JPH0663011B2 - Stave cooler for new blast furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a new stave cooler provided on a furnace wall for cooling a furnace body of a blast furnace.

[Conventional technology]

As a conventional stave cooler for cooling a blast furnace body (hereinafter referred to as a stave), a stave 100 in which a brick 10 is cast-in and produced is often used as shown in FIGS. 5 and 6, and in this case, In order to prevent the cast-in bricks 10 from falling off and to increase the heat resistance, bricks are stacked on the inner surface of the furnace 12.
Are doing In addition, 10a is a mounting bolt for the iron shell.

Recently, in order to shorten the blast furnace construction period,
In some cases, brickwork inside the furnace is omitted. in this case,
In order to enhance the holding power of the cast-in brick, as shown in FIG. 7, a trapezoidal embracing brick 13 is used inside the furnace of the stave 101 as shown in JP-A-1-127610. Often.

Also, the replacement of staves during the operation of the blast furnace has come to be performed recently, but this is the 8th stave for replacement.
As shown in FIG. 9 and FIG. 9, the stave 102 made of only castings is generally used due to the weight limitation at the time of replacement. 102a is a mounting bolt.

[Problems to be Solved by the Invention]

However, the conventional staves 100 to 102 have the following drawbacks.

The stave 100 requires a step of brick-laying on the inner surface side of the stave, which prolongs the blast furnace construction period. In addition, cracks easily occur in brick piles and cast bricks, and they tend to fall off.

Further, since this stave 100 contains the cast-in brick 10, it is too heavy to use as a replacement stave during blast furnace operation.

In the stave 101, although the holding power of the brick is increased in the form of a hugging brick, since the casting has a higher coefficient of thermal expansion, cracks are generated and grow in the brick due to thermal deformation of the casting. It has fallen off in three years, leaving only castings. Then, since the casting directly receives the high heat in the furnace, the shrinkage due to the heat becomes large, and the thermal crack is generated and grows. Furthermore, if these cracks grow and connect to the cooling pipe inside the casting, it is necessary to blindly operate the cooling pipe for safety, the cooling capacity of that part is lost, and the blast furnace life after that is adversely affected. Exert.

Further, since the stave 101 is used as a replacement stave, since it contains bricks, the weight is too large and it is not suitable for replacement work during blast furnace operation.

In the stave 102, since it is composed of only castings from the beginning, it is lightweight and useful as a replacement stave during blast furnace operation, like the stave 101 after brick dropout, is weak in thermal deformation, and has thermal cracks. Problems such as reaching the cooling pipes and cracking near the stave mounting bolt holes still remain.

Therefore, a main object of the present invention is to provide a stave cooler which can shorten the blast furnace construction period, is excellent in thermal deformation resistance, is resistant to thermal crack growth, and has high wear resistance.

[Means for Solving the Problems]

In the newly installed blast furnace stave cooler, ribs with a substantially constant thickness and a protruding height of 10 to 100 mm are formed in a mesh shape on the inner surface of the stave cooler body to form a large number of recesses. This can be solved by directly facing the inner surface of the furnace without bricks into the blast furnace.

[Action]

According to the present invention, it is not necessary to cast and embed bricks at the time of manufacturing the stave, and the manufacturing becomes easy and inexpensive.
In addition, when it is attached to the blast furnace, it is lightweight because it has no bricks, so it is excellent in workability and is useful as a replacement during operation of the blast furnace. Furthermore, brick laying is not required inside the furnace of the stave, and the blast furnace construction period can be shortened accordingly.

In addition, a large number of recesses defined by ribs are formed on the inner surface of the furnace. As a result, even if a large heat load is locally applied, internal stress does not work at the rib portion, and thermal deformation of the entire stave can be prevented. Further, even if a fine crack is formed on the surface, the progress of the crack stops at the root of the rib, and the crack can be suppressed to the minimum.

On the other hand, since the furnace inner surface of the stave was directly exposed to the furnace, it came into direct contact with the blast furnace charging material, and the charging material stayed in many recesses during operation, and this became the charging material. On the other hand, since it plays the role of self-lining, it is possible to prevent wear. That is, the stave wears due to contact with the raw material for the interior of the furnace (iron ore, sinter, coke, etc.). However, according to the present invention, since a large number of concave portions defined by ribs having a protruding height of 10 to 100 mm are formed on the inner surface of the furnace, the raw material for furnace interior is retained in each concave portion, and The sliding wear between the furnace interior feed material and the stave furnace inner surface can be replaced by the above-described sliding wear between the stagnant raw material and the furnace raw material, and as a result, wear of the stave furnace inner surface can be ensured by the cell lining action. Can be prevented.

The presence of the ribs also has the effect of increasing the rigidity of the stave and preventing repeated deformation along the cross section of the stave.

[Specific configuration of the invention]

 Hereinafter, the present invention will be described more specifically with reference to the drawings.

FIG. 1 is a front view of a stave according to the present invention, and FIG. 2 is a side view thereof. Ribs 2 are formed in a mesh shape on the furnace inner surface of the stave 1 integrally with the main body of the stave 1, and a large number of hexagonal, triangular and rhombic recesses 3 are defined by the ribs 2. . Reference numeral 4 is a mounting bolt hole formed in the protrusion 6, which is used when the stave 1 is mounted on a blast furnace iron shell (not shown). Reference numeral 5 is a cooling pipe for circulating cooling water for cooling the furnace body of the blast furnace, and 7 is a hanging hook.

As described above, when the ribs 2 are formed on the inner surface of the stave in the furnace, even if a thermal crack occurs on the surface of the stave, the progress of the crack stops at the root of the rib 2, and the spread of the crack can be prevented. On the other hand, since the concave portion 3 is formed, the charging material of the blast furnace is accumulated in the concave portion 3, which has the effect of cell lining on the charging material, which increases wear resistance and wear of the stave. Can be prevented.

FIG. 3 shows another embodiment of the present invention. In this case rib 2
Is basically the same as the above example except that the concave portions are formed in a lattice shape and the concave portions are rectangular. In addition, the shape of the mesh is not limited, for example, the rib has a hexagonal shape over the entire surface.

In addition, as a mode of forming the rib, it is more effective to cross at an angle other than a right angle in order to reduce thermal stress, rather than to cross at a right angle.

As a preferable rib size in the present invention, referring to the example of FIG. 4, it is preferable that the size of each part shown by each symbol in the drawing takes the following numerical values.

Turtle pattern or rectangular dimension X = 50 to 800 mm Turtle pattern or rectangular dimension Y = 50 to 1000 mm Rib: Thickness d = 10 to 100 mm 〃: Height h = 10 to 100 mm 〃: Curvature R> 2 mm Where, rib protrusion 10m for height h of 10-100mm
If it is less than m, not only is the strength improved inferior, but also the above-mentioned cell-lining effect cannot be expected by making the particle size of the charging material of the blast furnace or more. Also, when it exceeds 100 mm,
Since the thickness of the stave cooler main body is required to be the minimum due to the need to embed the cooling pipe, the thickness of the entire stave cooler increases, which is also against the purpose of weight reduction.

Also, the hole for the stave mounting bolt is
A round shape is preferable. Since this bolt hole is penetrated to the inside of the furnace, in the case of a square shape, a thermal crack often occurs from the corner, but by making it round, the starting point of the thermal crack disappears.

On the other hand, the ribs can be formed on the side surface of the stave to increase rigidity.

〔Example〕

 Next, the effects of the present invention will be clarified by Examples.

During the operation of a certain blast furnace, the stave according to the present invention (as described in FIGS. 1 to 3) was used to replace the shaft stave. As a result, as shown in Table 1, it was found that the ribbed stave of the present invention is superior in heat resistance (heat crack resistance) and wear resistance as compared with a flat stave without recesses (without ribs). did.

[Advantages of the Invention] As described above, according to the present invention, it is possible to provide a stave cooler that can shorten the blast furnace construction period, is less likely to grow thermal cracks, and has high wear resistance.

[Brief description of drawings]

FIG. 1 is a front view of a first stave example according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a perspective view showing another example of the present invention,
FIG. 4 is a partial perspective view for explaining a dimension example of a stave according to the present invention, FIG. 5 is a perspective view of a conventional stave, FIG. 6 is a side view thereof, and FIG. 7 is a conventional stave. A side view and FIG. 8 are perspective views of still another conventional stave, and FIG.
The figure is a side view thereof. DESCRIPTION OF SYMBOLS 1 ... Stave, 2 ... rib, 3 ... concave, 4 ... bolt mounting hole, 5 ... cooling pipe, 10 ... cast brick, 11 ... iron skin, 13 ... embracing brick.

Claims (1)

[Claims] 1. A newly installed blast furnace stave cooler, comprising a plurality of recesses formed in a mesh shape by ribs having a substantially constant thickness and a protruding height of 10 to 100 mm on the inner surface of the stave cooler body. A stave cooler for a new blast furnace, characterized in that the inner surface of the furnace having no brick is directly exposed to the blast furnace.