JP6695736B2 - Insulation and its construction method - Google Patents

Description

  The present invention relates to a heat insulating material for heat insulating curved equipment (industrial furnace, lid, piping, etc.) in which a plurality of accessory members are attached to a curved inner peripheral surface, and a construction method thereof.

In many industrial furnaces and their lids or pipes, a heat insulating material is used for the purpose of energy saving, CO ₂ reduction, protection of the backside iron shell, etc. (for example, Patent Document 1). Among these facilities, the inner peripheral surface is curved, and multiple (many) accessory members such as studs, thermocouple pipes, heater pipes, cooling pipes, and gas pipes are arranged on the inner peripheral surface. There is also equipment that is used (in this specification, such equipment is referred to as "curved surface equipment").

  The heat insulating material installed on the inner peripheral surface of such a curved equipment is roughly classified into a flexible (flexible) heat insulating material and an inflexible (rigid) heat insulating material. The former has excellent workability because it has flexibility, but on the other hand, having softness means that the structure of the heat insulating material is easily destroyed, and the heat insulating material is powdered due to the influence of external force acting during construction. There is a problem that it deteriorates due to deterioration, and as a result, it has poor heat insulation. Therefore, in order to secure high heat insulating properties, it is desirable to use a heat insulating material having no flexibility.

  However, there is a problem that inflexible heat insulating material is inferior in workability. That is, in a curved equipment, since a large number of accessory members are attached (standing) to the inner peripheral surface of the curved surface equipment, if the peripheral length on the tip side between these accessory members is narrower than the inner peripheral installation side length, the heat insulating material is used. Cannot be installed because it cannot be inserted. Further, when the outer peripheral length of the heat insulating material is set to the tip side peripheral length, a problem occurs that a large gap is generated between the joints in the circumferential direction of the adjacent heat insulating material and the heat insulating property is deteriorated. In addition, some of the accessory parts may not be uniform in diameter due to being attached diagonally or by fastening with nuts. Considering such complicated accessory parts, it is easy to install a non-flexible insulation material. Not really. In particular, in the case of curved equipment in which a plurality of accessory members are mixed, the sizes of pipes and the like are usually large and small, and the pipes are randomly installed, which makes the construction more complicated.

  Therefore, in the past, for the construction of inflexible heat insulating material in curved equipment, it is common to cut the heat insulating material into strips in the circumferential direction and lay the pieces in the circumferential direction. Is.

  However, fragmentation increases the number of joints, which essentially leads to a sacrifice of the heat insulating property corresponding to the number of joints. Further, if the joint is excessively cut so that the width becomes narrow, the joint width becomes large, which causes a problem that the heat insulating property is substantially lowered. Furthermore, since the installation interval of the accessory member includes a certain error, it is often necessary to re-process the heat insulating material in the field even if it is a pre-processed heat insulating material, which deteriorates the workability.

JP, 2013-44510, A

  The problem to be solved by the present invention is to provide a heat insulating material which can be easily installed on the inner peripheral surface of a curved equipment and can secure a high heat insulating property, and a construction method thereof.

INDUSTRIAL APPLICABILITY The heat insulating material of the present invention is a heat insulating material that is installed in a curved equipment having a plurality of attached members attached to a curved inner peripheral surface, and is formed by connecting a plurality of inflexible unit heat insulating materials. becomes, Ri can der bent at any of its coupling position, wherein the accessory member has a shape widened tip relative to the proximal portion being attached to the inner peripheral surface of the curved facilities, a curved surface It is characterized in that it has a notch or an opening into which a base end portion of the accessory member can be inserted, on a surface adjacent to another heat insulating material installed adjacent to the facility .

A construction method of the present invention is a construction method of a heat insulating structure using the heat insulating material of the present invention, wherein the heat insulating material is once folded on an inner space side of the curved equipment, and the folded heat insulating material is the attached member. It is characterized in that the heat insulating material is inserted between the attached members, the heat insulating material is spread between the attached members, and the base end portion of the attached member is inserted into the notch or the opening and installed on the inner peripheral surface of the curved equipment. It is a thing.

  Since the heat insulating material of the present invention can be connected to a plurality of inflexible unit heat insulating materials and can be bent at an arbitrary connecting position, it can be folded and made small at the time of construction. Therefore, it can be easily installed on the inner peripheral surface of the curved equipment. Further, since it is not necessary to excessively reduce the size into pieces, the number of joints and the joint width can be reduced, and high heat insulation can be secured.

It is a schematic perspective view which shows one Embodiment of the heat insulating material of this invention. It is a schematic perspective view which shows the example of the state which folded the heat insulating material of FIG. It is a schematic perspective view which shows the state which installed the heat insulating material of FIG. 1 in the inner peripheral surface of a curved surface-shaped equipment. It is a schematic front view which expands and shows the installation state of the heat insulating material shown in FIG.

  1 is a schematic perspective view showing an embodiment of the heat insulating material of the present invention, FIG. 2 is a schematic perspective view showing an example of a state in which the heat insulating material of FIG. 1 is folded, and FIG. It is a schematic perspective view showing a state of being installed on the inner peripheral surface of.

  The heat insulating material 10 of FIG. 1 is formed by connecting seven unit heat insulating materials 1. Specifically, the outer peripheral surfaces of each unit heat insulating material 1 are connected by an adhesive tape 2. Accordingly, the heat insulating material 10 can be folded at any connecting position of the unit heat insulating material 1, and can be folded as shown in FIG. 2, for example.

  Here, the outer peripheral surface of each unit heat insulating material 1 (heat insulating material 10) means that when the heat insulating material 10 is installed on the inner peripheral surface 21 of the curved equipment 20, as shown in FIG. The face to face. In addition, the unit heat insulating material 1 has a trapezoidal shape in the circumferential direction along the inner peripheral surface 21 of the curved equipment 20, and the longer base of the trapezoid is the outer peripheral surface of the unit heat insulating material 1 (heat insulating material 10). Is composed of.

  The unit heat insulating material 1 is obtained by covering the heat insulating material body 1a with the covering material 1b, and is a heat insulating material having no flexibility as a whole. The material of the unit heat insulating material body 1a is not particularly limited as long as it has a heat insulating property. For example, ultrafine powder (fumed silica) having a particle size of 5 to 30 nm as a main raw material and a fine micropore structure of 100 nm or less is used. It is possible to use an inflexible heat insulating material having a high heat insulating property, such as a microporous heat insulating material having a heat insulating property (see, for example, paragraph 0013 of JP 2000-104110 A).

  The coating material 1b protects the unit heat insulating material body 1a from moisture and the like, and may be an aluminum laminate film, a polyethylene film, an aluminum foil, or the like. The coating material 1b may have a minimum thickness necessary to protect the unit heat insulating material body 1a, and specifically, the thickness of the coating material is preferably 150 μm or less.

  Next, a method of constructing the heat insulating material 10 will be described.

  As shown in FIG. 3, on the inner peripheral surface 21 of the curved equipment 20, a plurality of studs 22 as accessory members are attached (standing) at regular intervals in the circumferential direction of the inner peripheral surface 21. On the other hand, the heat insulating material 10 has the same length as the installation side length of the inner circumference between the studs 22 adjacent in the circumferential direction. Therefore, as described above, the heat insulating material 10 cannot be inserted between the studs 22 without being spread out without being expanded. Therefore, in the construction method of the present invention, the heat insulating material 10 is once folded on the inner side of the curved equipment 20 as shown in FIG. 2, and the folded heat insulating material 10 is inserted between the studs 22. The heat insulating material 10 is spread and installed on the inner peripheral surface 21 of the curved equipment 20. Thereby, as shown in FIG. 3, one heat insulating material 10 can be installed on the inner peripheral surface 21 between the studs 22 without a gap. In FIG. 3, an attached member (stud 22a) is erected on the inner peripheral surface 21 of the curved equipment 20 not only in the circumferential direction but also in the longitudinal direction. If the material 10 is provided with the notch or the opening 3 into which the stud 22a can be inserted, the work can be performed without any problem.

  FIG. 4 is a schematic front view showing the installation state of the heat insulating material 10 shown in FIG. 3 in a partially enlarged manner. As shown in FIG. 4, when the heat insulating material 10 is installed on the inner peripheral surface 21 of the curved equipment 20, the side surfaces of each unit heat insulating material 1 are in contact with each other to form an empty joint. That is, in a state where the heat insulating material 10 is installed, the side surfaces of each unit heat insulating material 1 come into contact with each other to form an open joint, so that each unit heat insulating material 1 has a shape corresponding to the shape (curvature) of the inner peripheral surface 21 to be constructed. The shape and dimensions are set. Thereby, the gap between the side surfaces of each unit heat insulating material 1 can be eliminated, and the heat insulating property can be improved.

  In addition, in the case of construction in which a plurality of heat insulating materials is installed on the inner peripheral surface of the curved equipment, each heat insulating material is manufactured in accordance with the design shape of the inner peripheral surface of the construction target, so the inner circumference of the construction target If the surface is as designed, there will be no gaps between the heat insulating materials in the circumferential direction or the longitudinal direction, and it will be an open joint. However, when the heat insulating material is actually installed, such as when the shape of the inner peripheral surface of the construction target deviates from the designed shape, a gap may occur between the heat insulating materials in the circumferential direction or the longitudinal direction. In such a case, an adjustment sheet made of the same material as the unit heat insulating material that constitutes the heat insulating material is sandwiched between the heat insulating materials in the circumferential or longitudinal gaps, or the end surface of the heat insulating material in the circumferential direction or the longitudinal direction is formed in advance. If the adjustment sheet is attached to the construction and the construction is performed, it is possible to eliminate the gaps between the heat insulating materials in the circumferential direction or the longitudinal direction to form an empty joint.

  Referring again to FIG. 4, the maximum gap S between the outer peripheral surface and the inner peripheral surface 21 of each single heat insulating material 1 is preferably set to be less than 7 mm. If the maximum gap S is 7 mm or more, the mortar that fills the gap becomes thick, sagging occurs, the workability deteriorates, and the effective internal volume of the curved equipment 20 decreases.

  As an example, construction was performed in which the heat insulating material of the present invention in which the outer peripheral surfaces of the five unit heat insulating materials were connected with an adhesive tape was installed on the inner peripheral surface of the curved equipment. The inner peripheral surface of the construction target had an inner diameter of 3000 mm, and two accessory members (studs) were erected on the inner peripheral surface at intervals of 725 mm in the circumferential direction. That is, the installation side length of the inner circumference is 725 mm. On the other hand, the circumferential length of the outer peripheral surface of each unit heat insulating material was 145 mm, and by connecting five of these, the circumferential length of the heat insulating material was made the same as the installation side length of the inner circumference.

  In addition, as a comparative example, construction was performed in which the five unit heat insulating materials were individually installed on the inner peripheral surface of the curved equipment.

  Then, the workability and heat insulating property of the examples and the comparative examples were evaluated. The evaluation results are shown in Table 1. In Table 1, the workability was evaluated by the work time, and the work time of 40 seconds or less was evaluated as ◯ (pass) and the work time of more than 40 seconds was evaluated as x (fail). In addition, the heat insulating property was evaluated by the installation area ratio of the heat insulating material to the inner peripheral surface of the construction target, and the installation area ratio of 99.6% or more was evaluated as ○ (pass) and less than 99.6% was evaluated as × (fail). ..

  As shown in Table 1, in the example, it was possible to install the heat insulating material in a much shorter time than the comparative example, and it was confirmed that the workability was improved. Further, in the embodiment, since five unit heat insulating materials are connected and one heat insulating material having a shape matching the inner peripheral surface of the construction object is used, the installation area ratio becomes 100%, and the high heat insulating property is obtained. It was also confirmed that it can be secured.

  On the other hand, in the comparative example, since the five unit heat insulating materials were individually installed, the construction time was long. Further, when each unit heat insulating material was individually installed, a gap was inevitably formed between each unit heat insulating material, so that the installation area ratio decreased to 99.3%.

1 unit heat insulating material 1a unit heat insulating material main body 1b coating material 2 adhesive tape 3 notch or opening 10 heat insulating material 20 curved surface equipment 21 inner peripheral surface 22,22a attached member (stud)

Claims (3)

A heat insulating material to be installed in a curved equipment, which is formed by attaching a plurality of accessory members to a curved inner peripheral surface,
It connects the inflexible plurality of unit heat insulating material, Ri can der bent at any of its coupling position,
The attached member is a shape in which the tip end portion is widened with respect to the base end portion attached to the inner peripheral surface of the curved equipment,
A heat insulating material having a notch or an opening into which a base end portion of the accessory member can be inserted, on a surface adjacent to another heat insulating material installed adjacent to the curved equipment .   The heat insulating material according to claim 1, wherein outer peripheral surfaces of the plurality of unit heat insulating materials are connected to each other with an adhesive tape. The method for applying the heat insulating material according to claim 1 or 2,
Folding the heat insulating material once on the inner air side of the curved equipment,
The folded heat insulating material is inserted between the accessory members, the heat insulating material is spread between the accessory members, and the base end of the accessory member is inserted into the notch or opening to insert the inner circumference of the curved equipment. A method of constructing a heat insulating material, which is characterized by being installed on a surface.

Images