KR101225266B1 - apparatus and method for removing inclusions attached to submerged entry nozzle of tundish - Google Patents

apparatus and method for removing inclusions attached to submerged entry nozzle of tundish Download PDF

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Publication number
KR101225266B1
KR101225266B1 KR1020100094681A KR20100094681A KR101225266B1 KR 101225266 B1 KR101225266 B1 KR 101225266B1 KR 1020100094681 A KR1020100094681 A KR 1020100094681A KR 20100094681 A KR20100094681 A KR 20100094681A KR 101225266 B1 KR101225266 B1 KR 101225266B1
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South Korea
Prior art keywords
casting speed
inclusions
stopper
immersion nozzle
argon
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KR1020100094681A
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Korean (ko)
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KR20120033082A (en
Inventor
기웅간
홍용희
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현대제철 주식회사
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Priority to KR1020100094681A priority Critical patent/KR101225266B1/en
Publication of KR20120033082A publication Critical patent/KR20120033082A/en
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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention relates to a device for removing the inclusion inclusions and removal method of the tundish immersion nozzle, when the control unit 40 determines that the casting speed is slower than normal through the casting speed measuring device 50, the fine powder for removing argon gas and inclusions (Adhesive inclusion low melting point oxide) is introduced into the immersion nozzle through the through hole 3a of the stopper.
Thus, the melting point of the attachment inclusions decreases and is melted by the molten steel to be removed from the wall surface of the immersion nozzle.
Since the attachment inclusions of the immersion nozzle can be removed without interrupting the playing operation, there is an effect of increasing the number of years.

Description

Apparatus and method for removing inclusions attached to submerged entry nozzle of tundish}

The present invention relates to a device and a method for removing the attachment inclusions of the tundish immersion nozzle for removing the attachment inclusions that are attached to the inside of the immersion nozzle of the play equipment tundish.

In the steel mill, molten steel produced through the steelmaking process is continuously cast using the performance equipment.

The tundish is installed at the upper part of the performance equipment, and receives molten steel from the ladle and supplies molten steel to the mold installed at the lower part through the immersion nozzle.

The molten steel supplied to the mold is discharged to the lower part of the mold as the surface is solidified, and then formed into intermediate products such as slabs, beam blanks, billets, etc., passing through a plurality of rolling rolls through the strands.

On the other hand, the molten steel includes a number of non-metallic inclusions.

It is an object of the present invention to provide an apparatus and a method for removing an attachment inclusion of a tundish immersion nozzle which can prevent clogging of the immersion nozzle by removing the attachment inclusion attached to the inner wall of the immersion nozzle.

Apparatus for removing the attachment inclusions of the tundish immersion nozzle according to the present invention for achieving the above object,

A stopper having a through hole formed therein;

An argon gas tank connected to the through hole by an argon supply pipe;

A differential hopper connected to the through hole by a differential supply pipe, wherein the differential supply pipe is connected to the argon supply pipe and an argon branch pipe;

It includes.

In addition, the through hole is characterized in that each formed of a through hole connected to the argon supply pipe, and a through hole connected to the differential supply pipe.

In addition, the present invention is the electronic control valve installed in the argon supply pipe and the argon branch pipe, respectively;

A control unit for controlling the operation of the electronic control valve;

Casting speed measuring device for providing the casting speed determination information to the control unit;

It further includes a stopper driving device controlled by the control unit for lifting the stopper.

In addition, the casting speed measuring device is characterized in that the casting speed sensor for measuring the moving speed of the casting.

In addition, the casting speed measuring device is characterized in that the tundish weight sensor for measuring the weight of the tundish.

On the other hand, the method of removing the attachment inclusions of the tundish immersion nozzle according to the present invention includes a first casting speed determination step of measuring the casting speed by the casting speed measuring apparatus and determining whether the casting speed is within the set normal range; A stopper raising step of operating the stopper driving device to raise the stopper when the casting speed is not within the normal range; A second casting speed judging step of determining again whether the casting speed is within the normal range after raising the stopper; A stopper lowering step of lowering the stopper to a position close to the immersion nozzle when the slab speed transmitted from the casting speed measuring device in the second casting speed determining step is less than the normal range; A fine powder input step of opening an argon supply pipe and an electronic control valve of an argon branch pipe, supplying fine powder for removing argon gas and inclusions to the immersion nozzle through the stopper to melt and remove the inclusions attached to the immersion nozzle; A third casting speed judging step of determining again whether or not the casting speed is returned to the normal range after performing the fine powder input step S5 for removing the inclusions; And a fine feeding stop step of stopping the feeding of the fines for removing inclusions by closing the electronic control valve when it is determined that the casting speed is returned to the normal range in the third casting speed judging step (S6).

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In addition, when it is determined that the casting speed is not normal in the third casting speed determination step, it is characterized in that the differential injection return step of returning to the fine powder injection step for removing the inclusions.

In addition, the fine powder for removing inclusions is Al 2 O 3 Low melting point oxide,

CaO, SiO 2 , B 2 O 3 , Na 2 O, CaF 2 It is characterized in that any one or a mixture thereof.

According to the present invention as described above,

Since it is possible to remove the inclusions attached to the immersion nozzle without stopping the continuous casting, there is no need to stop the performance of the operation for removing the inclusion inclusions, there is an effect that increases the number of years.

In addition, by being able to remove the adhesion inclusions and the inclusions in the tundish molten steel to reduce the contamination of the cast steel to improve the cast quality.

1 is a immersion nozzle and stopper installation state of the tundish,
2 is a block diagram of the attachment inclusion removal device of the tundish immersion nozzle according to the present invention,
3 is another embodiment of the stopper of one configuration of the present invention;
Figure 4 is a flow chart of the method of removing the attachment inclusions of the tundish immersion nozzle according to the present invention.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

As illustrated in FIG. 1, an immersion nozzle 2 for discharging molten steel is installed at a lower portion of the tundish 1, and a stopper 3 is installed at an upper portion of the immersion nozzle 2.

The stopper 3 is connected to the stopper arm 4, and the stopper arm 4 is capable of lifting up and down by the cylinder 5.

Accordingly, by operating the cylinder 5 to adjust the up and down position of the stopper 3, the immersion nozzle 2 is opened or closed, or the opening degree thereof is adjusted to adjust the molten steel supply to the mold.

2, a stopper 3 having a vertical through hole 3a formed therein, an argon gas tank 10 connected to the through hole 3a by an argon supply pipe 11, and the through It includes a fine hopper 20 for removing the inclusions connected to the hole (3a) by the differential supply pipe (21).

The end of the through hole (3a) is reduced in diameter so that the argon gas and fine powder can be smoothly discharged into the molten steel to form a nozzle hole (3aa).

An argon branch pipe 12 connecting the argon supply pipe 11 and the differential supply pipe 21 is installed in order to discharge the fine powder from the inclusion pulverization pulverization hopper 20 through the differential supply pipe 21.

The argon supply pipe 11 and the argon branch pipe 12 are provided with electronic control valves 15 and 25, respectively.

The electronic control valves 15 and 25 are operated and controlled by the controller 40.

The control unit 40 is connected to the casting speed measuring device 50, the casting speed measuring device is installed around the strands or rolling roller table of the machine to measure the moving speed of the cast steel, or casting is in progress By using a tundish weight sensor to measure the weight loss of the tundish according to the decrease of the molten steel.

The stopper 3 is operated up and down by the stopper driving device 30. The stopper driving device 30 is lifted by the cylinder 5 and the cylinder 5, as described above. (4).

The stopper drive device 30 is operationally controlled by the control unit 40.

That is, the controller 40 determines that the inclusion is attached to the immersion nozzle 2 when the speed of the cast steel decreases from the normal range according to the information transmitted from the casting speed measuring apparatus 50, and the stopper driving device 30 ) To bring the stopper 3 close to the immersion nozzle 2.

In addition, the controller 40 opens the electronic control valves 15 and 25 so that argon gas can flow through the argon supply pipe 11 and the argon branch pipe 12.

Therefore, since the argon gas supplied through the argon branch pipe 12 flows to the fine powder supply pipe 21 at a high speed, the fine powder in the fine powder hopper 20 for removing inclusions is sucked into the fine powder supply pipe 21 to stop the stopper. It is supplied to the through hole 3a of (3).

That is, the argon gas is used as a conveying gas of the fine powder for removing the inclusions.

Therefore, argon gas and fine powder for removing inclusions are mixed in the through hole 3a, and the argon gas and fine powder are injected into the immersion nozzle 2 through the nozzle hole 3aa.

The fine powder for removing inclusions is a low-melting oxide that lowers the melting point of the inclusions, considering that Ca 2 , SiO 2 , B 2 O 3 , and Na 2 are considered to be Al 2 O 3 . Al 2 O 3 low melting point oxides such as O and CaF 2 are used.

The low melting point oxides may be used alone or in a mixture thereof.

Therefore, when the argon gas and the low melting point oxide are supplied into the immersion nozzle 2 as described above, the melting point of the deposition inclusion is lowered to 1500 ° C. or less, which is lower than the temperature of the molten steel (1600 ° C.). It is removed from the inner wall of (2).

As described above, the inclusions attached to the immersion nozzle can be removed even while the casting is continued, thereby eliminating the need to stop the casting to remove the attachment inclusions, thereby increasing the number of soft drinks.

In addition, slab contamination by the attachment inclusions is reduced.

On the other hand, the control unit 40 operates the stopper drive device 30 to raise the stopper 3 to close the electronic control valve 25 of the argon branch pipe 12 and the argon supply pipe 11 The solenoid control valve 15 is opened to supply only argon gas to the molten steel through the through-hole 3a, so that the argon gas is floated to the upper part of the molten steel in the tundish 1 without spraying the argon gas into the immersion nozzle. Can be removed. As a result, the amount of inclusions in the molten steel is reduced, thereby preventing the adhesion of inclusions on the inner wall of the immersion nozzle and improving the quality of the cast steel.

Meanwhile, as shown in FIG. 3, two through holes 3b and 3c may be formed in the stopper 3.

The argon supply pipe 11 and the differential supply pipe 21 are connected to the through holes 3b and 3c, respectively, so that they may be used as an argon supply pipe and a differential supply pipe.

The nozzle holes 3ba and 3ca having a reduced diameter are formed at the lower ends of the through holes 3b and 3c.

Now, a method of removing the adhesion inclusion according to the present invention will be described.

As shown in Figure 4, the attachment inclusion removal method according to the invention, the first casting speed determination step (S1), the stopper ascending step (S2), the second casting speed determination step (S3) and the stopper lowering A step S4, a fine powder input step for removing inclusions (S5), a third casting speed determination step S6, and a fine powder input step for stopping inclusions (S7) are included.

In the first casting speed judging step (S1), the moving speed or the tundish weight of the slab is sensed through a slab speed sensor or a tundish weight sensor, and the moving speed and the tundish weight reduction of the slab are normal. Determine if casting speed is normal.

If the casting speed is not normal, the stopper driving device 30 is operated to perform the stopper raising step S2 of raising the stopper 3.

After raising the stopper 3, the second casting speed determination step S3 is performed to determine whether the casting speed is normal by the above method.

If the casting speed returns to the normal range, the size of the inclusions in the immersion nozzle is insignificant and the operation speed is regarded as the case where the casting speed is reduced due to problems in the rear end equipment of the equipment.

On the other hand, in the second casting speed determination step (S3), if it is determined that the casting speed is not normal, the stopper lowering step (S4) for lowering the stopper 3 to a position close to the immersion nozzle (2). The stopper 3 may be lowered completely to the immersion nozzle 2 blocked state.

Subsequently, the argon supply pipe 11 and the electronic control valves 15 and 25 of the argon branch pipe 12 are opened to remove argon gas and inclusions into the immersion nozzle 2 through the stopper 3. Supply (put fine powder for removing inclusions (S5))

The fine powder used in the fine powder removal step (S5) for removing the inclusions is Al 2 O 3 as a low melting point oxide, as described in the above removal apparatus, among CaO, SiO 2 , B 2 O 3 , Na 2 O, and CaF 2 . Either one or a mixture thereof.

When the fine powder is added, the melting point of the adhesion inclusion decreases due to the low melting point of the adhesion inclusion of the fine powder. Thus, the adhesion inclusion is melted by the temperature of the molten steel, and is blown into the argon gas to be removed to the outside of the immersion nozzle 2.

Thereafter, the third casting speed determination step S6 is performed to determine whether the casting speed is returned to normal.

When the casting speed is returned to normal, the attachment inclusions of the immersion nozzle are successfully removed, and thus the differential injection is stopped by performing the differential injection stop step (S7) to lock the electronic control valves 15 and 25.

On the other hand, if it is determined that the casting speed is still not normal in the third casting speed judging step (S6), and performs the fine powder injection return step (S6-1) to repeat the fine powder input step (S5) for removing inclusions.

According to the method of removing the inclusion inclusions of the immersion nozzle as described above, it is determined whether continuous casting is normally performed by using the attachment inclusion removal device of the immersion nozzle, otherwise the fine particles for removing the attachment inclusions (low melting point oxide) By lowering the melting point of the attachment inclusions, it is possible to successfully remove the attachment inclusions from the immersion nozzle.

In addition, since the attachment inclusion removal operation as described above can be performed without stopping the continuous casting, it is a great help to increase the number of years.

1: tundish 2: immersion nozzle
3: stopper 3a, 3b, 3c: through hole
3aa, 3ba, 3ca: nozzle ball 4: stopper arm
5: cylinder 10: argon gas tank
11: argon supply pipe 12: argon branch pipe
15,25: Electronic control valve 20: Differential hopper for removing inclusions
21: differential supply pipe 30: stopper drive device
40: control unit 50: casting speed measuring device

Claims (8)

A stopper having a through hole formed therein;
An argon gas tank connected to the through hole by an argon supply pipe;
A differential hopper connected to the through hole by a differential supply pipe, wherein the differential supply pipe is connected to the argon supply pipe and an argon branch pipe;
Attachment removal device of the tundish immersion nozzle comprising a. The method according to claim 1,
And a through hole connected to the argon supply pipe and a through hole connected to the differential supply pipe, respectively. The method according to claim 1,
An electronic control valve installed in the argon supply pipe and the argon branch pipe, respectively;
A control unit for controlling the operation of the electronic control valve;
Casting speed measuring device for providing the casting speed determination information to the control unit;
And a stopper driving device controlled by the controller to lift and lower the stopper. The method according to claim 3,
The casting speed measuring device is attached to the removal apparatus of the tundish immersion nozzle, characterized in that the slab speed sensor for measuring the moving speed of the cast steel. The method according to claim 3,
The casting speed measuring apparatus is attached to the removal device of the tundish immersion nozzle, characterized in that the tundish weight sensor for measuring the weight of the tundish. A first casting speed determining step (S1) of measuring a casting speed by a casting speed measuring device and determining whether the casting speed is within a set normal range;
A stopper raising step (S2) of operating the stopper driving device to raise the stopper when the casting speed is not in the normal range;
A second casting speed determining step (S3) of determining again whether the casting speed is within the normal range after raising the stopper;
A stopper lowering step (S4) of lowering the stopper to a position close to the immersion nozzle when the slab speed transmitted from the casting speed measuring device in the second casting speed judging step (S3) is less than the normal range;
Opening of the electronic control valve of the argon supply pipe and the argon branch pipe, supplying fine powder for removing argon gas and inclusions to the immersion nozzle through the stopper, and then inserting fine powder for removing inclusions to melt and remove the inclusions attached to the immersion nozzle (S5). Wow;
A third casting speed determining step (S6) of determining whether or not the casting speed is returned to the normal range after the fine powder feeding step (S5) for removing the inclusions;
In the third casting speed judging step (S6), if it is determined that the casting speed is returned to the normal range, the fine powder injection stop step (S7) to stop the injection of the fines for removing the inclusions by closing the electronic control valve;
Attachment removal method of the tundish immersion nozzle comprising a. The method of claim 6,
When it is determined that the casting speed is not normal in the third casting speed determination step (S6), the turn, characterized in that to perform a differential feed return step (S6-1) to return to the fine powder injection step (S5) for removing the inclusions How to remove attachment inclusions of dish immersion nozzle. The method of claim 6,
The fine powder for removing inclusions is an Al 2 O 3 low melting point oxide,
A method for removing adhesion inclusions in a tundish immersion nozzle, characterized in that any one or a mixture of CaO, SiO 2 , B 2 O 3 , Na 2 O, CaF 2 .

KR1020100094681A 2010-09-29 2010-09-29 apparatus and method for removing inclusions attached to submerged entry nozzle of tundish KR101225266B1 (en)

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KR101225266B1 true KR101225266B1 (en) 2013-01-25

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1043845A (en) 1996-07-31 1998-02-17 Nippon Steel Corp Method for continuously casting molten metal
JP2003245759A (en) 2002-02-27 2003-09-02 Jfe Steel Kk Forcibly opening method of tundish nozzle for continuous casting and device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1043845A (en) 1996-07-31 1998-02-17 Nippon Steel Corp Method for continuously casting molten metal
JP2003245759A (en) 2002-02-27 2003-09-02 Jfe Steel Kk Forcibly opening method of tundish nozzle for continuous casting and device

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