JPS5925006B2 - Converter construction method using trapezoidal bricks - Google Patents

Description

[Detailed description of the invention] The present invention relates to bricklaying for converters.

The structure of the converter is such that the lower and upper parts of the furnace body are conical, with the aim of increasing the agitation of molten steel during refining and preventing molten steel etc. from scattering outside the furnace due to slopping. doing.

Traditionally, horizontal stacking of bricks has been used to construct the conical part of the converter, but with this method, the bricks are arranged in a step-like manner in the conical part of the converter, resulting in the overhang 3 shown in Figure 1, which occurs during the operation of the converter. In this case, spalling occurred, which had a major impact on the life of the converter.

As a method to make this hanging 3 as small as possible and to greatly reduce spalling, the bricks are placed diagonally in the upper part of the converter body so as to make an angle α with the horizontal direction according to the angle of the shell, as shown in Figure 2. Recently, the construction method has been widely used.

The bricks built diagonally in this way have rectangular and square cross sections, as shown in Figure 3 A and C, and the longitudinal cross sections a and b have different dimensions, and the inner and outer circumferences are determined by the thickness of the furnace wall after construction. It is common to use vertical jelly bricks that absorb the difference in

If bricks having such a shape are constructed in a conical converter, a wedge-shaped gap f will be created as shown in FIG.

That is, if the contact points of the vertical jelly bricks 2 with the steel shell 1 shown in Fig. 4A are A and B, then since the furnace body is conical, the horizontal circumference length l of point B and the horizontal direction of point A The circumference length l is
>1' holds true, and if you arrange bricks with thickness t, width a on the skin contact side, and width on the furnace center side as shown in Figure 3 on the surface surrounded by A, B, and 1, the bricks will be Upper side (point B)
A gap of 1-1' is generated around the circumference.

In actual construction, if the bricks are constructed in the form shown in Figure 4 and the upper side (point B) and the lower side (point A) of the bricks have the same width a, then the upper side (point B) will have f, A void shown by f is generated.

Such a construction method that creates void joints must be avoided because hot metal, molten steel, and slag will enter the void joints in the lower part of the converter body, which corresponds to the steel bath, and will accelerate the melting of the bricks.

The present invention has been made in view of this situation, and it is possible to solve the above-mentioned drawbacks by using bricks with different widths in the thickness direction so as not to form wedge-shaped gap joints in the conical part of the converter. This is what I did.

The present invention will be explained in detail below with reference to FIG.

As shown in FIGS. 5A and 5C, the bricks used in the method of the present invention have a constant thickness 7, and a width a on the iron skin side and a width d on the C1 furnace center side in the thickness direction of the bricks, respectively, of different sizes.

In the longitudinal direction, the shape is tapered toward the furnace center side with respect to the iron skin side, similar to conventionally used bricks.

Using such trapezoidal bricks, the length of the furnace circumference at point A is 1' even if the cross section of the brick is placed parallel to the steel shell 1 in Figure 5A.
The difference in the furnace circumference length l between points B and B is the difference in the brick thickness direction (a
-c), and can be constructed without creating any voids, as shown in the plan view at the opening in Figure 5.

The same applies not only to the shell side of the furnace but also to the center side of the furnace.

By using bricks having a trapezoidal cross section in this way, even if the bricks are constructed at an angle of inclination α to the horizontal of the steel shell 1, it is possible to minimize the gap joints or eliminate them altogether.

The trapezoidal cross section refers to a quadrilateral with a pair of parallel sides, as shown in FIG. 6, and is a to C.

As described above, the present invention uses trapezoidal bricks at a certain angle to the horizontal that matches the shell of a converter having a conical furnace shell, and stacks the bricks at an angle so as to prevent the formation of void joints. This has the remarkable effect of significantly extending the lifespan of bricks since they are effectively used without the formation of stepped bricks.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of horizontally stacked bricks, Figure 2 is an explanatory diagram of diagonally stacked bricks, Figure 3 is a diagram of A 2 and C is a diagram of vertically stacked bricks,
Figure 4 A 2, C is a diagram showing the conventional construction method, Figure 5 A 2
B, C are diagrams showing the construction method of the present invention, and FIG. 6 is a sectional view of a trapezoidal brick. 1... Furnace body shell, 2... Vertical seri brick, 3... Hanging.

Claims (1)

[Claims] 1. In the construction of a converter refractory, a trapezoidal brick cross section with different widths in the thickness direction is constructed in the conical part of the converter with an angle α between the longitudinal direction of the brick and the horizontal. Furnace construction method.