JPH08295916A - Furnace opening part metal in converter - Google Patents

Abstract

PURPOSE: To improve a holding function of a brick by integrating lining brick at a furnace opening part of a converter with a furnace opening part metallic base material and to prolong the service life of the brick by preventing the erosion of the brick and the breakage of the brick at the time of operating. CONSTITUTION: The furnace opening part metal structure is composed of the furnace opening part metal 2 and the lining brick 1 inserted with the furnace opening part metal 2. Otherwise, a casting block inserting the lining brick 1 and an outer peripheral metal arranged at the outer periphery of the casting block are combinedly formed. The lining bricks 1 are firmly held by the furnace opening part metal 2 or ribs 3 of the casting block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a furnace mouthpiece for a converter. Further, it can be used in a similar furnace body structure such as a smelting reduction furnace and an electric furnace.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a lining brick 1 at a furnace mouth portion of a converter has a mortar or castable joint as a joint material inside a furnace mouth metal fitting 2 which is bolted to an upper portion of a converter furnace body. Was built in. Alternatively, Japanese Patent Laid-Open No. 5-1254
Japanese Patent Laid-Open No. 26-26 discloses a furnace mouthpiece structure of a converter in which bricks are subjected to high-precision groove processing and attached to the lower surface of the furnace mouthpiece with a hanging metal fitting.

[0003]

However, the above-mentioned prior art has the following problems. (1) A part of the lining bricks is melted and dropped due to high heat, and the bricks around it are dropped from there. (2) Since the chute for throwing scraps into the converter is moved up and down and tilted by the overhead crane, the tip of the chute may collide with the converter furnace mouth part. Destroyed. (3) As the converter repeatedly tilts, the joints of the lining brick open.

(4) When the brick is partially destroyed or the joint is opened, the molten steel and slag scattered by the blow-in enter there and solidify. Further, when the metal that adheres and accumulates on it is removed, a part of the lining brick also peels off at the same time. (5) If the bricks lined inside the furnace mouth are peeled off and disappear, the bricks in the cone portion at the upper part of the converter will also fall off early and the converter body will be exposed to high heat and damaged. Therefore, an object of the present invention is to provide a furnace mouthpiece of a converter capable of enhancing the retention function of the brick in order to prolong the life of the lining brick and preventing melting damage of the brick and damage of the brick during the bullion removal work. Especially.

[0005]

SUMMARY OF THE INVENTION According to the present invention, in a furnace metal fitting which is installed in a furnace mouth of a converter and is provided with an inner brick, the inner brick is integrally formed with a base metal of the furnace mouth to form a cast dolly. Or, a lining brick is integrally formed with a casting block to form a cast body, and the lining brick is fastened and formed with a furnace mouth outer peripheral metal piece installed on the outer periphery of the casting block.

[0006]

In the furnace mouth metal fitting of the present invention, since the lining brick is integrated with the casting base material, the brick joint does not open even when subjected to the impact of the scrap chute collision and the tilting of the converter itself. It is possible to prevent bricks from being damaged during the bullion removal work. Moreover, even if a part of the lining brick is melted down,
The bricks around it will not fall off. Therefore, the brick of the cone portion in the upper part of the converter can be held for a long time, and the life of the converter can be extended.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram showing an embodiment of claim 1, in which a refractory lining brick 1 is integrally cast into a furnace mouthpiece 2 and firmly held by a cast iron rib 3 made of FCD. It When the lining brick 1 is cast into the furnace mouthpiece 2, after placing the lining brick 1 in the sand mold of the furnace mouthpiece 2, attach a buffer material with high heat insulation to the brick surface that comes into contact with the molten metal to prevent thermal shock. Protects bricks and prevents cracking during casting.

The lining brick itself has a size and weight suitable for being hand-carried by a molding operator, and a cushioning material is also sandwiched between adjacent bricks. In addition, if the brick itself has an extreme difference in the three sides of the length, width, and length, cracks are likely to occur during casting, so the difference should not be extremely different. The furnace mouth metal 2 is manufactured by dividing the circumference into 4 or 6 parts and installed in the converter furnace mouth.

FIG. 2 is a plan view showing a plane structure in the case of four divisions. In some cases, the cooling water pipe 8 is cast in the furnace mouth metal in order to improve the cooling effect and the heat resistance of the refractory brick.

FIG. 3 is a sectional view showing the structure of another embodiment of the first aspect of the present invention, in which the cast iron rib 3 extends to the inner surface of the furnace, and the stud 4 is arranged on the end surface of the cast iron rib 3 to enhance the retainability of the castable 10. It is a thing. FIG. 4 is a sectional view showing the structure of an embodiment of claim 2. The lining refractory brick 1 is integrally cast with a casting block 5 made of FCD, and the casting block 5 is loosely attached to the furnace outer peripheral metal piece 6. It is fitted and fastened by the pin 9.

FIG. 5 is a sectional view showing the structure of another embodiment of the second aspect of the present invention, in which the casting block 5 and the furnace outer peripheral metal piece 6 are joined together by pins 9 as in FIG. . Further, in the rib structure in which the lining refractory brick 1 is integrated with the casting block, the cast iron rib 3 extends to the inner surface of the furnace as in FIG. 3, and the stud 4 is arranged on the end surface of the castable rib 1.
The retention of 0 is improved.

FIG. 6 is an example in which the structure of claim 2 is applied to a converter cone portion. The brick-integrated casting block 5 is fastened to the converter body 7 with bolts, and castable 10 is filled between them. ing. The present invention is not limited to the above-mentioned embodiments, but can be applied to applications other than converters such as smelting reduction furnaces and electric furnaces, and various modifications can be made without departing from the gist of the present invention. Of course.

[0013]

As described below, according to the converter mouthpiece of the present invention, (1) even if a part of the lining brick is melted by high heat, The bricks are integrally cast into the furnace metal fittings, and bricks do not fall off from around the melted part. (2) Since the lining bricks are firmly held by the furnace mouthpiece, the brick joints did not open even when subjected to the impact of a scrap chute collision and repeated tilting of the converter itself, and were scattered by blowing. No molten steel or slag will enter. (3) Since the studs can be laid on the tips of the cast iron ribs, the castable layer can be firmly held and falling off can be prevented.

(4) A part of the lining brick is not peeled off when removing the metal that adheres to and is accumulated in the furnace opening.
(5) The brick in the upper cone portion of the converter can be held for a long time, and the production cost occupied by the furnace material can be reduced. (6) The life of the converter can be extended. (7) When the lining brick is renewed, it is possible to obtain an excellent effect such that it is sufficient to renew only the casting block integrated with the brick without renewing the entire furnace mouthpiece. (8) When the cooling water pipe is cast into the furnace mouthpiece, the inner brick is firmly held by the furnace mouthpiece, so that the inner brick has a water cooling effect on the furnace mouthpiece and the heat resistance of the inner brick is improved. To do.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional configuration diagram showing an embodiment of a furnace mouthpiece according to claim 1 of the present invention.

FIG. 2 is a plan view showing an embodiment of the furnace mouthpiece according to claim 1 of the present invention.

FIG. 3 is a vertical cross-sectional configuration diagram showing another embodiment of the furnace mouthpiece according to claim 1 of the present invention.

FIG. 4 is a vertical cross-sectional configuration diagram showing an embodiment of the furnace mouthpiece according to claim 2 of the present invention.

FIG. 5 is a vertical cross-sectional configuration diagram showing another embodiment of the furnace mouthpiece according to claim 2 of the present invention.

FIG. 6 is a vertical cross-sectional configuration diagram showing an application example of the configuration according to claim 2 of the present invention.

FIG. 7 is a vertical cross-sectional configuration diagram showing an example of a conventional technique.

[Explanation of symbols]

 1 Lined bricks 6 Outer peripheral hardware 2 Furnace mouth metal fittings 7 Converter body 3 Ribs 8 Cooling water piping 4 Studs 9 Pins 5 Cast blocks 10 Castables

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koura Shiraishi 46-59 Nakahara, Tobata-ku, Kitakyushu City Nippon Steel Corporation Machinery & Plant Division (72) Inventor Koichiro Fujii 11-1 Showa-cho, Kure City, Hiroshima Prefecture No. 11 Kure Steel Works, Nisshin Steel Co., Ltd. (72) Keiji Akutaya 11-1 Showa-cho, Kure City, Hiroshima Prefecture Nisshin Steel Co., Ltd. Kure Works

Claims (2)

[Claims] 1. A furnace for a converter, wherein a lining brick is installed at a furnace mouth of the converter, and the lining brick is integrally formed with a base material of the furnace mouth to form a cast-roughened furnace. A clasp. 2. A furnace opening metal fitting in which a lining brick is installed at a furnace opening of a converter, the lining brick is integrally formed with a casting block to form a cast case, and the furnace opening is provided on the outer periphery of the casting block. A furnace port metal fitting for a converter, which is formed by being fastened to a peripheral metal fitting.