CN105195726A - Device and method for relieving negative pressure of long nozzle and impact force of molten steel - Google Patents
Device and method for relieving negative pressure of long nozzle and impact force of molten steel Download PDFInfo
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- CN105195726A CN105195726A CN201410256157.0A CN201410256157A CN105195726A CN 105195726 A CN105195726 A CN 105195726A CN 201410256157 A CN201410256157 A CN 201410256157A CN 105195726 A CN105195726 A CN 105195726A
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- long nozzle
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Abstract
The invention discloses a device and method for relieving negative pressure of a long nozzle and impact force of molten steel. When the molten steel enters a tundish from a steel ladle through the long nozzle, a magnetic field generating device is additionally arranged on the outer wall of the long nozzle, currents of the magnetic field generating device are 2-200 A, and frequency is 1-10 Hz. The magnetic field generating device comprises a pair of semicircular shells, one ends of the semicircular shells are connected through a connecting plate, and the other ends of the semicircular shells are connected through a fastening plate and a fastening bolt. The two ends of the connecting plate are fixed to the surfaces of the two semicircular shells through fixing bolts respectively. The interior of each shell is formed by winding a coil around an iron core, wherein the coil is a copper tube, and water is introduced to cool the tube or a copper wire soaked with insulating varnish is adopted to serve as the exterior of the coil for introducing and cooling water. A two-phase or three-phase power source is adopted in the device for power supply.
Description
Technical field
The present invention relates to steel ladle cast long nozzle and electromagnetism flow control technology, more particularly to a kind of device and method for slowing down long nozzle negative pressure and molten steel impulsive force.
Background technology
Long nozzle is a kind of transition apparatus for being connected steel ladle and tundish, is indispensable part in steel-smelting continuous casting production.Molten steel in steel ladle is injected into tundish by long nozzle, it is to avoid aerial secondary oxidation, and long nozzle serves the important function of molding casting.But in the case of opening and pouring, change the exposed cast in the mouth of a river such as ladle lower end, because long nozzle is more much longer than submersed nozzle, molten steel is more and more faster under acceleration of gravity, it is less and less with long nozzle inwall contact area, produce negative pressure, form inspiratory phenomenon so that the air around the mouth of a river enters long nozzle and aoxidizes molten steel.In the case of normal cast, cause slag phenomenon because beam negative pressure also brings along liquid level vortex sometimes near long nozzle.In addition, the molten steel in ladle is constantly flowed into tundish, because the kinetic energy of molten steel is acted on, the MOLTEN STEEL FLOW in ladle nozzle region is extremely unstable, and slag is often involved in molten steel, causes postorder continuous casting billet internal soundness defect.Meanwhile, the flowing of molten steel is rapid and unstable in tundish, and mixing of molten steel effect is poor, is unfavorable for stablizing molten steel supply, uniform molten steel composition and temperature, promotes the realization of the functions such as field trash exclusion.There is result of study to point out, molten steel is flowed out through ladle and tundish from smelting equipment, if not being protected by, then will there is about 70% to be mingled with and come from tundish in Steel Melt for Continuous Casting.These are mixed in tundish if do not separated, and will produce serious harm to slab quality and metallurgical technology.
Solution to the problems described above is reduction and the impulsive force for suppressing long nozzle molten steel.Electromagnetism flow control, including stirring magnetic field and braking magnetic field, have been widely studied, such as Publication No. CN1266759A, CN1638893A and CN101185957.Mould electromagnetic brake technology can suppress MOLTEN STEEL FLOW, reduce impact depth, but the equipment is typically added in outside crystallizer, relatively huger, safeguard and operating cost is also higher.
The content of the invention
Present invention aims at solve the above mentioned problem that prior art is present, the present invention is from electromagnetism and hydrodynamics, a kind of simple, the efficient and free of contamination devices and methods therefor for slowing down ladle long nozzle negative pressure and molten steel impulsive force is provided, the secondary oxidation of molten steel is reduced in the case of the exposed cast in mouth of a river lower end, the long nozzle slag because caused by beam negative pressure brings liquid level vortex nearby is prevented, continuous casting billet internal soundness is improved.
To achieve the above object, the present invention takes following technical scheme：
A kind of method for slowing down long nozzle negative pressure and molten steel impulsive force, it is characterised in that：Molten steel from ladle through long nozzle enter tundish during, set up field generator for magnetic in long nozzle outer wall, its electric current be 2~200A, frequency be 1~100Hz.
Described field generator for magnetic includes a pair of semicircular shells, and one end is connected by connecting plate, and the other end is connected by fastening plates and fastening bolt；The connecting plate two ends are separately fixed at the surface of two semicircular shells by fixing bolt；The housing, which is two, has certain thickness semicircular shell, internal to be made up of iron core and coil winding, can be using copper pipe as coil in order to which anti-locking apparatus receives damage in hot environment, and water flowing is cooled down inside pipe；Or cooled down using the copper cash of immersion insulated paint as coil outer water flowing, device can be powered using two-phase or three phase mains.
The connecting plate has certain length, and two semicircular shells can be made outwards to be fully deployed and inwardly close.
The fixing bolt is fixed on housing through connecting plate, has certain interval between fixing bolt cap and housing.
The fastening plates are rectangle steel plates, are welded on housing, and centre has a through hole to penetrate fastening bolt.
When molten steel flows through long nozzle from steel ladle, upward resistance is received in the presence of field generator for magnetic, mouth of a river negative pressure is slow down, when steel flow delivery port enters tundish, in the case where electromagnetic force lifts effect, molten steel kinetic energy is reduced, and reduces impact dynamics.
Molten steel in steel ladle flows into tundish through long nozzle, and molten steel is increasingly faster under acceleration of gravity, less and less with long nozzle inwall contact area, produces negative pressure, forms inspiratory phenomenon so that the air around the mouth of a river enters inwall, secondary oxidation molten steel.Install after the device, produce upward travelling-magnetic-field, during molten steel is dirty in addition to by acceleration of gravity, also all the time by upward electromagnetic force decelerating effect, the electromagnetic force is maximum on molten steel fluidization tower surface, support role is played to steel flow so that molten steel cross-sectional area remains unchanged, molten steel flow speed close to mouth of a river inner wall surface slows down, and the impact dynamics of steel flow is also reduced while slow down negative pressure.
In the case of opening and pouring, change the exposed cast in the long nozzle such as ladle lower end, slow down long nozzle negative pressure, can reduce due to the mouth of a river air-breathing that negative pressure is caused, can effectively prevent from injecting the secondary oxidation of Metal in Tundish through long nozzle, good condition is provided for production clean steel.In the case of normal cast, it can prevent that long nozzle from nearby bringing slag phenomenon caused by liquid level vortex because of beam negative pressure.The reduction of impulsive force when molten steel flows into tundish simultaneously, on the one hand reduces and even avoids slag from being involved in molten steel, improve Inner Quality of Billet defect；On the other hand alleviate molten steel to wash away flow straightener, improve the service life of flow straightener.
Brief description of the drawings
Fig. 1 is the top view of apparatus of the present invention；
Fig. 2 is the side view of apparatus of the present invention；
Fig. 3 is the canoe figure of apparatus of the present invention inner-core and coil；
Fig. 4 is apparatus of the present invention schematic view of the mounting position；
Fig. 5 is MOLTEN STEEL FLOW schematic diagram in long nozzle when not installing apparatus of the present invention；
MOLTEN STEEL FLOW schematic diagram in long nozzle when Fig. 6 is installation apparatus of the present invention；
Wherein, 1 housing, 2 connecting plates, 3 fixing bolts, 4 fastening plates, 5 fastening bolts, 6 steel ladle, 7 long nozzles, 8 tundish.
Embodiment
Below by some embodiments, the present invention is further described.
Embodiment 1：
In 230 × 1060mm base casting process, long nozzle external diameter is Φ 155mm, and internal diameter is Φ 100mm pulling rates when being 0.8m/min, design slow down long nozzle negative pressure and molten steel impact power apparatus design parameter is as shown in table 1.
Device parameter when the long nozzle external diameter of table 1. is Φ 155mm
During use, the housing 1 of field generator for magnetic is arranged on long nozzle 7.Because device needs water flowing to cool down, in order to prevent that temperature drop is too fast near long nozzle, refractory felt or other adiabatic, exotic material protections can be used.Start to set the size of current and frequency of device before casting.Deenergization at the end of device for opening power supply during casting, casting, cooling water is needed to continue open-minded, it is ensured that device is not burned, and the cooling water of device can be just disconnected when environment temperature is relatively low.Embodiment 2：
During 300 × 1950mm sheet billet continuous castings, long nozzle external diameter be Φ 195mm, internal diameter be Φ 135mm, pulling rate be 1.0m/min when, design slow down long nozzle negative pressure and molten steel impact power apparatus design parameter it is as shown in table 2.
Device parameter when the long nozzle external diameter of table 2. is Φ 195mm
Use applying mode be the same as Example 1.As shown in table 3, ON represents working state of device to implementation result, and OFF represents device closed mode.As can be seen that tundish oxygen content is not significantly increased under working state of device from the experimental result of table 3, illustrate that the device effectively slow down Metal in Tundish secondary oxidation caused by the negative pressure of the mouth of a river.
The application of table 3 slows down the device cast experimental result contrast of long nozzle negative pressure and molten steel impulsive force
Claims (6)
1. a kind of method for slowing down long nozzle negative pressure and molten steel impulsive force, it is characterised in that：Molten steel from ladle through long nozzle enter tundish during, set up field generator for magnetic in long nozzle outer wall, its electric current be 2~200A, frequency be 1~100Hz.
2. a kind of method for slowing down long nozzle negative pressure and molten steel impulsive force according to claim 1, it is characterised in that：Described field generator for magnetic includes a pair of semicircular shells (1), and one end is connected by connecting plate (2), and the other end is connected by fastening plates (4) and fastening bolt (5)；Connecting plate (2) two ends are separately fixed at the surface of two semicircular shells (1) by fixing bolt (3)；The housing (1) is internal to be made up of iron core and coil winding, and coil is copper pipe, and water flowing is cooled down inside pipe；Or cooled down using the copper cash of immersion insulated paint as coil outer water flowing, the device is powered using two-phase or three phase mains.
3. a kind of device for slowing down long nozzle negative pressure and molten steel impulsive force, it is characterised in that：Including a pair of semicircular shells (1), one end is connected by connecting plate (2), and the other end is connected by fastening plates (4) and fastening bolt (5)；Connecting plate (2) two ends are separately fixed at the surface of two semicircular shells (1) by fixing bolt (3)；The housing (1) is internal to be made up of iron core and coil winding, and coil is copper pipe, and water flowing is cooled down inside pipe；Or cooled down using the copper cash of immersion insulated paint as coil outer water flowing, the device is powered using two-phase or three phase mains.
4. a kind of device for slowing down long nozzle negative pressure and molten steel impulsive force according to claim 3, it is characterised in that：The length of the connecting plate (2) can make two semicircular shells (1) outwards be fully deployed and inwardly close.
5. a kind of device for slowing down long nozzle negative pressure and molten steel impulsive force according to claim 3, it is characterised in that：The fixing bolt (3) is fixed on housing (1) through connecting plate (2), has gap between fixing bolt cap and housing.
6. a kind of device for slowing down long nozzle negative pressure and molten steel impulsive force according to claim 3, it is characterised in that：The fastening plates (4) are rectangle steel plates, are welded on housing (1), and centre has a through hole to penetrate fastening bolt (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410256157.0A CN105195726A (en) | 2014-06-11 | 2014-06-11 | Device and method for relieving negative pressure of long nozzle and impact force of molten steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410256157.0A CN105195726A (en) | 2014-06-11 | 2014-06-11 | Device and method for relieving negative pressure of long nozzle and impact force of molten steel |
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| CN105195726A true CN105195726A (en) | 2015-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410256157.0A Pending CN105195726A (en) | 2014-06-11 | 2014-06-11 | Device and method for relieving negative pressure of long nozzle and impact force of molten steel |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH067906A (en) * | 1992-06-24 | 1994-01-18 | Kawasaki Steel Corp | Method for preventing clogging of molten steel flowing passage |
| WO2005002763A2 (en) * | 2003-06-17 | 2005-01-13 | Usinor | Continouos casting installation for the electromagnetic rotation of molten metal moving inside the nozzle |
| CN1768984A (en) * | 2005-09-29 | 2006-05-10 | 赫冀成 | Electromagnetic eddy flow downspout |
| US20090294091A1 (en) * | 2008-05-30 | 2009-12-03 | Jan-Erik Eriksson | Continuous Casting Device |
| WO2013174512A2 (en) * | 2012-05-24 | 2013-11-28 | Ergolines Lab S.R.L. | Electromagnetic stirring device |
| CN203621423U (en) * | 2013-12-25 | 2014-06-04 | 北京科技大学 | Electromagnetism braking device for centralizing magnetic area in continuous casting crystallizer |
-
2014
- 2014-06-11 CN CN201410256157.0A patent/CN105195726A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH067906A (en) * | 1992-06-24 | 1994-01-18 | Kawasaki Steel Corp | Method for preventing clogging of molten steel flowing passage |
| WO2005002763A2 (en) * | 2003-06-17 | 2005-01-13 | Usinor | Continouos casting installation for the electromagnetic rotation of molten metal moving inside the nozzle |
| CN1768984A (en) * | 2005-09-29 | 2006-05-10 | 赫冀成 | Electromagnetic eddy flow downspout |
| US20090294091A1 (en) * | 2008-05-30 | 2009-12-03 | Jan-Erik Eriksson | Continuous Casting Device |
| WO2013174512A2 (en) * | 2012-05-24 | 2013-11-28 | Ergolines Lab S.R.L. | Electromagnetic stirring device |
| CN203621423U (en) * | 2013-12-25 | 2014-06-04 | 北京科技大学 | Electromagnetism braking device for centralizing magnetic area in continuous casting crystallizer |
Non-Patent Citations (1)
| Title |
|---|
| 毛斌等: "《连续铸钢用电磁搅拌的理论与技术》", 31 January 2012 * |
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