JP2528777Y2 - Heat insulation structure intermediate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a structure for heat insulation of mechanical structural members of a steel furnace, particularly a heating furnace and a heat treatment furnace.

[Conventional technology]

Generally, a steel beam heating furnace is provided with a walking beam device for transporting a steel material. This device is heavy (heat piece)
In order to transport the water, it is made of a steel pipe structure, in which water is cooled by flowing water as a cooling medium. However, this alone raises the surface of the pipe to 300 to 500 ° C., causing a decrease in strength. For this reason, it is common practice to line the surface of long skid pipes and support pipes with fire-resistant insulation. Lining materials include castable, plastic, and ceramic fibers.
-13873, 57-6526, 57-20598, Tokubo 57-3728
No.), the service life is as small as about 3 years. Castables and plastics may crack or fall off due to temperature differences between the inner and outer surfaces, rapid heating of the furnace, thermal shock due to rapid cooling, oxidation and expansion of the studs, and the like.

Also, a method is known in which a semi-kneaded composite in which a binder made of colloidal alumina or silica sol is mixed with a main material made of ceramic fiber and alumina aggregate is patched on a support pipe provided with studs, and then heated and cured. Have been. However, after the construction of the composite, due to the meandering test of the long skid pipe, when operating the skid pipe at room temperature, cracks due to vibration, etc.
There was a problem that troubles such as dropouts occurred one after another.

These repair costs and production hindrance due to furnace shutdown are enormous, and there has been a demand for improved durability, especially before heat curing.

[Problems to be solved by the invention]

The present invention is intended to solve the above-mentioned technical problems, and aims to greatly extend the life of skid pipes and support pipes.

[Means for solving the problem]

In other words, the present invention is based on the addition of inorganic fibers such as ceramic fibers and inorganic aggregates such as alumina powder to a long skid pipe or a support pipe, and a semi-pulverized plastic amorphous refractory containing a binder such as colloidal silica (hereinafter referred to as a refractory). , An amorphous refractory), a coating material layer and a cloth layer. By heating and curing the intermediate of the refractory structure, a refractory and heat-insulating structure is obtained.

 Hereinafter, the present invention will be described with reference to the drawings.

In the figure, 1 is a long skid pipe, 2 is a support pipe, 3 is a stud, 4 is an amorphous refractory layer, 5 is a coating material layer, and 6 is a cloth layer.

A stud 3 is provided on a pipe such as a long skid pipe and a support pipe, and an irregular refractory layer 4 is provided so as to be supported by the stud 3.

Amorphous refractories are composed of 5 to 40% by weight, preferably 10 to 20% by weight, of inorganic fibers such as ceramic fibers, 10 to 40% by weight, preferably 20 to 40% by weight of inorganic aggregates such as alumina powder, colloidal silica, and alumina sol. Inorganic binder, CM
20 to 60% by weight of water, preferably organic binder such as C and PVA
It is kneaded with 40 to 50% by weight and has plasticity. When the content of the inorganic fiber is less than 5% by weight, not only the heat resistance is reduced, but also the moldability is reduced, and it becomes difficult to apply the inorganic fiber to a pipe. If it is too large, not only does workability deteriorate, but also material costs increase. When the amount of the inorganic aggregate exceeds 40% by weight, not only the moldability is reduced, but also the strength is reduced and peeling or the like is liable to occur. Inorganic binders are needed to cure and provide strength, while organic binders help provide strength before curing. Water must be in the above range to provide appropriate plasticity, ie, workability. This amorphous refractory hardens when dried.

A coating material layer 5 is provided on the outer periphery of the amorphous refractory layer 4. The coating material is inorganic fiber 3 such as ceramic fiber.
20% to 70% by weight, preferably 40 to 65% by weight of inorganic aggregates such as alumina powder and clay, and 20 to 70% by weight of a binder such as colloidal silica, alumina sol, PVA and CMC. %, Preferably 30 to 60% by weight, and has fluidity. Inorganic fibers are necessary to increase the strength, but if the amount is more than 3% by weight, the fluidity decreases, and application becomes difficult. The inorganic aggregate is desirably added in as large an amount as possible in order to enhance the fire resistance. However, if added in an excessive amount, not only the fluidity but also the strength is reduced, so that the inorganic aggregate is used in the above range. The binder is used to the extent necessary to provide strength before and after curing. Water needs to be within the above range in order to be able to employ a coating means such as spraying. And applying by application means such as spraying. It is cured by drying.

A cloth layer 6 is provided on the outer periphery of the coating material layer 5.
The cloth is an inorganic fiber cloth such as a silica fiber cloth or a glass fiber cloth, or an organic fiber cloth such as a cold gauze cloth, and may be relatively coarse and thin. The cloth layer 6 can be provided by spirally winding a ribbon-shaped material around the outer periphery of the coating material layer 5. It is necessary to maintain the shape of the amorphous refractory layer and the coating material layer as they are when drying, so that the thickness, shape, and the like of the amorphous material refractory layer and the coating material layer are maintained.

The heat insulating structure intermediate of the present invention is heated and cured, for example, heated and dried, and then heated to form a heat insulating structure. Curing occurs during drying but also during heating.

〔Example〕

After the metallic stud 3 is welded to the support pipe 2, a putty-like amorphous refractory layer 4 in which ceramic fiber 16% by weight, alumina powder 31% by weight and a binder are kneaded with water is provided on the outer periphery of the pipe to a thickness of 80 mm. A thin coating material layer 5 is formed by spraying a slurry-like coating material obtained by mixing 41% by weight of inorganic aggregate, 0.2% by weight of ceramic fiber and a binder with the coating material on the outer periphery thereof, and further, a spiral gauze tape is wound on the outer periphery thereof. The cloth layer 6 was wound to provide an intermediate body having a heat insulating structure.

No softening, deformation, separation, etc. during drying and curing were observed. After heating up to 1350 ° C, no deformation, cracking or falling off occurred for a long time despite the beam being driven by slab transfer. The cold gauze burned at about 600 ° C, and the silica cloth powdered and dropped at 1200 ° C. At the same time, the amorphous refractory sintered and became strong.

 Table 1 shows a comparison between the heat insulating structure of the present invention and the conventional method.

[Effects of the Invention] The inner layer is provided with a layer of an amorphous refractory having excellent adhesion and strength, and the outer layer is provided with a layer of a coating material having excellent fire resistance. can do. Further, since the cloth is wound around the outside, the strength before curing is high, and peeling or the like is prevented. In addition, amorphous refractories containing inorganic fibers can be completely integrated and uniformized, despite the fact that they are installed by hand in small quantities because of the packing material.
The durability was confirmed over a long period. As a result, the cooling loss was reduced by about 40% as compared with the conventional castable method, and the life was extended by about twice.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of the heat insulating structure of the present invention, and FIG. 2 is a transverse sectional view of a support pipe portion. 1: Skid pipe 2: Support pipe 4: Irregular refractory layer 5: Coating material layer 6 Cloth layer

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-118406 (JP, A) JP-A-59-47648 (JP, U) JP-A 60-172758 (JP, U) 20598 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A heating furnace long skid pipe or a support pipe, which is laminated on the outer periphery thereof, and contains 5 to 40% by weight of inorganic fiber, 10 to 40% by weight of inorganic aggregate, 20 to 60% by weight of water, and is dried. A plastic irregular-shaped refractory layer which is hardened and hardened, and an inorganic fiber 3 laminated on the outer periphery of the irregular-shaped refractory layer.
And a flowable coating material layer containing 20 to 70% by weight of inorganic aggregate, 20 to 70% by weight of water and a binder and dried and hardened, and further wound around the outer periphery of the coating material layer and laminated. A heat insulation structure intermediate, comprising: a cross layer.