CN110918961A - Induction heating channel and tundish beneficial to removing inclusions in molten steel - Google Patents
Induction heating channel and tundish beneficial to removing inclusions in molten steel Download PDFInfo
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- CN110918961A CN110918961A CN201911345005.7A CN201911345005A CN110918961A CN 110918961 A CN110918961 A CN 110918961A CN 201911345005 A CN201911345005 A CN 201911345005A CN 110918961 A CN110918961 A CN 110918961A
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- channel
- induction heating
- molten steel
- heating channel
- inclusions
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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
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Abstract
The invention discloses an induction heating channel and a tundish beneficial to removing inclusions in molten steel, which comprise a long nozzle, an injection chamber, an induction heating channel, an inner channel, an air blowing opening, an induction coil, an iron core, a pouring chamber and an immersion nozzle, wherein the long nozzle is arranged at the central position of the top end of the injection chamber; the bottom of induction heating passageway is provided with the mouth of blowing, and induction coil and iron core are provided with around the inboard of induction heating passageway. Has the advantages that: the heating channel is provided with a backflow section, so that the residence time of molten steel in the channel is prolonged, and the floating probability of inclusions in the molten steel in the pipeline is increased.
Description
Technical Field
The invention relates to the technical field of steelmaking and continuous casting equipment, in particular to an induction heating channel and a tundish which are beneficial to removing inclusions in molten steel.
Background
In the process of steel-making continuous casting production, the tundish is used as an important metallurgical reaction vessel and has important functions of continuous casting, pressure reduction, shunt, protection, inclusion removal and the like. However, in the steel-making process, the molten steel has certain heat loss when passing through the tundish, and the temperature fluctuates to some extent, so that the quality of the casting blank cannot be ensured to a certain extent. On the other hand, the tundish is the final link for removing inclusions before molten steel solidification. Although the floating of inclusions can be promoted by optimizing the flow of molten steel in the tundish, the slag entrapment is easy to generate, and great negative effects are generated on products. Modern metallurgy pays more and more attention to the quality of steel, and in order to meet the requirements of continuous casting technology production, homogenize the temperature of molten steel and further improve the removal efficiency of inclusions, the technology of tundish channel type electromagnetic induction heating and inclusion removal in steel is developed and applied.
Since the eighties to the ninety years of the twentieth century, channel-type electromagnetic induction heating apparatuses have been widely used in industrial production at home and abroad. But present induction heating passageway is mostly two kinds of single channel or binary channels formula, and the tiling is in the middle of the package bottom, and electromagnetic induction's "pinch effect" makes the inclusion gather and accumulate at the passageway wall, and the inclusion that accumulates for a long time can drop under the scouring that the molten steel flows in the passageway to along with the molten steel gets into middle package pouring chamber. Such detached inclusions are generally large in size and cause great damage to the quality of steel products. In arrangement, the electromagnetic induction heating device occupies a certain area, and the heating channel is not too long in consideration of the reasonability of the overall layout of the tundish and the space utilization rate. Therefore, in order to obtain better heating efficiency, improve the removal efficiency of the inclusions and further improve the quality of the continuous casting billet, the invention redesigns and arranges the channels for the induction heating of the tundish and the removal of the inclusions.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the induction heating channel and the tundish which are beneficial to removing inclusions in molten steel, has the advantages of compact structure and convenient arrangement and maintenance, and further solves the problem that the traditional induction heating channel is complex in structure and inconvenient to maintain.
(II) technical scheme
In order to realize the advantages of compact structure and convenient arrangement and maintenance, the invention adopts the following specific technical scheme:
an induction heating channel and a tundish which are beneficial to removing impurities in molten steel comprise a long nozzle, an injection chamber, an induction heating channel, an inner channel, an air blowing opening, an induction coil, an iron core, a casting chamber and an immersion nozzle, wherein the long nozzle is arranged at the central position of the top end of the injection chamber, the induction heating channel is arranged on one side of the injection chamber, the inner channel is arranged at the bottom of one end, away from the injection chamber, of the induction heating channel, the end, away from the induction heating channel, of the inner channel is communicated with the casting chamber, and the immersion nozzle is symmetrically arranged at the bottom end of the casting chamber; the bottom of induction heating passageway is provided with the mouth of blowing, induction coil and iron core are provided with around the bottom of induction heating passageway.
As an improvement, the induction heating channel comprises an upper channel, an arc-shaped channel is arranged at one end, far away from the injection chamber, of the upper channel, the arc-shaped channel is far away from one end of the upper channel and is positioned below the upper channel, a lower channel is arranged below the upper channel, and the horizontal length of the induction heating channel is 80-100cm, so that after molten steel and inclusions are separated for the first time under the action of electromagnetic force, the molten steel flows back to the injection chamber through the upper channel and flows into the induction heating channel again for further separation, and the removal efficiency of the inclusions in the molten steel can be improved.
As an improvement, the upper channel inclines 15-30 degrees to the lower right, so that molten steel and inclusions can rise under the drive of bubbles and flow into the upper channel along the arc-shaped channel, and the lower channel inclines 15-30 degrees to the upper right, so that the molten steel carrying the inclusions can flow back to the injection chamber.
As an improvement, the upper channel, the arc-shaped channel, the lower channel and the injection chamber are communicated to form a complete molten steel circulating flow loop, so that the induction heating channel is provided with a backflow section, the retention time of molten steel in the channel is prolonged, and the floating probability of inclusions in the molten steel in the pipeline is increased.
As an improvement, the diameter of the inner channel is 6-10cm, and the inner channel is arranged along the axis of the lower channel, so that under the action of electromagnetic force, molten steel moves towards the center of the channel, and inclusions move towards opposite directions under the action of reaction force, so that the molten steel with cleaner middle part flows into the pouring chamber through the inner channel, the purity of the molten steel in the pouring chamber is further improved, and the quality of the poured casting blank is further improved.
As an improvement, the gas blown in by the gas blowing opening is inert gas argon, and the blowing flow rate of the gas blowing opening is 20-40L/min, so that the inert gas can be blown in the induction heating channel by the gas blowing opening, the generated bubbles drive the molten steel to flow back to the injection chamber, meanwhile, inclusions in the molten steel are promoted to float upwards, the aggregation and growth of the inclusions are facilitated, and finally the inclusions reach the upper part of the injection chamber along with the molten steel under the drive of the bubbles and are adsorbed and removed by the protective slag.
(III) advantageous effects
Compared with the prior art, the invention provides the induction heating channel and the tundish which are beneficial to removing the impurities in the molten steel, and the induction heating channel and the tundish have the following beneficial effects:
(1) thereby make simple structure compact, reasonable in design, area is few, arranges and overhauls convenient relatively, and the heating channel of new design has the backward flow section, has prolonged the dwell time of molten steel in the passageway, increases the probability of inclusion come-up in the molten steel in the pipeline, can realize pouring basket constant temperature pouring simultaneously, improves heating and edulcoration efficiency, reaches effectively to improve continuous casting productivity ratio, further improves the purpose of casting blank quality.
(2) The upper channel and the lower channel of the induction heating channel are connected to form an integral channel, the upper channel is connected with the upper portion of the injection chamber, molten steel flows back to the injection chamber after being separated from inclusions under the action of electromagnetic force for the first time, and flows into the induction heating channel again for further separation, so that the removal efficiency of the inclusions in the molten steel can be improved.
(3) The inner channel is arranged at the bottom of the induction heating channel and is connected with the pouring chamber, under the action of electromagnetic force, molten steel moves towards the center of the channel, and inclusions move towards the opposite direction under the action of reaction force, so that the molten steel which is cleaner in the middle flows into the pouring chamber, the purity of the molten steel in the pouring chamber is improved, and the quality of the cast blank is further improved.
(4) The gas blowing port is newly added at the bottom end of the induction heating channel, inert gas is blown in, generated bubbles drive the molten steel to flow back to the injection chamber, simultaneously, inclusions in the molten steel are promoted to float upwards, aggregation of the inclusions is facilitated, and finally the inclusions are driven by the bubbles to reach the upper part of the injection chamber along with the molten steel and are adsorbed and removed by the protective slag.
(5) The induction heating channel with the brand-new design is provided with a backflow section, so that the retention time of molten steel in the channel is prolonged, and the floating probability of inclusions in the molten steel in the pipeline is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of an induction heating channel and a tundish for facilitating the removal of inclusions from molten steel according to an embodiment of the present invention;
FIG. 2 is a schematic view of a tundish induction heating channel configuration useful for removing inclusions from molten steel in accordance with an embodiment of the present invention;
FIG. 3 is a second schematic structural view of an induction heating channel and a tundish for removing inclusions from molten steel according to an embodiment of the present invention.
In the figure:
1. a long nozzle; 2. an injection chamber; 3. an induction heating channel; 301. an upper channel; 302. an arc-shaped channel; 303. a lower channel; 4. an inner channel; 5. an air blowing port; 6. an induction coil and an iron core; 7. a pouring chamber; 8. a submerged entry nozzle.
Detailed Description
For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the invention, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.
According to the embodiment of the invention, the induction heating channel and the tundish which are beneficial to removing the inclusions in molten steel are provided.
Referring to the drawings and the detailed description, as shown in fig. 1-3, an induction heating channel and a tundish which are beneficial to removing inclusions in molten steel according to an embodiment of the present invention include a long nozzle 1, an injection chamber 2, an induction heating channel 3, an inner channel 4, an air blowing port 5, an induction coil and iron core 6, a casting chamber 7 and an immersion nozzle 8, the long nozzle 1 is disposed at a central position of a top end of the injection chamber 2, the induction heating channel 3 is disposed at one side of the injection chamber 2, the inner channel 4 is disposed at a bottom of one end of the induction heating channel 3, which is far from the injection chamber 2, the one end of the inner channel 4, which is far from the induction heating channel 3, is communicated with the casting chamber 7, and the immersion nozzle 8 is symmetrically disposed at a bottom end of the casting chamber 7; the bottom of induction heating passageway 3 is provided with gas blowing port 5, induction coil and iron core 6 are provided with around the bottom of induction heating passageway 3.
By means of the scheme, the structure is simple and compact, the design is reasonable, the occupied area is small, the arrangement and the maintenance are relatively convenient, meanwhile, the newly designed heating channel is provided with the backflow section, the retention time of molten steel in the channel is prolonged, and the floating probability of inclusions in the molten steel in the pipeline is increased.
During specific implementation, the induction heating channel 3 comprises an upper channel 301, an arc-shaped channel 302 is arranged at one end, far away from the injection chamber 2, of the upper channel 301, the arc-shaped channel 302 is far away from one end of the upper channel 301 and is located below the upper channel 301, a lower channel 303 is arranged below the upper channel 301, and the horizontal length of the induction heating channel 3 is 80-100cm, so that after molten steel and inclusions are separated for the first time under the action of electromagnetic force, the molten steel flows back to the injection chamber 2 through the upper channel 301 and then flows into the induction heating channel 3 again for further separation, and the removal efficiency of the inclusions in the molten steel can be improved.
In specific implementation, the upper channel 301 is inclined 15-30 degrees towards the lower right side, and the lower channel 303 is inclined 15-30 degrees towards the upper right side, so that molten steel and inclusions can rise under the driving of bubbles and flow into the upper channel along the arc-shaped channel, and the molten steel carrying the inclusions can flow back to the injection chamber.
In specific implementation, the upper channel 301, the arc-shaped channel 302, the lower channel 303 and the injection chamber 2 are communicated to form a complete molten steel circulating loop, so that the induction heating channel 3 has a backflow section, the residence time of molten steel in the channel is prolonged, and the floating probability of inclusions in the molten steel in the pipeline is increased.
During specific implementation, the diameter of the inner channel 4 is 6-10cm, the inner channel 4 is arranged along the axis of the lower channel 303, so that molten steel moves towards the center of the channel under the action of electromagnetic force, and inclusions move towards opposite directions under the action of reaction force, so that the molten steel with a cleaner middle part flows into the pouring chamber 7 through the inner channel 4, the purity of the molten steel in the pouring chamber 7 is further improved, and the quality of a poured casting blank is further improved.
During specific implementation, the gas blown in by the air blowing port 5 is inert gas argon, and the blowing flow of the air blowing port 5 is 20-40L/min, so that the inert gas can be blown into the induction heating channel 3 from the air blowing port 5, the generated bubbles drive the molten steel to flow back to the injection chamber 2, meanwhile, inclusions in the molten steel are promoted to float upwards, aggregation and growth of the inclusions are facilitated, and finally the inclusions reach the upper part of the injection chamber 2 along with the molten steel under the driving of the bubbles and are adsorbed and removed by the protective slag.
The working principle is as follows: molten steel flows into the injection chamber 2 from the long nozzle 1, the molten steel in the injection chamber 2 and the induction heating channel 3 forms a closed loop, under the action of a magnetic field generated by the induction coil and the iron core 6, currents are induced in the induction heating channel 3 and the inner channel 4 to generate joule heat, so that the molten steel in the induction heating channel 3 has a good heating effect, the electromagnetic force is utilized to carry out 'pinch effect' on the molten steel, the molten steel which is stressed in an unbalanced manner rotates strongly in the induction heating channel 3, the molten steel moves to the center under the action of the pinch force, inclusions with small density and poor conductivity move and gather on the wall surface of the induction heating channel 3 under the action of reaction force, so that the central part of the induction heating channel 3 is relatively pure, the inclusions in peripheral molten steel are concentrated and enter between the induction heating channel 3 and the inner channel 4 along with forward flowing of the molten steel, and the pure molten steel in the central part of the induction heating channel 3 flows into, the purer molten steel entering the pouring chamber 7 is poured next through the submerged nozzle 8, inert gas argon is blown in through the air blowing port 5 at the bottom of the lower channel 303 of the induction heating channel 3, the molten steel gathered by inclusions between the induction heating channel 3 and the inner channel 4 flows upwards along the induction heating channel 3 under the drive of molten steel density difference caused by induction heating and blown-in gas, and flows back to the pouring chamber 2, the inclusions in the returned molten steel are adsorbed by bubbles formed by the gas blown in through the air blowing port 5 and return to the upper part of the pouring chamber 2 along with the molten steel through the induction heating channel 3, so that the inclusions are easily adsorbed and removed by top protective slag, the molten steel flowing back to the pouring chamber 2 through the induction heating channel 3 flows into the induction heating channel 3 again from the bottom end of the pouring chamber 2, and the circulation is repeated, the inclusions in the steel are removed to the maximum extent, and the temperature of the molten steel in the tundish is, the metallurgical effect of the tundish is obviously enhanced.
In summary, according to the above technical solution of the present invention, the upper channel 301, the arc-shaped channel 302, the lower channel 303 and the injection chamber 2 are communicated to form a complete molten steel circulation flowing loop, so that after molten steel and inclusions are separated for the first time under the action of electromagnetic force, the molten steel flows back to the injection chamber 2 through the upper channel 301, and then flows into the induction heating channel 3 again for further separation, thereby improving the removal efficiency of inclusions in molten steel. Through setting up gas blowing port 5, thereby make gas blowing port 5 can to blow in inert gas argon gas in the induction heating passageway 3, the bubble that produces drives the molten steel backward flow to pour into the room 2, promote the inclusion in the molten steel come up simultaneously, also be favorable to the gathering of inclusion to grow up, and final inclusion arrives along with the molten steel under the bubble drives pour into 2 upper portions in the room by the absorption of covering slag and get rid of. Through setting up interior passageway 4 to under the effect of electromagnetic force, the molten steel moves to the passageway center, and the inclusion moves towards opposite direction under the reaction force, therefore the more clear molten steel in middle part passes through interior passageway 4 flows in pouring chamber 7, and then has improved the purity of molten steel in pouring chamber 7, makes the casting blank quality of casting have further promotion. Therefore, the structure is simple and compact, the design is reasonable, the occupied area is small, the arrangement and the maintenance are relatively convenient, meanwhile, the newly designed heating channel is provided with a backflow section, the retention time of the molten steel in the channel is prolonged, and the floating probability of inclusions in the molten steel in the pipeline is increased.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. An induction heating channel and a tundish which are beneficial to removing inclusions in molten steel are characterized by comprising a long nozzle (1), an injection chamber (2), an induction heating channel (3), an inner channel (4), an air blowing opening (5), an induction coil, an iron core (6), a pouring chamber (7) and an immersion nozzle (8), wherein the long nozzle (1) is arranged at the center of the top end of the injection chamber (2), the induction heating channel (3) is arranged on one side of the injection chamber (2), the inner channel (4) is arranged at the bottom of one end, far away from the injection chamber (2), of the induction heating channel (3), the pouring chamber (7) is communicated with one end, far away from the induction heating channel (3), of the inner channel (4), and the immersion nozzle (8) is symmetrically arranged at the bottom end of the pouring chamber (7);
the bottom end of the induction heating channel (3) is provided with an air blowing opening (5), and the bottom of the induction heating channel (3) is provided with an induction coil and an iron core (6) in a surrounding mode.
2. The induction heating channel and the tundish for removing the inclusions in the molten steel according to claim 1, wherein the induction heating channel (3) comprises an upper channel (301), an arc-shaped channel (302) is arranged at one end of the upper channel (301) far away from the injection chamber (2), a lower channel (303) is arranged at one end of the arc-shaped channel (302) far away from the upper channel (301) and below the upper channel (301), and the horizontal length of the induction heating channel (3) is 80-100 cm.
3. The induction heating channel and tundish for removing inclusions in molten steel according to claim 2, wherein the upper channel (301) is inclined 15 to 30 degrees to the lower right and the lower channel (303) is inclined 15 to 30 degrees to the upper right.
4. An induction heating channel and tundish for inclusion removal from molten steel as claimed in claim 2 wherein the upper channel (301) and the arcuate channel (302) communicate with the lower channel (303) and the injector chamber (2) to form a complete molten steel circulation loop.
5. An induction heating channel and tundish for use in removing inclusions from molten steel as claimed in claim 2 wherein the diameter of the inner channel (4) is 6-10cm and the inner channel (4) is located along the axis of the lower channel (303).
6. The induction heating channel and the tundish beneficial to removing the inclusions in the molten steel according to claim 1, wherein the gas blown from the blowing ports (5) is inert gas, and the blowing flow rate of the blowing ports (5) is 20-40L/min.
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| CN201911345005.7A CN110918961B (en) | 2019-12-24 | 2019-12-24 | Induction heating channel and tundish beneficial to removing inclusions in molten steel |
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| CN110918961B CN110918961B (en) | 2021-10-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112893792A (en) * | 2021-01-14 | 2021-06-04 | 东北大学 | Device and method for improving channel type induction heating speed and impurity removal rate |
| CN114101650A (en) * | 2021-11-26 | 2022-03-01 | 东北大学 | Channel type induction heating device and tundish |
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| CN105149560A (en) * | 2015-10-23 | 2015-12-16 | 东北大学 | Tundish induction heating device having function of removing occluded foreign substances |
| CN105567908A (en) * | 2016-01-18 | 2016-05-11 | 东北大学 | Double-tube type electromagnetic induction RH device and method for heating molten steel and removing inclusions |
| CN110052596A (en) * | 2019-05-27 | 2019-07-26 | 东北大学 | Butterfly induction heating tundish |
| CN110394433A (en) * | 2019-08-21 | 2019-11-01 | 东北大学 | A kind of long nozzle ar blowing refining device and method effectively removing inclusions in tundish |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US3991263A (en) * | 1973-09-03 | 1976-11-09 | Allmanna Svenska Elektriska Aktiebolaget | Means for tapping |
| CN105149560A (en) * | 2015-10-23 | 2015-12-16 | 东北大学 | Tundish induction heating device having function of removing occluded foreign substances |
| CN105567908A (en) * | 2016-01-18 | 2016-05-11 | 东北大学 | Double-tube type electromagnetic induction RH device and method for heating molten steel and removing inclusions |
| CN110052596A (en) * | 2019-05-27 | 2019-07-26 | 东北大学 | Butterfly induction heating tundish |
| CN110394433A (en) * | 2019-08-21 | 2019-11-01 | 东北大学 | A kind of long nozzle ar blowing refining device and method effectively removing inclusions in tundish |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112893792A (en) * | 2021-01-14 | 2021-06-04 | 东北大学 | Device and method for improving channel type induction heating speed and impurity removal rate |
| CN114101650A (en) * | 2021-11-26 | 2022-03-01 | 东北大学 | Channel type induction heating device and tundish |
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| CN110918961B (en) | 2021-10-29 |
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