CN103464705A - Electromagnetic flow control method for retarding crystallizer liquid level fluctuation - Google Patents
Electromagnetic flow control method for retarding crystallizer liquid level fluctuation Download PDFInfo
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- CN103464705A CN103464705A CN2013104079361A CN201310407936A CN103464705A CN 103464705 A CN103464705 A CN 103464705A CN 2013104079361 A CN2013104079361 A CN 2013104079361A CN 201310407936 A CN201310407936 A CN 201310407936A CN 103464705 A CN103464705 A CN 103464705A
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Abstract
The invention provides an electromagnetic flow control method for retarding crystallizer liquid level fluctuation. When crystallizer liquid level fluctuation exceeds +/-5mm, a crystallizer spiral electromagnetic stirring device is used for producing downward spiral force to retard the flow speed of upper ring currents, wherein the spiral electromagnetic stirring frequency is 1Hz-12Hz, and the electromagnetic stirring currents are 200A-600A; perpendicular push force same with the upper ring currents in direction is generated through electromagnetic stirring; the spiral electromagnetic stirring force is changed through exchanging of two phases of an input current, and the size of the spiral force is changed through the size of the coil input current. According to the method, the molten steel flowing mode in the crystallizer can be effectively controlled, fluctuation of the crystallizer liquid level is retarded, roll slag is reduced, floating of inclusions is promoted, and the cast blank inner quality is improved. Meanwhile, molten steel in the crystallizer can be stirred, so that the temperature is uniform, solidified blank casings with uniform thickness are formed, cast blank internal stress is reduced, and the method is applicable to production of high-quality cast blanks.
Description
Technical field
The invention belongs to material electromagnetic processing forming field, particularly a kind of for slowing down the electromagnetism control flow method of continuous cast mold liquid fluctuating.
Background technology
The effect of crystallizer is to accept the molten steel beam that tundish flows out, the flow field of Mold is not only to steel in crystallizer-slag interface behavior generation material impact, and very large on the impact of the solidification and heat transfer in it, solidification front constantly is subject to burst different the washing away of degree of molten steel stream, thereby the quality of the steel liquid flow state in crystallizer directly affects surface quality and the internal soundness of strand.
Be subject to the impact at submersed nozzle inclination angle, the molten steel stream stock flowed out from the mouth of a river becomes to upper reaches thigh (flowing to crystallizer top) with to dirty strand (flowing to the crystallizer bottom).Can affect molten steel-slag interface fluctuation to the upper reaches thigh, the suitable mobile removal that contributes to field trash in molten steel, if but molten steel-slag interface fluctuation is violent, can produce slag, can affect slab quality when serious, and even cause product rejection; The steel flow flowed out when submersed nozzle arrives backward lower the dividing in narrow limit and flows through when strong; can cause crystallizer molten steel surface heat supply deficiency, the covering slag melting is bad, because mobility is bad; it is subcutaneous that the part covering slag can be wrapped in strand from inside to outside by molten steel, causes dreg defect.Simultaneously to dirty burst of thickness and the uniformity that can affect strand initial solidification base shell, to removal and the casting blank solidification tissue generation material impact of field trash.
Flowing and many relating to parameters such as pulling rate, casting width, immersion type water nozzle structure size and immerge depth of mould nozzle of molten steel in mold, the control MOLTEN STEEL FLOW that how to take some countermeasures has become the focus of current continuous casting field scientific research to reduce slag inclusion.The electromagnetism flow control comprises and stirs magnetic field and braking magnetic field that be widely studied, this is embodied in numerous patent (as publication number is CN1266759A, the patent of invention of CN1638893A and CN101185957 etc.), academic journal and meeting intercommunion document.Electromagnetic brake technology, utilize mobile metal bath stressed principle in magnetic field, suppresses flowing of molten steel in mold, reaches the purpose that slows down liquid fluctuating.But electromagnetic braking equipment manufacturing cost costliness, operation and maintenance cost is also higher.Electromagnetic agitation is a kind of effective ways that pollution-free control fluid flows, improves ingot structure.
At present, for the electromagnetic agitation of crystallizer, be mainly in order to accelerate the circumferential movement of molten steel, if stirring intensity is too high, can affect the fluctuation of liquid level; If stirring intensity is too low, can't reach the requirement that improves the inner molten steel mass-and heat-transfer of crystallizer.Thereby magnetic stirrer generally is arranged on the crystallizer bottom, the impact with the minimizing electromagnetic agitation on liquid level fluctuation of molten steel.Change the inclination angle of submersed nozzle, can improve equally flowing of molten steel in mold.But for conditions such as different casting speeds, liquid steel temperature and compositions, the inclination angle at the mouth of a river needs constantly to change and adjust, and could meet the mobile condition of molten steel in mold of optimizing.And newly manufacture and design the mouth of a river, increased equally production cost, and the mouth of a river can't be changed in the continuous casting process.
Summary of the invention
The present invention aims to provide a kind of simple, and effectively the liquid fluctuating of molten steel in the crystallization control device, reduce air-breathing and possibility slag, thereby improves the electromagnetism control flow method that slows down liquid level fluctuation of crystallizer of slab quality.
For this reason, the solution that the present invention takes is:
The present invention slows down the electromagnetism control flow method of liquid level fluctuation of crystallizer, from electromagnetic hydroimechanics, patent (application number: 201110160188.2) in conjunction with the relevant helical magnetic field generator of having applied for, proposed a kind of easily can the crystallization control device in the electromagnetic agitation method of MOLTEN STEEL FLOW mode, when the promotion molten steel in mold rotates in a circumferential direction stirring, what can distribute the mouth of a river is regulated and controled to the upper reaches thigh, and then the effective liquid fluctuating of molten steel in the crystallization control device, reduce the possibility of the air-breathing and slag of liquid level.Its concrete grammar is:
In casting process, the mold liquid level ubiquity fluctuation, when fluctuation range, belongs to normal during at ± 5mm.In other condition, under the unalterable conditions of condition such as casting speed, mouth of a river angle, when upper circulation flow velocity is too fast, can surpass ± 5mm of liquid fluctuating scope, now can outside crystallizer, place the spiral electromagnetic stirring equipment, utilize it to produce the flowing velocity that downward spiral power slows down upper circulation, reduce liquid fluctuating, reduce the possibility of slag.For the quadrate and circular billets of different size, apply the frequency range of spiral electromagnetic agitation at 1～12Hz, the electromagnetic agitation electric current, can be at 200～600A according to the structure of agitator.Can select in actual applications a frequency, then increase gradually spiral electromagnetic agitation electric current, until remain on ± 5mm of liquid fluctuating gets final product.Meanwhile, spiral electromagnetic agitation promotion molten steel produces and flows on cross section, helps lend some impetus to the circumferential mass transfer of molten steel, heat transfer, and then forms the base shell of even thickness, reduces surface defect of bloom.If the speed of upper circulation is excessively slow, be unfavorable for floating and the removal of gas and field trash in steel, now can suitably improve the flow velocity of upper circulation, but the modes such as change nozzle angles are cumbersome, be difficult for changing at once, thereby, can utilize the spiral electromagnetic agitation, make it produce the vertical direction motive force identical with upper Direction of circulation.Now the frequency range of spiral electromagnetic agitation is at 1～12Hz, and the electromagnetic agitation electric current can be regulated as required in 200～600A scope.The change of spiral electromagnetic agitation force direction, can can realize by the two-phase of exchange input current, the size of spiral power, can change by the size of coil input current, can, according to on-the-spot situation, change constantly stirring parameter and power, to adjust flowing of Mold, suppress liquid fluctuating, reduce the slag possibility, promote floating and the removal of field trash.
Beneficial effect of the present invention is:
The present invention is the type of flow of the interior molten steel of crystallization control device effectively, slows down the fluctuation of mold liquid level, is conducive to reduce slag, promotes inclusion floating, improves Inner Quality of Billet., because the spiral electromagnetic agitation has the effect rotated in a circumferential direction simultaneously, thereby can the molten steel in crystallizer be stirred simultaneously, make temperature even, formed the solidified shell of even thickness, reduced the strand internal stress, be applicable to producing the high-quality strand.
The accompanying drawing explanation
Fig. 1 is the flow vector figure of molten steel in mold on the vertical throwing face of throwing direction;
Fig. 2 is circumference base spiral electromagnetic stirring equipment structural representation;
Fig. 3 is slab spiral electromagnetic stirring equipment structural representation.
In figure: the mouth of a river 1, upper circulation 2, lower circulation 3, crystallizer 4, yoke 5, coil 6, upper cushion block 7, lower cushion block 8, casing 9.
The specific embodiment
As can be seen from Figure 1, while utilizing submersed nozzle 1, the steel flow delivery port, run into crystallizer 4 wall shuntings, forms upwards circulation 2 and circulation 3 downwards.Generally in casting process, the liquid level fluctuation of crystallizer scope belongs to normal when ± 5mm.
Embodiment 1:
In 280 * 380 billet continuous casting processes, as shown in Figure 2, design parameter is as shown in table 1 for the built-in spiral magnetic stirrer of crystallizer 4 structure of design.
The little square billet of table 1, the built-in spiral magnetic stirrer of round mold parameter
| Title | Parameter |
| Agitator casing 9 internal diameters | Ф450mm |
| Agitator casing 9 external diameters | Ф700mm |
| Agitator casing 9 height | 350mm |
| Yoke 5 inclination angles | 25o |
| Power supply | Three-phase 380V |
| Frequency | 1～12Hz |
| The maximum input current of |
600A |
In use procedure, the spiral magnetic stirrer is placed in crystallizer 4 and fixes, connect power supply and chilled(cooling) water return (CWR).In casting process, if, because the conditions such as 1 inclination angle, the mouth of a river, pulling rate cause upper circulation 2 flow velocitys excessively slow, be unfavorable for floating and the removal of field trash, now can utilize spiral to stir and produce electromagnetism component upwards, circulation 2 flow velocitys in raising.The magnetic stirrer incoming frequency is 6Hz, and input current is 400A, and input current can be regulated, and avoids surpass ± 5mm of liquid fluctuating.If upper circulation 2 flow velocitys are too high, can affect liquid fluctuating, very easily cause slag, now can produce downward electromagnetism component by the spiral magnetic stirrer, circulation 2 flow velocitys in inhibition, and then slow down liquid fluctuating.The magnetic stirrer incoming frequency is 6Hz, and input current is 500A, and input current can be regulated, when crystallization control device molten steel fluctuation gets final product in ± 5mm scope.
Embodiment 2:
In the sheet billet continuous casting process, as shown in Figure 3, yoke 5 is fixed in casing 9 by upper cushion block 7 and lower cushion block 8 mouth of a river magnetic stirrer structure of design, and coil 6 can be wound around by hollow copper pipe, interior logical water quench.Agitator can be placed on outside crystallizer 4, also can be placed on the inner chamber of crystallizer 4.The concrete parameter of agitator is as shown in table 2.
Table 2. slab spiral magnetic stirrer parameter
| Title | Parameter |
| Agitator is high | 180（mm） |
| The yoke angle of inclination | 30o |
| Power supply | Three-phase 380V |
| Frequency | 1～12Hz |
| The maximum coil input current | 600A |
In casting process, if be greater than ± 5mm of liquid fluctuating can produce downward electromagnetism component by the spiral magnetic stirrer, circulation 2 flow velocitys in inhibition, and then slow down liquid fluctuating.The magnetic stirrer incoming frequency is 6Hz, regulates input current, by the crystallizer molten steel fluctuation in ± 5mm scope.If liquid fluctuating a little less than, lower than ± 5mm, can utilize spiral to stir and produce electromagnetism component upwards, suitably improve upper circulation 2 flow velocitys, promote floating and the removal of field trash and gas.
Claims (1)
1. an electromagnetism control flow method that slows down liquid level fluctuation of crystallizer, is characterized in that, concrete grammar is:
Surpass ± 5mm of liquid level fluctuation of crystallizer scope, place the spiral electromagnetic stirring equipment outside crystallizer, utilize it to produce the flowing velocity that downward spiral power slows down upper circulation, apply the frequency range of spiral electromagnetic agitation at 1～12Hz, the electromagnetic agitation electric current is at 200～600A; First select in actual applications a frequency, then increase gradually spiral electromagnetic agitation electric current, until in remain on ± 5mm of liquid fluctuating scope; If the speed of upper circulation is excessively slow, improve the flow velocity of upper circulation, utilize the spiral electromagnetic agitation, make it produce the vertical direction motive force identical with upper Direction of circulation, the frequency range of spiral electromagnetic agitation is at 1～12Hz, and the electromagnetic agitation electric current is regulated in 200～600A scope; The change of spiral electromagnetic agitation force direction, the two-phase by the exchange input current realizes, the size of spiral power, the size by the coil input current changes.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104646643A (en) * | 2015-02-15 | 2015-05-27 | 东北大学 | Electromagnetic control method for directly restricting and controlling liquid level fluctuation of conducting metal fluid |
| CN112191818A (en) * | 2020-09-30 | 2021-01-08 | 首钢集团有限公司 | Control method and control device for reducing bias flow of molten steel in crystallizer |
| CN113102704A (en) * | 2021-04-12 | 2021-07-13 | 郭之珩 | Electromagnetic stirring device and electromagnetic stirring processing method |
| CN113426972A (en) * | 2021-06-04 | 2021-09-24 | 北京首钢股份有限公司 | Crystallizer casting powder control method, device, equipment and storage medium |
| CN115194107A (en) * | 2022-07-13 | 2022-10-18 | 沈阳工程学院 | Multi-segment independently adjustable composite magnetic field device and method for controlling molten metal flow |
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| JPS5842780B2 (en) * | 1980-03-28 | 1983-09-21 | 住友金属工業株式会社 | Electromagnetic stirring method and device |
| CN87204232U (en) * | 1987-05-16 | 1988-01-20 | 岳阳起重电磁铁厂 | Rotating magnetic field electromagnetic agitator |
| JP2001334352A (en) * | 2000-05-26 | 2001-12-04 | Nippon Steel Corp | Electromagnetic stirring device in mold for billet and stirring method |
| EP1294510B1 (en) * | 2000-06-01 | 2005-07-13 | AEMP Corporation | Apparatus for magnetically stirring a thixotropic metal slurry |
| CN102554165A (en) * | 2012-01-10 | 2012-07-11 | 辽宁科技大学 | Electromagnetic device for stirring metal melt spirally |
| CN102825245A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Helical electromagnetic stirring device |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5842780B2 (en) * | 1980-03-28 | 1983-09-21 | 住友金属工業株式会社 | Electromagnetic stirring method and device |
| CN87204232U (en) * | 1987-05-16 | 1988-01-20 | 岳阳起重电磁铁厂 | Rotating magnetic field electromagnetic agitator |
| JP2001334352A (en) * | 2000-05-26 | 2001-12-04 | Nippon Steel Corp | Electromagnetic stirring device in mold for billet and stirring method |
| EP1294510B1 (en) * | 2000-06-01 | 2005-07-13 | AEMP Corporation | Apparatus for magnetically stirring a thixotropic metal slurry |
| CN102825245A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Helical electromagnetic stirring device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104646643A (en) * | 2015-02-15 | 2015-05-27 | 东北大学 | Electromagnetic control method for directly restricting and controlling liquid level fluctuation of conducting metal fluid |
| CN112191818A (en) * | 2020-09-30 | 2021-01-08 | 首钢集团有限公司 | Control method and control device for reducing bias flow of molten steel in crystallizer |
| CN113102704A (en) * | 2021-04-12 | 2021-07-13 | 郭之珩 | Electromagnetic stirring device and electromagnetic stirring processing method |
| CN113426972A (en) * | 2021-06-04 | 2021-09-24 | 北京首钢股份有限公司 | Crystallizer casting powder control method, device, equipment and storage medium |
| CN115194107A (en) * | 2022-07-13 | 2022-10-18 | 沈阳工程学院 | Multi-segment independently adjustable composite magnetic field device and method for controlling molten metal flow |
| CN115194107B (en) * | 2022-07-13 | 2023-05-16 | 沈阳工程学院 | Multi-stage independent adjustable composite magnetic field device and method for controlling metal liquid flow |
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Application publication date: 20131225 |