KR100916065B1 - A submerged pipe for rh systen - Google Patents

Abstract

When the vacuum chamber is pressed down, the molten steel is raised and lowered in the vacuum chamber according to the degree of vacuum, thereby providing a deposition tube that blocks the slag suction at the start of the vacuum degassing facility (RH) made of high clean steel.

The immersion pipe in which the slag suction is blocked at the start of the vacuum may include an iron shell below the connection part connected to the lower side of the vacuum chamber, and a fireproof member provided inside and outside the iron shell; And a partition wall means having a refractory brick which is connected to the steel bar connection part and corresponding to the thickness of the slag of the upper molten steel and provided to block the suction of the vacuum chamber of the slag at the start of the vacuum.

According to the present invention, when the vacuum is started in the vacuum chamber, only the molten steel is raised through the inner deposition pipe of the partition wall means corresponding to the thickness of the slag of the molten steel upper layer, thereby effectively blocking the suction of the slag vacuum chamber, thereby While improving the quality, a more improved effect of preventing equipment accidents due to slag suction can be obtained.

Vacuum Degassing Equipment (RH), Vacuum Tank, Sedimentation Pipe, Rise Pipe, Descent Pipe, Slag Bulkhead Means

Description

A SUBMERGED PIPE FOR RH SYSTEN}

1 is a schematic view showing a vacuum chamber and a deposition tube for a general vacuum degassing

2 is a structural diagram showing the structure of the immersion pipe

Figure 3 is a schematic diagram showing a vacuum tank suction problem of the slag generated in the conventional immersion pipe

Figure 4 is a schematic perspective view showing a immersion tube is blocked slag suction when starting the vacuum in accordance with the present invention

FIG. 5 is an exploded view showing a deposition tube in which slag suction is blocked at the start of the vacuum of the present invention; FIG.

Figure 6 is a structural diagram showing a immersion tube is blocked slag suction when the present invention starts vacuum

Figure 7 is a plan view showing a immersion tube is blocked slag suction when the inventors start the vacuum

8 (a) to (d) is an operating state diagram showing the operation step of the immersion tube is blocked slag suction when starting the vacuum of the present invention

Figure 9 is a schematic diagram showing the operating state of the fire resistant bulkhead in the present inventors pipe                 

Explanation of symbols on the main parts of the drawings

1 .... Sedimentation pipe 10 ....

12 .... Steel connection 20 .... Fireproof member

22 .... Firebrick 24 .... Castable

26 .. Rail plate 30 .... bulkhead means

32 .... corrugated pipe 34 .... deep

36 .... Fireproof bulkhead 38 .... Rail groove

40 .... oxygen washing pipe 42 .... nozzle

The present invention relates to a deposition tube of a vacuum degassing facility (RH) that is made of high-clean steel as molten steel is raised and lowered into the vacuum chamber according to the degree of vacuum when the vacuum chamber is pressed down, and more specifically, the molten steel outside the deposition tube. By providing the slag bulkhead means having an intermediate specific gravity of and slag, when the deposition pipe is deposited in the molten steel and the vacuum is started in the vacuum chamber, only the molten steel is raised through the inner deposition pipe of the partition means corresponding to the thickness of the slag in the upper layer of the molten steel. The present invention relates to a sedimentation tube which effectively blocks slag suction of the slag, thereby improving the quality of molten steel and preventing slag suction at the start of vacuum to prevent equipment accidents caused by slag suction.                         

One of the facilities for manufacturing high clean steel in steel mills is the vacuum degassing equipment (Reinstahl Huten Werke Heraus, RH). When the vacuum degassing equipment is forced into the vacuum tank, the molten steel rises into the vacuum tank according to the degree of vacuum. In order to ensure the quality required by the demand in the vacuum degassing operation, it is necessary to manage the vacuum state in the vacuum chamber to the highest vacuum close to the absolute vacuum while descending.

However, the purpose of the vacuum degassing treatment is to separate and remove impurity gases such as oxygen, nitrogen, and hydrogen contained in the molten steel by using high vacuum. In such vacuum degassing treatment, a vessel having high vacuum is formed. It is divided into a vacuum chamber and its lower part into a rising tube and a lowering tube, and is deposited on an actual molten steel, and is a vacuum forming line for forming an internal vacuum of the vacuum chamber connected to the vacuum tube side to enable the rising and lowering action of the molten steel. It consists of ejector, steam spray nozzle, condenser and water tank.

On the other hand, Figure 1 and Figure 2 shows the vacuum chamber, the lower and the lower pipe of the vacuum chamber 100, the deposition pipe 110 of the up and down pipes are connected, such a vacuum tank 100 On the lower side is a ladle 130, which is charged with the molten steel 120 is raised and lowered.

And, in detail look at the cylindrical tube immersion tube 110, as shown in Figure 2, the cylindrical steel bar to the lower side of the flange portion 112 connected in a flange form to the connection portion of the vacuum chamber 100 The 114 is disposed, and the fire bricks 116 constituting the inner diameter portion D having a great friction with the molten steel when the molten steel is raised and lowered in the inner part of the steel bar 114 are constructed. On the outside is a castable 118 of the amorphous refractory deposited on the molten steel.

By the way, the length of the immersion pipe 110 is about 1000mm, the inner diameter of the inner diameter portion D through which the molten steel passes is about 400mm, the immersion pipe 110 used as a rising pipe, although not shown in the drawings of molten steel Argon gas, which is an inert gas, is added to facilitate the synergy.

On the other hand, the immersion pipe 110 is deposited to a certain depth, for example, about 700mm in the molten steel, when the vacuum is started (formed) inside the vacuum chamber 110, because the molten steel 120 is sucked into the vacuum chamber, The deposition depth of the deposition pipe is reduced to 400 mm, and the operator again adjusts the depth of the deposition pipe 110 to 700 mm deeper, which means that the slag 122 of the upper layer of the molten steel 120 is reduced in the vacuum chamber 100 when the deposition depth is lowered. This is because the degassing efficiency is reduced while being sucked into the slag, and thus the slag 122 sucked into the vacuum chamber 100 may cause a large-scale equipment accident while being sucked up to the ejector which is a vacuum forming line. to be.

However, as shown in FIG. 3, the slag 122 of the upper layer of the molten steel 120 of the ladle 130 has a thickness T of about 70 to 120 mm, and the slag flow rate during the ladle tapping of the molten steel through the converter. When the slag thickness is increased, the thickness of the slag may be increased by 400-700 mm, and in this case, since it is difficult for an operator to accurately grasp the slag thickness T of the molten steel layer on the ladle, the deposition depth of the deposition pipe 110 is typically used. If it is about 700mm, as shown in Figure 3, the depth of the actual deposition tube 110 is deposited in the molten steel is small, and eventually the molten steel is sucked into the vacuum chamber during the vacuum start of the vacuum vessel 100, the deposition tube 110 As the depth of the molten steel is further reduced, the slag 122 is easily sucked into the vacuum chamber 110 through the deposition pipe 110.

That is, as described above, the degassing efficiency of the molten steel is reduced by the slag sucked into the vacuum tank 110, the quality of the molten steel is lowered, in particular, the equipment accident due to the slag sucked into the equipment of the vacuum chamber or ejector Will be.

On the other hand, Japanese Laid-Open Patent Publication No. Hei 5-140633 discloses a technique for preventing the suction of the vacuum tank of the slag, which is the site where the deposition pipe is deposited by injecting gas into the site where the deposition pipe is deposited on the molten steel through the ladle. The molten steel is ejected to the water level and the slag is pushed out to prevent the suction of the slag through the immersion pipe.

However, in the method of blowing gas as described above, the blowing conditions of the gas must be maintained precisely, and the inhalation prevention efficiency of the actual slag is not high.

In addition, Japanese Laid-Open Patent Publication No. 2202-38213 discloses a technique for preventing inhalation of the slag vacuum chamber, which is a separate vessel in the early stage of depositing the deposition tube in molten steel rather than the vacuum initiation of the vacuum chamber during degassing. And to separate the molten steel directly below the immersion pipe to prevent the suction of slag.

However, the technique through the separation of slag and molten steel using such a container is related to the deposition of molten steel in the molten steel, it is impossible to block the slag immediately around the deposition pipe, and after the vessel is deposited in molten steel, As it should be, the efficiency of blocking the suction of the vacuum chamber of the slag at the time of starting the vacuum is almost no, and it is also difficult to variably cope with the formation thickness of the slag (T in Fig. 3).

The present invention has been made in order to improve the various problems as described above, the object of the present invention is to provide a slag partition wall means having a specific gravity between the molten steel and the slag to the outside of the deposition pipe, the deposition pipe is deposited on the molten steel and the vacuum tank When the vacuum is started within the molten steel layer, only molten steel is raised through the inner deposition pipe of the partition wall corresponding to the thickness of the slag of the molten steel layer, thereby effectively blocking the suction of the vacuum tank of the slag, thereby improving the quality of the molten steel. An object of the present invention is to provide a deposition tube in which slag suction is blocked at the time of vacuum initiation to prevent equipment accidents caused by slag suction.

As a technical configuration for achieving the above object, the present invention, the bottom of the connecting portion connected to the lower side of the vacuum chamber;
Fireproof members provided on the inside and the outside of the iron shell; And,
A partition wall means having a firebrick associated with the steel connecting portion and provided to block the suction of the vacuum chamber of the slag at the time of starting the vacuum while corresponding to the thickness of the slag of the upper layer of the molten steel;
By providing a sedimentation pipe to block the suction of slag at the start of the vacuum configured to include.

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

Figure 4 is an immersion tube is blocked slag suction when starting vacuum in accordance with the present invention, Figure 5 is an exploded view showing the immersion tube is blocked slag suction when starting vacuum, Figure 6 is a immersion is blocked slag suction when starting vacuum 7 is a plan view illustrating a deposition tube in which the slag suction is blocked when the vacuum is started, and FIGS. 8A to 8D illustrate an operation step of the deposition tube in which the slag suction is blocked when the vacuum is started. Figure 9 is an operating state diagram showing, Figure 9 is a schematic diagram showing the operating state of the fire resistant bulkhead in the present invention.

Figure 4 shows the overall configuration of the immersion tube (1) is blocked the suction of the slag at the start of the vacuum of the present invention, such a immersion tube (1) of the present invention largely the shell 10 and the fire-resistant member 20 and the partition wall It is divided into a means 30, these components 10, 20, 30 look in detail as follows.

First, as shown in FIG. 4 and FIG. 6, the steel bar 10 is lower than the connecting part 12 (flange part) connected to the connecting part 12 ′ (flange part) to the lower side of the vacuum chamber 100. It is formed integrally with a cylindrical shape.

And, as shown in Figure 4 and 6, the refractory member 30 is provided on the inside, the outer side of the steel shell 10, specifically, the refractory brick 22 is in direct contact with the molten steel is raised and lowered It is integrally constructed on the inner surface of the steel shell 10, and the castable 22, which is an amorphous refractory deposited on molten steel, is integrally formed on the outer surface of the steel shell 10, and the outside of the castable 22. On both sides, rail plates 26 are formed integrally to support the vertical flow of the fire resistant partition 36 of the partition wall stage 30, which will be described later. Is formed.

Next, FIGS. 3 to 6 illustrate the partition means 30 of the deposition pipe 1 in which the slag suction is blocked when the vacuum initiation of the present invention is blocked, and the partition means 30 of the present invention includes the steel connecting portion ( 12) is configured to block the suction of the vacuum chamber of the slag at the time of starting the vacuum while corresponding to the thickness (T) of the slag 122 of the molten steel 120 upper layer.

At this time, the partition wall means 30 of the present invention can be divided into a corrugated pipe part 32 and the core part 34 and the fire-resistant partition wall 36 which substantially blocks the suction of the vacuum tank 100 of the slag. Looking at it as follows.

First, as shown in FIGS. 5 to 7, the corrugated pipe part 32 of the partition means 30 is connected to the connecting portion 12 and formed in a bellows shape capable of contraction and expansion in the vertical direction. Of course, the upper portion of the corrugated pipe portion 32 is fixed to the side of the connecting portion 12, the corrugated pipe portion 32 is formed as a double pipe for cooling water circulation therein is connected to the cooling water pipe (32a) It is installed so as not to be damaged even at high temperature.

Next, the core portion 34 is formed in a cylindrical shape which is integrally extended to the lower end of the corrugated pipe portion 32, and the fire resistant partition 36 which is integrally castable on the inner and outer sides of the core portion 34 is integrally formed. Is provided.

At this time, the fireproof partition 36 of the partition means 30 passes through the slag to form a stable deposition depth in the molten steel, the middle weight of the slag 122 in the ladle 110 and the upper slag 122 of the molten steel, that is, of the molten steel Since the specific gravity is 8.0 and the slag specific gravity is 4.0, it is formed as 6.0, which will be described in detail below, so that the fire resistant partition 36 corresponds to the slag 122 thickness T of the upper layer of the ladle molten steel 120. Regardless of the thickness of the slag 122 is always passed through the slag to be deposited to a certain depth in the molten steel, to block the suction of the vacuum tank 100 of the slag.

5 to 7, the rail plate 26 provided on the immersion pipe castable 24 to stably maintain the vertical flow of the fire resistant partition 36 on the inner circumferential surface of the fire resistant partition 36. That is, the rail groove 38 into which the rail plate portion of the rectangular shape is inserted and supported is integrally formed.

In addition, as shown in FIG. 7, a space A is formed between the castable 24 outside the steel shell and the fireproof partition 36 spaced apart from each other, and the thickness A has a thickness S of about 5 mm. ) To minimize the flow of molten steel into the space.

In this case, a plurality of nozzle holes 42 of the oxygen washing pipe 40 fixed to the iron shell 10 are disposed in a plurality of annular shapes in the upper portion of the space A between the fireproof partition 36 and the steel shell castable 24. It consists of the configuration.

Referring to the operation of the present invention made of the above configuration as follows.

As shown in FIGS. 4 to 9, when the vacuum is started in the vacuum chamber, only the molten steel is raised through the inner deposition tube of the partition means 30 corresponding to the thickness of the slag of the molten steel upper layer, so that the suction of the vacuum tank of the slag is performed. While effectively blocking, thereby improving the quality of the molten steel, the sedimentation pipe (1) that blocks the slag suction when starting the vacuum of the present invention to prevent equipment accidents due to the slag suction is as follows.

In general, during the degassing treatment, the deposition tube 1 is deposited in the molten steel at about 700 mm, and a vacuum is formed in the vacuum chamber 100. If the worker slag 122 thickness T of the upper layer of the molten steel flows out a large amount of slag It is 500mm, but it is 80-120mm as usual, and when the immersion pipe (1) is deposited, the actual depth of deposition is only 200mm.

Therefore, when the start of the vacuum forming the inside of the vacuum chamber 100 to the vacuum flows into the vacuum chamber 100, the level of the molten steel is reduced by about 300mm, and eventually the immersion tube 1 is in the slag layer The slag, which is in a deposited state and has a low specific gravity due to high vacuum, is introduced to the ejector of the equipment as well as the vacuum tank 100, thereby lowering the equipment accident as well as degassing efficiency.

Thus, as shown in Figures 8 and 9, the deposition pipe 1, the slag suction is blocked when starting the vacuum of the present invention, when the thickness T of the slag 122 of the molten steel layer is increased, the partition wall corresponding thereto The means 30 are deposited more deeply, effectively preventing suction of the vacuum chamber 100 of the slag 122 at the start of the vacuum.

That is, as shown in FIG. 8A, the fireproof partition 36 of the partition means 30 of the deposition pipe 1 is not deposited in the molten steel while the ladle 110 is raised, as shown in FIG. 8B. When the ladle 110 is completely raised and the immersion pipe 1 is gradually deposited on the molten steel 120, the fireproof partition 36 is formed at a specific gravity of about 6.0, which is halfway between the molten steel and the slag. It is deposited in correspondence to the thickness of the, and the lower end of the fireproof partition 36 is always more deeply deposited toward the molten steel at the boundary between the slag and molten steel, the flow of such a fire-resistant partition 36 is the upper portion of the steel connection 12 It is fixed to and made possible by the bellows-type corrugated pipe part 32.

Therefore, as shown in FIG. 8C, when the vacuum of the vacuum chamber 100 starts, only the molten steel 120 therein rises and falls while the slag is blocked by the fire resistant partition 36. As shown, when the ladle 110 is lowered, the deposition pipe 1 including the partition wall means 30 is separated from the molten steel.

Meanwhile, as illustrated in FIGS. 5 to 7, the cooling pipe 32a is connected to the corrugated pipe part 32, circulating the cooling water so that the corrugated pipe part 32 is damaged, and the fireproof partition 36 In the space A between the shell castable 24 and the nozzle hole 42 of the oxygen washing pipe 40 fixed to the outer portion as a fixing pin 44 on the shell 10 at the upper portion thereof is disposed and operated. After washing the molten steel introduced between the space (A).

In addition, the steel castable 24 is formed with a rail plate 26, that is, a rail plate having a rectangular shape, and the rail plate 26 is a rail groove formed in the fireproof partition wall 36 of the partition means 30. When the refractory bulkhead 36 flows up and down in accordance with the thickness of the slag, the upper and lower flows are stably maintained when the refractory bulkhead 36 flows up and down, and the rail plate 26 is considered in consideration of the flow of the refractory bulkhead 36. R) rather than the length of the groove 38 is formed longer.

Meanwhile, in the immersion pipe 1 of the present invention, the corrugated pipe part 32 of the partition means 30 is manufactured in bellows shape using stainless steel having heat resistance, but the vertical flow width of the corrugated pipe part 32 is about 300 mm. Considering that, since the molten steel is reduced to the level of the vacuum start 300mm, it should be recognized that there is no blocking effect of the slag in the state that the thickness T of the slag 122 is 600mm or more, the thickness of the slag (T In consideration of) is 70-120mm, there will be no problem in using the immersion pipe 1 of the present invention.

Accordingly, according to the immersion pipe (1) in which the slag suction is blocked at the start of the vacuum in accordance with the present invention, the lower end of the refractory bulkhead 36 of the partition wall means 30 in accordance with the slag thickness of the molten steel upper layer always molten steel 120 deeper than the slag ), The slag is effectively prevented from entering the vacuum chamber 10 and the ejector part of the facility through the deposition pipe even when the thickness is increased due to the large outflow of slag.

As described above, according to the sedimentation pipe in which the slag suction is cut off during the vacuum start of the present invention, the barrier means blocks the slag at the outside of the sedimentation pipe during the degassing operation in response to the slag thickness of the upper molten steel during the deposition of the molten steel. It provides the advantage of effectively preventing the suction of the vacuum chamber of the slag.

Therefore, the suction of the vacuum tank of the slag is prevented, the degassing efficiency is increased and the quality of the molten steel is improved.

Finally, it is to provide an excellent effect of reducing the maintenance and maintenance costs of the facility by preventing the equipment accident caused by the slag is sucked into the vacuum tank and the equipment line during the vacuum degassing operation.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. It is important to know that those who have knowledge of E can easily know.

Claims (5)

Iron shell 10 below the connection portion 12 connected to the lower side of the vacuum chamber (100); Wow, A fireproof member 20 provided inside and outside of the iron shell 10; And, Bulkhead means having a refractory brick (36) which is connected to the steel bar connection portion 12 and corresponding to the thickness (T) of the slag 122 of the molten steel (120) provided to block the suction of the vacuum tank of the slag at the start of the vacuum 30; The deposition pipe is configured to block the suction of the slag at the start of the vacuum. According to claim 1, wherein the refractory member 20 is made of a refractory brick 22 of the inner shell 10 and the castable 24 of the outside, The castable 24 is a deposition pipe, characterized in that the rail plate 26 is provided. The fireproof partition wall 36 of the partition wall means 30 is integrally extended to a lower portion of the corrugated pipe part 32 that is connected to the steel bar connection part 12 and is capable of contracting and expanding in the vertical direction. Integrally formed on the inside and outside of the 34 Immersion pipe characterized in that The fire resistant partition 36 of the said partition wall means 30 is comprised by the castable which is an amorphous refractory body integrally formed in the core part 34, The fireproof bulkhead 36 casted is formed with a middle gravity of the slag 122 of the molten steel 120 in the ladle 110 and the upper layer of the molten steel so as to pass through the slag to form a stable deposition depth in the molten steel. An immersion tube, characterized in that configured to correspond to [4] The rail groove of claim 3, wherein the rail plate 26 provided in the immersion pipe castable 24 is inserted and supported on the inner circumferential surface of the fire resistant partition 36 to stably maintain the up and down flow of the fire resistant partition 36. 38) is formed integrally, The corrugated pipe part 32 is connected to a coolant pipe 32a for cooling water circulation, and the corrugated pipe part 32 is formed of a double tube of heat resistant stainless steel for bellows operation. A plurality of nozzle holes 42 of the oxygen washing pipe 40 fixed to the steel bar 10 are directly above the space A between the fireproof partition wall 36 and the steel shell castable 24 of the partition wall means 30. Submerged tube that is blocked inlet slag at the start of the vacuum, characterized in that the opening ring

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