JPS6038158Y2 - smelting furnace - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a smelting furnace.

Generally, a smelting furnace used in a continuous steel manufacturing process, for example, is equipped with a plurality of spray jackets 2 lined up around a furnace body 1 as shown in FIG. 1, or a furnace body 1 as shown in FIG. A plurality of copper block jackets 3 are arranged in line around the periphery of the reactor, and these jackets 2 and 3 serve to cool and protect the refractories such as the bricks 4 of the furnace body 1 in the path 9471 section. .

The former spray jacket 2 achieves a cooling effect by having cooling water sprayed thereon, and the latter copper block jacket 3 has cooling water circulating in cooling water passages formed inside each of the jackets. It has a cooling effect.

Incidentally, it is desirable that these jackets 2 and 3 behave in the same manner as the bricks 4 that threaten the furnace body 1.

That is, for example, if the spray jacket 2 were to be connected to the cell shell 5 so that it would not move, stress due to the thermal expansion of the furnace would occur, and the slip line would occur on the lower surface of the jacket 2, that is, at the portion corresponding to the pass line L. This is extremely dangerous, and if it is necessary to absorb the expansion of vertical joints in the circumferential direction of the refractory of the furnace body 1, and if the absorption expansion is not complete, the brick 4
A gap will be created between them.

As a result, there is a risk of a serious water leakage accident.

On the other hand, for example, even if the copper block jacket 3 were to be fixed, stress due to furnace thermal expansion would occur and the bricks 4 would
There is a risk of serious water leakage due to cracking.

Ideally, therefore, both jackets 2.3 should behave similarly to the brick 4.

For this purpose, the furnace body 1 should be used rather than the block jacket 2.
It is preferable to adopt a block-shaped copper block jacket 3 that is arranged in a row in a local area.

However, conventional smelting furnaces employing such a copper block jacket 3 have had the following problems.

That is, in the conventional copper block jacket 3, as shown in FIG. 3, the mutually adjacent ends 3a are simply flat surfaces along the radial direction of the furnace body 1. Even if the parts 3a are bonded to each other, due to the expansion of the furnace as the furnace is used, the ends 3a open to each other and a gap is created.

Moreover, since the expansion of the furnace increases due to the influence of secondary expansion due to repeated heating and cooling of the furnace, these ends 3a
The gap between them becomes larger.

Further, when the copper block jacket 3 is displaced toward the cell iron skin 5 side, the distance between the ends 3a is about 10 to 15 degrees.

In addition, 6 in the figure is an expansion absorbent.

When the end portions 3a of the copper block jacket 3 are opened in this way, the cooling in the gap becomes weaker, and the refractories in the furnace such as the bricks 4 melt when the furnace is used. As the loss progresses, the end 3 of the copper block jacket 3
There is an extremely high possibility that molten metal will leak in the gap between a.

Incidentally, the refractories in the furnace inevitably become prone to melting and damage with long-term use, but the copper block jacket 3 on the rear side
When the cooling from the furnace is sufficient, even if the refractories in the furnace are melted down, a coating layer will be formed there and there will be no leakage of molten metal.

However, as mentioned above, if the cooling between the ends 3a of the copper block jacket 3 is not sufficient, leakage occurs from the gap.

This idea was developed in consideration of the various circumstances mentioned above, and employs a block jacket as a means of cooling the furnace, and provides undulations that coincide with each other at the ends of the adjacent block jackets. By forming an elevation along the circumferential direction of the furnace on the joint surface of the end, the above-mentioned conventional problem can be solved, and the block jacket behaves in the same way as a brick, and the blocks adjacent to each other are separated by the expansion of the furnace. It is an object of the present invention to provide a smelting furnace in which no gap is formed between the ends of the jacket.

This invention will be explained below based on an embodiment shown in FIGS. 4 to 6.

FIG. 4 shows the arrangement of the block jackets 7 as seen from above the furnace, and the block jackets 7 are arranged along the periphery of the furnace body 1, similar to the conventional block jacket 3 described above.

A cooling water passage 8 is formed inside each block jacket 7, as shown in FIG. By passing through the inside, a predetermined cooling effect is achieved.

Incidentally, in the block jacket 7, adjacent end portions 7a are provided with undulating portions that coincide with each other.

That is, one of the mutually adjacent ends 7a is provided with a protrusion 7b located closer to the inside of the furnace so as to extend from the upper surface to the lower surface of the block jacket 7 itself, and the other end 7a is provided with a protrusion 7b that extends from the upper surface to the lower surface of the block jacket 7 itself. is a protrusion 7c located on the outside of the furnace.
is provided so as to extend from the upper surface to the lower surface of the block jacket 7 itself.

Therefore, the joint surfaces of the protrusions 7b and 7c of the block jacket 7 that are adjacent to each other become an elevation surface 7d along the circumferential direction of the furnace.

This vertical surface 7d extends from the upper surface to the lower surface of the block jacket 7 itself.

Therefore, in a smelting furnace equipped with such a block jacket 7, the block jacket 7 behaves in the same manner as a brick, similar to the block jacket 3 described above.

Therefore, stress due to furnace thermal expansion is small.

When the distance between adjacent block jackets 7 increases due to the behavior of the block jacket 7, the vertical surfaces 7d of the end portions 7a of the block jackets 7 slide while remaining in contact with each other.

Therefore, even when the furnace expands, no gap is created between the ends 7a of the block jackets 7 that are adjacent to each other.

Therefore, each block jacket 7 exerts an even and sufficient cooling effect on the bricks inside thereof, and leakage of molten metal due to local weakening of the cooling effect is avoided.

In addition, since the block jackets 7 are set in a positional relationship in which their end portions 7a match each other, it is easy to set them during furnace construction.

As explained above, according to the smelting furnace according to this invention,
Block shuts are used as a means of cooling the furnace, and the joint surfaces of their mutually adjacent ends form an elevational surface along the circumferential direction of the furnace, so the elevational surface slides due to the behavior of the block jacket. will come into contact.

Therefore, the block jacket itself behaves like a brick and has less stress due to furnace thermal expansion.

Moreover, no gap is created between the ends of adjacent block jackets even when the furnace expands, and leakage of molten metal from the joints of the block jackets can be prevented.

In addition, the block jacket can be easily set during furnace construction.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted vertical cross-sectional view of a smelting furnace equipped with a spray jacket, Fig. 2 is a partially omitted longitudinal cross-sectional view of a smelting furnace equipped with a block jacket, and Fig. 3 is a conventional smelting furnace equipped with a block jacket. Partially omitted cross-sectional views of the smelting furnace, Figures 4 to 6
The figures show one embodiment of this invention, with FIG. 4 being an explanatory view of the deployment form of the block jacket, FIG. 5 being an enlarged view of the joint portion of the block jacket, and FIG. 6 being a sectional view of the block jacket. 7...Block jacket, 7a...
End, 7d... Elevation, 8... Cooling water passage.

Claims (1)

[Scope of utility model registration request] Around the furnace body, block jackets having cooling water passages inside are arranged side by side, and the ends of the adjacent block jackets are provided with undulating parts that match each other, and the joint surfaces of these ends are provided with the furnace. A smelting furnace characterized by forming an elevation along the circumferential direction.