A composite electromagnetic stereoscopic partition flow control device and a continuous casting machine

Abstract

The application provides a composite electromagnetic stereoscopic partitioned flow control device and a continuous casting machine, and belongs to the technical field of metallurgical continuous casting. The composite electromagnetic stereoscopic partitioned flow control device comprises at least four induction winding structures. The induction winding structures are arranged outside a crystallizer. The induction winding structures are used for stereoscopic partitioned control of composite electromagnetic force acting on the crystallizer. By arranging at least four induction winding structures outside the crystallizer, stereoscopic partitioned control of composite electromagnetic force on the meniscus and the wide surface area is realized, and the stability of the continuous casting process and the quality of the cast slab are significantly improved.

Description

Technical Field

[0001] This application belongs to the field of metallurgical continuous casting technology, specifically relating to a composite electromagnetic three-dimensional zoned flow control device and a continuous casting machine. Background Technology

[0002] In continuous casting production, with the continuous improvement of continuous casting machine equipment and the continuous optimization of production processes, its production capacity has been significantly enhanced, and the billet drawing speed has also increased accordingly. However, while high-speed drawing improves production efficiency, it also brings a series of process control challenges and quality risks. Increased drawing speed results in the molten metal jet injected into the crystallizer having greater kinetic energy. When it impacts the narrow face of the crystallizer, it forms a stronger upward backflow. This violent backflow causes instability at the steel-slag interface, significantly increasing the fluctuation amplitude and making the protective slag layer easily damaged, thus inducing surface slag entrapment and damaging the surface quality of the billet. Furthermore, the enhanced impact of the high-speed metal jet on the narrow face not only causes flow field turbulence but also interferes with the stable formation of the primary billet shell in that area. Uneven heat exchange and fluid shearing cause fluctuations in the billet shell growth thickness and an increase in local weak points, significantly increasing the probability of adhesion and run-out, threatening the smooth operation of continuous production. On the other hand, the downward backflow vortex formed after impacting the narrow face extends towards the lower part of the molten pool, and its penetration depth further increases with increasing drawing speed. The strong downward flow carries non-metallic inclusions (such as deoxidation products and secondary oxidation particles) in the casting stream to deeper regions of the liquidus cavity, significantly shortening the time window for their allowable flotation and separation, making it difficult to effectively remove these inclusions. Some small inclusions remain inside the billet, not only affecting the cleanliness of the billet but also potentially forming defects such as surface inclusions, subcutaneous bubbles, and even internal cracks, severely restricting the product quality and performance stability of high-end steel grades.

[0003] To meet the precise control requirements of molten steel flow patterns in high-quality alloy continuous casting, various composite electromagnetic control technologies integrating steady magnetic fields and stirring magnetic fields have been developed and applied to slab crystallizer process control in recent years. For example, Chinese patent CN102413963A proposes a composite electromagnetic flow control method. This method applies an alternating magnetic field to the upper part of the crystallizer to achieve electromagnetic stirring, enhancing the flow and heat transfer of the molten metal in that area. Simultaneously, a steady magnetic field is applied to the lower part of the crystallizer for electromagnetic braking, effectively suppressing the intensity of backflow and reducing the impact depth. This zoned collaborative control strategy addresses the dual needs of upper activation and lower suppression, better meeting the requirements of precise flow field control in high-quality slab production. However, in the structural design of this device, the upper and lower magnetic yokes are interconnected, requiring the upper electromagnetic stirring and lower electromagnetic braking to operate synchronously. This makes it difficult to independently and flexibly adjust the molten steel flow state according to the actual pouring process. This rigid coupling limits the adaptability of electromagnetic parameters to complex working conditions, not only reducing control accuracy but also potentially adversely affecting slab quality due to improper magnetic field matching. Chinese patent CN108500228A discloses a method for controlling the flow field in a slab continuous casting crystallizer. This method employs upper electromagnetic stirring, combined with a regional steady magnetic field for lower electromagnetic braking. Compared to existing technologies, its core difference lies in the independence of the upper stirring magnetic field and the lower braking magnetic field, each powered by a separate power supply system. This allows for independent and flexible adjustment of the magnetic field strength based on the actual flow state of the molten metal within the crystallizer, significantly improving the adaptability and precision of process control. However, this method still has certain limitations. On one hand, the strip magnetic poles used in the upper part can only act on a limited horizontal area, resulting in insufficient coverage in the height direction of the crystallizer. This makes it difficult for the upper and lower molten metals to achieve sufficient mixing, thus affecting the uniformity of solute and temperature distribution within the slab and limiting its effectiveness in improving internal quality problems such as center segregation and shrinkage cavities. On the other hand, the lower regional steady magnetic field, limited by its own structure, has a relatively localized area of ​​action, making it difficult to comprehensively and effectively suppress the overall flow field in the lower part of the crystallizer. Turbulence and impact behavior in some areas may still not be fully controlled, hindering further improvement in the overall flow control effect. Chinese patent CN114932206A discloses an independent and controllable composite magnetic field device and method for controlling the flow of molten metal in a crystallizer. This method places a regional electromagnetic brake near the nozzle and an independently controllable electromagnetic stirring device near the meniscus. However, because the electromagnetic stirrer near the meniscus accelerates the molten steel and causes it to move in a circular motion, the velocity of the molten steel near the center of the meniscus increases significantly, impacting the nozzle and causing violent fluctuations in the meniscus surface, severely affecting the quality of the continuously cast billet and wasting resources.

[0004] In summary, existing technologies struggle to achieve three-dimensional, zoned control of the molten metal within the crystallizer under high casting speeds. Therefore, there is an urgent need to develop a composite electromagnetic three-dimensional zoned flow control device and a continuous casting machine. Summary of the Invention

[0005] Therefore, the purpose of this application is to provide a composite electromagnetic three-dimensional zoned flow control device and a continuous casting machine, which at least solves one of the technical problems mentioned in the background art.

[0006] To address the aforementioned issues, the first aspect of this application provides a composite electromagnetic three-dimensional zoned current control device, comprising at least four induction winding structures; the induction winding structures are disposed on the outside of the crystallizer; the induction winding structures are used for three-dimensional zoned control of the composite electromagnetic force acting on the crystallizer.

[0007] Optionally, the induction winding structure includes an alternating magnetic field induction winding structure, a primary static magnetic field induction winding structure, a secondary static magnetic field induction winding structure, and a tertiary static magnetic field induction winding structure; the alternating magnetic field induction winding structure and the primary static magnetic field induction winding structure are arranged at the meniscus of the crystallizer, the secondary static magnetic field induction winding structure is arranged above the immersion nozzle of the crystallizer, and the tertiary static magnetic field induction winding structure is arranged below the immersion nozzle of the crystallizer.

[0008] Optionally, each of the two wide faces of the crystallizer is provided with at least two sets of alternating magnetic field induction winding structures, and each set of alternating magnetic field induction winding structures is provided with a primary static magnetic field induction winding structure on the side away from the wide face of the crystallizer; each of the two wide faces of the crystallizer is provided with at least one secondary static magnetic field induction winding structure and one tertiary static magnetic field induction winding structure.

[0009] Optionally, the two sets of alternating magnetic field induction winding structures arranged on the same wide surface are symmetrically arranged with the immersion nozzle of the crystallizer as the center of symmetry; the two primary static magnetic field induction winding structures arranged on the same wide surface are symmetrically arranged with the immersion nozzle of the crystallizer as the center of symmetry.

[0010] Optionally, the spacing between two primary static magnetic field induction winding structures arranged on the same wide surface is 500mm~1000mm.

[0011] Optionally, the number of alternating magnetic field induction winding structures in each group is an even multiple of three.

[0012] Optionally, the spacing between the alternating magnetic field induction winding structure and the primary static magnetic field induction winding structure is 100mm~150mm.

[0013] Optionally, the alternating magnetic field induction winding structure, the first-stage static magnetic field induction winding structure, the second-stage static magnetic field induction winding structure, and the third-stage static magnetic field induction winding structure are respectively connected to the corresponding PLC power supply, so that the alternating magnetic field induction winding structure, the first-stage static magnetic field induction winding structure, the second-stage static magnetic field induction winding structure, and the third-stage static magnetic field induction winding structure are each independently controlled by the corresponding PLC power supply.

[0014] Optionally, the alternating magnetic field induction winding structure is supplied with three-phase electricity at a frequency of 0.1Hz to 10Hz and a current of 1A to 1200A; the first-stage static magnetic field induction winding structure is supplied with high-voltage direct current at a current of 1A to 1000A; and both the second-stage and third-stage static magnetic field induction winding structures are supplied with high-voltage direct current at a current of 1A to 1200A.

[0015] The second aspect of this application provides a continuous casting machine, including the composite electromagnetic three-dimensional zoned flow control device described in any one of the above.

[0016] By employing the above technical solution, the present invention has at least the following beneficial effects:

[0017] This application provides a composite electromagnetic three-dimensional zoned flow control device and a continuous casting machine. By arranging at least four induction winding structures on the outside of the crystallizer, composite electromagnetic three-dimensional zoned control of the meniscus and wide area is realized, which significantly improves the stability of the continuous casting process and the quality of the cast billet. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the composite electromagnetic three-dimensional zoned flow control device arranged in the wide face direction of the crystallizer according to an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the composite electromagnetic three-dimensional zoned flow control device arranged in the narrow face direction of the crystallizer according to an embodiment of this application.

[0020] Figure 3 This is a schematic diagram showing the arrangement of the alternating magnetic field induction winding structure and the primary static magnetic field induction winding structure on the meniscus of the crystallizer according to an embodiment of this application.

[0021] Figure 4 This is a diagram illustrating the effect of the composite electromagnetic three-dimensional partitioned current control device in the wide face of the crystallizer using electromagnetic three-dimensional partitioned current control, as described in this application embodiment.

[0022] Figure 5 This is a diagram illustrating the effect of the composite electromagnetic three-dimensional zoned current control device in the meniscus of the crystallizer, according to an embodiment of this application.

[0023] Figure 6This is a diagram showing the magnetic field distribution of the primary alternating magnetic field at the center line of the meniscus of the crystallizer, according to an embodiment of this application.

[0024] Figure 7 This is a magnetic field distribution diagram of the primary static magnetic field at the center line of the meniscus of the crystallizer, representing an embodiment of this application.

[0025] The reference numerals in the attached figures are as follows:

[0026] 1. Immersion nozzle; 2. Crystallizer; 3. Alternating magnetic field induction winding structure; 4. First-stage static magnetic field induction winding structure; 5. Second-stage static magnetic field induction winding structure; 6. Third-stage static magnetic field induction winding structure; 7. Alternating magnetic field core; 8. Alternating magnetic field coil; 9. Static magnetic field core; 10. Static magnetic field coil; 11. Magnetic yoke; 12. First-stage stirring acceleration zone; 13. First-stage central braking deceleration zone; 14. Second-stage upper circulating braking deceleration zone; 15. Third-stage lower circulating braking deceleration zone. Detailed Implementation

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] See also Figure 1 As shown, according to an embodiment of this application, a composite electromagnetic three-dimensional zoned current control device is provided, including at least four induction winding structures; the induction winding structures are disposed on the outer side of the wide surface of the crystallizer 2; the induction winding structures are used to perform three-dimensional zoned control of the composite electromagnetic force acting on the crystallizer 2.

[0032] By arranging at least four induction winding structures on the outside of the crystallizer 2, composite electromagnetic three-dimensional zoned control of the meniscus and wide area is realized, which significantly improves the stability of the continuous casting process and the quality of the billet.

[0033] The composite electromagnetic three-dimensional zone control device also includes a magnetic yoke 11, and the induction winding structure is connected to the magnetic yoke 11 to support and fix the induction winding structure.

[0034] Specifically, the magnetic yoke 11 is made of a non-magnetic material.

[0035] In another embodiment, such as Figure 2 As shown, the induction winding structure includes an alternating magnetic field induction winding structure 3, a primary static magnetic field induction winding structure 4, a secondary static magnetic field induction winding structure 5, and a tertiary static magnetic field induction winding structure 6. The alternating magnetic field induction winding structure 3 and the primary static magnetic field induction winding structure 4 are arranged at the meniscus of the crystallizer 2, the secondary static magnetic field induction winding structure 5 is arranged above the immersion nozzle 1 of the crystallizer 2, and the tertiary static magnetic field induction winding structure 6 is arranged below the immersion nozzle 1 of the crystallizer 2.

[0036] By arranging alternating magnetic field induction winding structure 3, primary static magnetic field induction winding structure 4, secondary static magnetic field induction winding structure 5, and tertiary static magnetic field induction winding structure 6 on the outer side of the wide face of the crystallizer 2, three-dimensional zoned control of composite electromagnetics is achieved. Alternating magnetic field induction winding structure 3 is used to flush the solidification front, reduce the adhesion of inclusions and bubbles on the surface of the primary billet shell, and avoid surface slag inclusions and subcutaneous bubbles. Primary static magnetic field induction winding structure 4 stabilizes the meniscus, prevents the protective slag from being entrained, and reduces the probability of surface cracks in the billet. Secondary static magnetic field induction winding structure 5 and tertiary static magnetic field induction winding structure 6 suppress the upper and lower circulation, respectively, causing inclusions and bubbles to float to the surface and reducing their probability of entering the liquid phase cavity. Closed circulation drives inclusions to gather towards the meniscus, making them easier to be adsorbed by the protective slag and reducing the retention of non-metallic inclusions inside the billet.

[0037] The alternating magnetic field induction winding structure 3 and the primary static magnetic field induction winding structure 4 are arranged at the meniscus of the crystallizer 2, where the meniscus refers to the cross-section at the top of the crystallizer 2 perpendicular to the wide face. The alternating magnetic field induction winding structure 3 is arranged closer to the crystallizer 2 than the primary static magnetic field induction winding structure 4. The closer proximity of the alternating magnetic field induction winding structure 3 to the crystallizer 2 allows its agitation force to act directly on the molten steel near the meniscus, quickly removing inclusions and bubbles from the leading edge of the solidified billet shell and promoting their floating to the slag layer for removal, thereby improving the surface quality of the cast billet. Simultaneously, the alternating magnetic field induction winding structure 3 adjusts the flow field state in real time, preventing the agitation force from weakening due to excessive distance, thus avoiding ineffective intervention in the wide face flow field.

[0038] The alternating magnetic field induction winding structure 3 includes an alternating magnetic field core 7 and an alternating magnetic field coil 8. One end of the alternating magnetic field core 7 is fixed on the magnetic yoke 11, and the other end faces the crystallizer 2. The alternating magnetic field coil 8 is sleeved on the alternating magnetic field core 7.

[0039] The primary static magnetic field induction winding structure 4, the secondary static magnetic field induction winding structure 5, and the tertiary static magnetic field induction winding structure 6 have the same specific structure, only different sizes. They include a static magnetic field coil 10 and a static magnetic field core 9. The static magnetic field core 9 is fixed on the magnetic yoke 11, and the static magnetic field coil 10 is sleeved on the static magnetic field core 9.

[0040] Specifically, the static magnetic field core 9 of the primary static magnetic field induction winding structure 4 faces the alternating magnetic field induction winding structure 3; while the static magnetic field core 9 of the secondary static magnetic field induction winding structure 5 and the tertiary static magnetic field induction winding structure 6 faces the crystallizer 2.

[0041] In another embodiment, such as Figure 3 As shown, each of the two wide faces of the crystallizer 2 is provided with at least two sets of alternating magnetic field induction winding structures 3, and each set of alternating magnetic field induction winding structures 3 is provided with a primary static magnetic field induction winding structure 4 on the side away from the wide face of the crystallizer 2; each of the two wide faces of the crystallizer 2 is provided with at least one secondary static magnetic field induction winding structure 5 and a tertiary static magnetic field induction winding structure 6.

[0042] In this embodiment, at least two sets of alternating magnetic field induction winding structures 3 are provided on each of the two wide surfaces of the crystallizer 2. That is, the number of alternating magnetic field induction winding structures 3 is not just one, covering at least part of the wide surface of the crystallizer 2. Each set of alternating magnetic field induction winding structures 3 is provided with a primary static magnetic field induction winding structure 4 on the side away from the wide surface of the crystallizer 2. That is, in this embodiment, two primary static magnetic field induction winding structures 4 are arranged on each wide surface.

[0043] Specifically, the number of each set of alternating magnetic field induction winding structures 3 is an even multiple of three. In this embodiment, the number of each set of alternating magnetic field induction winding structures 3 is six. The specific number can be adjusted according to the width of the crystallizer 2. A spacing is provided between adjacent alternating magnetic field induction winding structures 3.

[0044] In this embodiment, each of the two wide surfaces of the crystallizer 2 is provided with at least one secondary static magnetic field induction winding structure 5 and a tertiary static magnetic field induction winding structure 6. That is, in this embodiment, the secondary static magnetic field induction winding structure 5 and the tertiary static magnetic field induction winding structure 6 fully cover the wide surface of the crystallizer 2.

[0045] In another embodiment, two sets of alternating magnetic field induction winding structures 3 arranged on the same wide face are symmetrically arranged with the immersion nozzle 1 of the crystallizer 2 as the center of symmetry; two primary static magnetic field induction winding structures 4 arranged on the same wide face are symmetrically arranged with the immersion nozzle 1 of the crystallizer 2 as the center of symmetry. The symmetrical arrangement of the two sets of alternating magnetic field induction winding structures 3 generates dynamic magnetic fields of consistent intensity and coordinated direction on both sides of the wide face, ensuring uniform flow velocity of the molten metal along the wide face and the narrow faces on both sides of the crystallizer 2, forming a stable closed loop. This avoids insufficient stirring of the molten steel on one side and retention of inclusions due to magnetic field deviation, or excessive stirring on one side causing local eddies. The symmetrical arrangement of the primary static magnetic field induction winding structures 4 can form a uniform and stable braking magnetic field at the center of the meniscus and on both sides of the wide face, preventing increased local liquid surface fluctuations due to insufficient braking on one side, thereby avoiding the risk of slag entrapment.

[0046] In another embodiment, the spacing between the two primary static magnetic field induction winding structures 4 arranged on the same wide surface is 500mm~1000mm.

[0047] The spacing between the two primary static magnetic field induction winding structures 4 arranged on the same wide surface is 500mm~1000mm. Specifically, the spacing between the static magnetic field cores 9 of the two primary static magnetic field induction winding structures 4 is 500mm~1000mm. This spacing design is exactly matched with the wide surface size of the slab crystallizer 2, so that the two primary static magnetic field induction winding structures 4 can cover the return channels on both sides of the wide surface respectively, forming a double-sided braking zone, avoiding flow field turbulence caused by excessive local flow velocity.

[0048] If the spacing is too small (e.g., <500mm), the magnetic field will be concentrated in the center of the wide surface of crystallizer 2, resulting in the backflow on both sides not being suppressed, which may still impact the meniscus and cause slag entrainment; if the spacing is too large (e.g., >1000mm), there will be a magnetic field superposition blind zone, which cannot effectively dissipate the kinetic energy of the flow stream.

[0049] In another embodiment, the spacing between the alternating magnetic field induction winding structure 3 and the primary static magnetic field induction winding structure 4 is 100mm~150mm.

[0050] The spacing between the alternating magnetic field induction winding structure 3 and the primary static magnetic field induction winding structure 4 is 100mm~150mm. In other words, the spacing between the alternating magnetic field core 7 of the alternating magnetic field induction winding structure 3 and the static magnetic field core 9 of the primary static magnetic field induction winding structure 4 is 100mm~150mm.

[0051] The alternating magnetic field induction winding structure 3 generates a periodically changing magnetic field force through high-frequency current, driving the molten metal in the crystallizer 2 to form a circulating current; the primary static magnetic field induction winding structure 4 generates a constant Lorentz force through a steady magnetic field, suppressing the high-speed flow.

[0052] If the spacing between the alternating magnetic field induction winding structure 3 and the primary static magnetic field induction winding structure 4 is too close, the high-frequency fluctuations of the alternating magnetic field will induce eddy currents in the static magnetic field, causing the steady characteristics of the static magnetic field to interfere with the periodic force field distribution of the alternating magnetic field, thus reducing the stirring efficiency.

[0053] In another embodiment, the alternating magnetic field induction winding structure 3, the primary static magnetic field induction winding structure 4, the secondary static magnetic field induction winding structure 5, and the tertiary static magnetic field induction winding structure 6 are each connected to their respective PLC power supplies, so that each of these structures is independently controlled by its corresponding PLC power supply. By using independent PLC power supply control, the magnetic field strength in a specific area can be adjusted individually according to the dynamic changes in the flow field during continuous casting, improving adaptability to complex working conditions.

[0054] The alternating magnetic field induction winding structure 3, the primary static magnetic field induction winding structure 4, the secondary static magnetic field induction winding structure 5, and the tertiary static magnetic field induction winding structure 6 are each connected to their respective PLC power supplies. That is, the alternating magnetic field induction winding structure 3 is controlled by an independent PLC power supply to generate the alternating magnetic field; the primary static magnetic field induction winding structure 4 is controlled by an independent PLC power supply to generate the primary static magnetic field; the secondary static magnetic field induction winding structure 5 is controlled by an independent PLC power supply to generate the secondary static magnetic field; and the tertiary static magnetic field induction winding structure 6 is controlled by an independent PLC power supply to generate the tertiary static magnetic field. The alternating magnetic field forms a closed loop in the wide area of ​​the crystallizer 2, driving the molten metal to move along the wide surface to the narrow sides, scouring the leading edge of the solidified billet shell and carrying away inclusions and bubbles. Simultaneously, the primary static magnetic field forms a braking and deceleration zone at the center of the meniscus, suppressing excessive flow of the molten metal, avoiding uneven flow velocity and slag entrapment. Furthermore, the arrangement of the alternating magnetic field and the primary static magnetic field reduces magnetic field interference, balancing stirring activation and liquid surface stability. The secondary static magnetic field fully covers the wide surface of crystallizer 2, acting on the upper circulation region above the outlet of submerged entry nozzle 1. This reduces the circulation velocity, preventing velocity unevenness caused by its superposition with the circulation excited by the alternating magnetic field, stabilizing the steel-slag interface, and reducing damage to the surface quality of the cast billet caused by surface slag entrainment. The tertiary static magnetic field fully covers the wide surface of crystallizer 2, acting on the lower circulation region below the outlet of submerged entry nozzle 1. This weakens the downward impact depth of the molten metal, reduces the penetration depth of inclusions and bubbles, and decreases the probability of them being captured by the solidified billet shell, thereby fundamentally improving the internal cleanliness of the cast billet.

[0055] In another embodiment, the alternating magnetic field induction winding structure 3 is supplied with three-phase electricity at a frequency of 0.1Hz to 10Hz and a current of 1A to 1200A; the first-stage static magnetic field induction winding structure 4 is supplied with high-voltage direct current at a current of 1A to 1000A; and both the second-stage static magnetic field induction winding structure 5 and the third-stage static magnetic field induction winding structure 6 are supplied with high-voltage direct current at a current of 1A to 1200A.

[0056] A second aspect of this application provides a continuous casting machine including a composite electromagnetic three-dimensional zoned flow control device as described above. By separately regulating the flow behavior of molten metal in different regions of the crystallizer 2, composite electromagnetic three-dimensional zoned control of the meniscus and wide-area regions is achieved, significantly improving the stability of the continuous casting process and the quality of the cast billet.

[0057] Example 1

[0058] The specific operations during the production process are as follows:

[0059] Turn on the alternating magnetic field induction winding structure 3, and set the electromagnetic stirring frequency to 1.2 Hz and the current to 150 A. For example... Figure 6As shown, this setup can generate four alternating magnetic field peaks along the center line of the meniscus, significantly enhancing the stirring capability compared to traditional electromagnetic stirring devices.

[0060] like Figure 4 As shown, the alternating magnetic field induction winding structure 3 induces electromagnetic force in the molten steel, driving the molten steel to move along the wide surface to both narrow surfaces, forming a horizontal closed circulation, i.e., the first-stage stirring acceleration zone 12. This flow can effectively flush the leading edge of the solidified billet shell, carrying away inclusions and air bubbles, promoting their rise to the meniscus, and reducing billet shell defects. Figure 5 As shown, the primary static magnetic field induction winding structure 4 forms a primary central braking and deceleration zone 13 in the central region of the meniscus, effectively suppressing excessively high molten steel flow velocity in this region and preventing slag entrapment and surface fluctuations. Figure 7 The diagram shows the magnetic field distribution of the first-order static magnetic field along the center line of the meniscus of the crystallizer.

[0061] Simultaneously, the secondary static magnetic field induction winding structure 5 and the tertiary static magnetic field induction winding structure 6 are activated. The secondary static magnetic field induction winding structure 5 acts on the upper circulation area formed by the molten steel at the outlet of the submerged entry nozzle 1, forming a secondary upper circulation braking and deceleration zone 14, which reduces the flow velocity of the upper circulation and prevents it from superimposing with the primary stirring circulation, resulting in uneven flow velocity. The tertiary static magnetic field induction winding structure 6 is used to generate a tertiary lower circulation braking and deceleration zone 15, which weakens the downward impact depth of the molten steel, reduces the impact depth of inclusions and bubbles, facilitates their floating, reduces the probability of being captured by the solidified billet shell, and ultimately improves the quality of the continuously cast billet.

[0062] By separately regulating the flow behavior of molten steel in different regions, composite electromagnetic three-dimensional zoned control of the meniscus and wide area was achieved, significantly improving the stability of the continuous casting process and the quality of the cast billet.

[0063] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0064] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A composite electromagnetic stereoscopic partitioned flow control device, characterized in that, The application relates to a complex electromagnetic three-dimensional partition control device, which comprises at least four induction winding structures; the induction winding structures are arranged outside a crystallizer (2); and the induction winding structures are used for three-dimensional partition control of a complex electromagnetic force acting on the crystallizer (2). The induction winding structures comprise alternating magnetic field induction winding structures (3), first-order static magnetic field induction winding structures (4), second-order static magnetic field induction winding structures (5) and third-order static magnetic field induction winding structures (6); the alternating magnetic field induction winding structures (3) and the first-order static magnetic field induction winding structures (4) are arranged at menisci of the crystallizer (2), the second-order static magnetic field induction winding structures (5) are arranged above immersion nozzles (1) of the crystallizer (2), and the third-order static magnetic field induction winding structures (6) are arranged below the immersion nozzles (1) of the crystallizer (2). Each wide surface of the crystallizer (2) is provided with at least two groups of the alternating magnetic field induction winding structures (3), and each group of the alternating magnetic field induction winding structures (3) is provided with the first-order static magnetic field induction winding structures (4) away from one side of the wide surface of the crystallizer (2); and each wide surface of the crystallizer (2) is provided with at least one second-order static magnetic field induction winding structure (5) and at least one third-order static magnetic field induction winding structure (6).

2. The composite electromagnetic stereoscopic partitioned flow control device according to claim 1, wherein, The two groups of the alternating magnetic field induction winding structures (3) arranged on the same wide surface are symmetrically arranged with the immersion nozzles (1) of the crystallizer (2) as the symmetric center; and the two first-order static magnetic field induction winding structures (4) arranged on the same wide surface are symmetrically arranged with the immersion nozzles (1) of the crystallizer (2) as the symmetric center.

3. The composite electromagnetic stereoscopic partitioned flow control device of claim 2, wherein, The interval between the two first-order static magnetic field induction winding structures (4) arranged on the same wide surface is 500mm-1000mm.

4. The composite electromagnetic stereoscopic partitioned flow control device of claim 2, wherein, The number of each group of the alternating magnetic field induction winding structures (3) is a multiple of three.

5. The composite electromagnetic stereoscopic partitioned flow control device of claim 2, wherein, The interval between the alternating magnetic field induction winding structures (3) and the first-order static magnetic field induction winding structures (4) is 100mm-150mm.

6. The composite electromagnetic stereoscopic partitioned flow control device of claim 2, wherein, The alternating magnetic field induction winding structures (3), the first-order static magnetic field induction winding structures (4), the second-order static magnetic field induction winding structures (5) and the third-order static magnetic field induction winding structures (6) are respectively connected with corresponding PLC power sources, so that the alternating magnetic field induction winding structures (3), the first-order static magnetic field induction winding structures (4), the second-order static magnetic field induction winding structures (5) and the third-order static magnetic field induction winding structures (6) are independently controlled by the corresponding PLC power sources.

7. The composite electromagnetic stereoscopic zonal flow control device according to claim 6, wherein, The alternating magnetic field induction winding structures (3) are connected with three-phase power, the frequency is 0.1Hz-10Hz, and the current is 1A-1200A; the first-order static magnetic field induction winding structures (4) are connected with high-voltage direct current, the current is 1A-1000A; and the second-order static magnetic field induction winding structures (5) and the third-order static magnetic field induction winding structures (6) are both connected with high-voltage direct current, the current is 1A-1200A.

8. A continuous caster characterized by, The application further discloses a complex electromagnetic three-dimensional partition control device. The application further discloses a complex electromagnetic three-dimensional partition control device.

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