JPH11199909A - Stave cooler for blast furnace and structure for holding monolithic refractory at back surface part thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely hold monolithic refractory at the back surface part of a stave cooler for blast furnace in order to cool the furnace wall part of the blast furnace so as not to fall down even in the case of partially exposing this refractory to the furnace gas. SOLUTION: Studs 2 are arranged at the back surface iron shell side of the stave cooler 1 for blast furnace. Further, the stave cooler 1 for blast furnace is disposed in the blast furnace along the inner surface shape of the iron shell 3, and the studs 2 are arranged also in water cooling piping 5 disposed between the stave cooler 1 for blast furnace and the iron shell 3. The monolithic refractory 4 filled on the back surface of the stave cooler 1 for blast furnace is held with these studs 2. The protecting effect of the iron shell is raised and the stable producing operation can be continued by reducing the heat and the physical loads given to the iron shell on the outer surface of the blast furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stave cooler for a blast furnace and an irregular-shaped refractory holding structure for a rear portion thereof.

[0002]

2. Description of the Related Art As shown in FIG. 2, in a blast furnace 9 in which a furnace wall is cooled by a cooling board and a refractory brick, when the refractory brick is damaged, heat and physical load applied to a steel shell on the outer surface of the blast furnace are damaged. In order to reduce the damage, the cooling means for the portion where the refractory is damaged is changed from a cooling board and a refractory brick to a stave cooler 1 as shown in the back (FIG. 3 (a)) and the side (FIG. 3 (b)) in FIG. May be taken. At this time, the range in which the cooling means is changed to the stave cooler 1 is that when the blast furnace 9 is in operation, it is not possible to secure a break time for performing the construction, and to scrape out all the contents in the blast furnace. Is impossible, so it is limited to the upper part of the blast furnace. That is, as shown in FIG. 2, the part A of the blast furnace 9 has been conventionally cooled by a stave cooler, and the parts B and C have been cooled using a cooling plate and a refractory brick. Since the contents of section B can be removed but the contents of section C cannot be removed, the cooling means of section C cannot be changed to a stave cooler. Will be changed to For this reason, after changing the cooling means, the furnace wall at the upper part of the blast furnace (parts A and B) is cooled by the stave cooler, and the lower part of the blast furnace (part C) is cooled by the cooling plate and the refractory brick.

[0003]

FIG. 4 is a front view of a boundary portion between a cooling portion by a cooling plate below a stove cooler for a blast furnace, that is, a boundary portion between portions B and C in FIG. 2 (FIG. 4A). And a side view (FIG. 2B). When the stave cooler 1 is arranged on the inner surface of the furnace in consideration of the smoothing of the profile in the furnace, the steel shell 3
And a gap of about 100 to 300 mm is generated between them. This gap is filled with an irregular refractory 4 to block the steel shell 3 from the gas inside the furnace. However, only cooling plates 8 are arranged in a staggered manner below the stave cooler 1. Refractory 4 filled in the back of stave cooler 1
Is partially exposed to the furnace gas at the lower part. Moreover, in the operating blast furnace, it is not possible to significantly change the inner surface of the furnace where the brick receiving hardware is present due to restrictions on the blast furnace operation. It is not possible to install around the blast furnace from the viewpoint of the strength of the steel shell on the outer surface of the blast furnace.

The irregular-shaped refractory 4 filled in the back of the stove cooler is exposed to the furnace gas from the lower part and deteriorates and deteriorates due to the reaction with the furnace gas with the passage of time. May fall off. As the lower refractories fall from the lower refractories into the upper refractories, the blast furnace steel is exposed to the gas inside the furnace, generating heat and physical loads, resulting in stable production. It becomes difficult to continue activities.

[0005] Japanese Patent Application Laid-Open No. 5-105923 discloses that a cooling plate is bent upward or downward in parallel with the shape of the steel shell in the furnace from the center to the front, and a stud is provided at a portion facing the steel shell. It is described. But,
This is a countermeasure in the case of using a cooling board, and does not prevent the irregular refractory filled in the rear part of the stave cooler from falling off.

Accordingly, the present invention provides a means for holding the irregular-shaped refractory on the back of the stave cooler to prevent the refractory from falling off.

[0007]

SUMMARY OF THE INVENTION The present invention provides a stave cooler for a blast furnace, wherein a stud for holding an irregular refractory is provided on the back steel side, and an irregular refractory on the back steel side. A stove cooler for blast furnaces with studs for holding the blast furnace is placed inside the blast furnace along the shape of the inner surface of the steel shell, and a stud that holds the irregular refractory also in the water cooling pipe placed between the stave cooler for blast furnace and the steel shell. This is an irregular-shaped refractory holding structure for a rear surface of a stove cooler for a blast furnace, characterized by being provided with:

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The conventional stave cooler 1 shown in FIG. 3 has a projection 7 for attaching a protection pipe 6 for protecting a cooling pipe cast in the stave cooler 1 on the back. The other parts had a planar shape. Therefore, there was no function of holding the irregular-shaped refractory on the back of the stave cooler 1. Therefore, in the present invention, as shown in FIGS. 1A and 1B, a stud 2 for holding an irregular refractory is provided on the back surface of the stave cooler 1.

When the stave cooler 1 of the present invention is arranged in a blast furnace along the inner surface of a steel shell, FIG.
As shown in the figure, a water cooling pipe 5 disposed between the stave cooler 1 and the steel shell 3 is also provided with a stud 2 for holding an amorphous refractory.
Was decided. FIG. 1C shows a planar shape of a water cooling pipe 5 provided with a stud 2.

As described above, the stud is provided on the back surface of the stave cooler, and when the stave cooler is disposed in the blast furnace, the stud is also provided on the water cooling pipe disposed between the stave cooler and the steel shell. Thereby, the irregular-shaped refractory filled in the back of the stave cooler can be reliably held. Even if the irregular refractory at the bottom of the stave cooler is exposed to the gas inside the furnace and falls off partially, the stud retainer prevents the falling from progressing to the irregular refractory at the top. The irregular-shaped refractory on the back side can be held for a long period of time, and the heat and the physical load applied to the outer shell of the blast furnace can be reduced.

[0011]

EXAMPLE In a blast furnace having a furnace capacity of 4000 m ³ class, as shown in FIG. 1, a blast furnace stave cooler 1 provided with a stud 2 on the back steel side is disposed in the blast furnace along the inner shape of the steel shell. Studs 2 were also provided in a water cooling pipe 5 disposed between the stove cooler 1 for the blast furnace and the steel shell 3, and the gap between the stave cooler 1 and the steel shell 3 was filled with the irregular-shaped refractory 4. As a result, the amorphous refractory 4 did not fall off, the heat and the physical load applied to the blast furnace steel 3 were reduced, and stable production activities could be continued.

[0012]

In Comparative Example] furnace volume 4000 m ³ grade blast furnace, as shown in FIG. 3, only by installing a conventional stave cooler having only projections 7 for mounting the protective pipe to the rear portion, stave coolers and Tetsugawa When the amorphous refractory was filled in the space between the refractory, the amorphous refractory was exposed to the gas in the furnace and deteriorated, and all the amorphous refractory fell off. For this reason, heat and physical load on the blast furnace steel shell have increased, and it has become difficult to continue stable production activities.

[0013]

According to the present invention, even if there is a portion of the irregular refractory on the back of the stave cooler exposed to the furnace gas, the irregular refractory on the back of the stave cooler is securely held to prevent falling off. It is possible to reduce the heat and the physical load on the blast furnace steel, improve the protection effect of the steel, and continue stable production activities.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a stove cooler for a blast furnace of the present invention and an irregular-shaped refractory holding structure on the back surface thereof.

FIG. 2 is a diagram showing a difference in cooling means in a height direction of a blast furnace.

FIG. 3 is a diagram showing a conventional blast furnace stave cooler.

FIG. 4 is a view showing a boundary portion between a cooling portion of a lower part of a blast furnace stave cooler and a cooling portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stave cooler 2 Stud 3 Steel 4 Unshaped refractory 5 Water cooling pipe 6 Protection pipe 7 Projection 8 Cooling board 9 Blast furnace

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Inada Akira 46-59 Nakahara, Tobata-ku, Kitakyushu Nippon Steel Corporation Engineering Department (72) Inventor Kazuyoshi Watanabe 46, Ohara Nakahara, Tobata-ku, Kitakyushu −59 Nippon Steel Corporation Engineering Division

Claims (2)

[Claims] 1. A stove cooler for a blast furnace, wherein a stud for holding an irregular-shaped refractory is provided on the back side of the steel shell. 2. A blast furnace stove cooler provided with a stud for holding an amorphous refractory on a back steel shell side is disposed in the blast furnace along the inner shape of the steel shell, and a stove cooler for the blast furnace is disposed between the stove cooler and the steel shell. An irregular-shaped refractory holding structure for a rear part of a stove cooler for a blast furnace, wherein a stud for holding an irregular-shaped refractory is provided also in a water cooling pipe to be arranged.