JPS60169082A - Method of constructing furnace wall - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing furnace walls for blast furnaces, etc., and particularly proposes a method for constructing furnace walls that prevents refractories from falling into the furnace. It is.

[Prior art]

Blast furnace walls have traditionally been made of standard refractories such as clay bricks and high alumina bricks, which are molded into a predetermined shape depending on the shape of the shell of each part of the blast furnace, such as the chest, belly, morning glory, etc. It was constructed by laminating the refractories in the circumferential, vertical, and radial directions, filling joints between the contact surfaces of each type of refractory, and joining them together.

By the way, tough standard refractories are subject to wear and tear due to thermal, mechanical, and chemical factors. In particular, the regular refractories located at the innermost part of the furnace chest 1 are exposed to a hot atmosphere with rapid temperature fluctuations and undergo repeated expansion and contraction, resulting in cracks parallel to the heating surface. While this crack is small, there is no risk that 111~ will fall into the furnace from the restraint part due to the pushing force and kicking effect received from the surrounding regular refractories, but as this crack progresses and the surrounding regular refractories If a series of large cracks occur, the -1 effect cannot be expected and the fragments will fall into the furnace.
It comes to that. Furthermore, if something attached to the stairwell or furnace wall falls off, the surface of the regular refractory undergoes a rapid temperature change, causing thermal spalling cracks. When this thermal spalling crack spreads to the adjacent regular refractories, it becomes a large crack.
Therefore, in this case as well, a kicking effect cannot be expected and large pieces fall into the furnace.

In addition, the 1li4 joint material is either a paste made by adding liquid to a mixture of powdered refractories and a binder, or it is made in the low temperature range (400°C or higher) where binder adhesive strength is developed. ) and the high temperature range where sintering begins (
At Hloooo (1 or higher), sufficient adhesive strength can be maintained, but in the intermediate temperature range of 400°C to 1000°C, sufficient adhesive strength cannot be maintained, resulting in loosening of the joints. There are cases where regular refractories fall into the furnace.

This will cause hollow spots on the iron shell, which will impede the stable operation of the blast furnace, so it is extremely important to prevent the refractory from falling.

〔the purpose〕

The present invention was made in view of the above circumstances, and consists of stacking furnace wall construction members consisting of refractories of a predetermined shape and frames made of heat-resistant metal surrounding the refractories, and mechanically connecting adjacent frame members. It is an object of the present invention to provide a furnace wall construction method that can prevent cracks from occurring in surrounding refractories and prevent the refractories from falling into the furnace.

[Structure of the invention]

The method for constructing a furnace wall according to the present invention involves piling up furnace wall construction members having a refractory of a predetermined shape and a heat-resistant metal frame surrounding the refractories, and mechanically connecting adjacent frame materials to create a furnace. Characterized by building walls.

〔Example〕

The present invention will be described in detail below with reference to drawings showing embodiments thereof. FIG. 1 is a perspective view showing a heat-resistant metal frame material used in carrying out the furnace wall construction method according to the present invention and a regular refractory material loaded therein.

The frame material 1 made of a heat-resistant material such as S U' 304 is long and
It is formed into a square tube shape with both end faces facing the I horn open.
The longitudinal axes of the blast furnaces are shown in Fig. 2, which will be described later. The width direction/J method of the − side in the long f direction (hereinafter referred to as the inner surface side) located on the center side of the C furnace 6 of the frame + AI is higher than the width direction ” method on the other side in the longitudinal direction (hereinafter referred to as the outer surface side). It has a slightly narrow width, and the inner and outer end surfaces are curved according to the curvature of each part of the blast furnace 6. Inner and outer surfaces f11 of the upper edges of the width direction and side surfaces of the frame material 1 A horizontally elongated fitting convex portion 3.3 is provided at a position near the II end. The width of the fitting convex portions 3, 3 is the width of the fitting convex portions 3, 3 on the other side of the frame material 1 in the width direction at a portion corresponding to the fitting convex portions 3°3.

An 11χ matching hole 2°2 having a size substantially equal to the thickness dimension is formed.

Such a frame + AI shape, size and fitting hole 2゜211
The shape and size of the fitting protrusions 3, 3 are determined in the same way for each part of the blast furnace 6.
．． 3 is inserted into the fitting hole 2.2 of another frame member 1, and the two are connected by fitting and fixing this part.

A regular refractory material 5 made of chamotte bricks or the like having an external dimension slightly smaller than the internal dimensions of the frame material 1 is inserted into the frame material 1, and both It is fixed by cask full refractory material 4 etc. coated in a thin film on the inner surface, thereby forming the furnace wall construction member 12. Grooves 5a, 5a having a predetermined depth of 14 are formed at positions corresponding to the fitting holes 2, 2 of the regular refractory 5, to prevent insertion of the protrusion 3 into the fitting holes 2, \. This is to ensure that there are no problems.

Next, a process of constructing the furnace wall of a blast furnace using the furnace wall construction member 12 consisting of the frame material 1 and the shaped refractory 5 will be explained. FIG. 2 is a schematic vertical sectional view of the blast furnace, and FIG. 3 is a partially enlarged perspective view of the furnace wall. The hearth plate 8 is circular in plan view. Construction part 4
A12 is connected annularly in the circumferential direction of the blast furnace 60 as described above, and a plurality of layers (third
In the figure, there are three layers (ζ). By performing this arrangement over the entire height of the blast furnace 6, the furnace wall of the II furnace 6 is constructed. The mode of installation is the third
As shown in the figure, the inner layer 9. Middle layer 10. The outer layers 11 are arranged in a staggered manner. Also, middle class 10. In the outer layer 11, the inner layer 9 culms are not affected by the temperature inside the furnace, so this portion may have the same furnace wall structure as the conventional one.

Frame 4AI by each furnace wall construction part arranged in this way (if there is a gap between the upper and lower surfaces of the old 2, or between the radial direction and the joint surface in the same direction, the temperature of each part of the blast furnace 6 will change).

Taking into consideration the expansion and contraction of the regular refractory material 5, it is filled with a suitable castable castable material, and the construction member I
No rattling will occur in 2. Also, similarly, backlash prevention I
8. Between the outer layer 11 and the iron skin 7 because of V. 1. Fill with castable fireworks 34 of appropriate thickness. ν・Sufu 7+ as required
At this point, the steel skin 7 and the cask pull refractories 34 are firmly attached to each other, so that the steel skin 7 and the cask pull refractory 34 are firmly attached to each other.

In the case of the embodiments described above, each standard refractory 5.5.
- is loaded in the frame material 1, so even if a crack occurs in the regular refractory 5 due to expansion and contraction due to severe thermal fluctuations in each part of the blast furnace, the crack will not spread to the adjacent regular refractory 5. There are no consecutive cracks in each standard refractory 5°5.... Therefore, each frame material 1. I.
...It is expected that the debris will not fall because it is inside. In addition, since this method mechanically connects each frame material], l..., and does not connect standard refractories with refractories as in the past, the effects of fluctuations in adhesive strength due to temperature changes can be avoided. Stable connection is possible with less damage. In addition, the frame material (1) has good orderliness and the degree of looseness is small, making it possible to improve workability.

FIG. 4 is a perspective view showing another embodiment of the present invention. In this embodiment, each of the frame members 1, 1... is connected by a single connection. ,. That is, as shown in FIG. 4, the furnace wall construction part +422.22 consists of a frame +A21 that is substantially similar to the frame material 1 described above and a regular refractory 5 loaded therein.
The side surfaces in the width direction of the furnace wall construction members 22 are brought into contact with each other, and a connecting plate 23 of approximately the same length and length as the longitudinal direction of the furnace wall construction member 22 is placed in position 2, and a welding machine (not shown) is used. Then spot weld the two to connect them.

Then, by sequentially performing such a connection mode in the circumferential direction of the blast furnace 6, the blast furnace wall is constructed.

This embodiment also provides the same effect as the embodiment shown in FIG.

The mechanical connection of each frame member 1.1 is not limited to the method described in 1.2, but may also be done by bolting, caulking, etc. The connection is not limited to the circumferential direction as in the 1) J-embodiment, but may also be connected in the ÷14 radial direction or in the 1-upward direction.

In addition, in the embodiment described above, the entire furnace wall was constructed from furnace wall construction members, but there is a large risk of the refractory falling off due to severe temperature fluctuations, such as in the hearth chest. It is also possible to construct the partition with the horizontal wall part 41 of the furnace wall.

Alternatively, the furnace wall construction member may be formed 1' by filling the frame with an undefined refractory such as a castable refractory and solidifying it.

[Effect J Next, the 9) effect of the present invention was pasted on the example, and it was clearly misplaced. Figure 5 shows a comparison of the protection status of the part constructed by the method of the present invention and the part constructed by the conventional method when a panel spalling test was conducted with restraining force applied from the left and right directions. FIG.

The test was conducted by heating and cooling the surface of the construction part, and changing the surface temperature of the refractory by 6 amounts in 30 minutes between 400°C and 1000'C (1). Although cracks have occurred in the refractory 5 in the construction part 31 constructed by the method of the present invention, the furnace wall construction part (former 2 itself has fallen off due to the -l effect).
・While there is no U7, the construction part 31 is -1, located below.
Construction using the conventional method q++32.33b caused a large crack as shown in the figure, and refractories fell in the direction of the white arrow.

As detailed above, the method for constructing a furnace wall according to the present invention involves stacking a refractory of a predetermined shape and a frame material made of heat-resistant metal surrounding the refractory, and placing the adjacent L. Since the furnace wall is constructed by mechanically connecting the casings, cracks will not spread to the surrounding regular refractories, and cracks in each regular refractory will not be continuous, making it easier to construct the furnace wall. A slice of the department itself 9
The present invention has the following advantages: JJ results are expected to be high, refractories do not fall into the furnace, and therefore stable blast furnace operation can be performed, and workability can be improved due to the orderliness of the furnace wall construction members. It has excellent effects.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a perspective view showing a frame material used in carrying out the method of the present invention and a regular refractory loaded therein, and FIG. 2 is a schematic cross-sectional view of a blast furnace. Figure, 3rd
4 is a perspective view showing another embodiment of the present invention, and FIG. 5 is a perspective view for explaining the effect of the method of the present invention. 1.21...Frame material 5...Standard refractory material 12.22
... Sui Wall Construction Department + 4 Patent Issued 1 person Resident Metal Industry Co., Ltd. Patent Attorney Noboru Kono Figure 2 Figure 3 Figure 5 UA

Claims (1)

[Claims] 1. A furnace characterized in that a furnace wall is constructed by stacking furnace wall construction members having a refractory of a predetermined shape and a heat-resistant metal frame surrounding the refractory, and mechanically connecting adjacent frame members. Wall construction method.