JPH0618222Y2 - Insulation structure of furnace - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a heat insulating structure provided on an inner surface of a furnace wall, and particularly to a heat insulating structure suitable for being provided on a bent or curved inner surface of a furnace wall.

[Conventional technology]

Conventionally, as a heat insulating structure provided on the inner surface of the furnace wall, a blanket formed by layering a bulk of inorganic fibers, or a stack of felt, board, etc. formed by adding a binder to the bulk of inorganic fibers to form a plate shape It is used. When using these laminated heat insulating structures, usually, in places where the wind speed is high in the furnace, the outermost layer is made up of boards in consideration of wind speed resistance.

[Problems to be solved by the invention]

However, since the plate-shaped board is not flexible,
There is a problem that it is not suitable for attachment to a bent portion or a curved portion, and the heat insulating layer at the bent portion or the curved portion is not sufficiently protected. For example, FIG. 3 shows a conventional example of a heat insulating structure provided in a bent portion of a furnace wall leading from the inside of the furnace to a gas discharge path. A large number of blankets 2 are laminated on the inner surface of the furnace wall 1 and a plate is formed on the innermost surface. -Shaped boards 3A and 3B are laminated, and these blankets and plate-shaped boards are attached to the furnace wall 1 with a large number of studs 4.
It is fixed to. In this case, since the plate-like board is simply flat, it is not possible to mount the board having the integral structure from the horizontal plane to the vertical plane. As shown in the figure, the board 3A is arranged horizontally and the board 3B is arranged horizontally. Are arranged vertically, and the two are butted at the corners 5. However, in this structure, as shown in FIG. 4, the ends of the boards 3A and 3B open outward during use, exposing the inner blanket 2 and deteriorating due to the gas flow in the furnace. Occurs. In order to prevent this, as shown in FIG. 5, a fixing metal fitting 6 having a bent portion at a right angle is provided at the abutting portion of the boards 3A and 3B by using the stud 4, but in this case, Since the fixing metal fittings 6 that can withstand high temperatures are required, the cost is increased and the mounting work of the fixing metal fittings becomes complicated. Further, as shown in FIG. 6, there is a curved furnace wall portion 7 (for example, a burner block) protruding inward of the furnace in the furnace,
An insulating layer is also provided on the outer surface of which blanket 8 is laminated and fixed with studs 9. However, as shown in the figure, the outer surface of the insulating layer is curved, so a protective board cannot be mounted on it. Therefore, the blanket 8 is used in an exposed state. By the way, since the furnace wall portion 7 projects into the furnace, the flow velocity of the gas flow in this portion is high,
Therefore, the blanket 8 provided in this portion is deteriorated in a relatively short period of time and has a problem of a short life.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat insulating structure having a long life suitable for forming in a bent portion or a curved portion of a furnace wall.

[Means for solving problems]

That is, according to the present invention, the first heat insulating layer provided on the surface of the furnace wall and containing inorganic fibers as a main component, and the outer surface of the first heat insulating layer includes a wet layer containing inorganic fibers, a binder, inorganic powder and water as main components. A heat insulating structure for a furnace, comprising: a plate-shaped molded body attached to the plate-shaped molded body; and a board-shaped second heat insulating layer obtained by drying and curing the plate-shaped molded body.

In the present invention, the first heat insulating layer is optional as long as it has inorganic fibers as a main component, and its structure is not particularly limited. For example, inorganic fiber blankets, felts, boards, etc., alone or in an appropriate combination, laminated in parallel to the furnace wall and fixed with studs. These blankets, felts, boards, etc. are cut into strips, and the fiber direction is Examples include those that are arranged at right angles to the wall and fixed with adhesives or studs, those that fold the blanket to form blocks that are attached to the furnace wall, and those that have the same structure as the second heat insulation layer described later. . Examples of the inorganic fibers used include ceramic fibers, alumina fibers, zirconia fibers, quartz wool, rock wool, slag wool, glass wool and asbestos.

The wet plate-shaped molded product containing the inorganic fiber, the binder, the inorganic powder, and the water as the main components forming the second heat insulating layer is molded into a plate-shaped product within a range that does not completely dry and harden,
It has the property of maintaining a plate-like shape and the flexibility of being deformed according to the curvature of the mounting surface. After manufacturing, it is packed in a moisture-impermeable packaging material so that it does not dry and harden, and it is transported to the construction site. Then, it is taken out from the packaging material and mounted on the first heat insulating layer. As a result, the first heat insulating layer is deformed into a shape corresponding to the outer shape and is attached so as to cover the first heat insulating layer. After being attached, this molded body is dried in accordance with natural drying or oven drying, and is cured into a board shape. This second insulation layer is
The wet plate-shaped molded body may be composed of only one layer, or may be composed of a plurality of layers.

As the inorganic fibers used for the wet plate-shaped molded product,
For example, ceramic fiber, alumina fiber,
Zirconia fiber, quartz wool, rock wool, slag wool, glass wool, asbestos, etc. can be mentioned. From the viewpoint of fire resistance and heat resistance, ceramic fiber is most preferable. As this ceramic fiber, silica, alumina, aluminosilicate, etc. can be mentioned. Some are fibrous. These inorganic fibers may be used alone, or may be used as a mixture of two or more kinds. This inorganic fiber is contained in the solid content of the wet plate-shaped molded product in an amount of usually 40 to 90% by weight, preferably 60 to 80% by weight.

As the binder used in the wet plate-shaped molded product, there are inorganic silicate-based, alumina-based, phosphate-based inorganic binders and organic binders such as starch, with the inorganic binders being preferred. Examples of the inorganic binder include colloidal silica, colloidal alumina, colloidal zirconia, and the like. These can be used alone or as a mixture of two or more. This binder is used as an aqueous solution or a dispersion as necessary, and is usually used as a solid component in a wet plate-shaped molded product.
It is contained in the range of 10 to 10% by weight, preferably 2 to 5% by weight.

Further, examples of the inorganic powder used for the wet plate-shaped molded body include refractory clay, chamotte, mullite,
Alumina, silica, cordierite, magnesia, steatite and the like can be mentioned. These inorganic powders are
Only one of them can be used alone, or a mixture of two or more can be used. The inorganic powder is contained in the wet plate-shaped compact in an amount of usually 5 to 50% by weight, preferably 10 to 40% by weight.

The water content in the wet plate-shaped compact is usually in the range of 40 to 60% in consideration of the shape flexibility and handleability. When this water content decreases, the flexibility of the shape decreases, and conversely, when the water content increases, the water separates.

The packaging material used for hermetically sealing the wet plate-shaped molded product until it is used includes a wet plate-shaped molded product which is impermeable to moisture and sealed until it is used. Any plastic film can be used as long as it can maintain its shape and maintain its shape flexibility. Generally, a plastic bag for packaging made of a plastic film such as polyethylene, polyvinyl chloride, polyvinylidene chloride, polypropylene or polyester is used.

As a method for producing the wet plate-shaped molded body, a conventionally known method for producing a fiber molded body can be adopted. For example, the inorganic fiber, the binder, the inorganic powder, a predetermined amount of water and, if necessary, added. Organic thickeners such as carboxymethyl cellulose, methyl cellulose, starch, etc. are mixed at a predetermined ratio and mixed by a mixer etc. to prepare a slurry, and an appropriate forming means such as vacuum forming or press forming using this slurry. It is manufactured by forming a wet plate-shaped molded product by molding it into a plate-like shape by adjusting the water content to a predetermined ratio. This wet plate-shaped molded product is packed by a conventional method using, for example, a polyethylene film.

[Action]

As described above, in the heat insulating structure of the present invention, the wet plate-like molded body is arranged on the first heat insulating layer of the furnace wall and is dried and cured to form the second heat insulating layer. Even if the outer surface of the first heat insulating layer is a curved surface or a curved surface, the plate-shaped molded body deforms to a shape corresponding to it, and covers the first heat-insulating layer well, and this wet plate-shaped molded body is dry. By hardening it, it becomes a board shape, its strength becomes large, and it shows high resistance to wind pressure and wear due to the high-speed gas flow in the furnace, and it can protect the first heat insulating layer below it and prolong its life. .

〔Example〕

 An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 shows an embodiment in which the present invention is applied to a heat insulating structure of a bent portion of a furnace wall which leads from the inside of the furnace to a gas discharge passage. In this embodiment, a large number of blankets 12 are provided on the inner surface of the furnace wall 11.
Are laminated to form the first heat insulating layer, and the wet plate-shaped molded body 13 having the above-described configuration is arranged along the bent portion (horizontal surface and vertical surface) of the surface, and the studs 14 are provided on the furnace wall 11 with a large number of studs. It is fixed, and the wet plate-shaped molded body 13 is dried and cured to form a second heat insulating layer. In this embodiment, since the corner portion of the first heat insulating layer is covered with a single board 13 (made by drying and curing a wet type molded body) having high wind speed resistance and high strength, It does not deteriorate even with high-speed gas flow in the furnace, and its life is extremely long.

FIG. 2 shows an embodiment in which the present invention is applied to a heat insulating structure of a curved portion protruding into the furnace. In this embodiment, the blanket 18 is laminated along the curved furnace wall 17 protruding into the furnace to form the first heat insulating layer, and further along the curve of the surface thereof, the wet plate-shaped molded body 19 having the above-mentioned structure is formed. Is arranged and fixed to the furnace wall 17 with a large number of studs 20, and the wet plate-shaped compact 19 is dried and cured to form a second heat insulating layer. Also in this embodiment, the first heat insulating layer made of a blanket that is easily deteriorated by the high-speed gas flow has good wind speed resistance.
In addition, the structure is covered with a single board 19 having high strength (made by drying and curing a wet molded body),
It does not deteriorate even with high-speed gas flow in the furnace, and its life is extremely long.

[Effect of device]

As described above, in the heat insulating structure of the present invention, a wet plate-shaped molded body having flexibility can be attached to the outer surface of the first heat insulating layer provided on the furnace wall in conformity with the outer surface shape, and then Since it is dried and cured into a board shape, even if the outer shape of the first heat insulating layer is bent or curved, the board can be arranged on the surface according to the shape very easily and promptly. It has the effects of being easy to construct and having an extremely long life.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing another embodiment of the present invention, FIG. 3 is a sectional view showing an example of a conventional heat insulating structure, and FIG. Is a partial cross-sectional view for explaining the drawback, FIG. 5 is a cross-sectional view showing a method for solving the drawback, and FIG. 6 is a cross-sectional view showing another example of the conventional heat insulating structure. 11, 17 ...... Furnace wall 12, 18 ...... Blanket (first heat insulation layer) 13, 19 ...... Wet plate shaped body (second heat insulation layer) 14, 20 stud

Claims (3)

[Scope of utility model registration request] 1. A first heat insulating layer containing inorganic fibers as a main component, which is provided on the surface of a furnace wall, and a wet state containing inorganic fibers, a binder, inorganic powder and water as main components on the outer surface of the first heat insulating layer. A heat insulating structure for a furnace, comprising: a plate-shaped molded body, and a board-shaped second heat insulating layer obtained by drying and curing the plate-shaped molded body. 2. The heat insulating structure for a furnace according to claim 1, wherein the inorganic fibers constituting the wet plate-shaped molded body are ceramic fibers. 3. The heat insulating structure for a furnace according to claim 1, wherein the first heat insulating layer is composed of a blanket of inorganic fibers.