JPH05332684A - Lining method for refractory of evacuating and degassing device - Google Patents

Abstract

PURPOSE:To shorten a working time necessary for lining refractories for protecting heat insulating wool filled into a jointing section between a lower tank and a middle tank. CONSTITUTION:Annular iron frames are arranged along the circumferential surface of the inner wall of a jointing section between a lower tank 1 and a middle tank 2 with a predetermined interval. Prepared unshaped refractories is forced into a vertical supplying pipe 9b and a horizontal supplying pipe 9a, which are connected to the inside of the annular iron frame 10, by a pressure from the outside of the furnace whereby insulating wool 7, filled into the jointing section, can be protected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory lining method for a joint between a lower tank and a middle tank in a vacuum degassing apparatus.

[0002]

2. Description of the Related Art The degassing tank of a vacuum degassing apparatus is lined with refractory material, and in particular, as shown in FIG. 6, the refractory materials 3 and 4 are lined in the lower tank 1 and the middle tank 2, respectively. In order to prevent the part from being melted and damaged, it is common to stack a protective brick 5 (mainly using magro brick) on the overhanging portion 3a formed inside the upper end of the refractory 3 lined in the lower tank 1. is there. In addition, 11 shows two immersion pipes.

As shown in FIG. 7, the refractory 4 in the middle tank 2 is supported by the supporting metal 6 at the lower end, and the refractory 3 in the lower tank 1 must be loaded with such protective bricks 5. Expansion allowance (thickness of about 20 mm) between the upper end surface of the brick and the supporting hardware 6
Insulation wool 7 is provided in the space that forms the expansion allowance.
The tank skin is protected by filling the tank.

However, since the insulating wool 7 has a low degree of fire resistance, when the molten iron scattered in the tank comes into contact during vacuum degassing, the insulating wool 7 is melted and the iron shell of the tank is exposed, which is exposed to the high temperature in the furnace to cause red heat. Come to do. Eventually, the bottom portion of the brick 4 joint of the middle tank 2 is melted and damaged, and if the remaining thickness is reduced, the brick 4 of the middle tank is loosened and the repair range of the brick is expanded. Therefore, the protective bricks 5 are stacked on the joint between the lower tank 3 and the middle tank 4 to protect the heat insulating wool 7.

[0005]

As described above, in order to protect the thermal insulation wool by loading the protective bricks at the joint between the lower tank and the middle tank, the furnace worker must dock the lower tank and the middle tank after docking. However, there was the following problem because it was necessary to enter the tank and carry out the work of protecting bricks. (1) It takes a long time to cool the middle tank until the worker can enter the tank and perform work.

(2) In order for an operator to enter the tank and work efficiently and safely, it is necessary to blow oxygen gas to sufficiently dissolve and remove the metal and slag attached to the middle tank. It takes a long time to drain the bullion. (3) It takes 10 hours or more for the protective brick-laying work itself performed after docking the lower tank and the middle tank, and moreover, the work inside the tank is inevitably heavy under high temperature atmosphere.

(4) In order to perform the above (1), (2), and (3), it takes a long time to set up the replacement lower tank, and the operation rate for degassing treatment is significantly reduced. In order to solve the above-mentioned problems of the prior art, the present invention is a vacuum degassing method capable of lining a joint between a lower tank and a middle tank with a refractory material even if an operator does not enter the tank of the vacuum degassing apparatus. An object is to provide a refractory lining method for an apparatus.

[0008]

The present invention for achieving the above object provides a refractory lining method for a joint between a lower tank and a middle tank of a vacuum degassing apparatus, wherein the lower tank and the middle tank are joined together. Arranged an annular iron frame along the inner wall circumferential surface of the joint portion at a predetermined interval, between the inner wall circumferential surface of the joint portion and the annular iron frame via a supply pipe connected to the inside of the annular iron frame. A refractory lining method for a vacuum degassing device, characterized in that an amorphous refractory is press-fitted from outside the furnace.

[0009]

In the present invention, the irregular refractory is press-fitted into the joint between the docked lower tank and the middle tank from outside the furnace through the supply pipe into the gap between the annular iron frame and the inner wall circumferential surface. As a result, it is not necessary for the worker to enter the furnace to perform the work, and thus the auxiliary effects such as the tank cooling and the sinking of the metal as in the conventional example are unnecessary. In addition, because the refractory of irregular shape is press-fitted, brick laying work is eliminated, and the refractory lining time at the joint is greatly shortened, and the operation rate of the vacuum degassing apparatus is improved.

After the injection of the irregular shaped refractory, the supply pipes can be left in the furnace entirely or only in part, and the annular iron frame can be left in the furnace as it is, so the post-cleaning is easy. Is. The supply pipes and iron frames left in the furnace will melt during the molten steel treatment. It should be noted that the amorphous alumina refractory for press-fitting is generally made of a high-alumina-based material and is suitable, but it is not necessary to specify the material as long as the refractory is secured to some extent.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a horizontal sectional view taken along the line AA of FIG. 1, and FIG. 3 is a partially enlarged vertical sectional view of a joint portion. 1 and 2,
After docking the lower tank 1 lined with the refractory 3 and the middle tank 2 lined with the refractory 4 through the flange portion 8, the supporting metal 6 and the refractory 3 of the lower tank 1 are joined as shown in FIG. It is the same as the conventional method to fill the heat insulating wool 7 between them.

A supply pipe 9 consisting of a horizontal supply pipe 9a and a vertical supply pipe 9b is integrally connected to the annular iron frame 10 used in the present invention by welding. The horizontal supply pipe 9a is arranged so as to pass through the center of one annular iron frame 10, and both ends thereof communicate with the annular iron frame 10 to form two supply ports 12. A vertical supply pipe 9b is connected in the middle of the horizontal supply pipe 9a.

In the present invention, when docking of the lower tank 1 and the upper tank 2 is completed, the annular iron frame to which the supply pipe 9 is connected
The 10 is hung from above the middle tank 2 by a crane and carried into the furnace, and placed on the overhanging portion 3a formed inside the upper end of the refractory material 3 lined in the lower tank 1. When the annular iron frame 10 is set in the furnace in this way, the lower tank 1 and the middle tank 2
Circumferential surface of inner wall of refractory 4 and annular iron frame 10 at joint with
A space for filling the irregular-shaped refractory is formed with a predetermined space between and, and the vertical supply pipe 9b is guided to the outside of the furnace through one dipping pipe 11.

When pressurizing the amorphous refractory into the annular iron frame 10, after connecting the supply pipe 9b led to the outside of the furnace to an irregular refractory tank (not shown) through a hose or the like, When the irregular refractory supply device is driven to pump the irregular refractory,
Irregular shaped refractories are supplied through the supply pipes 9a and 9b to form an annular steel
It is pressed into the space formed by 10 and the circumferential surface of the inner wall of the refractory 4.
When the press-fitting of the amorphous refractory is completed, the amorphous refractory supported by the annular iron frame 10 is cured and solidified. Annular iron frame
10, the vacuum degassing of the molten steel is performed as it is. For example, the vertical supply pipe 9b, and if necessary, the supply pipe 9a may be cut and removed, but the molten steel may be left as it is. There is no problem because it melts during vacuum degassing.

In the above-mentioned embodiment, the case where one supply pipe 9a is placed over the annular iron frame 10 to form two supply ports 12 has been described. However, if the number of the supply ports 12 is two, the irregular refractory material is used. If it is not carried out sufficiently, as shown in FIGS. 4 and 5, two horizontal supply pipes 9a are used to intersect in a cross shape and connected to the annular iron frame 10, and the four supply ports 12 are connected. You may make it press-fit the amorphous refractory material. It is also possible to use a large number of horizontal supply pipes if it is necessary to supply the refractory material in a finely detailed manner.

[0016]

As described above, according to the present invention, the amorphous refractory is press-fitted from outside the furnace through the supply pipe into the annular iron frame set at the joint between the lower tank and the upper tank. There is no need for a person to enter the furnace and carry out the furnace construction work. This eliminates the need to cool the middle tank and flush the metal, and the working time to line the protective refractory on the joint is greatly reduced from the conventional 10 hours to 2 hours. Rate improvement is achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a partially enlarged vertical sectional view showing a B part in FIG.

FIG. 4 is a vertical sectional view showing an apparatus according to another embodiment of the present invention.

5 is a transverse cross-sectional view showing an arrow AA in FIG.

FIG. 6 is a vertical cross-sectional view showing a conventional device.

7 is a partially enlarged vertical sectional view showing a portion A of FIG.

[Explanation of symbols]

 1 Lower tank 2 Middle tank 3 Refractory (lower tank) 4 Refractory (upper tank) 5 Protective brick 6 Support metal 7 Insulation wool 8 Flange 9 Supply pipe 10 Annular iron frame 11 Dipping pipe 12 Supply port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masato Mizuto, 1st Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (no address) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (72) Masami Use Mizushima Kawasaki, Kurashiki City, Okayama Prefecture 1st Street (without street number) Inside the Mizushima Steel Works, Kawasaki Steel Co., Ltd. (72) Inventor Shuji Kawaji 1st street, Mizushima Kawasaki Street, Kurashiki City, Okayama Prefecture (without street) Inside the Mizushima Steel Works

Claims (1)

[Claims] 1. A method for lining a refractory material in a joint between a lower tank and a middle tank of a vacuum degassing apparatus, wherein an annular ring is provided along a circumferential surface of an inner wall of the joint between the lower tank and the middle tank. An iron frame is arranged, and an amorphous refractory is press-fitted from outside the furnace between the inner wall circumferential surface of the joint and the annular iron frame via a supply pipe connected to the inside of the annular iron frame. Refractory lining method for vacuum degassing equipment.