JP2014005173A - Inorganic fiber molded body and insulation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a protection/insulation member which uses an inorganic fiber molded body formed by impregnating an inorganic fiber needle blanket, being an excellent scale resistant material, with an inorganic sol and dehydrating the material; and especially the inorganic fiber molded body serving as an insulation member that is excellent in application to a member to be protected having a substantially columnar shape or the like, for example, with blocked upper and lower parts.SOLUTION: An inorganic fiber molded body 10 is in a substantially half cylindrical shape formed by splitting a cylinder in halves along a first parting plane 11 and a second parting plane 12 in a cylindrical axis direction. An engaging salient 13 extends to a top edge of the inorganic fiber molded body from a top edge of the second parting plane 12, and an engaging recess part 14 is formed between the engaging salient 13 and the first parting plane 11. Two inorganic fiber molded bodies 10, 10 are engaged to be a cylindrical insulation material.

Description

  The present invention relates to an inorganic fiber molded body and a heat insulating member made of the inorganic fiber molded body, and is particularly suitable for use as an incidental facility / member in a high temperature apparatus such as a burner or a blast furnace, a heat insulating member such as a high temperature pipe, or the like. The present invention relates to an inorganic fiber molded body and a heat insulating member. Specifically, inorganic fibers that can be easily applied to a heat-insulated member in a cylindrical shape, in particular, a shape and state where it is difficult to maintain and maintain the strength, such as a cylindrical member to be protected whose both ends are closed. The present invention relates to a molded body and a heat insulating member.

  An inorganic fiber molded body is used as a member for protecting and insulating a substantially cylindrical object such as a high-temperature pipe. For example, a flexible alumina fiber, silica fiber, mullite (aluminosilicate) fiber or the like, or a molded product obtained by compressing them, is formed into a thin disk shape (ring shape) or a shape in which a notch is formed, and these are formed into a cylindrical shape. Fit a lot into the symmetric object and stack.

  Since the heat insulating member has a large shrinkage rate, a gap is easily generated between the heat insulating members. In addition, there was a problem of scale resistance (erosion and embrittlement starting from low melting point generation by iron oxide).

  As a method for solving such a problem, a method using a rigid, inorganic fiber molded body that has been vacuum-formed with respect to the flexible heat insulating member as described above has been proposed (for example, Patent Document 1, 2).

  In Patent Document 2, as shown in FIGS. 5 and 6, a ring-shaped heat insulating material 2 attached to the pipe body 1 is a combination of two C-shaped divided pieces 2 a and 2 b each having a half-shaped ring. ing. Each C-shaped split piece 2a, 2b is provided with a hook-shaped engaging convex portion 3b and an engaging groove 3a. The engaging convex portion 3b and the engaging groove 3a are fitted to each other to be divided. The pieces 2a and 2b are connected to each other, and separation between the divided pieces 2a and 2b is prevented. FIG. 6 shows a walking beam type heating furnace 5 to which the heat insulating material 2 is attached. Beams 4 and 4a are respectively provided at the upper ends of the fixed pipe 1a and the pipe body 1, and the steel plates 6 are sequentially transferred and conveyed as indicated by arrows.

  As a material with improved scale resistance, a technique has been proposed in which a coating agent containing spinel with excellent scale resistance is applied to the surface of an inorganic fiber molded body to provide a coating layer to protect the heat insulating material (for example, a patent). Reference 3).

  A technique has also been proposed in which an amorphous refractory containing a spinel phase is used as a refractory for lining in a furnace by using it for casting or spraying (see, for example, Patent Document 4).

  Patent Document 5 proposes a method using an inorganic fiber molded body obtained by impregnating an inorganic fiber needle blanket with an inorganic sol and then drying it.

Japanese Utility Model Publication No.57-40295 JP 2004-43918 A JP 2011-32118 A Japanese Patent Laid-Open No. 2002-241182 JP 2011-208344 A

  In the methods described in Patent Documents 1 and 2, the conventional inorganic fiber molded bodies (divided bodies 2a and 2b) on the thin plate are stacked on the longitudinal direction of the member to be protected (pipe body 1), and the construction becomes complicated. There was a problem. Further, even with these materials, the scale resistance is not improved by simply making them hard.

  Since the divided bodies 2a and 2b of Patent Document 2 shown in FIG. 5 are fitted so that one divided body 2a is fitted into the other divided body 2b from above, the divided body 2a is engaged with the divided body 2b. Requires a space larger than the thickness d of the divided bodies 2a and 2b above the divided body 2b. Therefore, when the beam 4 is provided at the upper end as in the pipe 1 and the floor surface is present on the lower side, and there is not enough space near the upper part of the pipe 1 (hereinafter, this situation is referred to as this situation). In the case of “when the top and bottom are closed”), the split bodies 2 a and 2 b cannot be mounted on the upper part of the pipe 1.

  That is, when one divided body 2b is applied to the outer surface of the pipe 1 and the other divided body 2a is attached to the divided body 2b, the divided body 2a is disposed above the divided body 2b, and the divided body 2a is placed on the pipe 1 The engaging projection 3a and the engaging groove 3b are engaged with each other. When the upper surface of the divided body 2b is in contact with or close to the beam 4, the upper surface of the divided body 2b The space between the beam 4 and the beam 4 is less than d, and the divided body 2a cannot be arranged higher than the divided body 2b. For this reason, it becomes impossible to mount the divided body 2a on the divided body 2b. Therefore, when the divided bodies 2a and 2b are packaged on the pipe 1, the upper portion of the pipe 1 is not covered with the heat insulating material 2 unless the length of the pipe 1 is an integral multiple of the dimension d.

  In the method described in Patent Document 3, it is difficult to strengthen the adhesion between the coat layer to be used and the inorganic fiber molded body. In addition, the coating layer is peeled off due to thermal shock, mechanical shock, etc., and there is a problem that weak inorganic fibers are exposed to the scale. In addition, after the inorganic fiber molded body is constructed, the construction is sprayed with a spray gun, so that the work becomes complicated.

  The amorphous refractory obtained by the construction method described in Patent Document 4 has a problem that it is brittle because there are many voids, and cracks and the like occur due to thermal shock and mechanical shock. In addition, there is a problem that not only complicated work such as spraying and pouring is required on site, but the working environment is remarkably lowered, such as a large amount of finely divided inorganic fibers flying in the air.

  In the method described in Patent Document 5, although improvement in scale resistance can be expected, for example, when a flat plate shape is used, the contraction rate in the thickness direction is large. The generation of gaps is considered to be a problem, and there is a problem that it is not practical.

  In addition, this needle blanket can be made in accordance with the shape of a protected member such as a substantially cylindrical shape so that it can be dried after impregnation with an inorganic sol. However, after molding, the end is released due to low flexibility. If not, for example, when trying to apply to a protected member whose top and bottom are closed like a structural support, the molded body cannot be deformed, so by fitting the protective member to the protected member Construction was difficult.

  An object of the present invention is to provide a protective / heat insulating member using an inorganic fiber molded body obtained by impregnating an inorganic sol into an inorganic fiber needle blanket, which is an excellent scale-resistant material. In particular, an object of the present invention is to provide an inorganic fiber molded body that is a heat insulating member excellent in application to a member to be protected, such as a substantially cylindrical shape, in a state where the top and bottom are closed.

  The inorganic fiber molded body of the present invention is an inorganic fiber molded body obtained by impregnating an inorganic fiber needle blanket with an inorganic sol, and then drying, and the cylindrical body is divided into a plurality of parts by dividing surfaces in the cylinder axis direction. Engaging convex portions and engaging concave portions for preventing separation between the inorganic fiber molded bodies in a state of having a divided cylindrical shape and forming a cylindrical body by combining a plurality of the inorganic fiber molded bodies. In the inorganic fiber molded body provided on each divided surface of the inorganic fiber molded body, the divided surface has a first divided surface on one end side in the cylinder axis direction and a second divided surface on the other end side. The engaging convex portion extends from the second divided surface to the one end side, and the engaging concave portion is formed between the engaging convex portion and the first divided surface. It is what.

  It is preferable that the engagement convex part on one side of the inorganic fiber molded body and the engagement convex part on the other side are oriented in the same direction.

  The dividing surface is preferably oblique to the radial direction of the cylindrical body. Here, the dividing surface in the cylinder axis direction does not only indicate that the dividing surface is parallel to the cylinder axis. That is, it shows that the said division surface exists in the longitudinal direction of a pipe | tube, and it may have the relationship which has a certain amount of angle with an axial center line.

  In this way, when the split surface has an angle with the cylinder axis, for example, the load on the engagement uneven portion generated when a plurality of the inorganic fiber molded bodies of the present invention are engaged, for example, the entire split surface having the angle. However, it will receive, and it can anticipate the damage prevention effect of the inorganic fiber molded object which concerns on this invention. The angle of this dividing surface is, for example, about ± 10 ° with respect to the cylinder axis.

  It is preferable that the inorganic fiber has an average fiber diameter of 5 to 7 μm and does not substantially contain a fiber having a fiber diameter of 3 μm or less.

  The inorganic fiber is preferably a polycrystalline alumina / silica fiber containing 65 to 98% by mass of alumina and 2 to 35% by mass of silica.

  The inorganic sol preferably contains one or more selected from the group consisting of alumina, spinel, zirconia, magnesia, titania, calcia, and a material having the same composition as the inorganic fiber.

  The heat insulating material of the present invention is composed of the inorganic fiber molded body of the present invention.

  According to the present invention, it is possible to apply an inorganic fiber molded body excellent in scale resistance to more members. For example, a member to be protected in a state where the upper and lower sides are closed, specifically, for example, a member to be protected such as a high-temperature pipe or a skid post can be easily installed on the outer peripheral portion thereof. Moreover, the generation | occurrence | production and dropping | omitting of a space | gap with time can be prevented.

It is a perspective view of the inorganic fiber molded object which concerns on embodiment of this invention. It is a top view of the inorganic fiber molded object of FIG. It is a perspective view which shows the cylindrical heat insulating material which combined the inorganic fiber molded object of FIG. It is a perspective view of the cylindrical heat insulating material which combined the inorganic fiber molded object which concerns on another embodiment. It is a perspective view of the conventional inorganic fiber molded object. It is a side view of a walking beam type heating furnace. It is a perspective view of the inorganic fiber molded object which concerns on embodiment. It is a perspective view of the cylindrical heat insulating material which combined the inorganic fiber molded object of FIG. It is a top view of the inorganic fiber molded object which concerns on embodiment. It is a top view of the inorganic fiber molded object which concerns on embodiment.

  Hereinafter, the inorganic fiber molded body according to the embodiment will be described with reference to the drawings.

  The inorganic fiber molded body 10 shown in FIGS. 1 to 3 has a substantially semi-cylindrical shape in which a cylinder is divided by a first dividing surface 11 and a second dividing surface 12 in the cylinder axis direction. The first divided surface 11 is located on the upper half side (one end side in the tube axis direction) of FIG. 1, and the second divided surface 12 is located on the lower half side (the other end side in the tube axis direction) of FIG. ing. The second divided surface 12 protrudes more in the circumferential direction of the cylinder than the first divided surface 11. From the upper end of the second divided surface 12 (near the middle in the cylinder axis direction of the inorganic fiber molded body 10), the engagement convex portion 13 extends toward the upper end side (the one end side) of the inorganic fiber molded body 10. The engagement concave portion 14 is formed between the engagement convex portion 13 and the first divided surface 11.

  One engagement convex portion 13 is provided on each of one side portion and the other side portion of one inorganic fiber molded body 10, and each engagement convex portion 13 is directed in the same direction (upward direction in FIG. 1). doing.

  In this embodiment, as clearly shown in FIG. 2, the dividing surfaces 11 and 12 are oblique to the radial direction D of the cylinder. The crossing angle θ between the divided surfaces 11 and 12 and the radial direction D is preferably about 5 to 85 °, particularly about 15 to 45 °.

The length of the engagement convex portion 13 in the cylinder axis direction (depth of the engagement recess 14 in the direction of cylinder axis) L ₁ is 5 to 50 of the length L ₀ of the inorganic fiber molded body 10 in the cylinder axis direction. %, And preferably about 10 to 30%.

  As shown in FIG. 3, two inorganic fiber molded bodies 10 are engaged to form a cylindrical heat insulating material. One of the two inorganic fiber molded bodies 10 and 10 (right inorganic fiber molded body 10 in FIG. 3) is upside down with respect to the other (left inorganic fiber molded body 10 in FIG. 3). And the engagement convex part 13 of the right inorganic fiber molded object 10 is engaging with the engagement recessed part 14 of the left inorganic fiber molded object 10 from the upper direction. The upper and lower end surfaces and the lower end surfaces of the left and right inorganic fiber molded bodies 10, 10 are flush with each other.

When the right inorganic fiber molded body 10 is engaged with the left inorganic fiber molded body 10, the right inorganic fiber molded body 10 is positioned at least _one L1 higher than the left inorganic fiber molded body 10, and the right inorganic fiber molded body 10 is placed. The second divided surface 12 is brought into contact with or close to the first divided surface 11 of the left-side inorganic fiber molded body 10, and the right-side inorganic fiber molded body 10 is lowered to engage the engaging convex portion 13 and the engaging concave portion 14 with each other. Let

For this reason, if there is a space of L ₁ or more above the left inorganic fiber molded body 10, the right inorganic fiber molded body 10 can be engaged with the left inorganic fiber molded body 10. Therefore, the inorganic fiber molded body 10 can be applied even in a situation where the top and bottom of the pipe and the like are closed. When the inorganic fiber molded body is flexible, the right-side inorganic fiber molded body 10 is moved substantially horizontally, and the engagement convex portion 13 is elastically bent to engage with the engagement concave portion 14. it can. In this case, even when there is no space above the left inorganic fiber molded body 10, the right inorganic fiber molded body 10 can be engaged with the left inorganic fiber molded body 10 for construction.

  In addition, an inorganic fiber molded object can also be cut | disconnected short according to a field dimension, and can also be mounted | worn with a pipe etc. The construction may be performed using a plurality of types of inorganic fiber molded bodies having different lengths.

  In the state of FIG. 3, the engagement convex portion 13 of the right inorganic fiber molded body 10 overlaps with the engagement concave portion 14 of the left inorganic fiber molded body 10 from the upper side. The movement in the direction is restricted, and the vertical displacement between the two is prevented. Moreover, since the engaging convex part 13 has entered into the engaging concave part 14, separation of the left and right inorganic fiber molded bodies 10, 10 is also prevented. Further, in this embodiment, since the dividing surfaces 11 and 12 are oblique to the radial direction D, the overlapping area of the dividing surfaces 11 and 12 is large, and heat radiation from the mating surfaces is also small.

  In the inorganic fiber molded body 10 of FIGS. 1 to 3, the engaging convex portion 13 has an acute angle shape with a sharp tip, and the bottom of the engaging concave portion 14 has the same acute angle shape. As shown in FIG. 4A, the tip of the engaging projection 13A and the bottom of the engaging recess 14 may be rounded. 4 is the same as that of the inorganic fiber molded body 10 shown in FIGS. 1 to 3, and the same reference numerals denote the same parts.

  In the said embodiment, although the engagement convex part and the engagement recessed part are each provided in both the one side and parallel side which are parallel to the cylinder axis direction of the inorganic fiber molded object 10 and 10A, respectively, only one side is provided. An engaging convex part and an engaging concave part may be provided. However, as shown in FIGS. 1 to 4, an engaging convex portion and an engaging concave portion are provided on both sides, respectively, and the engaging portion composed of the engaging convex portion and the engaging concave portion is arranged in the cylinder axis direction of the inorganic fiber molded body. By disposing in the middle, it is possible to form a cylindrical body by engaging inorganic fiber molded bodies having the same shape on the left and right.

  In the present invention, as in the inorganic fiber molded bodies 10B and 10B ′ in FIGS. 7 and 8, the engaging portion composed of the engaging convex portion 13 and the engaging concave portion 14 is arranged in the direction of the cylinder axis of the inorganic fiber molded body 10B. It is good also as a left-right non-identical shape by arrange | positioning in places other than an intermediate | middle.

In the above embodiment, the crossing angle θ between the dividing surface 11 and the radial direction D is shown to be equal to the crossing angle θ between the dividing surface 12 and the radial direction D, but the inorganic fiber molded body 10C shown in FIG. , as in the 10C ', the intersection angle theta ₁ between divided surface 11 and the radial direction may be different from the crossing angle theta ₂ between the divided surfaces 12 and the radial direction D.

  In the above embodiment, the left-side inorganic fiber molded body and the right-side inorganic fiber molded body have the same circumferential length, but like the inorganic fiber molded bodies 10D and 10D ′ in FIG. The circumferential length of one inorganic fiber molded body 10D may be smaller than the circumferential length of the other inorganic fiber molded body 10D ′.

  FIGS. 9A and 10A are plan views of the inorganic fiber molded bodies 10C and 10C ′ and 10D and 10D ′ separated from each other, and FIGS. 9B and 10B. ) Is a plan view of a cylindrical heat insulating material combining them.

  In the embodiment described above, one set of the engaging convex portion and the engaging concave portion is provided on each of the one side and the other side of the inorganic fiber molded bodies 10 to 10D ′, but two or more sets may be provided.

  In the said embodiment, although the engagement convex part of each edge | side of an inorganic fiber molded object is mutually made the same direction, it is good also as a reverse direction.

  In the above embodiment, when a pair of inorganic fiber molded bodies are combined, a cylindrical heat insulating material is formed as shown in FIGS. 3, 4, 8, 9 (b) and 10 (b). It is good also considering the inorganic fiber molded object as the division | segmentation shape of a square tube so that material may be formed.

  When combining the inorganic fiber molded bodies to form a cylindrical body, the mating surfaces may be bonded together with mortar, an adhesive, or the like.

  The cylindrical body formed by combining the inorganic fiber molded bodies may have its inner peripheral surface in close contact with the outer peripheral surface of a member such as a pipe, and there may be a gap between the outer peripheral surface. A wool-like heat insulating material may be interposed between the outer peripheral surface and the inner peripheral surface.

  The method for producing the inorganic fiber molded body of the present invention is not particularly limited. In the inorganic fiber molded body of FIGS. 1 to 4 and 7 to 10, a needle blanket is used as the inorganic fiber aggregate for the substantially cylindrical member to be protected (pipe or the like), and this is simply set to a desired thickness. It can be manufactured by impregnating a layer or a laminate obtained by laminating a plurality of layers, forming a cylindrical shape, heating and drying, and then cutting into the obtained cylindrical molded body. You may bake a molded object.

  In this manufacturing method, the maximum surface direction of the needle blanket may be used as the same direction as the circumferential surface direction of the member to be protected.

  In this way, by making the maximum surface direction of the needle blanket of the inorganic fiber molded body the same direction as the circumferential surface direction of the protected member, it is possible to manufacture a heat insulating material without punching the inorganic fiber molded body. It is possible to reduce loss such as uncut parts. In addition, the needle blanket is generally elongated because the inorganic fiber aggregate obtained by accumulating inorganic fibers on a belt conveyor or the like is subjected to a needling process. Therefore, an inorganic fiber molded body having an arbitrary length can be produced according to the length of the protected member in the column axis direction.

  In the production of the inorganic fiber molded body, any sol type and impregnation amount can be selected. By laminating the needle blanket of the inorganic fiber molded body in the same direction as the surface direction of the member to be protected, the sol impregnation amount can be easily inclined in the circumferential direction of the protection member. As a result, scale resistance on the exposed side, heat insulation performance improvement on the inner periphery and weight adjustment are facilitated, and the application range is expanded.

  For example, the slope of the impregnated sol distribution in the inorganic fiber molded body increases the amount of sol impregnation toward the outside, or impregnates the inorganic sol only in the vicinity of the surface, so that the outer peripheral side, which is the exposed side, is scale resistant. It is possible to secure a large number of voids, which are heat insulating layers, and to improve the heat insulating effect.

  It is preferable that the inorganic fiber has an average fiber diameter of 5 to 7 μm and does not substantially contain a fiber having a fiber diameter of 3 μm or less.

  The inorganic fiber is preferably a polycrystalline alumina / silica fiber containing 65 to 98% by mass of alumina and 2 to 35% by mass of silica.

  The inorganic sol preferably contains one or more selected from the group consisting of alumina, spinel, zirconia, magnesia, titania, calcia, and a material having the same composition as the inorganic fiber.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

Polycrystalline alumina / silica-based fibers containing 72% by mass of alumina and 28% by mass of silica, which have an average fiber diameter of 5.5 μm and do not substantially contain fibers having a fiber diameter of 3 μm or less, are accumulated and needled. The needle blanket (trade name: Mitsubishi Resin MAFTEC MLS, thickness 25 mm, bulk density 130 kg / m ³ ) is processed into a width 200 mm and a length 600 mm, and an inorganic sol (trade name: Nissan Chemical Alumina Sol-200) is 20 kg / m. ^The needle blanket was impregnated at a ratio of ² , and the needle blanket was fixed in a semicylindrical shape along the longitudinal direction of a cylindrical iron plate having a diameter of 300 mm. Then, after drying for 12 hours in the dryer, the portion where the needle blanket is joined is subjected to a cutting process corresponding to the engaging convex part and the engaging concave part as shown in FIGS. A cylindrical inorganic fiber molded body was obtained. Then, another similar operation was performed to obtain a similar inorganic fiber molded body.

  When two inorganic fiber molded bodies are combined, a cylindrical heat insulating material having an inner diameter of 300 mm and a height of 200 mm shown in FIG. 3 is obtained.

  This inorganic fiber molded body could be fitted from right and left to a cylinder having a diameter of 300 mm that was closed at the top and bottom.

10, 10A, 10B, 10B ′, 10C, 10C ′, 10D, 10D ′ Inorganic fiber molded body 11 First divided surface 12 Second divided surface 13, 13A Engaging convex portion 14, 14A Engaging concave portion

Claims (7)

An inorganic fiber molded body obtained by impregnating an inorganic sol into an inorganic fiber needle blanket and drying it,
The cylindrical body has a divided cylindrical shape that is divided into a plurality of parts by a dividing surface in the cylindrical axis direction,
In a state where a plurality of inorganic fiber molded bodies are combined to form a cylindrical body, an engagement convex portion and an engagement concave portion for preventing separation of the inorganic fiber molded bodies are each of the inorganic fiber molded bodies. In the inorganic fiber molded body provided on the dividing surface,
The dividing surface has a first dividing surface on one end side in the cylinder axis direction and a second dividing surface on the other end side,
The engaging convex portion extends from the second split surface to the one end side, and the engaging concave portion is formed between the engaging convex portion and the first split surface. Molded body.   2. The inorganic fiber molded body according to claim 1, wherein the engagement convex portion on one side of the inorganic fiber molded body and the engagement convex portion on the other side are oriented in the same direction.   3. The inorganic fiber molded body according to claim 1, wherein the dividing surface is oblique to the radial direction of the cylindrical body.   The inorganic fiber molded body according to any one of claims 1 to 3, wherein the inorganic fiber has an average fiber diameter of 5 to 7 µm and does not substantially contain fibers having a fiber diameter of 3 µm or less.   The inorganic fiber according to any one of claims 1 to 4, wherein the inorganic fiber is a polycrystalline alumina / silica-based fiber containing 65 to 98% by mass of alumina and 2 to 35% by mass of silica. Molded body.   The inorganic sol according to any one of claims 1 to 5, wherein the inorganic sol is selected from the group consisting of alumina, spinel, zirconia, magnesia, titania, calcia, and a material having the same composition as the inorganic fiber. An inorganic fiber molded article containing more than seeds.   The heat insulating material which consists of an inorganic fiber molded object of any one of Claim 1 thru | or 6.

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