CN115194107B - Multi-stage independent adjustable composite magnetic field device and method for controlling metal liquid flow - Google Patents
Multi-stage independent adjustable composite magnetic field device and method for controlling metal liquid flow Download PDFInfo
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Abstract
The invention belongs to the technical field of continuous casting, and particularly relates to a multi-stage independently adjustable composite magnetic field device and method for controlling molten metal to flow. The multi-stage independently adjustable composite magnetic field device can meet the requirement of metal liquid flow control in the area between the surface of the molten metal and the jet impact point of the narrow surface of the crystallizer in the height direction of the crystallizer, and can reduce the influence of technological parameter changes such as the blank drawing speed, the jet angle of the molten metal, the depth of a submerged nozzle and the like on the metal liquid flow control effect. Comprises three parts: a vertical electromagnetic stirring device, a horizontal electromagnetic stirring device and a jet type electromagnetic braking device; the three parts independently adjust the current intensity according to different casting conditions, and the flow of the molten metal in the slab continuous casting crystallizer is controlled in a partitioning way.
Description
Technical Field
The invention belongs to the technical field of continuous casting, and particularly relates to a multi-stage independently adjustable composite magnetic field device and method for controlling molten metal to flow.
Background
The crystallizer is used as a reactor of the final link in the continuous casting production process, and the internal molten metal flow state of the crystallizer directly influences the final quality of a casting blank. However, as the productivity of continuous casting machines increases, the withdrawal speed increases, and the molten metal flows into the mold through the submerged entry nozzle and then impacts the mold at a high speed in the direction of the narrow surface of the mold. Because of the increase of the blank pulling speed, the turbulent flow of the molten metal flowing out of the water gap is severe, so that the fluctuation of meniscus is aggravated, the molten metal flowing in the crystallizer is irregular, and the molten metal flowing back in the crystallizer and the flowing out of the water gap are caused to drift. In addition, the molten metal flows from the water gap under the high turbulence state, and the solidified shell formed near the narrow surface of the crystallizer is thinned and penetrated, so that the negative effects of uneven thickness distribution of the solidified shell, subcutaneous inclusion of a continuous casting blank, surface defects of a casting blank and the like are caused.
In order to solve the problems, a technical staff can form an electromagnetic field in the crystallizer by additionally arranging electromagnetic braking devices or electromagnetic stirring devices on two sides of the wide surface of the continuous casting crystallizer, and electromagnetic force generated by the electromagnetic field can inhibit or strengthen the flow of molten metal, so that the flow state of the molten metal in the crystallizer is improved, surface slag rolling is prevented, and surface slag melting is promoted.
In recent years, a plurality of electromagnetic braking devices are sequentially appeared in China, for example, chinese patent No. 200810011104.7 discloses a vertical electromagnetic braking device, and by arranging two pairs of vertical strip-shaped magnetic poles in a wide area near the narrow surface of a crystallizer, a stable magnetic field generated by the vertical strip-shaped magnetic poles can cover a water gap outflow impact area and a meniscus near area, so that the impact of water gap outflow molten steel on the narrow surface of the crystallizer is inhibited, the reflux impact strength is reduced, the free liquid level flow of the crystallizer is stabilized, and the formation probability of defects such as slag inclusion and the like is reduced. However, when the width of the crystallizer is large, the coverage width of the steady magnetic field generated by the vertical bar-shaped magnetic poles of the electromagnetic braking device in the width direction of the crystallizer is limited, so that the magnetic field effect at the central area of the width of the crystallizer is weakened, the impact depth of the returned molten steel in the central area of the crystallizer can not be effectively controlled, and the floating removal of foreign matters, bubbles and the like out of phase matters is not facilitated.
The Chinese patent 201610580291.5 also discloses a vertical electromagnetic braking device, which is characterized in that on the basis of a full-width one-section electromagnetic braking device, two pairs of vertical strip-shaped magnetic poles are added in a wide area near the narrow surface of a crystallizer, the vertical strip-shaped magnetic poles are connected with horizontal magnetic poles in an embedded manner, and a vertical steady magnetic field generated by the vertical electromagnetic braking device can cover a jet impact area, a meniscus area and a reflux area on the crystallizer by virtue of an exciting coil and a power supply control system of the full-width one-section electromagnetic braking device so as to overcome the defect that the area and the full-width one-section electromagnetic braking device are insufficient in braking the reflux area on the crystallizer. Meanwhile, the horizontal steady magnetic field generated by the horizontal magnetic pole is close to the electromagnetic braking effect of the full-width one-section electromagnetic braking device and the full-width two-section electromagnetic braking device, so that the flow of molten steel in a return region under the crystallizer can be effectively controlled. However, the connection mode between the vertical bar-shaped magnetic poles and the horizontal magnetic poles of the electromagnetic braking device belongs to embedded connection, the magnetic field intensity generated between the vertical bar-shaped magnetic poles is limited by the magnetic field intensity of the horizontal magnetic poles, and when the magnetic field intensity generated by the horizontal magnetic poles is weaker, the magnetic field intensity generated between the vertical bar-shaped magnetic poles is remarkably attenuated along the height direction of the crystallizer, so that the braking effect of the vertical bar-shaped magnetic poles is not beneficial to improvement.
The Chinese patent 201910032306.8 discloses an independently adjustable combined electromagnetic braking device, which is characterized in that two pairs of vertical strip-shaped magnetic poles and a pair of horizontal magnetic poles are arranged on two sides of the wide surface of a crystallizer, the horizontal magnetic poles are independently configured by horizontal exciting coils, the vertical strip-shaped magnetic poles are independently configured by vertical exciting coils, the horizontal magnetic poles and the vertical strip-shaped magnetic poles are not connected, the magnetic field intensity generated between the vertical strip-shaped magnetic poles is not limited by the magnetic field intensity of the horizontal magnetic poles, and the current intensity can be independently adjusted according to the actual flowing condition of molten metal in the crystallizer. However, the horizontal magnetic pole of the electromagnetic braking device cannot be freely adjusted in the height direction of the crystallizer, so that the coverage area of a steady magnetic field generated by the horizontal magnetic pole in the height direction of the crystallizer is limited, and when technological parameters such as the blank drawing speed, the outflow angle of a submerged nozzle, the impact depth and the like are changed in the continuous casting production process, the horizontal magnetic pole and the technological parameters cannot be kept in a good matching state, and the braking effect of the horizontal magnetic pole can be obviously reduced.
Subsequently, an electromagnetic device under the combined action of a direct-current magnetic field and an alternating-current magnetic field sequentially appears in China, for example, chinese patent No. 201080019323.5 discloses a composite electromagnetic device, an electromagnetic stirring device and a full-width electromagnetic braking device are respectively arranged in wide areas of a crystallizer on the upper side and the lower side of a submerged nozzle, the composite electromagnetic device can realize zoned control of metal liquid flowing in different areas in the crystallizer under the combined action of the upper electromagnetic stirring device and the lower full-width electromagnetic braking device, the alternating-current magnetic field generated by the upper electromagnetic stirring device can strengthen the metal liquid flowing in the upper area of the crystallizer, the activity of the metal liquid level is kept, and the direct-current magnetic field generated by the lower full-width electromagnetic braking device can reduce the penetration depth of the metal liquid into a molten pool on the lower part of the crystallizer and keep the floating rate of heterogeneous substances such as impurities, bubbles and the like. However, the electromagnetic stirring devices arranged on the upper side and the lower side of the immersed nozzle are connected with the full-width electromagnetic braking device through the magnetic yoke, and the alternating-current magnetic field generated by the electromagnetic stirring devices and the direct-current magnetic field generated by the full-width electromagnetic braking device are mutually interfered, so that the flow control effect of the composite magnetic field at the joint of the magnetic yoke can be remarkably reduced.
The Chinese patent with the patent number of 201710107017.0 also discloses a composite electromagnetic device, which can partition and control the metal liquid flow in different areas of a crystallizer under the combined action of an electromagnetic stirring device and an area type electromagnetic braking device through a strip traveling wave magnetic field generated by an upper electromagnetic stirrer and a direct-current steady magnetic field generated by a lower area type electromagnetic brake. The upper electromagnetic stirring device and the lower end region electromagnetic braking device of the composite electromagnetic device are respectively provided with independent power supply systems, and the electromagnetic intensity of each electromagnetic device can be independently controlled according to the actual flowing condition of molten metal in the crystallizer. However, the strip traveling wave magnetic field generated by the upper electromagnetic stirring device and the direct-current steady magnetic field generated by the lower area type electromagnetic braking device are limited in the coverage area of the crystallizer in the height direction, so that the metal liquid control flow effect in the upper and lower reflux areas and the jet impact area of the crystallizer can be reduced, insufficient mixing of solute and temperature in the casting blank is caused, and the improvement of the center quality of the casting blank is not facilitated.
Disclosure of Invention
The invention provides a multi-section independently adjustable composite magnetic field device and a method for controlling metal liquid flow, which aim at the defects of the prior art, and solve the problems that the prior electromagnetic device has, in particular to the problems that the regional magnetic poles of the regional electromagnetic braking device cannot effectively control the metal liquid flow in a lower backflow region in a crystallizer, the horizontal strip magnetic poles of the full-width one-section type and full-width two-section type electromagnetic braking devices cannot be freely adjusted in the height direction of the crystallizer, the surface flow speed of the metal liquid is too low due to the horizontal strip magnetic poles at the upper end of the full-width two-section type electromagnetic braking device, the metal liquid flow braking effect of the vertical strip magnetic poles which are independently arranged on the vertical electromagnetic braking device is weaker on the central region of the crystallizer, and the metal liquid flow braking effect of the electromagnetic stirring device and the regional electromagnetic braking device which are separately arranged on the upper backflow region and the lower backflow region of the crystallizer.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the multi-section independently adjustable composite magnetic field device for controlling the flow of molten metal comprises three parts: a vertical electromagnetic stirring device, a horizontal electromagnetic stirring device and a jet type electromagnetic braking device; the three parts independently adjust the current intensity according to different casting conditions, and the flow of the molten metal in the slab continuous casting crystallizer is controlled in a partitioning way.
Further, the vertical electromagnetic stirring device comprises a vertical stirring magnetic pole, a stirring iron core and a stirring coil, wherein the stirring coil is sleeved outside the stirring iron core, the stirring magnetic pole is arranged at the outer end part of the stirring iron core, and the vertical stirring magnetic pole, the stirring iron core and the stirring coil form an integrated structure; two of the two groups are combined into a group, symmetrically arranged on the wide surface or the narrow surface of the crystallizer; the traveling wave magnetic field generated by the vertical electromagnetic stirring device can drive the jet impact area to the molten metal in the meniscus area to do relative motion (wherein the jet impact area is an area where the molten metal jet flows out from the side hole of the immersed nozzle, the meniscus area is an area where bending is generated after the molten metal at the upper end of the crystallizer contacts with the wall surface of the crystallizer, and the upper reflux area is an area where upward reflux is generated after the molten metal jet flowing out from the side hole of the immersed nozzle impacts to the narrow side wall surface of the crystallizer); when the vertical electromagnetic stirring device is arranged on the wide surface of the crystallizer, three stirring iron cores are arranged on the inner side of each vertical stirring magnetic pole; when the vertical electromagnetic stirring device is arranged on the narrow surface of the crystallizer, six stirring iron cores are arranged on the inner side of each vertical stirring magnetic pole.
Further, the horizontal electromagnetic stirring device comprises a horizontal stirring magnetic pole, a stirring iron core and a stirring coil, wherein the stirring coil is sleeved outside the stirring iron core, the stirring magnetic pole is arranged at the outer end part of the stirring iron core, and the horizontal stirring magnetic pole, the stirring iron core and the stirring coil form an integrated structure; three stirring iron cores are arranged on the inner side of each horizontal stirring magnetic pole, and each stirring iron core is provided with a stirring coil; the horizontal electromagnetic stirring devices are arranged on the wide surface of the crystallizer and on two sides of molten metal in a pair by pair mode; the traveling wave magnetic field generated by the horizontal electromagnetic stirring device on the two sides of the wide surface of the crystallizer can drive the molten metal in the magnetic field area to do relative horizontal movement.
Further, the jet-type electromagnetic braking device comprises an integrated structure formed by rectangular magnetic poles, magnetic yokes and exciting coils, and the jet-type electromagnetic braking devices are arranged on two sides of a molten metal flowing area of a wide surface of the crystallizer and an immersed nozzle in a symmetrical mode; the jet type electromagnetic braking device adopts a stable constant direct current magnetic field form, and the jet type electromagnetic braking device is excited at two sides of the wide surface of the crystallizer to generate a stable constant direct current magnetic field perpendicular to the wide surface of the slab crystallizer so as to directly drive molten metal in a jet flow flowing area at an outlet of the submerged nozzle to perform relative motion; the rectangular magnetic poles and the magnetic yokes correspond to each other, exciting coils are arranged on the outer sides of the rectangular magnetic poles, and the outer surfaces of the exciting coils are in clearance fit with the inner surfaces of the magnetic yokes and the outer surfaces of the crystallizers.
Further, the upper surface of the vertical stirring magnetic pole of the vertical electromagnetic stirring device is 5-150 mm higher than the surface height of the molten metal, the magnetic pole thickness of the vertical stirring magnetic pole along the width direction of the crystallizer is 50-400 mm, the magnetic pole thickness of the vertical stirring magnetic pole along the height direction of the crystallizer is 150-1000 mm, the electromagnetic stirring frequency of the vertical stirring magnetic pole is 0.01-10 Hz, and the alternating current power supply of the stirring coil is 0.01-6000A;
when the vertical electromagnetic stirring device is positioned on the wide surface of the crystallizer, the vertical stirring magnetic pole can freely rotate in the height direction of the crystallizer, the rotation angle is between-60 degrees and 60 degrees, the distance L1 between the outer surface of the vertical stirring magnetic pole and the narrow surface of the crystallizer is 0-200 mm, and the distance L2 between the inner surfaces of the vertical stirring magnetic poles positioned on the same side of the wide surface of the crystallizer is 500-1500 mm.
When the vertical electromagnetic stirring device is positioned on the narrow surface of the crystallizer, the distance between the inner side surface of the stirring iron core of the vertical electromagnetic stirring device and the narrow surface of the crystallizer is 0-200 mm; the ratio of the magnetic pole thickness of the vertical stirring magnetic pole along the height direction of the crystallizer to the minimum distance between the surface of the molten metal and the upper surface of the rectangular magnetic pole of the jet-type electromagnetic braking device is more than 0.5, and the minimum distance between the lower surface of the vertical stirring magnetic pole and the upper surface of the rectangular magnetic pole is more than 50mm.
Further, the upper surface of the horizontal stirring magnetic pole of the horizontal electromagnetic stirring device is 5-150 mm higher than the surface of the molten metal, the magnetic pole thickness of the horizontal stirring magnetic pole along the width direction of the crystallizer is 50-500 mm, the magnetic pole thickness of the horizontal stirring magnetic pole along the height direction of the crystallizer is 50-500 mm, the distance L3 between the outer surface of the horizontal stirring magnetic pole and the narrow surface of the crystallizer is 150-400 mm, the electromagnetic stirring frequency of the horizontal stirring magnetic pole is 0.01-10 Hz, and the alternating current power supply of the stirring coil is 0.01-6000A.
Furthermore, the rectangular magnetic pole of the jet-type electromagnetic braking device can freely rotate in the width direction of the crystallizer, the rotation angle is between-60 degrees and 60 degrees, the minimum distance between the upper surface of the rectangular magnetic pole and the lower surface of the bottom of the submerged nozzle is 50-300 mm, the magnetic pole thickness of the rectangular magnetic pole along the height direction of the crystallizer is 10-1000 mm, the magnetic pole thickness of the rectangular magnetic pole along the width direction of the crystallizer is 50-400 mm, and the magnetic induction intensity of a steady magnetic field between the rectangular magnetic poles is 0.01-3T.
Further, the vertical electromagnetic stirring device can freely select the combination arrangement position of the horizontal electromagnetic stirring device and the jet-type electromagnetic braking device in the width direction or the height direction of the crystallizer.
Further, at high pulling speeds, the operation of the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet electromagnetic braking device decelerates the flow of the metal liquid which is controlled by the operation of the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet electromagnetic braking device; at low pull rates, the operation modes of the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device are opposite to those of the high pull rates, so that the flow rates of the metal liquid controlled by the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device are improved.
A multi-stage independent adjustable composite magnetic field method for controlling the flow of molten metal comprises the following steps:
in the continuous casting process, molten metal enters a crystallizer through a submerged nozzle, and the molten metal flowing out of an outlet of the submerged nozzle is impacted to a narrow surface of the crystallizer to form an upper reflux and a lower reflux;
Compared with the prior art, the invention has the beneficial effects.
1. The invention relates to a multi-section independent adjustable composite magnetic field device, which consists of a vertical electromagnetic stirring device, a horizontal electromagnetic stirring device and a jet-type electromagnetic braking device, wherein the electromagnetic devices are not connected with each other, are independent from each other and are powered by each other, and the electromagnetic stirring frequency and the current intensity of each system can be independently adjusted according to different casting conditions.
2. The multi-stage independently adjustable composite magnetic field device can strengthen the flexible regulation and control of the composite electromagnetic device, wherein a vertical traveling wave magnetic field generated by the vertical electromagnetic stirring device can cover three key areas of a meniscus area, a jet impact area and a reflux area on a crystallizer, a horizontal traveling wave magnetic field generated by the horizontal electromagnetic stirring device can cover the surface of metal liquid and an inlet area of a submerged nozzle, and a steady direct current magnetic field generated by the jet electromagnetic braking device can cover an outlet jet flow area of the submerged nozzle and a lower reflux area of the crystallizer, so that the zonal control of the metal liquid flow in the crystallizer is realized.
3. The multi-stage independently adjustable composite magnetic field device can meet the requirement of metal liquid flow control in the area between the surface of the molten metal and the jet impact point of the narrow surface of the crystallizer in the height direction of the crystallizer, and can reduce the influence of technological parameter changes such as the blank drawing speed, the jet angle of the molten metal, the depth of a submerged nozzle and the like on the metal liquid flow control effect.
4. The multi-stage independently adjustable composite magnetic field device can flexibly adjust the form, the position and the arrangement angle of the vertical electromagnetic stirring device and the jet-type electromagnetic braking device according to the flowing condition of molten metal at the outlet of the immersed nozzle so as to ensure that the flow control function of the multi-stage independently adjustable composite magnetic field device on the molten metal in the crystallizer can be more effectively exerted.
5. The vertical travelling wave magnetic field and the steady direct current magnetic field generated by the excitation of the multi-stage independent adjustable composite magnetic field device can improve the situation that the outlet jet flow of the submerged nozzle deflects to the two sides of the wide surface of the crystallizer, and the submerged nozzle is blocked or deflected.
6. The multi-section independently adjustable composite magnetic field device is suitable for continuous casting pulling speeds of different slabs, and a horizontal electromagnetic stirring device, a jet-type electromagnetic braking device and a vertical electromagnetic stirring device which are arranged in the width direction of a crystallizer are mutually matched for use. Under the high-pulling-speed process condition, the current intensity of the vertical stirring magnetic pole is increased to control the flow of the molten metal at the side meniscus of the crystallizer which is easy to induce slag coiling on the surface of the molten metal, and under the low-pulling-speed process condition, the current intensity of the horizontal stirring magnetic pole and the rectangular magnetic pole is properly weakened to ensure that the flow on the surface of the molten metal can keep a certain flow speed and heat exchange capacity, so that the capability of absorbing inclusion by the protecting slag is improved, and a good electromagnetic braking comprehensive effect is obtained.
7. The multi-section independently adjustable composite magnetic field device can avoid the mutual interference of a low-frequency alternating magnetic field generated by a vertical electromagnetic stirring device and a horizontal electromagnetic stirring device and a steady direct current magnetic field generated by a jet-type electromagnetic braking device, so as to be beneficial to the working stability of the multi-section independently adjustable composite magnetic field device.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
FIG. 1 is a three-dimensional schematic diagram of a multi-stage independently adjustable composite magnetic field device with a vertical electromagnetic stirring device positioned in the vertical direction of the wide surface of a crystallizer and a jet-type electromagnetic braking device positioned in the angular direction of-25 degrees of the wide surface of the crystallizer.
FIG. 2 is a three-dimensional schematic diagram of a multi-stage independently adjustable composite magnetic field device with a vertical electromagnetic stirring device positioned in the vertical direction of the narrow surface of a crystallizer and a jet-type electromagnetic braking device positioned in the wide surface of the crystallizer in the angle direction of-25 degrees.
FIG. 3 is a schematic view showing the arrangement of magnetic poles of a multi-stage independently adjustable composite magnetic field device of the vertical electromagnetic stirring device in the vertical direction of the wide surface of a crystallizer.
Fig. 4 is a schematic diagram of the arrangement of magnetic poles of the multi-stage independently adjustable composite magnetic field device of the vertical electromagnetic stirring device in the vertical direction of the narrow surface of the crystallizer.
FIG. 5 is a graph showing the magnetic field distribution of the thickness center plane of the mold along the height direction of the mold when the current 800A is applied to the horizontal electromagnetic stirring device, the stirring frequency is 5Hz, the current 500A is applied to the vertical electromagnetic stirring device, the stirring frequency is 5Hz, and the current 300A is applied to the jet type electromagnetic braking device under the multi-stage independently adjustable composite magnetic field device of FIG. 1.
FIG. 6 is a Lorentz force distribution diagram of a horizontal section of the horizontal electromagnetic stirring device in the width direction of the crystallizer, wherein the horizontal electromagnetic stirring device is applied with current 600A, the stirring frequency is 5Hz, the vertical electromagnetic stirring device is applied with current 500A, the stirring frequency is 5Hz, and the jet type electromagnetic braking device is applied with current 300A, which is lower than the 65mm position of the surface of the molten metal in the multi-stage independently adjustable composite magnetic field device in FIG. 1.
In the figure, the device comprises a 1-immersed nozzle, a 2-crystallizer, a 3-molten metal surface, a 4-vertical stirring magnetic pole, a 5-horizontal stirring magnetic pole, a 6-stirring iron core, a 7-stirring coil, an 8-rectangular magnetic pole and a 9-exciting coil.
Detailed Description
The multistage independent adjustable composite magnetic field device is characterized in that a vertical electromagnetic stirring device is arranged in the height direction of the crystallizer, and a horizontal electromagnetic stirring device and a jet-type electromagnetic braking device are arranged in the width direction of the crystallizer, so that a vertical traveling wave alternating current magnetic field, a horizontal traveling wave alternating current magnetic field and a steady direct current magnetic field generated by the vertical traveling wave alternating current magnetic field and the steady direct current magnetic field can cover four key areas of a meniscus area, a jet impact area, an upper backflow area and a lower backflow area of the crystallizer, and the zoned control of the metal liquid flow in the crystallizer is realized. The multi-section independently adjustable composite magnetic field device is less influenced by the change of electromagnetic parameters and process parameters, wherein the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet-type electromagnetic braking device are respectively and independently powered, and the current intensity of each system can be independently adjusted according to different casting conditions. The vertical traveling wave alternating current magnetic field generated by the vertical electromagnetic stirring device can flexibly control the impact of the upward backflow metal liquid on the meniscus near the narrow surface of the crystallizer, and the horizontal traveling wave alternating current magnetic field generated by the horizontal electromagnetic stirring device can keep the activity of the meniscus and the slag layer attached to the metal liquid surface, so that slag solidification is avoided to form a slag ring when the flow speed of the metal liquid on the liquid surface of the crystallizer is too low. The steady direct current magnetic field generated by the jet electromagnetic braking device can reduce the penetration depth of the lower reflux molten metal to a crystallizer molten pool while preferentially inhibiting the impact of the metal jet at the outlet of the water gap on the narrow surface of the crystallizer, and avoid the increase of the floating difficulty of non-metallic inclusion, bubbles and other heterogeneous substances entrained by the molten metal in the central area of the crystallizer when the flow speed of the lower reflux molten metal is too high.
As shown in fig. 1-6, specific embodiments: a multi-stage independently adjustable composite magnetic field device and method for controlling the flow of molten metal in a crystallizer 2 adopts a vertical electromagnetic stirring device, a horizontal electromagnetic stirring device and a jet-type electromagnetic braking device to control the flow of molten metal in a slab continuous casting crystallizer in a partitioning way. The vertical stirring pole 4, the stirring core 6 and the stirring coil 7 constitute a vertical electromagnetic stirring device which is arranged in a reflow region, a jet impact region and a meniscus region on both sides of the wide or narrow face of the crystallizer 2. The horizontal stirring magnetic pole 5, the stirring iron core 6 and the stirring coil 7 form a horizontal electromagnetic stirring device which is arranged in the area of the molten metal surface 3 on the two sides of the wide surface of the crystallizer 2. The rectangular magnetic pole 8, the magnetic yoke and the exciting coil 9 form a jet electromagnetic braking device which is arranged in the molten metal flowing area of the immersed nozzle outlet on the two sides of the wide surface of the crystallizer 2. The vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet-type electromagnetic braking device are not connected with each other, and each device is provided with an independent power supply system, so that the current intensity of each system can be independently regulated according to the flow state of the molten metal in the crystallizer 2, and the flow of the molten metal in the crystallizer 2 can be controlled in a partitioning manner.
The multi-section independent adjustable composite magnetic field device comprises a vertical electromagnetic stirring device, a horizontal electromagnetic stirring device, two jet-type electromagnetic braking devices or two vertical electromagnetic stirring devices, a horizontal electromagnetic stirring device and two jet-type electromagnetic braking devices.
The vertical electromagnetic stirring device comprises two forms, and traveling wave magnetic fields generated by the two vertical electromagnetic stirring devices on two sides of the narrow surface or the wide surface of the crystallizer 2 can drive the jet impact area to move relatively to molten metal in the meniscus area.
The first vertical electromagnetic stirring device is positioned on two sides of the wide surface of the crystallizer 2, four vertical stirring magnetic poles 4 are arranged, three stirring iron cores 6 are arranged on the inner side of each vertical stirring magnetic pole 4, stirring coils 7 are arranged on each stirring iron core 6, and two vertical stirring magnetic poles 4 which are arranged face to face form the vertical electromagnetic stirring device.
The second type of vertical electromagnetic stirring device is positioned at two sides of the narrow surface of the crystallizer 2, and is provided with two vertical stirring magnetic poles 4 which form a vertical electromagnetic stirring device, six stirring iron cores 6 are arranged at the inner side of each vertical stirring magnetic pole 4, and each stirring iron core 6 is provided with a stirring coil 7.
The traveling wave magnetic field generated by the horizontal electromagnetic stirring device on the two sides of the wide surface of the crystallizer 2 can drive the molten metal in the magnetic field area to do relative horizontal movement.
The horizontal electromagnetic stirring device is provided with two horizontal stirring magnetic poles 5 which are arranged face to face on two sides of the wide surface of the crystallizer 2, three stirring iron cores 6 are arranged on the inner side of each horizontal stirring magnetic pole 5, and each stirring iron core 6 is provided with a stirring coil 7.
The jet type electromagnetic braking device adopts a stable constant direct current magnetic field form, and the jet type electromagnetic braking device is excited at two sides of the wide surface of the crystallizer 2 to generate a stable constant direct current magnetic field vertical to the wide surface of the slab crystallizer 2, so that the jet type electromagnetic braking device can directly drive molten metal at the jet flow flowing area of the outlet of the submerged nozzle 1 to make relative movement.
The rectangular magnetic poles 8 of the jet electromagnetic brake device correspond to the magnetic yokes, exciting coils 9 are arranged on the outer sides of the rectangular magnetic poles 8, and the outer surfaces of the exciting coils 9 are in clearance fit with the inner surfaces of the magnetic yokes and the outer surfaces of the crystallizer 2.
The jet type electromagnetic braking device is provided with four rectangular magnetic poles 8, two rectangular magnetic poles 8 positioned on the same side of the wide surface of the crystallizer 2 form a jet type electromagnetic braking device, two rectangular magnetic poles 8 positioned on the other side of the wide surface of the crystallizer 2 form another jet type electromagnetic braking device, and the two jet type electromagnetic braking devices are arranged face to face.
The upper surfaces of the vertical stirring magnetic poles 4 of the two vertical electromagnetic stirring devices are 5-150 mm higher than the surface 3 of the molten metal, the magnetic pole thickness of the vertical stirring magnetic poles 4 along the width direction of the crystallizer 2 is 50-400 mm, the magnetic pole thickness of the vertical stirring magnetic poles 4 along the height direction of the crystallizer 2 is 150-1000 mm, the electromagnetic stirring frequency of the vertical stirring magnetic poles 4 is 0.01-10 Hz, and the alternating current power supply of the stirring coil 7 is 0.01-6000A.
The vertical stirring magnetic pole 4 of the first vertical electromagnetic stirring device can freely rotate in the height direction of the crystallizer 2, the rotation angle is between-60 degrees and 60 degrees, the distance L1 between the outer surface of the vertical stirring magnetic pole 4 and the narrow surface of the crystallizer 2 is 0-200 mm, and the distance L2 between the inner surfaces of the vertical stirring magnetic poles 4 positioned on the same side of the wide surface of the crystallizer 2 is 500-1500 mm.
The inner side surface of the stirring iron core 6 of the second type vertical electromagnetic stirring device is 0-200 mm away from the narrow surface of the crystallizer.
The ratio of the magnetic pole thickness of the vertical stirring magnetic pole 4 along the height direction of the crystallizer 2 to the minimum distance between the metal liquid surface 3 and the upper surface of the rectangular magnetic pole 8 of the jet-type electromagnetic braking device is more than 0.5, and the minimum distance between the lower surface of the vertical stirring magnetic pole 4 and the upper surface of the rectangular magnetic pole 8 is more than 50mm.
The upper surface of the horizontal stirring magnetic pole 5 of the horizontal electromagnetic stirring device is highAt a height of 5 on the molten metal surface 3 ～ 150mm, the magnetic pole thickness of the horizontal stirring magnetic pole 5 along the width direction of the crystallizer 2 is 50-500 mm, the magnetic pole thickness of the horizontal stirring magnetic pole 5 along the height direction of the crystallizer 2 is 50-500 mm, the distance L3 between the outer surface of the horizontal stirring magnetic pole 5 and the narrow surface of the crystallizer 2 is 150-400 mm, the electromagnetic stirring frequency of the horizontal stirring magnetic pole 5 is 0.01-10 Hz, and the alternating current power supply of the stirring coil 7 is 0.01-6000A.
The rectangular magnetic pole 8 of the jet-type electromagnetic braking device can freely rotate in the width direction of the crystallizer 2, the rotation angle is between-60 degrees and 60 degrees, the minimum distance between the upper surface of the rectangular magnetic pole 8 and the lower surface of the bottom of the submerged nozzle 1 is 50-300 mm, the magnetic pole thickness of the rectangular magnetic pole 8 along the height direction of the crystallizer 2 is 10-1000 mm, the magnetic pole thickness of the rectangular magnetic pole 8 along the width direction of the crystallizer 2 is 50-400 mm, and the magnetic induction intensity of a steady magnetic field between the rectangular magnetic poles 8 is 0.01-3T.
The multi-section independently adjustable composite magnetic field device can be freely adjusted according to the width change of the crystallizer 2, wherein the vertical electromagnetic stirring device can freely select the combination position of the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device and the jet-type electromagnetic braking device in the width direction or the height direction of the crystallizer 2 so as to realize zoned control of the molten metal flow in the crystallizer 2.
The multi-section independently adjustable composite magnetic field device and the method can adjust the running modes of the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet electromagnetic braking device on line in real time by means of the power supply phase according to different casting conditions, so as to be beneficial to flexibly controlling the flow of molten metal in the crystallizer 2, particularly near the meniscus. At high pulling speed, the operation of the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet electromagnetic braking device can reduce the speed of the flow of molten metal near the meniscus, near the inlet of the submerged nozzle 1 on the surface of molten metal and at the outlet of the submerged nozzle 1, so as to reduce the fluctuation of the meniscus near the narrow surface of the crystallizer 2 and reduce the danger of vortex, thereby being beneficial to reducing the entrainment of casting powder for high-speed continuous casting. At low pulling speed, the operation modes of the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device are opposite to those of high pulling speed, so that the flow speed of molten metal near the meniscus is increased, the melting condition of protective slag is improved, the solidification length of the primary green shell is shortened, the cleaning effect on the solidification front is improved, and the freezing of surface and subcutaneous inclusions, bubbles and meniscus is reduced.
A multi-stage independent adjustable composite magnetic field method for controlling the flow of molten metal in a crystallizer 2 adopts a multi-stage independent adjustable composite magnetic field device for controlling the flow of molten metal in the crystallizer 2 in a partitioning way, and comprises the following steps:
step 1, in the continuous casting process, molten metal enters a crystallizer 2 through a submerged nozzle 1, and the molten metal flowing out of an outlet of the submerged nozzle 1 is impacted to a narrow surface of the crystallizer 2 to form upper reflux and lower reflux;
and 2, connecting the vertical type electromagnetic stirring device and the horizontal type electromagnetic stirring device to a three-phase low-frequency power supply, and connecting the vertical type electromagnetic braking device to a direct-current power supply to form a vertical traveling wave magnetic field, a horizontal traveling wave magnetic field and a stable direct-current magnetic field respectively. The vertical travelling wave magnetic field generated by the vertical electromagnetic stirring device can inhibit the upward backflow of the molten metal from impacting the meniscus and the molten metal level near the narrow surface of the crystallizer 2 while driving the jet impact area to make relative movement to the molten metal in the meniscus area. The horizontal traveling wave magnetic field generated by the horizontal electromagnetic stirring device drives the molten metal in the free surface area of the crystallizer 2 to do relative horizontal movement, and can keep the activity of the meniscus and the molten metal surface attached to the slag layer, thereby avoiding slag solidification to form a slag ring when the flow rate of the molten metal on the liquid surface of the crystallizer 2 is too low. The steady direct current magnetic field generated by the jet electromagnetic braking device drives the molten metal at the jet flow flowing area of the outlet of the submerged nozzle 1 to move relatively, and simultaneously can reduce the penetration depth of the molten metal flowing back downwards into the molten pool of the crystallizer 2 and promote the floating removal of heterogeneous substances such as nonmetallic inclusion, bubbles and the like carried by the molten metal in the central area of the crystallizer 2.
Examples:
example 1
The implementation adopts a multi-stage independent adjustable composite magnetic field device as shown in fig. 1, wherein the magnetic pole thickness of a horizontal stirring magnetic pole 4 of a horizontal electromagnetic stirring device along the width direction of a crystallizer 2 is 390mm, the magnetic pole thickness of a vertical stirring magnetic pole 4 of a vertical electromagnetic stirring device along the height direction of the crystallizer 2 is 100mm, the magnetic pole thickness of a rectangular magnetic pole 7 of a jet-type electromagnetic braking device along the height direction of the crystallizer 2 is 90mm, the magnetic pole thickness of the horizontal stirring magnetic pole 4 of the horizontal electromagnetic stirring device along the width direction of the crystallizer 2 is 350mm, the cross section size of the crystallizer 2 is 1060mm multiplied by 100mm, and the thickness center plane of the crystallizer 2 is along the magnetic field distribution diagram of the height direction of the crystallizer 2.
A multi-stage independent adjustable composite magnetic field method for controlling the flow of molten metal in a crystallizer 2 adopts a multi-stage independent adjustable composite magnetic field device for controlling the flow of molten metal in the crystallizer 2, which comprises the following steps:
step 1, in the continuous casting process, molten metal enters a crystallizer 2 through a submerged nozzle 1, and the molten metal flowing out of an outlet of the submerged nozzle 1 is impacted to a narrow surface of the crystallizer 2 to form upper reflux and lower reflux;
and 2, respectively introducing current 800A into the horizontal electromagnetic stirring device of the multi-stage independently adjustable composite magnetic field device, introducing current 500A into the vertical electromagnetic stirring device, and after introducing current 300A into the jet-type electromagnetic braking device, respectively generating a vertical traveling wave magnetic field and a horizontal traveling wave magnetic field by the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device, and generating a steady direct current magnetic field by the jet-type electromagnetic braking device.
As can be seen from fig. 5, when the multi-stage independently adjustable composite magnetic field device is connected to a three-phase low-frequency power supply and a direct-current power supply, a vertical traveling wave magnetic field generated by the vertical electromagnetic stirring device can cover three key areas of a jet impact area, a meniscus area and a reflux area on the crystallizer 2, so that the direct-face impact of the upper reflux metal liquid on the meniscus near the narrow face of the crystallizer 2 is effectively controlled. The horizontal traveling wave magnetic field generated by the horizontal electromagnetic stirring device can cover the molten metal surface 3 and the area near the inlet of the immersion nozzle 1, so that not only is the activity of the meniscus and the slag layer attached to the molten metal surface 3 maintained, but also slag solidification is avoided to form a slag ring. The stable direct current magnetic field generated by the jet electromagnetic braking device can directly cover the metal jet flow flowing area at the outlet of the submerged nozzle 1, so that the impact of the metal liquid at the outlet of the submerged nozzle 1 on the narrow surface of the crystallizer is preferably restrained, the penetration depth of the metal liquid flowing back downwards on the molten pool of the crystallizer 2 is reduced, and further the floating removal of heterogeneous substances such as nonmetallic inclusion, bubbles and the like carried by the metal liquid in the central area of the crystallizer 2 is promoted.
Because the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet-type electromagnetic braking device are not connected with each other and are provided with independent power supply systems, the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet-type electromagnetic braking device have more flexibility in controlling the flow of molten metal in a key area of the crystallizer 2, and the current intensity of each system can be independently adjusted according to different casting conditions.
Example 2.
The implementation adopts a multi-stage independent adjustable composite magnetic field device shown in fig. 1, wherein the magnetic pole thickness of a horizontal stirring magnetic pole 4 of a horizontal electromagnetic stirring device along the width direction of a crystallizer 2 is 390mm, the magnetic pole thickness of a vertical stirring magnetic pole 4 of a vertical electromagnetic stirring device along the height direction of the crystallizer 2 is 100mm, the magnetic pole thickness of a rectangular magnetic pole 7 of a jet-type electromagnetic braking device along the height direction of the crystallizer 2 is 90mm, the magnetic pole thickness of the horizontal stirring magnetic pole 4 of the horizontal electromagnetic stirring device along the width direction of the crystallizer 2 is 350mm, the cross section size of the crystallizer 2 is 1060mm multiplied by 100mm, and the Lorentz force distribution diagram of a metal liquid surface 3 of the crystallizer 2 along the width direction of the crystallizer 2 is realized.
A multi-stage independent adjustable composite magnetic field method for controlling the flow of molten metal in a crystallizer 2 adopts a multi-stage independent adjustable composite magnetic field device for controlling the flow of molten metal in the crystallizer 2, which comprises the following steps:
step 1, in the continuous casting process, molten metal enters a crystallizer 2 through a submerged nozzle 1, and the molten metal flowing out of an outlet of the submerged nozzle 1 is impacted to a narrow surface of the crystallizer 2 to form upper reflux and lower reflux;
and 2, when the multi-stage independent adjustable composite magnetic field device operates, the current intensities of the horizontal electromagnetic stirring device, the vertical electromagnetic stirring device and the jet type electromagnetic braking device can be independently adjusted, current 600A is respectively fed into the horizontal electromagnetic stirring device of the multi-stage independent adjustable composite magnetic field device, current 500A is fed into the vertical electromagnetic stirring device, after current 300A is fed into the jet type electromagnetic braking device, the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device respectively generate a vertical travelling wave magnetic field and a horizontal travelling wave magnetic field, and the jet type electromagnetic braking device generates a steady direct current magnetic field.
As can be seen from FIG. 6, the Lorentz force on the horizontal section of the crystallizer 2 along the width direction of the crystallizer 2 at a position 65mm lower than the surface of the molten metal is in vortex distribution, and can drive the molten metal surface 3 and the molten metal in the area near the inlet of the submerged nozzle 1 to do relative horizontal movement. Therefore, the lorentz force generated by the horizontal electromagnetic stirring device can keep the activity of adhering the meniscus and the molten metal surface 3 to the slag layer while improving the flow speed of the molten metal on the molten metal surface 3 and the region near the inlet of the immersion nozzle 1, improves the melting condition of the protecting slag, and further avoids slag solidification to form a slag ring.
The multi-section independently adjustable composite magnetic field device adopts the vertical electromagnetic stirring device, the horizontal electromagnetic braking device and the jet-type electromagnetic braking device, so that the generated composite magnetic field can more effectively partition and control the metal liquid flow in the crystallizer, and meanwhile, the multi-section independently adjustable composite magnetic field device can accurately control the composite magnetic field by utilizing different magnetic field forms, electromagnetic force sizes and action positions, thereby obtaining high-quality metal liquid flow state and improving casting blank quality.
It should be understood that the foregoing detailed description of the present invention is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention may be modified or substituted for the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (6)
1. The utility model provides a multistage position independently adjustable compound magnetic field device that control molten metal flows which characterized in that: comprises three parts: a vertical electromagnetic stirring device, a horizontal electromagnetic stirring device and a jet type electromagnetic braking device; the three parts independently adjust the current intensity according to different casting conditions, and the flow of the molten metal in the slab continuous casting crystallizer is controlled in a partitioning way;
the vertical electromagnetic stirring device comprises a vertical stirring magnetic pole, a stirring iron core and a stirring coil, wherein the stirring coil is sleeved outside the stirring iron core, the stirring magnetic pole is arranged at the outer end part of the stirring iron core, and the vertical stirring magnetic pole, the stirring iron core and the stirring coil form an integrated structure; two of the two groups are combined into a group, symmetrically arranged on the wide surface or the narrow surface of the crystallizer; the traveling wave magnetic field generated by the vertical electromagnetic stirring device can drive the jet impact area to the molten metal in the meniscus area to do relative motion; when the vertical electromagnetic stirring device is arranged on the wide surface of the crystallizer, three stirring iron cores are arranged on the inner side of each vertical stirring magnetic pole; when the vertical electromagnetic stirring device is arranged on the narrow surface of the crystallizer, six stirring iron cores are arranged on the inner side of each vertical stirring magnetic pole;
the horizontal electromagnetic stirring device comprises a horizontal stirring magnetic pole, a stirring iron core and a stirring coil, wherein the stirring coil is sleeved outside the stirring iron core, the stirring magnetic pole is arranged at the outer end part of the stirring iron core, and the horizontal stirring magnetic pole, the stirring iron core and the stirring coil form an integrated structure; three stirring iron cores are arranged on the inner side of each horizontal stirring magnetic pole, and each stirring iron core is provided with a stirring coil; the horizontal electromagnetic stirring devices are arranged on the wide surface of the crystallizer and on two sides of molten metal in a pair by pair mode; the traveling wave magnetic field generated by the horizontal electromagnetic stirring device on the two sides of the wide surface of the crystallizer can drive the molten metal in the magnetic field area to do relative horizontal movement;
the jet-type electromagnetic braking device comprises an integrated structure formed by rectangular magnetic poles, magnetic yokes and exciting coils, wherein the jet-type electromagnetic braking devices are arranged on two sides of a molten metal flowing area of a wide surface of a crystallizer and an immersed nozzle outlet in a symmetrical mode; the jet type electromagnetic braking device adopts a stable constant direct current magnetic field form, and the jet type electromagnetic braking device is excited at two sides of the wide surface of the crystallizer to generate a stable constant direct current magnetic field perpendicular to the wide surface of the slab crystallizer so as to directly drive molten metal in a jet flow flowing area at an outlet of the submerged nozzle to perform relative motion; the rectangular magnetic poles and the magnetic yokes correspond to each other, exciting coils are arranged on the outer sides of the rectangular magnetic poles, and the outer surfaces of the exciting coils are in clearance fit with the inner surfaces of the magnetic yokes and the outer surfaces of the crystallizers;
the upper surface of the vertical stirring magnetic pole of the vertical electromagnetic stirring device is 5-150 mm higher than the surface of the molten metal, the electromagnetic stirring frequency of the vertical stirring magnetic pole is 0.01-10 Hz, and the alternating current power supply of the stirring coil is 0.01-6000A;
when the vertical electromagnetic stirring device is positioned on the wide surface of the crystallizer, the vertical stirring magnetic pole can freely rotate in the height direction of the crystallizer, the rotation angle is between-60 degrees and 60 degrees, the distance L1 between the outer surface of the vertical stirring magnetic pole and the narrow surface of the crystallizer is 0-200 mm, and the distance L2 between the inner surfaces of the vertical stirring magnetic poles positioned on the same side of the wide surface of the crystallizer is 500-1500 mm;
the height of the upper surface of the horizontal stirring magnetic pole of the horizontal electromagnetic stirring device, which is higher than the surface of the molten metal, is 5-150 mm;
the distance L3 between the outer surface of the horizontal stirring magnetic pole and the narrow surface of the crystallizer is 150-400 mm, the electromagnetic stirring frequency of the horizontal stirring magnetic pole is 0.01-10 Hz, and the alternating current power supply of the stirring coil is 0.01-6000A;
the rectangular magnetic pole of the jet-type electromagnetic braking device can freely rotate in the width direction of the crystallizer, the rotation angle is between-60 degrees and 60 degrees, the minimum distance between the upper surface of the rectangular magnetic pole and the lower surface of the bottom of the immersed nozzle is 50-300 mm,
the magnetic induction intensity of the steady magnetic field between the rectangular magnetic poles is 0.01-3T;
the vertical electromagnetic stirring device can freely select the combination arrangement position of the horizontal electromagnetic stirring device and the jet-type electromagnetic braking device in the width direction or the height direction of the crystallizer.
2. The multi-stage independently adjustable composite magnetic field device for controlling the flow of molten metal according to claim 1, wherein: the thickness of the vertical stirring magnetic pole along the width direction of the crystallizer is 50-400 mm, and the thickness of the vertical stirring magnetic pole along the height direction of the crystallizer is 150-1000 mm.
3. The multi-stage independently adjustable composite magnetic field device for controlling the flow of molten metal according to claim 2, wherein: the magnetic pole thickness of the horizontal stirring magnetic pole along the width direction of the crystallizer is 50-500 mm, and the magnetic pole thickness of the horizontal stirring magnetic pole along the height direction of the crystallizer is 50-500 mm.
4. A multi-stage independently adjustable composite magnetic field device for controlling molten metal flow according to claim 3, wherein: the magnetic pole thickness of the rectangular magnetic pole along the height direction of the crystallizer is 10-1000 mm, and the magnetic pole thickness of the rectangular magnetic pole along the width direction of the crystallizer is 50-400 mm.
5. The multi-stage independently adjustable composite magnetic field device for controlling the flow of molten metal according to claim 1, wherein: at high pulling speed, the running of the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet electromagnetic braking device decelerates the flow of the metal liquid which is controlled by the vertical electromagnetic stirring device, the horizontal electromagnetic stirring device and the jet electromagnetic braking device; at low pull rates, the operation modes of the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device are opposite to those of the high pull rates, so that the flow rates of the metal liquid controlled by the vertical electromagnetic stirring device and the horizontal electromagnetic stirring device are improved.
6. A multi-stage independently adjustable composite magnetic field method for controlling the flow of molten metal, characterized in that the multi-stage independently adjustable composite magnetic field device for controlling the flow of molten metal according to any one of claims 1 to 5 comprises the following steps:
in the continuous casting process, molten metal enters a crystallizer through a submerged nozzle, and the molten metal flowing out of an outlet of the submerged nozzle is impacted to a narrow surface of the crystallizer to form an upper reflux and a lower reflux;
step 2, connecting the vertical type electromagnetic stirring device and the horizontal type electromagnetic stirring device to a three-phase low-frequency power supply, and connecting the jet type electromagnetic braking device to a direct-current power supply to form a vertical traveling wave magnetic field, a horizontal traveling wave magnetic field and a steady direct-current magnetic field respectively; the vertical traveling wave magnetic field generated by the vertical electromagnetic stirring device can inhibit the upward backflow of the molten metal from impacting the meniscus and the molten metal level near the narrow surface of the crystallizer while driving the jet impact area to make relative movement to the molten metal in the meniscus area; the horizontal traveling wave magnetic field generated by the horizontal electromagnetic stirring device drives the molten metal in the free surface area of the crystallizer to do relative horizontal movement, and can keep the activity of the meniscus and the molten metal surface attached slag layer, so that slag solidification is avoided to form a slag ring when the flow rate of the molten metal on the liquid surface of the crystallizer is too low; the stable direct current magnetic field generated by the jet electromagnetic braking device drives the molten metal in the jet flow flowing area of the outlet of the immersion nozzle to move relatively, so that the penetration depth of the molten metal flowing back downwards to a molten pool of the crystallizer can be reduced, and the floating removal of nonmetallic inclusion and bubbles entrained by the molten metal in the central area of the crystallizer is promoted.
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