is mounted on a fixed frame 5, which is located on the side of the scrap steel storage platform 12 away from the conveying trough 10.

[0090] The purpose of this design is to allow scrap steel that cannot be moved by the push structure consisting of push plate 9 and telescopic rod 8 through the suction cup component.

[0091] It should be noted that the suction cup component 7 used in this embodiment is an existing electromagnetic suction cup. Its specific structure can be found in Chinese Patent No. CN215854558U. Its main function is to adsorb scrap steel and complete the transportation based on the magnetic field generated by energization.

[0092] Meanwhile, in actual use, stepper motors and lifting ropes are inevitably used for the transport components, so that the suction cup components can be moved to the designated position. The specific setting method can be referred to Chinese patent with publication number CN207120230U. In general, the stepper motor is set on the crossbar 11. The stepper motor drives the lead screw to rotate. A movable seat matching the position of the electromagnetic chuck is set on the lead screw. At the same time, a motor controlling the up and down movement of the lifting rope is also set on the movable seat. The lifting rope is connected to the electromagnetic chuck. After the electromagnetic chuck is energized, it generates a magnetic field that can attract scrap steel.

[0093] It should be noted that the fixing frame 5 is located on the periphery of the scrap steel storage platform 12 to provide a base for the support rod 6, and the top of the fixing frame 5 is located above the top of the scrap steel storage platform 12.

[0094] Meanwhile, in this embodiment, the exhaust structure includes an exhaust pipe 21 and an exhaust branch pipe 27. The exhaust pipe 21 is located above the dust removal channel 20. One end of the exhaust branch pipe 27 is connected to the top of the dust removal channel 20, and the other end of the exhaust branch pipe 27 is connected to the exhaust pipe 21. The exhaust structure includes multiple exhaust branch pipes 27, which are arranged at the same interval, and the vertical projection of the exhaust branch pipe 27 is located below the vertical projection of the exhaust pipe 21.

[0095] It should be noted that in actual use, in order to ensure the overall mechanical strength of the dust removal channel, reinforcing ribs 26 will be installed around the outer perimeter of the dust removal channel.

[0096] Furthermore, the dust removal channel is divided into multiple sections by reinforcing ribs 26, and each section is equipped with an exhaust branch pipe and an air inlet mechanism. This allows for the formation of a relatively independent upward airflow in each section, thereby improving the overall dust removal efficiency.

[0097] Meanwhile, in this embodiment, the air intake mechanism includes a first air intake mechanism and a second air intake mechanism, and the first air intake mechanism and the second air intake mechanism are respectively disposed on both sides of the dust removal channel 20. The first air intake mechanism includes a first air intake fan 22, a first air intake pipe 24 and a first air distribution structure 28. The first air distribution structure 28 is disposed in the dust removal channel 20 and located at the bottom of the dust removal channel 20. One end of the first air intake pipe 24 is connected to the air outlet end of the first air intake fan 22, and the other end of the first air intake pipe 24 is connected to the first air distribution structure 28.

[0098] The second air intake mechanism includes a second air intake fan 23, a second air intake pipe 25, and a second air distribution structure 29. The second air distribution structure 29 is located inside the dust removal channel 20 and is arranged opposite to the first air distribution structure 28 at the bottom of the dust removal channel 20. One end of the second air intake pipe 25 is connected to the air outlet of the second air intake fan 23, and the other end of the second air intake pipe 25 is connected to the second air distribution structure 29.

[0099] The purpose of this design is to supply air from both sides of the bottom of the dust removal channel by setting up a first air intake mechanism including a first air intake fan, a first air intake duct and a first air distribution structure, and a second air intake mechanism including a second air intake fan, a second air intake duct and a second air distribution structure, so that the rising airflow is more evenly distributed in the dust removal channel.

[0100] In this embodiment, the first air distribution structure 28 and the second air distribution structure 29 have the same structure. The first air distribution structure 28 includes symmetrically arranged fixed plates 30, and there is an air distribution groove 31 between the symmetrically arranged fixed plates 30. An air distribution port 33 is provided at the bottom of the air distribution groove 31, and the air distribution port 33 is connected to the first air inlet pipe 24. A screen 32 is provided in the air distribution groove 31, and one end of the fixed plate 30 along the dust removal channel 20 is an inclined surface.

[0101] The purpose of this design is to set up a unique first and second air distribution structure, which can both protect the air distribution openings and slightly lift the scrap steel stack, making it easier for airflow to pass through the bottom of the scrap steel stack.

[0102] It should be noted that in the air distribution structure, the symmetrically arranged fixed plates are made of metal, with one end being a slope. Under the action of the pushing mechanism, the scrap steel stack will move upward along the slope, slightly lifting the scrap steel stack, and then continue to move forward until it reaches the horizontal section of the fixed plate. The air distribution vents can then lift the airflow upward. Since there are screens in the air distribution channels, debris such as stones in the scrap steel stack that cannot be affected by the rising airflow can be blocked, thus preventing the air distribution vents from becoming clogged.

[0103] Meanwhile, in this embodiment, the preheating air intake mechanism includes a first fixing ring 42, an air intake component, and a first limiting component. The first fixing ring 42 is connected to the exhaust gas pipe 47 after dust removal. An airflow channel is provided inside the first fixing ring 42, and the airflow channel is connected to the air intake component. The first fixing ring 42 is located on the outer periphery of the preheating channel 40. The air intake component can preheat the preheating channel 40. The first limiting component connects the first fixing ring 42 to the preheating channel 40. The preheating air outlet mechanism includes a second fixing ring 43, an air outlet component, and a second limiting component. The second fixing ring 43 is connected to the exhaust gas pipe 56 after dust removal. An airflow channel is provided inside the second fixing ring 43, and the airflow channel is connected to the air outlet component. The second fixing ring 43 is located on the outer periphery of the preheating channel 40. The air outlet component can discharge the preheated gas from the preheating channel 40. The second limiting component connects the second fixing ring 43 to the preheating channel 40.

[0104] The purpose of this design is to use a ring-shaped fixed ring to guide and discharge the flue gas, which, compared to directly connecting the gas pipeline to the preheating pipe, results in a smoother and more evenly distributed airflow. This allows the entire preheating channel to be heated evenly, without excessive temperature differences at the top, sides, and bottom.

[0105] In this embodiment, the air intake component includes a first air intake pipe 48, a second air intake pipe 49, a third air intake pipe 50, and a fourth air intake pipe 51. The air outlet component includes a first air outlet pipe 52, a second air outlet pipe 53, a third air outlet pipe 54, and a fourth air outlet pipe 55. One end of the first air intake pipe 48 is connected to the internal airflow channel of the first fixing ring 42, and the other end is inserted from the top into the preheating channel 40 and connected to the first preheating pipe 57 disposed in the top interlayer of the preheating channel 40. One end of the second air intake pipe 49 is connected to the internal airflow channel of the first fixing ring 42, and the other end is inserted from the top into the preheating channel 40 and connected to the first preheating pipe 57 disposed in the top interlayer of the preheating channel 40. The preheating channel 40 is inserted from the side and connected to the second preheating pipe in the side interlayer of the preheating channel 40. One end of the third air inlet pipe 50 is connected to the internal airflow channel of the first fixing ring 42, and the other end is inserted from the side into the preheating channel 40 and connected to the third preheating pipe in the side interlayer of the preheating channel 40. The third preheating pipe and the second preheating pipe are arranged opposite to each other. One end of the fourth air inlet pipe 51 is connected to the internal airflow channel of the first fixing ring 42, and the other end is inserted from the bottom into the preheating channel 40 and connected to the fourth preheating pipe in the bottom interlayer of the preheating channel 40.

[0106] One end of the first vent pipe 52 is connected to the internal airflow channel of the second fixing ring 43, and the other end is inserted into the preheating channel 40 from the top and connected to the first preheating pipe 57 located in the top interlayer of the preheating channel 40. One end of the second vent pipe 53 is connected to the internal airflow channel of the second fixing ring 43, and the other end is inserted into the preheating channel 40 from the side and connected to the second preheating pipe located in the side interlayer of the preheating channel 40. One end of the third vent pipe 54 is connected to the internal airflow channel of the second fixing ring 43, and the other end is inserted into the preheating channel 40 from the side and connected to the third preheating pipe located in the side interlayer of the preheating channel 40. The third preheating pipe and the second preheating pipe are arranged opposite to each other. One end of the fourth vent pipe 55 is connected to the internal airflow channel of the second fixing ring 43, and the other end is inserted into the preheating channel 40 from the bottom and connected to the fourth preheating pipe located in the bottom interlayer of the preheating channel 40.

[0107] The purpose of this design is to allow the high-temperature flue gas input from the exhaust gas pipe 47 after dust removal to the first fixed ring 42 to enter the corresponding preheating pipes through the airflow channels in the first fixed ring, respectively, via the first inlet pipe 48, the second inlet pipe 49, the third inlet pipe 50, and the fourth inlet pipe 51.

[0108] In practical use, the preheating pipe is usually set in a serpentine shape, which can increase the residence time of high-temperature flue gas in the pipe. Finally, it enters the second fixed ring from the first outlet pipe 52, the second outlet pipe 53, the third outlet pipe 54 and the fourth outlet pipe 55 and is discharged through the exhaust pipe after dust removal.

[0109] In this embodiment, both the first limiting component and the second limiting component include an upper limit hook 45 and a lower limit hook 46. One end of the upper limit hook 45 in the first limiting component is fitted onto the first fixing ring 42, and the other end is connected to the top of the preheating channel 40.

[0110] One end of the lower limit hook 45 in the first limiting component is fitted onto the first fixing ring 42, and the other end is connected to the bottom of the preheating channel 40.

[0111] One end of the upper limit hook 45 in the second limiting component is fitted onto the first fixing ring 42, and the other end is connected to the top of the preheating channel 40.

[0112] One end of the lower limit hook 45 in the second limiting component is fitted onto the first fixing ring 42, and the other end is connected to the bottom of the preheating channel 40.

[0113] The purpose of this design is to fix the first and second fixing rings onto the preheating channel by setting upper and lower limit hooks.

[0114] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electric arc furnace continuous production system comprising an electric arc furnace body (60), a horizontal charging device, a scrap steel dedusting device and a charging preheating device, characterized in that, The electric arc furnace body (60) top inserts electrode stick (62), and electrode stick (62) one end is connected with power transmission line (64), and electric arc furnace body (60) one side is provided with electric arc furnace feed inlet (41), and is communicated with preheating device through electric arc furnace feed inlet (41), the electric arc furnace body (60) top is provided with auxiliary material adding mechanism and flue gas exhaust pipe (63), and electric arc furnace body (60) is provided with steelmaking cavity (61), and the lower part of steelmaking cavity (61) is provided with the blanking net (68), and the bottom of steelmaking cavity (61) is provided with the blanking pipe (69); The horizontal feeding device includes a conveying groove (10), both sides of the conveying groove (10) are provided with scrap steel storage platforms (12), one end of the conveying groove (10) is connected with a dust removal device, the other end of the conveying groove (10) is provided with a pushing mechanism, and the pushing mechanism can push the scrap steel (13) in the conveying groove (10) into the dust removal device, a damping mechanism is arranged between the conveying groove (10) and the scrap steel storage platforms (12), and a dispatching mechanism is arranged on the scrap steel storage platforms (12), and the dispatching mechanism can dispatch the scrap steel (13) on the scrap steel storage platforms (12) into the conveying groove (10); The scrap steel dust removal device includes a dust removal channel (20), one end of the dust removal channel (20) is communicated with the conveying groove (10), and the other end of the dust removal channel (20) is communicated with the buffer pipe (44), wherein the top of the dust removal channel (20) is provided with an exhaust mechanism, the bottom of the dust removal channel (20) is connected with an air inlet mechanism, and the airflow entering the dust removal channel (20) from the air inlet mechanism can be discharged from the exhaust mechanism; The feeding preheating device includes a preheating channel (40), one end of the preheating channel (40) is communicated with the buffer pipe (44), the other end of the preheating channel (40) is communicated with the electric arc furnace feed inlet (41), and a preheating cavity (58) is arranged in the preheating channel (40), a preheating air inlet mechanism and a preheating air outlet mechanism are arranged on the preheating channel (40), a preheating pipe is arranged in the interlayer of the preheating channel (40), along the conveying direction of the scrap steel in the preheating channel (40), the preheating air inlet mechanism is close to the electric arc furnace feed inlet (41), the preheating air inlet mechanism is communicated with the dust removal tail gas conveying pipe (47), and the preheating air outlet mechanism is close to the buffer pipe (44), and the preheating air outlet mechanism is communicated with the dust removal tail gas exhaust pipe (56).

2. An electric arc furnace continuous production system according to claim 1, characterized in that, The auxiliary material adding mechanism includes an auxiliary material batching tank (66) and an auxiliary material adding pipe (65), the auxiliary material batching tank (66) is communicated with a lime bin, a carbon ball bin and a magnesium ball bin, and the bottom discharge port of the auxiliary material batching tank (66) is communicated with the top of the electric arc furnace body (60) through the auxiliary material adding pipe (65).

3. An electric arc furnace continuous production system according to claim 1, characterized in that, The flue gas exhaust pipe (63) is communicated with the top of the electric arc furnace body (60) at one end and with the air inlet end of the bag type dust removal tank (71) at the other end, the air outlet end of the bag type dust removal tank (71) is communicated with the air conveying mechanism, the air conveying mechanism comprises an air conveying branch pipe (72), an air conveying main pipe (73) and a dust removal tail gas conveying pipe (47), the air conveying branch pipe (72) is communicated with the air conveying main pipe (73), the dust removal tail gas conveying pipe (47) is communicated with the air conveying main pipe (73) at one end and with the preheating device at the other end, and the dust removal tail gas conveying pipe (47) is located behind the air conveying branch pipe (72) along the gas flow direction in the air conveying main pipe (73).

4. An electric arc furnace continuous production system according to claim 1, characterized in that, The scrap steels (13) on the two scrap steel storage platforms (12) are located above the conveying grooves (10) on both sides, respectively, the damping mechanism comprises a first damping plate (3) and a second damping plate (4), the second damping plate (4) is arranged above the first damping plate (3), one end of the second damping plate (4) is connected with the scrap steel storage platform (12), and the bottom of the second damping plate (4) is connected with the first damping plate (3) through a connecting rod, and one end of the first damping plate (3) is connected with the top of the conveying groove (10).

5. An electric arc furnace continuous production system according to claim 4, characterized in that, The first damping plate (3) and the second damping plate (4) are both arranged in an inclined manner, and the inclination angle of the first damping plate (3) in the horizontal direction is smaller than that of the second damping plate (4) in the horizontal direction.

6. An electric arc furnace continuous production system according to claim 1, characterized in that, The air exhaust mechanism comprises an air exhaust pipe (21) and an air exhaust branch pipe (27), the air exhaust pipe (21) is arranged above the dust removal channel (20), one end of the air exhaust branch pipe (27) is communicated with the top of the dust removal channel (20), and the other end of the air exhaust branch pipe (27) is communicated with the air exhaust pipe (21).

7. An electric arc furnace continuous production system according to claim 6, characterized in that, The air exhaust mechanism comprises a plurality of air exhaust branch pipes (27), the plurality of air exhaust branch pipes (27) are arranged at the same interval, and the vertical projection of the air exhaust branch pipe (27) is located below the vertical projection of the air exhaust pipe (21).

8. An electric arc furnace continuous production system according to claim 1, characterized in that, The air inlet mechanism comprises a first air inlet mechanism and a second air inlet mechanism, and the first air inlet mechanism and the second air inlet mechanism are arranged on both sides of the dust removal channel (20), respectively, the first air inlet mechanism comprises a first air inlet fan (22), a first air inlet pipe (24) and a first air distribution structure (28), the first air distribution structure (28) is arranged in the dust removal channel (20) and located at the bottom of the dust removal channel (20), one end of the first air inlet pipe (24) is connected with the air outlet end of the first air inlet fan (22), and the other end of the first air inlet pipe (24) is connected with the first air distribution structure (28). The second air inlet mechanism comprises a second air inlet fan (23), a second air inlet pipe (25) and a second air distribution structure (29), the second air distribution structure (29) is arranged in the dust removal channel (20) and located at the bottom of the dust removal channel (20) opposite to the first air distribution structure (28), one end of the second air inlet pipe (25) is connected with the air outlet end of the second air inlet fan (23), and the other end of the second air inlet pipe (25) is connected with the second air distribution structure (29).

9. An electric arc furnace continuous production system according to claim 1, characterized in that, The preheating intake mechanism comprises a first fixed ring (42), an intake component and a first limiting component, the first fixed ring (42) is communicated with the tail gas conveying pipe (47) after dust removal, a gas flow channel is arranged in the first fixed ring (42), the gas flow channel is communicated with the intake component, the first fixed ring (42) is arranged on the outer periphery of the preheating channel (40), the intake component can preheat the preheating channel (40), the first limiting component connects the first fixed ring (42) and the preheating channel (40), the preheating exhaust mechanism comprises a second fixed ring (43), an exhaust component and a second limiting component, the second fixed ring (43) is communicated with the tail gas exhaust pipe (56) after dust removal, a gas flow channel is arranged in the second fixed ring (43), the gas flow channel is communicated with the exhaust component, the second fixed ring (43) is arranged on the outer periphery of the preheating channel (40), the exhaust component can guide the preheated gas out of the preheating channel (40), and the second limiting component connects the second fixed ring (43) and the preheating channel (40).

10. An electric arc furnace continuous production system according to claim 9, characterized in that, The intake component comprises a first intake pipe (48), a second intake pipe (49), a third intake pipe (50) and a fourth intake pipe (51), the exhaust component comprises a first exhaust pipe (52), a second exhaust pipe (53), a third exhaust pipe (54) and a fourth exhaust pipe (55), one end of the first intake pipe (48) is communicated with the internal gas flow channel of the first fixed ring (42), the other end is inserted into the preheating channel (40) from the top and is communicated with the first preheating pipe arranged in the interlayer on the top of the preheating channel (40), one end of the second intake pipe (49) is communicated with the internal gas flow channel of the first fixed ring (42), the other end is inserted into the preheating channel (40) from the side and is communicated with the second preheating pipe arranged in the interlayer on the side of the preheating channel (40), one end of the third intake pipe (50) is communicated with the internal gas flow channel of the first fixed ring (42), the other end is inserted into the preheating channel (40) from the side and is communicated with the third preheating pipe arranged in the interlayer on the side of the preheating channel (40), and the third preheating pipe and the second preheating pipe are oppositely arranged, one end of the fourth intake pipe (51) is communicated with the internal gas flow channel of the first fixed ring (42), the other end is inserted into the preheating channel (40) from the bottom and is communicated with the fourth preheating pipe arranged in the interlayer on the bottom of the preheating channel (40), The first gas outlet pipe (52) is communicated with the inner airflow passage of the second fixed ring (43) at one end and is inserted into the preheating passage (40) from the top and communicated with the first preheating pipe arranged in the interlayer of the top of the preheating passage (40), the second gas outlet pipe (53) is communicated with the inner airflow passage of the second fixed ring (43) at one end and is inserted into the preheating passage (40) from the side and communicated with the second preheating pipe arranged in the interlayer of the side of the preheating passage (40), the third gas outlet pipe (54) is communicated with the inner airflow passage of the second fixed ring (43) at one end and is inserted into the preheating passage (40) from the side and communicated with the third preheating pipe arranged in the interlayer of the side of the preheating passage (40), and the fourth gas outlet pipe (55) is communicated with the inner airflow passage of the second fixed ring (43) at one end and is inserted into the preheating passage (40) from the bottom and communicated with the fourth preheating pipe arranged in the interlayer of the bottom of the preheating passage (40).

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