JP2000290711A - Stave cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a means for prolonging the service life of a stave cooler. SOLUTION: The stave cooler has a structure, in which bricks 15a are placed side by side in the lateral direction in a furnace and plural brick lines are placed with the interval to each line, and cooling pipings for circulating cooling medium and disposed at the iron shell side in the opposite side to the inside of a furnace, and these pipings are inserted with a cast iron 17 and the bricks are interposed with ribs formed with the cast iron. To the back surface of the bricks at the inside of the bricks, too, the cooling pipings 1 are additionally disposed, and a header tube 16b for the additionally disposed cooling piping 1 is commonly used with the header tube for cooling tube 12b disposed at the iron shell side, and further, the circular flow-in of the cooling medium into both pipings can be changed over.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stave cooler used for cooling a furnace wall of a blast furnace or the like.

[0002]

2. Description of the Related Art FIG. 2 is a horizontal sectional view showing a state in which a stove cooler 11 is attached to a blast furnace. As shown in the figure, a stave cooler 11 into which a main cooling pipe 12a and a rear cooling pipe 12b are cast is divided in a circumferential direction on an inner peripheral surface of a steel shell 13 of a blast furnace, and joints 14 between the stove coolers 11 are provided. Is filled with stamp material.
As shown in the vertical sectional view of FIG. 3, each of the stave coolers 11 forms a brick row 15 in which bricks are arranged side by side inside the furnace, and the brick rows 15 are arranged in a plurality of steps at intervals. The main cooling pipe 12a and the rear cooling pipe 12b arranged on the steel shell side are led out of the steel shell and connected to the header 16. The entire structure is cast with cast iron 17.

In the stave cooler 11, the inner surface of the stove cooler 11 wears down due to a drop of the charge in the stove. The wear rate is greatly affected by the temperature of the operating surface of the stave cooler. Therefore, how to lower the operating surface temperature is an issue, but in order to extend the life of the blast furnace, the cooling pipe 12
Was made as close as possible to the blast furnace steel shell 13 side. However, bringing the cooling pipe 12 closer to the steel shell 13 of the blast furnace increases the temperature of the operating surface of the brick 15 cast into the stave cooler 11 and also holds the ribs of the stave cooler 11 holding the brick 15. This also led to a decrease in the power, which could result in an increase in the brick wear rate in the early stage of operation of the blast furnace and the possibility of the bricks falling off, which had a major effect on the life of the blast furnace. Therefore, many proposals have been made for long life of the blast furnace.

For example, the applicant of the present application has previously filed Japanese Patent Application No.
No. 82738 discloses a structure in which rows of two types of bricks having different lengths in the depth direction from the inside of the furnace are alternately arranged. This is because, in the conventional stove cooler, the bricks cast with cast iron move from the inside of the furnace in the depth direction.
Because of the split structure that becomes a layer, preventing the falling off of bricks in the process of wear of the stave cooler, two rows of bricks with different lengths from the furnace inside to the depth direction are arranged alternately This is prevented by adopting a modified structure.

Further, Japanese Patent Application No. 8-29709 proposes a structure in which the horizontal cross section of a stave is changed by a difference in the degree of cooling by a cooling pipe.

[0006]

The problem to be solved by the present invention is to find another means for extending the life of the stave cooler.

[0007]

According to the stave cooler of the present invention, in the stave cooler structure shown in FIGS. 2 and 3, in addition to the conventional cooling pipe arranged on the steel shell side, the vicinity of the back surface of the brick inside the furnace is provided. In addition, cooling piping is additionally arranged, and in addition, both these pipings can be switched by a switching valve.

In the early stage of the operation, a cooling pipe is also provided near the back of the brick inside the furnace, thereby increasing the cooling effect of the rib holding the brick inside the furnace, thereby maintaining the rib supporting function. This prevents the bricks from falling off. In addition, by making it possible to switch the press-fitting of the cooling water from the common header, when the bricks are worn out, the water supply is stopped, and a cachable or the like is press-fitted and closed inside.

As described above, by selectively supplying the required cooling water to the cooling pipes according to the operating conditions of the stave cooler, that is, without increasing the amount of cooling water, it is possible to effectively supply the cooling water to the required locations. Can be supplied.
Both of these pipes can be switched by a switching valve.

[0010]

FIG. 1 shows a stave cooler 10 according to an embodiment of the present invention.

FIG. 2 is a view corresponding to the longitudinal sectional view of FIG. 3 of the above-mentioned conventional example, and the same parts as in FIG. 3 are denoted by the same reference numerals. In FIG. 1, reference numeral 1 denotes a cooling pipe additionally arranged near the back of the brick row 15 inside the furnace in addition to the conventional double cooling pipe 12 arranged on the steel shell side. Although this pipe shows an example in which only one stage is arranged near the back surface of the brick row 15 inside the furnace, it can be provided in a plurality of levels in relation to the brick row 15 inside the furnace. As described above, the thickness of the stave cooler can be made thicker than the conventional case by adding the cooling pipe 1, but the thickness of the cast brick 15a may be made equal to the conventional one without mounting the cast-in brick 15b inside the furnace. .

[0012] By adding the cooling pipe of the stave cooler near the back of the brick row 15 inside the furnace, the total amount of cooling water is increased and there is a concern that the equipment cost will increase. And the cooling pipe 12b on the back side. Furthermore, by making the cooling pipe 12b on the back side switchable through the three-way valve 2, cooling is performed by the pipe 1 inside the furnace and the main cooling pipe 12a at the initial stage of burning, and the pipe inside the furnace is worn after the bricks are worn out. Stop supplying water to
Switching is performed by the three-way valve 2, and water is passed through the cooling pipe 12b on the rear surface. The pipe in which the water flow is stopped may be left as it is, but, for example, by press-fitting a castable or stamp material, the cooling effect on the inner surface of the stave furnace can be enhanced.
In addition, when the wear reaches the pipe, there is no step difference between the pipe and the stave surface, and the raw material can be stably discharged.
The life of the blast furnace can be prolonged without increasing the amount of cooling water by switching the piping for passing water between the early stage and the late stage of the operation.

Further, if there is a sufficient amount of water for cooling the stave cooler, the conventional main cooling pipe 12
a, If cooling water is supplied to all of the cooling pipes 12b on the back surface and the cooling pipes 1 added near the back surface of the brick row, the life of the blast furnace is further improved. In addition, since the cooling pipe 12b on the back surface passes for several years until water is passed, rust in the pipe is concerned. If rust is generated in the piping, there is also a problem that the cooling effect is significantly reduced. In this case, a part of the cooling water passing through the cooling pipe 1 added near the back of the brick may be distributed to the cooling pipe 12b on the back, or the cooling pipe 12b on the back may be added to the conventional amount of water.
The problem can be solved by adding the amount of water to be passed through the water. At this time, the cooling is performed simultaneously with the cooling pipe 12b on the back side and the cooling pipe 1 added near the back of the brick row, so that the cooling is performed without using the three-way valve 2 installed for switching. A valve for controlling the flow rate may be added to each of the pipe 12b and the cooling pipe 1 added near the back of the brick row.

Although the above embodiment shows an example applied to the conventional example shown in FIG. 3, the present invention is not limited to this, but is applied to the inventions described in the above-mentioned respective publications and other forms as they are. Accordingly, a combined effect with the effect of each invention can be expected.

[0015]

According to the present invention, a conventional stave cooler is
Since only additional cooling pipes are added, the cooling effect of the ribs that hold the bricks of the stave cooler is increased by a relatively simple structural change, which increases the brick holding power and prevents the falling off of the bricks, and the initial operation of the blast furnace Of the blast furnace can be reduced, and the life of the blast furnace can be extended.

[Brief description of the drawings]

FIG. 1 shows a stave cooler according to the invention in longitudinal section.

FIG. 2 shows an arrangement of a stove cooler in a blast furnace.

FIG. 3 shows the structure of a conventional stave cooler by a longitudinal section.

FIG. 4 shows a stave cooler according to the invention in cross section.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 furnace inside cooling pipe 2 switchable three-way valve 10 stave cooler according to embodiment of the present invention 11 conventional stave cooler 12 cooling pipe 12a main cooling pipe 12b back cooling pipe 13 blast furnace iron shell 14 joint 15 brick row 15a casting Brick 15b Cast-in brick 16 Header 16a Main cooling pipe header 16b Rear cooling pipe header 17 Cast iron

Claims (1)

[Claims] 1. A brick is arranged in a horizontal line inside a furnace, a plurality of bricks are arranged at intervals, and a cooling pipe for circulating a cooling medium is arranged on a steel shell side opposite to the inside of the furnace. In a stave cooler having a structure in which the brick is supported by ribs formed by casting it with cast iron, cooling pipes are additionally arranged on the back side of the brick inside the furnace, and the cooling pipe additionally arranged is provided. A stove cooler that uses the same header pipe as the header pipe of the cooling pipe arranged on the steel shell side and that can switch the circulation and inflow of the cooling medium to both of these pipes.