KR101636925B1 - Apparatus and method for repairing damaged stave - Google Patents

Apparatus and method for repairing damaged stave Download PDF

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Publication number
KR101636925B1
KR101636925B1 KR1020150120639A KR20150120639A KR101636925B1 KR 101636925 B1 KR101636925 B1 KR 101636925B1 KR 1020150120639 A KR1020150120639 A KR 1020150120639A KR 20150120639 A KR20150120639 A KR 20150120639A KR 101636925 B1 KR101636925 B1 KR 101636925B1
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KR
South Korea
Prior art keywords
press
stave
air
connection part
piping port
Prior art date
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KR1020150120639A
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Korean (ko)
Inventor
김준호
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주식회사 포스코
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Priority to KR1020150120639A priority Critical patent/KR101636925B1/en
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Publication of KR101636925B1 publication Critical patent/KR101636925B1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/10—Cooling; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/04—Blast furnaces with special refractories
    • C21B7/06—Linings for furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Blast Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

The present invention relates to an apparatus and a method to repair a damaged stave, allowing a repair without stopping a normal operation when the stave in a furnace is damaged. The apparatus to repair the damaged stave in order to repair a damage on a coolant pipe connecting a first pipe port and a second pipe port in a stave, comprises: a first connection part to selectively supply steam, air, and injection materials through the first pipe port or to close the first pipe port; and a second connection part to supply the air through the second pipe port or to close the second pipe port. The first connection part supplies steam while the second pipe port is closed by the second connection part, followed by air supplied by the second connection part and the injection materials supplied by the first connection part.

Description

[0001] Apparatus and method for repairing damaged stave [0002]

The present invention relates to a stave breakage repairing apparatus and method, and more particularly, to a stave breakage repairing apparatus and method capable of repairing breakage of a corona furnace stave during normal operation.

Generally, the blast furnace is a facility for continuously producing charcoal for 24 hours, charging iron ore and coke alternately to the upper part, blowing hot air of about 1100 ~ 1200 ° C to the lower part, .

The hot air entering the tuyere reacts with the fuel coke to produce a high temperature of 2,200 ° C to 2,400 ° C and melts the iron ore, which is the raw material, by using this high heat to produce charcoal.

A stove having a cooling water pipe circulating and supplying cooling water is installed on the inner surface of the furnace iron furnace of the furnace in order to protect the furnace iron from the high temperature generated in the furnace.

In order to prevent this, it is necessary to repair the stave before the breakdown time has elapsed. In order to prevent this, it is necessary to repair the stave before the breakdown time has elapsed.

However, during the normal operation of the blast furnace, the pressure in the furnace takes about 4 Kg / cm 2 , and various foreign substances are contained in the furnace gas stream. In order to pressurize the pressurized material into the cooling water pipe, the pressure in the furnace must be 0 to 1 kg / cm 2 , and the inside of the cooling water pipe must be clean without any foreign substance.

As a result, it is inevitable to repair the blast furnace after a long period of hibernation. In addition, if the breakage is not repaired in a timely manner, there is a possibility that cracks will be generated in the surrounding wicking due to the broken stave, and it becomes very difficult to achieve the aging management and normal operation. It is necessary to repair the stave in a timely manner during normal operation.

Korean Patent Registration No. 10-1167131 (Published on July 20, 2012) Japanese Patent Laid-Open Publication No. 2005-008908 (published on January 13, 2005) Korean Patent Publication No. 10-2014-0032698 (published on March 17, 2014)

An object of the present invention is to provide a stave breakage repair apparatus and method capable of repairing a stave during normal operation when a corona body stave breakage occurs.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

A stave breakage repairing apparatus according to a preferred embodiment of the present invention is a stave breakage repairing apparatus for repairing breakage of a cooling water pipe connecting a first pipe port and a second pipe port in a stave, A first connection part for selectively supplying steam, air, and press-fitting material through the first connection part or closing the first piping part; And a second connection part for selectively supplying steam, air, and press-fit material through the second piping port or closing the second piping port, wherein the second connection part is provided with the second piping port, The first connection part supplies steam, the second connection part supplies air, and the first connection part supplies the press-fitting material.

The first connection portion and the second connection portion simultaneously supply air at a first pneumatic pressure after the first connection portion supplies steam with the second connection portion closing the second piping port, It is preferable that air is supplied at a second pneumatic pressure lower than the first pneumatic pressure, and the first connection portion supplies the press-fitting material.

The first pneumatic pressure is preferably 12 to 13 kg / cm 2 , and the second pneumatic pressure is preferably a normal operating pressure.

It is preferable that the stave breakage repairing apparatus further comprises a press-fitting member blocking portion for preventing back flow of the press-fitting member in at least one of the first connecting portion and the first piping hole and between the second connecting portion and the second piping hole Do.

It is preferable that the press-fitting member blocking portion includes a plurality of protrusions therein or a protrusion extending spirally along an inner circumferential surface of a cylindrical pipe-like shape.

A method for repairing a stave breakage according to a preferred embodiment of the present invention is a stave breakage repairing method for repairing breakage of a cooling water pipe connecting a first pipeline port and a second pipeline port in a stave, Closing the second piping port or the first piping port and supplying the steam through the first piping port or the second piping port; And (b) applying air pressure through the second piping port or the first piping port, and press-fitting the press-fitting member into the first piping port or the second piping port.

Wherein the step (a) closes the second piping port and supplies the steam through the first piping port, and the step (b) The method further comprises the step of press-fitting the press-fit material into the first pipe port and simultaneously applying the first pneumatic pressure between the step (a) and the step (b) through the first pipe port and the second pipe port And the air pressure in the step (b) is preferably a second air pressure lower than the first air pressure.

The first pneumatic pressure is preferably 12 to 13 kg / cm 2 , and the second pneumatic pressure is preferably a normal operating pressure.

The stave breakage repairing apparatus and method of the present invention have the following effects.

(1) The apparatus and method for repairing and repairing a stave breakage of the present invention can repair the stave breakage even during normal operation.

(2) The apparatus and method for repairing stave breakage according to the present invention prevent backflow of the press-fitting member during insertion or insertion of the press-fitting member for stab repair.

(3) The stave breakage repair apparatus and method of the present invention reduce the heat load of the furnace stave.

(4) The apparatus and method for repairing stave breakage according to the present invention prevent cracking of the furnace body iron.

(5) The stave breakage repairing method and method of the present invention prevents additional breakage of the furnace stave.

(6) The apparatus and method for repairing and repairing stave breakage of the present invention prevent generation of heat in the piping valve of the furnace stove.

(7) The apparatus and method for repairing stave breakage of the present invention facilitate blast furnace burning management.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a steam breakage repairing apparatus according to a preferred embodiment of the present invention for supplying steam to a stave pipe; FIG.
2 is a view showing that a stave breakage repairing apparatus according to a preferred embodiment of the present invention applies a high pressure air pressure to a stave pipe.
3 is a view showing that the stave breakage repairing device according to the preferred embodiment of the present invention applies normal operating pressure to the stave pipe and presses the press-fitting member.
4 is a view illustrating a state in which a stave breakage repairing apparatus according to a preferred embodiment of the present invention completes maintenance of a stave.
5 is a flowchart of a stave breakage repair method according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a view showing that a stave breakage repairing apparatus according to a preferred embodiment of the present invention supplies steam to a stave pipe, FIG. 2 is a schematic view of a stave breakage repairing apparatus according to a preferred embodiment of the present invention, 3 is a view showing that the stave breakage repairing device according to the preferred embodiment of the present invention applies normal operating pressure to the stave pipe and presses the press-fitting member .

The stave breakage repairing apparatus 100 according to the preferred embodiment of the present invention is for repairing breakage of the stave 10.

The stove 10 is installed inside the screed 1 to protect the screed 1 from the high heat generated in the blast furnace and the cooling water pipe 10 through which the cooling water is supplied and circulated is installed in the stree 2 do. The cooling water pipe 10 includes a cooling water supply pipe and a cooling water discharge pipe which are connected to the outside of the blast furnace through the blast furnace pipe 1. The cooling water supplied to the cooling water supply pipe is discharged to the cooling water discharge pipe via the cooling water pipe 10. In the present specification, the cooling water supply pipe and the cooling water discharge pipe are referred to as a first pipe port 11 and a second pipe port 12, respectively. When the first piping port 11 functions as a cooling water supply pipe, the second piping port 12 functions as a cooling water discharge pipe. When the first piping port 11 functions as a cooling water discharge pipe , And the second pipe port 12 will function as a cooling water supply pipe. In the preferred embodiment of the present invention, although the first pipe fitting 11 is located at the upper portion of the stave 2 and the second pipe fitting 12 is shown at the lower portion of the stave 2, The piping port 11 may be located below the stave 2 and the second pipeline 12 may be located above the stave 2. [

The stave breakage repairing apparatus 100 according to the preferred embodiment of the present invention is designed so that the stove breakage repairing apparatus 100 is operated in a normal operation of blast furnace (generally, the air flow rate is 5800 Nm 3 / min and the wind pressure is 4 kg / cm < 2 >), and includes a first connection portion 110 and a second connection portion 120. [

The first connection part 110 is a member connected to the first pipe port 11 and selectively supplies steam, air and press-fitting material through the first pipe port 11 or selectively closes the first pipe port 11 .

The second connection part 120 is a member connected to the second pipe port 11 and functions to supply air through the second pipe port 11 or to close the second pipe port 11. [

The first connection part 110 preferably has two supply paths. That is, the steam / air pipe 112 to which steam and air are supplied and the pressurized re-pipe 114 to which the press-fitting material is supplied may be connected to the first connection portion 110. A steam / air valve 113 is provided between the steam / air pipe 112 and the first connection part 110 to regulate an inflow amount of steam and air, and between the pressurization re-pipe 114 and the first connection part 110 A press-in re-valve (115) is provided to regulate the inflow amount of the press-in member. It is also preferable that the steam and the air are respectively supplied to separate supply paths.

The first connection part 110 includes a press member blocking part 130 connected to the first pipe guide 11 and preventing back flow of the press-in member, which will be described later.

The second connection portion 120 is connected to the air piping 122 through which the air is supplied. An air valve 123 is provided between the air pipe 122 and the second connection part 120 to adjust the inflow amount of the air.

The stave breakage repairing apparatus 100 according to the present invention repairs the stave breakage through the following steps.

1, the second connection part 120 closes the air valve 123 to cut off the air supply to the second pipe port 12, and in this state, the first connection part 110 ) Gradually opens the steam / air valve 113 to supply the steam supplied through the steam / air line 112 through the first pipe line 11. The steam is preferably supplied at a temperature of about 130 DEG C at a pressure of 6 to 7 kg / cm < 2 >.

The steam supplied at a high temperature and pressure causes dirty foreign matter and by-products in the cooling water pipe 10 to be discharged into the furnace through the cracked portion 15 of the cooling water pipe 10. The steam is preferably supplied for about 10 minutes, and when the washing and the clogging of foreign matters / byproducts are completed, the steam / air valve 113 is closed to terminate the steam supply.

2, when the first connection part 110 stops supplying steam, the first connection part 110 and the second connection part 120 supply air at the same first pneumatic pressure.

The steam / air valve 113 of the first connection part 110 and the air valve 123 of the second connection part 120 are opened at the same time and the first air pressure is applied to the inside of the cooling water pipe 10, And finally discharges foreign matter still remaining in the cooling water pipe 10 to the inside of the furnace. The foreign matter is discharged into the furnace through the cracked portion 15 of the cooling water pipe 10 and the cracked portion 15 is further spread like a trumpet toward the inside of the furnace by the high pressure first pneumatic pressure . The first pneumatic pressure is preferably 12 to 13 Kg / cm 2 . If the first pneumatic pressure is less than 12 Kg / cm 2 , the foreign matter of the cooling water pipe 10 is not effectively discharged, and if the first pneumatic pressure is more than 13 Kg / cm 2 , excessive load can be applied to the equipment. If the foreign substance is sufficiently removed by the first step, it is also possible to carry out the third step without performing the second step.

3, the first connection part 110 stops supply of the first pneumatic air to the cooling water pipe 10 and the second connection part 120 stops supplying the air to the cooling water pipe 10, The first connection part 110 supplies the pressurized material to the cooling water pipe 10.

The steam / air valve 113 of the first connection part 110 which has applied the first air pressure is closed by 100% and the air valve 123 of the second connection part 120 which has applied the first air pressure is opened by only 30% So as to apply the second pneumatic pressure. The second pneumatic pressure is preferably 4 kg / cm 2 , which is the normal operating pressure.

The press fitting valve 115 of the first connecting portion 110 is opened and the castable is introduced into the first pipe fitting 11 through the press fitting re-pipe 114. It is preferable that the press-fitting member is connected to an external press-fitting device (not shown) by connecting the press-fitting re-pipe 114. Further, the press-in pressure of the press-fitting member is preferably 15 kg / cm 2 .

The second pneumatic pressure by the second connection portion 120 is set to a normal operating pressure of 4 kg / cm 2 and the press-in pressure of the press-fitting member is set to 15 kg / cm 2 to flow into the narrow cooling water pipe of 50 A or 40 A The press-fitting member closes the inside of the cooling water pipe tightly. If the second pneumatic pressure is larger than the normal operating pressure, the press-fitting member is not smoothly press-fitted, and if the second pneumatic pressure is lower than the normal operating pressure, the press-fit member is not smoothly discharged into the furnace through the cracked portion 15 .

The step of supplying the second air pressure to the cooling water pipe 10 by the second connection part 120 and the step of supplying the pressurizing material to the cooling water pipe 10 by the first connection part 110 may be performed simultaneously, May be carried out with a time lag more than the other one.

It is preferable that the stave breakage repairing apparatus according to the preferred embodiment of the present invention further includes a press member blocking member 130. The press member blocking member 130 may be positioned between the first pipe fitting 11 and the first connecting member 110 or between the second pipe fitting 12 and the second connecting member 120, .

The press member blocking member 130 prevents the press member from flowing back during press fitting of the press member. The press member blocking member 110 is preferably a cylindrical tube member, and one or more protrusions 132 are formed on the inner circumferential surface thereof to prevent backflow of the press member. The protrusion 132 may be formed by arranging a plurality of annular members along the longitudinal direction of the press member blocking member 130 and the helical protrusion 132 may extend along the inner circumferential surface of the press member blocking member 130.

When the first valve 13 and the second valve 14 are closed after the press-fitting member is press-fitted to repair the breakage of the stave 2, the closed first valve 13 and / The second valve 14 is broken due to the heat generated by the second valve 14 so that the press-in material can flow backward. However, when the press-fitting member 130 is connected to the first valve 13 and / or the second valve 14, the press-fitting member and the protrusion 132 filled in the press- The backflow of the press-fitting member can be prevented.

4 is a view illustrating a state in which a stave breakage repairing apparatus according to a preferred embodiment of the present invention completes maintenance of a stave. The first connection portion 110 and the second connection portion 120 are removed and the first valve 13 and the second valve 14 are closed to prevent the press-fit material from flowing back. As described above, the backflow of the press-in member can be completely blocked by the press-in member blocking member 130.

5 is a flowchart of a stave breakage repair method according to a preferred embodiment of the present invention.

The method of repairing stave breakage according to the preferred embodiment of the present invention includes a step S100 of closing the second piping 12 and supplying steam through the first piping 11, (S200) simultaneously applying the first air pressure through the first piping port (12) and the second piping port (12), closing the first piping port (11), applying the second air pressure through the second piping port 1 includes a step (S300) for pressing in the press-fitting member to the piping port 11 and re first pneumatic is 12 to 13 kg / cm 2 are preferred, and the second air pressure is preferably of 4 kg / cm 2 normal operating pressure Do. Here, without step S200, steps S100 and S300 may follow.

While the present invention has been described in connection with certain exemplary embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the scope of the present invention.

1: evil 2: stave
10: cooling water piping 11: first piping port
12: second piping port 13: first valve
14: second valve 15: cracked portion
100: stave breakage repairing device 110: first connection part
112: steam / air piping 113: steam / air valve
114: press-fit re-pipe 115: press-fit valve
120: second connection part 122: air piping
123: air valve 130: press-
132: protrusion

Claims (11)

A stave breakage repairing apparatus for repairing breakage of a cooling water pipe connecting a first pipe line and a second pipe line in a stave,
A first connection part for selectively supplying steam, air, and press-fit material through the first piping port or closing the first piping port; And
And a second connection part for selectively supplying steam, air, and press-fitting material through the second piping port or closing the second piping port,
After the second connection portion closes the second piping port and the first connection portion supplies steam,
Wherein the first connection portion and the second connection portion simultaneously supply air at a first air pressure,
Wherein the second connection part supplies air at a second air pressure lower than the first air pressure, and the first connection part supplies the press-fitting material.
delete The method according to claim 1,
And the first pneumatic pressure is 12 to 13 kg / cm < 2 >.
The method according to claim 1,
And the second pneumatic pressure is a normal operating pressure.
The apparatus according to claim 1, wherein the stave breakage repairing apparatus
Further comprising a press-fitting member blocking portion for preventing back-flow of the press-fitting member in at least one of the first connecting portion and the first piping hole, and between the second connecting portion and the second piping hole. .
6. The method of claim 5,
Wherein the press-fitting member blocking portion includes a plurality of protrusions inside.
6. The method of claim 5,
Wherein the press-fitting member blocking portion includes a cylindrical tube-shaped protrusion extending spirally along an inner circumferential surface thereof.
A stave breakage repair method for repairing a breakage of a cooling water pipe connecting a first pipe line and a second pipe line in a stave,
Closing the second piping port and supplying steam through the first piping port;
Simultaneously applying a first pneumatic pressure through the first piping port and the second piping port; And
Applying a second pneumatic pressure lower than the first pneumatic pressure through the second piping port, and pressing the press-fitting member into the first piping port.
delete 9. The method of claim 8,
Wherein the first pneumatic pressure is 12 to 13 kg / cm < 2 >.
9. The method of claim 8,
And the second pneumatic pressure is a normal operating pressure.
KR1020150120639A 2015-08-27 2015-08-27 Apparatus and method for repairing damaged stave KR101636925B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61107090A (en) * 1984-10-29 1986-05-24 住友金属工業株式会社 Method of repairing cooling pipe for furnace body
JP2005008908A (en) 2003-06-16 2005-01-13 Kobe Steel Ltd Method for repairing outer steel shell in blast furnace
KR101167131B1 (en) 2009-06-26 2012-07-20 현대제철 주식회사 Blast furnace with cooling plate
KR20140032698A (en) 2012-09-07 2014-03-17 주식회사 포스코 Method for repairing the damaged stave of blast furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61107090A (en) * 1984-10-29 1986-05-24 住友金属工業株式会社 Method of repairing cooling pipe for furnace body
JP2005008908A (en) 2003-06-16 2005-01-13 Kobe Steel Ltd Method for repairing outer steel shell in blast furnace
KR101167131B1 (en) 2009-06-26 2012-07-20 현대제철 주식회사 Blast furnace with cooling plate
KR20140032698A (en) 2012-09-07 2014-03-17 주식회사 포스코 Method for repairing the damaged stave of blast furnace

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