JPS61285380A - Smelting furnace - 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] This invention relates to a smelting furnace C2.

[Conventional technology]

Generally, in a continuous steelmaking process C; in a refining furnace (2), gas, powder, etc. are injected at high speed through a lance, so there are waves on the surface of the molten metal. Because of this, the bus line position on the side wall of the furnace body is most severely eroded.Therefore, in conventional smelting furnaces, a cooling block is installed over the entire circumference of the side wall C2 at the bus line position. The jacket 11r is buried and C2 is installed to suppress erosion of the inner surface of the side wall.

Conventionally, as this type of smelting furnace, the one shown by reference numeral 1 in FIG. 3 is known. This smelting furnace 1 has a bottom wall brick at the bottom of the furnace! 1 is provided, and around this bottom wall brick 11 (2 is the lower peripheral wall brick 12 is stacked upward C bifurcated 7), on the upper surface of this lower peripheral wall brick 12, on the inner peripheral side A bus line brick 13 is placed.The bus line brick 13 is an electroformed brick type, and is thick (
The thickness of the furnace body in the radial direction C2 is 190 mm. Furthermore, a bus line block jacket 14 is provided on the outer peripheral side of the bus line brick 13 for cooling the bus line brick 13 and suppressing melting damage. This bus line block jacket 14 is made of a copper cake jacket, is formed at the same height as the bus line brick iris 3, and has # marked on its inner peripheral surface 1 on the outer peripheral surface of the bus line brick 13. This bus line block jacket 14, which is arranged in contact with each other,
A presser block jacket 15 is placed on the upper surface of the bus line brick 13. This presser block jacket 15 is also made of a copper cake jacket, and the lower surface that comes into contact with the bus line brick 13 is
The inner circumferential side (also formed in a downwardly sloping direction).

By tilting in this way, it is possible to prevent a gap from being formed between the bus line brick 13 and the bus line block jacket 14 due to the difference in thermal expansion, which are in contact with the lower surface. [Problems to be Solved] However, in the above-mentioned smelting furnace I, when used for a long period of time, the bus line bricks 13 are greatly eroded, and the lower peripheral wall bricks 12 below the bus line bricks 13 are cracked, peeled, and There was a problem in that it would fall off.

Furthermore, if molten metal leaks out of the furnace, the furnace must be shut down, cooled, and repaired, resulting in a large amount of expense. While it would require human intervention and result in a huge loss, 1.
Point or heat nine.

By the way, as a result of using the above-mentioned smelting furnace 1 for two years, the bus line bricks 13 were melted and damaged as shown by arrow A in Fig. 4;
The XjN brick 12 also peeled off and fell off as shown by arrows B and CC in the figure.

[Purpose of the invention] Even after long-term use, the bath line bricks have little melting damage, and the lower C bifurcated rL + lower peripheral wall bricks do not peel or fall off, and prevent molten metal leakage, etc. The aim is to provide a smelting furnace with no possibilities.

[The diameter path leading to the invention] In order to solve the above problems, the conventional smelting furnace
As a result of analysis, it was found that the cause was as follows.

That is, in the smelting furnace 1, the thickness of the bus line brick 13 in the radial direction of the furnace body is set to be thicker f in anticipation of melting damage. As a result, after long-term use, the inside of the C2 furnace will be severely eroded. Since the downward pressing force due to 13 is reduced,
The downward pressing force caused by the lower circumferential wall brick 12 and the upward reaction force caused by the bottom wall brick 11 are n("f'L8i? 4, arrow P, As shown by Q (the two outer circumferential sides and the inner circumferential side are applied at the same time), a split n occurs in the lower peripheral wall brick 11, and peeling and falling occurs from that part.

Therefore, in order to sufficiently cool down the wall surface inside the furnace, the bus line bricks were made thinner in the radial direction g of the furnace body, and it was found that melting loss was reduced7. It has been found that if the thickness is made too thin, cracks will occur due to the pressing force applied to the upper and lower rolls of the bus line brick C.

For this reason, we can prevent the bath line bricks from melting and damage.
Furthermore, in order to prevent the lower peripheral wall bricks from peeling off and falling off, it was found that it was necessary to set the thickness of the bus line bricks in the radial direction C of the furnace body within a certain range C2.

[Structure of the Invention] This invention was made based on the above-mentioned knowledge. ,
If the dimension in the height direction of the bus line brick is H, then 0
．． The configuration is set as 3H to 1503LIl - [Example of actual rights] Below, 9J! of this invention! For examples, see Figure 1 and @
This will be explained with reference to FIG. In addition, these figures C-t? The portion C2 having the same configuration as that of the conventional example is given the same reference numeral and the explanation thereof will be omitted.

Fig. 1 is a diagram showing a tank refining furnace 2 according to the present invention.7 In this tank refining furnace 2c, the bath line bricks 21 are made of electroformed bricks and extend in the radial direction of the furnace body. The thickness is 13QIIJl and the height is 3001Lllζ2. The bus line block jacket 14 provided on the outer peripheral side of the bus line brick 21 is also formed at the same height I as the bus line brick 21. The bus line L is set at a position 70 to 80 points above the height of the bus line brick 21 from the lower end of the bus line brick 21. , the thickness of the bath line brick 21 in the radial direction l2 of the furnace body is 1
Since the thickness is 30u, unless the thickness is too thick and the wall inside the furnace of the bus line bricks is not sufficiently cooled, then either the thickness is too thin and the bricks applied in the vertical direction are There is no cracking due to the weight (2), and the wall inside the furnace is sufficiently cooled (2).
Erosion damage of bus line bricks can be kept within a small range C2.

Nine, in the above-mentioned smelting furnace 2, the bus line L is set at a position 70 to 80 widths from the bottom of the bus line brick 21 to the height of the bus line brick 21. Block jacket tS that suppresses the harsh bass line position
Within the range of cooling by t2; can be moved;
Therefore, the damage to the bus line bricks 21 can be kept to a small extent. -1.Please note that the location of the bus line L where the most severe erosion is farthest from the bottom surface of the bus line brick 21 is divided into two parts, so the part of the bus line brick 21 that is in contact with the lower peripheral wall brick 12 will be eroded. Therefore, cracking of the lower peripheral wall brick 12 and accompanying peeling-off can be prevented.

In addition, since the position of the bus line L where the erosion is most severe is set a little below the top 5111 of the bus line brick 21 @1, the erosion will not reach the press block jacket 15, and the press block jacket 15
damage to the product can be prevented.

By the way, as a result of using the above smelting furnace 2t for 2 years, the bus line brick 21 was not melted because it was within the range of 2, as shown by the arrow in the FA2 diagram, and the lower part of the smelting furnace was divided into two parts. No cracks occurred in the surrounding wall brick 12C, nor did any peeling or falling occur.

In addition, in the above-mentioned example C2, the thickness e in the radial direction of the furnace body of the bus line brick 21 (2) is set to 1301131, but there is no need to limit it to this, and when the height of the bus line brick is set to JkH. If the lower limit of the thickness of the bus line brick 21 is 0.3H1, the height of the bus line brick 21 is usually 250B to 350U. Therefore, the lower limit of thickness 0.3H is 75111~105IuIIOK tonal.

〔Effect of the invention〕

As explained above, in this invention, the thickness of the bus line brick in the radial direction C of the furnace body is 0.3H, where H is the dimension in the height direction of the bus line brick.
%15011m, it is possible to suppress the melting damage of the bus line bricks to a small extent and also to prevent damage to the surrounding bricks. It is possible to save a huge amount of cost and manpower, and to prevent huge losses due to molten metal leakage.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, and f
B2rgJ is a sectional view showing the state #11/ after using the smelting furnace shown in Fig. 1 ζ2 for two years, and Fig. 3 is a new view showing an example of a conventional dyeing furnace. Figure 4 is a sectional view showing the state of the smelting furnace shown in Figure 3 after being used for two years.
...Bath line ~ 2...Smelting furnace, 21...Bath line brick. Figure 2

Claims (1)

[Claims] At the bus line position in the side wall of the furnace body, from the inner circumferential side of the side wall to the outer circumferential side, the inner surface is exposed in the furnace and the bus line brick made of electroformed brick and the outer surface of this bus line brick are placed. In a smelting furnace in which a contacting bus line block jacket is provided in an annular manner over the entire circumference of the side wall of the furnace body, the thickness of the bus line brick in the radial direction of the furnace body is determined by the height of the bus line brick. The horizontal dimension is H
Then, the smelting furnace is characterized in that it is set to 0.3H to 150mm.