CN100357049C - Electromagnetic eddy flow downspout - Google Patents

Electromagnetic eddy flow downspout Download PDF

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Publication number
CN100357049C
CN100357049C CNB2005100472906A CN200510047290A CN100357049C CN 100357049 C CN100357049 C CN 100357049C CN B2005100472906 A CNB2005100472906 A CN B2005100472906A CN 200510047290 A CN200510047290 A CN 200510047290A CN 100357049 C CN100357049 C CN 100357049C
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downspout
eddy flow
electromagnetic eddy
electromagnetic
river
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CN1768984A (en
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赫冀成
丸川雄净
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Yuan Yi
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Abstract

The present invention provides an electromagnetic eddy flow downspout, which comprises a downspout refractory ceramic tube. The present invention is characterized in that at least one rotary electromagnetic field is applied to the external of an immersed downspout or a ladle long downspout, namely that at least one electromagnetic eddy flow device is arranged around the downspout, and the electromagnetic eddy flow device is provided with water-cooling jackets inside and outside and is integrally fixed on a movable mechanism. The electromagnetic eddy-flow device is in an integrated 360 DEG annular structure, an integrated 180 DEG semi-annular structure or a split 360 DEG annular structure, and the immersed downspout can be a straight-cylinder type downspout with a single spout, a downspout with a horizontal side hole, a downspout with an inclined side hole or a downspout in a box shape. The present invention can be universally used in various technological conditions of round billets, square billets and plate billets. In the present invention, molten steel is under the powerful action of the electromagnetic field when flowing across the downspout and forms into an eddy flow, and a user can observe that the drift condition of the molten steel is obviously improved when the molten steel is injected into a crystallizer, which is in favor of raising the quality of billets in the process of continuous casting and ingot drawing.

Description

Electromagnetic eddy flow downspout
Technical field
The invention belongs to the smelting and the continuous casting technical field of steel.Promptly invent a kind of novel submersed nozzle and novel ladle long nozzle-" electromagnetic eddy flow downspout " device.
Background technology
In the technological process of production of steel, the molten steel after the refining enters submersed nozzle by slide gate nozzle control after tundish is handled, and goes out head piece (single port or twoport) and flow into crystallizer by being immersed in bottom, the mouth of a river in the crystallizer, constantly is frozen into steel billet.The mouth of a river goes out the flow regime that stream influences molten steel in the crystallizer.And the flow field of molten steel in the crystallizer, the fluctuations of temperature field and liquid level etc. directly have influence on casting speed and slab quality.
Owing to following reason, at present, the scientific and technical personnel in the iron and steel technical field it is generally acknowledged that the molten steel bias current in the submersed nozzle is difficult to avoid:
(1) slide gate nozzle all is in half-open state usually, is not vertical so cause the molten steel flow direction of downward injection submersed nozzle, but under oblique.Because this reason enters crystallizer while the interior molten steel of submersed nozzle can swing as crawling to flow downward.And this flows is not permanent flowing, and promptly molten steel is injected in the crystallizer by time-dependent stream.
(2) bonding of the inboard field trash of submersed nozzle;
(3) the operational slide gate nozzle that often exists misaligns or the like problem.
The bias current of molten steel in the submersed nozzle, for example for sheet billet continuous casting, will cause both sides, the mouth of a river go out head piece go out to flow inhomogeneous, and swing.Flow and non-uniform temperature in the crystallizer, liquid fluctuating all will cause occurring a series of problems such as volume slag, liquid level cooling, bleed-out, face crack.Particularly along with the raising of continuous casting casting speed, the mouth of a river goes out to flow the inhomogeneities aggravation, liquid fluctuating aggravation, thereby the raising of restriction pulling rate, the serious mass defect of generation strand.For circle base and billet continuous casting, also exist same problem.
In order to improve the molten steel bias current in the submersed nozzle, it is mobile to obtain stable in the crystallizer, uniform molten steel, and currently used technological means mainly contains:
(1) improves the slide gate nozzle structure, for example adopt three-clove style slide gate nozzle etc.Though the three-clove style mouth of a river is applied, this technical sophistication, require high, refractory consumption rate big and also for bias current to improve effect also little;
(2) the interior type that improves submersed nozzle designs.For example: adopt submersed nozzles such as shrinkage type, ring-shaped step type, reducing female type, these schemes are to the bad adaptability of different technology conditions, and it is also very limited to improve the degree that flows;
(3) SUMITOMO CHEMICAL metal company etc. has been developed the mechanical type eddy flow downspout in recent years.Promptly place refractory material system rotating vane in the inside of submersed nozzle.The potential energy that utilizes molten steel to flow into from top, the mouth of a river forms rotational flow by blade the time.It is even, stable that evidence, the molten steel mouth of a river of eddy flow state go out stream, improved in the crystallizer and flowed and Temperature Distribution, and obviously reduced liquid fluctuating.Thereby can obtain to improve pulling rate, improve the remarkable result of surface and internal soundness.But this method has major defect.The one, the refractory material helical blade since molten steel to wash away the life-span low, bonding easily takes place and stops up in the molten steel field trash on helical blade, often change the mouth of a river not only cost improve, more have a strong impact on production.The 2nd, under this method, the speed of circling round and the decrease speed of molten steel are directly proportional, and when flowing (as the low speed casting) at low speed, it is mobile effectively to be circled round.Promptly opening the stage of watering, changing ladle stage and casting latter stage, molten steel can not obtain necessary circle round mobile, its homogeneous temperature field, removing function such as field trash can sharply worsen.Also have, this cyclone mode is unadjustable, is difficult to adapt to the different process requirement, therefore uses to be restricted.
Summary of the invention
The objective of the invention is to seek a kind of submersed nozzle that can produce eddy flow, it can make the molten steel in the mouth of a river produce rotational flow, obtain the uniform mouth of a river and go out stream, thereby the interior molten steel of raising crystallizer flows and the uniformity of Temperature Distribution, reduce liquid fluctuating, improve the continuous casting pulling rate, improve the casting blank solidification quality.
The present invention proposes a kind of " electromagnetic eddy flow downspout ", comprise mouth of a river refractory pipe, it is characterized in that applying at least one rotary electromagnetic field in the outside at the mouth of a river, at least one electromagnetic eddy flow device is installed around promptly at the mouth of a river, and in the electromagnetic eddy flow device or be equipped with water collar outward, and overall fixed is in mechanism movably.The present invention not only is applicable to the submersed nozzle between tundish and the crystallizer, also is applicable to the long nozzle between ladle and tundish, thereby reaches clean molten steel, mentions the molten steel recovery rate, saves the effect of refractory material.
The said electromagnetic eddy flow device of the present invention is positioned on the movable mechanism, and the electromagnetic eddy flow device according to the requirement of production process, is done horizontal or vertical moving by packaged type mechanism.
" electromagnetic eddy flow downspout " proposed by the invention importantly has the submersed nozzle of rotating electromagnetic field device.The rotary electromagnetic field that utilization is produced in the submersed nozzle outside acts on the Lorentz force of molten steel in the mouth of a river, makes molten steel produce rotational flow downwards.Like this, not only can obtain the good result of above-mentioned " mechanical type eddy flow downspout ", and non-contacting cyclone mode can be avoided the defective of " mechanical type eddy flow downspout ", the acquisition practical application fully.In addition, " electromagnetic eddy flow downspout " can accurately design electromagnetic field flexibly at the technological requirement of different types strand and different steel grades, obtains best eddy flow state.
Rotary electromagnetic field around the submersed nozzle can be ring-like (360 degree) that fix or movably whole structure.In order to change production operation needs such as the mouth of a river, also can be semicircle ring-like (180 degree) or the ring-like moveable structures such as (360 degree) of split.
The applicable various submersed nozzles of the present invention, for example: the single port straight barrel type mouth of a river, the side opening horizontal type mouth of a river, side opening apsacline (be inclined upwardly or the downward-sloping) mouth of a river, box-shaped mouth of a river or the like.
Electromagnetic eddy flow downspout of the present invention, the magnetic induction intensity of its electromagnetic field are 10 -4-1T (tesla).
The design that electromagnetic field of the present invention can be accurately, optimize is so can generally use for justifying base, square billet and the various process conditions of slab.
Adopt " electromagnetic eddy flow downspout " of the present invention, owing to be to make the molten steel that immerses in the mouth of a river produce eddy flow in non-contacting mode, can transform original equipment, can keep the advantage of mechanical eddy flow (to prevent bias current, prevent the meniscus disturbance, prevent to roll up slag, remove field trash etc.), and (refractory consumption rate is big to overcome its shortcoming, the mouth of a river is easily stopped up etc.), and can also bring into play the inaccessible effect of mechanical eddy flow.Promptly be directed under the mechanical eddy flow, the mobile generation of circling round depends on the decrease speed of molten steel and is opening the stage of watering, change the ladle stage and the casting latter stage, it is mobile that molten steel can not obtain circling round of necessity, " electromagnetic eddy flow downspout " of the present invention can not rely on the decrease speed of molten steel, only need adjust arbitrarily electric current can guarantee and keep suitable circle round mobile.Here it is surpasses the advantage of mechanical type eddy flow downspout.And " electromagnetic eddy flow downspout " of the present invention can adopt the semi-round ring shape structure, is suitable for on-the-spot operation.
Description of drawings
Fig. 1 is the continuous casting process schematic diagram, and among the figure: 1 is that molten steel, 2 is that ladle, 3 is that long nozzle, 4 is that tundish, 5 is that weir and dam in tundish, 6 is that weir, 7 is that slide gate nozzle, 8 is that submersed nozzle, 9 is a crystallizer.
Fig. 2 is the electromagnetic eddy flow downspout sketch.Among the figure: 4 is that tundish, 7 is that slide gate nozzle, 8 is that submersed nozzle, 9 is that crystallizer, 10 is that electromagnetic eddy flow device, 11 is electromagnetic field travel mechanism.The electromagnetic eddy flow submersed nozzle is formed by 8,10 and 11.
Fig. 3 is the A-A profile of the electromagnetic eddy flow device among Fig. 2.Among the figure: (a) being whole ring-like electromagnetic eddy flow device (360 degree), (b) is the ring-like electromagnetic eddy flow device of semicircle (180 degree), (c) the ring-like electromagnetic eddy flow device of split (360 degree).
Fig. 4 is submersed nozzle classification schematic diagram, and (a) is the straight tubular of the single hole mouth of a river among the figure; (b) be side opening inclination shape (up or down) mouth of a river; (c) be the horizontal shape of the side opening mouth of a river; (d) be the box-shaped mouth of a river
Fig. 5 is the STRUCTURE DECOMPOSITION schematic diagram of embodiment 1;
Fig. 6 is the STRUCTURE DECOMPOSITION schematic diagram of embodiment 2;
Fig. 7 is the STRUCTURE DECOMPOSITION schematic diagram of embodiment 3;
Fig. 8 is the STRUCTURE DECOMPOSITION schematic diagram of embodiment 4;
Fig. 9 is the STRUCTURE DECOMPOSITION schematic diagram of embodiment 5;
Figure 10 is the STRUCTURE DECOMPOSITION schematic diagram of embodiment 6;
The specific embodiment
Come content of the present invention is further described and replenishes with specific embodiment below in conjunction with accompanying drawing.
Embodiment 1 is for being applicable to the electromagnetic eddy flow downspout of round billet continuous casting technology.Continuous casting mold of round billets is circular (Fig. 5 c), adopts the straight tubular of the single hole mouth of a river (Fig. 5 b) more.The mobile electromagnetical swirl-flow devices can adopt semicircle ring-like (180 the degree, Fig. 5 is a).Its magnetic induction intensity is 10 -4Tesla.
Embodiment 2 is also for being applicable to the electromagnetic eddy flow downspout of round billet continuous casting technology.Continuous casting mold of round billets is circular (Fig. 6 c), adopts the straight tubular of the single hole mouth of a river (Fig. 6 b) more.The mobile electromagnetical swirl-flow devices can adopt the ring-like electromagnetic eddy flow device of split, and (360 degree, Fig. 6 a).Its magnetic induction intensity is 10 -2Tesla.
Embodiment 3 is applicable to billet continuous casting technology.The billet continuous casting crystallizer is a square (Fig. 7 c), adopts cylindrical shape bilateral outlet (Fig. 7 b) more.The mobile electromagnetical swirl-flow devices of this embodiment can adopt semicircle ring-like (180 the degree, Fig. 7 is a).Its magnetic induction intensity is 10 -1Tesla.
Embodiment 4 also is applicable to billet continuous casting technology.The billet continuous casting crystallizer is a square (Fig. 8 c), also can adopt the straight tubular of the single hole mouth of a river (Fig. 8 b).The mobile electromagnetical swirl-flow devices of this embodiment can adopt split annular electromagnetic eddy flow device, and (360 degree, Fig. 8 a).Its magnetic induction intensity is 10 -3Tesla.
Embodiment 5 is applicable to sheet billet continuous casting technology.Continuous casting crystallizer for plate billet is rectangle (Fig. 9 c), also can adopt the box-shaped mouth of a river (Fig. 9 b).The mobile electromagnetical swirl-flow devices can adopt the ring-like electromagnetic eddy flow device of split, and (360 degree, Fig. 9 a).Its magnetic induction intensity is 10 -2Tesla.
Embodiment 6 also is applicable to sheet billet continuous casting technology.Continuous casting crystallizer for plate billet is rectangle (Figure 10 c), also can adopt the side opening shape mouth of a river (Figure 10 b) that is inclined upwardly.The mobile electromagnetical swirl-flow devices can adopt fixed integral ring-shaped electromagnetic eddy flow device, and (360 degree, Figure 10 a).Its magnetic induction intensity is 1 tesla.
Embodiment 1 and embodiment 2 also all can adopt fixed integral ring-shaped electromagnetic eddy flow device, and (360 degree, Figure 10 a).
The electromagnetic eddy flow device that is adopted in the various embodiments described above of the present invention is the cold electromagnetism winding of interior or outer water flowing, and the electromagnetic field that they produced is linear moving field, rotary electromagnetic field or spiral electromagnetic field, and its magnetic induction intensity is 10 -4～1 tesla.What the present invention paid attention to is the form and the intensity of electromagnetic field, then decides according to the condition at scene as for the concrete form of winding, and the present invention does not do special restriction.
Above-mentioned cited embodiment mainly is a submersed nozzle, but its principle and design philosophy all are applicable to the long nozzle between ladle and the tundish, for one of ordinary skill in the art, after the content and embodiment of having read the present invention's explanation, the fabrication scheme of being not difficult principle and design philosophy are promoted the use of long nozzle gets on, so do not repeat them here.

Claims (3)

1, a kind of electromagnetic eddy flow downspout, comprise mouth of a river refractory pipe, it is characterized in that applying at least one rotary electromagnetic field, at least one electromagnetic eddy flow device promptly is installed on every side at the mouth of a river in the outside at the mouth of a river, this electromagnetic eddy flow device is the cold electromagnetism winding of interior or outer water flowing, and its magnetic induction intensity is 10 -4～1 tesla, overall fixed is in mechanism movably.
2, electromagnetic eddy flow downspout as claimed in claim 1 is characterized in that the described mouth of a river is submersed nozzle between tundish and the crystallizer or the long nozzle between ladle and the tundish.
3, electromagnetic eddy flow downspout as claimed in claim 1 is characterized in that described electromagnetic eddy flow device is whole 360 degree ring type structures; Or split 360 degree loop configuration; Or 180 degree semicircle ring type structure.
CNB2005100472906A 2005-09-29 2005-09-29 Electromagnetic eddy flow downspout Active CN100357049C (en)

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* Cited by examiner, † Cited by third party
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EP3332891A1 (en) 2016-12-12 2018-06-13 ABB Schweiz AG An assembly for a metal-making process
RU2721768C1 (en) * 2017-02-20 2020-05-22 Абб Аб Method and system of mixing, designed to control electromagnetic mixer

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CN103122414A (en) * 2011-11-18 2013-05-29 沈阳中德工具有限公司 Split efficient energy-saving electroslag refining furnace
CN103962540A (en) * 2014-05-13 2014-08-06 南京钢铁股份有限公司 Continuous casting tundish, crystallizer molten steel flow control device and using method
WO2015188573A1 (en) * 2014-06-10 2015-12-17 东北大学 Continuous casting method and device with electromagnetic swirling nozzle
CN105312521B (en) * 2014-06-10 2018-05-04 东北大学 The electromagnetic eddy flow device and its support device of one side opening, magnetic circuit closure
CN104028717B (en) * 2014-06-10 2017-09-05 东北大学 A kind of electromagnetic eddy flow continuous cast method
CN105268935B (en) * 2014-06-10 2017-10-20 东北大学 A kind of two-flap type submersed nozzle electromagnetic eddy flow device and its support meanss
CN105195726A (en) * 2014-06-11 2015-12-30 鞍钢股份有限公司 Device and method for relieving negative pressure of long nozzle and impact force of molten steel
CN106541089A (en) * 2015-09-17 2017-03-29 鞍钢股份有限公司 A kind of method of the quantity of slag under reduction tundish
CN114029463A (en) * 2021-11-25 2022-02-11 山东钢铁股份有限公司 Method for solving segregation of large round billet of special steel

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US5186886A (en) * 1991-09-16 1993-02-16 Westinghouse Electric Corp. Composite nozzle assembly for conducting a flow of molten metal in an electromagnetic valve
CN1119569A (en) * 1995-07-28 1996-04-03 冶金工业部钢铁研究总院 Device for realizing semisolid casting
JPH09277034A (en) * 1996-04-10 1997-10-28 Nippon Steel Corp Method for continuously casting molten metal
JP2002103009A (en) * 2000-09-29 2002-04-09 Sumitomo Metal Ind Ltd Continuous casting method

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US5074532A (en) * 1989-07-12 1991-12-24 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." Electro-magnetic nozzle device for controlling a stream of liquid metal tapped from a crucible
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JPH09277034A (en) * 1996-04-10 1997-10-28 Nippon Steel Corp Method for continuously casting molten metal
JP2002103009A (en) * 2000-09-29 2002-04-09 Sumitomo Metal Ind Ltd Continuous casting method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3332891A1 (en) 2016-12-12 2018-06-13 ABB Schweiz AG An assembly for a metal-making process
WO2018108477A1 (en) 2016-12-12 2018-06-21 Abb Ab An assembly for a metal-making process
RU2721768C1 (en) * 2017-02-20 2020-05-22 Абб Аб Method and system of mixing, designed to control electromagnetic mixer
US10919088B2 (en) 2017-02-20 2021-02-16 Abb Schweiz Ag Method and stirring system for controlling an electromagnetic stirrer

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