JPH11141852A - Smoke control duct and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a smoke control duct, which is excellent in the corrosiveness at high temperatures, the high frequency vibration by wind pressure, mechanical strength, heat insulating properties, etc., and its manufacturing method. SOLUTION: A smoke control duct is constructed by assembling sandwich plates 8a and 8b, both of which are equipped with a core material comprising a foamed matter 5 and surface materials 4, 4 which are formed on both surfaces of the core material and comprise fiber reinforced plastics, in such a manner that the surface materials 4, 4 become the inside and outside of the smoke control duct. Each sandwich plate is adhesively joined together from the inside of the smoke control duct by an overlay part 15 comprising the fiber reinforced plastics. Moreover, the sandwich plates 8a, in which the projected flange is formed at the surface material 4, are assembled to form the smoke control duct. Further, the sandwich plates 8b, in which a rib with a larger rigidity than the foamed matter 5 is formed between the foamed matters 5, are assembled to form the smoke control duct. In the method of manufacturing the smoke control duct, the glass fiber cloth which is impregnated with a thermosetting resin is arranged inside the smoke control duct, so as to cure the thermosetting resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flue gas duct for a boiler or the like and a method for producing the same, and more particularly to a flue gas having heat resistance and corrosion resistance sufficiently practical to induce high-temperature and corrosive flue gas from a boiler. The present invention relates to a smoke duct and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional smoke exhaust duct has a structure in which a thin plate made of carbon steel is reinforced by ribs, an inner surface in contact with the smoke exhaust is subjected to a flare lining treatment, and an outer surface is provided with a layer made of a foam for heat insulation. Had a structure.

[0003]

The flue gas duct having the above-mentioned structure requires periodic lining repair because of the long-term corrosion of carbon steel. Further, the flue gas duct used for a large boiler such as a power plant has a cross section of several meters in size. In the conventional structure in which a thin plate is rib-reinforced on such a large duct, chatter vibration is generated due to a wind load, so that it is necessary to provide more reinforcement than necessary. Therefore, the weight tends to be large, and the basic structure supporting the duct tends to be large. Exhaust gas from a boiler or the like contains a large amount of water vapor, sulfide (SOx), nitride (NOx), active ions, and the like. In order to prevent this condensation, it is necessary to keep the temperature of the duct wall at the same level as that of the smoke exhaust, and it is necessary to cover the outer periphery of the duct with a foam having the required thickness. It was hanging.

It is an object of the present invention to provide a smoke exhaust duct excellent in such corrosiveness at high temperature, chatter vibration due to wind load, and mechanical strength, and a method of manufacturing the same.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to remove a sandwich plate provided with a core material made of foam and a face material laminated on both sides of the core material and made of fiber-reinforced plastic. In the smoke exhaust duct assembled inside and outside the smoke duct.

[0006]

1 and 4 are views showing an example of a smoke exhaust duct according to the present invention, and FIG. 1 shows a state in which the smoke exhaust duct is being assembled. As shown in FIGS. 1 and 4, the smoke exhaust duct of the present invention includes a core member made of foam 5 and face members 4 made of fiber-reinforced plastic laminated on both sides of the core member. This is a smoke exhaust duct in which the sandwich plates 8a and 8b are assembled such that the face materials 4, 4 are inside and outside the smoke exhaust duct.

[0007] The core material constituting the sandwich plate is made of a material having heat resistance, corrosion resistance at high temperatures, and excellent heat insulation. Contains air as core material and specific gravity is about 0.01
If a material having a thickness of 0.3 to 0.3, preferably 0.02 to 0.05 is used, a smoke exhaust duct having excellent heat retention can be obtained. A material suitable for the core material is a thermosetting resin foam having the above specific gravity. Examples of the thermosetting resin include a phenol resin, a vinyl ester resin, and an unsaturated polyester resin. If a phenolic resin foam is used as the core material, practical durability, flame retardancy, and heat retention in a high-temperature corrosive atmosphere required for the flue gas duct can be easily obtained, and heat for forming the face material 4 can be obtained. The curable resin can easily adhere to the face material 4.

The face material 4 laminated on both sides of the core material is made of fiber reinforced plastic. The fiber-reinforced plastic is obtained by reinforcing a resin serving as a matrix using reinforcing fibers such as carbon fiber, glass fiber, and aramid fiber. When the above-mentioned thermosetting resin is used as the matrix resin, a smoke exhaust duct having high temperature and corrosion resistance can be obtained. Phenolic resins are preferred as matrix resins.

A sandwich plate can be manufactured by forming a layer in which a thermosetting resin such as a phenolic resin solution is impregnated into reinforcing fibers on both surfaces of a core material, and then curing the resin.

The face material 4 may be composed of a single layer of fiber-reinforced plastic, but is preferably a composite layer having two or more layers. As shown in FIGS. 3 and 6, a preferred configuration of the sandwich plate is a carbon fiber reinforced plastic layer 3 in which resin is reinforced with carbon fiber, on a glass fiber reinforced plastic layer 1 in which resin is reinforced with glass fiber.
Is formed on the carbon fiber reinforced plastic layer 3 and the composite layer in which the glass fiber reinforced plastic layer 1 is formed as a face material 4 on one surface, and a layer of a foam 5 is provided on the face material 4. Is formed as a core material, a glass fiber reinforced plastic layer 1 is formed on the layer of the foam 5, a carbon fiber reinforced plastic layer 3 is formed on the glass fiber reinforced plastic layer 1, and the carbon fiber reinforced A composite layer having a glass fiber reinforced plastic layer 1 formed on a plastic layer 3 is provided as a face material 4 on the other surface, and these layers are integrated with a resin. Thus, if the glass fiber reinforced plastic layer 1 is laminated on both sides of the carbon fiber reinforced plastic layer 3, a smoke exhaust duct excellent in specific strength or adhesion between the surface material and the core material can be obtained.

The sandwich plates are connected to each other in the longitudinal direction so that the face members 4, 4 are inside and outside the smoke exhaust duct, thereby forming a smoke exhaust duct. Since the smoke exhaust duct uses a sandwich plate including a core member made of foam 5 and face members 4 and 4 laminated on both surfaces of the core member and made of fiber-reinforced plastic, impact or wind pressure or operation It has practical strength and heat insulation performance against negative pressure at the time.

As shown in FIGS. 1 and 4, an example of a method of making the sandwich plates continuous in the longitudinal direction is to cover at least the inner surface of the connection part of the smoke exhaust duct with a glass fiber cloth impregnated with a thermosetting resin. Then, the thermosetting resin is cured to form an overlay portion 15 made of fiber reinforced plastic, and the sandwich plates are connected to each other. That is, a glass fiber cloth impregnated with a thermosetting resin is attached to the inside of the smoke exhaust duct, or a thermosetting resin is impregnated from above the glass fiber cloth placed inside the smoke exhaust duct, and then the thermosetting resin is impregnated. Is cured to form an overlay portion 15, the sandwich plates are adhered to each other by the overlay portion 15, and the joint is sealed. Overlay part 1
As shown in FIGS. 1 and 4, 5 may be provided around the connection portion of the sandwich plate, or may be provided not only around the connection portion but also on the entire inner surface of the smoke exhaust duct.

As shown in FIGS. 1 and 3, the use of the sandwich plate 8a in which the flange 7 to be abutted is formed integrally with the face material 4 facilitates the assembly of the smoke exhaust duct. As the flange, a flange protruding outside the face material is preferable, and the flange is preferably made of fiber reinforced plastic. When assembling the smoke exhaust duct,
The flanges 7 are butted against each other, and the butted portions are fixed using corrosion-resistant bolts such as fiber-reinforced plastic or stainless steel bolts, and the sandwich plate 8a is made continuous. In addition, since the flange 7 has a reinforcing effect, deformation of the smoke exhaust duct is prevented.

[0014] In order to obtain a smoke exhaust duct having greater strength against wind pressure and negative pressure during operation, it is preferable to further reinforce the smoke exhaust duct. An example of the reinforced smoke exhaust duct is a smoke exhaust duct in which a brace material 14 is fixed to an overlay portion 15 via a bracket 13 as shown in FIG. For such reinforcement, a bracket 13 is arranged inside the smoke exhaust duct, a glass fiber cloth impregnated with a thermosetting resin is arranged on the inner surface of the smoke exhaust duct, and then the thermosetting resin is cured to form an overlay. This can be performed by fixing the bracket 13 with the overlay portion 15. In addition, the bracket 13 is provided at the tip of the brace member 14 that acts as a hedge supporting the wall of the smoke exhaust duct from the inside, and is a member having a larger diameter than the brace member 14.
When the bracket 13 and the brace material 14 are made of fiber reinforced plastic, they have excellent corrosion resistance or specific rigidity. As shown in FIG. 2, the reinforcement is performed by disposing a bracket 13 inside the smoke exhaust duct and attaching a glass fiber cloth impregnated with a thermosetting resin around the bracket 13 or placing the fiberglass cloth around the bracket 13. It can be easily performed by impregnating a thermosetting resin from above the glass fiber cloth, then hardening the thermosetting resin, and simultaneously bonding and fixing the bracket 13 to the inner surface of the smoke exhaust duct simultaneously with the hardening of the thermosetting resin. . Examples of the glass fiber cloth include a cloth or mat of a reinforcing fiber such as a glass roving cloth and a glass chopped mat.

As another example of reinforcement, as shown in FIGS. 4 and 6, a layer having a higher rigidity, that is, a higher elastic modulus than the foam 5 is provided between the foams 5 as the ribs 6. And a method using a sandwich plate 8b. The ribs 6 are for preventing the flexible body 5 from bending and deforming.
And a face plate 4 can be provided in a lattice shape or a honeycomb shape. The ribs 6 are preferably made of fiber reinforced plastic, and such ribs 6 can be formed by covering the thick side (side surface) of the block of the foam 5 with a layer of fiber reinforced plastic.

An embodiment of the present invention will be described below. Embodiment 1 The smoke exhaust duct of this embodiment is a sandwich plate 8 shown in FIG.
It is obtained by assembling a. The smoke exhaust duct is
As shown in FIG. 1, the face plates 4 and 4 discharge a sandwich plate 8a having a core material made of a foam 5 and face plates 4 and 4 made of fiber reinforced plastic and laminated on both sides of the core material. A smoke exhaust duct assembled so as to constitute an inner surface and an outer surface of a smoke duct, wherein a plate-like flange (7) erected at an upper end of an upper surface of the surface material (4) is formed integrally with the surface material (4). 8a is a smoke exhaust duct which is fixed with the flanges 7 abutting on the flanges 7 and is continuous in the longitudinal direction,
The sandwich plates 8a are adhered and fixed to each other from the inside of the smoke exhaust duct by an overlay portion 15 made of fiber-reinforced plastic, and as shown in FIG. This is a smoke exhaust duct obtained by fixing via a bracket 13.

Embodiment 2 FIG. 4 shows a smoke exhaust duct of this embodiment. The smoke exhaust duct is
It is obtained by assembling the sandwich plate 8b shown in FIG. As shown in FIG. 4, the smoke exhaust duct has a sandwich plate 8b provided with a core member made of foam 5 and face members 4, 4 made of fiber reinforced plastic and laminated on both sides of the core member. A smoke exhaust duct assembled so that the members 4, 4 are inside and outside the smoke exhaust duct, and the sandwich plates 8b, 8b are bonded and fixed from the inside of the smoke exhaust duct by an overlay portion 15 made of fiber-reinforced plastic. In addition, a rib 6 made of a material having a higher rigidity than the foam 5 is formed between the block of the foam 5 and the block of the foam 5 to prevent the foam 5 from bending. is there. The smoke exhaust duct of the present embodiment may be provided with a flange as in the first embodiment, or may be further reinforced by providing a brace material 14 and a bracket 13 as shown in FIG. May be provided.

[0018]

The present invention will be described below with reference to examples. Example 1 The smoke exhaust duct shown in FIG. 1 was manufactured as follows. Carbon fiber cloth and glass fiber mat as reinforcing fibers [Pyrofil (registered trademark) TR, manufactured by Mitsubishi Rayon Co., Ltd.]
K910 mat] and a glass fiber chopped strand mat (# 500). As a resin, a phenol resin for hand lay-up [SHOROL (registered trademark) BRL-240, manufactured by Showa Polymer Co., Ltd.] was prepared. As a foam, a phenolic resin foam obtained by foaming a phenolic resin 30 times (specific gravity is about 0.04 and thickness 1)
00 mm).

The above-mentioned glass fiber mat (abbreviated as M),
Carbon fiber cloth (abbreviated as C), glass fiber mat, phenolic resin foam (abbreviated as F), glass fiber mat,
A carbon fiber cloth and a glass fiber mat are placed in this order on a surface plate subjected to a release treatment, and the mat and the cloth are impregnated with the phenol resin to obtain M / C / M /
A laminate having a configuration of F / M / C / M was obtained. Further, in order to form the flange 7 on the uppermost layer (layer in which the phenolic resin is impregnated in the glass fiber mat) of the laminate, the glass fiber mat is stacked to a thickness of about 20 mm. Was impregnated with a phenolic resin.

This laminate was heated in an oven at 80 ° C. for 1 hour to cure the phenol resin impregnated in the mat and cloth, and then the laminate was removed from the platen to obtain a flange as shown in FIG. 7 (interval between the flange portions in the longitudinal direction of the duct was 300 mm) to obtain a sandwich plate 8a formed integrally on one surface.

After the sandwich plate 8a is processed to a predetermined size and the like, transported to the site, the sandwich plate 8a is connected to form a duct, and a reinforcing brace material 14 and a bracket 13 are arranged in the duct, and a glass roving cloth is provided. A phenol resin impregnated on the inside of the connection portion of the sandwich plate 8a and around the bracket 13, and the phenol resin is cured at room temperature to form the overlay portion 15, thereby forming the smoke exhaust duct shown in FIG. Was assembled.
In addition, the brace material 14 was obtained by winding an IDT-shaped cross-shaped cloth around a pipe reinforced with an unsaturated polyester resin by a glass fiber mat, followed by molding by hand lay-up. As the bracket 13, a pipe formed by reinforcing an unsaturated polyester resin with a glass fiber mat and a glass fiber cloth was used. After the pipe is attached to the corner inside the duct by the overlay portion 15, the brace material 14 is assembled when the sandwich plate 8a is assembled.
Was inserted.

Example 2 A smoke exhaust duct shown in FIG. 4 was manufactured as follows. Carbon fiber cloth, glass fiber mat, glass fiber chopped strand mat, and phenol resin were prepared as in Example 1 as the reinforcing fibers and resin. The same phenol resin foam block (size of 500 mm in length and width and 100 mm in thickness) as in Example 1 was prepared as a foam. In the same manner as in Example 1, a glass fiber mat, a carbon fiber cloth, and a glass fiber mat were placed on a platen in this order, and these mats and cloths were impregnated with a phenol resin to obtain M / C / The laminated body had a configuration of M. On top of this laminate, a block of the phenolic resin foam was placed.

When a phenolic resin foam is placed on the laminate having the structure of M / C / M, as shown in FIG. One strand of the strand mat is wound, and while forming the impregnated layer 6 ′ in which the phenol resin is sufficiently impregnated on the wound chopped strand mat, a plurality of blocks of the phenol resin foam 5 are butted on the laminate. Side by side. The impregnated layer 6 ′ is for forming the rib 6.

Next, a glass fiber mat, a carbon fiber cloth, and a glass fiber mat are further placed in this order on the phenol resin foam 5 and the impregnated layer 6 'in the same manner as in Example 1, and these are impregnated with the phenol resin. To obtain a laminate.

The laminate is heated and cured in the same manner as in Example 1, and a rib 6 is formed between the foams 5 in a grid pattern.
The sandwich plate 8b shown in FIG.

A sandwich plate 8b was assembled by forming an overlay portion 15 using a glass chopped mat impregnated with a phenol resin, thereby obtaining a smoke exhaust duct having a structure shown in FIG.

[0027]

As described above, the smoke exhaust duct of the present invention has a wall structure having practical strength and heat insulation performance against wind pressure and negative pressure during operation. Therefore, heat insulation work is omitted, the corrosion resistance is excellent, and semi-permanent repair is not required, so that labor saving can be achieved, and chatter vibration due to wind is eliminated because of high rigidity over the entire surface. Furthermore, compared to the conventional duct structure in which a thin plate made of carbon steel or stainless steel is reinforced with ribs, the weight is about 1/5, which is lighter, so heavy equipment for installation work can be omitted, and the basic structure is greatly improved. Simplification is possible.
INDUSTRIAL APPLICABILITY The smoke exhaust duct of the present invention is useful as a smoke exhaust duct or the like between a boiler of a power plant and a desulfurization unit.
It is possible to manufacture a large smoke exhaust duct having a length of 0m x 10m and a length of 300m. According to the method for manufacturing a smoke exhaust duct of the present invention,
It is easy to manufacture such a smoke exhaust duct.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an example of a smoke exhaust duct of the present invention.

FIG. 2 is a diagram showing an example of a structure for reinforcing a smoke exhaust duct using a bracket and a brace material.

FIG. 3 is a cross-sectional view showing an example of a sandwich plate.

FIG. 4 is a schematic diagram illustrating another example of the smoke exhaust duct of the present invention.

FIG. 5 is a perspective view illustrating an example of a method for manufacturing a sandwich plate provided with ribs.

FIG. 6 is a cross-sectional view illustrating an example of a sandwich plate provided with ribs.

[Explanation of symbols]

1. Glass fiber reinforced plastic layer, 3. Carbon fiber reinforced plastic layer, 4. Face material, 5. Foam, 6.
.Rib, 6 '.. Impregnation layer, 7..Flange, 8a, 8b
..Sandwich plates, 13 brackets, 14 brace materials, 15 overlay portions

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiharu Numata 4-1-1 Ushikawadori, Toyohashi-shi, Aichi Prefecture

Claims (8)

[Claims] 1. A sandwich plate comprising a core material made of a foam and a face material laminated on both sides of the core material and made of fiber-reinforced plastic, so that the face material is inside and outside the smoke exhaust duct. Smoke exhaust duct to be assembled. 2. The smoke exhaust duct according to claim 1, wherein the sandwich plates are bonded from the inside of the smoke exhaust duct by an overlay portion made of fiber reinforced plastic. 3. The smoke exhaust duct according to claim 1, wherein a sandwich plate having a flange formed on a face material is assembled. 4. The smoke exhaust duct according to claim 1, wherein a sandwich plate having ribs having greater rigidity than the foam is formed between the foams. 5. The smoke exhaust duct according to claim 1, wherein the sandwich plate integrally formed with the flanges is continuous in the longitudinal direction by fixing the flanges. 6. The smoke exhaust duct according to claim 2, wherein a brace material made of fiber reinforced plastic is fixed to the overlay portion via a bracket. 7. A sandwich plate comprising a core material made of a foam and a face material laminated on both sides of the core material and made of fiber reinforced plastic, so that the face material is inside and outside the smoke exhaust duct. A method for manufacturing a smoke exhaust duct, wherein a glass fiber cloth impregnated with a thermosetting resin is disposed on the inner surface of the smoke exhaust duct, and then the thermosetting resin is cured to form an overlay portion. 8. A bracket disposed inside the smoke exhaust duct, and the bracket is fixed by an overlay portion.
A method for manufacturing the smoke exhaust duct described in the above.