JP2018035382A - Gas feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas feeding device capable of continuously performing gas feed to the blow plug of a ladle.SOLUTION: Provided is a gas feeding device 1 comprising: a first piping 11; a second piping 12; and a third piping 13. The first piping 11 includes a first gas feed port 11a to be fed with a gas upon refining of a molten steel M stored into a ladle 2, and being the one for feeding the gas to a blow plug 2a fitted to the ladle 2. The second piping 12 includes: a pressure-accumulation cylinder 12c to be accumulated with the gas from the first gas feed port 11a; and a pressure regulation valve 12 as a gas regulation part for feeding a gas in an amount smaller than that of the first piping 11 from the pressure-accumulation cylinder 12c to the blow plug 2a. Then, the third piping 13 includes a second gas feed port 13a to be fed with the gas upon continuous casting in which the molten steel M in the ladle 2 is made to flow into a mold 4 via a tundish 3, and is connected to the second piping 12 at the gas upstream side than the pressure regulation valve 12b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas supply device for supplying gas to a blowing plug attached to a ladle containing molten steel.

  Conventionally, during refining of molten steel, an inert gas such as argon is supplied from a gas supply source to a blow plug provided at the bottom of the ladle to the molten steel contained in the ladle, and the molten steel in the ladle is supplied to the molten steel. A large amount of gas is blown out from the outlet of the blowing plug. During the refining of the molten steel, gas is supplied to the blow plug from the gas source of the refining facility.

  In order to continuously supply a small amount of gas to the blowing plug even after refining the molten steel, there is a gas supply device provided with a pressure accumulation cylinder in the middle of the gas supply path. This equipment stores a part of the gas supplied from the gas supply source during refining in the accumulator, and when refining is completed and the gas supply source is disconnected, the gas accumulated in the accumulator is continuously supplied to the plug. To do. This prevents molten steel from entering the gas blowing pores of the blowing plug and blocking the pores. This facilitates continuous reuse of the blowing plug of the gas supply device.

JP 2003-239010 A

  However, in the gas supply apparatus described above, if the continuous casting takes too much time due to some problem or the like, the gas in the pressure accumulation cylinder may be exhausted. In this case, there is a problem in that gas is not supplied from the pressure accumulation cylinder to the injection plug of the ladle during continuous casting, the molten steel entering the injection plug cannot be prevented, and the molten steel may enter the injection plug and be clogged. .

  This invention is made | formed in order to solve this subject, and it aims at providing the gas supply apparatus which can supply gas continuously to the blowing plug of a ladle longer.

  The gas supply device of the present invention made to solve the above-described object has a first gas supply port to which gas is supplied during refining of molten steel accommodated in a ladle, and a blower attached to the ladle A first pipe for supplying a gas to the plug, a pressure accumulation cylinder for storing the gas from the first gas supply port, and a gas adjusting unit for adjusting a flow rate of the gas supplied to the blowing plug; A second pipe for supplying a smaller amount of gas to the blowing plug, and a second gas supply port for supplying gas during continuous casting in which molten steel in the ladle is poured into the mold through the tundish, and gas adjustment And a third pipe connected to the second pipe on the gas upstream side of the section.

  According to this gas supply apparatus, when refining molten steel, the first gas supply port is connected to a gas supply source for refining, and a large amount of gas is supplied from the gas supply source for refining to the blowing plug through the first pipe. Then, the molten steel can be refined by discharging a large amount of gas into the molten steel from the outlet of the blow plug.

  During this refining, a part of the gas supplied from the gas supply source to the first pipe is supplied to the pressure accumulation cylinder through the second pipe, and a gas having a pressure equal to the gas pressure of the first pipe is stored in the pressure accumulation cylinder.

  When refining is completed and the first gas supply port is disconnected from the gas source, the gas stored in the pressure accumulation cylinder flows into the second pipe, and a smaller amount of gas is supplied to the blowing plug than the first pipe through the gas adjusting section. To do. As a result, the blowing plug continues to prevent the molten metal from entering the blowing plug and clogging the blowing plug with the gas pressure supplied from the second pipe.

  During this time, the ladle is moved from the refining place to the continuous casting place and attached to the continuous casting apparatus. A gas source in the continuous casting apparatus is coupled to the second gas supply port of the third pipe, and gas is supplied to the third pipe. The gas supplied to the third pipe supplies a small amount of gas to the blowing plug through the gas adjusting section of the second pipe. The small amount of gas supplied to the blow plug keeps preventing molten metal from entering the blow plug.

  A part of the gas supplied to the third pipe flows into the pressure accumulation cylinder, and a gas having a pressure equal to the gas pressure of the third pipe is held in the pressure accumulation cylinder.

  The gas held in the pressure accumulation cylinder is supplied to the blowing plug via the second pipe after the ladle is disconnected from the gas source at the continuous casting place, and prevents the molten metal from entering the blowing plug.

  By using a throttle valve having a narrow cross-sectional area of the gas supply path as the gas adjusting unit, the gas flow rate supplied to the blowing plug can be reliably reduced with a simple configuration. Further, as the gas adjusting unit, a pressure adjusting valve that can adjust the gas flow rate by adjusting the gas flow pressure, a flow rate adjusting valve that can control the gas flow rate, and the like may be used. Note that both the pressure adjustment valve and the flow rate adjustment valve can be used.

  Moreover, you may make it make the pipe diameter of 2nd piping for supplying a small amount of gas to a blowing plug at the time of continuous casting smaller than the pipe diameter of 1st piping. In this case, the gas supply amount to the blow plug at the time of continuous casting can be reduced with a simple configuration.

  Further, by providing the first check valve between the blowing plug and the first gas supply port in the first pipe, it is possible to prevent the gas from flowing back to the first gas supply port side. Further, by providing the second check valve in the second pipe, it is possible to prevent the gas from flowing back from the second pipe to the first pipe, and all the gas supplied from the pressure accumulation cylinder passes through the gas regulator and only a small amount of gas is supplied. Is sent to the blow plug. By providing the third check valve in the third pipe, it is possible to prevent the gas from flowing back to the second gas supply port side. These check valves prevent the gas from flowing back to the first gas supply port and the second gas supply port, and all the gas supplied from the pressure accumulation cylinder passes through the gas regulator, and a small amount of gas is blown into the plug for a long time. Can supply.

It is the schematic which shows the gas supply apparatus in 1st Embodiment of this invention. It is a figure which shows the gas supply apparatus in 1st Embodiment. It is a figure which shows a mode that the molten steel was accommodated in the ladle in 1st Embodiment. It is an enlarged view of the blowing plug in 1st Embodiment. It is a figure which shows the gas supply apparatus in 2nd Embodiment. It is a figure which shows the gas supply apparatus in 3rd Embodiment. It is a figure which shows the modification of a blowing plug.

[First Embodiment]
Hereinafter, the gas supply apparatus in 1st Embodiment of this invention is demonstrated with reference to FIGS. The gas supply apparatus 1 of this embodiment shown in FIG.1 and FIG.2 is an apparatus for supplying gas to the blowing plug 2a of the ladle 2. As shown in FIG.

  Specifically, the gas supply device 1 supplies a large amount of gas to the blowing plug 2a of the ladle 2 during refining of the molten steel M accommodated in the ladle 2, and the molten steel is supplied from the outlet 2b of the blowing plug 2a. A large amount of gas is blown into M. Thereby, the molten steel M is stirred and the refining of the molten steel M is performed. At the time of continuous casting after refining the molten steel M, a small amount of gas is supplied to the blowing plug 2a of the ladle 2. Thereby, the molten steel M is prevented from entering the blower outlet 2b of the blow plug 2a.

  The ladle 2 in which the molten steel M is accommodated is a container made of a refractory, and a blow plug 2a and a long nozzle 5 are provided side by side as shown in FIG. The blowing plug 2 a is for blowing gas into the molten steel M accommodated in the ladle 2. As the gas, for example, an inert gas such as argon is used.

  The blow plug 2a is formed of a refractory material and has a truncated cone shape. Moreover, as shown in FIG. 4, the blow plug 2a is provided with a plurality of slits 2c as gas flow paths for allowing gas to pass therethrough. The plurality of slits 2c penetrate the inside of the blowing plug 2a and form slit-like pores. The gas supplied to the blow plug 2a is discharged into the ladle 2 from the blow outlet 2b through the slit 2c.

  At the time of continuous casting, as shown in FIG. 2, the steel slab F is manufactured by pouring the molten steel M in the ladle 2 after refining into the mold 4 through the tundish 3. Here, the tundish 3 is a container into which the molten steel M refined in the ladle 2 is injected through the long nozzle 5. In the tundish 3, inclusions and the like of the molten steel M are removed. The long nozzle 5 is provided at the bottom of the ladle 2 and is used for pouring molten steel M refined in the ladle 2 into the tundish 3. The long nozzle 5 has a spout 5 a at its tip extending into the tundish 3. The molten steel M refined in the ladle 2 passes through the long nozzle 5 and is injected into the tundish 3 from the spout 5a.

  The molten steel M injected into the tundish 3 is poured into the mold 4 through the immersion nozzle 6 after inclusions and the like are removed. The immersion nozzle 6 is made of a refractory material and is provided at the bottom of the tundish 3. Moreover, the casting_mold | template 4 consists of copper etc., is water-cooled, and is for manufacturing the steel slab F of a desired shape, cooling the molten steel M poured in from the tundish 3. FIG. The molten steel M poured into the mold 4 is cooled and solidified by a cooling device (not shown), and further cooled while being supported by the guide roll 7 to promote solidification, and then transferred to a processing device (not shown). Go.

  Next, the gas supply apparatus 1 of this embodiment is demonstrated. As described above, the gas supply device 1 of the present embodiment shown in FIGS. 1 and 2 supplies a large amount of gas to the blowing plug 2a of the ladle 2 during refining, and the flow rate is controlled to the blowing plug 2a during continuous casting. A small amount of gas is supplied. As shown in FIG. 2, the gas supply device 1 of the first embodiment includes a first pipe 11, a second pipe 12, and a third pipe 13.

  The 1st piping 11 has the 1st gas supply port 11a connected to the gas supply source for refining which is not illustrated. The first pipe 11 is for supplying a large amount of gas from a gas supply source for refining to the blowing plug 2a during refining. The gas supplied to the 1st gas supply port 11a is supplied to the blowing plug 2a of the ladle 2 through the 1st piping 11, and is discharged into the ladle 2 from the blower outlet 2b through the slit 2c. Further, during refining, the gas supplied from the gas supply source to the first gas supply port 11 a is stored in the pressure accumulation cylinder 12 c through the second pipe 12.

  On the other hand, during continuous casting, the first gas supply port 11a of the first pipe 11 is removed from the gas supply source for refining. The first pipe 11 is provided with a first check valve 11b between the blow plug 2a and the first gas supply port 11a so that the gas does not flow backward to the first gas supply port 11a side during continuous casting. It has become.

  The second pipe 12 includes a second check valve 12a, a pressure adjustment valve 12b (corresponding to a gas adjustment unit), and a pressure accumulation tank 12c. The second pipe 12 is for supplying the gas from the gas supply source G for continuous casting to the blow plug 2a by controlling the flow rate by the pressure regulating valve 12b.

  The pressure adjustment valve 12b is disposed on the gas downstream side of the pressure accumulation cylinder 12c and adjusts the gas flow rate by adjusting the gas flow pressure. The pressure regulating valve 12b limits the flow rate so that the gas does not flow backward from the blowing plug 2a to the second pipe 12 during refining, and a small amount of gas from the gas supply source G or the pressure accumulation cylinder 12c to the blowing plug 2a during continuous casting. The gas flow rate is adjusted so that the gas is supplied. The pressure regulating valve 12b may be a throttle valve with a narrow cross-sectional area of the gas flow path.

  The pressure accumulation cylinder 12c is a container for storing gas, and stores gas from a gas supply source for refining during refining, and stores gas from a gas supply source G for continuous casting during continuous casting.

  A second check valve 12 a is disposed between the pressure adjustment valve 12 b and the first pipe 11 in the gas supply path of the second pipe 12. The second check valve 12a prevents gas from flowing back from the gas supply source G or the pressure accumulation cylinder 12c to the first gas supply port 11a side during continuous casting.

  The third pipe 13 has a second gas supply port 13a connected to the gas supply source G for continuous casting, and supplies gas from the gas supply source G to the second pipe 12 during continuous casting. Is to do. The third pipe 13 is connected to the second pipe 12 on the gas upstream side of the pressure regulating valve 12b. The gas supplied from the gas supply source G to the second gas supply port 13 a is supplied to the second pipe 12 through the third pipe 13.

  Next, a gas supply method using the gas supply device 1 of the present embodiment will be described. First, in the gas supply device 1 of the present embodiment, the first gas supply port 11a of the first pipe 11 is connected to a gas supply source for refining during refining. The gas supplied from the gas supply source for refining to the first gas supply port 11 a is supplied to the blowing plug 2 a of the ladle 2 through the first pipe 11. Thereby, the molten steel M accommodated in the ladle 2 is stirred by a large amount of gas being discharged from the discharge port 2b of the blowing plug 2a, so that the molten steel M is refined.

  When the refining of the molten steel M is completed, the first gas supply port 11a of the gas supply device 1 is removed from the gas supply source for refining. Subsequently, the ladle 2 is moved and placed in a continuous casting apparatus for performing continuous casting, and the second gas supply port 13a of the gas supply apparatus 1 is connected to a gas supply source G for continuous casting. This connection operation may be performed automatically or manually.

  Next, gas supply from the gas supply source G to the second gas supply port 13a is started. The gas supplied to the second gas supply port 13a passes through the third pipe 13 and the second pipe 12, and is supplied to the blowing plug 2a via the pressure regulating valve 12b. Specifically, a slight amount of gas whose flow rate is controlled to be smaller than that of the first pipe 11 by the pressure adjusting valve 12b is supplied to the blowing plug 2a.

  Here, in the pressure accumulation cylinder 12c, gas from a gas supply source for refining (not shown) supplied to the first gas supply port 11a during refining is stored through the second pipe 12, and the second gas is used during continuous casting. The gas from the gas supply source G for continuous casting supplied to the supply port 13a is stored. Thereby, at the time of continuous casting, a small amount of gas can be continuously supplied to the blow plug 2a, and the molten steel M can be prevented from entering the blow plug 2a.

  In addition, since the 1st check valve 11b is arrange | positioned between the blowing plug 2a and the 1st gas supply port 11a in the 1st piping 11, from the blowing plug 2a to the 1st gas supply port 11a side at the time of continuous casting Prevents gas backflow. Further, since the second check valve 12a is disposed between the pressure regulating valve 12b and the first gas supply port 11a in the gas supply path of the second pipe 12, the first gas supply port from the second pipe 12 is provided. The backflow of gas to the 11a side is prevented. Furthermore, since the third check valve 13b is provided in the third pipe 13, gas is prevented from flowing backward from the second pipe 12 to the gas supply source G side.

  In the gas supply apparatus 1 of 1st Embodiment demonstrated above, it has the 1st gas supply port 11a to which gas is supplied at the time of refining of the molten steel M accommodated in the ladle 2, and the blowing attached to the ladle 2 The pressure which is the gas adjustment part for adjusting the 1st piping 11 which supplies gas to the plug 2a, the pressure accumulation cylinder 12c in which the gas from the 1st gas supply port 11a is stored, and the gas flow supplied to the blowing plug 2a A second pipe 12 that has a regulating valve 12b and supplies a smaller amount of gas to the blow plug 2a than the first pipe 11; and the molten steel M in the ladle 2 is continuously poured into the mold 4 through the tundish 3. And a third pipe 13 having a second gas supply port 13a through which gas is supplied at the time of casting and connected to the second pipe 12 on the gas upstream side of the pressure regulating valve 12b. .

  According to this gas supply device 1, when refining the molten steel M, the first gas supply port 11a is connected to the gas supply source for refining, and from the gas supply source for refining to the blow plug 2a through the first pipe 11. By supplying a large amount of gas and discharging a large amount of gas to the molten steel M from the discharge port 2b of the blowing plug 2a, the molten steel M can be refined.

  On the other hand, at the time of continuous casting, gas is supplied from the gas supply source G for continuous casting to the second gas supply port 13a of the third pipe 13, and is passed through the third pipe 13 and the second pipe 12 by the pressure regulating valve 12b. A slight amount of gas whose flow rate is controlled to be smaller than that of the first pipe 11 can be supplied to the blowing plug 2a. Thereby, during continuous casting, the gas whose flow rate is controlled by the pressure regulating valve 12b can be continuously supplied to the blowing plug 2a. Therefore, it is possible to prevent the molten steel M from entering the blowing plug 2a during continuous casting. Thereby, it can prevent that the molten steel M penetrate | invades in the blowing plug 2a at the time of continuous casting, and the blowing plug 2a is damaged.

  Moreover, since separate gas supply ports 11a and 13a are used for refining and continuous casting, the gas supply ports can be easily connected during continuous casting.

  Further, a first check valve 11b is provided between the blowing plug 2a and the first gas supply port 11a in the first pipe 11, and the pressure regulating valve 12b and the first gas supply port 11a in the second pipe 12 are provided. Since the second check valve 12a is provided, the gas can be prevented from flowing back to the first gas supply port 11a side during continuous casting. In addition, since the third check valve 13 is provided between the blowing plug 2a and the second gas supply port 13a in the third pipe 13, gas is transferred from the pressure accumulation cylinder 12c to the second gas supply port 13a side during continuous casting. Can be prevented from flowing backward. Thereby, the gas whose flow rate is controlled at the time of continuous casting can be reliably supplied to the blowing plug 2a.

[Second Embodiment]
Next, the gas supply apparatus in 2nd Embodiment is demonstrated with reference to FIG. In FIG. 5, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts will be described.

  In the gas supply device 1 of the second embodiment, a flow rate adjustment valve 12d is used instead of the pressure adjustment valve 12b of the first embodiment. The flow rate adjusting valve 12d is for adjusting the gas flow rate, and for example, a needle valve or the like is used.

  In the gas supply device 1 of the second embodiment, a small amount of gas whose flow rate is controlled to be smaller than that of the first pipe 11 by the flow rate adjusting valve 12d of the second pipe 12 during continuous casting is supplied to the blowing plug 2a. Is done.

  Also in the gas supply device 1 of the second embodiment, the same effects as those of the first embodiment described above can be obtained. That is, a large amount of gas can be supplied to the blowing plug 2a through the first pipe 11 during refining, and a small amount of gas whose flow rate is controlled by the flow rate adjusting valve 12d can be continuously supplied to the blowing plug 2a during continuous casting. Thereby, it is possible to prevent the molten steel M from entering the blow plug 2a during continuous casting.

[Third Embodiment]
Next, the gas supply apparatus of 3rd Embodiment is demonstrated with reference to FIG. In FIG. 6, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts will be described.

  In the gas supply device 1 of the third embodiment, the pipe diameter of the second pipe 12 is set smaller than the pipe diameter of the first pipe 11, and the second pipe 12 itself functions as the gas adjusting unit 12e. Has come to fulfill.

  In the gas supply device 1 of the third embodiment, a large amount of gas can be supplied to the blowing plug 2a via the first pipe 11 during refining, and through the second pipe 12 serving as the gas adjusting unit 12e during continuous casting. A slight amount of gas whose flow rate is controlled to be smaller than that of the first pipe 11 is supplied to the blowing plug 2a.

  Also in the gas supply device 1 of the third embodiment, the same effects as those of the first embodiment described above can be obtained. In particular, by making the pipe diameter of the second pipe 12 smaller than the pipe diameter of the first pipe 11, the amount of gas supplied to the blow plug 2a during continuous casting can be controlled to a small amount with a simple configuration.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and various modifications or expansions can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, a slit plug having a plurality of slits 2c is used as the blowing plug 2a. A porous plug configured as described above may be used.

  Further, after the end of continuous casting, when removing the residue in the ladle 2 and cleaning the blowing plug 2a, gas may be supplied from the gas supply source G or the pressure accumulation cylinder 12c to the blowing plug 2a. In this case, by injecting gas into the blowing plug 2a at the time of cleaning, the invading matter in the blowing plug 2a can be removed, and gas blowing at the next use of the blowing plug 2a can be ensured.

DESCRIPTION OF SYMBOLS 1 Gas supply apparatus 2 Ladle 2a Blow plug 3 Tundish 4 Mold 11 1st piping 11a 1st gas supply port 11b 1st check valve 12 2nd piping 12a 2nd check valve 12b Pressure adjustment valve (gas adjustment part)
12c Pressure accumulation cylinder 12d Flow rate adjustment valve (gas adjustment part)
12e Gas adjustment part 13 3rd piping 13a 2nd gas supply port 13b 3rd check valve M Molten steel G Gas supply source

Claims (5)

A first pipe for supplying gas to a blowing plug attached to the ladle, and having a first gas supply port to which gas is supplied during refining of the molten steel accommodated in the ladle;
A pressure accumulator for storing gas from the first gas supply port; and a gas adjusting unit for adjusting a flow rate of gas supplied to the blowing plug, and blowing a smaller amount of gas than the first pipe. A second pipe to be supplied to the plug;
The molten steel in the ladle has a second gas supply port to which gas is supplied during continuous casting in which the molten steel is poured into a mold via a tundish, and is connected to the second pipe on the gas upstream side of the gas adjusting unit. A third pipe to be connected;
A gas supply device comprising:   The gas supply device according to claim 1, wherein the gas adjusting unit is a throttle valve having a narrow gas supply path.   The gas supply device according to claim 1, wherein the gas adjustment unit is at least one of a pressure adjustment valve and a flow rate adjustment valve.   4. The gas supply device according to claim 1, wherein the gas adjusting unit is the second pipe having a pipe diameter smaller than that of the first pipe. 5. A first check valve provided between the blowing plug and the first gas supply port in the first pipe, for preventing the gas from flowing back to the first gas supply port side;
A second check valve provided between the blowing plug and the first gas supply port in the second pipe to prevent the gas from flowing back to the first gas supply port side;
A third check valve provided between the second pipe and the second gas supply port in the third pipe for preventing the gas from flowing back to the second gas supply port side;
The gas supply device according to any one of claims 1 to 4, further comprising:

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