JP5076915B2 - Lining structure of the converter throttle section - Google Patents

Description

  The present invention relates to a lining structure in a converter throttle section.

  As shown in FIG. 3, in the converter 4 having the furnace bottom portion 1, the straight body portion 2, and the throttle portion 3, the brick stacking structure of the throttle portion 3 is a permanent brick on the inner surface of the iron skin 11 as shown in FIG. 4. 12 is generally constructed, and the wear brick 13 is generally constructed on the inner surface of the permanent brick 12. In addition, 5 in FIG. 3 shows a bottom part of an exchange furnace, and 6 shows a steel outlet.

  However, in the case of such a structure, if the iron skin 11 is deformed, it becomes difficult to construct the permanent brick 12 and the wear brick 13. Even if brickwork is completed, as shown in FIG. 5, unevenness occurs on the operating surface (furnace inside) of the wear brick 13. In such a construction state, wear bricks frequently fall off after a short period of use.

  For this reason, water cooling or the like has been implemented as a countermeasure against the deformation of the iron skin of the converter throttle part, but the actual situation is that the deformation of the iron skin has not been completely prevented.

Therefore, a structure in which an irregular refractory is poured between permanent bricks and wear bricks (for example, Patent Document 1) and a structure in which an irregular refractory 14 is poured instead of permanent bricks are proposed as shown in FIG. (For example, Patent Documents 2 and 3).
JP-A-1-309915 Japanese Utility Model Publication No. 5-37950 Japanese Utility Model Publication No. 5-45057

  In the structures proposed in these Patent Documents 1 to 3, even when the iron skin 11 is deformed, by adjusting the thickness of the amorphous refractory 14 to be poured, for example, as shown in FIG. The surface can be constructed without unevenness. In addition, 15 in FIG.6 and FIG.7 is a stud provided in the iron skin 11 or the wear brick 13 for fixation of the irregular refractory 14.

  However, even in the structures proposed in Patent Documents 1 to 3, cracks C are generated in the wear brick 13 as shown in FIG. 8 due to the expansion and contraction of the wear brick due to repeated heating and cooling of the operating surface in the converter operation. May fall off.

  The cause of the crack generation of the ware brick in these patent documents 1-3 is considered as follows. The wear brick is integrated with the poured amorphous refractory, and the wear brick and the irregular refractory expand and contract by repeated heating and cooling in the furnace. However, when the amount of expansion is different, a stress is generated inside, and the generated brick exceeds the allowable value of the brick, so that the wear brick is cracked.

  The problem to be solved by the present invention is that the conventional lining structure of the converter constriction cannot effectively prevent the wear brick from falling off due to a crack.

The lining structure of the converter throttle part of the present invention is
To effectively prevent wear bricks from falling off,
In the lining structure of the constricted part of the converter, where an irregular shaped refractory is poured between the iron skin of the converter and the wear brick,
The main feature is that a gap of, for example, 0.1 mm or more and 10 mm or less is provided between the wear brick and the irregular refractory.

  In the present invention, when a stud is also attached to the wear brick, it goes without saying that a gap similar to the above is also provided between the stud and the irregular refractory.

  The present invention provides a gap between the wear brick and the indeterminate refractory in the lining structure of the converter squeezed portion where the irregular shape refractory is poured between the iron skin of the converter and the wear brick. Expansion and contraction of the wear brick due to the thermal cycle can be completely absorbed by the gap. Therefore, cracks due to the difference in expansion between the wear brick and the irregular refractory are eliminated. As a result, wear brick shedding is reduced.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIG. 1 and FIG.
FIG. 1 is a cross-sectional view of a main part for explaining a first example of a lining structure of a converter throttle part according to the present invention, and FIG. 2 is a view similar to FIG. 1 for explaining a second example.

  FIG. 1 is a longitudinal sectional view of a narrowed portion 3 having a lining structure according to the present invention. A gap 16 of, for example, 3 mm is provided between the wear brick 13 and the irregular refractory 14, and the irregular refractory 14 and the wear brick 13 are provided. Are separated.

  In the present invention having such a structure, the operation surface of the wear brick 13 is repeatedly heated and cooled by the converter operation, and even if the wear brick 13 expands and contracts in the furnace height direction, the presence of the gap 16 Can expand and contract freely.

  Accordingly, the gap 16 needs to be able to absorb the expansion / contraction allowance of the wear brick 13 in the furnace height direction by repeating heating and cooling of the working surface, and the range of 0.1 mm or more and 10 mm or less. Is desirable.

  If the gap 16 exceeds 10 mm, the wear brick 13 may be loosened. On the other hand, if the gap 16 is less than 0.1 mm, the wear brick 13 and the irregular refractory 14 may interfere with each other and may not be able to completely absorb expansion / contraction in the furnace height direction.

  When the stud 15 is attached only to the iron skin 11 as shown in FIG. 1, the means for forming the gap 16 is arranged after a partition plate such as cardboard or polystyrene foam is disposed on the iron skin 11 side of the wear brick 13. What is necessary is just to pour in and form the irregular refractory 14.

  When such a construction is performed, when the converter 4 is in operation, the partition plate is burnt down by heat or the volume is reduced even if it is not burned down, and the gap 16 is formed between the wear brick 13 and the amorphous refractory 14. Is formed.

  On the other hand, when the stud 15 is also attached to the wear brick 13 as shown in FIG. 2, the stud 15 of the wear brick 13 is affixed with a plastic tape or a kraft tape, or after a thick coating of paint, The refractory 14 may be poured and installed.

  When such a construction is performed, when the converter 4 is operated, the partition plate, vinyl tape, craft tape, and paint are burned by heat or the volume is reduced without being burned, and the wear brick 13 and the stud 15 A gap 16 is formed between the refractory 14 and the amorphous refractory.

  The present invention is not limited to the above example, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, the means for providing the gap 16 between the wear brick 13 and the indeterminate refractory 14 when the stud 15 is attached only to the iron skin 11 is not limited to the one in which the partition plate is disposed, and even a thick paint is applied. good.

It is principal part sectional drawing explaining the 1st example of the lining structure of the converter throttle part of this invention. It is principal part sectional drawing explaining the 2nd example of the lining structure of the converter throttle part of this invention. It is a schematic longitudinal cross-sectional view of the converter which is an application object of this invention. It is sectional drawing explaining the conventional brick masonry structure of a converter throttle part. It is sectional drawing explaining the brick masonry structure when an iron skin changes in FIG. It is sectional drawing explaining the brick masonry structure of the converter throttle part proposed by patent document 2,3. It is sectional drawing explaining the brick masonry structure when an iron skin deform | transforms in FIG. It is a figure explaining the problem of the brick masonry structure of the converter throttle part proposed by the patent document.

Explanation of symbols

3 Constriction part 4 Converter 11 Iron skin 13 Wear brick 14 Amorphous refractory 16 Gap

Claims (2)

In the lining structure of the constricted part of the converter, where an irregular shaped refractory is poured between the iron skin of the converter and the wear brick,
A lining structure for a converter constriction section, wherein a gap is provided between the wear brick and the irregular refractory.   The lining structure for a converter constriction part according to claim 1, wherein a gap between the wear brick and the irregular refractory is 0.1 mm or more and 10 mm or less.

Images