JP2536873B2 - Gas blower repair method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot repair method for a gas blowing device such as a porous nozzle that blows gas for the outside refining of molten steel.

[Conventional technology]

Conventionally, hot repair of a damaged portion having a gas injection hole in such a steelmaking facility has mainly employed a method by spraying in order to prevent blockage of the hole.

FIG. 2 shows, as an example, a hot repair state of the immersion pipe of the RH type degasser. Referring to the figure, at the time of installation, the repair material spraying pipe C is inserted into the wear dip pipe B, which had a thickness shape indicated by the one-dot chain line A, and the gas blowing pipe D provided in the dip pipe B is inserted. In order to prevent the opening E from being closed, the repair material F is sprayed onto the worn surface G while the gas is being sprayed from the spray pipe D.

[Problems to be solved by the invention]

In repairing by such a spraying method, not only the repairing material itself that comes from the spraying method itself, such as the addition of moisture to the spraying material, the adhesion to the repair surface, etc., but also the shape of the repaired body is restricted. However, it was not possible to obtain a repaired body having an accurate shape, and therefore the service life after repairing was short, which was a major obstacle in terms of operation.

The problem to be solved in the present invention is to find a method for preventing blockage of the gas injection pipe during repair work, regardless of the gas injection from the gas injection pipe provided in the immersion pipe, and thereby the conventional blowing method. Instead, a mold filling method for an amorphous fire resistant composition can be adopted to obtain a repair work body having good durability.

[Means for solving problems]

According to the present invention, a flexible rod is inserted through a gas blowing pipe, the tip of the flexible rod is projected to a required length equal to or greater than the construction thickness of the repair material, and then a refractory material is filled with a formwork. By repairing, the above-mentioned subject was able to be achieved.

The mold according to the present invention is made of a material and a material having such a thickness that it can be immediately melted when the immersion pipe is immersed in molten steel after repair.

The flexible rod is preferably one having heat resistance such as iron wire, wire, silica fiber, etc., and can be inserted into the gas blowing pipe by a feeding device.

〔Example〕

FIG. 1 shows the present invention in which the wear surface G of a castable layer formed on a perm brick P provided with a stud S of a tip dipping pipe B of a dipping rising pipe of an RH type suction vacuum refining apparatus An example applied to repair is shown.

Referring to FIG. 1, reference numeral 1 denotes a mold for casting a repair material, which is a mold having the same internal shape as when newly installed.
The mold 1 is made of an ordinary iron plate having a thickness of 2 to 3 mm, and a sealing material 2 made of an amorphous refractory, an inorganic fiber, etc.
Is attached to prevent wear of the refractory material press-fitted into the mold 1 in contact with the outer wall of the lower end of the wear dip tube B. Three
Indicates a repair material press-fitting branch pipe provided in the substantially central portion of the mold 1, and is branched into several pieces so as to enable uniform press-fitting and is connected to the repair material feed pipe 4. Reference numeral 5 denotes a loading / unloading device for a flexible rod-shaped body 6 such as a wire having a diameter smaller than the inner diameter of the gas blowing pipe D, which is attached to an appropriate frame outside the dipping pipe B.

When carrying out the method of the present invention, the mold 1 having a predetermined shape is installed so as to cover the inner wear surface G, and the flexible rod-shaped body 6 is inserted into the gas blowing pipe D from the loading / unloading device 5 of the rod-shaped body 6. , And the rod-shaped body 6 is projected from the opening E of the gas blowing pipe D and brought into contact with the inner surface of the mold 1. After that, the repairable meltable castable is filled in the mold 1 from the repairing material feeding pipe 4 through the repairing material press-fitting branch pipe 3. Since the rod-shaped body 6 near the inner diameter of the gas injection pipe D is installed in the mold 1, that portion forms a gas injection passage, and then the rod-shaped body 6 is connected to the gas injection pipe D.
By pulling out from above, a gas blowing passage which is continuous with the gas blowing pipe D and has an opening on the inner surface of the construction body is formed.

Further, the installed formwork 1 is installed as it is after the repair work body is formed. This formwork 1 is melted when the immersion pipe is immersed in the molten steel after repair, and the gas injection hole is opened.

〔The invention's effect〕

The method for repairing a gas blower into a molten metal according to the present invention makes it possible to effectively prevent clogging of a gas blow hole, thereby replacing the repair method that has conventionally relied on spraying with a formwork. A construction method can be adopted and a repaired body with good durability can be obtained.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows an example of a conventional repair method by spraying. 1: Formwork, 2: Sealing material 3: Repair material press-fitting branch pipe, 4: Repair material feeding pipe 5: Rod entry / exit device, 6: Flexible rod A: Immersion pipe thickness at the time of installation B: Wear dipping pipe C: Repair material spray pipe D: Gas injection pipe E: Opening F: Repair material G: Wear surface P: Permanent brick S: Stud

Claims (1)

(57) [Claims] 1. A flexible rod is inserted through a gas blowing tube,
Repairing a gas blowing body characterized by forming a gas blowing hole by penetrating a gas blowing pipe and projecting a tip of the flexible rod to a required length, and then filling and repairing with a refractory material. Method.