KR100871936B1 - conservation method and apparatus of stave cooling system - Google Patents

Abstract

According to the present invention, the leak repair apparatus of the blast furnace stave supply and discharge pipe is a collet support shaft inserted into the discharge pipe or the supply pipe of the stave, the first collet member fixed to the end of the collet support shaft and tapered outer peripheral surface, the collet The second collet member is slidably installed on the support shaft and expands in diameter when engaged with the first collet member, and the second collet member is reduced in diameter when separated from the first collet member by an elastic member coupled to the outer circumferential surface. And an actuator for inserting the collet support shaft and supporting the second collet member when the collet support shaft is retracted in a state supported by the actuator.

Blast furnace, stave, leek.

Description

Leak repair method of stave supply pipe and discharge pipe of blast furnace and its apparatus {conservation method and apparatus of stave cooling system}

1 is a cross-sectional view showing a leak repair apparatus of the stave supply pipe and the discharge pipe of the blast furnace according to the present invention.

The present invention relates to a blast furnace of the stave cooling method, and more particularly to a leak repair method and apparatus for a water supply pipe or drain pipe connected to the stave.

In general, there is a method for cooling the furnace side wall portion of the blast furnace, there is a stave cooling method and a cooling panel cooling method for circulating water in the stave to cool the furnace side wall.

In the stave cooling method, stave bodies (typically made of spherical graphite cast iron) in which cooling pipes are embedded are installed inside the shell, so that a refractory brick is stacked on the stave body side so as to correspond to the inside of the blast furnace. In addition, the stave cooling method of another structure is a method in which the refractory bricks are supported step by step between the ribs of the stave body instead of stacking the refractory bricks.

The blast furnace to which the stave cooling method is applied has a structure in which a copper stave and a cast iron stave are equipped with excellent refractory and cooling ability on the inner surface of the steel bar as a main body. The copper stave is installed from the top of the blast furnace of the blast furnace with the strongest heat load to the middle of the softening fusion zone. And the cast iron stave is installed to the upper side of the blast furnace to the upper side of the copper stage by mounting the internal smoke and the cooling water pipe circulating supply is installed inside the blast furnace.

The blast furnace in which the stave cooling method is used can achieve long life of the blast furnace only when mechanical stability and structural stability due to the installation of the steel or copper stave are secured. In particular, the copper stave is designed to be thin because of its excellent cooling ability, structural stability is of paramount importance.

On the other hand, in the blast furnace employed by the stave cooling method, the refractory bricks arranged in particular on the inner side of the furnace of the stave have excellent abrasion resistance against wear caused by the flow of hot gas and wear caused by the drop of raw materials in the furnace. And good thermal insulation performance that can prevent the reduction of thermal efficiency caused by heat transfer from inside the furnace. The stave thus cools the furnace walls as well as the metal matrix and / or the refractory bricks on the inner side of the furnace to maintain its strength, with the coolant flowing through the cooling pipe, and the wear is increased by the increase of the heat load inside the furnace. Accelerating reduces the wear rate of the metal matrix and / or refractory bricks caused by the drop of raw material inside the furnace.

However, the structure of the stave cooling method in which the fire bricks are laminated on the furnace inner surface is structurally unstable because the stave body is supported only by the adhesive strength of the binder between the fire bricks. The stave cooling method of this structure has a problem that the refractory bricks fall off or break down as a result of the change in the spacing between ribs caused by thermal expansion / contraction during the operation of the blast furnace.

On the other hand, the blast furnace employing a stave cooling method has a problem that the refractory bricks fall off or break down as a result of the change in the spacing between the ribs caused by thermal expansion / contraction during operation. In particular, there is a problem in that the cooling water leaks because a crack is generated in the coupling portion of the cooling water pipe embedded in the stave and the cooling water supply pipe and the drain pipe for supplying and discharging the cooling water to the cooling water pipe. Such leakage of cooling water shortens the lifespan of the vulcanized member and the blast furnace because the cooling water flows into the blast furnace.

Since the stave cooling method is a structure of the cooling method for each part, it is difficult to replace the leaked coolant as described above. Therefore, there is a problem in that the work by the blast furnace must be stopped in order to repair the damaged part of the water supply pipe or the discharge pipe and the stave by the thermal deformation.

The present invention is to solve the problems described above, it is easy to repair according to the occurrence of cracks in the connection part of the water jacket and the supply pipe or discharge pipe of the stave can greatly reduce the work maneuver, the stave is mounted on the blast furnace It is an object of the present invention to provide a leak repairing method and apparatus for stave supply and discharge pipes in a blast furnace that can be repaired in a state.

Leak repair method of the stave supply and discharge pipe of the blast furnace of the present invention for achieving the above object,

A detecting step of detecting whether the cooling water supply pipe and the discharge pipe of the stave are leaked;

A diagnostic step of detecting the position of the cooling water supply pipe and the discharge pipe of the stave through an endoscope;

Slit fixed to the end of the collet support shaft and supporting the sleeve coated with sealing material on the second collet member whose diameter is expanded and contracted when the outer circumferential surface is joined and separated with the tapered first collet member. Eve installation steps,

Retracting the collet support shaft is characterized in that it comprises a repair step for repairing the leaking portion by engaging the second collet member and the first collet member to expand the sleeve.

Leak repair device of the blast furnace stave supply and discharge pipe to achieve the above object is to repair the leak portion of the supply pipe and discharge pipe coupled with the water jacket of the blast furnace stave to supply and discharge the cooling water,

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A collet support shaft inserted into the discharge pipe or the supply pipe of the stave,

A first collet member fixed to an end of the collet support shaft and having an outer circumferential surface thereof tapered thereto;

A second collet member slidably installed on the collet support shaft, the diameter of which expands when combined with the first collet member, and which decreases in diameter when separated from the first collet member by an elastic member coupled to the outer circumferential surface;

Actuator for advancing the collet support shaft forward and backward

The guide member is inserted into the collet support shaft and supports the second collet member when the collet support shaft is retracted in the state supported by the actuator.

In the present invention, the actuator comprises a rodless inlet cylinder.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the repair method of the stave supply pipe and the discharge pipe of the blast furnace according to the present invention.

The method for repairing the stave supply pipe and the discharge pipe leak of the blast furnace according to the present invention is to repair a crack at the junction of the water jacket and the supply pipe or the discharge pipe of the stave. A detection step of detecting whether or not the leak occurs, and a diagnostic step of detecting a position where the coolant is leaked by precisely inspecting the position of the leaked part by putting an endoscope into the supply pipe and the discharge pipe generated by the pressure test. . In the detecting step, the pressure test may block the outlet of the discharge pipe, inject constant water through the supply pipe, apply a set water pressure, and detect whether or not leakage occurs through the change of the pressure.

When the position of the leak is determined by the diagnosing step, the sleeve is slidably installed on the collet support shaft having the first collet member installed at the end thereof and is supported by the elastic member to seal the coating material on the two collet members whose diameter can be expanded and reduced. A sleeve installation step of supporting the sleeve so that the sleeve is positioned at the leak portion, and a repair step of repairing the leak portion by extending the sleeve by retracting the collet support shaft to engage the second collet member and the first collet member. It includes. When the sealing is completed by expanding the sleeve to the leak portion, the collet support shaft is retracted to discharge the collet support shaft and the second collet member from the supply pipe or the discharge pipe.

One embodiment of the apparatus for repairing the stave supply pipe and the discharge pipe of the blast furnace as described above is shown in FIG.

Referring to the drawings, the leak repair device 10 of the blast furnace stave supply pipe and discharge pipe is a supply pipe 22 or discharge pipe (connected to the water jacket 21 of the stave 20 installed on the back of the refractory material of the blast furnace 100 ( 23) For repairing the leakage of the coupling portion, the collet support shaft 31 is inserted into the discharge pipe or the supply pipe of the stave, and fixed to the end of the collet support shaft 31, the taper 32 is formed on the outer peripheral surface One collet member 33 is provided. The collet support shaft 31 is made of an elastic material that can be deformed according to the bending state of the supply pipe 22 or the discharge pipe 23. In addition, the first collet member 33 installed at the end of the collet support shaft 31 is formed in the shape of a truncated cone having a tapered outer circumferential surface to expand toward the end side.

In addition, the collet support shaft 31 is slidably provided with a guide member 50 supporting the second collet member 40 when the second collet member 40 and the collet support shaft 31 are retracted. The collet support shaft 31 includes an actuator 60 for supporting the guide member 50 and retracting the collet support shaft 31.

The second collet member 40 supports the sleeve 102 provided with the sealing material 101 on the outer circumferential surface to repair the leak portion and can be expanded at the leak portion. And a plurality of jaws 42 which are inserted into the tapered hollow portion 41 and the sleeve 102 corresponding to 33 and form a circular outer circumferential surface supporting the same. Grooves 44a and 45a are formed on the outer circumferential surface of the jaws 42 in the circumferential direction, and the grooves 44a and 45a are provided with the elastic members 44 and 45 to the first collet member 33. It is desirable to expand when combined with and separated. The elastic member may be made of an O-ring or a spring.

The guide member 50 supports the first collet member 33 when the collet support shaft 31 is retracted. A cylindrical body slidably coupled to the collet support shaft 31 and the body It is provided on the end side of the collet support shaft 31 is provided with a variable portion 51 to be synchronized with this deformation.

And the actuator 60 is preferably to use a hydraulic cylinder, but is not limited thereto.

Leak repair apparatus of the blast furnace stave supply pipe and the discharge pipe configured as described above is a supply pipe 22 or discharge pipe 23 in a state in which the sleeve 102 is coated with a sealing material on the outer peripheral surface of the second collet member (40) Insert it in so that the sleeve is positioned at the leak site.

In this state, the collet support shaft 31 is retracted using the actuator 60 so that the second collet member 40 and the first collet member 33 are coupled to each other so that the sleeve 102 is extended to the leak portion. The leak portion is sealed by a sealing material (fluorine rubber) provided on the outer circumferential surface of the sleeve 102.

When the sealing is completed by expanding the sleeve 102 to the leak portion, the collet support shaft 31 is retracted to open the collet support shaft 31 and the second collet member 40 from the supply pipe 22 or the discharge pipe 23. Discharge.

As described above, the maintenance method and apparatus for the stave supply pipe and the discharge pipe of the blast furnace according to the present invention can be repaired without separating the stave from the blast furnace, thereby reducing the production cost according to the repair.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (2)

A detecting step of detecting whether the cooling water supply pipe and the discharge pipe of the stave are leaked; A diagnostic step of detecting the position of the cooling water supply pipe and the discharge pipe of the stave through an endoscope; The sleeve is fixed at the end of the collet support shaft and the sleeve is coated with a sealing material coated on the second collet member whose diameter is expanded and contracted when the outer circumferential surface is joined to and separated from the tapered first collet member. A stage of installing the sleeve so that the sleeve is positioned in the And a repair step of repairing the leak portion by retracting the collet support shaft and engaging the second collet member and the first collet member to expand the sleeve. In the leak repair device of the blast blast supply and discharge pipe coupled with the water jacket of the blast furnace stave to repair the leak portion of the supply pipe and discharge pipe for supplying and discharging the cooling water, A collet support shaft inserted into the discharge pipe or the supply pipe of the stave, A first collet member fixed to an end of the collet support shaft and having an outer circumferential surface thereof tapered thereto; A second collet member slidably installed on the collet support shaft, the diameter of which expands when combined with the first collet member, and which decreases in diameter when separated from the first collet member by an elastic member coupled to the outer circumferential surface; Actuator for advancing the collet support shaft forward and backward And a guide member inserted into the collet support shaft and supporting a second collet member when the collet support shaft is retracted in a state supported by an actuator.

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