JPH046762B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for constructing a blast furnace shaft with bricks, and in particular, the engagement of a stave and a furnace wall refractory installed for the purpose of cooling the blast furnace wall. The present invention relates to a method for constructing a blast furnace shaft using bricks, which prevents falling of refractories from the furnace wall.

(Prior Art) As shown in the vertical cross-sectional view of the blast furnace in FIG.
The ore receiving portion 5 is connected to the ore receiving portion 5. As shown in the partial vertical cross-sectional view of the shaft portion in FIG. As shown in the vertical cross-sectional view of a portion of the shaft portion, the stave 6 and the steel skin 8 are fixed with bolts and filled with putty 9, making them integral.

As shown in FIGS. 6 and 7, if there is no support between the stave 6 and the bricks 7, the bricks 7 will fall off during blast furnace operation, which will shorten the life of the furnace.
On the other hand, if the bricks 7 are wound thickly in order to extend their lifespan, the cost will increase. As a method to solve these problems, a composite cooler in which a heat insulating layer is interposed between the stave 6 and the engaging surface of the refractory was proposed in Japanese Patent Laid-Open No. 57-131981.
Disclosed in the issue. In this method, there is a large temperature difference between the working surface of the refractory in the furnace and the refractory that comes into contact with the stave 6, which is a metal block, and this temperature difference causes thermal stress to act within the refractory. Since cracks are generated due to stress, this method involves interposing a heat insulating layer to avoid this. As shown in FIG. 8, the composite cooler includes a stave 6 and a refractory block 1 which are integrally engaged at the joint surface 3.
1. Consisting of a cooling pipe body 10 installed inside the stave 6 and a heat insulating layer 12, the refractory block 11 and the stave 6 are engaged with a wedge-shaped uneven surface, with a heat insulating layer 12 interposed on the engagement surface. I'm letting you do it. Further, as shown in FIG. 9, the composite cooler uses studs 14 made of metal or refractory material, and engages the stave 6 and the refractory block 11 with a heat insulating layer 12 interposed between the engagement surfaces.

(Problems to be Solved by the Invention) The composite cooler disclosed in JP-A-57-131981 has a heat insulating layer provided on the refractory, the refractory and the cooling pipe body are arranged in a casting mold, Although molten metal is cast into one piece, the stave and refractory block are engaged at a wedge-shaped portion, which can easily cause cracks at the corners, and there is a risk that the refractory block may fall off during use. It was hot. Furthermore, as shown in FIG. 8, since the large refractory block 11 is integrally engaged at the engaging surface 13, cracks occur due to thermal stress. However, although this cracking can be reduced by subdividing the refractory block 11 into bricks, this method has the problem of hindrance to engagement.

(Means for Solving the Problems) The purpose of the present invention is to provide a method for constructing a blast furnace shaft with bricks, which can eliminate and improve the unresolved problems of the prior art. The above object can be achieved by providing the method described in the claims.

That is, in a method of constructing a brick furnace wall of a blast furnace shaft, in which a furnace wall refractory is applied to the inner surface of the stave inside the furnace, which is installed as a means for cooling the furnace wall of the blast furnace shaft: A plurality of grooves filled with refractories and initial cavity grooves are alternately provided at predetermined intervals along the inner surface of the furnace inside the protruding stave, and a brick is placed on the upper part starting from the lower end of the stave that protrudes into the inside of the furnace. Each set of the laminated bricks is combined using a dowel joint structure to form an integral set, and a support brick is placed at a position corresponding to the initial cavity groove inside the furnace, and this brick is pre-filled with the The dowel groove of the support brick, in which the dowel groove is further provided in the dowel joint structure, and the dowel groove previously provided in the stave cavity groove are engaged by a support fitting with dowels provided at both ends, and after the engagement A method for building a blast furnace shaft with bricks that prevents the refractory from falling off the furnace wall, characterized by filling a cavity groove with refractories, then stacking bricks using a dowel joint structure, and stacking the bricks on the inner surface of the furnace inside of the stave. It is related to.

Next, the present invention will be explained in detail.

FIG. 1a shows a cross section of a brick support part of a blast furnace shaft according to the present invention, and FIG. 1b shows a surface of the brick area. As shown in FIG.
It has a structure in which the stave 6 including 0 is integrated with a support fitting 15. The bricks used are regular-shaped bricks divided into multiple parts.
As shown in the figure, dowels 1 are attached to a plurality of regular bricks 17.
8 and dowel grooves 19 are provided, and a plurality of regular bricks 17 are engaged with each other by the dowels 18 and dowel grooves 19, thereby forming an integrally engaged inner wall refractory. Furthermore, a recess 20 is provided in a part of the regular brick 17, and the recess 20 is located closer to the stave 6 than the dowel groove 19, and the recess 20 is shaped so that when the support fitting 15 is fitted, the upper surface of the brick 16 is flattened. The supporting bricks 16 are arranged at predetermined intervals, and the dowels 22 at the ends of the supporting metal fittings 15 are engaged with the dowel grooves 21 provided in the stave 6. As shown in FIG. 1a, the lower end 23 of each stave 6 has an L-shaped cross section with the lower end protruding into the furnace so that a regular brick 17 can be placed thereon, and the side surface of the stave 6 that engages with the regular brick 17 has an L-shaped cross section. A plurality of grooves 25 filled with refractories 24 and initial cavity grooves 27 having dowels 21 for engaging the support bricks 16 with the stave 6 by the support fittings 15 are alternately provided at predetermined intervals. . After the supporting bricks 16 are connected to the staves 6 by the supporting metal fittings 15, the grooves 27 are filled with a monolithic refractory 26.

FIG. 3 is a perspective view showing the arrangement of the supporting metal fittings 15. They are arranged at intervals of approximately 500 mm, and are provided in four stages in FIG. You can increase the number.

The lower end of the stave 6 has a structure that is simply an extension of the lower end of the stave, or a structure that has cooling piping built into the extension and a cooling function added by flowing a cooling medium, and the upper surface that is the mounting surface for the bricks at the lower end. Alternatively, dowel grooves may be machined to form a pair with the dowels of the bricks to be piled up.

By extending the lower end of the stave and also serving as a brick support, it becomes possible to lay bricks in advance for each stave instead of constructing on site as in the past.

Next, the present invention will be explained with reference to examples.

(Example) FIG. 4 is a perspective view of a brick support part of a blast furnace shaft part. A plurality of grooves 25 filled with refractory material 24 and a plurality of initial cavity grooves 27 are provided on the side surface of the stave 6. First, the cross section L of the stave 6 protruding into the furnace
A regular shaped brick 17 is stacked on the lower end 23 of the letter shape. In this case, a dowel groove is provided on the lower end 23 of the stave 6 so that the dowel 18 on the lower surface of the regular brick 17 is engaged, and the dowel grooves can be engaged with each other in a dowel joint structure and brought into close contact. Using the dowel grooves 19 provided on the upper surface of the regular brick 17 as a guide, the upper stage of the regular brick 17 is engaged with the dowel 18 provided on the lower surface of the regular brick 17 to be integrally assembled. Then, a support brick 1 is placed at a position corresponding to the initial cavity groove 27 inside the stave furnace.
6 has a dowel 2 at the end of the support fitting 15 in a recess 20 provided on the stave 6 side outside the dowel groove 19 on the upper surface.
2 are fitted and engaged, and the dowel 22 at the other end of the support fitting 15 is fitted and engaged with the dowel groove 21 provided in the initial cavity groove of the stave 6, and then is filled with monolithic refractories 26, and then shaped bricks 17 are piled up to complete the bricklaying on the inner surface of the furnace inside of the stave 6.

The blast furnace shaft brick support according to the present invention comprises:
Since the bricks forming the inner wall of the furnace are integrally assembled with each other via the dowels 18 and dowel grooves 19, it can be constructed as an integral refractory block. Since this refractory block is made by stacking a large number of bricks, the occurrence of thermal stress can be reduced compared to a large monolithic refractory block, and an inner wall of the furnace can be constructed that can suppress cracks and damage.

Furthermore, since the main part of the refractory block is connected to the stave 6 by a plurality of support fittings 15, the refractory block can be folded into the furnace only by the support fittings 15.
5, and the merging action with the integral refractory block structure results in a non-sloughing inner wall.

Next, the furnace inner side grooves 25 and 27 of the stave 6 are filled with refractories 24 and 26 as described above, and the stave 6 is formed by casting the cooling pipe body 10, and the cooling pipe body contains cooling water. is circulated for cooling. On the other hand, the bricks are in contact with the high temperature area in the furnace, and the temperature difference between the two is the cause of thermal stress. Therefore, the side grooves 25 are filled with refractories 24, and the side grooves 27 are filled with monolithic refractories 26 after the support fittings 15 are attached, and due to the presence of these refractories, the contact point between the stave inner wall side and the brick is This is effective in reducing the thermal stress applied to the brick side.

In this method of constructing a blast furnace shaft using bricks, instead of installing bricks after attaching the stave to the shell as in the past, bricks can be attached to the side of the stave in advance, assembled as a single piece, and then attached to the shell.

(Effect of the invention) According to the present invention, there are the following effects.

(1) By using supporting metal fittings and bricks with dowels, bricks will not fall off and the life of the furnace will be extended.

(2) Compared to conventional furnace walls, bricks can be wrapped thinner, reducing the cost of refractories.

(3) It becomes possible to lay bricks for each stave in advance, eliminating the need to lay bricks on site and shortening the construction period.

(4) Brickwork will be constructed on the ground, eliminating the need for work at heights.

(5) Compared to the past, temporary brickwork is no longer required.

[Brief explanation of drawings]

Fig. 1a is a cross-sectional view of the brick support part of the blast furnace shaft, Fig. 1b is a view showing the brick area surface, Fig. 2 is a longitudinal sectional view showing the engagement between the brick and the support fitting, and Fig. 3
Figure 4 is a perspective view showing the arrangement of the support fittings, Figure 4 is a perspective view of the brick support part of the blast furnace shaft, Figure 5 is a vertical sectional view of the blast furnace, Figure 6 is a partial vertical sectional view of the blast furnace shaft, and Figure 7 is a perspective view of the brick support part of the blast furnace shaft. 8 and 9 are longitudinal sectional views of the brickwork of the blast furnace shaft, respectively, of a conventional technique in which a heat insulating layer is interposed on the engaging surfaces of the stave and the refractory block with wedge-shaped uneven surfaces. . 1... Hearth bottom, 2... Hot water reservoir part, 3... Morning glory part, 4... Shaft part, 5... Ore receiving part, 6...
Stave, 7...Brick, 8...Iron shell, 9...Putty, 10...Cooling pipe body, 11...Refractory block, 12...Insulating layer, 13...Joint surface, 14...
Stud, 15...Supporting metal fittings, 16...Supporting brick, 17...Standard brick, 18...Brick dowel,
19...Brick dowel groove, 20...Brick recess, 2
1... Stave dowel groove, 22... Support metal dowel,
23... lower end of stave, 24... refractory, 25...
...Stave side groove, 26...Unshaped refractory, 27
...Stave side groove.

Claims (1)

[Scope of Claims] 1. In a method for constructing a brick furnace for a blast furnace shaft portion, in which a furnace wall refractory is provided on the inner surface of the furnace wall of a stave installed as a cooling means for the furnace wall of the blast furnace shaft portion: a stave having an L-shaped cross section; A plurality of grooves filled with refractories and initial cavity grooves are alternately provided at predetermined intervals along the inner surface of the furnace inside the stave whose lower end protrudes into the inside of the furnace, while starting from the lower end of the stave that projects inside the furnace. , Bricks are stacked on top of the stacked bricks, and each set of stacked bricks is combined into an integral set using a dowel joint structure, and a supporting brick is placed at a position corresponding to the initial cavity groove inside the furnace. A dowel groove of the support brick, in which a dowel groove is further provided in advance in the dowel joint structure in the brick, and a dowel groove previously provided in the stave cavity groove are engaged by a support fitting having dowels provided at both ends. A blast furnace shaft that prevents falling off of furnace wall refractories, characterized in that after engagement, the cavity groove is filled with refractories, and then bricks are stacked by a dowel joint structure, and the bricks are stacked on the inner surface of the furnace inside of the stave. Brick furnace construction method.