JPS58184392A - Method of sealing position where hole is bored - 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 The present invention relates to a method for sealing a perforated part such as a metallurgical furnace exhaust flue or ore transportation piping.

Conventionally, metallurgical furnace exhaust gas usually contains SO2, and in this case, metal parts such as flues corrode and form holes, or ore and coal transportation lines, etc., wear out and form holes. This not only causes the leakage with the air and increases the amount of exhaust gas, but also reduces the temperature If around the leakage point and promotes corrosion caused by 802.

There were drawbacks such as exhaust gas leaking and polluting the environment.

Sealing method C2 for repairing the above hole is a sealant? It is common to attach an edge to the M connection, etc., but in the flue leading to the bag filter, welding sparks can cause problems such as burnout of the bag filter, and in transportation equipment for ore etc. Since there are blind dogs etc., will it be operated once? I had to stop and then do the tie-up work.

In addition, even in areas where welding sparks are not a problem, such as in rollers and electrostatic precipitators, it is difficult to weld in places where the draft is negative because the metal from the bathtub is sucked in. It was extreme.

There is also a method of applying sealant to the hole using adhesive tape or a commercially available adhesive, but this does not work.

However, in areas where the temperature exceeds 100 degrees Celsius, such as the outer surface of the lining, the durability is low (it becomes useless within a few days).

This invention has been made in view of the above-mentioned circumstances, and provides a method for sealing a hole that simplifies the sealing method for repairing a hole and has good sealing performance and durability. This is what we provide.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the figure, l is the flue,
2 is a perforated area. To seal the perforated part 2t, first, the part 2a of the part 2a of the part f3 in the perforated part 2 of the flue 1 and the piece rkJ of the sealing material 3 are polished smooth.
Apply adhesive to this polished surface and stick it.

Here, as the upper placement agent, metal oxide powder such as bone ash or silica sand (kneaded into a shape with silicate powder (water glass)) is used. :1 The above adhesive contains fine powder alumina, which has a smaller particle size than metal oxide powder. If more than twice the amount of metal oxide powder is mixed, the adhesive force will become even stronger. However, if more than twice the amount of metal oxide powder is mixed, the adhesive force will not change and it is uneconomical.

Further, the particle size of the alumina powder is preferably smaller than that of the metal oxide powder.Also, oxide powder with a high melting point other than alumina is also acceptable.

Therefore, according to the experimental results according to the present invention, it is best to mix the alumina powder at a ratio of 1:1.Experimental examples according to the present invention will be described in detail below.

<Experimental example> Commercially available silica sand (5i (h 84.2% mu 120
312.5'l) and alumina ultrafine powder in a ratio of 1:1, water glass (sodium silicate) was added to the mixture, and the mixture was kneaded until it became hard and sticky, and this was used as a fixing agent.

When the above-mentioned adhesive was applied to the perforated areas of the dirt and electrostatic precipitator, where the surface temperature was 300 to 400℃, and to the polished surface of the sealant, the adhesive strength was strong and the durability was further improved. It was confirmed that the product lasted for more than 6 months in places where conventional cloth adhesive tapes and commercially available adhesives lasted only 4 to 5 days.

As explained in detail above, according to the method of sealing a hole according to the present invention, there is no need for labor such as welding work, and there is no fear of ignition of ore, etc., so repairs can be completed in a short time. It is.

It was a cabinet. There is no need to stop the operation during sealing work, the work can be done easily and inexpensively, and the durability is also excellent.

[Brief explanation of the drawing]

The attached drawings are explanatory diagrams of essential parts showing one embodiment of the present invention. l... Flue, 2... Perforated area, 3... Sealing material. Patent attorney Hideaki Sato, representative of patent applicant Mitsubishi Metals Co., Ltd.

Claims (1)

[Claims] (IJ) When sealing a perforated part of metal equipment such as a metallurgical furnace flue, metal oxide powder such as bone ash or silica sand and water such as sodium silicate are mixed with lath. A sealing method for a perforated part characterized by using a sealing material similar to or different from the perforated metal part using a sealant in the form of a sealant. Alumina powder having a particle size smaller than 7n is mixed in a ratio of approximately 1:1 and used as a wetting agent in water glass. Seal method.