JPS63100112A - Method for fitting stave in repairing furnace wall brick of blast furnace - Google Patents

Abstract

PURPOSE:To remarkably reduce number of stages for fitting stave and further to reduce number of blast stoppings and blast stopping time by reforming stave body, so as to take the stave in the furnace by using a tube seat for exchanging existing armor plate. CONSTITUTION:The stave body 6 taken in the furnace is placed to the furnace wall repairing part and a supporting tube connecting metal 11 is inserted into the furnace wall opening part, having larger diameter than that of the connecting metal 11 beforehand formed on the furnace wall, from outside of the furnace. And, an expansion joint 12 for connecting cooling pipe 13 is expanded and the cooling pipe is joined with the tip thereof. Next, in the inner face of connecting metal 11, the stave supporting tube 14 is screwed and after joining the tip part of supporting tube 14 with the pipe 13 through a blind patch 15, the supporting tube 14 is welded to the iron shell 1 by using a seal metal 9. In this way, an opening part for taking the stave in as the conventional method is not necessary to newly arrange. Further, as this method has the above- mentioned merit, on the repairing work of furnace wall is executed, with the least effect on blast furnace operation.

Description

[Detailed Description of the Invention] <Object of the Invention> Industrial Field of Application The present invention relates to a method for installing a stave for repairing blast furnace wall bricks, and more particularly relates to a method for installing a stave for repairing a damaged part of a furnace wall brick. Installation of staves for repairing blast furnace furnace wall bricks is related to the method.

Conventional technology Figure 8 shows a cross section of the blast furnace mouth and shaft.
In general, bricks at the mouth of a blast furnace are worn out after 4 to 5 years of operation (as shown in the shaded area).
As described in Japanese Patent Application Laid-Open No. 54-26203 (refractory spraying is common, but spraying refractory directly onto the worn brick surface does not provide adhesive strength and the lifespan is approximately 2 to 3 months). , it is not a repair method for extending the S life of the blast furnace.

Therefore, a method has been proposed for installing a new cooling device such as a stave in the damaged area (for example, Japanese Patent Laid-Open No. 60-2607).

FIGS. 9 and 10 are cross-sectional views showing the stave casting 7 of the conventional method attached to the worn brick part of the furnace wall and the state in which the stave is installed in the furnace. In this case, the stave casting 7 is shown in FIG. As shown in the figure, since it is necessary to attach the remaining bricks to the inner surface of the furnace, the length of the casting pipe 8 protruding from the stave body must also be increased by the thickness of the bricks. Furthermore, even if the furnace wall bricks are removed and a new stave is installed as in JP-A No. 60-2607, the length of the casting pipe protruding from the stave body becomes a problem, and the armor plate cannot be removed. It is impossible to take the stave into the furnace using the replacement tube seat 5 (see FIG. 8). Therefore, in the conventional method, it is necessary to newly provide an opening for taking in the stave, which increases the number of man-hours required for construction, which causes problems in blast furnace machinery due to an increase in the number of wind breaks and an increase in the wind break time.

The above-mentioned problems are the same even when the cooling box is installed in the furnace as shown in FIGS. 11 and 12.

Problems to be Solved by the Invention The present invention aims to solve these problems, and specifically, it is possible to take the stave into the furnace using the existing pipe seat (armor plate replacement pipe seat). The purpose of this invention is to provide a method for installing a blast furnace wall brick TI reuse stave with improved stave body structure.

<Structure of the Invention> Means for solving an interfacial FA desk and its operation The present invention provides a retracted expansion joint and an expansion joint at the rear take-out portion of the casting pipe connecting hardware that communicates with the casting pipe of the stave body. A stave for repairing the damaged part of the blast furnace wall, which is equipped with support pipe connection fittings surrounding the blast furnace, is taken into the furnace from the existing furnace top frontage (tube seat for replacing the armor plate), and placed opposite to the VI recovery part. The support pipe connecting hardware is inserted from inside the furnace into the furnace wall opening formed in advance in the furnace, the expansion joint is extended outside the furnace, the cooling pipe is connected to the end thereof, and the support pipe connecting hardware is inserted into the furnace wall opening. The stave support pipe is screwed onto the inside of the furnace from outside the furnace, the end of the stave support pipe and the cooling pipe are joined by a blind plate, and the stave support pipe is further fixed to the furnace shell.

The structure and operation of the present invention will be explained below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view showing an embodiment in which the stave for repairing furnace wall bricks according to the present invention is attached to a repair part, FIG. 2 is a plan view of the stave main body according to the present invention, and FIG. 2 is an enlarged plan view of the casting pipe connecting hardware part in FIG. 2, FIG. 4 is a longitudinal cross-sectional view taken along arrow A-A in FIG. 3, and FIG. FIG. 6 is a longitudinal sectional view showing the process of attaching it to a wall opening, and FIGS. 6 and 7 are a plan view and a ms plane view of the same in the B-B direction applied to a cooling box as another embodiment of the present invention, Figure 8 is a longitudinal sectional view of the blast furnace mouth and shaft, and Figures 9 and 10 are a plan view of a conventional stave and a longitudinal sectional view showing the stave installed in the furnace wall repair section. 11 and 12 are a plan view of a conventional cooling box and a vertical sectional view showing a state in which the cooling box is attached to a furnace wall repair section.

In general, the armor plate replacement tube seat is usually 1500 x
Since the tube seat has an opening of about 500 seconds, in order to take in the stave from the armor plate replacement tube seat, the protruding length of the cast pipe needs to be about 400 aa or less. Due to this limiting condition, in the stave according to the present invention, an expansion joint is joined to the casting pipe, and when the stave body is taken into the furnace with the expansion joint contracted, the expansion joint is extended outside the furnace and the cooling pipe is connected to the expansion joint. It has a structure in which the two are joined together and fixed with a stave support pipe.

An embodiment of the method for installing a stave for furnace wall brick Ill according to the present invention will be explained with reference to FIGS. 1 to 5.

Fig. 1 shows the stave body according to the present invention attached to the furnace wall, where 1 is the iron shell, 2 is the furnace wall brick, and 7 is the stave body attached to the furnace wall.
is a stave casting, 8 is a casting pipe, 9 is a sealing hardware, 10 is a casting pipe connection hardware, 11 is a support pipe connection hardware, 12 is an expansion joint for connecting a cooling pipe, 13 is a cooling pipe, 14 is a stave support pipe, 15 is the date board.

As shown in FIGS. 2 to 4, casting pipe connecting fittings 10 to which the ends of the casting pipe are joined are provided at the four corners of the stave casting 7, and stave support pipe connecting fittings 10 are provided on the shell side of the casting pipe. 11 and a cold section pipe connecting expansion joint 12 are joined by welding or the like. The main body of the stave, which is configured like a mouth, is configured to a size that allows it to be taken in from the armor plate replacement tube seat 5 (see FIG. 8) located at the top of the furnace, and can be easily inserted into the furnace.

The stave body taken into the furnace is placed opposite the furnace wall repair part, and the support pipe connection fitting 11 is inserted into the furnace wall opening having a diameter larger than that of the support tube connection fitting 11 formed in advance on the furnace wall. It is inserted from inside the furnace, the expansion joint 12 for connecting the cooling pipe is stretched out as shown in FIG. 5, and the cooling pipe 13 is joined to the tip of the joint 12 by welding or the like outside the furnace wall.

Next, as shown in FIG. 1, the stave support pipe 14 is screwed onto the inner surface of the stave support pipe connection fitting 11.
4 and the cooling pipe 13 are joined by welding or the like via a blind plate 15, and the stave support pipe 14 and the steel shell 1 are welded together with a seal metal fitting 9.

As described above, the stave main body according to the present invention is firmly attached to the furnace wall, but the reason why the stave support pipe 14, the expansion joint 12 for connecting the cooling pipe, and the cooling pipe 13 are provided to form a double pipe structure is as follows. When the stave support pipe connection hardware 11 and the stave support pipe 14 are threaded together and cooling water is passed directly to the stave support pipe 14, it is difficult to completely seal the threaded joint, resulting in water leakage into the furnace. Since this is a problem, the cooling water supply function and stave support function are separated,
This prevents cooling water from leaking and supports the stave.

Although the stave mounting method has been described above, the method can be similarly applied to a cooling box as shown in FIGS. 6 and 7.

<Effects of the Invention> As explained above, the present invention provides a telescopic joint in a retracted state and a support pipe connecting hardware surrounding the telescopic joint at the rear take-out portion of the casting pipe connecting hardware that communicates with the casting pipe of the stave body. The stave for repairing the IAgA section of the blast furnace wall is taken into the furnace through the existing furnace top opening (pipe seat for armor plate replacement), facing the repair section, and the stave installed in the furnace wall Inserting the support pipe connection hardware into the opening from inside the furnace, extending the expansion joint outside the furnace, and connecting the cooling pipe to the end thereof,
The stave support pipe is screwed into the inside of the support pipe connection hardware from outside the furnace, the end of the stave support pipe and the cooling pipe are joined by a blind plate, and the stave support pipe is further fixed to the furnace shell. The feature is that the stave can be taken into the furnace by using the armor plate replacement pipe seat as the existing pipe seat, so there is no need to create a new opening for taking in the stave as in the past.

Therefore, installing a stave can significantly reduce man-hours, and installing a stave can reduce the number of wind breaks required for construction and shorten the wind break time, minimizing the impact on blast furnace operation and protecting the furnace wall. Repairs can now be made.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an actual 11s embodiment in which the stave for repairing furnace wall bricks according to the present invention is attached to a repair part, FIG. 2 is a plan view of the stave main body according to the present invention, and FIG. FIG. 4 is a longitudinal sectional view taken along arrow A-A in FIG. 6th longitudinal sectional view showing
7 and 7 are a plan view and a longitudinal cross-sectional view in the B-8 direction thereof applied to a cooling box as another embodiment of the present invention, FIG. 8 is a longitudinal cross-sectional view of the blast furnace mouth and shaft portion, and FIG. 9 and Fig. 10 is a plan view of a conventional stave, a vertical cross-sectional view showing a state in which the stave is attached to the recessed part of the furnace wall 11, and Fig. 10.
1 and 12 are a plan view of a conventional cooling box and a longitudinal cross-sectional view showing the state in which the cooling box is attached to a furnace wall repair part. Code 1: Blast furnace shell 2: Furnace wall brick 3: Stave installed during construction 4: Armor plate 5: Armor plate Replacement tube seat 6...
・Stave for furnace wall brick repair 7...Stave casting 8...Cast pipe 9...Seal hardware 10...Cast pipe connection tonight 11... ...Stave support pipe connection hardware 12...
... Expansion joint for connecting cold M pipe 13 ... Cooling pipe 14 ... Stave support pipe 15 ... Blind plate 16 ... Sprayed refractory 17 ...・・・・・・
Cooling box 18...screw part

Claims (1)

[Claims] A stave for repairing a damaged part of a blast furnace wall is provided with a retracted expansion joint and a support pipe connection metal fitting surrounding the expansion joint on the rear side of the casting pipe connecting metal fitting that communicates with the casting pipe of the stave body. Insert into the furnace through the existing furnace top opening (tube seat for armor plate replacement), face the repair part, and insert the support pipe connection hardware from inside the furnace into the furnace wall opening formed in advance in the furnace wall. After extending the expansion joint to the outside of the furnace and connecting the cooling pipe to the end thereof, and screwing the stave support pipe into the inside of the support pipe connection fitting from outside the furnace, the end of the stave support pipe and A method for installing a stave for repairing bricks on a blast furnace wall, characterized by joining a cooling pipe with a blind plate and further fixing a stave support pipe to a furnace shell.