JPH0926266A - Method for repairing industrial apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a thermal insulation effect and prevent the leakage and entry of gas by spraying a repairing material produced by mixing rock wool, cement of a prescribed weight, one or more kinds of resin dispersion solution such as vinyl acetate resin of a prescribed weight with an aqueous solution and water on an outer surface. SOLUTION: A repairing material produced by mixing 20 to 70 parts by weight of rock wool, 20 to 60 parts by weight of cement and 5 to 20 parts by weight of one or more kinds of resin dispersion solution selected from a vinyl acetate resin, a silicone resin, a phenol resin, an acrylic resin, an epoxy resin, a butyral resin, an urethane resin, a melamine resin and a urea resin, with water is sprayed on the outer surface of an industrial furnace operated or stopped, or the outer wall surface of a dust collector by a sprayer 2. The rock wool opened by the sprayer 2 is supplied from a feeder 1, fibers are further opened by an opening machine 10 and sprayed from a nozzle 8 and the cement, water and the resin dispersion solution of the repairing material are mixed together by an agitator 6 and sprayed thereon.

Description

Detailed Description of the Invention

[0001]

The present invention relates to the outer wall of various industrial furnaces,
The present invention relates to a method of repairing various facilities used for industrial purposes such as outer walls of various dust collectors.

[0002]

2. Description of the Related Art Spray repair is widely performed in which a repair material or the like is locally sprayed on a damaged portion such as an outer wall surface of various industrial facilities in a hot or cold environment. Known spraying repair materials used include, for example, a mixture of alumina cement with light sand, a mixture of rock wool and a binder, and the like. In addition, a plate may be stacked on the damaged portion for processing.

[0003]

However, in the above-mentioned spray repair, since the spray repair material and the outer wall surface are poor in adhesiveness, the spray repair material sometimes drops off from the repaired portion. Further, since this repair material for spraying has almost no gas leakage prevention performance, dust and heat quantity may diffuse to the outside together with the gas in the equipment and the gas, and the equipment to be applied is It was limited to a very narrow range. On the other hand, for repairing damaged holes in outer wall iron plates and ducts of various industrial equipment, gas leaks have been performed conventionally by superimposing a blocking plate such as an iron plate on the damaged holes and welding the edges. However, this method has a problem that it takes a lot of labor and cost to complete the construction, especially when the equipment is large in size. It also required an outage.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, solves the conventional problems, is easy to install, has weather resistance, prevents gas leakage or invasion, and has a heat insulating effect. An economical repair method is provided, and by using a spraying device on the outer wall surfaces of various industrial furnaces that are in operation or are stopped, and the outer wall surfaces of various dust collectors, (1) 20 to 70 parts by weight of rock wool , (2) 20 to 60 parts by weight of cement, and (3) one or more resin dispersions selected from vinyl acetate resin, silicone resin, phenol resin, acrylic resin, epoxy resin, butyral resin, urethane resin, melamine resin and urea resin. 5 to 20 parts by weight of the liquid is sprayed with a repairing material which is mixed with water to have a heat insulating effect and a gas leakage or invasion preventing effect. It relates to the repair method of use equipment.

An example of a spraying device for spraying the repair material having the above structure will be described with reference to FIG. 1. Rock wool disentangled in the spraying device 2 is supplied from 1 to 11, and the rock wool disintegrator 10 is used. Further, the fibers are loosened, and the compressed air from the rock wool blower 3 passes through the rock wool transport hose 9 and is sprayed from the spray nozzle 8. The other three components of the repair material, that is, cement, water, and the resin dispersion liquid, are mixed in the cement slurry mixing tank 5 at a predetermined ratio, and uniformly mixed by the agitator 6 in the cement slurry mixing tank. It The uniformly mixed mixed slurry of cement and resin passes through the slurry transport hose 12 by the slurry pump 4, wets and mixes rock wool at the tip of the spray nozzle 8, and is sprayed on the object. In this case, the mixing ratio of the rock wool and the mixed slurry is adjusted by the cement slurry hand valve 7.

As described above, the repair material used in the present invention comprises rock wool, cement, resin dispersion liquid and water.
The blending ratio of each of these components is as shown in Table 1. In this case, an appropriate amount of water is about twice the amount of cement.

[Table 1]

For example, the performance of a repair material composed of 20% by weight of rock wool, 25% by weight of cement, 5% by weight of a phenol resin dispersion liquid (concentration 40%) and 50% by weight of water is as follows: adhesion to an iron plate: 150 g / cm ² Bulk specific gravity 0.4 Thermal conductivity 0.042 kcal / mh ° C.

As described above, in the present invention, 20 to 70 parts by weight of rock wool used as the first component, 20 to 60 parts by weight of cement as the second component, and 5 to 20 parts by weight of the resin dispersion as the third component. , And water are mixed to form a repair material. If the blending ratio of the first component, rockwool, is increased, the heat insulation performance is improved, but the strength is reduced. Cement as the second component increases adhesive strength and strength as the blending ratio increases, but cracks easily occur. Furthermore, if the amount of the resin dispersion is less than 5 parts by weight, water resistance, weather resistance and adhesiveness will be deteriorated, and if it is more than 20 parts by weight, the economical efficiency will be deteriorated and the strength will be decreased. This resin dispersion can be used as vinyl acetate resin, silicone resin, phenol resin, acrylic resin, epoxy resin, butyral resin,
One or more of urethane resin, melamine resin, urea resin and the like can be appropriately selected and used as a 20 to 50% concentration resin dispersion liquid. However, in consideration (emphasis) of heat resistance, weather resistance and the like, silicone is particularly preferable. Resin, epoxy resin,
It is desirable to use phenol resin. The water to be added may be such that the cement slurry has an appropriate fluidity.

[0009] In short, the repair material, which is a mixture of rock wool, cement, resin dispersion liquid and water, is sprayed onto the outer wall surfaces of various industrial furnaces in operation and shutdown and the outer wall surfaces of various dust collectors by a spraying device. According to the present invention, according to the present invention, the first component is a repairing method for an outer wall or the like of the above-mentioned facility, which is characterized by forming a heat insulation / gas leakage or intrusion prevention layer having a uniform coating thickness by A repair coating formed on a damaged part by spraying a repair material in which a certain amount of rock wool, a second component of cement and a third component of resin dispersion are mixed to have a predetermined coating thickness. The rock wool improves the strength and heat insulation of the repair coating and prevents cracks, the cement strengthens the adhesive strength, the resin (dispersion liquid) improves the water resistance and weather resistance, and the adhesion to the damaged part Was strengthened, become more dense film, it is possible to completely block the leakage or intrusion of gas. Spraying is usually performed so that the coating thickness is 10 to 100 mm.

Further, if the hole or the like in the damaged outer wall is large, a supplementary reinforcement material called so-called "Ategi" is attached before the repair material is sprayed, the hole is closed, and then the repair material is sprayed. It is possible to reduce the amount of material used and increase the strength of the repaired portion. The reinforcing material may be one having high strength and airtightness (a function of preventing gas leakage) such as an iron plate, for example, a mesh material (so-called lathami). However, if the repair material can adhere to form a plate-like layer, the strength cannot be expected to be enhanced, but the repair material of the present invention can impart sufficient strength and a sufficient gas leakage prevention function. . Furthermore, after the repair material of the present invention is sprayed, a resin emulsion is sprayed on the repair material to form a double structure, so that repair with complete airtightness and sufficient weather resistance is performed.

[0011]

EXAMPLE The repair materials of Examples 1 to 4 and Comparative Examples 1 to 2 below were sprayed onto the blocks 21 to 25 on the side wall (gas suction side inclined surface) of the electrostatic precipitator shown in FIG. It sprayed using the apparatus and the operating conditions shown in Table 2. In the figure,
The shaded portion indicates a broken hole, and a repair material was sprayed on the broken hole of the blocks 23 and 24 with a reinforcing steel piece interposed.

[0012]

[Table 2]

<Example 1 (spraying on block 21)> Rockwool 55% by weight, Portland cement 37% by weight, 40% acrylic resin dispersion 13% by weight, Portland cement 37% by weight and 40% acrylic resin. 13% by weight of the dispersion liquid was added to twice the weight of Portland cement and kneaded with a mixer to prepare a repair material slurry. The adjusted repair material slurry is conveyed in the conduit by a pump, while rock wool is defibrated by a spraying device,
The inside of the conduit was conveyed by air, mixed at the tip of the nozzle, and the outer wall of the dust collector was sprayed and repaired. The obtained product had a dry bulk specific gravity of 0.36 and a coating thickness of 40 mm.

<Example 2 (Spraying on Block 22)> The same repairing method as in Example 1 was carried out at a compounding ratio of 40% by weight of rock wool, 40% by weight of Portland cement and 20% by weight of 40% urethane resin. The obtained molded product had a dry bulk specific gravity of 0.38 and a coating thickness of 30 mm.

<Example 3 (Spraying on Block 23)> The same repairing method as in Example 1 was carried out with the compounding ratios of 65% by weight of rock wool, 25% by weight of Portland cement and 10% by weight of 30% epoxy resin. The obtained product had a dry bulk specific gravity of 0.30 and a coating thickness of 55 mm.

<Example 4 (spraying on block 24)> Rockwool 30% by weight, acid resistant cement 55% by weight, 30%
The same repairing method as in Example 1 was performed with a blending ratio of 15% by weight of phenol resin. The obtained molded product had a dry bulk specific gravity of 0.39 and a coating thickness of 30 mm.

<Comparative Example 1 (spraying on block 25)> Rockwool 60% by weight, Portland cement 40% by weight
In a mixing ratio of 2, the water was added twice as much as the weight of Portland cement, and the mixture was kneaded with a mixer to prepare a slurry. The adjusted slurry is pumped through the conduit, while rock wool is sprayed with a spraying device and then air is transported through the conduit.
The mixture was mixed at the tip of the nozzle, and the outer wall of the dust collector was sprayed and repaired. The obtained molded product had a dry bulk specific gravity of 0.33 and a coating thickness of 35 mm.

Comparative Example 2 (Construction on Block 26) An iron plate was placed on the block 26 and the edges were welded.

<Result Judgment> After 4 months, the presence or absence of a change in appearance and the presence or absence of gas leakage were judged by visual observation. The results are shown in Table 3.

[0020]

[Table 3]

<< Result Judgment >> After 4 months, the presence or absence of a change in appearance and the presence or absence of gas leakage were judged by visual observation. As a result, there was no change in appearance and there was no gas leakage.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-mentioned embodiments, and may be carried out in any manner as long as the configuration described in the claims is not changed. You can

[0023]

As described above, according to the repairing method of the present invention, the construction period can be shortened and the construction cost can be reduced as compared with the conventional iron plate welding. Especially, even if the equipment is large, the cost is low and the construction cost is high. Moreover, the work can be easily performed. In addition, since the prevention of gas leakage, which is a drawback of the conventional spraying method that does not contain a resin emulsion, is solved by this method, it suppresses the scattering of dust with an electric dust collector, etc., and suppresses the dissipation of heat quantity with a boiler, etc. It can be applied to a wide range of applications and has extremely high practical value.

[Brief description of drawings]

FIG. 1 is a side sectional view schematically showing an example of a spraying device for spraying a repair material.

2 (a) is a front view, FIG. 2 (b) is a plan view, and FIG. 2 (c) is a gas intake side, showing the position of the gas suction side inclined surface of the electrostatic precipitator of the sintering facility used as the damaged portion to be repaired in Example 1. It is a front view of an inclined surface.

[Explanation of symbols]

 1 Rockwool supply device 2 Spraying machine 3 Rockwool blower 4 Slurry pump 5 Slurry mixing tank 6 Slurry agitator 7 Slurry hand valve 8 Spray nozzle 9 Rockwool transport hose 10 Rockwool defibrator 12 Cement Slurry transfer hose 21-26 block

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshikatsu Kaji 3-26-8 Hatchobori, Chuo-ku, Tokyo Inside the Slugwool Industrial Co., Ltd. Tokyo branch (72) Masami Kawashima, 42-11 Sakaemachi, Chuo-ku, Chiba, Japan No. Taiho Industry Co., Ltd. Chiba Sales Office

Claims (1)

[Claims] 1. A spraying device is provided on the outer wall surface of various industrial furnaces that are operating or stopped, and the outer wall surfaces of various dust collectors, etc.
20-70 parts by weight of rock wool, and (2) cement 20
To 60 parts by weight and (3) 5 to 20 parts by weight of one or more resin dispersion liquids selected from vinyl acetate resin, silicone resin, phenol resin, acrylic resin, epoxy resin, butyral resin, urethane resin, melamine resin and urea resin. Is sprayed with a repairing material that is mixed with water so as to have a heat insulating effect and a gas leakage or invasion preventing effect, and a repairing method for industrial equipment.