KR101614604B1 - Method for opening tuyere of blast furnace - Google Patents

Abstract

The present invention relates to an apparatus for opening a tuyere of a furnace capable of opening a refractory using a tuyere membrane closing a tuyere through a voltage application rather than a physical impact, and a tuyere closing and opening method using the same. The apparatus comprising: a metal rod installed through the refractory to remove the refractory closing the tuyere of the furnace; A cable electrically connected to the metal rod; And voltage applying means for applying voltage to the metal rod through the cable to melt the metal rod.

Description

[0001] METHOD FOR OPENING TUYERE OF BLAST FURNACE [0002]

The present invention relates to an apparatus for opening a tuyere of a furnace and a method of opening the tuyere using the tuyere. More particularly, the present invention relates to an apparatus for opening a tuyere of a furnace capable of opening a refractory using a tuyere membrane, And a method of opening a tuyere using the same.

Ancillary work in ironworks is the operation of producing molten iron using iron ore (sintered oresite, etc.) and coke, and is usually carried out in a blast furnace (blast furnace).

The furnace is a facility for producing iron ore by melting and melting iron ore, and uses coke as fuel. The iron ore and coke that are charged to the upper part of the blast furnace are melted as hot iron through the reduction reaction that crosses with the hot air blown from the tuyere and discharged to the outside of the blast furnace through the outlet.

A tuyere is a facility for blowing hot air (hereinafter referred to as hot air) generated in a facility by hot air into a furnace, and is composed of a copper-made body portion and an internal cooling water pipe receiving and draining line.

FIG. 1A is a view showing a hot air supply structure employed in a general furnace. The hot air blowing hot air to the blast furnace 10 is connected to the air blowing port 12 of the blast furnace 10 via a blow pipe 13, The large air vents 12 are inserted and fixed in the screed of the blast furnace 10, and the hot air is positioned near the high temperature and nearest to the high temperature in the blast furnace at about 2000 ° C, Blowing hot air into the blast furnace. At this time, the tuyere (11) integrally formed in front of the large air vortex (12) serves as a passage of hot air.

Thus, when hot air is blown through the tuyere 11, the iron ore charged in the blast furnace 10 is melted and reduced to produce molten iron.

On the other hand, at the time of re-blowing after a long period of hung-out due to blast furnace water damage and large-scale facility accident, central flow is secured by increasing the flow rate of the tug and the flow of the slag to the tug (11) The front ends of the plurality of tuyere (11) except for a small number of tuyere (11) located at the upper part of the tuyere are tightly sealed and sealed with the tuyere film refractory.

Thereafter, the tuyere 11 is sequentially passed through the closed tuyere 11 considering the degree of heat transfer in the furnace. At this time, the tuyere 11 is opened by various methods.

FIG. 1B is a view showing that a tornado is opened with a refractory material, and FIG. 1B shows a method of penetrating a tornado film refractory using a steel bar, which is the most common method of opening tornado.

The iron bar 21 is inserted through an observation port provided in the blow pipe 13 in order to remove the refractory 20 used for closing the tongue film 11 closing the tip of the tongue 11, And the refractory 20 is passed through the refractory 20 by bending the refractory 20 while reciprocating from side to side. The above operation is repeatedly performed for the passage of the aesthetic passage of the refractory 20, and the other tuyere 11 is pierced when the refractory 20 is passed therethrough.

However, the conventional work method described above requires a large number of workers, and it takes 20 to 30 minutes to perform 20 to 30 penetration operations. In addition, in order to perform the penetration work, there is a problem in that instability of the normal operation and unstability of the aging process are caused by subjecting to a plurality of motions during the amplification work, resulting in instability of the operation and productivity. Also, the barbed - type penetrating device had many limitations in the working environment. Due to the work environment surrounding the different tuyeres with blast furnaces, the use of steel bars with a length of 4 ~ 5m was often inconceivable, making it difficult to smoothly penetrate the work. In addition, safety barriers such as gas poisoning and burn due to in-furnace CO gas emission existed in the process of penetrating refractories by inserting iron bars.

Thus, recently, various methods for penetrating the refractory using the tungsten film and opening the tungsten have been proposed and applied. For example, techniques have been proposed in which high-pressure water is injected into a refractory to penetrate the refractory, or the metal sphere is pressurized to high pressure to penetrate the refractory.

An apparatus and a method for spraying high-pressure water through a refractory to penetrate the refractory are specifically known in, for example, "a sealed refractory crushing apparatus using an observation hole of a blast pipe," (Patent Document 1) The technique of piercing a refractory by pressurizing a metal sphere with high pressure is specifically known in "a tuyere opening device of a furnace (patent document 10-2010-0074548) ".

However, the technique using high-pressure water as in Patent Document 1 has a disadvantage that high-pressure water used for penetration flows into the interior of the blast furnace and adversely affects the internal heat of the blast furnace. In my ancestral waters, inundation in the furnace may cause large accidents such as cold water as well as a drop in the temperature of the charcoal.

In addition, as in Patent Document 2, the technique using a metal sphere has a disadvantage in that not only the penetration of the refractory but also the torn and the blow pipe are damaged because the metal sphere is pressure-fed by the high pressure.

[Patent Document 1] Japanese Patent Application Laid-Open No. 10-2004-0051144 (Jun. 18, 2004) [Patent Document 1] Japanese Patent Application Laid-open No. 10-2010-0074548 (Feb.

The present invention provides a tuyere apparatus for a furnace capable of penetrating a refractory using a tuyere membrane that is closing a tuyere without a physical impact from the outside, and a tuyere opening method using the same.

According to an embodiment of the present invention, there is provided an apparatus for removing refractory for closing a tuyere of a furnace, comprising: a metal rod installed through the refractory; And voltage applying means provided in electrical connection with the metal rod to melt the metal rod.

And a metal connector provided so as to be able to apply a voltage to the metal bar, wherein a cable is connected between the metal bar and the voltage applying means or between the metal connector and the voltage applying means.

It is preferable that the metal connection body is provided while surrounding an end of the metal rod or embedded in the end of the metal rod, and the material forming the metal connection body is higher in melting point than the material forming the metal rod .

The metal rod may be formed of copper (Cu), and the metal connection body may be formed of tungsten (W).

The cable comprising: a wire electrically connected to the metal rod or the metal connection body; And a heat-resistant covering member covering the outer circumferential surface of the electric wire so as to protect the electric wire when the metal rod melts.

According to another aspect of the present invention, there is provided a method of opening a tuyere of a furnace, the method comprising the steps of: filling a tundish-type refractory material into a tip end side of the tuyere, closing a tuyere through a refractory material; Forming a flow path through which hot air flows in the refractory by melting the metal rod, and removing the refractory while blowing hot air through the flow path to open a tuyere.

The step of closing the tongue may include the steps of filling the inner surface of the tongue with a refractory material using the tongue film in a kneading state; Inserting a metal rod through the refractory; And drying the refractory.

In the process of inserting the metal rod, it is preferable that the metal rod is inserted through the refractory to the coke layer which is seated in front of the tuyere.

The step of opening the tuyere includes: applying a high voltage to the metal rod; A process in which a metal bar to which a high voltage is applied is melted by its inherent resistance to form a flow path as much as a space in which a metal rod is inserted; And blowing hot air through the flow path to remove the refractory.

In the process of forming the flow path, the flow path is formed up to the coke layer seated in front of the tuyere. In the process of removing the refractory, the flow of hot air, Is preferably removed.

According to the embodiment of the present invention, when a voltage is applied, a metal rod that is melted by its inherent resistance is used to apply a physical impact to the refractory material, which is easily closed without using high-pressure water, There is an effect that a flow path can be formed.

Accordingly, it is possible to prevent damage to the tuyere caused by the physical impact and excessive opening of the seating coke layer, and the operator does not need to work around the tuyere, Can be prevented from being intoxicated.

In addition, it is possible to prevent the temperature of molten iron in the hearth from being lowered due to the high-pressure water-free use, and to minimize fluctuation of the sulfur content.

Further, it is possible to simplify the penetration work of the tuyere, thereby reducing the number of workers and reducing the workload of the worker.

FIG. 1A is a view showing a hot air supply structure employed in a general furnace,
FIG. 1B is a view showing that a tornado film is conventionally opened with a refractory closed tuyere,
2 is a perspective view showing a tuyere apparatus of a furnace according to an embodiment of the present invention,
3 is a cross-sectional view showing a tuyere apparatus of a furnace according to an embodiment of the present invention,
3B is a cross-sectional view illustrating a tuyere apparatus of a furnace according to another embodiment of the present invention,
4 is a view showing a state in which a tuyere apparatus of a furnace is mounted on a tuyere according to an embodiment of the present invention,
5A to 5E are views showing a method of closing and opening a tuyere using a tuyere apparatus of a furnace according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

FIG. 2 is a perspective view showing a tuyere apparatus of a furnace according to an embodiment of the present invention, and FIG. 3 is a sectional view showing a tuyere apparatus of a furnace according to an embodiment of the present invention.

As shown in the drawings, a tuyere assembly according to an embodiment of the present invention includes an airfoil film-use refractory 20 that closes a tuyere 11 of a blast furnace (hereinafter, referred to as "blast furnace 10" And includes a metal rod 110, a cable 130, a metal connector 120, and a voltage applying means 140. [

The metal rod 110 is made of a cylindrical rod having a predetermined length and diameter by using a metal material as a means for melting when a voltage is applied due to its inherent resistance. At this time, the length of the metal rod 110 is formed to be longer than the thickness of the filament film using refractory 20 that closes the filament 11 during operation, and the diameter is formed to be smaller than the minimum diameter of the filament 11. Of course, the metal rod 110 may be formed in various shapes having a length enough to penetrate the pyramid film refractory 20 without being limited to a bar having a cylindrical shape.

The metal rod 110 is formed using copper (Cu) having a relatively low melting point among the metal materials so that the metal rod 110 can be easily melted by the inherent resistivity when voltage is applied.

The metal connection body 120 is a means for protecting the cable 130 when the metal rod 110 is melted while electrically connecting the metal rod 110 and the cable 130. The metal connection body 120 may be made of metal, As shown in Fig. For example, the metal connection body 120 is formed in a pipe shape having an inner diameter equal to the diameter of the metal rod 110, and the end of the metal rod 110 is inserted into the metal connection body 120 and fixed thereto.

At this time, the metallic connection body 120 is made of tungsten (W) having the highest melting point among metal materials in order to maintain connection with the cable 130 while the metallic rod 110 is melted by the application of voltage .

Of course, the metal rod 110 and the metal connection body 120 are not limited to being made of copper and tungsten as in the illustrated embodiment, and the melting point of the material forming the metal connection body 120 is Various materials having conductivity higher than the melting point of the material forming the metal rod 110 may be used.

The cable 130 is a means for transferring the voltage applied from the voltage application means 140 to the metal rod 110, and various voltage application cables may be used.

For example, the cable 130 may be a wire 132 connected to the metal connector 120. However, in order to prevent the electric wire 132 from being damaged by the high temperature generated during the melting of the metal rod 110 by the application of the voltage and the high temperature inside the tuyere 11, the outer circumferential surface of the electric wire 132 has heat resistance Is coated with the heat-resistant covering material (131). In this embodiment, the cable 130 is connected to the metal connector 120, but when the metal connector 120 is not provided, the cable 130 is directly connected to the metal bar 110 It will be possible.

The voltage applying unit 140 applies a high voltage to the metal rod 110 via the cable 130 to melt the metal rod 110.

Meanwhile, the metal connection body is not limited to the illustrated embodiment, and connection with the metal rod can be implemented in various ways.

For example, as shown in FIG. 3B, a tuyere apparatus 200 of a furnace according to another embodiment of the present invention includes a metal rod 210, a metal connector 220, a cable 230, Voltage applying means (not shown) is provided.

However, the metal connector 220 is electrically connected to the metal bar 210 in such a manner that the metal connector 220 is embedded at the end of the metal bar 210. The metal connector 220 is formed into a rod having a diameter smaller than the diameter of the metal rod 210 and press-fitted into the end of the metal rod 210 to be closely fixed thereto as it is planted.

A method of closing and opening the tuyere of the blast furnace using the tuyere apparatus constructed as described above will be described.

First, a method for installing a tuyere apparatus according to an embodiment of the present invention on a tuyere will be described.

4 is a view showing a state in which a tuyere apparatus of a furnace is mounted on a tuyere according to an embodiment of the present invention.

As shown in FIG. 4, the metal rod 110 penetrates the refractory 20 using the tongue film closing the tuyeres 11 so that both ends thereof protrude from the refractory 20. Preferably, the tip of the metal rod 110 protrudes forward through the refractory 20 so that it can contact the coke layer (C in FIG. 5A) that is seated inside the blast furnace 10. The rear end of the metal rod 110 is exposed to the outside of the refractory 20 so that the metal connection body 120 connected to the rear end of the metal rod 110 does not contact the refractory 20.

The cable 130 is connected to the metal connection body 120 by a pair so as to connect the (+) and (-) poles of the voltage applying means 140.

The cable 130 is connected to the voltage application means 140 through the inside of the blow pipe 13 at the metal connector 120 and extends to the outside through the observation port 14 provided at the rear end of the blow pipe 13 do.

Next, a method of closing and opening the tuyere will be described.

5A to 5E are views showing a method of closing and opening a tuyere using a tuyere apparatus of a furnace according to an embodiment of the present invention.

When the tuyere 11 is to be closed, first, the refractory 20 using the tuyere film is prepared in a kneaded state, and then the refractory 20 prepared as shown in Fig. 5A is filled at the tip of the tuyere 11. 5A, the refractory 20 using the filament film is shown as one type of refractory, but the present invention is not limited thereto. Various types of refractory materials such as octo, pollen, and stamp material may be filled alone or in combination with a plurality of layers .

Before the refractory 20 is dried, the metal rod 110 is inserted through the refractory 20 such that the tip of the metal rod 110, to which the metal connector 120 and the cable 130 are connected, passes through the refractory 20 as shown in FIG. 5B. At this time, the metal rod 110 penetrates the refractory 20 and inserts up to the coke layer C which is seated in front of the tuff 11. Then, the cable 130 is maintained to be extended to the outside through the observation port 14 of the blow pipe 13.

The refractory 20 is dried while the metal rod 110 is inserted into the refractory 20 to close the tip of the tuyere 11. [

When the tuyere 11 is to be opened, the cable 130 connected to the metal rod 110 connects the voltage applying means 140, and the metal bar 110 has a sufficient voltage to melt by its inherent resistance .

Then, as shown in FIG. 5C, the flow path S is formed by the space in which the metal rod 110 is inserted while the metal rod 110 is melted. When the metal rod 110 is completely melted, the metal connector 120 and the cable 130 are taken out from the inside of the blow pipe 13.

5D and 5E, when the hot air is blown by using the blow pipe 13, the flow path S1 is expanded while the refractory 20 around the flow path S is removed from the wind pressure of the hot air blown by the blow pipe 13, The remaining refractory 20 is removed by the reaction heat generated by the reaction of the hot air with the coke layer C and the tuyere 11 is completely opened. Then, the flow path S2 is extended to the coke layer C, and the flow path S2 through which the hot air finally flows is secured.

Although the refractory material 20 around the flow path S is firstly removed and the coke oven layer C is subsequently melted by the blowing of the hot air in the drawing, the present invention is not limited to this, (C) may be melted first and the refractory 20 may be removed later.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

10: Blast Furnace 11: Tuff
12: Large wind 13: Blow pipe
14: Observation sphere 20: Refractory
21: steel bar 100, 200: tuyere opening device
110, 210: metal bar 120, 220: metal connector
130, 230: Cable 131: Heat-resistant covering material
132: electric wire 140: voltage applying means
C: Coke layer S, S1, S2:

Claims (10)

delete delete delete delete delete As a method for opening a tuyere of a furnace,
Filling a refractory using an airfoil film inside the tip end side of the tuyere and closing a tuyere by inserting a metal rod through the refractory material;
Forming a flow path through which hot air flows in the refractory by melting the metal rod, and removing the refractory while blowing hot air through the flow path to open a tuyere.
7. The method of claim 6, wherein closing the tongue
Filling the refractory material using the filament film in a kneading state inside the tip side of the tuyere;
Inserting a metal rod through the refractory;
And drying the refractory.
The method of claim 7,
Wherein the metal rod is inserted through the refractory into the coke layer seated in front of the tuyere in the process of inserting the metal rod.
The method of claim 6, wherein opening the tuyere
Applying a high voltage to the metal rod;
A process in which a metal bar to which a high voltage is applied is melted by its inherent resistance to form a flow path as much as a space in which a metal rod is inserted;
And blowing hot air through the flow path to remove the refractory.
The method of claim 9,
In the process of forming the flow path, the flow path is formed up to the coke layer seated in front of the tuyere,
Wherein the refractory is removed by removing the refractory by the wind pressure of the hot air blowing and the reaction heat generated by the reaction of the coke layer and the hot wind.

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