CN116237508A - Stopper rod for inhibiting confluence vortex and method thereof - Google Patents
Stopper rod for inhibiting confluence vortex and method thereof Download PDFInfo
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- CN116237508A CN116237508A CN202310318472.0A CN202310318472A CN116237508A CN 116237508 A CN116237508 A CN 116237508A CN 202310318472 A CN202310318472 A CN 202310318472A CN 116237508 A CN116237508 A CN 116237508A
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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
- B22D41/14—Closures
- B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
- B22D41/18—Stopper-rods therefor
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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
- B22D41/50—Pouring-nozzles
- B22D41/507—Pouring-nozzles giving a rotating motion to the issuing molten metal
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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
- B22D41/50—Pouring-nozzles
- B22D41/60—Pouring-nozzles with heating or cooling means
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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
- B22D41/50—Pouring-nozzles
- B22D41/62—Pouring-nozzles with stirring or vibrating means
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Abstract
The utility model discloses a stopper rod for inhibiting confluence vortex and a method thereof, belonging to the technical field of water gap flow control of continuous casting tundish in metallurgical technology. The utility model comprises a stopper rod shell, wherein a stopper rod core is embedded in the stopper rod shell, and a magnetic field generating device is arranged along the peripheral wall of the stopper rod core and is used for exciting a magnetic field right above a water gap. The magnetic field generating device is an electromagnetic coil or a rotary magnetic field stirrer. According to the utility model, by adding the electromagnetic field, induced current is generated by molten steel, and the generation of confluence vortex of the tundish at the end of pouring is effectively inhibited; meanwhile, the magnetic field excited by the utility model is formed right above the water gap and has the maximum strength at the vortex forming position, so that the magnetic field has more direct inhibition effect on converging vortices, the inhibition effect is obvious, and the energy waste is avoided.
Description
Technical Field
The utility model belongs to the technical field of water gap flow control of continuous casting tundish in metallurgical technology, and particularly relates to a water gap flow control stopper rod for preventing confluence vortex from being generated during casting of the continuous casting tundish.
Background
Tundish is one of the important reaction vessels in continuous casting. As the last refractory container in the steel smelting process, the flowing state of molten steel in the tundish has an important influence on the continuous casting quality, and the cleanliness of the steel is directly influenced. The pouring box comprises two areas, namely a pouring area and an outlet area, wherein the pouring area is an area in which molten steel in the steel ladle is poured into the pouring box through a long water gap; the outlet area is a water gap area at the bottom of the tundish, and the bottom of the tundish is generally provided with one or more immersed water gaps, molten steel flows into the crystallizer through the water gaps and is not contacted with air, so that secondary oxidization of the molten steel is avoided. Since the submerged entry nozzle is a straight cylindrical channel, a converging vortex is generated at the nozzle during pouring of molten steel in the tundish. This phenomenon can have a number of adverse effects on the continuous casting process, such as slag coiling, slag tapping, etc. Thereby the slag on the surface of the molten steel is involved in the molten steel, the content of impurities in the steel is increased, and the purity of the steel is greatly influenced. Meanwhile, due to the existence of the vortex, molten steel can continuously wash out the packing and the water gap, so that the service lives of the packing and the water gap are reduced.
Converging vortices are vortices that are created when the fluid level drops to a certain level (commonly referred to as the critical height or vortex height) during the draining of a vessel. In the steelmaking process, the confluence vortex formed when the molten steel in the tundish flows out can roll covering slag on the surface of the molten steel and inclusions in the steel into the molten steel, so that the quality of a tail billet obtained at the end of pouring is seriously reduced or judged to be wasted, and the metal yield is reduced. When the liquid level is lower than a certain height, the confluence vortex can also be involved in air, so that secondary oxidation is generated on molten steel, and the quality of a casting blank is seriously affected. Currently, metallurgical worker studies have shown that factors affecting converging vortices in a tundish mainly include the following: (1) standing the fluid: after the fluid has been left to stand for a period of time, the critical height decreases and the time for the vortex to appear becomes later. (2) fluid injection direction: the standing time of the fluid is short, the critical height of the fluid for forming vortex is low when the fluid is axially injected, and the fluid is not easy to form vortex; while tangentially injected fluids have a higher critical height and are more prone to swirl. (3) Outlet eccentricity: the vortex is generated by the central outflow earlier, and the vortex is difficult to form by the eccentric outflow. (4) exit diameter: the larger the outlet diameter, the more likely the vortex will occur. (5) raising or lowering the liquid level; the vortex is more likely to occur when the liquid level rises. (6) shape of stopper: in practical production, the critical height of the vortex is slightly smaller than that of the vortex when the sliding gate valve is used for pouring, but the impact is limited, and the vortex can still be generated along the periphery of the plug. (7) water gap blowing: the gas jet is introduced around the nozzle in the axial direction, so that the generation of vortex can be suppressed. In the actual pouring process of the tundish, when the liquid level of the molten steel is poured to the critical height, pouring is stopped, so that the higher liquid level is kept to avoid swirling slag, but a large amount of molten steel remains in the tundish, the metal yield is reduced, and the production cost is increased.
Currently, the devices commonly used in tundish to inhibit swirl are stopper rods and sliding gate valves. A stopper or slide plate is typically mounted directly above the tundish bottom nozzle to control the flow of molten steel. The stopper rod control is to change the flow form of molten steel near a water gap by lifting the stopper rod, so that the formation of rotational flow is reduced; the swirl control effect of the stopper rod is superior to that of a sliding gate, however, the swirl control effect of the stopper rod is also very limited, and for some steel grades, the swirl control degree of the stopper rod is far from the requirement. Therefore, research on improving the stopper rod control nozzle rotational flow has important significance for process control of the unstable pouring process of the tundish and clean steel production.
Through retrieval, chinese patent number ZL201310075580.6, the authorized bulletin date is 5 months and 3 days in 2015, and the utility model is named as: a water gap flow control device for preventing a continuous casting tundish from generating rotational flow; the liquid discharge pipe of the application penetrates through the bottom of the tundish and extends into the tundish, one end part of the liquid discharge pipe is fixedly connected with a liquid inlet disk, the top and the side surfaces of the liquid inlet disk are sealed, one or more flow guide holes with downward openings are formed in the bottom surface of the liquid inlet disk, and the flow guide holes are communicated with the hollow part in the liquid discharge pipe; a flow control stopper rod is arranged right below the flow guide hole, the outer diameter of the flow control stopper rod is matched with the inner diameter of the corresponding flow guide hole, and the flow control stopper rod is vertically arranged and fixed at the bottom of the tundish; one end of the liquid discharge pipe positioned outside the tundish is provided with a lifting mechanism which controls the lifting movement of the liquid discharge pipe and the liquid inlet disc. The application can prevent the formation of rotational flow and improve the cleanliness of molten steel. But this application feed liquor dish and accuse flow stopper stick's cooperation is more complicated, and manufacturing cost is also higher, and the practicality is not good.
Patent number 201721686999.5, the date of the grant notice is 2018, 7 and 6, and the utility model name is a water gap flow control device for preventing confluence vortex generated during pouring of a continuous casting tundish; the flow control disc port penetrates through the bottom of the tundish and stretches into the tundish, and the bottom of the flow control disc port is connected with the submerged nozzle; the stopper rod is arranged above the flow control disc opening, the lower end of the stopper rod is concave, and an automatic lifting mechanism is arranged on the stopper rod and controls the stopper rod to move along the vertical direction, and the molten steel liquid level measuring instrument is arranged on the upper part of the tundish. The molten steel liquid level measuring instrument is used for measuring the liquid level position of molten steel; the flow control disc opening is used for controlling the flow of molten steel; the concave stopper rod is used for controlling the generation of confluence vortex; the automatic lifting mechanism is used for controlling the position of the concave stopper rod. The utility model can prevent the formation of reflux vortex and improve the cleanliness of molten steel. However, the lower end of the stopper rod is designed to be concave, so that the service life of the stopper rod is seriously reduced, and secondary pollution is easily brought to molten steel.
Disclosure of Invention
1. Problems to be solved
The anti-conflux vortex device aims at solving the problems that the existing stopper rod is poor in anti-conflux vortex effect and the purity of molten steel is easy to influence. The utility model provides a stopper rod for inhibiting confluence vortex and a method thereof, wherein an electromagnetic field is added to enable molten steel to generate induced current, so that the problem that the confluence vortex can cause a series of adverse continuous casting processes is effectively solved; meanwhile, the magnetic field excited by the utility model is formed right above the water gap and has the maximum intensity at the vortex forming position, so that the magnetic field has more direct inhibition effect on converging vortices, the effect is obvious, and the energy waste is avoided.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the utility model is as follows:
the utility model relates to a stopper rod for inhibiting confluence vortex, which comprises a stopper rod shell, wherein a stopper rod core is arranged in the stopper rod shell, and a magnetic field generating device is arranged along the peripheral wall of the stopper rod core and is used for exciting a magnetic field right above a water gap.
Further, the magnetic field generating device comprises an electromagnetic coil which is wound on the stopper rod core, and a magnetic field perpendicular to the tangential speed of the converging vortex is generated at the water gap after the electromagnetic coil is electrified.
Further, the stopper rod core is a steel pipe processed by plain carbon steel round steel, and the electromagnetic coil is coated with a refractory material.
Further, the magnetic field generating device is a rotary magnetic field stirrer, and the rotary magnetic field stirrer comprises an annular yoke, a winding coil and a shell, wherein the annular yoke is sleeved on the peripheral wall of the stopper rod core, and the winding coil is wound on the annular yoke.
Further, the rotary magnetic field stirrer is arranged at a position close to the head of the stopper rod, three groups of rotary magnetic field stirrers are arranged in the vertical direction, and three groups of rotary magnetic field stirrers respectively adopt three-phase symmetrical alternating current.
Further, the winding coil is a copper pipe coil, and a core gram winding method is adopted, and cooling water is filled in the copper pipe coil.
The method for restraining the confluence vortex by using the stopper rod for restraining the confluence vortex is characterized by comprising the following steps of:
step one, arranging an electromagnetic coil or a rotating magnetic field stirrer on the peripheral wall of a stopper rod core, and then integrally embedding the electromagnetic coil or the rotating magnetic field stirrer into a stopper rod shell;
step two, placing the assembled stopper rod at a corresponding position in the tundish;
and thirdly, after the magnetic field generating device is electrified, a magnetic field can be excited right above the water gap, and the magnetic field generating device is used for inhibiting converging vortex above the water gap.
Further, in the first step, the electromagnetic coil is wound by using the formula,
calculating the number of turns of the electromagnetic coil;
wherein L is the average length of one turn of wire in the coil; r is the radius of the rod core; delta is the air gap length; h is the coil height, b is the coil width; j is the current density in the electromagnetic coil; u is the power supply voltage; ρ is the resistivity of the conductor material; f is magnetic potential of a magnetic circuit; n (N)
The number of turns, K is the winding coefficient.
In the first step, the magnetic induction intensity of the rotary magnetic field stirrer is 0.17-0.2T.
Further, the formula is utilized
Calculating to obtain electromagnetic force generated in molten steel;
wherein B is magnetic induction intensity; b (B) 0 The magnetic induction intensity amplitude of the inner cavity of the stirrer; r is the radius of the inner cavity of the tundish; r is (r) 0 Is the radius of the inner cavity of the stirrer; p is the pole pair number;
is the current density; sigma is the conductivity of molten steel; />
Is an induced potential; />
Is slip speed, namely the speed of the relative motion of the magnetic field and molten steel; />
Is an electromagnetic force. 3. Advantageous effects
Compared with the prior art, the utility model has the beneficial effects that:
(1) According to the stopper rod for inhibiting the confluence vortex and the method thereof, the magnetic field generating device is added into the stopper rod, and the electromagnetic field is added, so that induced current is generated in molten steel, and the confluence vortex generated at the water gap position when the molten steel surface is lower than the critical height at the end of pouring of the tundish is effectively inhibited, so that the problem that the confluence vortex can cause a series of adverse continuous casting processes is solved; meanwhile, the magnetic field excited by the utility model is formed right above the water gap and has the maximum strength at the vortex forming position, so that the magnetic field has more direct inhibition effect on converging vortices, the inhibition effect is obvious, and the energy waste is avoided.
(2) According to the stopper rod for inhibiting the confluence vortex, the electromagnetic coil is wound on the stopper rod core, the electromagnetic coil is electrified, at the moment, the stopper rod core and the electromagnetic coil form an electromagnet, the two ends of the stopper rod are N, S poles respectively, and magnetic induction wires which are from the N pole to the S pole are generated around the stopper rod; when the molten steel is lower than the critical height, a confluence vortex is formed near the water gap, the rotating molten steel cuts a longitudinal magnetic induction line, tangential force opposite to the direction of vortex is generated, and the tangential speed originally existing in the molten steel is counteracted, so that the formation of the confluence vortex in the molten steel is inhibited; when the molten steel does not generate vortex, no external force is applied to the molten steel, no disturbance is caused to the molten steel, the oscillation of a slag layer on the surface of the molten steel is avoided, and the smooth floating of the inclusions is facilitated. Meanwhile, when the molten steel is static, the power of an external power supply of the electromagnetic coil can be adjusted, the electromagnetic thermal effect is utilized to carry out thermal compensation on the molten steel at the end of pouring, the problem of molten steel temperature drop at the end of pouring is effectively solved, the cleanliness of molten metal is improved, the metal yield is improved, and the guarantee is provided for subsequent smooth pouring.
(3) According to the stopper rod for inhibiting the confluence vortex, three groups of rotating magnetic field stirrers are arranged, three-phase symmetrical alternating currents are respectively adopted, when the rotating magnetic fields excited by the rotating magnetic field stirrers cut molten steel at synchronous speed, induced currents are induced in the rotating magnetic field stirrers, the induced currents interact with the molten steel to generate electromagnetic force, the stirrers are cylindrical, the electromagnetic forces induced in the molten steel are paired left and right and are opposite in direction, electromagnetic moment is formed, two adjacent groups of rotating magnetic field stirrers excite opposite magnetic fields, and the three groups of rotating magnetic fields respectively cause the molten steel to do opposite rotating motion at different heights, so that vortex formation is inhibited.
Drawings
FIG. 1 is a schematic diagram showing the magnetic field distribution of a magnetic field generating device in embodiment 1 of the present utility model;
FIG. 2 is a schematic diagram of a stopper rod for suppressing confluence vortex according to embodiment 1 of the present utility model;
FIG. 3 is a top view of a stopper rod for suppressing confluence vortex according to embodiment 1 of the present utility model;
FIG. 4 is a schematic diagram of a stopper rod for suppressing confluence vortex according to embodiment 2 of the present utility model;
fig. 5 is a top view of a stopper rod for suppressing a confluent vortex in embodiment 2 of the present utility model.
In the figure: 1. a stopper rod housing; 2. a stopper rod core; 3. an electromagnetic coil; 4. a rotating magnetic field stirrer; 41. a ring yoke; 42. a winding coil; 43. a housing.
Detailed Description
The utility model is further described below in connection with specific embodiments.
Example 1
As shown in fig. 1, 2 and 3, a stopper rod for suppressing a confluence vortex according to the present embodiment includes a stopper rod body and an electromagnetic coil 3 provided in the stopper rod body. The stopper rod body consists of a stopper rod shell 1, a stopper rod core 2, sleeve bricks and stopper head bricks. The stopper rod core 2 is a steel pipe processed by plain carbon steel round steel, and the electromagnetic coil 3 is wound on the stopper rod core 2. The electromagnetic coil 3 is connected to a power source to constitute a magnetic field generating device. At the same time, the stopper rod core 2 is coated with a refractory material outside so that the electromagnetic coil 3 is protected from the direct action of high temperature. When the electromagnetic coil 3 is energized, a magnetic field perpendicular to the tangential velocity of the converging vortex is generated at the water gap.
In the stopper rod for inhibiting the confluence vortex, in the final pouring period of a tundish, when molten steel is about to reach a critical height, an electromagnetic coil 3 is electrified, at the moment, a stopper rod core 2 and the electromagnetic coil 3 form an electromagnet, two ends of the stopper rod are N, S poles respectively, and a magnetic induction line from an N pole to an S pole is generated around the stopper rod. When the molten steel is lower than the critical height, a converging vortex is formed near the water gap, the rotating molten steel cuts a longitudinal magnetic induction line, tangential force opposite to the direction of vortex is generated, and tangential speed originally existing in the molten steel is counteracted, so that the formation of the converging vortex in the molten steel is inhibited.
Meanwhile, the magnitude and direction of the magnetic field can be changed by adjusting the magnitude and direction of the energizing current of the electromagnetic coil 3. In addition, since the electromagnetic force required to suppress the confluence vortex is not large in the actual production process, the number of turns of the electromagnetic coil 3 that generates the electromagnetic force required to suppress the confluence vortex can be calculated from the size of the stopper rod core 2.
Let magnetic circuit magnetic potential be F, coil height be h, wide be b, coil conductor sectional area be A, the number of turns be N, the coefficient of tightening be K, then:
the current density in the electromagnetic coil is:
the coil width is:
the average length of one turn of wire in the electromagnetic coil is L:
by ohm's law
And:
substituting formula (6) into formula (5) to obtain:
substituting the formula (3) and the formula (6) into the formula (5) to obtain:
the number of turns N of the coil is obtained as follows:
wherein I is current intensity, A; u is power supply voltage, V; r is a winding resistor, omega; ρ is the resistivity of the conductor material, Ω·m; delta is the length of the air gap, m; r is the radius of the iron core and m.
The method for restraining the confluence vortex by using the stopper rod of the embodiment specifically comprises the following steps:
step one, calculating the number of turns of an electromagnetic coil which generates electromagnetic force required by restraining the confluence vortex according to the size of a stopper rod core 2;
winding an electromagnetic coil 3 on the peripheral wall of the stopper rod core 2, and then integrally embedding the electromagnetic coil into the stopper rod shell 1; then placing the assembled stopper rod at a corresponding position in the tundish;
and thirdly, after the electromagnetic coil 3 is electrified, a magnetic field perpendicular to the tangential speed of the converging vortex can be generated at the water gap position and used for inhibiting the converging vortex above the water gap.
In the method for suppressing the converging vortex, tangential force opposite to the direction of vortex steering is generated by cutting a magnetic induction line through molten steel rotation in the converging vortex. Therefore, the device only has the effect on the molten steel when the vortex is generated, and when the vortex is not generated on the molten steel, no external force is applied to the molten steel, so that the disturbance on the molten steel is avoided. Avoiding the oscillation of the slag layer on the surface of the molten steel and being beneficial to the smooth floating of the inclusions. Meanwhile, the electromagnetic heat effect is utilized to carry out heat compensation on molten steel at the end of pouring, so that the problem of molten steel temperature drop at the end of pouring is effectively solved, the cleanliness of molten metal and the metal yield are improved, and the guarantee is provided for subsequent smooth pouring.
Example 2
Referring to fig. 3 and 4, a stopper rod for suppressing a confluence vortex according to the present embodiment includes a stopper rod body and a rotating magnetic field stirrer 4 provided in the stopper rod body. The stopper rod body consists of a stopper rod shell 1, a stopper rod core 2, sleeve bricks and stopper head bricks. The rotating magnetic field stirrer 4 comprises an inductor and a shell 43 made of non-magnetic stainless steel, wherein the inductor is used for exciting a rotating magnetic field, and the shell 43 made of non-magnetic stainless steel is used for protecting the inductor and blocking radiant heat. The inductor comprises an annular yoke 41 and a winding coil 42, wherein the winding coil 42 is wound on the annular yoke 41, and the annular yoke 41 is sleeved on the peripheral wall of the stopper rod core 2.
The rotary magnetic field stirrer 4 is arranged at a position close to the head of the stopper rod, three groups of rotary magnetic field stirrers 4 are arranged in the vertical direction, the three groups of rotary magnetic field stirrers 4 respectively adopt three-phase symmetrical alternating currents, and the anti-swirling effect is optimal. Of course, the number of the rotating magnetic field agitators 4 is not limited to three.
The rotary magnetic field stirrer 4 adopts an annular iron core gram winding, the winding is made of copper pipe, and 12 winding coils 42 are all sleeved on the annular yoke 41. The rotary magnetic field stirrer 4 is cooled by water cooling, and the copper pipe in the winding is cooled by water. Of course, the winding mode is not limited to the gram winding, and if the winding is a salient pole type winding, the winding is made of copper flat wires, and an O-shaped winding is sleeved on each salient pole. The number of pairs adopted by the rotating magnetic field stirrer 4 includes, but is not limited to, two pairs of poles in the present embodiment, but may also be 4 pairs of poles, 6 pairs of poles, 8 pairs of poles, or more.
The three sets of rotating magnetic field stirrers 4 in this embodiment respectively use three-phase symmetrical alternating currents to excite three sets of magnetic fields distributed sinusoidally along the circumference at different heights in the tundish. When the excited rotating magnetic field cuts molten steel at a synchronous speed, an induced current is induced therein, and the induced current interacts with the molten steel to generate electromagnetic force. Because the stirrer is cylindrical, electromagnetic forces induced in the molten steel are paired left and right and are opposite in direction, so that electromagnetic moment is formed, and the molten steel is caused to perform rotary motion. The distribution of the magnetic field in the inner cavity is as follows:
wherein B is 0 The magnetic induction intensity amplitude value is the magnetic induction intensity amplitude value of the inner cavity surface of the stirrer; r is the radius of the inner cavity; r is (r) 0 Radius of the inner cavity surface of the stirrer; p is the pole pair number.
The rotary magnetic field stirrer 4 adopts a forward and reverse alternate operation mode, and each phase winding of the rotary magnetic field stirrer 4 is applied with current with the same frequency and intensity, and phase sequence is changed according to set time, so that the excited magnetic field changes the motion direction alternately in forward and reverse directions according to set time, and molten steel intermittently rotates anticlockwise to achieve the purpose of eliminating vortex. And magnetic fields in opposite directions are excited between two adjacent groups, so that molten steel moves in opposite directions, and the optimal anti-swirling effect is achieved.
In this embodiment, the rotating magnetic field stirrer 4 requires small power, has a remarkable suppression effect, and has a large magnetic field influence area. Because the iron core of the rotating magnetic field stirrer 4 is closed, the magnetic circuit is also closed, an axisymmetric rotating magnetic field is excited in the inner cavity, electromagnetic force is generated in molten steel, and the induced power is almost used for driving the molten steel to move, so that the efficiency is very high.
With the increase of the magnetic field, the formation of the vortex is remarkably reduced, and when the magnetic induction intensity reaches 0.17-0.2T, the formation of the vortex is remarkably inhibited.
Specifically, when the rotating magnetic field stirrer 4 is fed with three-phase alternating current, a rotating magnetic field rotating around the axis is excited therein, which has not only a certain rotational speed and strength but also alternating changes in direction, and when it cuts molten steel, induced current is induced therein, that is:
wherein:
is the current density; sigma is the conductivity of molten steel; b is magnetic induction intensity; />
Is an induced potential; />
Is the slip speed, i.e. the speed of the relative movement of the magnetic field and the molten steel.
The interaction of the induced current in the molten steel with the local magnetic field generates electromagnetic forces, namely:
the method for inhibiting the confluence vortex in the embodiment specifically comprises the following steps:
sleeving a rotating magnetic field stirrer 4 on the peripheral wall of a stopper rod core 2, and then integrally embedding the rotating magnetic field stirrer into a stopper rod shell 1; then placing the assembled stopper rod at a corresponding position in the tundish;
and secondly, when the molten steel is about to reach the critical height, simultaneously switching on three groups of three-phase symmetrical sine alternating currents of the rotating magnetic field stirrers 4, and applying electromagnetic force to the molten steel to enable the molten steel to intermittently move clockwise and anticlockwise so as to inhibit vortex formation.
The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.
Claims (10)
1. The utility model provides a stopper rod for inhibiting conflux vortex, includes stopper rod shell (1), stopper rod shell (1) embedded stopper rod core (2), its characterized in that: the stopper rod core (2) is provided with a magnetic field generating device along the peripheral wall thereof, and the magnetic field generating device is used for exciting a magnetic field right above the water gap.
2. A stopper rod for suppressing confluence vortex as claimed in claim 1, wherein: the magnetic field generating device comprises an electromagnetic coil (3), wherein the electromagnetic coil (3) is wound on the stopper rod core (2), and after the electromagnetic coil (3) is electrified, a magnetic field perpendicular to the tangential speed of the converging vortex is generated at the water gap.
3. A stopper rod for suppressing confluence vortex as claimed in claim 2, wherein: the stopper rod core (2) is a steel pipe processed by plain carbon steel round steel, and the electromagnetic coil (3) is externally coated with a refractory material.
4. A stopper rod for suppressing confluence vortex as claimed in claim 1, wherein: the magnetic field generating device is a rotary magnetic field stirrer (4), and the rotary magnetic field stirrer (4) comprises an annular yoke (41), a winding coil (42) and a shell (43), wherein the annular yoke (41) is sleeved on the peripheral wall of the stopper rod core (2), and the winding coil (42) is wound on the annular yoke (41).
5. A stopper rod for suppressing a confluent vortex as defined in claim 4, wherein: the rotary magnetic field stirrer (4) is arranged at a position close to the head of the stopper rod, three groups of rotary magnetic field stirrers (4) are arranged in the vertical direction, and three groups of rotary magnetic field stirrers (4) respectively adopt three-phase symmetrical alternating current.
6. A stopper rod for suppressing a confluent vortex as defined in claim 5, wherein: the winding coil (42) is a copper pipe coil, and adopts a core gram winding method, and cooling water is filled in the copper pipe coil.
7. A method of suppressing a confluence vortex using a stopper rod for suppressing a confluence vortex according to any one of claims 1 to 6, comprising the steps of:
setting an electromagnetic coil (3) or a rotating magnetic field stirrer (4) on the peripheral wall of a stopper rod core (2), and then integrally embedding the stopper rod core into a stopper rod shell (1);
step two, placing the assembled stopper rod at a corresponding position in the tundish;
and thirdly, after the magnetic field generating device is electrified, a magnetic field can be excited right above the water gap, and the magnetic field generating device is used for inhibiting converging vortex above the water gap.
8. A method of suppressing a converging vortex as claimed in claim 7, wherein: in the first step, the electromagnetic coil (3) is wound by using a formula before winding,
calculating the number of turns of the electromagnetic coil (3);
wherein L is the average length of one turn of wire in the coil; r is the radius of the rod core; delta is the air gap length; h is the coil height, b is the coil width; j is the current density in the electromagnetic coil; u is the power supply voltage; ρ is the resistivity of the conductor material; f is magnetic potential of a magnetic circuit; n is the number of turns, and K is the winding coefficient.
9. A method of suppressing a converging vortex as claimed in claim 7, wherein: in the first step, the magnetic induction intensity of the rotary magnetic field stirrer (4) is 0.17-0.2T.
10. A method of suppressing a converging vortex as claimed in claim 9, wherein: using the formula
Calculating to obtain electromagnetic force generated in molten steel;
wherein B is magnetic induction intensity; b (B) 0 The magnetic induction intensity amplitude of the inner cavity of the stirrer; r is the radius of the inner cavity of the tundish; r is (r) 0 Is the radius of the inner cavity of the stirrer; p is the pole pair number;
is the current density; sigma is the conductivity of molten steel; />
Is an induced potential; />
Is slip speed, namely the speed of the relative motion of the magnetic field and molten steel; />
Is an electromagnetic force. />
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310318472.0A CN116237508A (en) | 2023-03-28 | 2023-03-28 | Stopper rod for inhibiting confluence vortex and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310318472.0A CN116237508A (en) | 2023-03-28 | 2023-03-28 | Stopper rod for inhibiting confluence vortex and method thereof |
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| CN202310318472.0A Pending CN116237508A (en) | 2023-03-28 | 2023-03-28 | Stopper rod for inhibiting confluence vortex and method thereof |
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2023
- 2023-03-28 CN CN202310318472.0A patent/CN116237508A/en active Pending
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