WO2018014663A1 - Vertical electromagnetic braking device for controlling flow of molten steel in continuous casting crystallizer - Google Patents

Vertical electromagnetic braking device for controlling flow of molten steel in continuous casting crystallizer Download PDF

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Publication number
WO2018014663A1
WO2018014663A1 PCT/CN2017/087116 CN2017087116W WO2018014663A1 WO 2018014663 A1 WO2018014663 A1 WO 2018014663A1 CN 2017087116 W CN2017087116 W CN 2017087116W WO 2018014663 A1 WO2018014663 A1 WO 2018014663A1
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WO
WIPO (PCT)
Prior art keywords
magnetic pole
vertical
horizontal magnetic
molten steel
crystallizer
Prior art date
Application number
PCT/CN2017/087116
Other languages
French (fr)
Chinese (zh)
Inventor
王恩刚
李壮
许琳
李菲
邓安元
张兴武
张�林
Original Assignee
东北大学
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 东北大学 filed Critical 东北大学
Priority to JP2018553130A priority Critical patent/JP6637618B2/en
Priority to EP17830300.4A priority patent/EP3441158B1/en
Publication of WO2018014663A1 publication Critical patent/WO2018014663A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/186—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means

Definitions

  • the invention belongs to the technical field of continuous casting, and particularly relates to a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold.
  • the molten steel enters the crystallizer through the immersion nozzle at a certain jet angle, and the molten steel flowing out from the immersion nozzle will impact the side surface of the crystallizer at a certain flow rate, thereby forming the upper return flow and the lower flow. Backflow.
  • the upper reflowing molten steel will impact the surface of the molten steel in the crystallizer, which will cause fluctuations in the liquid surface, especially the liquid level fluctuation near the meniscus on the side of the crystallizer, which may easily cause the slag phenomenon.
  • the downward flow of the molten steel has a large penetration depth, and the heterogeneous substances such as inclusions and bubbles in the molten steel are brought to a deep position of the crystallizer, and the heterogeneous substance is not easy to float, and may be initially solidified by the molten steel. Captured at the leading edge of the shell, causing surface or subcutaneous defects in the slab.
  • the molten steel flowing out from the immersion nozzle exerts an impact on the initially solidified shell in the crystallizer, which also causes the initial solidified shell to be thinned or uneven, which is liable to cause a steel leakage accident.
  • the technician usually installs an electromagnetic brake in the horizontal direction of the wide surface of the crystallizer, and a static magnetic field is formed in the crystallizer by the electromagnetic brake, and the molten steel flowing in the crystallizer is subjected to a steady magnetic field.
  • the molten metal flows in the opposite direction of the electromagnetic force, thereby achieving the purpose of controlling the flow of molten steel in the mold.
  • the electromagnetic brakes for generating a steady-state magnetic field mainly include a regional electromagnetic brake device, a full-width one-stage electromagnetic brake device, and a full-width two-stage electromagnetic brake device.
  • the regional electromagnetic brake device can generate a steady-state magnetic field acting on the outflow region of the side hole of the crystallizer nozzle, thereby controlling the flow of the molten steel flowing out of the immersion nozzle, but the steady-state magnetic field generated by the same Limited action area, can not effectively control the flow of molten steel in the entire mold And it is easy to generate other defects such as channels.
  • the full-width one-stage electromagnetic brake device (for example, Chinese Patent Application No. 98810685.X), which generates a steady-state magnetic field by a pair of horizontal magnetic poles disposed under the immersion nozzle and covering the entire wide surface of the crystallizer, thereby controlling The depth of impact of the molten steel under the entire wide surface of the crystallizer, however, it does not effectively control the fluctuation of the molten steel on the surface of the molten steel in the crystallizer and the slag.
  • a steady magnetic field is generated by a pair of horizontal magnetic poles disposed in a surface area of a molten steel of a crystallizer and a pair of horizontal magnetic poles located below the submerged nozzle.
  • the horizontal magnetic poles of the two can not be adjusted in the height direction.
  • the process parameters such as surface height and pulling speed change, the matching relationship between horizontal magnetic pole and process parameters will also undergo various changes, and it is impossible to maintain a reasonable and optimal matching relationship at all times, which will seriously affect the metallurgical effect of electromagnetic braking. It even suppresses the adverse effects of the floating of heterogeneous substances such as inclusions and bubbles.
  • the Chinese patent No. 200810011104.7 also discloses an electromagnetic brake device in which two pairs of vertical magnetic poles are arranged in the vicinity of both sides of the crystallizer and along the height direction of the crystallizer, and the vertical magnetic pole covers the molten steel near the side of the crystallizer.
  • Surface area with The nozzle exits the impact region and generates a steady-state magnetic field, and the steady-state magnetic field generated by the two pairs of vertical magnetic poles controls the surface fluctuation of the molten steel near the meniscus of the crystallizer and the flow of the outlet point of the nozzle, the electromagnetic brake device
  • the braking effect on the area near the side of the mold is less affected by changes in the parameters of the continuous casting process.
  • the electromagnetic brake device is composed of two yokes, a magnetic pole and an exciting coil that surround the side of the crystallizer.
  • the width of the vertical magnetic pole in the wide direction of the crystallizer is limited.
  • the width of the crystallizer is large, the steady magnetic field strength in the central region of the crystallizer is weak, and the impact depth of the returning molten steel in the central region of the crystallizer cannot be effectively controlled. Therefore, it is not conducive to the floating of heterogeneous substances such as inclusions and bubbles.
  • the present invention provides a completely improved design of a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, which is preferentially suppressed.
  • the impact of the molten steel flowing out of the nozzle on the side of the crystallizer and the surface of the molten steel at the meniscus At the same time, it can control the flow of molten steel in the central region of the crystallizer, avoiding the low flow rate of the molten steel surface in the central region of the crystallizer and the excessive impact of the downward molten steel flow, so as to inhibit the fluctuation of the molten steel surface and the slag rolling, and promote The floating matter of foreign matter such as inclusions and bubbles.
  • the metallurgical effect of its electromagnetic braking is less affected by changes in process parameters.
  • a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, comprising a horizontal magnetic pole, an exciting coil, a vertical magnetic pole and a yoke;
  • the vertical magnetic pole is provided with two pairs;
  • a pair of the horizontal magnetic poles are located below the intrusive nozzle and arranged along the wide surface of the crystallizer, two pairs of the vertical magnetic poles are respectively arranged near the two side regions of the crystallizer, two opposite The magnetic pole and the pair of horizontal magnetic poles meet;
  • the exciting coil and the yoke are matched with the horizontal magnetic pole, and a current is applied through the exciting coil to generate a steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole, and the steel flowing in the crystallizer
  • the liquid passes through the steady-state magnetic field, it receives an electromagnetic force opposite to the flow direction of the molten steel, and the electromagnetic force controls the flow of the molten steel in the crystallizer.
  • a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold comprising a horizontal magnetic pole, an excitation coil, a vertical magnetic pole and a yoke; the horizontal magnetic pole and the vertical magnetic pole are respectively provided with two pairs;
  • the horizontal magnetic pole is located below the intrusive nozzle and arranged along the wide surface of the crystallizer and is recorded as the lower horizontal magnetic pole;
  • the other pair of horizontal magnetic poles are located near the surface of the molten steel in the crystallizer and are arranged along the wide surface of the crystallizer, and are recorded as the upper part.
  • a horizontal magnetic pole two pairs of the vertical magnetic poles are respectively disposed near two side regions of the crystallizer, and two pairs of vertical magnetic poles intersect with two pairs of horizontal magnetic poles; the excitation coil and the yoke are matched with the horizontal magnetic poles, and the excitation coils are passed through the excitation coils
  • a current is applied, a steady magnetic field is generated between the horizontal magnetic pole and the vertical magnetic pole, and the molten steel flowing in the crystallizer receives an electromagnetic force opposite to the flow direction of the molten steel when passing through the steady magnetic field, and controls the molten steel in the crystallizer by the electromagnetic force. flow.
  • connection between two pairs of the vertical magnetic pole and a pair of horizontal magnetic poles at the intersection is:
  • the vertical magnetic pole is vertically mounted on the horizontal magnetic pole
  • the vertical magnetic poles are perpendicularly connected to the horizontal magnetic poles on the upper surface and the lower surface of the horizontal magnetic pole, respectively;
  • the vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the horizontal magnetic pole;
  • the vertical pole is connected perpendicularly to the horizontal pole only on the lower surface of the horizontal pole.
  • connection between two pairs of said vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection is:
  • the vertical magnetic pole is only vertically mounted on the upper horizontal magnetic pole
  • the vertical magnetic pole is vertically embedded on the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole;
  • the vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the lower horizontal magnetic pole;
  • the vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole on the lower surface of the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole;
  • the vertical pole is connected perpendicularly to the horizontal pole only on the lower surface of the upper horizontal pole.
  • the height of the vertical pole is required to cover an area 100 mm above the surface of the molten steel in the crystallizer and extending 1000 mm downward.
  • the vertical magnetic pole has a width ranging from 50 mm to 400 mm.
  • the magnetic induction intensity of the steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole is 0.01T to 3T.
  • the combined position of the vertical magnetic pole and the horizontal magnetic pole is freely selected in the direction of the width of the crystallizer.
  • the vertical magnetic pole of the present invention does not need to be provided with an exciting coil, which can be combined with the horizontal magnetic pole in different connection manners, and only uses the exciting coil on the horizontal magnetic pole to generate a steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole.
  • the invention adopts two pairs of vertical magnetic poles to form a steady magnetic field by means of a pair of horizontal magnetic poles or two pairs of horizontal magnetic poles.
  • the two pairs of vertical magnetic poles can cover the molten steel surface near the two sides of the crystallizer along the height direction of the crystallizer.
  • the initial solidified shell front region can control the molten steel flow region from the molten steel surface to the nozzle outlet and the horizontal magnetic pole near the side of the crystallizer, so that the outlet molten steel receives the magnetic field before impacting the side of the crystallizer.
  • the height requirement of the vertical magnetic pole of the present invention is to cover a region 100 mm above the surface of the molten steel in the crystallizer and extending downward by 1000 mm, that is, to cover a certain depth region from above the surface of the molten steel near the side of the crystallizer to below the immersion nozzle.
  • the process parameters such as nozzle immersion depth, nozzle outlet angle, liquid level height and drawing speed change, the molten steel flow near the side of the crystallizer is always in the area covered by the vertical magnetic pole. Therefore, it is possible to effectively control the surface fluctuation of the molten steel near the side of the crystallizer and the impact depth of the molten steel, so that the braking effect is less affected by the variation of the process parameters.
  • the horizontal magnetic poles arranged by the wide surface of the crystallizer control the downward flow of the molten steel in the central portion of the crystallizer, and reduce the molten steel.
  • the impact depth achieves the purpose of promoting inclusions and bubbles floating.
  • the vertical magnetic pole can be used in combination with a pair of horizontal magnetic poles located near the surface of the molten steel of the crystallizer, and one type is selected.
  • the magnetic field strength of the vertical magnetic pole can be increased to control the flow at the meniscus on the side of the crystallizer, and the fluctuation of the molten steel surface at the meniscus and the slag rolling can be prevented; meanwhile, relatively Attenuating the magnetic field strength of the upper horizontal magnetic pole, or applying no current to the upper horizontal magnetic pole, and maintaining proper flow velocity and heat exchange capacity of the molten steel surface while appropriately controlling the fluctuation of the molten steel surface in the central region of the crystallizer, It is good for the melting of the slag and the adsorption of inclusions, so as to obtain a good electromagnetic braking effect.
  • FIG. 1 is a schematic structural view of a vertical electromagnetic brake device (provided with a pair of horizontal magnetic poles) for controlling the flow of molten steel in a continuous casting mold according to the present invention
  • FIG. 2 is a schematic view showing the flow of molten steel and the arrangement of magnetic poles in the crystallizer of the vertical electromagnetic brake device of FIG. 1;
  • Figure 3 (a) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 1 (the vertical magnetic pole is vertically embedded on the horizontal magnetic pole);
  • Figure 3 (b) is a schematic view showing the connection of two pairs of vertical magnetic poles and a pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 1 (the vertical magnetic poles are respectively on the upper and lower surfaces of the horizontal magnetic pole and horizontally Magnetic pole vertical connection);
  • 3(c) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of FIG. 1 (the vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole only on the upper surface of the horizontal magnetic pole) );
  • Figure 3 (d) is a schematic view showing the connection of two pairs of vertical magnetic poles and a pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 1 (the vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole only on the lower surface of the horizontal magnetic pole) );
  • FIG. 4 is a schematic structural view of a vertical electromagnetic brake device (with two pairs of horizontal magnetic poles) for controlling the flow of molten steel in a continuous casting mold according to the present invention
  • Figure 5 (a) is a schematic view showing the flow of molten steel and the arrangement of the magnetic poles in the crystallizer of the vertical electromagnetic brake device of Figure 4 (the direction of the wide side of the crystallizer);
  • Figure 5 (b) is a schematic view showing the flow of molten steel and the arrangement of the magnetic poles in the crystallizer of the vertical electromagnetic brake device of Figure 4 (the direction of the narrow side of the crystallizer);
  • Figure 6 (a) is a schematic view showing the connection mode of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic poles are vertically embedded in the upper horizontal magnetic pole and the lower horizontal magnetic pole respectively;
  • Figure 6 (b) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 (vertical The magnetic pole is only vertically mounted on the lower horizontal magnetic pole);
  • Figure 6 (c) is a schematic view showing the connection manner of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic pole is only vertically mounted on the upper horizontal magnetic pole);
  • Figure 6 (d) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 (The vertical magnetic pole is vertically embedded on the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole);
  • Figure 6 (e) is a schematic view showing the connection manner of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic poles are perpendicularly connected to the horizontal magnetic poles on the upper and lower surfaces of the lower horizontal magnetic poles respectively);
  • Figure 6 (f) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 (The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the lower horizontal magnetic pole);
  • Figure 6 (g) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 (The vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole on the lower surface of the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole);
  • Figure 6 (h) is a schematic view showing the connection manner of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 (The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the lower surface of the upper horizontal magnetic pole);
  • Figure 7 is a magnetic field distribution diagram of the center of the vertical magnetic pole of the central section of the crystallizer along the height direction (using the vertical electromagnetic brake device of Figure 1);
  • Figure 8 (a) is a diagram showing the fluctuation of the liquid level of the molten metal near the side of the crystallizer without electromagnetic braking (using the vertical electromagnetic brake device of Figure 1);
  • Figure 8 (b) is a diagram showing the fluctuation of the liquid level of the molten metal near the side of the crystallizer under electromagnetic braking conditions (using the vertical electromagnetic brake device of Figure 1);
  • Figure 9 is a diagram showing the internal magnetic field distribution of the molten steel in the crystallizer when a current of 850 A is applied (using the vertical electromagnetic brake device of Fig. 1);
  • Figure 10 (a) is a flow diagram of the flow of molten steel in the central section of the side of the mold without electromagnetic braking (using the vertical electromagnetic brake device of Figure 1);
  • Figure 10 (b) is a flow diagram of the flow of molten steel in the central section of the side of the crystallizer under electromagnetic braking conditions (using the vertical electromagnetic brake device of Figure 1);
  • Figure 11 is a flow chart showing the flow velocity of the molten steel surface at the center section of the side of the crystallizer with or without electromagnetic braking (using the vertical electromagnetic brake device of Fig. 1);
  • a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold includes a horizontal magnetic pole 1, an exciting coil 2, a vertical magnetic pole 3, and a yoke 5; the horizontal magnetic pole 1 A pair is provided, and the vertical magnetic pole 3 is provided with two pairs; a pair of the horizontal magnetic poles 1 are located below the intrusive nozzle 4 and are arranged along the wide surface of the crystallizer 7, and two pairs of the vertical magnetic poles 3 are respectively arranged in the crystallizer 7 In the vicinity of the side area, the two pairs of vertical magnetic poles 3 and the pair of horizontal magnetic poles 1 meet; the exciting coil 2 and the yoke 5 are all fitted with the horizontal magnetic pole 1, and current is applied through the exciting coil 2, and the horizontal magnetic pole 1 and the vertical type A steady-state magnetic field is generated between the magnetic poles 3, and the molten steel flowing in the crystallizer 7 receives an electromagnetic force opposite to the flow direction of the molten steel when passing through the steady-state magnetic field, and the flow
  • a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, comprising a horizontal magnetic pole 1, an exciting coil 2, a vertical magnetic pole 3, and a magnetic body a yoke 5; the horizontal magnetic pole 1 and the vertical magnetic pole 3 are respectively provided with two pairs; a pair of the horizontal magnetic poles 1 are located below the intrusive nozzle 4 and are arranged along the wide surface of the crystallizer 7 and are recorded as the lower horizontal magnetic pole 1; A pair of said horizontal magnetic poles 1 are located near the molten steel surface 6 in the crystallizer 7 and are arranged along the wide surface of the crystallizer 7 and are referred to as upper horizontal magnetic poles 1; two pairs of said vertical magnetic poles 3 are respectively arranged on both sides of the crystallizer 7 In the vicinity of the region, two pairs of vertical magnetic poles 3 and two pairs of horizontal magnetic poles 1 meet; the exciting coil 2 and the yoke 5 are matched with the horizontal magnetic pole 1, and a current
  • connection manner of the two pairs of the vertical magnetic pole 3 and the pair of horizontal magnetic poles 1 at the intersection is as follows:
  • the vertical magnetic poles 3 are vertically connected to the horizontal magnetic pole 1 on the upper surface and the lower surface of the horizontal magnetic pole 1, respectively;
  • the vertical magnetic pole 3 is perpendicularly connected to the horizontal magnetic pole 1 only on the upper surface of the horizontal magnetic pole 1;
  • the vertical magnetic pole 3 is vertically connected to the horizontal magnetic pole 1 only on the lower surface of the horizontal magnetic pole 1.
  • vertical magnetic poles 3 are vertically embedded in the upper horizontal magnetic pole 1 and the lower horizontal magnetic pole 1 respectively;
  • vertical magnetic pole 3 is only vertically embedded in the lower horizontal magnetic pole 1;
  • the vertical magnetic pole 3 is only vertically embedded on the upper horizontal magnetic pole 1;
  • the vertical magnetic pole 3 is vertically mounted on the upper horizontal magnetic pole 1, and the vertical magnetic pole 3 is on the lower surface of the lower horizontal magnetic pole 1 Vertically connected to the horizontal magnetic pole 1;
  • vertical magnetic poles 3 are vertically connected to the horizontal magnetic pole 1 on the upper surface and the lower surface of the lower horizontal magnetic pole 1, respectively;
  • the vertical magnetic pole 3 is perpendicularly connected to the horizontal magnetic pole 1 only on the upper surface of the lower horizontal magnetic pole 1;
  • the vertical magnetic pole 3 is perpendicularly connected to the horizontal magnetic pole 1 on the lower surface of the upper horizontal magnetic pole 1, and the vertical magnetic pole 3 is vertically connected to the horizontal magnetic pole 1 on the lower surface of the lower horizontal magnetic pole 1;
  • the vertical magnetic pole 3 is vertically connected to the horizontal magnetic pole 1 only on the lower surface of the upper horizontal magnetic pole 1.
  • the height of the vertical magnetic pole 3 is required to cover an area 100 mm above the molten steel surface 6 in the crystallizer 7 and extending downward by 1000 mm.
  • the width of the vertical magnetic pole 3 ranges from 50 mm to 400 mm.
  • the magnetic induction intensity of the steady magnetic field between the horizontal magnetic pole 1 and the vertical magnetic pole 3 is 0.01T to 3T.
  • the bonding position of the vertical magnetic pole 3 and the horizontal magnetic pole 1 is freely selected in the width direction of the crystallizer 7 in accordance with the adjustment of the width of the crystallizer 7 and the actual need to control the flow of the molten steel.
  • the vertical electromagnetic brake device shown in FIG. 1 is adopted, and the vertical magnetic pole 3 and the horizontal magnetic pole 1 are connected by the connection of FIG. 3(a), and the vertical magnetic pole 3 covers the side of the crystallizer 7 from the steel in height.
  • the cross-sectional dimension of the crystallizer 7 is 300 mm ⁇ 50 mm, and the height of the vertical magnetic pole 3 is 240 mm.
  • a current of 700 A and 1050 A is applied to the exciting coil 2 of the horizontal magnetic pole 1, and a magnetic field distribution of the center of the vertical magnetic pole of the central section of the crystallizer in the height direction is shown in FIG.
  • the magnetic induction intensity gradually increases, reaching the maximum at the center of the horizontal magnetic pole 1 coverage area; when the applied current is increased from 700A to 1050A, the maximum magnetic induction intensity at the center of the horizontal magnetic pole 1 is increased by 0.46T. Up to 0.52T; and at the upper and lower ends of the vertical magnetic pole 3, that is, near the molten steel surface 6 of the crystallizer 7 and below the horizontal magnetic pole 1, the magnetic induction intensity is 0.21T to 0.25T. Therefore, when the vertical magnetic pole 3 is not provided with the exciting coil 2, the connection between the vertical magnetic pole 3 and the horizontal magnetic pole 1 can be made in the region covered by the vertical magnetic pole 2 by the exciting coil 2 of the horizontal magnetic pole 1.
  • the strong magnetic field achieves the purpose of controlling the flow of molten steel in the crystallizer 7.
  • the vertical electromagnetic brake device shown in FIG. 1 is used.
  • the test object selects the molten metal of the low melting point alloy SnPbBi; the vertical magnetic pole 3 and the horizontal magnetic pole 1 using the connection mode of Fig.
  • the vertical magnetic pole 3 covers the impact point of the molten steel surface from the molten steel surface 6 side to the inflowing nozzle 4 and the lower surface of the horizontal magnetic pole 1 in the height of the mold 7
  • the thickness of 7 is 100 mm
  • the half width of the crystallizer 7 is 600 mm
  • the height of the vertical magnetic pole 3 is 440 mm
  • the inclination of the side hole of the intrusive nozzle 4 is -15°
  • the penetration depth of the intrusive nozzle 4 is 100 mm.
  • the billet speed was 1.27 m/min.
  • a current is applied to the exciting coil 2 of the horizontal magnetic pole 1, so that a magnetic field of about 0.28 T is generated in the crystallizer 7 located in the middle of the pair of vertical magnetic poles 3, and the molten metal near the side of the crystallizer is present with or without electromagnetic braking.
  • the liquid level fluctuation diagram is shown in Fig. 8(a) and Fig. 8(b).
  • the vertical electromagnetic brake device shown in FIG. 1 is used.
  • the vertical magnetic pole 3 and the horizontal magnetic pole 1 are connected in the manner of FIG. 3(c), and the vertical magnetic pole 3 below the horizontal magnetic pole 1 has a height of 0 mm.
  • the vertical magnetic pole 3 covers the impact point of the molten steel surface 6 from the molten steel surface 6 side to the inflowing nozzle 4 and the upper portion of the horizontal magnetic pole 1 in the height of the surface of the crystallizer 7 , and the cross section of the crystallizer 7 is 1400 mm ⁇ 230 mm.
  • the side hole inclination angle of the nozzle 4 is -15°, the intrusion depth of the intrusive nozzle 4 is 170 mm, and the casting speed is 1.6 m/min.
  • a current of 850 A is applied to the exciting coil 2 of the horizontal magnetic pole 1, and the internal magnetic field distribution of the molten steel in the crystallizer 7 is as shown in FIG. 9, and the molten steel flow of the central section of the side surface of the crystallizer with or without electromagnetic braking is present.
  • the field distribution is shown in Figure 10(a) and Figure 10(b).
  • the flow velocity profile of the molten steel surface at the center section of the side of the crystallizer with or without electromagnetic braking is shown in Fig. 11.
  • the magnetic induction intensity in the molten steel is mainly concentrated in the area covered by the horizontal magnetic pole 1 and the vertical magnetic pole 3, and the magnetic induction intensity of the area covered by the horizontal magnetic pole 1 in which the exciting coil 2 is disposed is the strongest and the maximum value is reached. 0.356T, and the magnetic induction intensity of the area covered by the vertical magnetic pole 3 is about 0.2T to 0.3T. Therefore, when the vertical magnetic pole 3 is not provided with the exciting coil 2, the connection between the vertical magnetic pole 3 and the horizontal magnetic pole 1 can be made in the region covered by the vertical magnetic pole 2 by the exciting coil 2 of the horizontal magnetic pole 1.
  • the strong magnetic field achieves the purpose of controlling the flow of molten steel in the crystallizer 7.
  • the vertical electromagnetic brake device of the present invention can effectively control the surface fluctuation of the molten steel on the side of the mold and the flow velocity of the molten steel surface, and can also control the downward flow of the molten steel in the central portion of the crystallizer 7.

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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

A vertical electromagnetic braking device for controlling a flow of molten steel in a continuous casting crystallizer, comprising horizontal magnetic poles (1), a magnet exciting coil (2), vertical magnetic poles (3) and a magnet yoke (5); the device comprises two pairs of the vertical magnetic poles (3), one pair or two pairs of the horizontal magnetic poles (1). When the device comprises one pair of the horizontal magnetic poles (1), the pair of the horizontal magnetic poles (1) are located below an intrusive type water opening (4), and arranged along a wide face of the crystallizer (7); when the device comprises two pairs of the horizontal magnetic poles (1), said poles are respectively referred to as upper horizontal magnetic poles (1) and lower horizontal magnetic poles (1), the lower horizontal magnetic poles (1) are located below an intrusive type water opening (4) and arranged along a wide face of the crystallizer (7), the upper horizontal magnetic poles (1) are located near a surface of the molten steel in the crystallizer (7) and arranged along the wide face of the crystallizer (7). The two pairs of the vertical magnetic poles (3) are respectively arranged near two side face areas of the crystallizer (7) and intersect with the one pair of horizontal magnetic poles (1) or two pairs of horizontal magnetic poles (1); both the magnet exciting coil (2) and the magnet yoke (5) are matched with and mounted on the horizontal magnetic poles (1), a current is applied by means of the magnet exciting coil (2), a steady-state magnetic field is generated between the horizontal magnetic poles (1) and the vertical magnetic poles (3); when passing through the steady-state magnetic field, the molten steel flowing in the crystallizer (7) receives an electromagnetic force opposite to the flowing direction of the molten steel, and the flow of the molten steel in the crystallizer is controlled by means of the electromagnetic force.

Description

一种控制连铸结晶器内钢液流动的立式电磁制动装置  Vertical electromagnetic brake device for controlling molten steel flow in continuous casting mold
技术领域 Technical field
本发明属于连铸技术领域，特别是涉及一种控制连铸结晶器内钢液流动的立式电磁制动装置。 The invention belongs to the technical field of continuous casting, and particularly relates to a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold.
背景技术 Background technique
在连铸生产过程中，钢液通过浸入式水口以一定的射流角度进入到结晶器内，从浸入式水口流出的钢液会以一定的流速冲击结晶器侧面区域，进而形成上返流和下返流。 In the continuous casting production process, the molten steel enters the crystallizer through the immersion nozzle at a certain jet angle, and the molten steel flowing out from the immersion nozzle will impact the side surface of the crystallizer at a certain flow rate, thereby forming the upper return flow and the lower flow. Backflow.
上返流的钢液会冲击结晶器内的钢液表面，进而造成液面波动，特别是会加剧结晶器侧面弯月面附近的液面波动，容易造成卷渣现象。 The upper reflowing molten steel will impact the surface of the molten steel in the crystallizer, which will cause fluctuations in the liquid surface, especially the liquid level fluctuation near the meniscus on the side of the crystallizer, which may easily cause the slag phenomenon.
下返流的钢液穿透深度较大，会将钢液中的夹杂物、气泡等异相物质带入到结晶器较深的位置，且异相物质不易上浮，并可能被钢液初始凝固壳前沿所捕获，从而造成连铸坯表面或皮下缺陷。 The downward flow of the molten steel has a large penetration depth, and the heterogeneous substances such as inclusions and bubbles in the molten steel are brought to a deep position of the crystallizer, and the heterogeneous substance is not easy to float, and may be initially solidified by the molten steel. Captured at the leading edge of the shell, causing surface or subcutaneous defects in the slab.
另外，从浸入式水口流出的钢液对结晶器内初始凝固坯壳产生冲击，还会导致初始凝固坯壳减薄或不均匀，容易造成漏钢事故。 In addition, the molten steel flowing out from the immersion nozzle exerts an impact on the initially solidified shell in the crystallizer, which also causes the initial solidified shell to be thinned or uneven, which is liable to cause a steel leakage accident.
为了解决上述问题，技术人员通常会在结晶器宽面水平方向加装电磁制动器，通过电磁制动器使结晶器内形成稳态磁场，结晶器内流动的钢液在通过稳态磁场时，将受到与钢液流动方向相反的电磁力，从而实现控制结晶器内钢液的流动目的。 In order to solve the above problems, the technician usually installs an electromagnetic brake in the horizontal direction of the wide surface of the crystallizer, and a static magnetic field is formed in the crystallizer by the electromagnetic brake, and the molten steel flowing in the crystallizer is subjected to a steady magnetic field. The molten metal flows in the opposite direction of the electromagnetic force, thereby achieving the purpose of controlling the flow of molten steel in the mold.
目前，用于产生稳态磁场的电磁制动器主要包括区域性电磁制动装置、全幅一段电磁制动装置及全幅二段电磁制动装置。 At present, the electromagnetic brakes for generating a steady-state magnetic field mainly include a regional electromagnetic brake device, a full-width one-stage electromagnetic brake device, and a full-width two-stage electromagnetic brake device.
关于区域性电磁制动装置，其可以产生作用于结晶器水口侧孔出流区域的稳态磁场，进而起到控制浸入式水口流出钢液流动的作用，但是，其所产生的稳态磁场的作用区域有限，不能对整个结晶器内的钢液流动进行有效的控制 ，而且容易产生沟道等其他缺陷。 Regarding the regional electromagnetic brake device, it can generate a steady-state magnetic field acting on the outflow region of the side hole of the crystallizer nozzle, thereby controlling the flow of the molten steel flowing out of the immersion nozzle, but the steady-state magnetic field generated by the same Limited action area, can not effectively control the flow of molten steel in the entire mold And it is easy to generate other defects such as channels.
关于全幅一段电磁制动装置（例如申请号为98810685.X的中国专利申请），其通过布置于浸入式水口下方并覆盖结晶器整个宽面的一对水平磁极产生稳态磁场，进而起到控制结晶器整个宽面的下返流钢液的冲击深度，但是，其对结晶器内上返流钢液对钢液表面的波动及卷渣缺乏有效的控制。 Regarding the full-width one-stage electromagnetic brake device (for example, Chinese Patent Application No. 98810685.X), which generates a steady-state magnetic field by a pair of horizontal magnetic poles disposed under the immersion nozzle and covering the entire wide surface of the crystallizer, thereby controlling The depth of impact of the molten steel under the entire wide surface of the crystallizer, however, it does not effectively control the fluctuation of the molten steel on the surface of the molten steel in the crystallizer and the slag.
关于全幅二段电磁制动装置（例如申请号为98801009.7的中国专利申请），其通过布置于结晶器钢液表面区域的一对水平磁极和位于浸入式水口下方的一对水平磁极产生稳态磁场，进而起到控制结晶器钢液表面波动和钢液冲击深度的作用，但是，为了使结晶器侧面弯月面处的钢液表面波动得到有效控制，结晶器钢液表面区域的一对水平磁极往往需要施加足够大的磁场强度，这反而容易造成结晶器大部分区域的钢液表面流速过低，从而显著降低了钢液与保护渣的热交换，并不利于保护渣的熔化和夹杂物的吸附。 Regarding a full-width two-stage electromagnetic brake device (for example, Chinese Patent Application No. 98801009.7), a steady magnetic field is generated by a pair of horizontal magnetic poles disposed in a surface area of a molten steel of a crystallizer and a pair of horizontal magnetic poles located below the submerged nozzle. , in turn, to control the surface fluctuation of the molten steel of the crystallizer and the impact depth of the molten steel, but in order to effectively control the surface fluctuation of the molten steel at the meniscus on the side of the crystallizer, a pair of horizontal magnetic poles in the surface area of the molten steel of the crystallizer It is often necessary to apply a sufficiently large magnetic field strength, which in turn tends to cause the surface velocity of the molten steel in most areas of the crystallizer to be too low, thereby significantly reducing the heat exchange between the molten steel and the protective slag, and is not conducive to the melting of the slag and the inclusions. Adsorption.
另外，对于全幅一段电磁制动装置和全幅二段电磁制动装置，二者的水平磁极在高度方向的位置均不可调节，在连铸生产过程中，当水口浸入深度、水口出流角度、液面高度和拉速等工艺参数发生变化时，水平磁极与工艺参数的匹配关系也会发生多种变化，无法始终保持合理的、最佳的匹配关系，这会严重影响到电磁制动的冶金效果，甚至抑制夹杂物、气泡等异相物质上浮的不良作用。 In addition, for the full-width one-stage electromagnetic brake device and the full-width two-stage electromagnetic brake device, the horizontal magnetic poles of the two can not be adjusted in the height direction. In the continuous casting production process, when the nozzle is immersed in the depth, the nozzle outlet angle, the liquid When the process parameters such as surface height and pulling speed change, the matching relationship between horizontal magnetic pole and process parameters will also undergo various changes, and it is impossible to maintain a reasonable and optimal matching relationship at all times, which will seriously affect the metallurgical effect of electromagnetic braking. It even suppresses the adverse effects of the floating of heterogeneous substances such as inclusions and bubbles.
专利号为200810011104.7的中国专利也公开了一种电磁制动装置，其在结晶器两侧面附近且沿结晶器高度方向上布置有两对立式磁极，立式磁极覆盖结晶器侧面附近的钢液表面区域 和 水口出流冲击区域并产生稳态磁场，通过两对立式磁极产生的稳态磁场，控制结晶器弯月面附近的钢液表面波动和水口出流冲击点区域的流动，该电磁制动装置对结晶器侧面附近区域的制动效果受连铸工艺参数变化的影响较小。但是，该电磁制动装置是由两个半环绕于结晶器侧面的磁轭、磁极和励磁线圈组成。立式磁极在结晶器宽面方向的宽度有限，当结晶器幅宽较大时，在结晶器中心区域的稳态磁场强度较弱，不能有效控制结晶器中心区域下返流钢液的冲击深度，因此不利于夹杂物、气泡等异相物质的上浮。 The Chinese patent No. 200810011104.7 also discloses an electromagnetic brake device in which two pairs of vertical magnetic poles are arranged in the vicinity of both sides of the crystallizer and along the height direction of the crystallizer, and the vertical magnetic pole covers the molten steel near the side of the crystallizer. Surface area with The nozzle exits the impact region and generates a steady-state magnetic field, and the steady-state magnetic field generated by the two pairs of vertical magnetic poles controls the surface fluctuation of the molten steel near the meniscus of the crystallizer and the flow of the outlet point of the nozzle, the electromagnetic brake device The braking effect on the area near the side of the mold is less affected by changes in the parameters of the continuous casting process. However, the electromagnetic brake device is composed of two yokes, a magnetic pole and an exciting coil that surround the side of the crystallizer. The width of the vertical magnetic pole in the wide direction of the crystallizer is limited. When the width of the crystallizer is large, the steady magnetic field strength in the central region of the crystallizer is weak, and the impact depth of the returning molten steel in the central region of the crystallizer cannot be effectively controlled. Therefore, it is not conducive to the floating of heterogeneous substances such as inclusions and bubbles.
发明内容 Summary of the invention
针对现有技术存在的问题，本发明提供一种全新改进设计的控制连铸结晶器内钢液流动的立式电磁制动装置，在优先抑制 水口出流钢液对结晶器侧面的冲击以及弯月面处钢液表面流动的 同时，能够控制结晶器中心区域的钢液流动，避免结晶器中心区域的钢液表面流速过低和向下钢液流动冲击过深的情况出现，以抑制钢液表面的波动和卷渣，促进夹杂物、气泡等异相物质的上浮。而且，使其电磁制动的冶金效果受工艺参数变化的影响较小， In view of the problems existing in the prior art, the present invention provides a completely improved design of a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, which is preferentially suppressed. The impact of the molten steel flowing out of the nozzle on the side of the crystallizer and the surface of the molten steel at the meniscus At the same time, it can control the flow of molten steel in the central region of the crystallizer, avoiding the low flow rate of the molten steel surface in the central region of the crystallizer and the excessive impact of the downward molten steel flow, so as to inhibit the fluctuation of the molten steel surface and the slag rolling, and promote The floating matter of foreign matter such as inclusions and bubbles. Moreover, the metallurgical effect of its electromagnetic braking is less affected by changes in process parameters.
为了实现上述目的，本发明采用如下技术方案：一种控制连铸结晶器内钢液流动的立式电磁制动装置，包括水平磁极、励磁线圈、立式磁极及磁轭；所述水平磁极设有一对，立式磁极设有两对；一对所述水平磁极位于侵入式水口下方且沿结晶器宽面布置，两对所述立式磁极分别布置于结晶器两侧面区域附近，两对立式磁极与一对水平磁极相交汇；所述励磁线圈及磁轭均与水平磁极相配装，通过励磁线圈施加电流，在水平磁极与立式磁极之间产生稳态磁场，结晶器内流动的钢液通过稳态磁场时受到与钢液流动方向相反的电磁力，通过电磁力控制结晶器内钢液的流动。 In order to achieve the above object, the present invention adopts the following technical solution: a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, comprising a horizontal magnetic pole, an exciting coil, a vertical magnetic pole and a yoke; There is a pair, the vertical magnetic pole is provided with two pairs; a pair of the horizontal magnetic poles are located below the intrusive nozzle and arranged along the wide surface of the crystallizer, two pairs of the vertical magnetic poles are respectively arranged near the two side regions of the crystallizer, two opposite The magnetic pole and the pair of horizontal magnetic poles meet; the exciting coil and the yoke are matched with the horizontal magnetic pole, and a current is applied through the exciting coil to generate a steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole, and the steel flowing in the crystallizer When the liquid passes through the steady-state magnetic field, it receives an electromagnetic force opposite to the flow direction of the molten steel, and the electromagnetic force controls the flow of the molten steel in the crystallizer.
一种控制连铸结晶器内钢液流动的立式电磁制动装置，包括水平磁极、励磁线圈、立式磁极及磁轭；所述水平磁极和立式磁极均设有两对；一对所述水平磁极位于侵入式水口下方且沿结晶器宽面布置，并记为下部水平磁极；另一对所述水平磁极位于结晶器内钢液表面附近且沿结晶器宽面布置，并记为上部水平磁极；两对所述立式磁极分别布置于结晶器两侧面区域附近，两对立式磁极与两对水平磁极相交汇；所述励磁线圈及磁轭均与水平磁极相配装，通过励磁线圈施加电流，在水平磁极与立式磁极之间产生稳态磁场，结晶器内流动的钢液通过稳态磁场时受到与钢液流动方向相反的电磁力，通过电磁力控制结晶器内钢液的流动。 A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, comprising a horizontal magnetic pole, an excitation coil, a vertical magnetic pole and a yoke; the horizontal magnetic pole and the vertical magnetic pole are respectively provided with two pairs; The horizontal magnetic pole is located below the intrusive nozzle and arranged along the wide surface of the crystallizer and is recorded as the lower horizontal magnetic pole; the other pair of horizontal magnetic poles are located near the surface of the molten steel in the crystallizer and are arranged along the wide surface of the crystallizer, and are recorded as the upper part. a horizontal magnetic pole; two pairs of the vertical magnetic poles are respectively disposed near two side regions of the crystallizer, and two pairs of vertical magnetic poles intersect with two pairs of horizontal magnetic poles; the excitation coil and the yoke are matched with the horizontal magnetic poles, and the excitation coils are passed through the excitation coils When a current is applied, a steady magnetic field is generated between the horizontal magnetic pole and the vertical magnetic pole, and the molten steel flowing in the crystallizer receives an electromagnetic force opposite to the flow direction of the molten steel when passing through the steady magnetic field, and controls the molten steel in the crystallizer by the electromagnetic force. flow.
两对所述立式磁极与一对水平磁极在交汇处的连接方式为： The connection between two pairs of the vertical magnetic pole and a pair of horizontal magnetic poles at the intersection is:
① 立式磁极垂直镶嵌在水平磁极上； 1 The vertical magnetic pole is vertically mounted on the horizontal magnetic pole;
② 立式磁极分别在水平磁极的上表面和下表面与水平磁极垂直连接； 2 The vertical magnetic poles are perpendicularly connected to the horizontal magnetic poles on the upper surface and the lower surface of the horizontal magnetic pole, respectively;
③ 立式磁极仅在水平磁极的上表面与水平磁极垂直连接； 3 The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the horizontal magnetic pole;
④ 立式磁极仅在水平磁极的下表面与水平磁极垂直连接。 4 The vertical pole is connected perpendicularly to the horizontal pole only on the lower surface of the horizontal pole.
两对所述立式磁极与两对水平磁极在交汇处的连接方式为： The connection between two pairs of said vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection is:
① 立式磁极分别垂直镶嵌在上部水平磁极和下部水平磁极上； 1 vertical magnetic poles are vertically embedded in the upper horizontal magnetic pole and the lower horizontal magnetic pole;
② 立式 磁极仅垂直镶嵌在下部水平磁极上； 2 vertical magnetic poles are only vertically mounted on the lower horizontal magnetic pole;
③ 立式磁极仅垂直镶嵌在上部水平磁极上； 3 The vertical magnetic pole is only vertically mounted on the upper horizontal magnetic pole;
④ 立式磁极垂直镶嵌在上部水平磁极上，且立式磁极在下部水平磁极的下表面 与水平磁极垂直连接； 4 The vertical magnetic pole is vertically embedded on the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole;
⑤ 立式磁极分别在下部水平磁极的上表面和下表面与水平磁极垂直连接； 5 vertical magnetic poles are vertically connected to the horizontal magnetic poles on the upper surface and the lower surface of the lower horizontal magnetic pole;
⑥ 立式磁极仅在下部水平磁极的上表面与水平磁极垂直连接； 6 The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the lower horizontal magnetic pole;
⑦ 立式磁极在上部水平磁极的下表面与水平磁极垂直连接，且立式磁极在下部水平磁极的下表面与水平磁极垂直连接； 7 The vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole on the lower surface of the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole;
⑧ 立式磁极仅在上部水平磁极的下表面与水平磁极垂直连接。 8 The vertical pole is connected perpendicularly to the horizontal pole only on the lower surface of the upper horizontal pole.
所述立式磁极的高度要求为覆盖自结晶器内钢液表面上方100mm并向下延伸1000mm的区域。 The height of the vertical pole is required to cover an area 100 mm above the surface of the molten steel in the crystallizer and extending 1000 mm downward.
所述立式磁极的宽度范围为50mm～400mm。 The vertical magnetic pole has a width ranging from 50 mm to 400 mm.
所述水平磁极与立式磁极之间稳态磁场的磁感应强度为0.01T～3T。 The magnetic induction intensity of the steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole is 0.01T to 3T.
根据结晶器宽度的调节变化以及控制钢液流动的实际需要，在结晶器宽度方向上，所述立式磁极与水平磁极的结合位置进行自由选定。 According to the adjustment of the width of the crystallizer and the actual need to control the flow of molten steel, the combined position of the vertical magnetic pole and the horizontal magnetic pole is freely selected in the direction of the width of the crystallizer.
本发明的有益效果： The beneficial effects of the invention:
本发明的立式磁极不用设置励磁线圈，其能够以不同的连接方式与水平磁极相结合，仅利用水平磁极上的励磁线圈在水平磁极与立式磁极之间产生稳态磁场。 The vertical magnetic pole of the present invention does not need to be provided with an exciting coil, which can be combined with the horizontal magnetic pole in different connection manners, and only uses the exciting coil on the horizontal magnetic pole to generate a steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole.
本发明采用两对立式磁极与一对水平磁极或两对水平磁极相交汇的方式产生稳态磁场，沿结晶器高度方向，通过两对立式磁极可覆盖结晶器两侧面附近的钢液表面和初始凝固坯壳前沿区域，可以控制结晶器侧面附近从钢液表面到水口出流冲击区域以及水平磁极下方的钢液流动区域，使水口出流钢液在冲击结晶器侧面之前就受到磁场的抑制，减弱其对结晶器侧面的冲击和钢液表面的扰动，以控制结晶器侧面弯月面区域的钢液波动与卷渣，降低初始凝固坯壳对夹杂物和气泡的捕获，进而提高连铸坯的质量。 The invention adopts two pairs of vertical magnetic poles to form a steady magnetic field by means of a pair of horizontal magnetic poles or two pairs of horizontal magnetic poles. The two pairs of vertical magnetic poles can cover the molten steel surface near the two sides of the crystallizer along the height direction of the crystallizer. And the initial solidified shell front region can control the molten steel flow region from the molten steel surface to the nozzle outlet and the horizontal magnetic pole near the side of the crystallizer, so that the outlet molten steel receives the magnetic field before impacting the side of the crystallizer. Suppresses and weakens the impact on the side of the mold and the disturbance of the molten steel surface to control the fluctuation of molten steel and the slag in the meniscus area of the crystallizer, reducing the capture of inclusions and bubbles by the initial solidified shell, thereby improving the joint The quality of the slab.
本发明的立式磁极的高度要求为覆盖自结晶器内钢液表面上方100mm并向下延伸1000mm的区域，即满足覆盖自结晶器侧面附近的钢液表面上方到浸入式水口下方的一定深度区域，在连铸生产过程中，即使水口浸入深度、水口出流角度、液面高度和拉速等工艺参数发生变化时，结晶器侧面附近的钢液流动始终在立式磁极所覆盖的区域内，因此，能够依然有效地控制结晶器侧面附近的钢液表面波动及钢液冲击深度，使其制动效果受工艺参数变化的影响较小。 The height requirement of the vertical magnetic pole of the present invention is to cover a region 100 mm above the surface of the molten steel in the crystallizer and extending downward by 1000 mm, that is, to cover a certain depth region from above the surface of the molten steel near the side of the crystallizer to below the immersion nozzle. In the continuous casting production process, even if the process parameters such as nozzle immersion depth, nozzle outlet angle, liquid level height and drawing speed change, the molten steel flow near the side of the crystallizer is always in the area covered by the vertical magnetic pole. Therefore, it is possible to effectively control the surface fluctuation of the molten steel near the side of the crystallizer and the impact depth of the molten steel, so that the braking effect is less affected by the variation of the process parameters.
当本发明采用两对立式磁极与一对水平磁极相交汇的方式产生稳态磁场时，通过结晶器宽面布置的水平磁极来控制结晶器中心区域的钢液向下流动，降低钢液的冲击深度，实现了促进夹杂物和气泡上浮的目的。 When the present invention uses two pairs of vertical magnetic poles to intersect a pair of horizontal magnetic poles to generate a steady-state magnetic field, the horizontal magnetic poles arranged by the wide surface of the crystallizer control the downward flow of the molten steel in the central portion of the crystallizer, and reduce the molten steel. The impact depth achieves the purpose of promoting inclusions and bubbles floating.
当本发明采用两对立式磁极与两对水平磁极相交汇的方式产生稳态磁场时，立式磁极可以与位于结晶器钢液表面附近的一对水平磁极配合使用，在选定了一种立式磁极与水平磁极的连接方式后，可通过增加立式磁极的磁场强度来控制结晶器侧面弯月面处的流动，防止弯月面处钢液表面的波动及卷渣；同时，相对地减弱上部水平磁极的磁场强度，或者上部水平磁极不施加电流，在适当地控制结晶器内中心区域钢液表面波动的情况下，可使钢液表面依然保持一定的流速和热交换能力，进而有利于保护渣的熔化和吸附夹杂物，从而获得良好的电磁制动效果。 When the present invention uses two pairs of vertical magnetic poles to form a steady state magnetic field in a manner of intersection of two pairs of horizontal magnetic poles, the vertical magnetic pole can be used in combination with a pair of horizontal magnetic poles located near the surface of the molten steel of the crystallizer, and one type is selected. After the connection between the vertical magnetic pole and the horizontal magnetic pole, the magnetic field strength of the vertical magnetic pole can be increased to control the flow at the meniscus on the side of the crystallizer, and the fluctuation of the molten steel surface at the meniscus and the slag rolling can be prevented; meanwhile, relatively Attenuating the magnetic field strength of the upper horizontal magnetic pole, or applying no current to the upper horizontal magnetic pole, and maintaining proper flow velocity and heat exchange capacity of the molten steel surface while appropriately controlling the fluctuation of the molten steel surface in the central region of the crystallizer, It is good for the melting of the slag and the adsorption of inclusions, so as to obtain a good electromagnetic braking effect.
附图说明 DRAWINGS
图1为本发明的一种控制连铸结晶器内钢液流动的立式电磁制动装置（设有一对水平磁极）结构示意图； 1 is a schematic structural view of a vertical electromagnetic brake device (provided with a pair of horizontal magnetic poles) for controlling the flow of molten steel in a continuous casting mold according to the present invention;
图2为图1中的立式电磁制动装置的结晶器内钢液流动与磁极布置示意图； 2 is a schematic view showing the flow of molten steel and the arrangement of magnetic poles in the crystallizer of the vertical electromagnetic brake device of FIG. 1;
图3(a)为图1中的立式电磁制动装置的两对立式磁极与一对水平磁极在交汇处的连接方式示意图（立式磁极垂直镶嵌在水平磁极上）； Figure 3 (a) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 1 (the vertical magnetic pole is vertically embedded on the horizontal magnetic pole);
图3(b)为图1中的立式电磁制动装置的两对立式磁极与一对水平磁极在交汇处的连接方式示意图（立式磁极分别在水平磁极的上表面和下表面与水平磁极垂直连接）； Figure 3 (b) is a schematic view showing the connection of two pairs of vertical magnetic poles and a pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 1 (the vertical magnetic poles are respectively on the upper and lower surfaces of the horizontal magnetic pole and horizontally Magnetic pole vertical connection);
图3(c)为图1中的立式电磁制动装置的两对立式磁极与一对水平磁极在交汇处的连接方式示意图（立式磁极仅在水平磁极的上表面与水平磁极垂直连接）； 3(c) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of FIG. 1 (the vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole only on the upper surface of the horizontal magnetic pole) );
图3(d)为图1中的立式电磁制动装置的两对立式磁极与一对水平磁极在交汇处的连接方式示意图（立式磁极仅在水平磁极的下表面与水平磁极垂直连接）； Figure 3 (d) is a schematic view showing the connection of two pairs of vertical magnetic poles and a pair of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 1 (the vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole only on the lower surface of the horizontal magnetic pole) );
图4为本发明的一种控制连铸结晶器内钢液流动的立式电磁制动装置（设有两对水平磁极）结构示意图； 4 is a schematic structural view of a vertical electromagnetic brake device (with two pairs of horizontal magnetic poles) for controlling the flow of molten steel in a continuous casting mold according to the present invention;
图5(a)为图4中的立式电磁制动装置的结晶器内钢液流动与磁极布置示意图（结晶器宽面方向）； Figure 5 (a) is a schematic view showing the flow of molten steel and the arrangement of the magnetic poles in the crystallizer of the vertical electromagnetic brake device of Figure 4 (the direction of the wide side of the crystallizer);
图5(b)为图4中的立式电磁制动装置的结晶器内钢液流动与磁极布置示意图（结晶器窄面方向）； Figure 5 (b) is a schematic view showing the flow of molten steel and the arrangement of the magnetic poles in the crystallizer of the vertical electromagnetic brake device of Figure 4 (the direction of the narrow side of the crystallizer);
图6(a) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式磁极分别垂直镶嵌在上部水平磁极和下部水平磁极上 ）； Figure 6 (a) is a schematic view showing the connection mode of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic poles are vertically embedded in the upper horizontal magnetic pole and the lower horizontal magnetic pole respectively;
图6(b) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式 磁极仅垂直镶嵌在下部水平磁极上 ）； Figure 6 (b) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 (vertical The magnetic pole is only vertically mounted on the lower horizontal magnetic pole);
图6(c) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式磁极仅垂直镶嵌在上部水平磁极上 ）； Figure 6 (c) is a schematic view showing the connection manner of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic pole is only vertically mounted on the upper horizontal magnetic pole);
图6(d) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式磁极垂直镶嵌在上部水平磁极上，且立式磁极在下部水平磁极的下表面 与水平磁极垂直连接）； Figure 6 (d) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic pole is vertically embedded on the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole);
图6(e) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式磁极分别在下部水平磁极的上表面和下表面与水平磁极垂直连接 ）； Figure 6 (e) is a schematic view showing the connection manner of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic poles are perpendicularly connected to the horizontal magnetic poles on the upper and lower surfaces of the lower horizontal magnetic poles respectively);
图6(f) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式磁极仅在下部水平磁极的上表面与水平磁极垂直连接 ）； Figure 6 (f) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the lower horizontal magnetic pole);
图6(g) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式磁极在上部水平磁极的下表面与水平磁极垂直连接，且立式磁极在下部水平磁极的下表面与水平磁极垂直连接 ）； Figure 6 (g) is a schematic view showing the connection mode of the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole on the lower surface of the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole);
图6(h) 为图4中的立式电磁制动装置的两对立式磁极与两对水平磁极在交汇处的连接方式示意图（ 立式磁极仅在上部水平磁极的下表面与水平磁极垂直连接 ）； Figure 6 (h) is a schematic view showing the connection manner of two pairs of vertical magnetic poles and two pairs of horizontal magnetic poles at the intersection of the vertical electromagnetic brake device of Figure 4 ( The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the lower surface of the upper horizontal magnetic pole);
图7为结晶器侧面中心截面的立式磁极中心沿高度方向的磁场分布图（采用图1中的立式电磁制动装置）； Figure 7 is a magnetic field distribution diagram of the center of the vertical magnetic pole of the central section of the crystallizer along the height direction (using the vertical electromagnetic brake device of Figure 1);
图8(a)为无电磁制动条件下的结晶器侧面附近金属液的液面波动情况图（采用图1中的立式电磁制动装置）； Figure 8 (a) is a diagram showing the fluctuation of the liquid level of the molten metal near the side of the crystallizer without electromagnetic braking (using the vertical electromagnetic brake device of Figure 1);
图8(b)为有电磁制动条件下的结晶器侧面附近金属液的液面波动情况图（采用图1中的立式电磁制动装置）； Figure 8 (b) is a diagram showing the fluctuation of the liquid level of the molten metal near the side of the crystallizer under electromagnetic braking conditions (using the vertical electromagnetic brake device of Figure 1);
图9为在施加850A电流时的结晶器内钢液内部磁场分布图（采用图1中的立式电磁制动装置）； Figure 9 is a diagram showing the internal magnetic field distribution of the molten steel in the crystallizer when a current of 850 A is applied (using the vertical electromagnetic brake device of Fig. 1);
图10(a)为无电磁制动条件下的结晶器侧面中心截面的钢液流场分布图（采用图1中的立式电磁制动装置）； Figure 10 (a) is a flow diagram of the flow of molten steel in the central section of the side of the mold without electromagnetic braking (using the vertical electromagnetic brake device of Figure 1);
图10(b)为有电磁制动条件下的结晶器侧面中心截面的钢液流场分布图（采用图1中的立式电磁制动装置）； Figure 10 (b) is a flow diagram of the flow of molten steel in the central section of the side of the crystallizer under electromagnetic braking conditions (using the vertical electromagnetic brake device of Figure 1);
图11为有/无电磁制动条件下的结晶器侧面中心截面的钢液表面流速分布图（采用图1中的立式电磁制动装置）； Figure 11 is a flow chart showing the flow velocity of the molten steel surface at the center section of the side of the crystallizer with or without electromagnetic braking (using the vertical electromagnetic brake device of Fig. 1);
图中，1-水平磁极，2-励磁线圈，3-立式磁极，4-侵入式水口，5-磁轭，6-钢液表面，7-结晶器，8-凝固坯壳。 In the figure, 1-horizontal magnetic pole, 2-exciting coil, 3-vertical magnetic pole, 4-invasive nozzle, 5-yoke, 6-steel surface, 7-crystallizer, 8-solid billet shell.
具体实施方式 detailed description
下面结合附图和具体实施例对本发明做进一步的详细说明。 The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
如图1、2所示，一种控制连铸结晶器内钢液流动的立式电磁制动装置，包括水平磁极1、励磁线圈2、立式磁极3及磁轭5；所述水平磁极1设有一对，立式磁极3设有两对；一对所述水平磁极1位于侵入式水口4下方且沿结晶器7宽面布置，两对所述立式磁极3分别布置于结晶器7两侧面区域附近，两对立式磁极3与一对水平磁极1相交汇；所述励磁线圈2及磁轭5均与水平磁极1相配装，通过励磁线圈2施加电流，在水平磁极1与立式磁极3之间产生稳态磁场，结晶器7内流动的钢液通过稳态磁场时受到与钢液流动方向相反的电磁力，通过电磁力控制结晶器7内钢液的流动。 As shown in FIGS. 1 and 2, a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold includes a horizontal magnetic pole 1, an exciting coil 2, a vertical magnetic pole 3, and a yoke 5; the horizontal magnetic pole 1 A pair is provided, and the vertical magnetic pole 3 is provided with two pairs; a pair of the horizontal magnetic poles 1 are located below the intrusive nozzle 4 and are arranged along the wide surface of the crystallizer 7, and two pairs of the vertical magnetic poles 3 are respectively arranged in the crystallizer 7 In the vicinity of the side area, the two pairs of vertical magnetic poles 3 and the pair of horizontal magnetic poles 1 meet; the exciting coil 2 and the yoke 5 are all fitted with the horizontal magnetic pole 1, and current is applied through the exciting coil 2, and the horizontal magnetic pole 1 and the vertical type A steady-state magnetic field is generated between the magnetic poles 3, and the molten steel flowing in the crystallizer 7 receives an electromagnetic force opposite to the flow direction of the molten steel when passing through the steady-state magnetic field, and the flow of the molten steel in the crystallizer 7 is controlled by the electromagnetic force.
如图4、5(a)、5(b)所示，一种控制连铸结晶器内钢液流动的立式电磁制动装置，包括水平磁极1、励磁线圈2、立式磁极3及磁轭5；所述水平磁极1和立式磁极3均设有两对；一对所述水平磁极1位于侵入式水口4下方且沿结晶器7宽面布置，并记为下部水平磁极1；另一对所述水平磁极1位于结晶器7内钢液表面6附近且沿结晶器7宽面布置，并记为上部水平磁极1；两对所述立式磁极3分别布置于结晶器7两侧面区域附近，两对立式磁极3与两对水平磁极1相交汇；所述励磁线圈2及磁轭5均与水平磁极1相配装，通过励磁线圈2施加电流，在水平磁极1与立式磁极3之间产生稳态磁场，结晶器7内流动的钢液通过稳态磁场时受到与钢液流动方向相反的电磁力，通过电磁力控制结晶器7内钢液的流动。 As shown in Figures 4, 5(a) and 5(b), a vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, comprising a horizontal magnetic pole 1, an exciting coil 2, a vertical magnetic pole 3, and a magnetic body a yoke 5; the horizontal magnetic pole 1 and the vertical magnetic pole 3 are respectively provided with two pairs; a pair of the horizontal magnetic poles 1 are located below the intrusive nozzle 4 and are arranged along the wide surface of the crystallizer 7 and are recorded as the lower horizontal magnetic pole 1; A pair of said horizontal magnetic poles 1 are located near the molten steel surface 6 in the crystallizer 7 and are arranged along the wide surface of the crystallizer 7 and are referred to as upper horizontal magnetic poles 1; two pairs of said vertical magnetic poles 3 are respectively arranged on both sides of the crystallizer 7 In the vicinity of the region, two pairs of vertical magnetic poles 3 and two pairs of horizontal magnetic poles 1 meet; the exciting coil 2 and the yoke 5 are matched with the horizontal magnetic pole 1, and a current is applied through the exciting coil 2, and the horizontal magnetic pole 1 and the vertical magnetic pole A steady-state magnetic field is generated between the three, and the molten steel flowing in the crystallizer 7 receives an electromagnetic force opposite to the flow direction of the molten steel when passing through the steady-state magnetic field, and controls the flow of the molten steel in the crystallizer 7 by the electromagnetic force.
如图3(a)～3(d)所示，两对所述立式磁极3与一对水平磁极1在交汇处的连接方式为： As shown in FIGS. 3(a) to 3(d), the connection manner of the two pairs of the vertical magnetic pole 3 and the pair of horizontal magnetic poles 1 at the intersection is as follows:
① 立式磁极3垂直镶嵌在水平磁极1上； 1 vertical magnetic pole 3 is vertically mounted on the horizontal magnetic pole 1;
② 立式磁极3分别在水平磁极1的上表面和下表面与水平磁极1垂直连接； 2 the vertical magnetic poles 3 are vertically connected to the horizontal magnetic pole 1 on the upper surface and the lower surface of the horizontal magnetic pole 1, respectively;
③ 立式磁极3仅在水平磁极1的上表面与水平磁极1垂直连接； 3 The vertical magnetic pole 3 is perpendicularly connected to the horizontal magnetic pole 1 only on the upper surface of the horizontal magnetic pole 1;
④ 立式磁极3仅在水平磁极1的下表面与水平磁极1垂直连接。 4 The vertical magnetic pole 3 is vertically connected to the horizontal magnetic pole 1 only on the lower surface of the horizontal magnetic pole 1.
如图6(a)～6(h)所示，两对所述立式磁极3与两对水平磁极1在交汇处的连接方式为： As shown in Figures 6(a) to 6(h), the two pairs of the vertical magnetic poles 3 and the two pairs of horizontal magnetic poles 1 are connected at the intersection:
① 立式磁极3分别垂直镶嵌在上部水平磁极1和下部水平磁极1上； 1 vertical magnetic poles 3 are vertically embedded in the upper horizontal magnetic pole 1 and the lower horizontal magnetic pole 1 respectively;
② 立式 磁极3仅垂直镶嵌在下部水平磁极1上； 2 vertical magnetic pole 3 is only vertically embedded in the lower horizontal magnetic pole 1;
③ 立式磁极3仅垂直镶嵌在上部水平磁极1上； 3 The vertical magnetic pole 3 is only vertically embedded on the upper horizontal magnetic pole 1;
④ 立式磁极3垂直镶嵌在上部水平磁极1上，且立式磁极3在下部水平磁极1的下表面 与水平磁极1垂直连接； 4 The vertical magnetic pole 3 is vertically mounted on the upper horizontal magnetic pole 1, and the vertical magnetic pole 3 is on the lower surface of the lower horizontal magnetic pole 1 Vertically connected to the horizontal magnetic pole 1;
⑤ 立式磁极3分别在下部水平磁极1的上表面和下表面与水平磁极1垂直连接； 5 vertical magnetic poles 3 are vertically connected to the horizontal magnetic pole 1 on the upper surface and the lower surface of the lower horizontal magnetic pole 1, respectively;
⑥ 立式磁极3仅在下部水平磁极1的上表面与水平磁极1垂直连接； 6 The vertical magnetic pole 3 is perpendicularly connected to the horizontal magnetic pole 1 only on the upper surface of the lower horizontal magnetic pole 1;
⑦ 立式磁极3在上部水平磁极1的下表面与水平磁极1垂直连接，且立式磁极3在下部水平磁极1的下表面与水平磁极1垂直连接； 7 The vertical magnetic pole 3 is perpendicularly connected to the horizontal magnetic pole 1 on the lower surface of the upper horizontal magnetic pole 1, and the vertical magnetic pole 3 is vertically connected to the horizontal magnetic pole 1 on the lower surface of the lower horizontal magnetic pole 1;
⑧ 立式磁极3仅在上部水平磁极1的下表面与水平磁极1垂直连接。 The vertical magnetic pole 3 is vertically connected to the horizontal magnetic pole 1 only on the lower surface of the upper horizontal magnetic pole 1.
所述立式磁极3的高度要求为覆盖自结晶器7内钢液表面6上方100mm并向下延伸1000mm的区域。 The height of the vertical magnetic pole 3 is required to cover an area 100 mm above the molten steel surface 6 in the crystallizer 7 and extending downward by 1000 mm.
所述立式磁极3的宽度范围为50mm～400mm。 The width of the vertical magnetic pole 3 ranges from 50 mm to 400 mm.
所述水平磁极1与立式磁极3之间稳态磁场的磁感应强度为0.01T～3T。 The magnetic induction intensity of the steady magnetic field between the horizontal magnetic pole 1 and the vertical magnetic pole 3 is 0.01T to 3T.
根据结晶器7宽度的调节变化以及控制钢液流动的实际需要，在结晶器7宽度方向上，所述立式磁极3与水平磁极1的结合位置进行自由选定。 The bonding position of the vertical magnetic pole 3 and the horizontal magnetic pole 1 is freely selected in the width direction of the crystallizer 7 in accordance with the adjustment of the width of the crystallizer 7 and the actual need to control the flow of the molten steel.
实施例一 Embodiment 1
本实施例中，采用图1所示的立式电磁制动装置，立式磁极3与水平磁极1采用图3(a)的连接方式，立式磁极3在高度上覆盖结晶器7侧面自钢液表面6区域到侵入式水口4出流钢液的冲击点及水平磁极1下方区域，结晶器7的截面尺寸为300mm×50mm，立式磁极3的高度为240mm。 In this embodiment, the vertical electromagnetic brake device shown in FIG. 1 is adopted, and the vertical magnetic pole 3 and the horizontal magnetic pole 1 are connected by the connection of FIG. 3(a), and the vertical magnetic pole 3 covers the side of the crystallizer 7 from the steel in height. From the liquid surface 6 region to the impact point of the inflowing molten metal 4 and the lower portion of the horizontal magnetic pole 1, the cross-sectional dimension of the crystallizer 7 is 300 mm × 50 mm, and the height of the vertical magnetic pole 3 is 240 mm.
在水平磁极1的励磁线圈2上分别施加700A和1050A的电流，而结晶器侧面中心截面的立式磁极中心沿高度方向的磁场分布图，如图7所示。 A current of 700 A and 1050 A is applied to the exciting coil 2 of the horizontal magnetic pole 1, and a magnetic field distribution of the center of the vertical magnetic pole of the central section of the crystallizer in the height direction is shown in FIG.
由图7可见，随着电流强度增加，磁感应强度逐渐增加，在水平磁极1覆盖区域的中心达最大；当施加的电流由700A增加到1050A时，水平磁极1中心的最大磁感应强度由0.46T增加到0.52T；而在立式磁极3的上端和下端，即结晶器7钢液表面6附近和水平磁极1下方，其磁感应强度在0.21T至0.25T。因此，说明立式磁极3在不设置励磁线圈2的情况下，通过立式磁极3与水平磁极1的连接，利用水平磁极1的励磁线圈2就能够在立式磁极2所覆盖的区域产生较强的磁场，从而实现了控制结晶器7内钢液流动的目的。 It can be seen from Fig. 7 that as the current intensity increases, the magnetic induction intensity gradually increases, reaching the maximum at the center of the horizontal magnetic pole 1 coverage area; when the applied current is increased from 700A to 1050A, the maximum magnetic induction intensity at the center of the horizontal magnetic pole 1 is increased by 0.46T. Up to 0.52T; and at the upper and lower ends of the vertical magnetic pole 3, that is, near the molten steel surface 6 of the crystallizer 7 and below the horizontal magnetic pole 1, the magnetic induction intensity is 0.21T to 0.25T. Therefore, when the vertical magnetic pole 3 is not provided with the exciting coil 2, the connection between the vertical magnetic pole 3 and the horizontal magnetic pole 1 can be made in the region covered by the vertical magnetic pole 2 by the exciting coil 2 of the horizontal magnetic pole 1. The strong magnetic field achieves the purpose of controlling the flow of molten steel in the crystallizer 7.
实施例二 Embodiment 2
本实施例中，采用图1所示的立式电磁制动装置，为了更加直观的观察结晶器7内液面波动情况，测试对象选用低熔点合金SnPbBi的金属液；立式磁极3与水平磁极1采用图3(b)的连接方式，立式磁极3在高度上覆盖结晶器7侧面自钢液表面6区域到侵入式水口4出流钢液的冲击点及水平磁极1下方区域，结晶器7的厚度为100mm，结晶器7的半宽尺寸为600mm，立式磁极3的高度为440mm，侵入式水口4的侧孔倾角为-15°，侵入式水口4的侵入深度为100mm，其拉坯速度为1.27m/min。 In this embodiment, the vertical electromagnetic brake device shown in FIG. 1 is used. In order to more intuitively observe the fluctuation of the liquid surface in the crystallizer 7, the test object selects the molten metal of the low melting point alloy SnPbBi; the vertical magnetic pole 3 and the horizontal magnetic pole 1 using the connection mode of Fig. 3 (b), the vertical magnetic pole 3 covers the impact point of the molten steel surface from the molten steel surface 6 side to the inflowing nozzle 4 and the lower surface of the horizontal magnetic pole 1 in the height of the mold 7 The thickness of 7 is 100 mm, the half width of the crystallizer 7 is 600 mm, the height of the vertical magnetic pole 3 is 440 mm, the inclination of the side hole of the intrusive nozzle 4 is -15°, and the penetration depth of the intrusive nozzle 4 is 100 mm. The billet speed was 1.27 m/min.
在水平磁极1的励磁线圈2上施加电流，使位于一对立式磁极3中间的结晶器7内产生0.28T左右的磁场，而有/无电磁制动条件下的结晶器侧面附近金属液的液面波动情况图，如图8(a)、图8(b)所示。 A current is applied to the exciting coil 2 of the horizontal magnetic pole 1, so that a magnetic field of about 0.28 T is generated in the crystallizer 7 located in the middle of the pair of vertical magnetic poles 3, and the molten metal near the side of the crystallizer is present with or without electromagnetic braking. The liquid level fluctuation diagram is shown in Fig. 8(a) and Fig. 8(b).
由图8(a)可见，未施加磁场时，即无电磁制动条件下，金属液的上返流速度较大，金属液表面受到强烈冲击和扰动，金属液表面的波动区域宽度达到整个截面的约2/3。由图8(b)可见，当磁感应强度达到0.28T左右时，金属液表面趋于平稳且波动显著降低，金属液表面的波动区域宽减小到整个截面的1/3。因此，说明本发明的立式电磁制动装置能够有效抑制结晶器侧面附近液面的波动，有利于防止卷渣。 It can be seen from Fig. 8(a) that when no magnetic field is applied, that is, without electromagnetic braking, the upper return flow rate of the molten metal is large, the surface of the molten metal is strongly impacted and disturbed, and the width of the fluctuation surface of the molten metal surface reaches the entire cross section. About 2/3. It can be seen from Fig. 8(b) that when the magnetic induction intensity reaches about 0.28T, the surface of the molten metal tends to be stable and the fluctuation is remarkably lowered, and the width of the fluctuation surface of the molten metal surface is reduced to 1/3 of the entire cross section. Therefore, it is explained that the vertical electromagnetic brake device of the present invention can effectively suppress the fluctuation of the liquid surface in the vicinity of the side surface of the crystallizer, and is advantageous for preventing the slag from being slag.
实施例三 Embodiment 3
本实施例中，采用图1所示的立式电磁制动装置，立式磁极3与水平磁极1采用图3(c)的连接方式，则水平磁极1下方的立式磁极3高度为0mm，立式磁极3在高度上覆盖结晶器7侧面自钢液表面6区域到侵入式水口4出流钢液的冲击点及水平磁极1上方区域，结晶器7的截面尺寸为1400mm×230mm，侵入式水口4的侧孔倾角为-15°，侵入式水口4的侵入深度为170mm，拉坯速度为1.6m/min。 In the present embodiment, the vertical electromagnetic brake device shown in FIG. 1 is used. The vertical magnetic pole 3 and the horizontal magnetic pole 1 are connected in the manner of FIG. 3(c), and the vertical magnetic pole 3 below the horizontal magnetic pole 1 has a height of 0 mm. The vertical magnetic pole 3 covers the impact point of the molten steel surface 6 from the molten steel surface 6 side to the inflowing nozzle 4 and the upper portion of the horizontal magnetic pole 1 in the height of the surface of the crystallizer 7 , and the cross section of the crystallizer 7 is 1400 mm × 230 mm. The side hole inclination angle of the nozzle 4 is -15°, the intrusion depth of the intrusive nozzle 4 is 170 mm, and the casting speed is 1.6 m/min.
在水平磁极1的励磁线圈2上施加850A的电流，而结晶器7内钢液内部磁场分布图如图9所示，而有/无电磁制动条件下的结晶器侧面中心截面的钢液流场分布图如图10(a)、图10(b) 所示，而有/无电磁制动条件下的结晶器侧面中心截面的钢液表面流速分布图如图11所示。 A current of 850 A is applied to the exciting coil 2 of the horizontal magnetic pole 1, and the internal magnetic field distribution of the molten steel in the crystallizer 7 is as shown in FIG. 9, and the molten steel flow of the central section of the side surface of the crystallizer with or without electromagnetic braking is present. The field distribution is shown in Figure 10(a) and Figure 10(b). As shown, the flow velocity profile of the molten steel surface at the center section of the side of the crystallizer with or without electromagnetic braking is shown in Fig. 11.
由图9可见，钢液中磁感应强度主要集中在水平磁极1与立式磁极3所覆盖的区域，并以设置了励磁线圈2的水平磁极1所覆盖区域的磁感应强度为最强，最大值达到0.356T，且立式磁极3所覆盖区域的磁感应强度在0.2T～0.3T左右。因此，说明立式磁极3在不设置励磁线圈2的情况下，通过立式磁极3与水平磁极1的连接，利用水平磁极1的励磁线圈2就能够在立式磁极2所覆盖的区域产生较强的磁场，从而实现了控制结晶器7内钢液流动的目的。 It can be seen from Fig. 9 that the magnetic induction intensity in the molten steel is mainly concentrated in the area covered by the horizontal magnetic pole 1 and the vertical magnetic pole 3, and the magnetic induction intensity of the area covered by the horizontal magnetic pole 1 in which the exciting coil 2 is disposed is the strongest and the maximum value is reached. 0.356T, and the magnetic induction intensity of the area covered by the vertical magnetic pole 3 is about 0.2T to 0.3T. Therefore, when the vertical magnetic pole 3 is not provided with the exciting coil 2, the connection between the vertical magnetic pole 3 and the horizontal magnetic pole 1 can be made in the region covered by the vertical magnetic pole 2 by the exciting coil 2 of the horizontal magnetic pole 1. The strong magnetic field achieves the purpose of controlling the flow of molten steel in the crystallizer 7.
由图11可见，在电磁制动条件下，结晶器7内钢液表面的最大流速由0.5m/s降低到0.38m/s左右，同时由图10(b)可见，在水平磁极1下方结晶器7整个宽面的钢液流动形成平推流，这显著降低了下返流钢液的冲击深度，且在无电磁制动条件下形成的下返流涡心将消失（在图10(a)中明显可见下返流涡心），进而有利于夹杂物和气泡的上浮。因此，说明本发明的立式电磁制动装置能够有效控制结晶器侧面钢液表面波动和钢液表面流速，同时也能够控制结晶器7中心区域钢液向下流动。 It can be seen from Fig. 11 that under the electromagnetic braking condition, the maximum flow velocity of the molten steel surface in the crystallizer 7 is reduced from 0.5 m/s to about 0.38 m/s, and it can be seen from Fig. 10(b) that the crystal is crystallized below the horizontal magnetic pole 1. The entire wide-faced molten steel flow forms a flat push flow, which significantly reduces the impact depth of the lower return flow steel, and the lower return vortex formed under no electromagnetic braking conditions will disappear (in Figure 10 (a ) The vortex core is clearly visible in the bottom, which is beneficial to the floating of inclusions and bubbles. Therefore, the vertical electromagnetic brake device of the present invention can effectively control the surface fluctuation of the molten steel on the side of the mold and the flow velocity of the molten steel surface, and can also control the downward flow of the molten steel in the central portion of the crystallizer 7.
实施例中的方案并非用以限制本发明的专利保护范围，凡未脱离本发明所为的等效实施或变更，均包含于本案的专利范围中。 The embodiments of the present invention are not intended to limit the scope of the invention, and the equivalents and modifications of the invention are not included in the scope of the invention.

Claims (8)

  1. 一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：包括水平磁极、励磁线圈、立式磁极及磁轭；所述水平磁极设有一对，立式磁极设有两对；一对所述水平磁极位于侵入式水口下方且沿结晶器宽面布置，两对所述立式磁极分别布置于结晶器两侧面区域附近，两对立式磁极与一对水平磁极相交汇；所述励磁线圈及磁轭均与水平磁极相配装，通过励磁线圈施加电流，在水平磁极与立式磁极之间产生稳态磁场，结晶器内流动的钢液通过稳态磁场时受到与钢液流动方向相反的电磁力，通过电磁力控制结晶器内钢液的流动。A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, comprising: a horizontal magnetic pole, an exciting coil, a vertical magnetic pole and a yoke; the horizontal magnetic pole is provided with a pair, and the vertical magnetic pole is provided Two pairs; the pair of horizontal magnetic poles are located below the intrusive nozzle and are arranged along the broad surface of the crystallizer, two pairs of the vertical magnetic poles are respectively arranged near the two side regions of the crystallizer, and the two pairs of vertical magnetic poles are paired with a pair of horizontal magnetic poles The excitation coil and the yoke are all matched with the horizontal magnetic pole, and a current is applied through the excitation coil to generate a steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole, and the molten steel flowing in the crystallizer passes through the steady magnetic field. The electromagnetic force in the opposite direction of the flow of molten steel controls the flow of molten steel in the mold by electromagnetic force.
  2. 一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：包括水平磁极、励磁线圈、立式磁极及磁轭；所述水平磁极和立式磁极均设有两对；一对所述水平磁极位于侵入式水口下方且沿结晶器宽面布置，并记为下部水平磁极；另一对所述水平磁极位于结晶器内钢液表面附近且沿结晶器宽面布置，并记为上部水平磁极；两对所述立式磁极分别布置于结晶器两侧面区域附近，两对立式磁极与两对水平磁极相交汇；所述励磁线圈及磁轭均与水平磁极相配装，通过励磁线圈施加电流，在水平磁极与立式磁极之间产生稳态磁场，结晶器内流动的钢液通过稳态磁场时受到与钢液流动方向相反的电磁力，通过电磁力控制结晶器内钢液的流动。A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold, comprising: a horizontal magnetic pole, an exciting coil, a vertical magnetic pole and a yoke; the horizontal magnetic pole and the vertical magnetic pole are respectively provided with two pairs a pair of said horizontal magnetic poles are located below the intrusive nozzle and are arranged along the broad face of the crystallizer and are recorded as lower horizontal magnetic poles; another pair of said horizontal magnetic poles is located near the surface of the molten steel in the crystallizer and arranged along the wide surface of the crystallizer, And recorded as the upper horizontal magnetic pole; two pairs of the vertical magnetic poles are respectively arranged near the two side regions of the crystallizer, the two pairs of vertical magnetic poles and the two pairs of horizontal magnetic poles meet; the exciting coil and the yoke are matched with the horizontal magnetic poles Applying a current through the excitation coil to generate a steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole, and the molten steel flowing in the crystallizer receives an electromagnetic force opposite to the flow direction of the molten steel when passing through the steady magnetic field, and controls the crystallizer by the electromagnetic force. The flow of molten steel inside.
  3. 根据权利要求1所述的一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：两对所述立式磁极与一对水平磁极在交汇处的连接方式为：A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold according to claim 1, wherein two pairs of said vertical magnetic poles and a pair of horizontal magnetic poles are connected at the intersection:
    ① 立式磁极垂直镶嵌在水平磁极上；1 The vertical magnetic pole is vertically mounted on the horizontal magnetic pole;
    ② 立式磁极分别在水平磁极的上表面和下表面与水平磁极垂直连接；2 The vertical magnetic poles are perpendicularly connected to the horizontal magnetic poles on the upper surface and the lower surface of the horizontal magnetic pole, respectively;
    ③ 立式磁极仅在水平磁极的上表面与水平磁极垂直连接；3 The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the horizontal magnetic pole;
    ④ 立式磁极仅在水平磁极的下表面与水平磁极垂直连接。4 The vertical pole is connected perpendicularly to the horizontal pole only on the lower surface of the horizontal pole.
  4. 根据权利要求2所述的一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：两对所述立式磁极与两对水平磁极在交汇处的连接方式为：A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold according to claim 2, wherein two pairs of said vertical magnetic poles and two pairs of horizontal magnetic poles are connected at the intersection:
    ① 立式磁极分别垂直镶嵌在上部水平磁极和下部水平磁极上；1 vertical magnetic poles are vertically embedded in the upper horizontal magnetic pole and the lower horizontal magnetic pole;
    ② 立式 磁极仅垂直镶嵌在下部水平磁极上；2 vertical magnetic poles are only vertically mounted on the lower horizontal magnetic pole;
    ③ 立式磁极仅垂直镶嵌在上部水平磁极上；3 The vertical magnetic pole is only vertically mounted on the upper horizontal magnetic pole;
    ④ 立式磁极垂直镶嵌在上部水平磁极上，且立式磁极在下部水平磁极的下表面 与水平磁极垂直连接；4 The vertical magnetic pole is vertically embedded on the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole;
    ⑤ 立式磁极分别在下部水平磁极的上表面和下表面与水平磁极垂直连接；5 vertical magnetic poles are vertically connected to the horizontal magnetic poles on the upper surface and the lower surface of the lower horizontal magnetic pole;
    ⑥ 立式磁极仅在下部水平磁极的上表面与水平磁极垂直连接；6 The vertical magnetic pole is connected perpendicularly to the horizontal magnetic pole only on the upper surface of the lower horizontal magnetic pole;
    ⑦ 立式磁极在上部水平磁极的下表面与水平磁极垂直连接，且立式磁极在下部水平磁极的下表面与水平磁极垂直连接；7 The vertical magnetic pole is perpendicularly connected to the horizontal magnetic pole on the lower surface of the upper horizontal magnetic pole, and the vertical magnetic pole is vertically connected to the horizontal magnetic pole on the lower surface of the lower horizontal magnetic pole;
    ⑧ 立式磁极仅在上部水平磁极的下表面与水平磁极垂直连接 。8 The vertical pole is connected perpendicularly to the horizontal pole only on the lower surface of the upper horizontal pole.
  5. 根据权利要求3或4所述的一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：所述立式磁极的高度要求为覆盖自结晶器内钢液表面上方100mm并向下延伸1000mm的区域。A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold according to claim 3 or 4, characterized in that the height requirement of the vertical magnetic pole is covered above the surface of the molten steel in the crystallizer 100mm and extending down the 1000mm area.
  6. 根据权利要求3或4所述的一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：所述立式磁极的宽度范围为50mm～400mm。A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold according to claim 3 or 4, wherein the vertical magnetic pole has a width ranging from 50 mm to 400 mm.
  7. 根据权利要求3或4所述的一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：所述水平磁极与立式磁极之间稳态磁场的磁感应强度为0.01T～3T。A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold according to claim 3 or 4, wherein the magnetic induction intensity of the steady magnetic field between the horizontal magnetic pole and the vertical magnetic pole is 0.01 T ~ 3T.
  8. 根据权利要求3或4所述的一种控制连铸结晶器内钢液流动的立式电磁制动装置，其特征在于：根据结晶器宽度的调节变化以及控制钢液流动的实际需要，在结晶器宽度方向上，所述立式磁极与水平磁极的结合位置进行自由选定。A vertical electromagnetic brake device for controlling the flow of molten steel in a continuous casting mold according to claim 3 or 4, characterized in that: according to the adjustment of the width of the crystallizer and the actual need to control the flow of molten steel, crystallization In the width direction of the device, the combined position of the vertical magnetic pole and the horizontal magnetic pole is freely selected.
PCT/CN2017/087116 2016-07-22 2017-06-05 Vertical electromagnetic braking device for controlling flow of molten steel in continuous casting crystallizer WO2018014663A1 (en)

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JP2019510641A (en) 2019-04-18
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