JPH05195045A - Method for repairing circulating tube in vacuum degassing equipment - Google Patents

Abstract

PURPOSE:To surely execute a repairing work in a short time by coating an eroded position with MgO-C series sleeve brick and pressurize-filling up dry-type monolithic refractory between the above brick and the eroded part at the time of repairing the worn refractory material on the inner surface of a circulating tube in a vacuum degassing refining apparatus for molten steel. CONSTITUTION:In the case of decarburize-refining the molten steel in a ladle with the vacuum degassing apparatus, when the refractory brick 4 of the circulating tube for circulating the molten steel in the vacuum space of the ladle and the vacuum degassing apparatus erodes, the MgO-C series sleeve brick 3 having the same inner diameter as the inner diameter of the circulating tube is arranged at the eroded part, and the dry-type monolithic refractory 5 is pressure-fed, filled up and repaired through a cyclone 6 in the space between this sleeve brick 3 and the eroded refractory brick 4. The repairing of the high temp. circulating tube can simply and easily be executed in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a reflux pipe of a vacuum degassing facility.

[0002]

2. Description of the Related Art As a method of repairing a return pipe, a method of spraying an amorphous refractory material on a damaged surface, a method of setting a metal frame (core) in a molten steel passage hole and press-fitting an amorphous refractory material, A method is known in which a precast sleeve is provided in place of the child, and the outer periphery of the sleeve is filled with a wet type amorphous refractory. In addition, after a repair material having a specific composition containing a specific amount of the high softening point pitch and the low softening point pitch and other components in the basic refractory aggregate, is put between the reflux pipe and the core provided therein. , A method for repairing a reflux pipe for heating a vacuum degassing apparatus (Japanese Patent Laid-Open No. 62-120419, 62-1204)
No. 20) and the like are known.

[0003]

Since all of the above-mentioned conventional repair methods use wet type amorphous refractory materials, there are various drawbacks in repairing hot hot in a short time. Since the reflux pipe is exposed to the molten steel flow and exposed to harsh conditions, it has low durability after repairs and is subject to frequent repairs, which reduces productivity and makes it difficult to work due to heat. It is known that there are various problems.

[0004]

The inventors of the present invention have developed the repair method of the present invention as a result of various studies and experiments in order to solve the various defects of the conventional method as described above, and the technical constitution of the present invention is as follows. As specified in the claims, in repairing a reflux pipe of a vacuum degassing facility, a magnesia carbonaceous sleeve brick having the same inner diameter as the inner diameter of the reflux pipe is coaxially arranged at a repaired portion, and the outer circumference of the sleeve brick It is characterized by pumping and filling dry type amorphous refractory between the damaged surface of the recirculation pipe and the recirculation pipe, and by pressing and filling dry type irregular refractory into the repaired part with a cyclone, it is more effective. The repair work can be carried out accurately in a short time.

One of the applicants of the present invention has previously proposed a cyclone-type powder-particle injection device (Japanese Utility Model Publication No. 1-30799). This blowing device does not scatter the powder or granules (so-called dry type irregular refractory material) without spraying the liquid, and the powder or granules adhere to the construction site without scattering. It can be installed, and the carrier gas and powder particles blown into the cyclone body are tangentially blown into the inner peripheral surface of the cyclone body, so the gas and powder particles are separated by centrifugal force, and the powder particles This is because only the body drops from the discharge nozzle and is supplied to a predetermined place, while the carrier gas is discharged from the exhaust port, so that the powdery particles are not scattered.

The repair method of the present invention will be described in detail with reference to a concrete example shown in the accompanying drawings, which is based on the above-mentioned cyclone method for pressure feeding and filling method.

FIG. 1 is a vertical cross-sectional view at the time of repair work. A part is a reflux pipe and B part is a dip pipe. 1 is a dip tube inner tube brick, 2 is a dip tube outer tube castable, 3 is a magnesia carbonaceous sleeve brick according to the present invention, 4 is a reflux tube brick,
5 is a dry type irregular refractory according to the present invention, 6 is a dry type irregular refractory 5 being pumped to the repairing point of the reflux pipe.
It is a cyclone that uses a rotating method to fill.

As shown in the above specific example, the magnesia carbonaceous sleeve brick 3 has the same inner diameter as the inner diameter of the reflux pipe, and is coaxially arranged and fixed to the repaired portion of the reflux pipe. Then, the dry type amorphous refractory material 5 was pressure-fed and charged through the cyclone (6) between the sleeve brick 3 and the damaged surface of the reflux pipe, so that accurate filling could be performed without generating dust.

An example of the composition of a dry type amorphous refractory material is as follows.

[0010] It should be noted that the method of pressure-feeding / filling the powdery particles is not limited to the cyclone, and any other method that does not generate dust and does not scatter the powdery particles can be used.

[0011]

【The invention's effect】

 (1) Hot repair is possible and liquid does not evaporate.

(2) Since no dust is generated and no gas is generated,
Does not pollute the work environment.

(3) It can be operated remotely and can be automated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a specific example of the repair method of the present invention.

[Explanation of symbols]

 1 Immersion pipe inner cylinder brick 2 Immersion pipe outer cylinder castable 3 Magnesia / carbonaceous sleeve brick 4 Recirculation pipe brick 5 Dry type irregular refractory 6 Cyclone A Recirculation pipe B Immersion pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Miki, 3rd light, Oshima, Kashima-cho, Kashima-gun, Kashima-gun, Ibaraki Sumitomo Metal Industries, Ltd. Kashima Steel Works (72) Akira Takahashi, 3rd light, Oshima, Kashima-cho, Kashima-gun, Ibaraki Prefecture Sumitomo Metal Industries, Ltd. Kashima Works (72) Inventor Susumu Saegusa No. 3 Hikari, Kashima-machi, Kashima-cho, Kashima-gun, Ibaraki Prefecture Sumitomo Metal Industries, Ltd. Kashima Works

Claims (2)

[Claims] 1. Repairing a vacuum degassing equipment reflux pipe,
A magnesia carbonaceous sleeve brick having the same inner diameter as the inner diameter of the reflux pipe is coaxially arranged in the repaired portion, and a dry type amorphous refractory is pumped and filled between the outer circumference of the sleeve brick and the damaged surface of the reflux pipe. Characteristic vacuum degassing equipment reflux pipe repair method. 2. The method for repairing a reflux pipe of a vacuum degassing facility according to claim 1, wherein the dry type amorphous refractory material is pressure-fed and filled into a portion requiring repair by using a cyclone.