JPH028001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cast iron stave in which a cooling pipe for cooling a blast furnace body is cast, and a method for installing the stave.

Conventionally, the stave installation method was as shown in Figures 1 and 2.
As shown in FIG. 3, a stave 2 in which a cooling pipe 1 is cast is fixed to an iron shell 5 with mounting bolts 3 and nuts 4. 2 and 3 show a cross section of the blast furnace with the stave 2 attached to the shell 5. The shape of the conventional stave 2 has an angle (α) toward the center of the furnace.
It will be divided and arranged. As a result, in the single cross-sectional shape of the stave 2, the chord dimension B outside the furnace is larger than the chord dimension A inside the furnace. Note that if the outer chord dimension B of all the staves 2 around the circumference is made larger than the inner chord dimension A, it will be impossible to install the stave 2, so only one stave around the circumference has the inner chord dimension A.
A straight type stave 2b having the same chord dimension B outside the furnace is arranged.

A gap (β) of 20 mm to 40 mm is provided between the staves, and this gap (β) is filled with refractory material 6 after the stave 2 is attached to the iron shell 5.

Since the conventional blast furnace stave has the shape and mounting method described above, it has the following drawbacks.

In other words, (1) Since the outer chord dimension B of the stave 2 is larger than the inner chord dimension A, the installation order of the stave 2 must be such that the straight type stave 2b is installed last, which requires a lot of installation work. It cannot be done individually.

(2) After all the staves 2 around the circumference have been installed, there is a facility defect in the stave 2a other than the straight type stave 2b, and the stave 2 with this defect
If you are trying to replace stave 2a,
Since the chord dimension B outside the furnace is larger than the chord dimension A inside the furnace, extrusion to the inside of the furnace is impossible. Therefore, the straight type stave 2b is first pushed out to the inside of the furnace and removed, then the stave 2a-2 next to the straight type stave 2b, then the stave 2a-1 next to it, and so on until the defective stave is removed. The stave 2a must be removed.

(3) Refractory 6 is filled between the staves, so after filling with this refractory 6, discover any equipment defects in the staves, fill with refractory 6, and push the defective stave into the furnace. However, it could not be extruded properly and it was impossible to replace it. This means that defective staves cannot be replaced during wind breaks during blast furnace operation. That is, even if five to six years have passed since the blast furnace was started and the stave has progressed to wear due to the heat inside the furnace or the contents, the defective stave cannot be replaced. If the stave is not replaced and the wear progresses further, the cooling pipe 1 inside the stave will become exposed, and there is a fear that the cooling pipe 1 will progress to wear and that there will be an accident in which the cooling pipe 1 is damaged. If this cooling pipe 1 becomes unusable, a part of the blast furnace body will not be cooled, and there is a risk of accidents such as abnormal heating of the shell 5 or cracks occurring in the shell 5, and the blast furnace will be shut down at an early stage. (change of volume) will have to be done.

This invention was made in order to eliminate the drawbacks of the conventional staves as described above, and the gist of the invention is to provide a blast furnace stave that has a built-in cooling pipe and cools the furnace body. Dimension A
A blast furnace stave whose diameter is larger than the outside chord dimension B. And one or more blast furnace staves whose cross-sectional shape inner chord dimension A is larger than the outer chord dimension B are placed every other one or more blast furnace staves whose inner chord dimension A is smaller than the outer chord dimension B. The present invention is described below with reference to the drawings.

In FIGS. 4 and 5, the stave shown as 2c is the stave of the present invention, and its horizontal cross section is formed such that the chord dimension A on the inside of the furnace is larger than the chord dimension B on the outside of the furnace.

When installing the staves 2c in the furnace body, staves 2c are arranged every other stave 2a (inner chord dimension A is smaller than outer chord dimension B) as shown in FIGS. 4 and 5.

When installing the staves, the stave 2a whose outer chord dimension B is larger than the inner chord dimension A is first attached, and then the stave 2c is attached, so that many operations can be performed simultaneously in the circumferential direction.

Figures 6, 7, and 8 show the stave 2 of the present invention.
This shows another example of attaching c to the furnace body.
In the figure, two pieces 2a are arranged every 2a-3 and 2a-4, and a stave is used in which the dividing line X of the mating surfaces of 2a-3 and 2a-4 faces the normal line. Figure 7 shows three 2a 2a-3, 2a-4, 2
Placed every a-5, 2a-5 and 2a-
The dividing line X of the mating surfaces of 3, 2a-5, and 2a-4 is the normal direction (i.e., 2a-5=2a-4).
2) A shaped stave is used. FIG. 8 shows a modified example of the stave 2c, in which the parting line X of the mating surface with 2c-1 and 2c-2 is in the latent line direction.

In this way, according to the present invention, the furnace chord dimension A
Since the stave 2c is arranged so that the diameter is larger than the outer chord dimension B, even after filling the refractory 6 between the stave 2a and the stave 2c, the stave 2c
c can be easily pushed out into the furnace, and the stave can be removed. The installation work during construction is also done using the furnace inner chord dimension A.
Finally, the stave 2c, which is larger than the outside chord dimension B, is attached. In other words, the installation work can be done at any number of locations, making it possible to shorten the construction period. Furthermore, even if the stave wear progresses after the blast furnace is fired and it becomes necessary to replace the stave, the stave 2c, whose inner chord dimension A is larger than the outer chord dimension B, can be easily pushed out into the furnace and removed. can. In this embodiment, in which the staves 2c whose inner chord dimension A is larger than the outer chord dimension B are arranged every other stave 2a, the number of units (blocks) to be removed can be three at most. In this way, a large number of staves arranged around the circumference are used to create a large number of blocks during a short wind break (the normal wind break time is about 12 hours, as the blast furnace is temporarily stopped for maintenance during operation of the blast furnace). It can be removed and installed in parts. By making it possible to replace the stave after firing, abnormal heating and cracking of the blast furnace shell 5 can be prevented, and the life of the blast furnace can be significantly extended, among other effects. .

Next, in a blast furnace employing the stave 2c according to the present invention, a specific method for removing and attaching these staves when the blast furnace is at rest will be described.

Figure 9 shows a state in which a lifting machine 7 is installed above the gas collection mantel 9 and a rope 8 for hanging the stave 2 is installed in order to remove and attach the stave 2 during blast furnace operation. .

First, in Fig. 10, remove the bolt 3 that attaches the stave 2, and insert the rope 8 into the bolt hole.
Attract. Next, as shown in FIG. 11, ropes 11 and 13 are attached to the rear end of the cooling pipe 1 and pulled by a chain block (not shown) installed at an appropriate location outside the furnace. Remove. A jack or cylinder 1 is installed on the outside of the furnace in the cooling pipe 1 in order to push the stave 2 into the furnace.
2, and loosen the ropes 11 and 13 while gradually pushing the stave 2 toward the inside of the furnace using the jack 12. The state in which it is pushed out by this jack 12 is shown in FIG. Rope 1 from the state shown in Figure 12
1 and rope 13 are gradually loosened, and the state shown in FIG. 13 is obtained. Winding up the rope 8 from the state shown in Fig. 13, opening 1 installed in the gas collection mantel 9
0 to the outside of the furnace. Although the removal procedure has been described above, the installation procedure can be done by reversing the above procedure.

Figures 14, 15, and 16 show a stave 2c in which the inner chord dimension A is larger than the outer chord dimension B.
This figure shows the procedure when an opening 17 for taking out the stave 2 is provided in the iron skin 5 on the back side of the iron shell 5. First of all, the procedure up to Figure 14 is almost the same as Figures 10 and 11.
12 and 13. 14th
In the figure, the rope 16 passes through the opening 17 of the steel shell 5 and is pulled by a chain block (not shown) installed at an appropriate location outside the furnace, and the stave 2c is gradually suspended horizontally by the ropes 8 and 16. Rope 1 as shown in Figure 15 from the horizontal position.
5, pull it to the outside of the furnace. Pull the stave 2c further outside the furnace using the rope 15 from the state shown in FIG. 15. When the stave 2c is in the position shown in FIG. Remove. Further, a rope 18 outside the furnace is attached to the bolt hole where the rope 8 was removed, and the stave 2c is lifted up by the ropes 16 and 18 and moved to an appropriate location outside the furnace. Although the removal procedure has been described above, the installation procedure can be done by reversing the above procedure.

As explained above, according to the present invention, it is now possible to replace the stave during operation, which was previously impossible, with great ease, and it has great practical value.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view showing the installation state of the stave;
FIG. 2 is a cross-sectional view of a blast furnace showing a conventional stave installed state, FIG. 3 is a partially enlarged view of FIG. 2, and FIG. 4 is a cross-sectional view of a blast furnace showing a stave installed state in an embodiment of the present invention. Figure 5 is a partially enlarged view of Figure 4.
6, 7, and 8 are partially enlarged cross-sectional views of a blast furnace showing stave installation states in other embodiments of the present invention, and FIGS. 9, 10, 11, and 12.
13, 14, 15, and 16 are explanatory views of the procedure for removing and installing the stave of the present invention. A...Stave inner chord dimension, B...Stave outer chord dimension, α...Stave split angle, β
... Clearance between staves, 1 ... Cooling pipe, 2, 2a, 2c ... Stave, 3 ... Bolt, 4 ... Nut, 5 ... Iron shell, 6 ... Refractory,
7... Lifting machine, 8, 11, 13, 14, 15, 1
6, 18...rope, 9...gas collection mantel,
10, 17...opening, 12...jacket or cylinder.

Claims (1)

[Scope of Claims] 1. A blast furnace stave with a built-in cooling pipe for cooling the furnace body, in which the furnace inner chord dimension A of the cross-sectional shape of the stave is larger than the furnace outer chord dimension B. 2. Place one or more blast furnace staves whose cross-sectional shape inside the furnace chord dimension A is larger than the outside chord dimension B, and every other one or more blast furnace staves whose inside chord dimension A is smaller than the outside chord dimension B. How to install blast furnace staves that are built into the steel shell and installed in parallel in the circumferential direction.