KR20200110119A - Lance Cooling Apparatus for Automatic temperature measurement in steel manufacturing process - Google Patents

Abstract

The present invention relates to a lance cooling apparatus with automatic steelmaking temperature measurement, which includes: an outer pipe (P1); and an inner pipe (P1) provided in the outer pipe to spray cooling gas injected from an upper inlet through a lower outlet. The lance cooling apparatus includes: a spiral member (300) combined with the outer circumference surface of the inner pipe to be located between the inner pipe and the outer pipe; a cylindrical connector member (400) screwed with upper and lower parts of the inner pipe; and a side cooling hole (425) formed on a side of the connector member to discharge the cooling gas in a vertical direction of the inner pipe. The spiral member (300) has a shape wrapping around the inner pipe spirally while being entirely formed on the inner pipe in a longitudinal direction and reinforces the strength of the outer pipe while coming in contact with the inner circumference surface of the outer pipe, keeps a gap between the inner pipe and the outer pipe, and leads the cooling gas discharged to a space between the inner pipe and the outer pipe to cool the outer pipe while touching the outer pipe evenly. The side cooling hole leads some of the cooling gas supplied from the inner pipe to be discharged to directly cool the outer pipe.

Description

Lance Cooling Apparatus for Automatic temperature measurement in steel manufacturing process}

The present invention relates to a lance cooling device for an automatic temperature measuring device, and more particularly, to a lance assembly having a cooling means capable of efficiently cooling the inside of the lance tube.

In the steelmaking process of a steel mill, a temperature measuring device is used to measure the temperature of molten steel in the ladle. 1 is a schematic diagram of an automatic temperature measuring device of a steel mill according to the prior art.

The automatic temperature measuring device 100 consists of a lance 102 and a probe 104 mounted at the tip of the lance 102, and lowers the lance 102 to immerse the probe 104 in the molten metal in the ladle 106. To measure the temperature automatically. Around the lance 102, there is a driving mechanism or support for moving and tilting the lance 102 up and down.

As shown in FIG. 1, since the ambient temperature of the ladle 106 containing high-temperature molten metal is always high, temperature measurement may not be accurately performed due to the influence of the high temperature around it. Conventionally, in order to prevent this and perform accurate temperature measurement, nitrogen was injected into the upper part of the lance 102 to cool the lance 102. 2 is a schematic diagram showing the internal structure of a conventional lance 102.

Referring to FIG. 2, the lance 102 has a probe holder 102-1 formed at its end to mount a probe. The lance 102 main body and the probe holder 102-1 have a holder connector 102-2. It is connected through. The lance 102 is a hollow body, and the internal compensation lead 102-4 and the external compensation lead 102-5 connected to the probe pass through the tip connector 102-3 in the holder connector 102-2.

As described above, when measuring the temperature, the temperature of the lance increases due to the influence of the temperature around the lance, which adversely affects the compensation wire inside the lance, resulting in inaccurate measurement. To prevent this, the gas inlet 102 at the upper end of the lance 102 -6) is formed to inject a gas such as nitrogen to cool the inside of the lance 102.

However, as shown in FIG. 2, the gas injected into the gas injection port 102-6 at the top of the lance descends toward the probe holder 102-1, but does not reach the holder connector 102-2. .

Therefore, there is a problem in that the cooling gas cannot be smoothly circulated in the lance 102 in this conventional manner, and thus sufficient heat in the lance 102 cannot be sufficiently cooled.

In addition, since the ambient temperature of the lance 102 is always high, when nitrogen with a low temperature inside the lance is injected, hot air is located above the lance 102 and the cold air is located below the cold air and the moisture 102 -7) is generated and the generated moisture affects the compensation conductors 102-4 and 102-5, so that the insulation of the compensation conductor in the lance 102 is destroyed, and the tar on the tip of the probe holder 102-1 Tar) was generated and the measured temperature value had a big difference from the actual temperature.

In addition, since the lance is in a hollow shape, there is a problem that deformation occurs in the structural shape of the lance because the lance is always in a high temperature state even though there are structurally weak parts.

Patent Document 1: Unexamined Patent Publication No. 10-2005-0059336

The present invention has been invented to solve the above problems, and an object of the present invention is to provide a lance assembly capable of accurately measuring the temperature of a molten metal by properly cooling the inside of the lance.

In addition, an object of the present invention is to provide a structural shape that maintains rigidity even in a high-temperature environment by improving the hollow lance structure and effectively cools the outer pipe.

The present invention, the outer pipe (P1); An inner pipe (P1) that is provided inside the outer pipe and sprays the cooling gas injected from the upper inlet through the lower injection port, and is coupled to the outer peripheral surface of the inner pipe, A spiral member 300 positioned between the inner pipe and the outer pipe; A cylindrical connector member 400 screwed to the upper and lower ends of the inner pipe; And a side cooling hole 425 formed on the side of the connector member to allow the cooling gas to be discharged in a vertical direction of the inner pipe, wherein the helical member 300 is formed on the inner pipe as a whole along the length direction. As it is formed, the inner pipe is wound in a spiral shape, and while in contact with the inner circumferential surface of the outer pipe, it reinforces the strength of the outer pipe, maintains a gap between the inner pipe and the outer pipe, and is discharged into the space between the inner pipe and the outer pipe. Steel making temperature, characterized in that gas is evenly in contact with the outer pipe to allow cooling of the outer pipe, and the side cooling hole allows a part of the cooling gas supplied from the inner pipe to be discharged to directly cool the outer pipe. Provides automatic measuring lance cooling system.

The present invention has the effect of cooling the cooling device so that the temperature of molten steel can be accurately measured by improving the structure of the lance assembly according to the above configuration, and stable temperature data is obtained.

According to the present invention, the cooling gas injected into the lance moves smoothly along the spiral flow path, so that the external pipe is evenly cooled, and effective direct cooling is performed through the side hole of the connector.

1 is a schematic diagram of an automatic temperature measuring device lance cooling device of a steel mill according to the prior art,
2 is a longitudinal cross-sectional view of a lance assembly of an automatic temperature measuring device according to the prior art,
3 is a longitudinal cross-sectional view of a lance assembly, which is a lance cooling device for automatically measuring steelmaking temperature according to an embodiment of the present invention.
4 is a view in which a spiral member and a connector member are provided in an inner pipe of a lance assembly according to another embodiment of the present invention,
5 is a cross-sectional view and a longitudinal cross-sectional view of the connect member according to the present invention,
6 is a view of a lance assembly, which is a lance cooling device for automatically measuring steelmaking temperature according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. In addition, the terms used are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user operator. Therefore, definitions of these terms should be made based on the contents of the present specification.

3 is a longitudinal sectional view of a lance assembly that is a lance cooling device for automatically measuring steel making temperature according to an embodiment of the present invention, and FIGS. 4 to 6 are a lance assembly that is a lance cooling device for automatically measuring steel making temperature according to another embodiment of the present invention. It is the appearance of the connector member in the inner pipe. 5 is a connect member according to the present invention, (a) is a longitudinal cross-sectional view of the connect member, (b) is a cross-sectional view.

To summarize the features of the present invention, it is a dual-structure lance assembly composed of an inner member and an outer member, and provides a technology for injecting cooling gas into the inner member and removing it into the space formed by the inner member and the outer member. After another hollow inner pipe is placed inside the pipe, cooling gas is supplied to the inner pipe, and the supplied cooling gas rises from the bottom to the top and is discharged to the outside.At this time, the cooling gas is discharged between the inner pipe and the outer pipe. Rise up

The present invention is characterized by having a spiral connecting member connecting the outer circumferential surface of the inner pipe and the inner circumferential surface of the outer pipe in order to facilitate the flow of the rising cooling gas and at the same time to reinforce the strength of the lance assembly. It is to increase the cooling efficiency of the external pipe by extracting a part of the cooling gas that moves down the ride and injecting it directly into the external pipe.

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

3 is a cross-sectional view of a lance cooling device (or, also referred to as a lance assembly, 200) for automatically measuring a steel making temperature according to the present invention. The lance assembly 200 of the present invention is formed by installing an outer pipe P1 located outside and an inner pipe P2 inside the outer pipe. Both the outer pipe and the inner pipe are hollow pipes. The external pipe 200 is connected to the probe holder 230 through the hold connector 220, and a gas discharge device 290 for discharging the introduced cooling gas is formed on the upper portion of the external pipe 200.

An inlet port P2-1 through which cooling gas is introduced from the outside is formed in the upper part of the inner pipe P2, and an injection port P2-2 through which the introduced cooling gas is injected is formed in the lower part of the inner pipe. The lower end of the lower pipe of the lance assembly is installed to be spaced apart from the hold connector 220 by a predetermined distance. The internal compensating conductor 250 of the lance assembly of the present invention is connected to the external compensating conductor 26 through a tip connector 240, and the external compensating conductor 260 is disposed in the internal pipe P2.

When the cooling gas is injected into the inlet (P2-1) of the inner pipe (P2), the cold cooling gas (C) descends and descends to the injection port (P2-2) of the inner pipe and is injected, and the injected cooling gas is then injected into the lance assembly. The hot gas H existing between the inner pipe and the outer pipe is pushed upward and discharged to the gas discharging device 290 of the outer pipe P1. In addition, a part of the cooling gas continues to descend in the direction of the probe holder to continue the cooling action. Since the upper end of the outer pipe is sealed, the hot gas H pushed upward in the space between the inner pipe and the outer pipe is discharged to the gas withdrawal device 290. Accordingly, the cooling gas can be smoothly circulated even to the bottom of the lance assembly to cool the inside of the lance assembly. In addition, since the external compensating conductor is arranged and formed in the inner pipe, the cooling gas can effectively cool the external compensating conductor, thereby preventing the measured temperature value from changing or rising, and the insulation of the compensating conductor is destroyed. It can also prevent it from becoming. In addition, the lance assembly of the present invention may further include a speed controller formed to be fixedly coupled with a screw to the gas outlet of the external pipe, so that the amount of the discharged gas can be adjusted.

4 is a state in which a spiral member and a connector member are provided in an inner pipe of a lance assembly according to another embodiment of the present invention, and FIG. 5 is a cross-sectional view and a longitudinal cross-sectional view of the connect member according to the present invention, and FIG. 6 is This is a view of a lance assembly, which is a lance cooling device for automatically measuring steelmaking temperature according to another embodiment.

The lance assembly 200 of this embodiment further includes a helical member 300 that is helically disposed between the outer pipe P1 and the inner pipe P2. The spiral member is formed as a whole along the longitudinal direction of the inner pipe P2, and is manufactured by being inserted into the outer pipe while being attached to the outer peripheral surface of the inner pipe by spot welding. The spiral member 300 is disposed between the inner pipe and the outer pipe to maintain a constant gap therebetween and at the same time serve to increase the rigidity of the outer pipe. In addition, the spiral member serves to make the flow of the cooling gas flowing through the space between the inner pipe and the outer pipe uniform. The spiral member of the present invention has the following features.

The connecting member 300 is a phenomenon in which the inner pipe is wound in a spiral shape while extending the entire length of the inner pipe, so that the cooling effect of the cooling gas is made evenly throughout the outer pipe to increase cooling efficiency, and the overall screw reinforcement Therefore, it is possible to prevent thermal deformation of the lance at high temperatures emitted from the ladle.

[Equal cooling of external pipes through uniform flow of flow]

In the case of the lance assembly according to the prior art, there is no guarantee that the cooling gas flowing through the space between the inner pipe and the outer pipe maintains a uniform flow as a whole. In other words, the inner pipe is not located in the center of the outer pipe, or for other reasons, the space between the inner pipe and the outer pipe (hereinafter, the spaced space) may not maintain the same distance up and down, and sprayed to the bottom of the inner pipe. There was no guarantee that the cooled gas was also discharged to the outside by moving upward while flowing from the spaced space to the Golgo.

In contrast, in the present invention, due to the spiral member 300 formed through the entire length of the inner pipe, the spaced space between the outer pipe P1 and the inner pipe P2 is uniformly formed, and the cooling gas flowing through this space By maintaining a uniform flow in the inner space, the overall contact area between the outer pipe and the cooling gas is increased, and as a result, uniform cooling of the entire outer pipe is guaranteed.

That is, in the prior art, when the cooling gas is discharged while flowing in only one direction of the spaced space, there is a problem that the external pipe is cooled only where the cooling gas moves, but in the present invention, cooling while flowing evenly throughout the spaced space. Since the gas is discharged to the outside, the effect of cooling the external pipe is generated evenly.

[Lance Assembly Strength Reinforcement]

In the case of a conventional lance assembly, an inner pipe is disposed in an outer pipe and a space maintaining member is disposed therebetween. However, there is a problem that the conventional gap maintaining member is weak in strength. That is, there is a problem that structural deformation of the external pipe occurs in a very high temperature environment of 1000 degrees in the actual molten steel site.

In the present invention, since the spiral member is arranged entirely in the space between the inner pipe and the outer pipe, there is an effect of preventing structural deformation of the outer pipe.

[Effect of the absence of a connector]

The present invention further includes a connector member 400 that is screwed at the upper and lower ends of the inner pipe to increase the cooling effect of the outer pipe.

The connector member 400 has a cylindrical shape with an open top and bottom, and a side cooling hole 425 is formed at four locations on its side 420, so that a part of the cooling gas through the side cooling hole 425 is horizontally Let it spray. In the drawing, reference numeral 430 denotes a cooling gas injected from the side cooling hole. That is, the cooling gas flows down the inside of the inner pipe and passes through the connector member coupled to the bottom of the inner pipe. At this time, a part of the cooling gas is injected through the side cooling hole 425 of the connector member. Is to cool down directly.

That is, in the conventional case, the cooling gas injected from the bottom of the inner pipe descends in the direction of the probe holder to perform a cooling action, and then the cooling gas injected from the bottom of the inner pipe is hot gas (H) existing between the inner pipe and the outer pipe. It is a structure that is pushed up to the top of the external pipe and is expelled from the outside. However, in the present invention, a part of the cooling gas is directly injected into the external pipe through the side cooling hole of the connector member (not rising after the cooling gas is injected downward) to cool the external pipe, thereby improving the efficiency of cooling. It was raised. At this time, the amount injected to the side can be controlled by adjusting the number and diameter of the appropriate side cooling holes, and in the present invention, four holes are provided and the diameter is set to be 5 mm. In addition, a part of the cooling gas continues to descend in the direction of the probe holder to continue the cooling action.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

Claims (3)

Outer pipe (P1); An internal pipe (P1) provided inside the external pipe and spraying the cooling gas injected from the upper inlet through the lower injection port;
A spiral member 300 coupled to the outer circumferential surface of the inner pipe and positioned between the inner pipe and the outer pipe;
A cylindrical connector member 400 screwed to the upper and lower ends of the inner pipe; And
Includes; a side cooling hole 425 formed on the side of the connector member to discharge the cooling gas in a vertical direction of the inner pipe,
The spiral member 300 is formed entirely in the inner pipe along the longitudinal direction and winds the inner pipe in a spiral shape, and in contact with the inner circumferential surface of the outer pipe to reinforce the strength of the outer pipe, and between the inner pipe and the outer pipe Maintain a gap, and allow cooling gas discharged to the space between the inner pipe and the outer pipe to evenly contact the outer pipe to cool the outer pipe,
The side cooling hole, characterized in that a part of the cooling gas supplied from the inner pipe is discharged to directly cool the outer pipe, characterized in that the steel-making temperature automatic measurement lance cooling device. The method of claim 1,
The spiral member is manufactured by being spot welded to the inner pipe and then inserted into the outer pipe,
The connector member is a steel-making temperature automatic measurement lance cooling device, characterized in that coupled to the inner pipe using a screw formed on the inner peripheral surface. The method of claim 1,
The lance cooling apparatus for automatically measuring the steel making temperature, characterized in that four side cooling holes are formed perpendicular to the side of the connector member.

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