JPS5832134Y2 - smelting furnace - Google Patents

Description

[Detailed description of the invention] This invention relates to a smelting furnace used, for example, in a continuous steel manufacturing process, and particularly relates to a smelting furnace of the type in which a block jacket is provided along the entire outside of the furnace inner wall refractory in the pass line. It is something.

Conventionally, this type of smelting furnace, as partially illustrated in a vertical side view in FIG. It has a structure in which a copper block jacket 3 is attached to the upper side of a Java jacket 2 with bolts 4.

Further, a smelting furnace having a structure in which a block jacket is used in place of the Java jacket 2 is also known.

However, in the conventional smelting furnace having the above structure, the upper surface of the Java jacket (or block jacket) 2 is cooled and protected by the copper block jacket 2;
Between the inner surface 2a of the Java jacket (or block jacket) 2 and the refractory 1 due to thermal changes during use,
As shown in the longitudinal sectional side view of FIG. 2, the formation of a gap S was unavoidable.

When the gap S is created in this way, the cooling efficiency for the refractory 1 decreases, and the melting loss of the refractory 1 progresses.

Based on the above-mentioned viewpoints, this invention provides a smelting furnace in which no gap is created between the furnace inner wall forming resistor in the pass line and the Java jacket or block jacket on the outside. By forming the lower surface of the refractory closer to the inside of the furnace into a tapered surface that becomes lower toward the front of the furnace, the refractory that moves toward the center of the furnace body with respect to the thermal change of the refractory whose upper surface is in contact with this tapered surface. The tapered surface acts to suppress shrinkage, and on the other hand, when the refractory expands as it moves outward in the radial direction of the furnace body, it makes solid contact with the shirt jacket or block jacket. It is unique in that it prevents things from being eroded and damaged.

Next, the smelting furnace of this invention will be explained by way of examples with reference to the drawings.

FIG. 3 shows a longitudinal side view of the main parts of the smelting furnace of this invention.

As shown in the figure, a Java jacket 2 is provided around the entire circumference of the outer side of the furnace inner wall forming member 1 at the pass line BL.

A copper block jacket 3 is integrally fixed to the upper side of the Java jacket 2 with bolts 4.

Further, the refractory material 1 is lined closely with the inner surface 2a of the shirt jacket 2.

Furthermore, the lower surface 3a of the block jacket 3 closer to the inside of the furnace is formed into a tapered surface that becomes lower toward the inside of the furnace. are doing.

Note that a press water supply nozzle 5 is incorporated in the Java jacket 2, a cooling water supply vibro is cast in the block jacket 3, and the Java jacket 2 and the refractory 1 are on the refractory 7 below the pass line. , furnace wall bricks 8 are stacked on the upper side of the block jacket 3, and the outside is further covered with a furnace skin 9, unlike the conventional smelting furnace (
(See FIGS. 1 and 2).

In addition, FIG. 4 also shows the shirt jacket 2 in FIG.
The structure is the same as that of the smelting furnace shown in FIG. 3, except that the block jackets 2' and 2'' are replaced with two block jackets 2' and 2'', and the inner surfaces 2a' and 2a'' of each are brought into close contact with the refractory 1. A further embodiment of the smelting furnace is likewise shown in a longitudinal side view.

Since the smelting furnace of this invention has the above-mentioned configuration, even if the refractory 1 shrinks due to thermal changes, the refractory 1 whose upper surface 1a is in contact with the lower surface 3a formed on the tapered surface of the block jacket 3 is prevented from shrinking inward by the lower surface 3a, and the inner surface 2a or 2a' of the Java jacket 2 or block jacket 2', 2''
, 2a'', the Java jacket 2 or the block jackets 2', 2'' continue to receive sufficient cooling action from the block jacket 3, and the occurrence of melting damage is significantly reduced.

Further, when the refractory e71 whose upper surface is in contact with the lower surface 3a of the block jacket 3 is about to expand, the refractory 1 will react to the inner surface 2a of the Java jacket 2 or the block jacket 2', 2'' due to the reaction force against the lower surface 3a. or 2
Java jacket 2 or block jacket 3) is pressed against Java jacket 2 or block jacket 3) 2', 2'' and maintains close contact with block jacket 3. The cooling effect will continue and will not decrease significantly.

As is clear from the above explanation, according to the smelting furnace of this invention, even if the refractory forming the inner wall of the furnace in the pass line contracts or expands due to thermal change, the refractory remains on the entire outer circumference. Since the refractory does not separate from the Java jacket or block jacket, the cooling efficiency of the refractory is maintained at a high level, resulting in practically useful effects such as no occurrence of melt damage.

[Brief explanation of the drawing]

Figure 1 is a vertical side view showing the furnace wall structure near the pass line of a conventional smelting furnace, Figure 2 is a vertical side view of the portion corresponding to Figure 1 when subjected to thermal changes, Figures 3 and 4. 1A and 1B are longitudinal sectional side views showing main parts of an embodiment of the smelting furnace of this invention. In the drawings, 1... refractory, 1a...
・Top surface, 2... Java jacket, 2a...
...Inner surface, 2'. 2″・・・Block jacket, 2a′, 2a″
...Inner surface, 3...Block jacket, 3a...Bottom surface, 4...Bolts,
S... Gap.

Claims (1)

[Scope of utility model registration request] In a smelting furnace having a structure in which a block jacket is provided along the entire outer circumference of the furnace inner wall forming member at the pass line, the lower surface of the block jacket closer to the inside of the furnace is formed into a tapered surface that slopes low toward the inside of the furnace. A smelting furnace featuring: