JPH0394008A - Stave cooler - Google Patents

Abstract

PURPOSE:To shorten constructing period, to restrain the development of heat crack and to improve wear resistance by forming plural recessed parts demarcated with ribs on surface inner side of a furnace of a stave cooler body. CONSTITUTION:The ribs 2 are formed as net-state on the surface inner side of the furnace of stave 1 by integrally casting and plural hexagonal, triangular and rhombic recessed parts 3 demarcated with the ribs 2 are formed. By forming the ribs 2, even if the heat crack is developed on the surface of stave 1, spread of the crack to the whole can be prevented. Further, by forming the recessed part 3, as charging material in the blast furnace is stayed on the recessed parts 3, the effect of self-lining to the charging material is displayed and the wear resistance is improved and the wear of stave 1 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stave cooler provided on a furnace wall for cooling a furnace body of a blast furnace.

[Conventional technology]

Conventional stave coolers for cooling the blast furnace body (hereinafter referred to as staves) generally use a stave 100 made of cast-in bricks 10, as shown in Figures 5 and 6. In order to prevent the cast-in bricks 10 from falling off and to increase heat resistance, brickwork 1 is placed on the inner side of the furnace.
I'm doing 2.

Note that 10a is a bolt for attaching to the iron shell.

■Recently, in order to shorten the blast furnace construction period,
In some cases, the brickwork inside the furnace is omitted. in this case,
In order to increase the holding power of the cast-in brick, a trapezoidal encasing brick 13 as shown in Japanese Patent Application Laid-Open No. 1-127610 is often used on the inside of the cast-in brick 10 inside the furnace.

In addition, staves have recently been replaced during blast furnace operation, but as shown in Figures 8 and 9, only cast staves are used due to weight restrictions during replacement. A stave 102 consisting of a. 102a is a mounting bolt.

[Problem to be solved by the invention]

However, each of the conventional staves 100 to 102 has the following drawbacks.

(2) The stave 100 requires a process of laying bricks on the inner surface of the stave, which lengthens the construction period of the blast furnace. Additionally, brickwork and cast-in bricks tend to crack or fall off relatively easily.

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

■In the stave 101, although the retaining force of the bricks is increased by using a built-in brick, since the coefficient of thermal expansion of the cast metal is higher, cracks occur and grow in the bricks due to thermal deformation of the cast metal, and the bricks become 2 It will fall off after 3 years, leaving only cast iron. When this happens, the castings are directly exposed to the high heat in the furnace, which increases the shrinkage caused by the heat and causes thermal cracks to occur. Furthermore, if this crack grows and connects to the cooling pipe inside the casting, it will be necessary to operate with the cooling pipe blind for safety reasons, and the cooling capacity of that part will be lost, which will have a negative impact on the subsequent life of the blast furnace. affect

In addition, to use the stave 101 as a replacement stave, it is too heavy because it includes bricks, and is not suitable for replacement work during blast furnace operation.

■Since the stave 102 is made of only cast metal from the beginning, it is lightweight and useful as a replacement staple during blast furnace operation.
Similarly, it is susceptible to thermal deformation, and there are still problems such as thermal cracks reaching the cooling pipes and cracks forming near the stave mounting bolt holes.

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

[Means to solve the problem]

The above-mentioned problem is solved in a stave cooler for a blast furnace by forming ribs or a large number of recesses on the furnace inner surface of the stave cooler main body, and making the furnace inner surface directly facing the inside of the furnace.

[For production]

In the present invention, when manufacturing the stave, there is no need to cast-in the bricks, making the manufacturing process easy and inexpensive.

Furthermore, since it does not have bricks when installed in a blast furnace, it is lightweight and has excellent workability, making it useful as a replacement during blast furnace operation. Furthermore, brickwork is not required on the inside of the stave furnace, and the construction period for blast furnace construction 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 thermal load is applied locally, no internal stress is applied to the rib, thereby preventing thermal deformation of the entire stave.

Furthermore, even if minute cracks occur from the surface, the cracks stop progressing at the base of the ribs, making it possible to suppress the cracks to a minimum.

On the other hand, since the furnace inner surface of the stave faces directly into the furnace, it comes into direct contact with the blast furnace charging material, and during operation, the charging material stays in the many recesses, causing the charging material to On the other hand, since it acts as a self-lining, it is possible to prevent wear.

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

[Specific structure of the invention]

Hereinafter, the present invention will be explained in more detail based on the drawings.

FIG. 1 is a front view of a stave according to the present invention, and FIG. 2 is a side view thereof. On the furnace inner surface of the stave 1, mesh-like ribs 2 are formed by casting integrally with the main body, and a large number of hexagonal, triangular, and rhombic four parts 3 are defined by the ribs 2. . Reference numeral 4 denotes a mounting bolt hole formed in the protrusion 6, which is used when the stave 1 is attached to a blast furnace shell (not shown). 5 is a cooling pipe through which cooling water for cooling the blast furnace body flows, and 7 is a hanging hook.

When the ribs 2 are formed on the inner surface of the stave in this manner, even if thermal cracks occur on the stave surface, the cracks will stop progressing at the base of the ribs 2, thereby preventing the cracks from spreading to the entire surface. On the other hand, since the recess 3 is formed, the charging material for the blast furnace accumulates in the recess 3, which has a self-lining effect on the charging material, increasing wear resistance and reducing stave wear. can be prevented.

FIG. 3 shows another embodiment of the invention. In this case rib 2
It is basically the same as the previous example except that it is formed in a lattice shape and the recesses are rectangular. In addition, the shape of the ribs is not limited, such as having a hexagonal shape on the entire surface.

Preferred rib dimensions in the present invention will be explained with reference to the example of FIG. 4. It is preferable that the dimensions of each part indicated by each symbol in the figure take the following numerical values.

Tortoise shell pattern or rectangular dimension
10 to 100 mm: Curvature R > 2 m
m Furthermore, the hole for the stave mounting bolt is preferably round rather than square. Since the bolt holes penetrate into the furnace, if they are rectangular, thermal cracks often occur from the corners, but by making them round, there is no starting point for thermal cracks.

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

〔Example〕

Next, examples will clarify the effects of the present invention.

During the operation of a certain blast furnace, the stave according to the present invention (as shown in FIGS. 1 to 3) was used to replace the shaft stave. As a result, it was found that the ribbed stave of the present invention has superior heat resistance (heat cracking resistance) and wear resistance compared to a flat stave without recesses (no ribs), as shown in Table 1. did.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to shorten the construction period of a blast furnace, and to provide a stave cooler that is less prone to thermal cracking and has high wear resistance.

[Brief explanation of drawings]

FIG. 1 is a front view of a first example of a stave 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 an example of the dimensions of the 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 diagram of another conventional stave. A side view, FIG. 8 is a perspective view of still another conventional stave, and FIG.
The figure is a side view thereof. 1... stave, 2... rib, 3... recess, 4...
・Holt mounting hole, 5...Cooling pipe, 10...
Cast-in brick, 11...iron shell, l3...embroidered brick. l0 Fig. 1 JP-A No. 3-94008 (4) Fig. 2 Fig. 3 Fig. 5 Fig. 6 Fig. 7 Fig. 8 JP-A No. 3-94008 (6)

Claims (1)

[Claims] (1) A stave cooler for a blast furnace, characterized in that a large number of recesses are defined by ribs on the inside surface of the stave cooler main body, and the inside surface of the furnace directly faces the inside of the furnace.