CN103962540A - Continuous casting tundish, crystallizer molten steel flow control device and using method - Google Patents
Continuous casting tundish, crystallizer molten steel flow control device and using method Download PDFInfo
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- CN103962540A CN103962540A CN201410198598.XA CN201410198598A CN103962540A CN 103962540 A CN103962540 A CN 103962540A CN 201410198598 A CN201410198598 A CN 201410198598A CN 103962540 A CN103962540 A CN 103962540A
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Abstract
The invention discloses a continuous casting tundish, a crystallizer molten steel flow control device and a using method. The device comprises an electromagnetic stirrer, a cooling jacket and a heat insulating layer, wherein the electromagnetic stirrer is arranged on the outer side of an upper water opening and is located in a permanent layer below a working layer of the tundish, the cooling jacket is wrapped outside the electromagnetic stirrer and the heat insulating layer is wrapped outside the cooling jacket. An air inlet and an air outlet are formed in the cooling jacket and are used for leading cooling gas to cool the electromagnetic stirrer. According to the casting tundish and crystallizer molten steel flow control device, a rotating magnetic field is generated in the upper water opening, and the rotating magnetic field interacts with the molten steel passing through the upper water opening to generate electromagnetic force, the generated electromagnetic force enables the molten steel passing through the upper water opening to rotate and move so as to drive the molten steel near the upper water opening in the tundish to move, so that the effect of controlling the molten steel in the tundish to move is achieved. The continuous casting tundish and crystallizer molten steel flow control device achieves simultaneous control of flow of the molten steel in the continuous casting tundish and a crystallizer and achieves low liquid level pouring of the tundish. The continuous casting tundish and crystallizer molten steel flow control device and the using method are convenient and flexible to operate and strong in adaptability, improve continuous casting billet quality and the metal yield, and reduce the production cost.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, specifically a kind of continuous casting tundish and crystallizer molten steel flow control apparatus and using method.
Background technology
One of continuous casting operation sixty-four dollar question is exactly Mold flow pattern.In crystallizer, the flowing with its heat transfer in crystallizer, solidify of molten steel, the floating of field trash and the quality of strand have close relationship, Mold flows and directly has influence on again the distribution of temperature, and then has determined internal soundness and the institutional framework of strand.A large amount of industrial practice researchs show: the blemish of strand nearly 80% originates from crystallizer, flow closely related with Mold.Meanwhile, flow uniformity important to initial solidification shell temperature of Mold, and then have influence on the surface quality of strand.At present, continuous cast mold molten steel flow control technology mainly contains mould electromagnetic brake and M-EMS, although two kinds of magnetic field differences that technology adopts, but all electromagnetic equipment is arranged on to crystallizer outside, copper coin need to be passed in magnetic field, needs the power control system of relatively high power just can have effect.Northeastern University proposes, at submersed nozzle, electromagnetic field is installed outward, drives the molten steel generation in submersed nozzle to rotatablely move, thereby molten steel flow in crystallization control device, due to the restriction of site space and produced on-site operation, is difficult to application aborning.
In continuous casting process, tundish is the intermediate link that connects ladle and crystallizer, is the linking point that is turned to continued operation by intermittently operated, is also an important ring that improves output of steel and quality.No matter operated for continuous casting and carry out smoothly, or for ensureing molten steel quality, the effect of tundish all can not be ignored.In continuous casting process, control molten steel flow in tundish, change molten steel moving line in tundish, extend the time of staying of molten steel in tundish, for promoting inclusion floating to get rid of, improve molten steel degree of purity, reduce strand inner inclusion, to change inclusion morphology significant.In the time that tundish molten steel is poured into a mould, filling pipe end place molten steel can produce whirlpool while outflow, has experience known, when molten steel is flowed downward by vertical outlet, when lower than a certain critical altitude, above outlet, can form whirlpool funnel, the eddy current that confluxes, the direction of this eddy current is clockwise.The whirlpool that confluxes that molten steel outflow process forms can be involved in molten steel inside field trash in the covering slag of pouring basket liquid level and molten steel, is even involved in air, makes molten steel generation secondary oxidation, affects molten steel degree of purity, worsens slab quality.In order to prevent the impact of whirlpool on slab quality of confluxing, cast leaves the molten steel of certain altitude latter stage conventionally in tundish, in the time that liquid level drops to the critical altitude of vortex arising, close at once the mouth of a river, although can avoid like this eddy current slag, but the interior residual a large amount of molten steel of the tundish that can make cast end, reduces recovery rate of iron, increases production cost.
Summary of the invention
In view of continuous casting tundish and the mobile importance of crystallizer molten steel, the object of this invention is to provide a kind of continuous casting tundish and crystallizer molten steel flow control apparatus and using method.This device is arranged on tundish upper nozzle outside, make generation rotating excitation field in filling pipe end, described magnetic field and the generation electromagnetic force that interacts by filling pipe end molten steel, make to produce and rotatablely move by the molten steel of filling pipe end, control the molten steel flow that enters continuous cast mold by submersed nozzle, in filling pipe end, rotatablely moving of molten steel can drive near the motion of molten steel filling pipe end in tundish simultaneously, thereby plays the effect of controlling molten steel motion in tundish.
The object of the invention is to be achieved through the following technical solutions:
A kind of continuous casting tundish and crystallizer molten steel flow control apparatus, is characterized in that: this device comprises magnetic stirrer, coolant jacket and heat insulation layer, and this magnetic stirrer is arranged on filling pipe end outside, and be positioned at the permanent layer below the working lining of tundish; Coolant jacket is coated on magnetic stirrer outside; Be coated with heat insulation layer at coolant jacket; On coolant jacket, be provided with for logical refrigerating gas magnetic stirrer is carried out to cooling air inlet and gas outlet, magnetic stirrer is arranged on tundish upper nozzle outside, and permanent layer below the working lining being positioned at.
In the present invention, coolant jacket air inlet height space position is higher than height space position, gas outlet; Coolant jacket is welded by the austenitic stainless steel of nearly filling pipe end one side with away from the copper of filling pipe end one side.
A using method for continuous casting tundish and crystallizer molten steel flow control apparatus, is characterized in that the method is specific as follows:
1) utilize magnetic stirrer in filling pipe end, to produce rotating excitation field, this magnetic field and the generation electromagnetic force that interacts by filling pipe end molten steel, make to be produced and rotatablely moved by the molten steel of filling pipe end; Meanwhile, air inlet and gas outlet pass to refrigerating gas, carry out cooling to magnetic stirrer;
2) change the sense of current of magnetic stirrer and rotatablely moving of the interior molten steel of strength control filling pipe end, drive the submersed nozzle and near the molten steel motion of the interior filling pipe end of tundish that are connected with filling pipe end, thus the interior molten steel motion of crystallization control device and tundish.
In continuous casting initial stage and mid-term, make magnetic stirrer produce clockwise or counterclockwise moving magnetic field by adjusting electric current, make produce clockwise or be rotated counterclockwise by the molten steel of filling pipe end; In the continuous casting later stage, changing the sense of current makes magnetic stirrer produce counterclockwise moving magnetic field, make the molten steel by filling pipe end produce counterclockwise rotation, offset because tundish liquid level reduces the clockwise direction the producing eddy current that confluxes, realize the low liquid level of tundish and pour into a mould.
In the present invention, magnetic stirrer produces rotating excitation field in filling pipe end, magnetic field and the generation electromagnetic force that interacts by filling pipe end molten steel, make to produce and rotatablely move by the molten steel of filling pipe end, control the molten steel flow that enters continuous cast mold by submersed nozzle, in filling pipe end, rotatablely moving of molten steel can drive near the motion of molten steel filling pipe end in tundish simultaneously, thereby plays the effect of controlling molten steel motion in tundish.Coolant jacket is provided with air inlet and gas outlet, passes to refrigerating gas, carries out cooling to magnetic stirrer.
In continuous casting initial stage and mid-term, make magnetic stirrer produce the clockwise or counterclockwise moving magnetic field of a certain intensity by adjusting the sense of current and current strength, make produce the clockwise of a certain intensity or be rotated counterclockwise motion by the molten steel of filling pipe end, control the molten steel flow that enters continuous cast mold by submersed nozzle, in filling pipe end, rotatablely moving of molten steel can drive near the motion of molten steel filling pipe end in tundish simultaneously, thereby plays the effect of controlling molten steel motion in tundish.
In the continuous casting later stage, changing the sense of current and current strength makes magnetic stirrer produce the counter clockwise direction moving magnetic field of a certain intensity, make to produce by the molten steel of filling pipe end the motion that is rotated counterclockwise of a certain intensity, drive filling pipe end outlet annex molten steel in tundish to produce motion counterclockwise, offset because tundish liquid level reduces the eddy current that confluxes clockwise producing, can realize the low liquid level cast of tundish.
The present invention can realize simultaneously and control continuous casting tundish and Mold and flow, and can realize the low liquid level cast of tundish latter stage in cast.The present invention is flexible to operation, and strong adaptability has improved continuous casting billet quality, has improved recovery rate of iron, reduced production cost.
Brief description of the drawings
Fig. 1 is continuous casting tundish and crystallizer molten steel flow control apparatus structural representation in the present invention.
Detailed description of the invention
a kind of continuous casting tundish and crystallizer molten steel flow control apparatus, as shown in Figure 1, comprise magnetic stirrer 7, coolant jacket 6, heat insulation layer 2, magnetic stirrer is arranged on filling pipe end 1 outside, the working lining 4 that is positioned at tundish permanent layer 5 below, and magnetic stirrer is placed in coolant jacket, coolant jacket has thermal insulation layer outward, coolant jacket is welded by austenitic stainless steel and copper, for austenitic stainless steel, is copper away from filling pipe end one side at coolant jacket near filling pipe end one side (being coolant jacket inner side).In order to regulate stirring frequency and the current strength of magnetic stirrer, this device is provided with the adjusting device for adjusting magnetic stirrer frequency and current strength.Coolant jacket is provided with air inlet 3 and gas outlet 8, passes to refrigerating gas, carries out cooling to magnetic stirrer.
The using method of a kind of continuous casting tundish and crystallizer molten steel flow control apparatus, switch on to magnetic stirrer, utilize magnetic stirrer in filling pipe end, to produce rotating excitation field and interact and produce electromagnetic force by filling pipe end molten steel, make to produce and rotatablely move by the molten steel of filling pipe end, control the molten steel flow that enters continuous cast mold by submersed nozzle, in filling pipe end, rotatablely moving of molten steel can drive near the motion of molten steel filling pipe end in tundish simultaneously, thereby play the effect of controlling molten steel motion in tundish, using method is as follows:
In continuous casting initial stage and mid-term, due to the eddy current that do not conflux, make magnetic stirrer produce the clockwise or counterclockwise moving magnetic field of a certain intensity by adjusting the sense of current and current strength, make produce clockwise or be rotated counterclockwise by the molten steel of filling pipe end, control the molten steel flow that enters continuous cast mold by submersed nozzle, in filling pipe end, rotatablely moving of molten steel can drive near the motion of molten steel filling pipe end in tundish simultaneously, thereby play the effect of controlling molten steel motion in tundish, improve molten steel degree of purity, improve continuous casting billet quality.According to tundish and Mold motion, adjust frequency and the current strength of magnetic stirrer.
In the continuous casting later stage, for the impact of the eddy current that prevents from confluxing, changing the sense of current and current strength makes magnetic stirrer produce the counter clockwise direction moving magnetic field of a certain intensity, make to produce by the molten steel of filling pipe end the motion that is rotated counterclockwise of a certain intensity, drive filling pipe end outlet annex molten steel in tundish to produce motion counterclockwise, offset because tundish liquid level reduces the eddy current that confluxes clockwise producing, can realize the low liquid level cast of tundish, reduce the residual molten steel of tundish, improve recovery rate of iron.
Claims (5)
1. a continuous casting tundish and crystallizer molten steel flow control apparatus, it is characterized in that: this device is made up of magnetic stirrer (7), coolant jacket (6) and heat insulation layer (2), magnetic stirrer (7), coolant jacket (6) and heat insulation layer (2) are arranged in tundish, coolant jacket (6) is coated on magnetic stirrer (7) outside, be coated with heat insulation layer (2) at coolant jacket (6), on coolant jacket (6), be provided with for logical refrigerating gas magnetic stirrer (7) is carried out to cooling air inlet (3) and gas outlet (8); Magnetic stirrer (7) is arranged on tundish upper nozzle (1) outside, and the working lining being positioned at (4) permanent layer (5) below.
2. continuous casting tundish according to claim 1 and crystallizer molten steel flow control apparatus, is characterized in that: coolant jacket (6) is welded by the austenitic stainless steel of nearly filling pipe end (1) one side with away from the copper of filling pipe end (1) one side.
3. continuous casting tundish according to claim 1 and crystallizer molten steel flow control apparatus, is characterized in that: coolant jacket (6) air inlet (3) height space position is higher than height space position, gas outlet (8).
4. a using method for continuous casting tundish claimed in claim 1 and crystallizer molten steel flow control apparatus, is characterized in that the method is specific as follows:
1) utilize magnetic stirrer in filling pipe end (1), to produce rotating excitation field, this magnetic field and the generation electromagnetic force that interacts by filling pipe end molten steel, make to be produced and rotatablely moved by the molten steel of filling pipe end; Meanwhile, pass to refrigerating gas in air inlet (3) and gas outlet (8) of coolant jacket, carry out cooling to magnetic stirrer;
2) change the sense of current of magnetic stirrer and rotatablely moving of the interior molten steel of strength control filling pipe end, drive near molten steel filling pipe end in the interior molten steel of the submersed nozzle being connected with filling pipe end and tundish to move, thereby in crystallization control device and tundish, molten steel moves.
5. the using method of continuous casting tundish according to claim 4 and crystallizer molten steel flow control apparatus, it is characterized in that: in continuous casting initial stage and mid-term, make magnetic stirrer produce the clockwise or counterclockwise moving magnetic field of a certain intensity by adjusting the sense of current and current strength, make produce the clockwise of a certain intensity or be rotated counterclockwise motion by the molten steel of filling pipe end; In the continuous casting later stage, changing the sense of current and current strength makes magnetic stirrer produce the counter clockwise direction moving magnetic field of a certain intensity, make to produce counterclockwise rotation by the molten steel of filling pipe end, offset because tundish liquid level reduces the clockwise direction the producing eddy current that confluxes, realize the low liquid level of tundish and pour into a mould.
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| CN201410198598.XA CN103962540A (en) | 2014-05-13 | 2014-05-13 | Continuous casting tundish, crystallizer molten steel flow control device and using method |
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| CN201410198598.XA CN103962540A (en) | 2014-05-13 | 2014-05-13 | Continuous casting tundish, crystallizer molten steel flow control device and using method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106493329A (en) * | 2016-11-18 | 2017-03-15 | 辽宁科技大学 | A kind of production method of efficient control continuous casting bleed-out and device |
| 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 |
| CN108705075A (en) * | 2018-05-21 | 2018-10-26 | 东北大学 | A kind of electromagnetic type inhibits the tundish of Submerged Nozzle Clogging Course |
| CN109954871A (en) * | 2019-04-30 | 2019-07-02 | 湖南中科电气股份有限公司 | A kind of submersed nozzle heating rotating device and its working method |
| CN112296296A (en) * | 2020-09-30 | 2021-02-02 | 首钢集团有限公司 | Method for controlling liquid level fluctuation of slab crystallizer |
| CN114131007A (en) * | 2021-12-15 | 2022-03-04 | 东北大学 | Permanent magnet rotational flow continuous casting method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106493329A (en) * | 2016-11-18 | 2017-03-15 | 辽宁科技大学 | A kind of production method of efficient control continuous casting bleed-out and device |
| CN106493329B (en) * | 2016-11-18 | 2018-06-29 | 辽宁科技大学 | A kind of production method and device of efficient control continuous casting bleed-out |
| CN108705075A (en) * | 2018-05-21 | 2018-10-26 | 东北大学 | A kind of electromagnetic type inhibits the tundish of Submerged Nozzle Clogging Course |
| CN108705075B (en) * | 2018-05-21 | 2020-10-23 | 东北大学 | Electromagnetic tundish for inhibiting blockage of submerged nozzle |
| CN109954871A (en) * | 2019-04-30 | 2019-07-02 | 湖南中科电气股份有限公司 | A kind of submersed nozzle heating rotating device and its working method |
| CN112296296A (en) * | 2020-09-30 | 2021-02-02 | 首钢集团有限公司 | Method for controlling liquid level fluctuation of slab crystallizer |
| CN114131007A (en) * | 2021-12-15 | 2022-03-04 | 东北大学 | Permanent magnet rotational flow continuous casting method |
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Application publication date: 20140806 |