Electromagnetic stirring device for electric arc furnace and stirring method thereof

Abstract

The present disclosure provides an electromagnetic stirring device for an electric arc furnace, which includes an electromagnetic stirrer, a rotating mechanism, and a cooling unit. The electromagnetic stirrer is arranged below the electric arc furnace, and the electromagnetic stirrer is arranged on the rotating mechanism; an electromagnetic inductor is provided inside the electromagnetic stirrer; the cooling unit includes a water-cooling component and an air-cooling component, the water-cooling component includes a water-cooling pipe leading to the electromagnetic inductor, and cold water for cooling the electromagnetic inductor flows in the water-cooling pipe; the air-cooling component includes at least one fan, the fan is connected to a blower through an air guide pipe, and the blower is arranged between the top of the electromagnetic stirrer and the bottom of the electric arc furnace; the electromagnetic stirrer, the rotating mechanism, and the cooling unit are respectively connected to an electronic control unit, and the electronic control unit uniformly controls the electromagnetic stirrer, the rotating mechanism, and the cooling unit.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electromagnetic metallurgical equipment, and in particular to an electromagnetic stirring device for an electric arc furnace and a stirring method thereof. Background Art

[0002] Electric arc furnace steelmaking is one of the primary methods used in steel mills to shorten steelmaking processes. It offers numerous advantages, including high thermal efficiency, operational flexibility, strong reducibility, a readily controllable high-temperature environment, simple equipment structure, and a relatively short process flow. Electromagnetic stirring at the bottom of the electric arc furnace effectively and contactlessly mixes the entire melt and accelerates the melting of alloying elements, including residual scrap solids. This system meets the needs of various electric furnace process steps, including scrap melting, heating, refining, slag reduction, slag removal, and slag tapping. This contactless stirring of the molten steel homogenizes the chemical composition and temperature of the melt after a single stirring cycle. Furthermore, stirring does not disrupt the surface slag, reducing slag buildup. Stirring during the melting process shortens melting time, improves production efficiency, and significantly reduces worker workload.

[0003] In the prior art, CN201080069100.X discloses a device and method for electromagnetic stirring in an electric arc furnace, which is achieved by setting two electromagnetic stirrers on the outer bottom surface of the electric arc furnace. The electromagnetic stirrer is used by a control unit to push the molten steel to flow and stir the molten steel. The device and method require the installation of two electromagnetic stirrers, which require synergy. At the same time, excessive stirring at the same position will cause excessive erosion of the lining of the electric arc furnace with molten steel, reducing the life of the lining. Generally, the stirrer is as close to the electric arc furnace as possible, and the stirring efficiency is high. However, the electric arc furnace is a high-power device with a large amount of heat generation. The temperature of the electric arc furnace is high, and the radiant heat is large, which is easily transmitted to the electromagnetic stirrer. This technology does not take into account issues such as excessive stirring, radiant heat of the electric arc furnace, temperature control, and electromagnetic stirrer shielding. Summary of the Invention

[0004] In response to the above technical problems in the related art, the present disclosure proposes an electromagnetic stirring device for an electric arc furnace, which can overcome the above deficiencies in the prior art.

[0005] To achieve the above technical objectives, the technical solution of the present disclosure is implemented as follows:

[0006] The first object of the present disclosure is to provide an electromagnetic stirring device for an electric arc furnace, comprising an electromagnetic stirrer, a rotating mechanism, and a cooling unit, wherein the electromagnetic stirrer is arranged below the electric arc furnace and is arranged on the rotating mechanism; an electromagnetic inductor is provided inside the electromagnetic stirrer and can generate a traveling wave magnetic field when energized;

[0007] The cooling unit includes a water-cooling component and an air-cooling component. The water-cooling component includes a water-cooling pipe leading to the electromagnetic inductor, and cold water for cooling the electromagnetic inductor flows in the water-cooling pipe; the air-cooling component includes at least one fan, and the fan is connected to a blower through an air guide pipe. The blower is arranged between the top of the electromagnetic stirrer 1 and the bottom of the electric arc furnace;

[0008] The electromagnetic stirrer, the rotating mechanism, and the cooling unit are respectively connected to an electronic control unit, and the electronic control unit controls the electromagnetic stirrer, the rotating mechanism, and the cooling unit in a unified manner;

[0009] The electronic control unit includes a power supply module, a control module and a monitoring module that cooperate with each other. The power supply module jointly controls whether the electromagnetic stirrer, rotating mechanism and cooling unit are powered on; the control module jointly controls the operation of the electromagnetic stirrer, rotating mechanism and cooling unit; the monitoring module is used to monitor the temperature of the electromagnetic stirrer, the cold water temperature, flow and pressure of the water-cooling component, and the cooling air flow rate of the air-cooling component.

[0010] During implementation, the monitoring module may include a temperature sensor located within the electromagnetic stirrer, a temperature sensor and flowmeter and water pressure gauge located within the water-cooling assembly, and a wind speed sensor located at the blower position for measuring the cooling air flow rate, thereby enabling monitoring of temperature, cooling air flow rate, and cooling air flow rate. The monitoring module may be implemented using existing technology, as long as it is capable of monitoring temperature, cold water flow rate, and cooling air flow rate. The electric arc furnace is a high-power device with a high heat output. The high temperature of the electric arc furnace generates a large amount of radiant heat, which is easily transferred to the electromagnetic stirrer. The compressed air ejected by the blower of the air-cooling assembly can cool the temperature between the electric arc furnace and the electromagnetic stirrer, reducing the radiant heat from the electric arc furnace transferred to the electromagnetic stirrer, thereby better protecting the electromagnetic stirrer.

[0011] Preferably, the electromagnetic stirrer is provided with a housing on its outer surface, wherein a shielding copper plate is built into the housing; a stirrer base is provided at the bottom of the electromagnetic stirrer, and the electromagnetic stirrer is connected to the rotating mechanism via the stirrer base. The electromagnetic stirrer can be implemented using existing technology or the preferred solution of this application.

[0012] Preferably, the water cooling assembly cools the electromagnetic inductor through the cold water in the water cooling pipe, thereby cooling the electromagnetic stirrer.

[0013] Preferably, the rotating mechanism includes a slewing bearing, a drive gear, an electromagnetic stirring mounting base, and a rotating mechanism base; the slewing bearing and the drive gear are meshingly connected, the bottom of the electromagnetic stirring mounting base is detachably connected to the top of the slewing bearing, and the bottom of the slewing bearing is rotatably connected to the top of the rotating mechanism base. The drive gear is connected to an external power device, such as an output shaft of a motor or other power device via a bearing.

[0014] Preferably, the rotating mechanism is connected to the stirrer base via the electromagnetic stirring mounting base.

[0015] Preferably, the electromagnetic inductor is a concentrated winding.

[0016] Preferably, the magnetic pole surface of the electromagnetic inductor faces the electric arc furnace, and an electromagnetic coil for generating a traveling wave magnetic field is provided inside the electromagnetic inductor.

[0017] Preferably, when the length of the electromagnetic inductor is ≤1.8 meters, the electromagnetic inductor adopts a two-phase inductor, and the corresponding two-phase current has a phase angle of 90°; when the length of the electromagnetic inductor is greater than 1.8 meters, the electromagnetic inductor adopts a three-phase inductor, and the corresponding three-phase current has a phase angle of 120°.

[0018] The second object of the present disclosure is to provide a stirring method for the electromagnetic stirring device for an electric arc furnace, which comprises the following steps:

[0019] S1: The electronic control unit is powered on and starts working;

[0020] S2: The electronic control unit first turns on the monitoring module and the cooling unit, and then turns on the power module and the control module. The control module initializes the rotation direction of the rotating mechanism to clockwise or counterclockwise.

[0021] S3: The power module transmits an excitation current to the electromagnetic stirrer, the control module controls the cooling unit to perform cooling, and the monitoring module monitors the electromagnetic stirrer and the cooling unit. The electromagnetic stirrer can generate a traveling wave magnetic field to push the molten steel in the electric arc furnace from the middle to both sides to form a reflux;

[0022] S4: After the power module is turned on for N minutes, the control module controls the rotating mechanism to rotate M degrees along the rotation direction, and the electromagnetic stirrer rotates along with the rotating mechanism to push the molten steel to move; wherein the value range of N is 5 to 30, and the value range of M is 5 to 45;

[0023] S5: Repeat S until the rotating mechanism completes a 360° rotation along the rotating direction, then reverses the rotating direction to the opposite direction and returns to S4;

[0024] S6: The electronic control unit is powered off, and the various structures of the electromagnetic stirring device are reset, and the work is finished.

[0025] Preferably, the specific working steps of S3 are:

[0026] S3.1: After the electromagnetic stirrer receives the excitation current, it first delays the generation of a traveling wave magnetic field, and the control module controls the cooling unit to start first, thereby starting the water cooling component and the air cooling component respectively;

[0027] S3.2: The water cooling assembly cools the electromagnetic inductor, and the air cooling assembly cools the air between the electromagnetic stirrer and the bottom shell of the electric arc furnace;

[0028] S3.3: Immediately after the cooling unit is started, the monitoring module starts to operate and monitors the temperature of the electromagnetic stirrer via a temperature sensor, the temperature or flow of the cold water of the water-cooling assembly via a flow meter or temperature sensor, and the cooling air flow rate of the air-cooling assembly via a wind speed sensor;

[0029] S3.4: The electromagnetic stirrer then starts to generate a traveling wave magnetic field, which pushes the molten steel in the electric arc furnace from the middle to both sides to form a reflux.

[0030] Preferably, when the temperature of the electromagnetic stirrer is monitored to be ≥80°C, the control module controls to increase the water pump speed of the water cooling assembly, increases the cold water flow in the water cooling pipe, thereby accelerating the cooling of the electromagnetic stirrer temperature; at the same time, the control module controls to increase the fan speed, increases the cooling air volume, and accelerates the heat dissipation of the air between the cooling electromagnetic stirrer and the arc furnace;

[0031] When the temperature sensor detects that the temperature is ≤30°C, the control module controls to reduce the water pump speed of the water cooling component and reduce the cold water flow in the water cooling pipe; at the same time, the control module controls to reduce the fan speed and reduce the cooling air volume;

[0032] Thus, the operating temperature of the electromagnetic stirrer is maintained between 30 and 80°C.

[0033] Preferably, in addition, when the monitoring module monitors that the temperature of the electromagnetic stirrer is higher than 80° C. for a long time, the monitoring module issues an alarm; when the wind speed sensor detects that the cooling air flow rate is abnormal, the monitoring module issues an alarm.

[0034] Preferably, the excitation current is a low-frequency alternating current.

[0035] Preferably, the excitation current is 0-2000A, and the frequency is 0-10Hz.

[0036] The beneficial effects of the present disclosure include: the electromagnetic stirrer provided herein, installed at the bottom of an electric arc furnace, generates a traveling magnetic field that propels the molten steel. A rotating mechanism rotates the electromagnetic stirrer, ensuring sufficient flow of the molten steel within the furnace, making the temperature and alloy composition more uniform and preventing scaling. Furthermore, the rotating mechanism enables the stirrer to stir at different positions, preventing excessive erosion of the furnace lining by the molten steel during stirring. Through the synergistic effects of a control unit, power supply unit, and air cooling unit, the present disclosure ensures the safe and stable operation of an electromagnetic stirring system for an electric arc furnace.

[0037] This invention uses an electromagnetic stirrer to generate a traveling magnetic field to propel molten steel, accelerating its erosion and melting with scrap steel. The electromagnetic stirrer is mounted on a rotating mechanism, enabling multi-mode stirring. This results in more uniform temperature and composition of the molten steel in the electric arc furnace, reducing scaling and excessive erosion of the furnace lining. The coordinated operation of the control unit, power supply unit, and air cooling assembly ensures the safe and stable operation of the electromagnetic stirring system for electric arc furnaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0039] Figure 1 2 is a schematic structural diagram of an electromagnetic stirring system for an electric arc furnace according to an embodiment of the present invention.

[0040] Figure 2 is a cross-sectional view of an electromagnetic stirrer according to an embodiment of the present invention.

[0041] Figure 3 2 is an exploded view of a rotating mechanism according to an embodiment of the present invention.

[0042] Figure 4 1 is a planar schematic diagram of the electromagnetic stirrer at different rotation angles according to an embodiment of the present invention.

[0043] Figure 5 Schematic diagram of different rotation angles of the electromagnetic stirrer according to an embodiment of the present invention.

[0044] Figure 6 This is a simulated cloud diagram of the magnetic induction intensity of the electromagnetic stirrer according to an embodiment of the present invention.

[0045] Figure 7 4 is a vector diagram of the magnetic induction intensity simulation of the electromagnetic stirrer according to an embodiment of the present invention.

[0046] In the figure: 1. Electromagnetic stirrer; 1-1. Housing; 1-2. Electromagnetic inductor; 1-2-1. Pole surface; 1-2-2. Electromagnetic coil; 1-3. Shielding copper plate; 1-4. Stirrer base; 2. Rotating mechanism; 2-1. Slewing bearing; 2-2. Driving gear; 2-3. Electromagnetic stirring mounting base; 2-4. Rotating mechanism base; 3. Electronic control unit; 4-1. Water cooling assembly; 4-1-1. Water cooling pipe; 4-2. Air cooling assembly; 4-2-1. Fan; 4-2-2. Air guide duct; 4-2-3. Blower; 5. Electric arc furnace.

[0047] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0048] like Figure 1-7 As shown, in order to facilitate understanding of the above technical solutions of the present disclosure, the above technical solutions of the present disclosure are described in detail below through specific usage methods.

[0049] The first object of the present disclosure is to provide an electromagnetic stirring device for an electric arc furnace, comprising an electromagnetic stirrer 1, a rotating mechanism 2, and a cooling unit, wherein the electromagnetic stirrer 1 is arranged below the electric arc furnace 5, and the electromagnetic stirrer 1 is arranged on the rotating mechanism 2;

[0050] The electromagnetic stirrer 1 is provided with an electromagnetic inductor 1-2 capable of generating a traveling wave magnetic field when powered;

[0051] The cooling unit includes a water-cooling component 4-1 and an air-cooling component 4-2. The water-cooling component 4-1 includes a water-cooling pipe 4-1-1 leading to the electromagnetic inductor 1-2. Cold water for cooling the electromagnetic inductor 1-2 flows through the water-cooling pipe 4-1-1. The air-cooling component 4-2 includes at least one fan 4-2-1. The fan 4-2-1 is connected to a blower 4-2-3 via an air duct 4-2-2. The blower 4-2-3 is arranged between the top of the electromagnetic stirrer 1 and the bottom of the electric arc furnace 5.

[0052] The electromagnetic stirrer 1, the rotating mechanism 2, and the cooling unit are respectively connected to the electronic control unit 3, and the electronic control unit 3 controls the electromagnetic stirrer 1, the rotating mechanism 2, and the cooling unit in a unified manner;

[0053] The electronic control unit 3 includes a power supply module, a control module and a monitoring module that cooperate with each other. The power supply module jointly controls whether the electromagnetic stirrer 1, the rotating mechanism 2, and the cooling unit are powered on; the control module jointly controls the operation of the electromagnetic stirrer 1, the rotating mechanism 2, and the cooling unit; the monitoring module is used to monitor the temperature of the electromagnetic stirrer 1, the cold water temperature, flow rate and pressure of the water-cooling component 4-1, and the cooling air flow rate of the air-cooling component 4-2.

[0054] During implementation, the monitoring module may include a temperature sensor located within the electromagnetic stirrer 1, a temperature sensor and flowmeter located within the water-cooling assembly 4-1, and a wind speed sensor located at the blower 4-2-3 for measuring the cooling air flow rate, thereby enabling monitoring of temperature, cooling air flow rate, and cooling air flow rate. The monitoring module may be implemented using existing technology, as long as it is capable of monitoring temperature, cold water flow rate, and cooling air flow rate. The electric arc furnace 5 is a high-power device with high heat generation, high temperature, and high radiant heat, which is easily transferred to the electromagnetic stirrer 1. The compressed air ejected by the blower 4-2-3 of the air-cooling assembly 4-2 can cool the temperature between the electric arc furnace 5 and the electromagnetic stirrer 1, reducing the radiant heat from the electric arc furnace 5 transferred to the electromagnetic stirrer 1, and better protecting the electromagnetic stirrer 1.

[0055] In a specific embodiment, the outer surface of the electromagnetic stirrer 1 is provided with a shell 1-1, and the shell 1-1 has a shielding copper plate 1-3 built in. The bottom of the electromagnetic stirrer 1 is provided with a stirrer base 1-4, and the electromagnetic stirrer 1 is connected to the rotating mechanism 2 through the stirrer base 1-4. The shielding copper plate 1-3 has two main functions, a shielding function and a magnetic focusing function; the shielding function is to reduce the diffusion of the magnetic field of the electromagnetic stirrer 1 to the outside, which can reduce the influence of the magnetic field on external equipment, such as sensors. The magnetic focusing function is to increase the magnetic field in the action area of ​​the electromagnetic stirrer 1, that is, the direction of the electromagnetic stirrer 1 toward the arc furnace 5. The electromagnetic stirrer 1 can be implemented using existing technology, and its appearance can be an inverted trapezoidal quadrilateral as viewed from the side of the present application, or it can be other shapes, depending on actual needs.

[0056] In a specific embodiment, the housing 1-1 can be determined based on specific circumstances, and preferably covers the circumferential surface and lower outer surface area of ​​the electromagnetic stirrer 1 excluding the stirrer base 1-4. As long as protection is achieved and the magnetic induction effect is not affected, existing technologies can be used to achieve this. For example, the housing 1-1 can cover the outer surface area of ​​the electromagnetic stirrer 1 excluding the top surface and the stirrer base 1-4.

[0057] In a specific embodiment, the water cooling assembly 4 - 1 cools the electromagnetic inductor 1 - 2 through the cold water in the water cooling pipe 4 - 1 - 1 , thereby cooling the electromagnetic stirrer 1 .

[0058] In one embodiment, the rotating mechanism 2 includes a slewing bearing 2-1, a drive gear 2-2, an electromagnetic stirring mounting base 2-3, and a rotating mechanism base 2-4. The slewing bearing 2-1 and the drive gear 2-2 are meshed and connected. The bottom of the electromagnetic stirring mounting base 2-3 is detachably connected to the top of the slewing bearing 2-1. The bottom of the slewing bearing 2-1 is rotatably connected to the top of the rotating mechanism base 2-4. The drive gear 2-2 is connected to an external power device, such as the output shaft of a motor or other power device via a bearing.

[0059] In a specific embodiment, the rotating mechanism 2 is connected to the stirrer base 1 - 4 through the electromagnetic stirring mounting base 2 - 3 .

[0060] In a specific embodiment, the electromagnetic inductor 1-2 is a concentrated winding, which can reduce magnetic flux leakage.

[0061] In one embodiment, the magnetic pole face 1-2-1 of the electromagnetic inductor 1-2 faces the electric arc furnace 5, and an electromagnetic coil 1-2-2 for generating a traveling wave magnetic field is disposed within the electromagnetic inductor 1-2. When the magnetic pole face 1-2-1 faces the electric arc furnace 5, the magnetic induction intensity is high, and the stirring efficiency and stirring effect are better.

[0062] In a specific embodiment, when the length of the electromagnetic inductor 1-2 is ≤1.8 meters, the electromagnetic inductor 1-2 adopts a two-phase inductor, and the corresponding phase angle of the two-phase current is 90°; when the length of the electromagnetic inductor 1-2 is greater than 1.8 meters, the electromagnetic inductor 1-2 adopts a three-phase inductor, and the corresponding phase angle of the three-phase current is 120°.

[0063] The second object of the present disclosure is to provide a stirring method for the electromagnetic stirring device for an electric arc furnace, which comprises the following steps:

[0064] S1: The electronic control unit 3 is powered on and starts working;

[0065] S2: The electronic control unit 3 first turns on the monitoring module and the cooling unit, and then turns on the power module and the control module. The control module initializes the rotation direction of the rotating mechanism 2 to clockwise or counterclockwise.

[0066] S3: The power supply module transmits an excitation current to the electromagnetic stirrer 1, the control module controls the cooling unit to perform cooling, and the monitoring module monitors the electromagnetic stirrer 1 and the cooling unit. The electromagnetic stirrer 1 can generate a traveling wave magnetic field to push the molten steel in the electric arc furnace 5 from the middle to both sides to form a reflux;

[0067] S4: After the power module is turned on for N minutes, the control module controls the rotating mechanism 2 to rotate M degrees along the rotation direction, and the electromagnetic stirrer 1 rotates together with the rotating mechanism 2 to push the molten steel to move; wherein the value range of N is 5 to 30, and the value range of M is 5 to 45;

[0068] S5: Repeat S4 until the rotating mechanism 2 completes a 360° rotation along the rotating direction, then reverses the rotating direction to the opposite direction and returns to S4;

[0069] S6: The electronic control unit 3 is powered off, and the various structures of the electromagnetic stirring device are reset, and the work is finished.

[0070] In a specific embodiment, the specific working steps of S3 are:

[0071] S3.1: After the electromagnetic stirrer 1 receives the excitation current, it first delays the generation of a traveling wave magnetic field. The control module controls the cooling unit to start first, and the water cooling component 4-1 and the air cooling component 4-2 are thereby started respectively;

[0072] S3.2: The water cooling assembly 4-1 cools the electromagnetic inductor 1-2, and the air cooling assembly 4-2 cools the air between the electromagnetic stirrer 1 and the bottom shell of the electric arc furnace 5;

[0073] S3.3: Immediately after the cooling unit is started, the monitoring module starts working and monitors the temperature of the electromagnetic stirrer 1 through a temperature sensor, monitors the temperature or flow of the cold water of the water-cooling assembly 4-1 through a flow meter or temperature sensor, and monitors the cooling air flow rate of the air-cooling assembly 4-2 through a wind speed sensor;

[0074] S3.4: The electromagnetic stirrer 1 then starts to generate a traveling wave magnetic field, which pushes the molten steel in the electric arc furnace 5 from the middle to both sides to form a reflux.

[0075] In a specific embodiment, when the temperature of the electromagnetic stirrer 1 is monitored to be ≥80°C, the control module controls to increase the water pump speed of the water cooling assembly 4-1, increases the cold water flow in the water cooling pipe 4-1-1, thereby accelerating the cooling of the temperature of the electromagnetic stirrer 1; at the same time, the control module controls to increase the speed of the fan 4-2-1, increases the cooling air volume, and accelerates the heat dissipation of the air between the cooling electromagnetic stirrer 1 and the arc furnace 5;

[0076] When the temperature sensor detects that the temperature is ≤30°C, the control module controls to reduce the water pump speed of the water cooling component 4-1 and reduce the cold water flow in the water cooling pipe 4-1-1; at the same time, the control module controls to reduce the speed of the fan 4-2-1 and reduce the cooling air volume;

[0077] Thus, the operating temperature of the electromagnetic stirrer 1 is maintained between 30 and 80°C.

[0078] In a specific embodiment, in addition, when the monitoring module monitors that the temperature of the electromagnetic stirrer 1 is higher than 80° C. for a long time, the monitoring module issues an alarm; when the wind speed sensor detects that the cooling air flow rate is abnormal, the monitoring module issues an alarm.

[0079] In a specific embodiment, the excitation current is a low-frequency alternating current.

[0080] In a specific embodiment, the excitation current is 0-2000A, and the frequency is 0-10Hz.

[0081] Principle of the method: Figure 4-7 As shown, the stirring method, especially S4 and S5, causes the rotating mechanism 2 to intermittently rotate from 0° to 360° and then rotate back to 0° from 360°, that is, to continuously rotate back and forth in a clockwise and counterclockwise direction. Each rotation cycle ends after multiple intermittent rotations accumulate to a full circle, and then the rotation direction is reversed to execute the next cycle. The continuous rotation of the rotating mechanism 2 and the rotation of the electromagnetic stirrer 1 along with it cause the traveling wave magnetic field to continuously change and drive the molten steel to move. The traveling wave magnetic field drives the molten steel to form a circulation flow field in the electric arc furnace 5. When the electronic control system 3 rotates the rotating mechanism 2, the electromagnetic stirrer 1 drives the molten steel to form multiple modes of circulation in the electric arc furnace 5. The molten steel has multiple modes of flow, the temperature of the molten steel is more uniform, the composition of the molten steel is more uniform, the scaling of the furnace lining is reduced, and the erosion of the lining of the electric arc furnace 5 due to excessive stirring when the electromagnetic stirrer 1 is fixed in one position can be prevented.

[0082] In summary, the unique design of the present invention, including the electromagnetic stirrer provided herein, installed at the bottom of the electric arc furnace, generates a traveling magnetic field that propels the molten steel to flow. A rotating mechanism rotates the electromagnetic stirrer, allowing the molten steel to flow fully within the electric arc furnace, making the temperature and alloy composition within the furnace more uniform and preventing scaling. Furthermore, the rotating mechanism enables the stirrer to stir at different locations, preventing excessive erosion of the furnace lining material by the molten steel during stirring. Through the synergistic effects of the control unit, power supply unit, and air cooling unit, the present invention ensures the safe and stable use of the electromagnetic stirring system for electric arc furnaces.

[0083] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. An electromagnetic stirring device for an electric arc furnace, characterized in that: The invention comprises an electromagnetic stirrer (1), a rotating mechanism (2), and a cooling unit, wherein the electromagnetic stirrer (1) is arranged below an electric arc furnace (5), the electromagnetic stirrer (1) is arranged on the rotating mechanism (2), and an electromagnetic inductor (1-2) capable of generating a traveling wave magnetic field when energized is provided inside the electromagnetic stirrer (1); The cooling unit comprises a water-cooling component (4-1) and an air-cooling component (4-2); the water-cooling component (4-1) comprises a water-cooling pipe (4-1-1) leading to the electromagnetic inductor (1-2), and cold water for cooling the electromagnetic inductor (1-2) flows in the water-cooling pipe (4-1-1); the air-cooling component (4-2) comprises at least one fan (4-2-1), the fan (4-2-1) is connected to a blower (4-2-3) via an air guide pipe (4-2-2), and the blower (4-2-3) is arranged between the top of the electromagnetic stirrer (1) and the bottom of the electric arc furnace (5); The electromagnetic stirrer (1), the rotating mechanism (2), and the cooling unit are respectively connected to an electric control unit (3), and the electric control unit (3) controls the electromagnetic stirrer (1), the rotating mechanism (2), and the cooling unit in a unified and coordinated manner; The electric control unit (3) includes a power module, a control module and a monitoring module that cooperate with each other. The power module jointly controls whether the electromagnetic stirrer (1), the rotating mechanism (2) and the cooling unit are powered on; the control module jointly controls the operation of the electromagnetic stirrer (1), the rotating mechanism (2) and the cooling unit; and the monitoring module is used to monitor the temperature of the electromagnetic stirrer (1), the cold water temperature, flow rate and pressure of the water cooling component (4-1), and the cooling air flow rate of the air cooling component (4-2). The electromagnetic stirrer (1) is provided with a shell (1-1) on its outer surface, and a shielding copper plate (1-3) is built into the shell (1-1); a stirrer base (1-4) is provided at the bottom of the electromagnetic stirrer (1), and the electromagnetic stirrer (1) is connected to the rotating mechanism (2) via the stirrer base (1-4); The rotating mechanism (2) comprises a slewing bearing (2-1), a driving gear (2-2), an electromagnetic stirring mounting seat (2-3), and a rotating mechanism base (2-4); the slewing bearing (2-1) and the driving gear (2-2) are meshed and connected, the bottom of the electromagnetic stirring mounting seat (2-3) is detachably connected to the top of the slewing bearing (2-1), and the bottom of the slewing bearing (2-1) is rotatably connected to the top of the rotating mechanism base (2-4); the rotating mechanism (2) is connected to the stirrer base (1-4) via the electromagnetic stirring mounting seat (2-3).

2. The electromagnetic stirring device according to claim 1, characterized in that The electromagnetic inductor (1-2) is a concentrated winding.

3. The electromagnetic stirring device according to claim 1, characterized in that The magnetic pole surface (1-2-1) of the electromagnetic inductor (1-2) faces the electric arc furnace (5), and an electromagnetic coil (1-2-2) for generating a traveling wave magnetic field is provided inside the electromagnetic inductor (1-2).

4. The electromagnetic stirring device according to claim 1, characterized in that When the length of the electromagnetic inductor (1-2) is less than or equal to 1.8 meters, the electromagnetic inductor (1-2) adopts a two-phase inductor, and the corresponding phase angle of the two-phase current is 90°; when the length of the electromagnetic inductor (1-2) is greater than 1.8 meters, the electromagnetic inductor (1-2) adopts a three-phase inductor, and the corresponding phase angle of the three-phase current is 120°.

5. A stirring method for an electromagnetic stirring device for an electric arc furnace according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: The electronic control unit (3) is powered on and starts working; S2: the electronic control unit (3) first turns on the monitoring module and the cooling unit, and then turns on the power module and the control module, and the control module initializes the rotation direction of the rotating mechanism (2) to clockwise or counterclockwise; S3: the power supply module transmits an excitation current to the electromagnetic stirrer (1), the control module controls the cooling unit to perform a cooling operation, the monitoring module monitors the electromagnetic stirrer (1) and the cooling unit, and the electromagnetic stirrer (1) generates a traveling wave magnetic field to push the molten steel in the electric arc furnace (5) from the middle to both sides to form a reflux; S4: After the power module is turned on for N minutes, the control module controls the rotating mechanism (2) to rotate M degrees along the rotation direction, and the electromagnetic stirrer (1) rotates along with the rotating mechanism (2) to push the molten steel to move; wherein, the value range of N is 5 to 30, and the value range of M is 5 to 45; S5: Repeat S4 until the rotating mechanism (2) completes a 360° rotation along the rotating direction, then reverses the rotating direction to the opposite direction and returns to S4; S6: The electric control unit (3) is powered off, and the various structures of the electromagnetic stirring device are reset, and the operation is terminated.

6. The stirring method according to claim 5, characterized in that: The specific working steps of S3 are: S3.1: After the electromagnetic stirrer (1) receives the excitation current, it first delays the generation of a traveling wave magnetic field, and the control module controls the cooling unit to start first, thereby starting the water cooling component (4-1) and the air cooling component (4-2) respectively; S3.2: the water cooling component (4-1) cools the electromagnetic inductor (1-2), and the air cooling component (4-2) cools the air between the electromagnetic stirrer (1) and the bottom shell of the electric arc furnace (5); S3.3: Immediately after the cooling unit is started, the monitoring module starts to work and monitors the temperature of the electromagnetic stirrer (1) through a temperature sensor, monitors the cold water temperature or flow rate of the water cooling component (4-1) through a flow meter or temperature sensor, and monitors the cooling air flow rate of the air cooling component (4-2) through a wind speed sensor; S3.4: The electromagnetic stirrer (1) then starts to generate a traveling wave magnetic field, which pushes the molten steel in the electric arc furnace (5) from the middle to both sides to form a reflux.

7. The stirring method according to claim 5, characterized in that: When the temperature of the electromagnetic stirrer (1) is monitored to be ≥80°C, the control module controls to increase the water pump speed of the water cooling component (4-1), increases the flow rate of cold water in the water cooling pipe (4-1-1), thereby accelerating the cooling of the temperature of the electromagnetic stirrer (1); at the same time, the control module controls to increase the speed of the fan (4-2-1), increases the cooling air volume, and accelerates the heat dissipation of the air between the cooling electromagnetic stirrer (1) and the arc furnace (5); When the temperature sensor detects that the temperature is ≤30°C, the control module controls to reduce the water pump speed of the water cooling component (4-1), thereby reducing the flow of cold water in the water cooling pipe (4-1-1); at the same time, the control module controls to reduce the speed of the fan (4-2-1), thereby reducing the cooling air volume; Thus, the working temperature of the electromagnetic stirrer (1) is maintained between 30 and 80°C; In addition, when the monitoring module detects that the temperature of the electromagnetic stirrer (1) is continuously higher than 80° C. for a long time, the monitoring module issues an alarm; when the wind speed sensor detects that the cooling air flow rate is abnormal, the monitoring module issues an alarm.

8. The stirring method according to claim 5, characterized in that: The excitation current is a low-frequency alternating current; the excitation current is 0-2000A, and the frequency is 0-10Hz.

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