JP5794619B2 - Cylindrical heat insulating material and thermal equipment using the same - Google Patents

Description

  The present invention relates to a cylindrical heat insulating material attached to a thermal device such as a fuel cell main body or a fuel cell reformer, and more particularly to a cylindrical heat insulating material with good extrapolation workability and a thermal device using the same.

  A fuel cell is a device that converts the change in free energy of chemical reaction into electrical energy. Depending on the type of electrolyte used, a polymer electrolyte fuel cell, phosphoric acid fuel cell, molten carbonate fuel cell, solid oxide Type fuel cells, etc., and each has an optimum operating temperature based on the type of electrochemical reaction. In addition, for a reformer that converts hydrogen from raw fuel that supplies hydrogen to the fuel cell, it is necessary to operate the reformer at a temperature optimal for the reforming reaction.

The optimum operating temperature of the solid oxide fuel cell is about 800 to 1000 ° C., the molten carbonate type is about 600 to 700 ° C., and the temperature of the reformer of the solid polymer fuel cell is 600 to 750 ° C. It is.
In order not to reduce the power generation efficiency, it is necessary to maintain the optimum operating temperature regardless of the ambient environment temperature where these are installed. In order to allow the fuel cell to be operated in a thermally insulated state from the ambient temperature, the insulation between the outer cylinder covering the entire fuel cell and the fuel cell main body composed of the electrolyte, the air electrode, and the fuel electrode is covered with a heat insulating material. . The reformer is also covered with a heat insulating material between the outer cylinder covering the entire apparatus and the reformer. Since the outer cylinder is directly exposed to the external environment, it is desirable to insulate the outer cylinder to 60 ° C. or lower, preferably 50 ° C. or lower, regardless of the type of fuel cell body and the operating temperature. On the other hand, from the viewpoint of reducing the size and weight of the device, without increasing the volume of the heat insulating material, in other words, without increasing the size of the outer cylinder, so that the fuel cell main body is not affected by the external environment temperature, A heat insulating material that can efficiently insulate is desired.

  As a lightweight heat insulation system capable of withstanding high temperatures up to about 1000 ° C., Japanese Patent Application Laid-Open No. 2010-33745 (Patent Document 1) describes a fuel cell main body and / or an auxiliary device around the battery main body in order from the battery main body side. A three-layer structure having a first heat insulating material layer made of a flexible inorganic heat insulating material, a second heat insulating material layer made of a flexible airgel heat insulating material, and a third heat insulating material layer made of a flexible inorganic heat insulating material A fuel cell thermal insulation system has been proposed. Here, the flexible inorganic heat insulating material used for the first heat insulating material layer is silica fiber, ceramic fiber or the like (paragraph number 0030). In addition to silica fiber and ceramic fiber, the third heat insulating material layer is inexpensive. It is described that it is also possible to use glass wool (paragraph number 0035). Further, as the flexible airgel heat insulating material used for the second heat insulating material layer, a heat insulating element having a porosity of 97% or more by distributing an open-cell silica porous material to a nonwoven fabric is used (paragraph number). 0033).

In the heat insulating material of Patent Document 1, the edges of the sheet-shaped heat insulating material are abutted to each other, and each layer is wound in a ring shape, or the edges of the sheet-shaped heat insulating material are overlapped, and the first to third The heat insulating material layers up to are wound in order in a spiral manner to be attached to the fuel cell body (paragraph number 0035).
In Patent Document 1, the filling thickness of the whole heat insulating material can be reduced by sharing the function of the heat insulating material among three heat insulating material layers (paragraph number 0028). For example, in the case of a 1kW class small fuel cell system for home use, the first heat insulating material layer is about 5 to 35 mm, and the second heat insulating material layer is 12 to 30 mm by stacking sheet-like materials. The third heat insulating material layer has a thickness of about 4 to 30 mm (paragraph numbers 0049-0052).

JP 2007-1000075 (Patent Document 2) discloses a hollow molded body made of inorganic fibers such as silica fibers and alumina fibers as a heat insulating material used to insulate a reformer for a fuel cell. A heat insulating material having a structure in which a hollow portion of the hollow molded body is filled with a filler made of inorganic powder has been proposed.
Such a heat insulating material is first a dry molding method in which inorganic fibers and an inorganic binder are mixed as needed, put into a predetermined mold and pressed integrally, or inorganic fibers and if necessary A slurry is prepared by adding an inorganic binder and a cationic polymer flocculant, and the slurry is poured into a predetermined mold and dried to produce a hollow molded body. The hollow molded body is hollow. After filling the part with an inorganic powder serving as a filler, it is manufactured by closing the opening of the hollow molded body with a disc-shaped molded product produced separately (paragraph numbers 0043-0049 and Examples).

JP 2010-33745 A JP 2007-1000075 A

  When the heat insulating material proposed in Patent Document 2 is attached to a cylindrical fuel cell main body, a cylindrical hollow molded body having an inner diameter corresponding to the outer diameter of the cylinder of the fuel cell main body is a cavity of the cylindrical body. This is done by extrapolating the part to the body. If there is a difference between the roundness of the main body and the roundness of the hollow portion of the hollow molded body due to variations in production of the fuel cell main body and the hollow molded body, It will be deformed to fit the body. However, a hollow molded body of an inorganic fiber molded body generally lacks flexibility and is fragile. In particular, since the roundness of the hollow molded body is constrained by a ring-shaped molded product that serves as a lid for the opening, the heat insulating material is destroyed when it is deformed by applying an excessive external force.

  In order to prevent the destruction of the heat insulating material due to the mounting operation, the roundness of the disc-shaped lid member covering the hollow molded body and its upper opening, the inner diameter size of the hollow portion, in relation to the outer diameter of the main body, It is necessary to increase the dimensional accuracy so that the error is minimized. However, it is difficult to achieve a high degree of dimensional accuracy for any of the molded body of inorganic fibers such as a fuel cell main body, a reformer, and ceramic fibers operated at a high temperature.

  On the other hand, in the heat insulation system disclosed in Patent Document 1, all of the first heat insulation layer, the second heat insulation layer, and the third heat insulation layer are made of a flexible material. There is no such thing as destruction. Moreover, instead of extrapolating the cylindrical heat insulating material, which is a heat insulating system of Patent Document 1, instead of extrapolating the cylindrical heat insulating material, the heat insulating material is wound around the main body in order from the first heat insulating layer. The method for constructing the system (paragraph numbers 0053 to 0056 and Examples 1 and 2) can cope with the roundness and variation of the main body. However, the method of mounting by winding at the site of use individually is cumbersome and not productive. In Patent Document 1, a core tube corresponding to the outer diameter of the main body of a fuel cell or reformer is used, and the first heat insulating layer to the third heat insulating layer are wound around the core tube in order, and the product is continuously laminated. A cylindrical heat insulating material that enables this is also proposed (paragraph number 0063). However, the cylindrical heat insulating material produced by winding a flexible sheet does not have a so-called waist and is difficult to perform extrapolation work on the main body, and improvement is desired in terms of workability.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to flexibly cope with the roundness of the fuel cell body and the reformer and the variation of products. And it is providing the cylindrical heat insulating material excellent in the extrapolation workability | operativity.

  The present inventor has made various studies on the constituent material of the heat insulating material, particularly the material of the portion extrapolated to the main body of the fuel cell and the reformer, and the cylindrical heat insulating material that has improved workability and productivity without impairing the heat insulating property. Invented material.

That is, the cylindrical heat insulating material of the present invention is a cylindrical heat insulating material that can be attached by extrapolation to a place operated at a high temperature, and a woven fabric formed by weaving a thread of inorganic fibers with an inorganic binder. Ri Do from the treated formed by binder process cross, the tubular core member having a hollow portion of the attachment points and the same shape; the dispersed inorganic airgel fibrous substrate formed by a flexible insulation sheet, said cylindrical core A heat insulating element winding body formed into a cylindrical shape by winding on the outer peripheral surface of the material; and a cylindrical outer packaging material mainly composed of inorganic fibers, laminated on the outermost peripheral surface of the heat insulating element winding body. ing.

  The cylindrical core material preferably has a thickness of 0.3 to 3.0 mm. Moreover, it is preferable that the said thread body is a thread body of 10-400 tex ceramic fiber or glass fiber.

  The inorganic binder is preferably impregnated inside the woven fabric or coated on the surface of the woven fabric, and the binder-treated cloth is formed by laminating the inorganic binder layer on at least one surface of the woven fabric. Preferably there is.

The outer packaging material may be one obtained by winding an inorganic fiber sheet, or one obtained by joining a pair of semi-cylindrical bodies made of an inorganic fiber sheet. In this case, the inorganic fiber sheet, a woven fabric obtained by weaving a yarn of inorganic fibers, it is preferably made of a binder treatment cloth made by treatment with an inorganic binder. Further, the end portion or joint portion of the inorganic fiber sheet is disposed so as not to be on an extension in the thickness direction of the heat insulating element winding body with respect to the winding end portion of the heat insulating element winding body. Is preferred.

  The present invention is also directed to a thermal apparatus equipped with the tubular heat insulating material of the present invention.

  The cylindrical heat insulating material of the present invention is composed of a waisted material in which the core material can stand on its own, and the heat insulating element that is the main part of the cylindrical heat insulating material is composed of a flexible heat insulating sheet. Extrapolation to equipment is easy.

It is a perspective view which shows one Embodiment of this invention cylindrical heat insulating material. It is a perspective view of the core material used for the cylindrical heat insulating material shown in FIG. It is a figure for demonstrating the heat insulation element winding body used for the cylindrical heat insulating material shown in FIG. It is a top view of the outer packaging material of the cylindrical heat insulating material shown in FIG. It is a figure for demonstrating the outer packaging material of FIG. It is a figure for demonstrating the state equipped with one Embodiment of a cylindrical heat insulating material. It is the front view (a) and sectional drawing (b) of the thermal equipment which mounted one Embodiment of the cylindrical heat insulating material to the main body. It is a figure for demonstrating the heat insulation element for lid formation used in FIG. It is a figure for demonstrating the measuring method of a self-supporting load.

Embodiments of the tubular heat insulating material of the present invention will be described below with reference to the drawings.
FIG. 1 shows an embodiment of the tubular heat insulating material of the present invention. A cylindrical heat insulating material 4 shown in FIG. 1 has a heat insulating element winding body 5 formed by winding the flexible sheet-like heat insulating element 2 shown in FIG. 3 on the outer peripheral surface of the core material 1 shown in FIG. The outer packaging material 3 shown in FIG. 4 is laminated on the outermost peripheral surface of the heat insulating element winding body 5.

<Core>
The core material 1 is a cylindrical core material made of a binder-treated cloth obtained by treating a woven fabric formed by weaving a thread of inorganic fibers with an inorganic binder, and the hollow portion 10 of the core material 1 is described later. It is extrapolated to the main body A of the thermal equipment.

The fabric composing the core 1, although depending on the type of yarn material used, thread density 15-60 present / 25 mm, preferably 20 to 60 present / 25 mm, thickness 0.05 to 1.0 mm, A woven fabric of 0.2 to 0.6 mm is preferable. In general, woven fabrics have gaps in the thread bodies constituting warps and wefts, so that when a plurality of woven fabrics are stacked to a predetermined thickness, the pores are regularly arranged. become. This is because air tends to convect through the woven fabric, and the heat insulation effect by air is considered to be impaired, and the fibrous heat insulating material generally used as a heat insulating material made of inorganic fibers, that is, inorganic fibers are made into cotton. Compared to a fiber insulation material that has been compressed into a mat shape by compressing it, or in a felt shape with a needle punch, etc. Tend to be inferior.

Examples of the inorganic fibers constituting the thread body include silica fibers, alumina fibers, silica-alumina fibers, zirconia fibers and other ceramic fibers, glass fibers, carbon fibers, metal fibers, basalt fibers, and the like. A ceramic fiber having a large thermal resistance value (R) is preferably used. The size of the inorganic fibers to be used is not particularly limited and is properly selected depending on the type of the yarn body.
Yarn constituting the woven fabric is a single yarn of the long fiber, yarn twisting, may be a pull aligned yarn, or may be a spun yarn obtained by spinning short fibers. The thickness of the thread body to be used varies depending on the weaving method and the yarn density so as to obtain a predetermined rigidity, but is usually 10 to 400 tex, preferably 30 to 300 tex, more preferably 50 to 200 tex. It is.

The woven fabric has been formed by weaving such yarns body, weaving method does not particularly restricted, plain weave, weave twill, satin, leno weave, woven Mosha, a combination of these It may be a weave, a folded structure, or a pile fabric.

  Inorganic binders used in the binder-treated cloth include ceramic particles or fibers such as silica and alumina, montmorillonite, vermiculite, iron montmorillonite, beidellite, saponite, hectorite, stevensite, nontronite, kaolinite, smectite, mica, talc. Such as clay, colloidal silica, and combinations thereof.

  The method for producing the binder-treated cloth is not particularly limited. Usually, a dispersion obtained by dispersing the inorganic binder in water or an organic solvent is applied to a) a woven fabric and then dried, or b) dispersed. After the woven fabric is immersed in the liquid, it is dried to fill the pores of the woven fabric with a binder or to form a binder layer on the surface of the woven fabric. The binder-treated cloth thus obtained has a so-called firmness to the extent that it can be self-supporting at a thickness of 0.2 mm or more by filling the gaps of the woven fabric with the inorganic binder. As will be described later, the extrapolation work to the main body of the heat equipment becomes easy as the cylindrical core material.

  The core material may be formed by forming one binder-treated cloth into a cylindrical shape, or may be wound into a cylindrical body made of a laminated body in which 2 to 10 woven fabrics are overlapped. In the case of a laminated body, the inorganic binder contained in the binder-treated cloth also serves as an adhesive between the laminated cloths, and can improve the adhesion as a laminated body.

  The thickness of the binder-treated cloth is preferably 0.3 to 3.0 mm even when it is a laminate or a layer made of an inorganic binder is formed on the surface of the woven fabric. This is because the binder-treated cloth only needs to have a thickness that can secure a waist sufficient for extrapolation workability, and the thermal resistance value tends to decrease as the thickness increases. Here, the thermal resistance value (R) is a value calculated by (thickness ÷ thermal conductivity), and is an index of difficulty in transferring heat, indicating that heat transfer is difficult as the numerical value is larger.

Inorganic binders are generally inferior in heat-insulating properties compared to ceramic fibers and glass fibers in terms of materials. Moreover, it has higher thermal conductivity than air. Therefore, inter-woven fabric weave, filling an inorganic binder yarn body clearance, or that forming an inorganic binder layer woven fabric surface is disadvantageous from the viewpoint of heat insulation. In the present invention, by setting the thickness of the core material to 0.3 to 3.0 mm, preferably 0.5 to 2.0 mm, the cylindrical shape is secured while ensuring the rigidity necessary for the extrapolation work to the thermal equipment. It is characterized in that the proportion of the core material in the heat insulating material is kept small. In this respect, since the commercially available fibrous heat insulating material usually has a thickness of 4.0 to 50 mm, it is difficult to produce a core material having a thickness of 3 mm or less with the fibrous heat insulating material.

<Heat insulation element wound body>
The heat insulating element wound body 5 is obtained by winding a flexible heat insulating element sheet 2 in which inorganic airgel is dispersed in a nonwoven fabric. Specifically, the heat insulation element sheet | seat 2 disperse | distributes inorganic airgel to the nonwoven fabric which consists of inorganic fiber used as a fibrous base material.

  The airgel has open pores in the range of about 0.5 to 500 nanometers, and is an open cell type porous material having a porosity of about 80 vol% or more, preferably 90 vol% or more, more preferably 95 vol% or more. Is the body. Such an airgel is obtained by removing the solvent by exposing the wet gel produced by the sol-gel method or the like to a temperature and pressure higher than the critical point of the solvent contained in the wet gel. . Such an airgel can act as an excellent heat insulating material because air cannot convect beyond the lattice structure, and as a result, an insulating element sheet in which such an airgel is dispersed is also excellent. Thermal insulation can be shown.

  Inorganic aerogels are based on metal alkoxides and include materials such as silica, carbides and alumina. Among these, silica airgel is preferably used because it has high affinity with the binder-treated cloth that is a constituent material of the core material and exhibits excellent heat resistance.

  In addition, it is preferable that an airgel does not contain a chlorine component. This is because if the airgel contains a chlorine component, there is a risk of corroding the metal material of the thermal equipment and its peripheral equipment.

  The heat insulating element sheet 2 may be formed by a batch-type sol-gel casting method using a nonwoven fabric for fiber batts used as a reinforcing material. For example, as disclosed in JP-T-2007-524528, the low viscosity of a sol Continuous or semi-continuous sol-gel by continuously mixing a solution and a reagent (thermal catalyst or chemical catalyst) that induces gel formation and distributing the sol on the nonwoven fabric at a rate that effectively causes gelation. It may be formed by casting.

In addition, as said nonwoven fabric, the nonwoven fabric of the inorganic fiber which has heat resistance of 500 degreeC or more, such as glass fiber, a silica fiber, a ceramic fiber, is used.
The thickness of the heat insulation element sheet | seat which has the above structures is 3.0 to 10 mm normally.

The heat insulating element wound body 5 is formed by winding the heat insulating element sheet 2 on the surface of the core material 1 in a spiral shape or a spiral shape.
The thickness of the heat insulating element winding body 5 depends on the size of the tubular heat insulating material 4 as a final product. The heat insulating element sheet 2 having the above-described configuration is efficient because it is a material excellent in heat insulating properties compared to a binder-treated cloth that is a constituent material of the core material 1 and a general inorganic fibrous heat insulating material. In order to achieve heat insulation, it is preferable to increase the occupation ratio of the heat insulating element sheet 2 in the tubular heat insulating material 4. Therefore, in the cylindrical heat insulating material 4, it is preferable that the remaining portions other than the core material 1 and the outer packaging material 3 are constituted by the heat insulating element winding body 5. Therefore, the thickness of the heat insulating element winding body 5 is a thickness obtained by subtracting the thickness of the core material 1 and the outer packaging material 3 from the thickness of the cylindrical heat insulating material 4.

  In constructing the heat insulating element winding body 5 from the heat insulating element sheet 2, as shown in FIG. 2 (b), the end portions 23 and 24 of the heat insulating element sheet 2 are cut out to start the winding start end portion 25 and the winding end, respectively. The end portion 26 is preferable. By using the heat insulation element sheet | seat which cut off the edge parts 23 and 24, it can be set as the heat insulation element winding body 5 from which an outermost peripheral surface does not protrude. Further, when the heat insulating element sheet 2 is wound, the winding start end portion 25 and the winding end portion 26 are wound so that the winding start end portion 25 and the winding end end portion 26 coincide with each other in the radial direction. A gap can be reduced between the end portion 26 and the end portion.

  The heat insulating element winding body 5 is obtained by fixing the winding end end portion 26 at the fixing portion 6 using an adhesive tape, a fixing band, or the like, or by applying an adhesive to the back surface of the heat insulating element sheet 2. Therefore, it is preferable to keep the shape of the wound body stable.

<Outer packaging material>
The outer packaging material 3 is laminated on the outermost peripheral surface of the heat insulating element winding body 5 to prevent airgel dust contained in the heat insulating element winding body 5 from being scattered outside.

In the cylindrical heat insulating material 4 shown in FIG. 1, the outer packaging material 3 has a pair of semi-cylindrical bodies made of inorganic fiber sheets fixed to each other by a fixing portion 7 so as to seal the outer periphery of the heat insulating element winding body 5. I have to.
As the inorganic fiber sheet, there can be used a fiber mat, felt, nonwoven fabric, or the like formed from glass wool or rock wool, which is known as a so-called fibrous heat insulating material. Further, an inorganic binder may be applied to the sheet surface, or the inter-fiber gap may be impregnated with the inorganic binder. Further, similarly to the core 1, a woven fabric obtained by weaving a yarn of inorganic fibers may be used binder treatment cloth treated with an inorganic binder.

  As inorganic fibers constituting the outer packaging material, ceramic fibers such as silica fibers, alumina fibers, silica-alumina fibers, zirconia fibers, glass fibers, carbon fibers, metal fibers, basalt fibers, and the like can be used. Further, as an inorganic binder, ceramic particles or fibers such as silica and alumina, montmorillonite, vermiculite, iron montmorillonite, beidellite, saponite, hectorite, stevensite, nontronite, kaolinite, smectite, mica, talc and other clays, Colloidal silica, a combination thereof, or the like can be used.

  In the case of using a binder-treated cloth as the inorganic fiber sheet constituting the outer packaging material 3, it is possible to suppress a decrease in heat insulation performance by setting the thickness to about 0.5 to 3.0 mm. On the other hand, in terms of cost, felt or inexpensive glass wool may be used. These materials are appropriately selected according to the characteristics required for the cylindrical heat insulating material 4 and the use conditions.

The fixing portion 7 may be fixed by an adhesive tape, a fixing band, or the like, or may be fixed by an adhesive formed on the back surface of the outer packaging material 3 to form the cylindrical outer packaging material 3.
In the tubular heat insulating material 4 shown in FIG. 1, the fixing portion 6 of the heat insulating element winding body 5 and the fixing portion 7 of the outer packaging material 3 are arranged so as not to overlap in the thickness direction. By shifting the position of the fixing part for forming the cylindrical body, the sealing function of the outer packaging material 3 can be enhanced.

  The cylindrical heat insulating material 4 having the above configuration is attached to the main body of the fuel cell. The size (cylinder height) of the cylindrical heat insulating material 4 may be the same as the length of the main body to be attached (corresponding to the height of the cylindrical main body) (FIG. 6A), or from the cylindrical main body. May be shorter (FIGS. 6B and 6C) or longer (FIGS. 6D and 6E). When the cylindrical heat insulating material is higher than the main body, it may be mounted so that a space D is formed above (FIG. 6D), and spaces D and D are formed above and below, respectively. (Fig. 6 (e)).

  In the above embodiment, the outer packaging material is formed by adhering a pair of semi-cylindrical bodies. However, the outer packaging material constituting the cylindrical heat insulating material of the present invention is not limited to this, and is simply an inorganic fiber sheet. May be formed by winding the wire around the outer periphery of the heat insulating element wound body.

  Moreover, in the said embodiment, although it was cylindrical shape, the cylindrical heat insulating material of this invention is not limited to this. The shape of the hollow portion of the core material may be the same shape as the outer shape of the thermal device, and a hollow rectangular parallelepiped, a cube, or the like is appropriately selected in addition to the cylindrical body.

  Furthermore, the use of the tubular heat insulating material of the present invention has been described by taking the fuel cell main body as an example in the above embodiment. However, in addition to the main body of the fuel cell, it is cylindrical and prismatic and is hotter than the installation environment. Other thermal equipment such as a reformer operated in the above or an accessory device thereof may be used as a heat insulating material for maintaining a high temperature.

  In the tubular heat insulating material of the present invention having the above-described configuration, since the core material that is an extrapolated portion of the main body is formed of a heat insulating material that can be self-supporting, it is easy to perform extrapolation work on the attached thermal equipment. It becomes. Moreover, since the heat insulating element winding body that occupies most of the cylindrical heat insulating material is composed of a flexible sheet winding body, the entire tubular heat insulating material can be deformed to some extent. It is possible to follow, and it is also possible to deal with variations in dimensional accuracy of the thermal equipment body to be attached. Furthermore, by reducing the occupancy ratio of the core material, which is inferior in heat insulating properties, in the entire tubular heat insulating material, the decrease in the heat insulating performance is suppressed, and the occupying ratio of the heat insulating element winding body having high heat insulating performance is increased. Thus, it becomes possible to improve the heat insulation performance more than before.

<Thermal equipment>
The thermal equipment of the present invention is the one in which the tubular heat insulating material of the present invention is attached to a location operated at a high temperature, such as a thermal equipment body. In this case, the height of the cylindrical heat insulating material is preferably equal to the height of the main body portion serving as an attachment location, but may be different as shown in FIGS. 6 (b) to 6 (e).

  When the heights are different, a part of the thermal device is exposed (FIGS. 6B and 6C), and a space is generated between the tubular heat insulating material and the thermal device in the attached state. Insufficient portion of the cylindrical heat insulating material (C in FIGS. 6 (b) and 6 (c)), which causes the exposure of the thermal equipment, so that heat insulation is not impaired by heat radiation from the exposed portion or by space, newly It is preferable to separately fill the space (D in FIGS. 6D and 6E) with a heat insulating material.

  As an example of a thermal apparatus attached with a cylindrical heat insulating material, when a cylindrical heat insulating material (FIG. 6 (e) type) 4 'longer than the height of the main body A is attached to a cylindrical main body portion such as a fuel cell main body. Will be described with reference to FIG.

FIG. 7 shows a case where a cylindrical heat insulating material 4 ′ is attached to the main body A of the cylindrical heat apparatus, FIG. 7A is a front view of the attached state, and FIG. 7B is a cross-sectional view. is there.
Heat insulating lids 200 and 201 as shown in FIG. 8A are placed in the recesses of the upper space and the lower space D, respectively, generated by adopting the cylindrical heat insulating material of FIG. 6E type. The adhesive tapes 100 and 101 are fixed to the tubular heat insulating material 4 ′.

  As shown in FIG. 8B, the heat insulating lids 200 and 201 include first box bodies 500 and 501 made of an inorganic fiber material having one end opened, lid forming heat insulating elements 300 and 301, and this lid forming lid. It consists of second box bodies 400 and 401 made of an inorganic fiber material having one end opened to accommodate heat insulating elements 300 and 301, and adhesive tapes 700 and 701. The openings of the second box bodies 400 and 401 are closed inside (bottom surfaces) of the first box bodies 500 and 501, respectively. The second box bodies 400 and 401 have flanges 400A and 401A formed on the outside thereof.

  The openings of the second boxes 400 and 401 are respectively closed at the substantially central positions on the inner sides (bottom surfaces) of the first boxes 500 and 501, and the inner sides (bottom surfaces) of the first boxes 500 and 501 are closed. ) Is attached (in the direction of the arrow) to the second box bodies 400 and 401 in which the heat insulating elements 300 and 301 are accommodated, and then the flange portions 400A and 401A are attached with the adhesive tapes 700 and 701. Produced. The heat insulating lids 200 and 201 are formed with spaces 600 and 601 in which the tubular heat insulating material 4 is arranged. The heat insulating lid 200 is provided with a hole (not shown) through which the tube B can be inserted.

[Measurement evaluation method]
(1) Thermal insulation Extrapolate the produced cylindrical heat insulating material to a 650 ° C. column, and attach the outer surface (A part) of the thermal equipment to be mounted, the outer peripheral surface (B part) of the core material, and the insulating element winding body. The middle part in the thickness direction (in the case of a three-layer laminate, the middle of the second layer, and in the case of a seven-layer laminate, the middle of the fourth layer is C part), the outer peripheral surface (D part) of the outer packaging material The temperature was measured. The temperature was measured by inserting a K-type thermocouple to a depth of about 1/2 the height of the cylindrical body at a position to be a measurement site.

(2) Self-supporting load (waist)
Using the materials used for the core material (fiber sheet, binder-treated fiber sheet, woven fabric, binder-treated cloth), a test piece having a width x length of 30 mm x 100 mm was prepared. As shown in FIG. A load M is applied to the short side (upper edge) which is not fixed to the horizontal plate in a state where 2 cm from the edge is fixed on the horizontal plate and is allowed to stand at a height of 5 cm from the horizontal plate. The height from the horizontal plate when hung was measured. Further, the load M (g) when the upper edge contacted with the horizontal plate was measured.

(3) Extrapolation workability A cylindrical body having an outer diameter of 96 mm corresponding to the fuel cell main body was prepared, and the produced cylindrical heat insulating material was extrapolated by hand to the cylindrical body. When extrapolating, the end of the cylindrical insulation hits the end of the cylinder and bends or turns over, making it difficult to extrapolate. The case where it was difficult to extrapolate due to reasons such as “△”, and the case where extrapolation was possible without problems were considered good (“◯”).

[Types and independence of core material]
Core material S0:
Super wool mat YWM (thickness 10 mm) manufactured by Yazawa Sangyo Co., Ltd. was used. The super wool mat YWM is an inorganic fiber mat obtained by defibrating silica fibers into a wool shape and then forming the felt shape by needling. With respect to the core material S0, when the above self-supporting load test was attempted, the posture shown in FIG. 9 could not be maintained.

Core material S1:
100 g / 140 cm of coating solution obtained by diluting Thermodyne CW (main components: silica and alumina) of Shin Nippon Thermal Ceramics Co., Ltd. with water on the surface of Super Wool Mat YWM (thickness 10 mm) manufactured by Yazawa Sangyo Co., Ltd. ^{After 2} was applied, it was dried to obtain a core material S1. The results of measuring the self-supporting load based on the above method are shown in Table 1.

Core material S2:
Super wool mat YWM (thickness 10 mm) manufactured by Yazawa Sangyo Co., Ltd. was dipped in a 5% aqueous solution of bentonite, sufficiently impregnated with an aqueous binder solution, then taken out and dried to obtain a core material S2. The results of measuring the self-supporting load based on the above method are shown in Table 1.

Core material S 4 :
A woven fabric (thickness: 0.3 mm, yarn density: 55/25 mm, 53/25 mm) formed by satin weaving of a silica fiber thread (67.5 tex) was used. This core member S 4, was attempted the耐自upright load test, it was not possible to hold the position shown in FIG.

Core material S 3
The surface of the woven fabric used in the core S 4, after coating an inorganic binder was used (Samodain CW) in the core material S1, by drying, the inorganic binder layer is formed on the woven fabric both sides, thickness 1. It became 0 mm. This was the core S 3, and measuring the耐自standing load. The results are shown in Table 1.

  The core materials S0 and S4 were not subjected to the inorganic binder treatment, were not waisted, and could not stand on their own. The core materials S1 and S2 formed by treating the silica fiber felt with the inorganic binder and the S3 formed by treating the silica fiber woven fabric with the inorganic binder can all be self-supporting, and S3 has the largest self-supporting load.

[Production of tubular insulation]
Cylindrical insulation No. 1, 2:
A silica fiber felt (S0 ′ or S2 ′) having a thickness of 18 mm made of the same material as the core material (S0 or S2) shown in Table 2 was used. Table 2 shows the self-supporting load of each core material (load when installed by the above measurement method). The core material was produced by winding the core tube into a core tube having an outer diameter of 96 mm and then extracting the core tube.
On the surface of this core material, an airgel sheet (thickness 6 mm) in which silica airgel (porosity 95 vol%) was dispersed in a glass fiber nonwoven fabric was wound three times to form a heat insulating element wound body having a thickness of 18 mm.
By winding a silica fiber felt on the outermost surface of this heat insulating element winding body, an outer packaging material having a thickness of 18 mm is formed. 1 or No. 2.
The heat insulating property and extrapolation workability of the produced cylindrical heat insulating material were measured and evaluated based on the evaluation method. The results are shown in Table 2.

Cylindrical insulation No. 3, 4:
After winding the sheet | seat which consists of core material (S3 or S4) material shown in Table 2 to the core pipe of outer diameter 96mm, the core material which has the thickness shown in Table 2 was produced by extracting a core pipe.
On the surface of this cylindrical core material, The airgel sheet (thickness 6 mm) of the same type as that used in No. 1 was wound seven times to form a heat-insulating element wound body having a thickness of 42 mm.
On the outermost surface of this heat insulating element winding body, 1 is wound to form an outer packaging material having a thickness of 10 mm. 3 or No. It was set to 4.
The heat insulation property and extrapolation workability of the produced cylindrical heat insulating material were measured and evaluated based on the evaluation method. The results are shown in Table 2.

Cylindrical insulation No. 5:
No. except that the outer packaging material was made of the same material as the core material S3. In the same manner as in Example 4 , a cylindrical heat insulating material was produced. The heat insulating property and extrapolation workability of the produced cylindrical heat insulating material were measured and evaluated based on the evaluation method. The results are shown in Table 2.

  No. 1 and 2, the cylindrical heat insulating material provided with the core material using the silica fiber felt could not satisfy the extrapolation workability even if it could be self-supporting by the binder treatment. No. 1 and No. From the comparison of 2, there was a tendency that the heat insulation of the core material was slightly inferior due to the binder impregnation. From these facts, increasing the thickness increases the binder filling amount and increases the self-supporting load, but the heat resistance tends to be rather impaired, so in the core material using inorganic fiber felt, the heat resistance and extrapolation work It can be seen that it is difficult to balance the sex.

  On the other hand, no. 3 and no. From the comparison of 4, it can be seen that when silica fiber woven fabric is used as the core material, the effect on heat insulation is not recognized by using the binder-treated cloth, but the self-supporting load resistance is greatly improved. In particular, it can be seen that the self-supporting load necessary to ensure extrapolation workability can be secured with a thickness thinner than that of the silica fiber felt (No. 4). Therefore, it is possible to achieve both heat resistance and extrapolation workability by using a binder-treated cloth for the core material.

  No. 4 and no. From the comparison with No. 5, the use of the binder-treated cloth for the outer packaging material, the thickness of the tubular heat insulating material was reduced, but the extra workability was not impaired. It was found that the same thermal insulation as that of 4 could be secured.

  Since the tubular heat insulating material of the present invention has good extrapolation workability, which is the work of attaching to a thermal apparatus, it is possible to automate the work of attaching the tubular heat insulating material. Moreover, since it can ship in the state of a cylindrical heat insulating material, productivity is good. Therefore, production efficiency is good and useful for both the producer side and the user side of the cylindrical heat insulating material.

DESCRIPTION OF SYMBOLS 1 Core material 2 Thermal insulation element sheet 3 Outer packaging material 4 Cylindrical thermal insulation material 5 Thermal insulation element winding body A Main body of thermal equipment

Claims (10)

It is a cylindrical heat insulating material that can be attached by extrapolation to a place operated at high temperature,
Ri Do a woven fabric formed by weaving a yarn of inorganic fibers from the binder treated cloth obtained by treatment with an inorganic binder, cylindrical core having a hollow portion of the attachment points and the same shape;
A heat insulating element winding body formed into a cylindrical shape by winding a flexible heat insulating sheet in which an inorganic airgel is dispersed in a fibrous base material on the outer peripheral surface of the cylindrical core material; laminated on the outermost peripheral surface of the rotating member, the inorganic fibers tubular heat insulating material having a tubular outer material mainly composed of. The cylindrical heat insulating material according to claim 1, wherein the cylindrical core material has a thickness of 0.3 to 3.0 mm. The cylindrical heat insulating material according to claim 1 or 2, wherein the thread body is a thread body of 10 to 400 tex ceramic fiber or glass fiber. The cylindrical heat insulating material according to any one of claims 1 to 3, wherein the inorganic binder is impregnated inside the woven fabric or coated on the surface of the woven fabric. The cylindrical heat insulating material according to any one of claims 1 to 4, wherein the cylindrical core material is formed by laminating the inorganic binder layer on at least one surface of the woven fabric. The cylindrical heat insulating material according to any one of claims 1 to 5, wherein the outer packaging material is a wound inorganic fiber sheet. The cylindrical heat insulating material according to any one of claims 1 to 5, wherein the outer packaging material is formed by joining a pair of semi-cylindrical bodies made of an inorganic fiber sheet. The cylindrical heat insulating material according to claim 6 or 7, wherein the inorganic fiber sheet is composed of a binder-treated cloth obtained by subjecting a woven fabric obtained by weaving a thread of inorganic fibers to an inorganic binder. 6. The end portion or joint portion of the inorganic fiber sheet is disposed so as not to be on an extension in the thickness direction of the heat insulating element winding body with respect to the winding end portion of the heat insulating element winding body. The cylindrical heat insulating material in any one of -8. A thermal apparatus equipped with the cylindrical heat insulating material according to any one of claims 1 to 9.

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