CN116493583A - Channel type heating and decelerating tundish device and control method - Google Patents
Channel type heating and decelerating tundish device and control method Download PDFInfo
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- CN116493583A CN116493583A CN202310501781.1A CN202310501781A CN116493583A CN 116493583 A CN116493583 A CN 116493583A CN 202310501781 A CN202310501781 A CN 202310501781A CN 116493583 A CN116493583 A CN 116493583A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 94
- 239000010959 steel Substances 0.000 claims abstract description 94
- 230000006698 induction Effects 0.000 claims abstract description 78
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 62
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 9
- 238000004401 flow injection analysis Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 20
- 238000009749 continuous casting Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention provides a channel type heating and decelerating tundish device and a control method, which belong to the technical field of continuous casting tundish induction heating and comprise the following steps: the injection chamber is used for receiving the molten steel, and the bottom of the injection chamber is provided with at least two conveying ports; the bottom surface of the distribution chamber is provided with at least one pouring outlet and a receiving port corresponding to the conveying port; the two ends of the induction heating channel are respectively connected with the conveying port and the receiving port; electromagnetic induction heating device and electromagnetic speed reducer, electromagnetic induction heating device and electromagnetic speed reducer all set up in on the induction heating passageway, electromagnetic induction heating device set up in induction heating passageway upper reaches is close to the annotate the flow chamber, electromagnetic speed reducer set up in induction heating passageway low reaches is close to the distribution chamber. According to the scheme, the residence time of molten steel in the tundish under the induction heating working condition is prolonged, and the removing effect of inclusions is improved.
Description
Technical Field
The invention belongs to the technical field of continuous casting tundish induction heating, and particularly relates to a channel type heating and decelerating tundish device and a control method.
Background
The tundish is the last refractory material container in the continuous casting production process and plays a vital role in the whole process. With the continuous improvement of the quality of special steel, the tundish not only serves as a transit container between the ladle and the crystallizer, but also is used for conveying constant-temperature and constant-quantity molten steel to the crystallizer in the unsteady pouring process. However, heat loss is unavoidable in the molten steel in the tundish in the casting process, and the casting temperature fluctuation not only affects the stability of the solidification structure form, but also directly affects the control effect of the continuous casting billet cast state quality. Various tundish heating technologies are developed for compensating the heat loss of molten steel, wherein the induction heating technology has the advantages of high heating efficiency, low noise, stable operation and the like, and is most widely applied to various enterprises at present. The channel type induction heating tundish has remarkable effects of improving a flow field, homogenizing temperature, promoting removal of inclusions and the like, and is widely paid attention to people.
In the pouring process of the channel type induction heating tundish, the induction heating equipment can select whether the equipment is started or not according to different incoming flow temperatures of the tundish, and set different equipment operation powers.
The induction heating device heats the molten steel by utilizing the electromagnetic heat effect and simultaneously has a certain force effect on the molten steel. The force effect of the induction heating equipment can lead the molten steel in the channel to not only generate spiral motion, but also accelerate the molten steel along the flowing direction, and the flow speed of the molten steel in the tundish after the induction heating is started is 5 times that of the molten steel in the tundish when the tundish is not started. In the aspect of the inclusion removal effect, the inclusion is attached and accumulated on the wall surface of the channel due to the pinch effect of electromagnetic force in the channel, and the inclusion accumulated on the wall surface can be continuously washed by the molten steel flowing fast along the channel direction, so that the inclusion accumulated on the wall surface of the channel is more easily washed off and brought to the tundish distribution area by the molten steel flowing fast. Meanwhile, the average residence time of the molten steel in the tundish is shortened due to the increase of the flow rate of the molten steel, and the impurities do not have enough time to be adsorbed by the wall surface of the tundish or the steel slag interface after reaching the distribution area, so that the quality of a casting blank is affected. Reducing the speed of molten steel in the channel along the horizontal direction of the channel also increases the residence time of the molten steel in the channel and increases the probability of the inclusions moving to the wall surface, thereby further improving the removal efficiency of the inclusions. Therefore, there is a need to develop a technique that can reduce the horizontal flow rate of molten steel in a channel.
Disclosure of Invention
In order to solve the problems, the invention provides a channel type heating and decelerating tundish device and a flow control method thereof, which can quickly compensate the temperature of molten steel, eliminate the acceleration effect on the molten steel caused by the force effect of induction heating equipment, prolong the residence time of the molten steel in the tundish under the working condition of starting induction heating, and improve the removal effect of inclusions.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in one aspect, the present invention provides a tunnel heating and decelerating tundish apparatus comprising: the injection chamber is used for receiving the molten steel, and the bottom of the injection chamber is provided with at least two conveying ports; the bottom surface of the distribution chamber is provided with at least one pouring outlet and a receiving port corresponding to the conveying port; the two ends of the induction heating channel are respectively connected with the conveying port and the receiving port; electromagnetic induction heating device and electromagnetic speed reducer, electromagnetic induction heating device and electromagnetic speed reducer all set up in on the induction heating passageway, electromagnetic induction heating device set up in induction heating passageway upper reaches is close to the annotate the flow chamber, electromagnetic speed reducer set up in induction heating passageway low reaches is close to the distribution chamber.
Further, the electromagnetic induction heating device comprises a first annular iron core and a first electromagnetic coil wound on the first iron core, and the axis of the first iron core coincides with the axis of the induction heating channel.
Further, when the induction heating channels are arranged in parallel, the first electromagnetic coils of the two electromagnetic induction heating devices are wound on the adjacent edges of the two first iron cores, and the two electromagnetic induction heating devices are positioned on the same plane.
Further, the electromagnetic speed reducing device comprises a pair of second iron cores symmetrically arranged on two sides of the induction heating channel and a second electromagnetic coil wound on the second iron cores, and one sides, close to the two second iron cores, of the two second iron cores are opposite.
Further, the surface of the second iron core matched with the induction heating channel is rectangular or arc-shaped so as to be matched with the induction heating channel.
Further, the first electromagnetic coil is located at one side of the symmetry plane of the two second iron cores, and the distance between the first electromagnetic coil and the symmetry plane is greater than the distance between the second iron cores and the symmetry plane.
Further, the height of the second electromagnetic coil of the electromagnetic speed reducing device is not smaller than the height of the induction heating channel, and the length of the electromagnetic speed reducing device is not longer than 1/3 of the horizontal length of the induction heating channel.
Further, the power of the electromagnetic induction heating device and the power of the electromagnetic speed reducing device satisfy the following conditions:
p h ＝λ 1 p b or (b)
Wherein p is h For the power of the electromagnetic induction heating device, p b Lambda is the power of the electromagnetic speed reducer 1 For the first correction coefficient, the value range is 1-3 lambda 2 For the second correction coefficient, the value range is 0.5-0.8, v x V is the axial average flow velocity of molten steel r Is the average speed of molten steel in the circumferential direction.
Further, the magnetic induction intensity of the electromagnetic speed reducing device meets the following formula:
wherein ρ is the density of molten steel, u is the flow rate of molten steel, N is the magnetic interaction parameter, the value range is 3-7, σ is the conductivity, and D is the channel diameter.
On the other hand, the invention provides a control method of the channel type heating and decelerating tundish device, which comprises the following steps:
1) In the initial stage of pouring, after molten steel enters a tundish from a ladle, the molten steel firstly reaches a flow injection chamber, flows through an induction heating channel and then reaches a distribution chamber;
2) The electromagnetic induction heating device can be started after the liquid level of molten steel in the pouring flow chamber passes through the channel, and the electromagnetic speed reducing device is started at the same time;
3) After the last ladle is poured, the electromagnetic induction heating device and the electromagnetic speed reducing device firstly increase the power along with the reduction of the liquid level in the tundish, and the electromagnetic induction heating device and the electromagnetic speed reducing device are simultaneously closed after the liquid level of molten steel is lower than the induction heating channel.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: (1) The channel type heating and decelerating tundish device and the control method can effectively reduce the superheat degree of molten steel, accurately control the temperature of each flow of the tundish, are favorable for realizing a constant-temperature constant-pull-speed process, improve the quality uniformity of casting blanks and ensure the stability of solidification structure forms, and particularly, when an electromagnetic induction heating device heats the molten steel, the action of the action on the flow of the molten steel increases the movement speed of the molten steel in the axial direction and the circumferential direction, when the axial movement speed increases, the superheat degree of the molten steel in a distribution chamber can be changed, and the stability of the flow of the molten steel is reduced due to the change of a molten steel temperature field, so that the solidification structure forms are unstable; (2) The invention aims at the problems that the accelerating flow of the molten steel in the tundish caused by the force effect of the electromagnetic induction heating device further causes the flushing of the inner wall of the induction heating channel, the reduction of the residence time of the molten steel and the like, and the electromagnetic field is applied in a targeted way at the part of the heating channel, namely the electromagnetic speed reducing device, so that the pinch effect brought by induction heating equipment is reserved, the flow of the molten steel along the channel direction is accurately reduced, the flow state of the molten steel in the tundish is improved to the greatest extent, the residence time of the molten steel is prolonged, and the inclusion removing effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a channel heating and decelerating tundish device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electromagnetic speed reducer according to an embodiment of the present invention;
FIG. 3 is a diagram showing an arrangement structure of an electromagnetic induction heating device and an electromagnetic speed reducing device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the flow state of molten steel in a tundish under the combined action of the electromagnetic induction heating device and the electromagnetic speed reducing device provided in embodiment 1 of the present invention;
FIG. 5 is a schematic view of the flow of molten steel in the tundish without using the electromagnetic induction heating device and the electromagnetic deceleration device according to comparative example 1;
FIG. 6 is a schematic view showing a flow state of molten steel in a tundish using only an electromagnetic induction heating apparatus as provided in comparative example 2;
FIG. 7 shows distribution of inclusions in steel of different processes under electron microscope, a is distribution of inclusions in steel billets prepared in comparative example 2; b is the distribution of inclusions in the steel slab prepared in example 1.
Reference numerals: 1-an injection chamber; 2-a dispensing chamber; 3-an induction heating tunnel; 4-an electromagnetic induction heating device; 41-a first electromagnetic coil; 42-a first core; 5-an electromagnetic speed reduction device; 51-a second core; 52-a second electromagnetic coil.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
The invention provides a channel type heating and decelerating tundish device, as shown in figure 1, comprising:
a flow injection chamber 1, wherein the flow injection chamber 1 receives the molten steel, and at least two conveying ports are arranged at the bottom of the flow injection chamber 1; a distribution chamber 2, wherein the bottom surface of the distribution chamber 2 is provided with at least one pouring outlet and a receiving port corresponding to the conveying port; the two ends of the induction heating channel 3 are respectively connected with the conveying port and the receiving port; electromagnetic induction heating device 4 and electromagnetic speed reducer 5, electromagnetic induction heating device 4 and electromagnetic speed reducer 5 all set up in on the induction heating passageway, electromagnetic induction heating device 4 set up in induction heating passageway 3 upper reaches is close to annotate flow chamber 1, electromagnetic speed reducer 5 set up in induction heating passageway 3 low reaches is close to distribution chamber 2.
According to the invention, by arranging the electromagnetic induction heating device and the electromagnetic speed reducing device, the stability of the distribution of the temperature field and the flow field of the flow injection chamber and the distribution chamber is improved, so that the prepared solidification structure meets the technical requirements, and the pinch effect of the electromagnetic induction heating device and the static force of the electromagnetic speed reducing device are utilized, so that the residence time of molten steel is prolonged, and the removal effect of inclusions is improved.
The electromagnetic induction heating device 4 and the electromagnetic speed reducing device 5 are respectively powered by two sets of independent power supplies, and respectively control power supply current, frequency and current form; the induction heating device adopts power frequency single-phase alternating current; the speed reducer adopts direct current, and the magnetic field is in the form of static magnetic field.
It should be noted that two or more delivery ports provided in the flow injecting chamber and one receiving port provided in the distributing chamber may be provided, one receiving port is provided on the bottom surface of the distributing chamber, which corresponds to the delivery port, the delivery port is an output of molten steel, the receiving ports are used for receiving molten steel, the number of the delivery ports and the receiving ports are the same, and each delivery port and each receiving port are connected through an induction heating channel. In the embodiment of the invention, the two conveying ports of the flow injecting chamber and the two receiving ports of the distributing chamber are respectively arranged and are connected through the induction heating channel, the induction heating channel is of a straight line and hollow cylindrical structure, the cross section of the induction heating channel is of a concentric ring shape, and the two ends of the induction heating channel are respectively and fixedly connected with the flow injecting chamber and the distributing chamber through threads, ramming materials or limiting structures and the like.
The pouring outlet may be provided in one or more of the following ways based on technical design, practical situation and technical requirements, and is not specifically limited here.
The electromagnetic induction heating device 4 comprises a first annular iron core 42 and a first electromagnetic coil 41 wound on the first iron core 42, the axis of the first iron core 42 coincides with the axis of the induction heating channel 3, by the arrangement, the electric field and the magnetic field can be uniformly distributed on the section of the induction heating channel, the pinch effect is symmetrical and obvious, and the inclusions are deposited on the inner wall of the induction heating channel. In the embodiment of the invention, two parallel induction heating channels are provided, the first electromagnetic coils 41 of the two electromagnetic induction heating devices are wound on the adjacent edges of the two first iron cores 42, and the two electromagnetic induction heating devices are located on the same plane, as shown in fig. 1, the adjacent edges of the two first iron cores 42 are respectively provided with the two first electromagnetic coils 41, the energizing directions of the two first electromagnetic coils 41 are the same, the directions of magnetic fields generated in the closed loop are the same and are mutually overlapped, the synergistic effect of the two electromagnetic induction heating devices 4 is improved, and the same energizing direction can be understood as that the coils simultaneously generate upward or downward magnetic fields.
As shown in fig. 1-2, the electromagnetic speed reducer 5 includes a pair of second iron cores 51 symmetrically disposed on two sides of the induction heating channel and a second electromagnetic coil 52 wound on the second iron cores 51, wherein one sides of the two second iron cores adjacent to each other are opposite, and a surface of the second iron cores 51, which is matched with the induction heating channel 3, is rectangular or arc-shaped so as to be matched with the induction heating channel. Specifically, in order to generate a magnetic field that can be perpendicular to the induction heating path, the second electromagnetic coils 52 are wound in an axial direction parallel to the induction heating path, and the coil winding directions of the two second electromagnetic coils 52 are the same and have the same energizing direction.
In order to achieve a high electromagnetic braking effect, the closest distance between the second core 51 and the induction heating channel 3 is preferably 3.0-10.0mm.
The height of the second electromagnetic coil 52 of the electromagnetic speed reducing device 5 is not less than the height of the induction heating channel, and the length of the electromagnetic speed reducing device 5 is not longer than 1/3 of the horizontal length of the induction heating channel 3. Through the arrangement, on one hand, the magnetic field is ensured to completely penetrate through the induction heating channel, and on the other hand, the electromagnetic speed reducer is prevented from being excessively long and being interacted with the electromagnetic induction heating device 3, so that the flow field of molten steel is changed.
As shown in fig. 3, the first electromagnetic coil 41 is located at one side of the symmetry plane F of the two second iron cores 51, and the distance S1 between the first electromagnetic coil 41 and the symmetry plane F is greater than the distance S2 between the second iron cores and the symmetry plane, so that the influence of the magnetic field generated by the electromagnetic induction heating device on the electromagnetic speed reducer can be limited.
In order to adapt the electromagnetic induction heating device 4 and the electromagnetic speed reducer 5, so as to meet the synergistic effect of the electromagnetic induction heating device 4 and the electromagnetic speed reducer 5, the molten steel can generate a pinch effect in the induction heating channel to enable inclusions to be deposited on the wall surface of the induction heating channel 3, and meanwhile, the electromagnetic speed reducer can meet the requirement of reducing the axial moving speed of the molten steel to the greatest extent, and the power of the electromagnetic induction heating device and the power of the electromagnetic speed reducer meet the following conditions:
p h ＝λ 1 p b (1)
in order to further adapt the power of the electromagnetic induction heating device to the power of the electromagnetic speed reducing device, the invention further provides a more accurate relation formula of the power of the electromagnetic induction heating device and the power of the electromagnetic speed reducing device, in particular:
wherein p is h For the power of the electromagnetic induction heating device, p b Lambda is the power of the electromagnetic speed reducer 1 For the first correction coefficient, the value range is 1-3 lambda 2 For the second correction coefficient, the value range is 0.5-0.8, v x V is the axial average flow velocity of molten steel r Is the average speed of molten steel in the circumferential direction.
It should be noted that the axial average flow velocity of the molten steel is the average velocity of the molten steel flowing forward along the induction heating channel, and the circumferential average velocity of the molten steel is the average velocity of the molten steel in the process of rotating around the axis of the induction heating channel.
The magnetic induction intensity of the electromagnetic speed reducing device meets the following formula:
wherein ρ is the density of molten steel, u is the flow rate of molten steel, N is the magnetic interaction parameter, the value range is 3-7, σ is the conductivity, and D is the channel diameter.
The embodiment of the invention also provides a control method adopting the channel type heating and decelerating tundish device, which comprises the following steps:
1) In the initial stage of pouring, after molten steel enters a tundish from a ladle, the molten steel firstly reaches a flow injection chamber, flows through an induction heating channel and then reaches a distribution chamber;
2) The electromagnetic induction heating device can be started after the liquid level of molten steel in the pouring flow chamber passes through the channel, and the electromagnetic speed reducing device is started at the same time;
3) After the last ladle is poured, the electromagnetic induction heating device and the electromagnetic speed reducing device firstly increase the power along with the reduction of the liquid level in the tundish, and the electromagnetic induction heating device and the electromagnetic speed reducing device are simultaneously closed after the liquid level of molten steel is lower than the induction heating channel.
Example 1
As shown in FIG. 4, the flow state of molten steel in a tundish under the combined action of an electromagnetic induction heating device and an electromagnetic speed reducing device is schematically shown in the embodiment of the invention, wherein the capacity of the tundish is 36t, the depth of a molten pool is 790mm, the speed of a ladle long nozzle, namely the inlet of the tundish, is 1.565m/s, the blank pulling speed is constant 1.1m/min, and the diameter of a channel is 140mm.
And (3) controlling the power of the electromagnetic induction heating device and the electromagnetic speed reducing device by adopting a formula (2).
And after the electromagnetic induction heating and electromagnetic speed reducing device is started, the average residence time of the molten steel in the tundish is 562s.
Comparative example 1
Unlike example 1, this comparative example does not employ an electromagnetic induction heating device and an electromagnetic speed reducing device. The molten steel flowing state in the tundish is shown in fig. 5.
Under this condition, the average residence time of the molten steel in the tundish was 554s.
Comparative example 2
Unlike example 1, this comparative example employed only an electromagnetic induction heating device. The molten steel flowing state in the tundish is shown in fig. 6.
After the electromagnetic induction heating device is started, the average residence time of the molten steel in the tundish is 494s. In summary, the electromagnetic induction heating device can be independently started to accelerate molten steel to form spiral flow, and although the flow path of the molten steel is increased, the effect brought by the speed increase is more obvious, so that the average residence time of the molten steel is reduced, the floating of inclusions is not facilitated, the inclusions are deposited on the inner wall of the induction heating channel, and the inclusions are removed. The electromagnetic speed reducer is started when the electromagnetic induction heating is started, so that the flow speed of molten steel can be effectively reduced, but the molten steel in the channel still flows in a spiral manner, namely, the speed of the molten steel is reduced when the moving path of the molten steel is increased, and the average residence time of the molten steel is prolonged.
As shown in fig. 7a and 7b, it can be seen that after the electromagnetic induction heating device is simultaneously turned on and the electromagnetic speed is reduced, the inclusions in the steel are obviously reduced, and the quality of the molten steel is improved.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. A tunnel heating and deceleration tundish apparatus comprising:
the device comprises an injection chamber, a gas inlet and a gas outlet, wherein the injection chamber receives molten steel, and at least two conveying ports are arranged at the bottom of the injection chamber;
the bottom surface of the distribution chamber is provided with at least one pouring outlet and a receiving port corresponding to the conveying port;
the two ends of the induction heating channel are respectively connected with the conveying port and the receiving port;
electromagnetic induction heating device and electromagnetic speed reducer, electromagnetic induction heating device and electromagnetic speed reducer all set up in on the induction heating passageway, electromagnetic induction heating device set up in induction heating passageway upper reaches is close to the annotate the flow chamber, electromagnetic speed reducer set up in induction heating passageway low reaches is close to the distribution chamber.
2. The tunnel heating and decelerating tundish device as claimed in claim 1, wherein the electromagnetic induction heating device comprises a first iron core having a ring shape and a first electromagnetic coil wound on the first iron core, and the axis of the first iron core coincides with the axis of the induction heating tunnel.
3. A tunnel heating and decelerating tundish device according to claim 2, wherein when there are two parallel induction heating tunnels, the first electromagnetic coils of the two electromagnetic induction heating devices are wound around the adjacent edges of the two first iron cores, and the two electromagnetic induction heating devices are located on the same plane.
4. A tunnel heating and decelerating tundish device as claimed in claim 2 or 3, wherein the electromagnetic decelerating device comprises a pair of second iron cores symmetrically arranged at both sides of the induction heating tunnel and second electromagnetic coils wound around the second iron cores, and the adjacent sides of the two second iron cores are opposite.
5. A tunnel heating and decelerating tundish device as claimed in claim 4, wherein the surface of the second core cooperating with the induction heating tunnel is rectangular or arc-shaped to fit the induction heating tunnel.
6. The tunnel heating and decelerating tundish device as claimed in claim 5, wherein the first electromagnetic coil is located at one side of the symmetry plane of the two second cores, and the distance between the first electromagnetic coil and the symmetry plane is greater than the distance between the second cores and the symmetry plane.
7. The tunnel heating and decelerating tundish device as claimed in claim 6, wherein the second electromagnetic coil of the electromagnetic decelerating device has a height not smaller than the height of the induction heating tunnel, and the length of the electromagnetic decelerating device is not longer than 1/3 of the horizontal length of the induction heating tunnel.
8. The tunnel heating and decelerating tundish device as claimed in claim 7, wherein the power of the electromagnetic induction heating device and the power of the electromagnetic decelerating device satisfy the following conditions:
p h ＝λ 1 p b or (b)
Wherein p is h For the power of the electromagnetic induction heating device, p b Lambda is the power of the electromagnetic speed reducer 1 For the first correction coefficient, the value range is 1-3 lambda 2 For the second correction coefficient, the value range is 0.5-0.8, v x V is the axial average flow velocity of molten steel r Is the average speed of molten steel in the circumferential direction.
9. A tunnel heating and decelerating tundish device as claimed in claim 8, wherein the magnetic induction of the electromagnetic decelerating device satisfies the following formula:
wherein ρ is the density of molten steel, u is the flow rate of molten steel, N is the magnetic interaction parameter, the value range is 3-7, σ is the conductivity, and D is the channel diameter.
10. A control method using the tunnel heating and decelerating tundish device as claimed in any one of claims 1 to 9, comprising the steps of:
1) In the initial stage of pouring, after molten steel enters a tundish from a ladle, the molten steel firstly reaches a flow injection chamber, flows through an induction heating channel and then reaches a distribution chamber;
2) The electromagnetic induction heating device can be started after the liquid level of molten steel in the pouring flow chamber passes through the channel, and the electromagnetic speed reducing device is started at the same time;
3) After the last ladle is poured, the electromagnetic induction heating device and the electromagnetic speed reducing device firstly increase the power along with the reduction of the liquid level in the tundish, and the electromagnetic induction heating device and the electromagnetic speed reducing device are simultaneously closed after the liquid level of molten steel is lower than the induction heating channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310501781.1A CN116493583A (en) | 2023-05-06 | 2023-05-06 | Channel type heating and decelerating tundish device and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310501781.1A CN116493583A (en) | 2023-05-06 | 2023-05-06 | Channel type heating and decelerating tundish device and control method |
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| CN116493583A true CN116493583A (en) | 2023-07-28 |
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| CN202310501781.1A Pending CN116493583A (en) | 2023-05-06 | 2023-05-06 | Channel type heating and decelerating tundish device and control method |
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| Country | Link |
|---|---|
| CN (1) | CN116493583A (en) |
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2023
- 2023-05-06 CN CN202310501781.1A patent/CN116493583A/en active Pending
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