CN110814330A - Top rotating type turbulence controller for continuous casting tundish - Google Patents
Top rotating type turbulence controller for continuous casting tundish Download PDFInfo
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- CN110814330A CN110814330A CN201911355352.8A CN201911355352A CN110814330A CN 110814330 A CN110814330 A CN 110814330A CN 201911355352 A CN201911355352 A CN 201911355352A CN 110814330 A CN110814330 A CN 110814330A
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- guide vane
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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Abstract
The invention discloses a top rotating type turbulence controller for a continuous casting tundish, which comprises a controller body and a hollow cavity in the controller body, wherein an outlet is formed in the upper part of the hollow cavity, and a rotating flow guide sheet which has the same rotating direction and does not exceed the eave is arranged on the upper part of the wall surface of the hollow cavity and the lower part of the eave. According to the invention, the rotational flow guide vane with consistent guide is arranged under the inner wall surface eave of the hollow chamber of the tundish turbulence controller, so that when molten steel is injected into the bottom of the hollow strong chamber of the turbulence controller from the ladle long nozzle to generate strong upward backflow, a rotational flow velocity field is generated under the guide of the rotational flow guide vane. On one hand, the intensity of the molten steel flowing back to a steel/slag interface can be weakened, the turbulent kinetic energy is reduced, the slag entrapment and the secondary oxidation of the molten steel are avoided, on the other hand, the centrifugal force generated by the rotational flow can promote the collision, the aggregation and the growth of non-metallic inclusions in the molten steel to a great extent, and the floating removal is more facilitated, so that the purpose of further purifying the molten steel in an impact area is achieved.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy and continuous casting, in particular to a top rotation type turbulence controller for a continuous casting tundish.
Background
With the continuous development of metallurgy industrialization, the requirements on the quality of steel products are more and more strict, particularly the requirements on the purity of molten steel are more and more high, and because the tundish is the last container into which the molten steel enters before the molten steel is solidified in the crystallizer, the flowing state of the molten steel in the tundish and the movement behavior of inclusions directly influence the quality of casting blanks. The turbulent behavior of the molten steel in the impact area of the tundish is a key factor causing the steel/slag to be coiled and mixed, the molten steel is exposed and the collision of impurities is long, and the flow field in the impact area is optimized to effectively improve the purity of the molten steel entering the pouring area. Molten steel is injected into the tundish from the ladle long nozzle, and the newly injected molten steel directly impacts the ladle bottom due to large turbulent kinetic energy, so that erosion of refractory materials of the tundish is aggravated, slag entrapment is caused, bottom short-circuit flow is easily formed, and the quality of steel is deteriorated. In order to avoid the problems, a plurality of metallurgists propose to arrange a turbulence controller below a ladle long nozzle in a tundish impact area, so that the molten steel is prevented from splashing and secondary oxidation caused by exposure of the molten steel when being injected into a tundish, the bottom of the tundish is prevented from being eroded, the service life of the tundish is prolonged, the average residence time of the molten steel in the tundish is prolonged, collision, growth and removal of inclusions are promoted, the proportion of a piston area and a fully mixed area in the tundish is increased, and the volume of a dead zone is reduced.
At present, numerous scholars design different types of turbulence controllers aiming at different tundish structures and steel types, play a certain positive role in preventing molten steel from splashing, relieving injection flow impact and inhibiting molten steel from being exposed, but have limited capabilities of collision growth and floating removal of inclusions, and particularly the inclusions with small grain sizes are difficult to remove.
Research shows that the reasonable rotational flow field can effectively promote the collision growth and the upward floating removal of the impurities, the theory is widely applied to the crystallizer, and the probability of collision growth and upward floating of the impurities is increased through the rotational flow field generated by electromagnetic stirring. In recent years, researchers have proposed that an electromagnetic induction heating tundish can effectively compensate heat loss of molten steel, and that the removal rate of inclusions can be improved by rotational motion caused by the pinching effect of the molten steel. The above-mentioned technique all has the equipment fixing complicacy, improves the effect and is difficult to control and the huge scheduling problem of cost. The invention patent with publication number CN104057044A discloses an internal rotation type tundish turbulence controller, which makes molten steel form an obvious rotating flow field at the bottom of the turbulence controller to achieve the purpose of promoting the floating removal of inclusions, but the designed rotational flow baffle plates are arranged at the bottom of the turbulence controller to bear huge injection impact, the generated rotating flow field turbulence kinetic energy is strong, the service life of the turbulence controller can be greatly reduced after the baffle plates are strongly eroded, and the pollution is caused to the molten steel.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and aims to provide a top-rotating tundish turbulence controller which has a simple structure, is simple and convenient to machine and operate, can form a certain rotating flow field in the turbulence controller, can effectively remove impurities, reduce turbulence energy, and avoid molten steel splashing and molten steel exposure, meets the requirement on the service life of the production process, and does not increase the production cost on the basis of effectively improving the purity of the molten steel.
In order to achieve the purpose, the invention provides the following technical scheme that the top rotating type turbulence controller for the continuous casting tundish comprises a controller body and a hollow cavity formed in the controller body, wherein an opening part is arranged at the upper end of the hollow cavity, an eave is formed at the connecting part of the opening part and the side wall of the hollow cavity, a plurality of rotational flow guide vanes with consistent rotational directions are arranged on the upper part of the inner wall of the hollow cavity and the periphery of the lower part of the eave, and the rotational flow guide vanes are uniformly distributed in the center of the turbulence controller.
Furthermore, an included angle is formed between the cyclone guide vane and the side wall of the controller body, the included angle is a rotation inclination angle, and the included angle formed between each cyclone guide vane and the side wall of the controller body is equal.
Further, the height of the cyclone guide vane is 1/3-1.0 of the height of the inner wall of the hollow cavity, the length direction of the cyclone guide vane does not exceed the opening part, the width of the cyclone guide vane is 1/5-1/2 of the height of the cyclone guide vane, the rotation inclination angle theta is 20-50 degrees, and the top surface of the cyclone guide vane is superposed with the cylindrical surface of the inner wall of the opening part.
Furthermore, the rotating direction of the rotational flow guide vane is anticlockwise in a northern hemisphere and clockwise in a southern hemisphere.
Furthermore, the rotational flow guide vane and the turbulence controller body are of an integrated molding structure and made of refractory materials with certain erosion resistance and long service life.
Further, the controller body is arranged under the ladle long nozzle, the central axis coincides with the central line of the ladle long nozzle, and the body base is embedded at the bottom of the tundish impact area.
Furthermore, the inner diameter of the opening part is 5-8 times of that of the ladle long nozzle.
Further, the controller body, the opening part and the hollow cavity chamber are in the shape of a cylinder, a truncated cone with a large upper part and a small lower part or a cube.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the swirl guide vane designed by the invention has the advantages of simple structure, simple and convenient processing and operation, and higher feasibility of field application;
2. the turbulent flow inhibition effect is obvious, and molten steel splashing, steel slag rolling and mixing and molten steel secondary oxidation can be effectively avoided;
3. the rotational flow velocity field formed at the upper part of the cavity chamber can promote the collision growth of non-metallic inclusions in molten steel and increase the probability of floating and removing the inclusions;
4. the rotating speed field can activate the flowing behavior of molten steel in the injection impact area, increase the volume fractions of the piston area and the fully mixed area, reduce the proportion of dead zones, prolong the retention time of the molten steel and further promote the floating removal of inclusions;
5. the swirling flow guide vane is positioned at the upper part of the hollow cavity, and is relatively low in molten steel erosion strength, so that molten steel pollution caused by erosion of refractory materials can be avoided, and the service life of the turbulence controller is not influenced.
Drawings
FIG. 1 is a top view of the structure of the present invention;
FIG. 2 is a cross-sectional view of the present invention through the midpoint of the height of the swirl vane;
FIG. 3 is a cross-sectional view of the present invention in an installed condition in the impact region of a tundish;
FIG. 4 is a longitudinal cross-sectional view of the invention in the installed condition in the tundish impact zone;
FIG. 5 is a flow field diagram in cross section of a conventional turbulence controller;
FIG. 6 is a cross-sectional flow field of the present invention;
the reference number in the attached drawing is as follows, 1-tundish impact area, 2-controller body, 3-hollow chamber, 4-cyclone guide vane, 5-opening part, 6-ladle long nozzle, 7-eaves.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1-4, the application provides a continuous casting tundish top rotating type turbulence controller, including controller body 2 and the well cavity 3 that forms in controller body 2, 3 upper ends of well cavity be equipped with opening 5, opening 5 forms eaves 7 with the lateral wall junction of well cavity 3, 3 inner wall upper portions of well cavity and eaves 7 lower part are provided with the several all around and revolve to unanimous whirl guide vane 4, whirl guide vane 4 is with turbulence controller center evenly distributed.
In the above embodiment, the swirl vanes 4 on the inner wall of the hollow chamber 3 are disposed on the same horizontal plane, and the opening 5 is an inlet of molten steel into the hollow chamber 3 inside the turbulence controller body 2.
In a further preferred embodiment, an included angle is formed between each swirl guide vane 4 and the side wall of the controller body 2, the included angle is a rotation inclination angle, and the included angle formed between each swirl guide vane 4 and the side wall of the controller body 2 is equal. The height of the cyclone guide vane 4 is 1/3-1.0 of the height of the inner wall of the hollow chamber 3, the length direction does not exceed the opening part 5, the width is 1/5-1/2 of the height of the cyclone guide vane 4, the rotation inclination angle theta is 20-50 degrees, and the top surface of the cyclone guide vane 4 is superposed with the cylindrical surface of the inner wall of the opening part 5.
In the above embodiment, each swirl vane 4 is parallel to and opposite to its axisymmetric swirl vane 4, the swirl vanes 4 disposed on the inner wall of the hollow chamber 3 are 4-12, preferably 8, wherein the rotation inclination angle θ is preferably 30 °, the height of the swirl vane 4 is 1/3-1.0 of the height of the hollow chamber 3, for the sake of flow guiding effect and production cost, the height of the hollow chamber 3 is preferably 1/2, the width is 1/5-1/2, preferably 1/3, the length is determined according to the rotation inclination angle and the width of the vane, and the head of the vane does not exceed the eave 7 of the turbulence controller, preferably coincides with the wall surface of the opening part 5; the head of the rotational flow guide vane 4 is arc-shaped, the center of the arc is on the central axis of the controller body 2, and the radius is equal to the inner diameter of the opening part 5. All the rotating guide vanes and the turbulence controller body 2 are of an integrated molding structure, and the material is a refractory material with certain erosion resistance and long service life.
In a further preferred embodiment, the rotational direction of the rotational flow guide vane 4 is counterclockwise in the northern hemisphere and clockwise in the southern hemisphere.
In the above embodiment, the rotating direction of the swirl guide vane 4 is determined by the south hemisphere or the north hemisphere where the present embodiment is located, if the coriolis force can cause the injection flow to rotate counterclockwise in the pouring basket to a certain extent in the north hemisphere, especially in the last stage of steel tapping of the ladle, the rotating direction of the swirl guide vane 4 is set to be counterclockwise, which can further enhance the swirling effect of the molten steel at the top of the hollow chamber 3.
In a further preferred embodiment, the controller body is arranged right below the ladle long nozzle 6, the central axis of the controller body coincides with the central line of the ladle long nozzle 6, and the body base is embedded at the bottom of the tundish impact area 1. The width or inner diameter of the opening part 5 is 5 to 8 times of the inner diameter of the ladle long nozzle 6, and 6 times is suitable generally. The body, hollow chamber 3 and opening 5 of the turbulence controller are generally cylindrical, frusto-conical or cubic in shape.
In the above embodiment, the ladle long nozzle 6 and the opening 5 are kept at a certain height distance during pouring, which can properly reduce the scouring of the molten steel on the bottom of the hollow chamber 3, reduce the turbulent kinetic energy of injection flow, and promote the symmetric flow of the molten steel to be more easily guided to a uniform rotational flow field by the flow deflector during upward backflow.
The invention is embedded on the ladle bottom of the tundish impact area 1, molten steel is injected into the turbulence controller of the invention through the ladle long nozzle 6, and a rotational flow velocity field is formed at the upper part of the hollow chamber 3, so that centrifugal force is generated, and nonmetallic inclusion in the molten steel collides and gathers towards the rotating center under the action of the centrifugal force, thereby effectively promoting the growth rate of the nonmetallic inclusion, and being beneficial to the upward floating of the collided and grown inclusion to a slag layer for removal, so as to achieve the purpose of further purifying the molten steel. The rotational flow velocity field at the upper part of the hollow chamber 3 can change the flowing direction of the upper backflow molten steel, thereby reducing the flow velocity of the molten steel flowing back to the steel/slag interface, greatly reducing the fluctuation range of the liquid level of the steel/slag and preventing the secondary oxidation of the slag entrapment and the molten steel.
Referring to fig. 5 and 6, when the molten steel is impacted by the injection, the upward backflow direction generated by the molten steel in the common turbulence controller converges to the center of the controller, and a rotational flow field in the horizontal direction is not generated. After the turbulent flow controller is adopted, the backflow direction of the injected molten steel is changed into the rotating confluence into the center of the controller under the action of the rotational flow guide vane 4, and an obvious horizontal rotating flow field is generated in the turbulent flow controller, so that the collision and agglomeration of the inclusion in the molten steel are obviously facilitated, and the inclusion is floated and removed.
The embodiment has the following specific effects: numerical simulation shows that during steady-state pouring, if molten steel is injected into the tundish impact area 1 from the ladle long nozzle 6 at a speed of 1.2m/s, the speed reaching the bottom of the hollow cavity 3 is about 1.0m/s under the buffer action of the molten steel, and the speed is reduced to about 0.m/s when the molten steel reaches the eave 7; when casting or ladle changing, the injection speed of the molten steel can be multiplied, the liquid level of the molten steel in the tundish is lower, the resistance to the impact of the injection flow is small, the speed of the injection flow impacting the bottom of the hollow cavity 3 can be increased to be more than 2.0m/s, and the backflow flow speed when reaching the position below the eave 7 is about 1.2 m/s. Therefore, the swirl guide plate 4 arranged at the top of the cavity chamber 3 is less in molten steel scouring effect and obvious in swirl effect, the service life of the turbulence controller is ensured, short-circuit flow can be effectively reduced, slag entrapment and molten steel exposure are prevented, and non-metallic inclusions have enough floating time.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (8)
1. The top rotation type turbulence controller for the continuous casting tundish is characterized by comprising a controller body and a hollow cavity formed in the controller body, wherein an opening part is formed in the upper end of the hollow cavity, an eave is formed at the joint of the opening part and the side wall of the hollow cavity, a plurality of rotation flow guide vanes with the same rotation direction are arranged on the upper part of the inner wall of the hollow cavity and on the periphery of the lower part of the eave, and the rotation flow guide vanes are uniformly distributed in the center of the turbulence controller.
2. A continuous casting tundish top-spinning turbulence controller as claimed in claim 1, wherein: the cyclone guide vane and the side wall of the controller body form an included angle, the included angle is a rotation inclination angle, and the included angle formed between each cyclone guide vane and the side wall of the controller body is equal.
3. A continuous casting tundish top-spinning turbulence controller as claimed in claim 2, wherein: the height of the cyclone guide vane is 1/3-1.0 of the height of the inner wall of the hollow cavity, the length direction of the cyclone guide vane does not exceed the opening part, the width of the cyclone guide vane is 1/5-1/2 of the height of the cyclone guide vane, the rotating inclination angle theta is 20-50 degrees, and the top surface of the cyclone guide vane is overlapped with the cylindrical surface of the inner wall of the opening part.
4. A continuous casting tundish top-spinning turbulence controller as claimed in claim 1, wherein: the rotational direction of the rotational flow guide vane is anticlockwise in a northern hemisphere and clockwise in a southern hemisphere.
5. A continuous casting tundish top-spinning turbulence controller as claimed in claim 1, wherein: the swirl guide vane and the turbulence controller body are of an integrated molding structure and made of refractory materials.
6. A continuous casting tundish top-spinning turbulence controller as claimed in claim 1, wherein: the controller body is arranged under the ladle long nozzle, the central axis of the controller body coincides with the central line of the ladle long nozzle, and the body base is embedded at the bottom of the tundish impact area.
7. A continuous casting tundish top-spinning turbulence controller as claimed in claim 1, wherein: the inner diameter of the opening part is 5-8 times of that of the ladle long nozzle.
8. A continuous casting tundish top-spinning turbulence controller as claimed in claim 1, wherein: the controller body, the opening part and the hollow cavity chamber are in the shapes of a cylinder, a truncated cone with a large upper part and a small lower part or a cube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911355352.8A CN110814330A (en) | 2019-12-25 | 2019-12-25 | Top rotating type turbulence controller for continuous casting tundish |
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| CN201911355352.8A CN110814330A (en) | 2019-12-25 | 2019-12-25 | Top rotating type turbulence controller for continuous casting tundish |
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| CN110814330A true CN110814330A (en) | 2020-02-21 |
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| CN201911355352.8A Pending CN110814330A (en) | 2019-12-25 | 2019-12-25 | Top rotating type turbulence controller for continuous casting tundish |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113231629A (en) * | 2021-05-14 | 2021-08-10 | 东北大学 | Molten steel rotating device and method in tundish |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113231629A (en) * | 2021-05-14 | 2021-08-10 | 东北大学 | Molten steel rotating device and method in tundish |
| CN113231629B (en) * | 2021-05-14 | 2022-04-08 | 东北大学 | Molten steel rotating device and method in tundish |
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