JPH11286708A - Method for fitting stave cooler, and structure for fitting stave cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting method of a stave cooler for preventing the lowering of cooling effect for a refractory in the stave cooler caused by generation of a gap developed in a packing layer of a stamp, and a fitting structure of the stave cooler. SOLUTION: In the fitting structure for fitting the stave cooler 1 for cooling the furnace body of a blast furnace to an iron shell 6 by shiftably fitting the stave cooler 1 toward the refractory 14 in the furnace body so as to be able to remove a gap 16 between the front surface of the stave cooler 1 and the refractory 14, a spring 7 for pushing the front surface of the stave cooler 1 so as to be siftable to the refractory 14 side in the furnace body and a protecting tube 11 for casting pipe, fixed to the stave cooler 1 are fixed to the iron shell 6 through an expandable bellows 13 of a gas seal metal 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a stave cooler used for cooling a furnace body of a blast furnace and a stave cooler.

[0002]

2. Description of the Related Art Conventionally, a stave cooler is often used as a method for cooling a furnace body of a blast furnace.

FIG. 3 is a schematic view showing a general structure of a side wall at the bottom of a blast furnace. Since the inside of the blast furnace is at a high temperature of 1300 to 1500 ° C. due to the contents 18 such as hot metal and slag, the furnace bottom side wall is protected by the refractory 14. Further, in order to prevent the refractory 14 from being eroded by the contents 18, a plurality of stave coolers 1 for cooling the refractory 14 are arranged on the furnace bottom side wall via a stamp filling layer 15. The steel shell 6 is installed on the outer shell of the blast furnace main body, forms a pressure vessel, and has a function as a self-standing structure.

Various types of stave coolers have been proposed, for example, as disclosed in JP-A-8-120313 and JP-A-8-85808.

FIG. 4 is a longitudinal sectional view showing a conventional stave cooler mounting structure, and FIG. 5 is a schematic view of a single stave cooler 1 viewed from the furnace outer surface, which is described in Japanese Patent Application Laid-Open No. Hei 8-120313. Things. A plurality of casting pipes 10 as cooling water passages are installed in the stave cooler 1 made of a cast iron base material. Further, the stave cooler 1 is attached to the steel shell 6 by a plurality of fixing bolts 3 and nuts 4 screwed thereto, and is cooled by flowing water through a casting pipe 10 arranged in the stave cooler 1.

[0006] In order to absorb the difference in thermal expansion of the refractory 14 at the time of initial construction and at the time of operation, the stave cooler 1 and the refractory 1 are used.
4, a stamp filling layer 15 having shrinkability is formed.

FIG. 6 is a longitudinal sectional view showing another conventional stave cooler mounting structure.

The stave cooler shown in FIG.
No. 85808. The stave cooler 1 is composed of a fixing bolt 3 having a square head for preventing rotation, a nut 4 and a washer 5 screwed to the fixing bolt 3.
It is completely fixed to the iron skin 6. Further, the fixed portion is gas-sealed by the gas sealing cap 17. On the other hand, the cast pipe 10 is protected by the protective tube 11 at the joint with the steel shell 6.

The protection tube 11 is installed on the outer surface of the casting pipe 10 and both are integrally cast into the stave cooler 1, so that the load is transmitted at the junction through the protection tube 11. The gas seal fitting 12 functions as a structure that seals the gas inside the furnace and joins the protective tube 11 and the steel shell 6.

[0010]

The refractory of the furnace bottom is worn away as the surface layer wears out with the progress of the operation of the blast furnace, and the wear of the refractory on the furnace bottom is the main factor that determines the life of the blast furnace. Therefore, it is an important technical subject to increase the cooling effect of the stave cooler to suppress erosion due to contents such as hot metal and slag, reduce the wear rate of refractories, and improve the life of the blast furnace.

However, in the mounting structure described in the above publication, since the stave cooler 1 is completely fixed to the steel shell 6, the thickness of the stamp filling layer 15 is reduced by the pressing force, but the pressing force is released. Even if the stamp 15 is not restored, a void layer is generated on both the inside and outside of the furnace of the stamp 15. However, the heat transfer coefficient of gas is 100% of that of solid refractories.
It is extremely low at about one-third, and the generation of the void layer has a very large adverse effect on the cooling effect of the stave cooler 1 on the refractory 14.

In the conventional system, the stave cooler 1
Is completely fixed to the steel shell 6, the stove cooler 1 cannot be moved in the furnace direction in accordance with the thermal expansion fluctuation of the refractory 14, but also the protective tube 11, the gas seal fitting 12 and the iron Since the joining of the skins 6 is entirely performed by welding, the followability to the movement in the furnace direction is not the same as that of the fixing bolt 3 described above. Therefore, the stamp filling layer 1
5 cannot be avoided.

As described above, in the conventional method, since the mounting position of the stave cooler at the beginning of construction cannot be adjusted at all in the subsequent operation process, it is not possible to avoid the void generated in the stamp filling layer 15 due to the temperature fluctuation of the contents 18. Can not. For this reason, auxiliary measures such as press-fitting paste from outside the furnace have been taken as a means of reducing the adverse effects of voids.However, along with the complexity of the work, satisfactory results have been obtained in terms of economy and cooling function. Not been.

The present invention provides a stave cooler mounting method and a stave cooler mounting structure for preventing a stave cooler from reducing a cooling effect on a refractory due to generation of a void generated in a filling layer of a stamp.

[0015]

SUMMARY OF THE INVENTION The mounting method of the present invention is a method of mounting a stave cooler for cooling a furnace body of a blast furnace. A stove cooler is movably mounted toward the refractory of the furnace body so that a gap with the object can be removed.

The mounting structure according to the present invention is a mounting structure for mounting a stave cooler for cooling a furnace body of a blast furnace to a steel shell, wherein the stove cooler has a front surface movable toward a refractory side of the furnace body and presses the stave cooler. A protection pipe for a cast pipe fixed to the steel pipe is provided so as to be movable with respect to the steel shell.

The pressing means may be a spring which presses the front surface of the stave cooler between the stave cooler and the steel shell toward the refractory side of the furnace body.

Further, a bellows which can be extended and contracted is provided on the gas seal fitting fixed to the steel shell and fixed to the protection pipe for the cast pipe.

[0019]

FIG. 1 is a longitudinal sectional view showing an attachment structure of a stave cooler according to the present invention.

The stave cooler 1 is attached to a steel shell 6 by a fixing bolt 3 which can move through the through hole 2 of the stave cooler, a nut 4 and a washer 5 screwed to the fixing bolt 3.

Between the stave cooler 1 and the steel shell 6,
The spring 7 is provided. The spring 7 has a biasing force for pressing the front surface of the stave cooler 1 against the refractory 14 in the furnace. Therefore, if the nut 4 is loosened to increase the distance between the stave cooler 1 and the steel 6,
Following this, the spring 7 is connected to the stave cooler 1
Is pressed against the refractory 14 side in the furnace.

The outside of the fixing bolt 3 of the stave cooler 1 is covered with a gas seal fitting 9 to which a removable cover 8 is fixed in order to seal gas from inside the furnace.

The inlet and outlet of a casting pipe 10 cast into the stave cooler 1 for flowing cooling water is protected by a protective tube 11 fixed to the stave cooler 1, and further, in order to seal gas from inside the furnace, It is covered with a gas seal fitting 12. A part of the gas seal fitting 12 is configured so that the gas seal fitting 12 can expand and contract. For example, a bellows 13 is provided so that the cast pipe 10 and the protection pipe 11 can follow the horizontal movement of the stave cooler 1. To do.

Next, the operation of the stave cooler 1 of the present invention will be described.

FIG. 2 is a longitudinal sectional view showing a state in which the stave cooler of the present invention is moved. When a gap 16 is formed in the stamp filling layer 15 as shown in FIG.
When the nut 4 is loosened, the stave cooler 1 is moved in the furnace direction until a required pressing force is generated by the reaction force of the spring 7. It is possible to make adjustments to eliminate this. As a result, the void generated in the stamp filling layer 15 is released.

In this embodiment, the stove cooler 1 is moved inside the furnace by using the reaction force of the spring 7, but the stave cooler 1 can be moved by a jack or the like instead of a spring. Therefore, the invention is not limited to the spring method.

[0027]

According to the present invention, the stove cooler can be moved to the refractory side of the furnace body, so that the stave cooler can be moved and adjusted not only during the construction of the blast furnace but also after the start of operation. Thereby, the voids of the stamp filling layer caused by the temperature change of the contents such as hot metal and slag can be removed as necessary. By removing the voids, the cooling effect on the refractory by the stave cooler can be improved, so that the refractory wear rate can be kept low, and as a result, the life of the blast furnace can be extended.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mounting structure of a stave cooler of the present invention before adjustment.

FIG. 2 is a longitudinal sectional view showing a state (after adjustment) in which a stave cooler of the present invention is moved.

FIG. 3 is a schematic view showing a general structure of a side wall of a blast furnace bottom.

FIG. 4 is a longitudinal sectional view showing an example of a conventional stove cooler mounting structure.

FIG. 5 is a schematic view of a single stave cooler viewed from the furnace outer surface.

FIG. 6 is a longitudinal sectional view showing another conventional stove cooler mounting structure.

[Explanation of symbols]

 1: stove cooler 2: through hole 3: fixing bolt 4: nut 5: washer 6: iron shell 7: spring 8: cover 9: gas seal metal 10: cast pipe 11: protective tube 12: gas seal metal 13: Bellows 14: Refractory 15: Stamp filling layer 16: Void 17: Cap for gas seal 18: Contents

Claims (4)

[Claims] 1. A method of mounting a stave cooler for cooling a furnace body of a blast furnace, the method including removing a gap between a front surface of the stave cooler and a refractory caused by a difference in a thermal expansion amount of a refractory of the furnace body. A blast furnace stove cooler, wherein the stove cooler is movably mounted toward the refractory of the furnace body. 2. A mounting structure for attaching a stave cooler for cooling a furnace body of a blast furnace to a steel shell, means for pressing a stave cooler front surface so as to be movable toward a refractory side of the furnace body, and a caster fixed to the stave cooler. A stove cooler mounting structure for a blast furnace, wherein a protection pipe for a buried pipe is provided movably with respect to a steel shell. 3. The stave of a blast furnace according to claim 2, wherein the pressing means is a spring provided between the stave cooler and the steel shell, for pressing a front surface of the stave cooler toward the refractory side of the furnace body. Cooler mounting structure. 4. A stove cooler mounting structure for a blast furnace according to claim 2, wherein a bellows which is fixed to the steel shell and is expandable and contractable is provided on the gas seal fitting fixed to the casting pipe protection tube. .