JP2014062612A - Heat insulation construction method for piping facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method which improves durability by means of a simple construction and, even when being dismantled and separated from the heat insulation object portion, can facilitate the reuse.SOLUTION: A paste-like unshaped refractory material made by kneading ceramic fiber, inorganic powder and organic binder is successively stuck to the outside of the heat insulation object portion 1 of a pipe line to perform the building-up until a heat insulating layer 3 of a predetermined thickness is formed, the heat insulating layer 3 is dried, and is temporarily cured, thereafter, the heat insulation layer 3 is divided into a plurality of divided heat insulation layer members 3A, and is released from the heat insulation object portion 1, the divided heat insulation layer members 3A are respectively sintered to form divided heat insulation materials and a plurality of divided heat insulation materials are fitted to the heat insulation object portion 1 so as to cover the heat insulation object portion 1 while assembling the plurality of divided heat insulation materials.

Description

  The present invention relates to a heat insulating method for piping equipment.

  Conventionally, in piping equipment such as fluid pipes and valves, pipe joints and complicated shapes, for example, in power gas turbine combustion chambers, piping equipment where high-temperature fluid flows or piping equipment heated by heating In order to prevent burns and to insulate and heat the fluid in the pipes, heat insulation by wrapping the pipe facilities with a futon-like insulator made of fiber heat insulating material (rock wool or glass wool) and heat insulating glass cloth. (The literature cannot be shown by well-known and conventional techniques).

  In the conventional construction method described above, the futon-like heat insulating material made of the fiber heat insulating material takes time and effort to cover the heat insulating target part having a complicated shape in the piping facility, and the material itself made only of the fiber heat insulating material is, There is a problem with durability, such as loss of flexibility due to use under high temperature. For this reason, when dismantling for separation of piping facilities and separating from the place to be insulated, it becomes difficult to reuse, and must be disposed of, and a large amount of industrial waste is inevitable.

  Accordingly, an object of the present invention is to provide a construction method that solves the above-mentioned problems, increases durability with simple construction, and can be easily reused even after being disassembled and separated from the place to be insulated. .

  A first characteristic configuration of the present invention is that a paste-like amorphous refractory material kneaded with ceramic fibers, inorganic powder, and an organic binder is sequentially attached to the outside of a place to be insulated in a piping facility to have a predetermined thickness. Build up until a heat insulation layer is formed, dry the heat insulation layer, and after temporary curing, divide the heat insulation layer into a plurality of divided heat insulation layer members and release from the heat insulation target portion, the divided heat insulation layer member Each of them is fired to form a divided heat insulating material, and is mounted so as to cover a plurality of the divided heat insulating materials in combination with respect to the portion to be insulated.

According to the first characteristic configuration of the present invention, the paste-like amorphous refractory material obtained by kneading ceramic fiber, inorganic powder, and organic binder is sequentially adhered to the outside of the heat insulation target portion of the piping facility to obtain a predetermined By building up until the heat insulation layer having a thickness is formed, it is possible to easily cover and form the heat insulation layer even in the heat insulation target portion having a complicated shape in the piping facility.
Moreover, the paste-like amorphous refractory material in which ceramic fiber, inorganic powder, and organic binder are kneaded can increase heat resistance because it contains not only ceramic fiber but also inorganic powder. After the heat insulating layer formed by covering the portion to be insulated with the amorphous refractory material is dried and temporarily cured, the heat insulating layer is divided into a plurality of divided heat insulating layer members and released from the portion to be insulated, and the divided heat insulation. By firing each layer member to form a divided heat insulating material, a molded product that is strong and can be used several times can be obtained.
And if it mounts | wears with respect to the heat insulation object location so that it may cover in combination with the said some division | segmentation heat insulation, it can fit easily also to the heat insulation object location in complicated piping equipment.
Therefore, the maintenance of the piping equipment can be performed efficiently, and further, even if it is disassembled and separated from the place to be insulated, it can be easily reused, so that generation of waste and dust can be suppressed.

  According to a second characteristic configuration of the present invention, before the irregular refractory material is adhered to the outside of the heat insulation target portion of the piping facility, the heat insulation target portion is made of a polyethylene film, other resin film, or inorganic powder. Is covered with a release material made of any one of slurry-like release paints having a main material as a main material, and the amorphous refractory material is adhered to the outside of the release material.

  According to the second characteristic configuration of the present invention, an operation of simply winding a polyethylene film or other resin film on the surface of a portion to be insulated of the piping facility, or a slurry having an inorganic powder as a main material By simply applying the release coating, it is possible to form a release layer, easily remove the heat insulation layer from the place to be insulated, and improve workability in a very short time with little effort.

  The third characteristic configuration of the present invention is that the sheet-like cloth is wound around the heat insulation target portion of the piping equipment to form a covering cloth portion, and the hydraulic material adheres to the sheet-like cloth in a state where the hydraulic material is attached. The material is cured by the presence of water, and after the hydraulic material is temporarily cured, the covering cloth portion to which the hydraulic material is adhered is divided into a plurality of divided covering members and released from the heat insulation target portion, and the divided coating is performed. A paste-like amorphous refractory material kneaded with ceramic fiber, inorganic powder, and organic binder is sequentially adhered to the outside of the member, and the heat insulation layer is formed until a predetermined thickness is formed, and the heat insulation layer is dried. After the temporary curing, the divided covering member is removed from the heat insulating layer to form a divided heat insulating layer member, and the divided heat insulating layer member is fired to form a divided heat insulating material. Said division of Is to attached to cover a combination of heat thereof.

According to the third characteristic configuration of the present invention, with respect to the divided covering member obtained by dividing the covering cloth portion formed on the outside of the insulation target portion of the piping facility, the ceramic fiber, the inorganic powder, and the organic binder are provided on the outside thereof. By kneading the kneaded paste-like amorphous refractory material in sequence until it forms a heat insulation layer with a predetermined thickness, it can easily cover even heat-insulated parts with complicated shapes in piping equipment. Thus, a heat insulating layer can be formed.
Moreover, the paste-like amorphous refractory material in which ceramic fiber, inorganic powder, and organic binder are kneaded can increase heat resistance because it contains not only ceramic fiber but also inorganic powder. After the heat insulating layer formed by covering the portion to be insulated with the amorphous refractory material is dried and temporarily cured, the heat insulating layer is divided into a plurality of divided heat insulating layer members and released from the portion to be insulated, and the divided heat insulation. By firing each layer member to form a divided heat insulating material, a molded product that is strong and can be used several times can be obtained.
And if it mounts | wears with respect to the heat insulation object location so that it may cover in combination with the said some division | segmentation heat insulation, it can fit easily also to the heat insulation object location in complicated piping equipment.
Therefore, the maintenance of the piping equipment can be performed efficiently, and further, even if it is disassembled and separated from the place to be insulated, it can be easily reused, so that generation of waste and dust can be suppressed.
In addition, the split covering member forms a covering cloth portion by wrapping a sheet-like cloth around the heat insulation portion of the piping facility, and the hydraulic material is removed from the water in a state where the hydraulic material adheres to the sheet-like cloth. It can be repeatedly used as a formwork for forming a divided heat insulating layer member by forming a covering cloth portion to which a hydraulic material is adhered after being subjected to a curing reaction by the presence of the hydraulic material and by temporarily dividing the hydraulic material to form a divided heat insulating layer member. It is possible to efficiently produce a plurality of divided insulators for use in the same type of piping equipment, thereby improving the economy.

  According to a fourth feature of the present invention, before the sheet-like cloth is wound around the heat insulation target portion of the piping facility, the heat insulation target portion is mainly made of polyethylene film, other resin film, or inorganic powder. The material is covered with a release material made of any of the slurry-like release paints used as a material, and the sheet-like cloth is wound around the outside of the release material.

  According to the 4th characteristic structure of this invention, it is the operation | work which only winds the polyethylene film and other resin film on the surface with respect to the heat insulation object location of piping equipment, or the slurry form which uses inorganic powder as a main material By simply applying the release paint, it is possible to form a release layer, easily remove the split covering member from the place to be insulated, and improve workability in a very short time with little effort. .

  According to a fifth characteristic configuration of the present invention, the sheet-like cloth uses a material in which the hydraulic material is applied in advance before the covering cloth portion is formed, and the covering cloth portion is formed after the covering cloth portion is formed. The water is impregnated with water.

According to the fifth characteristic configuration of the present invention, the sheet-like cloth coated with the hydraulic material in advance before forming the covering cloth portion is wound around the outside of the insulation target portion of the piping facility, and then the outer periphery thereof. It hardens | cures only by apply | coating water to a surface, and a division | segmentation coating | coated member can be rapidly released from the location for heat insulation.
Therefore, it is possible to insulate the piping facility in a short time.

  A sixth characteristic configuration of the present invention is that the ceramic fiber is an alumina-silica ceramic fiber.

  According to the sixth characteristic configuration of the present invention, heat resistance can be improved by using an alumina / silica ceramic fiber.

  The seventh characteristic configuration of the present invention is that the room temperature curable refractory material obtained by mixing the inorganic powder and the aqueous resin emulsion after firing the divided heat insulating layer member is used as the outer peripheral surface or inner peripheral surface of the divided heat insulating material. It is in the place applied to at least one of the.

  According to the seventh characteristic configuration of the present invention, the room temperature curable refractory material obtained by mixing the inorganic powder and the aqueous resin emulsion applied to the outer peripheral surface of the divided heat insulating material after firing the divided heat insulating layer member is Is hardened to form a hard protective coating layer. For this reason, the strength of the divided insulation can be increased in a short time, and the insulation target location of the piping equipment can be protected in a short time.

  The eighth characteristic configuration of the present invention is that the room temperature curable refractory material in which the inorganic powder and the aqueous resin emulsion are mixed before firing the divided heat insulating layer member is used as the outer peripheral surface or the inner surface of the divided heat insulating layer member. It is in a place where it is applied to at least one of the peripheral surfaces.

  According to the 8th characteristic structure of this invention, the inorganic powder and aqueous resin emulsion which are apply | coated to at least one of the outer peripheral surface or inner peripheral surface of a division | segmentation heat insulation layer member are mixed before baking of a division | segmentation heat insulation layer member. Room temperature curable refractory material sinters inorganic powder after firing to form a hard protective coating layer, which further increases the strength of the entire segmented insulation and increases the number of reuses after maintenance of piping equipment. It is done.

  According to a ninth characteristic configuration of the present invention, the aqueous resin emulsion is an acrylic resin emulsion.

  According to the ninth feature of the present invention, the room temperature curable refractory material in which the acrylic resin emulsion and the inorganic powder are mixed does not use an organic solvent and is safe in handling and cured at room temperature after application. Good workability.

It is a perspective view which shows the state which formed the heat insulation layer in the outer side of a mold release material, (a) is a partially cutaway perspective view, (b) is a whole perspective view. (A) The perspective view which divided | segmented the heat insulation layer into the division | segmentation heat insulation layer member, (b) It is the disassembled perspective view which released the division | segmentation heat insulation layer member from the heat insulation object location. (A) The image figure of the division | segmentation heat insulation layer member at the time of baking, (b) The perspective view which apply | coated the room temperature curable refractory material to the division | segmentation heat insulation layer member after baking. (A) is a perspective view before an assembly | attachment with respect to the heat insulation object location, (b) is a perspective view after an assembly | attachment. It is a perspective view of another embodiment, (a) is a state before covering a heat insulation object part with a mold release material, (b) is a state covered with a mold release material. It is a perspective view of another embodiment, (a) shows a state when a polyethylene sheet is wound around the outside of the release material, and (b) shows a state where a sheet-like cloth is wound around the outside. It is a perspective view of another embodiment, (a) shows the state which brushes water on the peripheral surface of a covering cloth part, and (b) shows the state where cut was formed in the covering cloth part. In the perspective view of another embodiment, the state which isolate | separates a mold release material from a division | segmentation coating | coated member is shown. In the perspective view of another embodiment, the state which forms a heat insulation layer is shown. It is a perspective view of another embodiment, and shows the state where a division covering member is separated from a division heat insulation layer member. It is an image figure of the division | segmentation heat insulation layer member at the time of baking. It is the perspective view which apply | coated the room temperature-hardening refractory material to the division | segmentation heat insulation layer member after baking.

[First Embodiment]
Embodiments of the present invention will be described below with reference to the drawings.
In a gas turbine combustion chamber for electric power as an example, in a piping facility in which a high-temperature fluid flows, a procedure for protecting with a heat insulating material for a place where heat insulation such as piping or a valve or a burn due to contact is targeted is illustrated in FIGS. Next, as shown in FIG.
1. The heat insulation object location 1 of the piping facility is covered with a release material 2 formed of a polyethylene film.
2. Contains alumina / silica (Al ₂ O ₃ , SiO ₂ ) ceramic fiber, inorganic powder such as amorphous silica, colloidal silica (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and organic binder The paste-like amorphous refractory material obtained by wet-kneading the material by adding water is sequentially attached to the outside of the release material 2 covering the heat insulation target portion 1 of the pipe until the heat insulation layer 3 having a predetermined thickness is formed. (Fig. 1 (a), (b)).
3. The inorganic powder and the organic binder are temporarily cured by heating and drying the heat insulating layer 3 by irradiation with near infrared rays. After the temporary curing, the heat insulating layer 3 is divided into a plurality of divided heat insulating layer members 3A. The mold is released from the location 1 to be insulated (FIG. 2 (a) → FIG. 2 (b)).
4. The divided heat insulating layer member 3A is fired at 700 ° C. to 800 ° C. to form the divided heat insulating material 4 (FIG. 3A).
5. On the outer peripheral surface of the divided heat insulator 4, an inorganic powder made of aluminum hydroxide (Al (OH) ₃ ), silica (SiO ₂ ) or other inorganic filler and an aqueous resin emulsion made of acrylic resin are mixed. A room temperature curable refractory material 5 (generally referred to as a refractory putty) is applied (FIG. 3B).
6. After the room temperature curable refractory material 5 is cured, the heat insulation target portion 1 is mounted so as to cover a plurality of the divided heat insulating materials 4 in combination (FIG. 4 (a) → FIG. 4 (b)).

[Second Embodiment]
The procedure of the second embodiment is shown in FIGS.
1. The insulation target location 1 of the piping facility is covered with a release material 2 formed of a polyethylene film (FIG. 5 (a) → (b)) (Note that the release material 2 may be unnecessary).
2. A sponge-like polyethylene sheet 6 is wound on the outside of the release material 2 covering the heat insulation target portion 1 of the pipe in order to secure the thickness of the room temperature curable refractory material 5 to be applied later (FIG. 6A). ). In addition, when the room temperature curable refractory material 5 is not applied to the inner peripheral surface of the divided heat insulating material 4, the sponge-like polyethylene sheet 6 does not need to be wound around the outside of the release material 2.
3. A sheet-like cloth 7 made of glass fiber pre-impregnated with a water-curable polyurethane resin (hydraulic material) is wound around the polyethylene sheet 6 to form a covered cloth portion 8 (FIG. 6B). .
4). Water is applied to the outer peripheral surface of the covering cloth portion 8 with a brush to wait for the sheet-like cloth 7 to undergo a curing reaction (FIG. 7A).
5. After temporary curing of the covering cloth part 8, a notch 9 is made with a cutter, and the covering cloth part 8 is divided into a plurality of divided covering members 10 and released from the place 1 to be insulated (FIG. 7 (b) → FIG. 8). .
6). A paste-like amorphous refractory material kneaded with ceramic fibers, inorganic powder, and organic binder is sequentially adhered to the outside of each of the divided covering members 10 until the heat insulating layer 3 having a predetermined thickness is formed. (Figure 9).
7). After the heat insulating layer 3 is dried and temporarily cured, the divided covering member 10 is removed from the heat insulating layer 3 to form a divided heat insulating layer member 3A (FIG. 10).
8). The divided heat insulation layer members 3A are fired in a firing furnace to form the divided heat insulation 4 (FIG. 11).
9. A room temperature curable refractory material 5 is applied to the inner peripheral surface and the outer peripheral surface of the divided heat insulator 4 (FIG. 12).
10. It mounts | wears with respect to the said heat insulation object location 1 so that the some division | segmentation heat insulation 4 may be combined and covered.

[Another embodiment]
Other embodiments will be described below.
<1> The mold release material 2 shown in FIG. 1 (a) and FIG. 5 (b) may use a polyolefin-based resin film such as polypropylene or other resin film in addition to the polyethylene film, You may apply | coat to the heat insulation object location 1 using the slurry-like mold release coating which uses inorganic powder as a main material. In this case, it is easy to apply to the heat insulation target location 1 of the piping facility having a complicated shape. Further, when the amorphous refractory material can be easily removed from the place to be insulated, the attaching work of the release material 2 may be omitted.
<2> In order to increase the thickness of the heat insulating layer 3, an amorphous refractory material may be further added to the outer surface of the divided insulating layer member 3A divided before firing. The appearance can be improved to improve the appearance. In addition, before dividing into the divided heat insulating layer member 3A, several steps are performed in which an amorphous refractory material is further thickened on the outer surface of the heat-dried heat insulating material layer, and the surface is again heat-dried by irradiation with near infrared rays. The thickness may be increased repeatedly.
<3> The above-described piping facility is exemplified by the piping facility in the power gas turbine combustion chamber. However, the piping facility may be a complex target portion to be thermally insulated in another high-temperature fluid piping facility or a low-temperature fluid piping facility. .
<4> The room temperature curable refractory material 5 may be applied to the outer peripheral surface of the divided heat insulating layer member 3A before firing the divided heat insulating layer member 3A. In this case, the room temperature curable refractory material 5 is stronger. It hardens | cures and protects the division | segmentation heat insulating material 4 whole firmly. Moreover, what is necessary is just to apply | coat to at least one of the outer peripheral surface and inner peripheral surface with respect to 3A of division | segmentation heat insulation layer members.
<5> To form the heat insulating layer 3 having a predetermined thickness by adhering the amorphous refractory material to the insulation target portion 1 of the pipe, a lump of dumped amorphous refractory material is simply formed outside the release material 2. In order to arrange the thickness of the heat-insulating layer 3 and adjust the outer shape, a semi-cylindrical mold is placed outside the target location such as a pipe, and the space between the mold and the target location is arranged. After the amorphous refractory material is cast and the cast amorphous refractory material is dried and cured, the heat insulating layer 3 may be removed from the mold to form the divided heat insulating layer member 3A.
<6> On the outside of the heat insulating layer 3 formed of the irregular refractory material, a high-performance heat insulating layer is further formed by a vacuum heat insulating material or an airgel containing amorphous silica as a raw material to further increase the heat insulating property. May be.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

1 Insulation target area
2 Release material 3 Heat insulation layer 3A Divided heat insulation layer member 4 Divided heat insulation 5 Room temperature curable refractory material 7 Sheet-like cloth 8 Cover cloth part 10 Divided covering member

Claims (9)

The paste-like amorphous refractory material in which ceramic fiber, inorganic powder and organic binder are kneaded is sequentially deposited on the outside of the insulation target part of the piping equipment until a heat insulation layer of a predetermined thickness is formed,
After drying and heat-curing the heat-insulating layer, the heat-insulating layer is divided into a plurality of heat-insulating layer members and released from the heat-insulating target location,
Each of the divided heat insulating layer members is fired to form a divided heat insulating material,
A heat insulating method for piping equipment that is mounted so as to cover a plurality of the divided heat insulating materials in combination with respect to the heat insulation target portion.   Before adhering the irregular refractory material to the outside of the heat insulation target portion of the piping facility, the heat insulation target portion is made of a polyethylene film, other resin film, or a slurry-like mold release mainly composed of inorganic powder. The heat insulation method for piping equipment according to claim 1, wherein the heat insulating material is covered with a release material made of any of the paints, and the irregular refractory material is adhered to the outside of the release material. Forming a covered cloth portion by winding a sheet-like cloth on the outside of the heat insulation target portion of the piping facility, in a state where the hydraulic material adheres to the sheet-like cloth, the hydraulic material is cured and reacted in the presence of water,
After the temporary curing of the hydraulic material, the coated fabric portion to which the hydraulic material is adhered is divided into a plurality of divided coating members and released from the heat insulation target location,
On the outside of the divided covering member, the paste-like amorphous refractory material kneaded with ceramic fiber, inorganic powder and organic binder is sequentially attached to build up a heat insulation layer of a predetermined thickness,
After the thermal insulation layer is dried and temporarily cured, the divided covering member is removed from the thermal insulation layer to form a divided thermal insulation layer member,
Each of the divided heat insulating layer members is fired to form a divided heat insulating material,
A heat insulating method for piping equipment that is mounted so as to cover a plurality of the divided heat insulating materials in combination with respect to the heat insulation target portion.   Before wrapping the sheet-like cloth around the heat insulation target portion of the piping facility, the heat insulation target portion is made of a polyethylene film, other resin film, or a slurry-like release paint mainly composed of inorganic powder. The heat insulation method for piping equipment according to claim 3, wherein the sheet-shaped cloth is covered with a release material made of any of the above, and the sheet-like cloth is wound around the release material. The sheet-like cloth uses a material to which the hydraulic material is applied in advance before forming the covering cloth portion,
The heat insulation method for piping equipment according to claim 3 or 4, wherein after the covering cloth portion is formed, the covering cloth portion is impregnated with water.   The heat insulation method for piping equipment according to any one of claims 1 to 5, wherein the ceramic fiber is an alumina-silica ceramic fiber.   The room temperature curable refractory material in which the inorganic powder and the aqueous resin emulsion are mixed is applied to at least one of the outer peripheral surface or the inner peripheral surface of the divided heat insulating material after firing the divided heat insulating layer member. The heat insulation construction method for piping equipment according to any one of 6.   The room temperature curable refractory material in which an inorganic powder and an aqueous resin emulsion are mixed is applied to at least one of an outer peripheral surface or an inner peripheral surface of the divided heat insulating layer member before firing the divided heat insulating layer member. The heat insulation construction method for piping equipment according to any one of 1 to 6.   The heat insulation method for piping equipment according to claim 7 or 8, wherein the aqueous resin emulsion is an acrylic resin emulsion.

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