JP6287383B2 - Ceramic fiber block and in-furnace lining structure using the same - Google Patents

Description

  The present invention relates to a ceramic fiber block used as a refractory heat insulating material for an industrial furnace such as a heating furnace or a heat treatment furnace, and an in-furnace lining structure using the same.

  In order to enhance the heat insulation of industrial furnaces such as heating furnaces and heat treatment furnaces, ceramic fiber blocks (hereinafter referred to as “ceramic fibers” may be referred to as “CF” in this specification) are provided on the inner surfaces of furnace walls and ceilings. It is common practice to install them side by side in a grid pattern.

  As shown in FIG. 13, the CF block 30 includes a block body 10 that is a rectangular parallelepiped shape obtained by folding a sheet-like CF blanket into a fold shape, and a rectangular bracket in plan view for fixing the CF block 30 to the furnace inner surface. 25 and the beam member 11 inserted into the block body 10 with the tab 11a protruding from the block body 10. The metal fitting 25 is fixed to the block body 10 by inserting the tab 11a of the beam material 11 into the slit 25b formed in the metal fitting 25 and bending the portion protruding from the metal fitting 25.

There are three methods for attaching the CF block 30 to the inner surface of the industrial furnace: an inner stop method, an outer stop method, and a disk method. Here, the internal stop method will be briefly described.
As shown in FIG. 14, in the internal stop method, first, stud bolts 14 are welded at predetermined intervals to the inner surface of the iron shell 12 constituting the outer shell of the industrial furnace. Next, a CF blanket 13 having a thickness of about 25 mm is attached to the inner surface of the iron skin 12, the CF block 30 is pushed toward the CF blanket 13, and the stud bolt 14 is inserted into the bolt hole 25a formed in the metal fitting 25 of the CF block 30. Insert it. The nut 15 is screwed into the stud bolt 14 penetrating the metal fitting 25 using the box wrench 16, and the CF block 30 is fixed to the furnace inner surface.

  Note that the thickness of the CF blanket 13 as the back lining material may be different from 25 mm depending on the situation. In addition, an amorphous refractory, a refractory brick, a heat-insulating brick, a board or the like may be used in combination, but a CF blanket 13 is generally disposed on the surface in contact with the CF block 30. This is because a flexible CF blanket 13 is sandwiched between the back surface of the CF block 30 and the iron skin 12 so that no gap is formed on the back surface after the CF block 30 is attached.

  The CF blanket is a heat insulating material having a specific gravity as low as 0.2 and an excellent heat insulating property. Therefore, the block body 10 using the CF blanket has excellent characteristics of high heat insulation and low thermal inertia. Further, the beam member 11 and the metal fitting 25 are disposed on the back side of the block body 10 (opposite to the operation surface in the furnace), and are placed in a temperature environment significantly lower than the furnace atmosphere temperature. Since refractory metals are generally used, they are extremely resistant to deterioration and have excellent durability.

As described above, the CF block has very excellent characteristics, but the heat insulating property is lowered with deterioration with time. For this reason, various documents for the purpose of preventing the heat insulating property of the CF block from being lowered are disclosed.
For example, in Patent Document 1, it is assumed that the deterioration of the CF block due to use is caused by the deterioration of the CF on the operation surface side in the furnace. Specifically, in the case of a high-temperature CF block (crystalline CF block), the crystalline fiber is stiff, so that the fiber is cut at the crease, and deterioration after use is accelerated along with deterioration in workability. In the CF block for use (amorphous CF block), since the crease part is uneven, it is difficult to apply the coating material for the purpose of improving the scale resistance, and peeling of the coating material or local alteration occurs.
Therefore, Patent Document 1 discloses an invention in which the operating surface side of the CF block is cut flat and the cut surface is exposed to the in-furnace operating surface side.

Patent Document 2 describes that the conventional CF block is inferior in wind resistance and the like, so that the CF gradually peels off due to the gas flow in the heating furnace and the thickness of the CF block decreases. To solve this problem, there is a method of applying a coating material to the CF block or coating the CF block with a heat resistant cloth. It is going to be.
Therefore, Patent Document 2 discloses an invention that improves the wind speed resistance by forming a CF block using crystalline CF having an appropriate amount of alumina content.

Japanese Utility Model Publication No. 62-052895 JP 2009-115414 A

  The inventions of Patent Documents 1 and 2 suppress the deterioration of the CF by improving the shape of the working surface of the CF block and the material of the CF. That is, the inventions of Patent Documents 1 and 2 are techniques for suppressing the deterioration of the CF block with time by suppressing the deterioration of the CF, and a certain effect is recognized, but the fundamental solution has not been achieved. Further improvement of the CF block is desired.

  The present invention has been made in view of such circumstances, and provides a ceramic fiber block that can be prevented from deterioration over time as compared with the prior art and can maintain heat insulation over a long period of time, and an in-furnace lining structure using the same. The purpose is to do.

[Mechanism of deterioration of ceramic fiber block over time]
The inventors of the present application have found that the deterioration with time of the CF block is largely caused by deformation of the mounting member attached to the back surface of the CF block. Specifically, it has been discovered that high-temperature furnace atmosphere gas enters the block body from a plurality of folds of the block body, whereby the metal fitting is partially heated and distortion occurs.

Hereinafter, the mechanism by which the CF block deteriorates with time will be described.
[STEP 1] When the working surface side CF of the block body 10 exposed to the high temperature atmosphere in the industrial furnace is burned and deformed, the restoring force of the block body 10 is lost, and the shrinkage shrinks from the working surface side of the block body 10 S starts (see FIG. 1A).
[STEP 2] The sintering shrinkage S of the block body 10 proceeds, and the boundary portion between the crease portion 10a of the block body 10 (sintered shrinkage S portion of the fold portion 10a of FIG. 1B) with the adjacent crease portion 10a. ) Is increased, and the hot gas reaches the back side of the block body 10. As a result, a plurality of locations of the metal fitting 25 are locally heated H, buckling due to a local temperature difference occurs at a plurality of locations of the metal fitting 25, and the metal fitting 25 is three-dimensionally deformed (see FIG. 1B).
[STEP 3] The gap between the crease 10a of the block body 10 and the boundary with the adjacent CF block 30 is enlarged, and the ventilation of high-temperature gas is promoted (see FIG. 1C). As a result, the CF block 30 is deformed to facilitate the passage of high-temperature gas to the back surface of the metal fitting 25, and the entire block body 10 (operation surface, back surface, side surface) and the metal fitting 25 are deteriorated.
[STEP 4] Deterioration with time of the block body 10 and the metal fitting 25 becomes obvious.

  The block body 10 has a structure in which the crease portion 10a is brought into close contact with a restoring force generated when the CF blanket is laminated and compressed and elastically deformed. Therefore, when the restoring force of the block body 10 is lost due to the working surface side CF of the block body 10 being burned and deformed, the adhesion of the crease portion 10a is lowered. As a result, the crease portion 10a of the block body 10 is less air permeable (becomes more permeable) than the other CF portions.

  When the air permeability of the block body 10 is increased due to the deterioration of the CF, infiltration sites where the high-temperature gas in the furnace easily penetrates are generated at a plurality of locations in the block body 10, and the high-temperature gas in the furnace that has passed through the permeation site causes The temperature of the metal fitting 25 rises locally at a plurality of locations on the back surface (opposite the operation surface in the furnace). The metal fitting 25 is locally buckled by a stress caused by a local temperature difference and deforms three-dimensionally.

  With the three-dimensional deformation of the metal fitting 25, the block body 10 connected to the metal fitting 25 is deformed, and the gap at the boundary between the crease portion 10a of the block body 10 and the adjacent CF block 30 is enlarged. Thereby, ventilation of the high temperature gas in the furnace to the back side of the block body 10 is promoted through the crease part 10a of the block body 10 and the boundary part with the adjacent CF block 30. As a result, the deterioration of the ventilation part (side surface, back surface and internal ventilation part in addition to the operation surface of the block body 10) proceeds, the deterioration of the entire block body 10 becomes remarkable, and the deterioration of the block body 10 is confirmed by visual inspection. Is done. Moreover, ventilation to the back surface of the metal fitting 25 is promoted, the deterioration of the metal fitting 25 progresses, the heat insulating property of the in-furnace lining is lowered, and the temperature of the iron skin rises.

[Means for suppressing deterioration of ceramic fiber block over time]
Therefore, the first invention comprises a block body formed by folding a sheet-like ceramic fiber blanket in a fold-like manner, and a mounting member mounted on one surface of the block body, in which a fold portion is formed. Comprising a ceramic fiber block installed on the inner surface of an industrial furnace through the mounting member,
The mounting member includes a rectangular metal fitting in plan view, and a rod-like body extending in the long side direction of the metal fitting and arranged in one or more rows in the short side direction of the metal fitting,
Each row of rod-like bodies is composed of one or more ceramic sintered bodies having a length of 20 mm or more, and the length of each row of rod-like bodies is 60% or more of the long side length of the metal fitting 100 % Or less.

  In the first invention, since the mounting member is reinforced with a rod-shaped body made of a ceramic sintered body, even if the temperature rises locally at a plurality of locations of the mounting member, the local temperature of the mounting member Even if buckling deformation caused by the difference occurs, the three-dimensional deformation of the entire mounting member is suppressed.

  Buckling deformation due to local temperature differences occurs at the location due to local temperature rises at multiple locations on the mounting member, but the location is reinforced with a rod-shaped body made of a ceramic sintered body. In the place where it exists, a three-dimensional deformation | transformation is suppressed according to the reinforcement degree of a rod-shaped body. Therefore, when the ratio of the portions reinforced with the rod-shaped body is increased, the three-dimensional deformation of the entire mounting member is further suppressed.

The second invention is an in-furnace lining structure using the ceramic fiber block according to the first invention,
The entire space between the back surface of the contact surface of the mounting member in contact with the block body and the lining material installed on the inner surface of the industrial furnace is filled with an amorphous refractory or ceramic fiber. It is characterized by.

In the second invention, the amorphous refractory or ceramics is formed in the entire gap between the back surface (back surface) of the contact surface of the mounting member in contact with the block body and the lining material installed on the inner surface of the industrial furnace. Since the fiber is filled, the back side of the mounting member does not come into contact with the furnace atmosphere gas. Therefore, the deterioration of the attachment member can be further delayed.

  In the present invention, the deterioration with time of the ceramic fiber block can be significantly suppressed as compared with the prior art by preventing or suppressing the buckling deformation caused by the local temperature difference of the mounting member constituting the ceramic fiber block. it can. As a result, the heat insulating property of the ceramic fiber block can be maintained over a long period of time.

It is a schematic diagram for demonstrating deterioration with time of a ceramic fiber block, (A) is a state in which sintering shrinkage has begun, (B) is a state in which the metal fitting is locally heated, (C) is a gap in the crease part. Each enlarged state is shown. It is a perspective view of the ceramic fiber block which concerns on one embodiment of this invention. It is a perspective view of the member for attachment used for the ceramic fiber block. It is a perspective view of the member for attachment concerning the 1st modification. It is a perspective view of the member for attachment concerning the 2nd modification. It is a perspective view of the member for attachment concerning the 3rd modification. It is a fragmentary sectional view of the in-furnace lining structure using the ceramic fiber block concerning the embodiment. It is a fragmentary sectional view of the in-furnace lining structure using the member for attachment concerning the 3rd modification. It is a fragmentary sectional view showing the modification of the in-furnace lining structure using the member for attachment concerning the 3rd modification. It is a schematic diagram of the block body for a test used for the laboratory test and the real machine test. It is a graph which shows the relationship between the reinforcement length ratio of the rod-shaped body which comprises the member for attachment, and the deformation amount of the member for attachment. It is a graph which shows the relationship between the length of one ceramic sintered compact, and the deformation amount of the member for attachment. It is a disassembled perspective view of the conventional ceramic fiber block. It is an assembly drawing for demonstrating the method to install the conventional ceramic fiber block in a furnace.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

[Ceramic fiber block]
The shape of a ceramic fiber block (CF block) 31 according to an embodiment of the present invention is shown in FIG. The CF block 31 includes a block body 10 made of ceramic fiber (CF), a mounting member 21 for fixing the CF block 31 to the inner surface of the industrial furnace, and a beam for mounting the mounting member 21 on the block body 10. The material 11 is schematically configured.

The block body 10 is formed by folding a sheet-like ceramic fiber blanket (CF blanket) into a cuboid shape, and the length of one side of the block body 10 is about 200 mm to 600 mm. Depending on the application, the block may be a deformed block such as a trapezoid in a plan view instead of a rectangular parallelepiped.
The attachment member 21 has a rectangular shape in plan view, and is attached to one surface of the block body 10 including a plurality of crease portions 10a. In addition, the member 21 for attachment is arrange | positioned in the direction orthogonal to the crease direction of the crease | fold part 10a.

The beam member 11 for mounting the attachment member 21 to the block body 10 is substantially inverted T-shaped, and the block body 10 in a state in which a strip-like tab 11 a provided at the center projects from the block body 10. Is inserted into the fold portion 10a (valley fold portion). The mounting member 21 is fixed to the block body 10 via the beam member 11 by inserting and bending the tab 11 a protruding from the block body 10 into the slit 25 b formed in the mounting member 21.
The beam material 11 is made of a refractory metal such as SUS310S.

  The shape of the mounting member 21 is shown in FIG. The mounting member 21 according to the present embodiment extends in the long side direction of the metal fitting 25 in order to reinforce the metal fitting 25 having a rectangular shape in plan view called a channel having a C-shaped short side cross section. The rod-shaped body 27 is arranged in one or a plurality of rows (two rows in the present embodiment) in the short side direction of the metal fitting 25.

  A heat-resistant metal such as SUS310S is used for the metal fitting 25, and a bolt hole 25a is formed at the center of the surface in contact with the block body 10, and a plurality of slits 25b are formed on both sides thereof. Both edges of the long side of the metal fitting 25 are bent inward to form a recess 25c, and a rod-like body 27 is inserted therein.

The length of the long side of the mounting member 21 is preferably 50% or more of the length of one side of the block body 10 for the purpose of fixing the CF block 31 to the inner surface of the industrial furnace. The upper limit of the length of the long side of the mounting member 21 is preferably 100%, which is the length of one side of the block body 10.
On the other hand, the length of the short side of the mounting member 21 is preferably 25 mm or more because of the arrangement of a fixing jig such as a bolt for fixing the CF block 31 to the inner surface of the industrial furnace. The length of the short side of the mounting member 21 in the present embodiment is 45 mm (partially 65 mm). When the length of the short side of the mounting member 21 is ¼ or less of the length of the long side, the bending (deformation amount) of the mounting member 21 in the short side direction becomes the deformation amount in the long side direction. Since it becomes extremely small as compared with the above, reinforcement in the short side direction of the mounting member 21 can be omitted.

Each row of the rod-shaped bodies 27 is composed of one or more ceramic sintered bodies having a length of 20 mm or more. Further, the length of the rod-shaped body 27 in each row is set to 60% or more and 100% or less of the long side length of the metal fitting 25.
In the present specification, the length of one row of rod-like bodies / the length of the long side of the metal fitting may be referred to as a “reinforcing length ratio of rod-like bodies”.

  In the CF block 31, buckling deformation caused by a local temperature difference caused by local ventilation occurs at a plurality of locations of the mounting member 21. Therefore, the larger the reinforcement length ratio of the rod-shaped body 27, that is, the more the portions reinforced by the rod-shaped body 27, the more the three-dimensional deformation of the mounting member 21 due to local buckling deformation is suppressed. be able to.

FIG. 11 shows the relationship between the reinforcing length ratio of the rod-shaped body constituting the mounting member and the deformation amount of the mounting member. This test shows the results of an exposure test conducted by attaching a test CF block, which will be described later, to the ceiling of a continuous heating furnace (furnace atmosphere temperature 1280 ° C.) for six months. The material of the mounting member was SUS310S, the rod-shaped bodies were arranged in a row, and one Al ₂ O ₃ ceramic sintered body having a length of 20 mm was used. For details of the test, refer to Examples described later.
From the figure, it can be seen that when the reinforcement length ratio of the rod-shaped body is 60% or more, the deformation amount of the mounting member is 9 mm or less. It is known that when the amount of deformation of the mounting member is 9 mm or less, the gap between the folds of the CF block and the gap between the adjacent CF blocks do not expand. Therefore, the reinforcement length ratio of the rod-shaped body is set to 60% or more.
On the other hand, the upper limit of the reinforcing length ratio of the rod-shaped body is 100% because it is sufficient if the entire length in the long side direction of the mounting member can be reinforced by the rod-shaped body.

  When the long-side direction of the mounting member is reinforced by connecting a rod-shaped ceramic sintered body, the effect of suppressing the three-dimensional deformation of the mounting member by the rod-shaped body is reduced at the connecting portion. Therefore, it is preferable that one ceramic sintered body is long and the number of connecting portions is small.

FIG. 12 shows the relationship between the length of one ceramic sintered body and the amount of deformation of the mounting member. The reinforcement length ratio of the rod-shaped body was 100%, and the length of one ceramic sintered body constituting the rod-shaped body was three types of 10 mm, 20 mm, and 260 mm. Other test conditions are the same as in the test of FIG.
Although the temperature rise that causes the buckling of the mounting member is considered to be local, as shown in FIG. 12, if the length of one ceramic sintered body is 20 mm or more, the actual furnace ceiling exposure test The amount of deformation of the mounting member is 9 mm or less. Therefore, the length of one ceramic sintered body constituting the rod-shaped body is set to 20 mm or more.

The measurement of the deformation amount of the mounting member was performed according to the following procedure.
(1) Prepare a surface plate with a flat upper surface, and place a mounting member on it. At that time, the mounting member is placed on the surface plate so that the vicinity of both ends of the mounting member is grounded to the surface plate and the vicinity of the center of the mounting member floats from the surface plate.
(2) The gap between the surface plate and the mounting member is measured with a caliper, and the maximum value is taken as the amount of deformation of the mounting member.

  Further, as the cross-sectional dimension of the rod-shaped body 27, the minimum thickness may be 3 mm, and the minimum cross-sectional area may be the area of a circle having a diameter of 3 mm. The cross-sectional shape of the rod-like body can be various shapes such as a square, a circle, and an ellipse. The cross-sectional dimensions of the rod-shaped body 27 are preferably larger in thickness and cross-sectional area. However, the cross-sectional shape on the short side of the metal fitting 25, the width and depth of the recess 25c, and the dimensions of the metal fitting 25 and the stud bolt 14 are considered. The maximum dimension of the rod-shaped body 27 is limited by the above-described relationship. Usually, the rod-shaped body 27 having a maximum thickness of 6 mm and a maximum rectangular cross-sectional area of 6 mm × 15 mm is used. In the present embodiment, the cross section of the rod-shaped body 27 is a rectangular cross section of 4 mm × 7 mm.

In addition, when the temperature rises locally at a plurality of locations on the mounting member 21 and buckling due to a local temperature difference occurs at that location, strength that can suppress three-dimensional deformation of the mounting member 21 Is required for the rod-shaped body 27. Therefore, it is preferable that the ceramic sintered body used for the rod-shaped body 27 has a bending strength (stress) of 60 MPa or more at 800 ° C. according to JIS R2656 “Testing method for hot bending strength of refractory bricks and refractory bricks”. For example, an Al ₂ O ₃ ceramic sintered body mainly composed of Al ₂ O ₃ (alumina) can be used.

Next, a modified example of the mounting member will be described.
FIG. 4 shows a mounting member 22 according to a first modification. The mounting member 22 in this example includes a metal fitting 26 having a rectangular shape in plan view in which the short side cross section has an inverted Ω shape (a metal piece 26 having hooks 26c formed on both edges of the long side of the channel). The long side of the metal fitting 26 is composed of a rod-like body 27 disposed on both edges. A holding part 26d is formed at the middle part in the long side direction of the flange 26c, in order to hold the rod-like body 27, by bending the long side edge of the metal fitting 26 into an L shape. The rod-shaped body 27 is inserted into a space defined by the flange 26c and the holding portion 26d.

  The metal fitting 26 is formed of a heat-resistant metal such as SUS310S, similar to the metal fitting 25 described above, and a bolt hole 26a is formed at the center of the surface in contact with the block body 10, and a plurality of slits 26b are formed on both sides thereof. Yes.

FIG. 5 shows a mounting member 23 according to a second modification. The mounting member 23 in this example is a ceramic sintered body formed into a strip shape. A bolt hole 23a is formed at the center of the surface of the mounting member 23 that contacts the block body 10, and a plurality of slits 23b are formed on both sides thereof.
As the ceramic sintered body, like the rod-like body 27, an Al ₂ O ₃ ceramic sintered body or the like can be used.

  FIG. 6 shows a mounting member 24 according to a third modification. The mounting member 24 in this example extends in the long side direction of the metal fitting 25 in order to reinforce the metal fitting 25 having a rectangular shape in plan view with a short side cross section being C-shaped as described above. In addition, a filling material 28 made of an indeterminate refractory or ceramic fiber is filled in all the gaps inside the metal fitting 25 of the mounting member 21 composed of rod-like bodies 27 arranged in two rows in the short side direction of the metal fitting 25. It is a thing. A bolt hole 24 a is formed in the central portion of the mounting member 24.

[In-furnace lining structure using CF block]
FIG. 7 is a partial cross-sectional view of the in-furnace lining structure using the CF block 31. This lining structure is arranged in a grid pattern on the CF blanket 13 and a CF blanket 13 (an example of a lining material) having a thickness of about 25 mm attached to the inside of the iron skin 12 constituting the outer shell of the industrial furnace. And a CF block 31.

  The CF block 31 is formed by inserting a bolt (not shown) attached to the iron skin 12 through a bolt hole 25a formed in the mounting member 21 of the CF block 31 and fastening with a nut (not shown). Fixed on top.

FIG. 8 shows an in-furnace lining structure using the mounting member 24 according to the third modification. This lining structure is composed of a CF blanket 13 attached to the inside of the iron skin 12 and a CF block 32 to which a mounting member 24 is attached.
FIG. 9 shows a modification of the in-furnace lining structure using the mounting member 24. In this lining structure, a layer of a filler 29 made of an irregular refractory or CF is formed between the mounting member 24 of the CF block 32 and the CF blanket 13.

  In the in-furnace lining structure shown in FIGS. 8 and 9, the fillers 28 and 29 are filled in the entire space between the back surface of the contact surface of the metal fitting 25 in contact with the block body 10 and the CF blanket 13. Yes. At that time, in addition to the gap between the back surface of the contact surface of the metal fitting 25 and the CF blanket 13 so that the atmospheric gas in the furnace does not enter the back side of the mounting member 24, as shown in FIG. The filler 29 may be filled into the gap surrounded by the long side end face of the metal fitting 25, the block body 10 and the CF blanket 13.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the above-described embodiments, and is considered within the scope of the matters described in the claims. Other embodiments and modifications are also included. For example, in the above embodiment, the rod-shaped body is arranged only in the long side direction of the metal fitting, but the rod-like body may be arranged in the short side direction in addition to the long side direction of the metal fitting.

In order to verify the effect of the ceramic fiber block according to the present invention, a laboratory test and an actual machine test were performed.
In the laboratory test and the actual machine test, in order to simulate the entry of atmospheric gas in the furnace from the crease part of the block body, a test block body provided with a gap by sandwiching the guide pipe used for the internal stop method in the crease part is used. Produced. FIG. 10 shows a test block (dimensions: 300 mm × 300 mm × 300 mm) used for the laboratory test and the actual machine test.
For the test block body, a CF blanket (maximum operating temperature: 1400 ° C., density: 130 kg / m ³ ) used in Z-BLOK (registered trademark) manufactured by Shin Nippon Thermal Ceramic Co., Ltd. was used. .

The following six types of attachment members are mounted on the test block body.
a) Mounting member A: Fitting made of a SUS310S material with a thickness of 1 mm bent and having a short side cross-section of a C shape (long side length: 260 mm, short side length: 45 mm, thickness: 6) .5 mm) mounting member b) mounting member B: mounting member B in which the gap of mounting member A is filled with CF c) mounting member C: a rod-like body in one or both recesses of mounting member A Inserted mounting member d) Mounting member D: Mounting member C in which the gap of mounting member C is filled with CF e) Mounting member E: Band-plate-shaped ceramic sintered body (long side length: 260 mm, Mounting member consisting of short side length: 45 mm, thickness: 6.5 mm f) Mounting member F: Bracket with a short side cross-section made by bending a SUS310S material with a plate thickness of 1 mm and having a C shape (Long side length: 260 mm, short side length: 5 mm, thickness: 6.5 mm) member for mounting to fitting the rod-like body in one of the recesses of

Al ₂ O ₃ -based ceramics were used for the rod-shaped body constituting the mounting members C, D, and F and the ceramic sintered body constituting the mounting member E.
Further, the reinforcement length ratio of the rod-shaped body was three types of 54%, 62%, and 100%, and the length of one ceramic sintered body was three types of 260 mm, 20 mm, and 10 mm.

In the laboratory test, the test CF block was mounted on the ceiling of the experimental furnace, fired at 1400 ° C. for 3 hours, and then allowed to cool naturally 10 times, and the deformation of the mounting member was measured by the method described above.
In the actual machine test, a test CF block (test block body + mounting members A to F) was attached to the ceiling of a continuous heating furnace for half a year to conduct an exposure test. During that period, the furnace atmosphere temperature of the part was 1280 ° C. After the test, the test CF block was disassembled after checking whether or not the gap provided in the fold portion of the test block body was enlarged, and the deformation amount of the mounting member and the rod-shaped body was measured by the method described above.
Table 1 shows the results of using the mounting members A, B, and E that are not reinforced with the rod-shaped body, and Table 2 shows the results of using the mounting members C, D, and F reinforced with the rod-shaped body.

From these tables, the following can be understood.
The mounting member made of a ceramic sintered body had a deformation amount of 0.1 mm or less in the laboratory and actual machine tests, and no abnormality was observed in the crease portion.
-When the mounting member was only the metal fitting and the metal fitting was only filled with the filler, the deformation amount of the mounting member in the actual machine test was more than 9 mm, and the gap in the crease was enlarged.
-Mounting members with a rod-shaped body reinforcement length ratio of 60% or more and a ceramic sintered body length of 20 mm or more are deformed mounting members in laboratory and actual machine tests regardless of the number of rows of rod-shaped bodies. The amount was 9 mm or less, and no abnormality was observed in the folds.
-When the number of rows of rod-shaped bodies increases, the amount of deformation of the mounting member decreases.
-Filling the metal fittings reduces the amount of deformation of the mounting member.

A thermocouple was previously embedded in the test CF block of Comparative Example 1, and the temperature at the three points of both ends and the center of the mounting member during the firing test was measured. The maximum temperature was about 730 ° C. It was. Therefore, there is a possibility that deformation corresponding to the creep test of 3.5 kg (self weight of test CF block = 30 × 30 × 30 cm × specific gravity 0.13) occurred in the mounting member at 730 ° C. × 30 hours. there were.
Therefore, in order to determine the amount of creep deformation of the mounting member, for the mounting member of Comparative Example 1, both ends of the mounting member are supported by bricks to form a bridge, and a load of 3.5 kg is applied to the center at 730 ° C. × When a 30-hour creep test was performed, the amount of deformation of the mounting member was 1.5 mm. On the other hand, the deformation amount of the mounting member of Comparative Example 1 in the laboratory test is 4.1 mm, which is about three times the deformation amount of the creep test result.
Therefore, it was confirmed that the test results in Tables 1 and 2 were due to the time-degradation mechanism of the CF block discovered by the inventors of the present application and not creep deformation.

10: Block body, 10a: Crease part, 11: Beam material, 11a: Tab, 12: Iron skin, 13: CF blanket (Ceramic fiber blanket), 14: Stud bolt, 15: Nut, 16: Box wrench, 21, 22, 23, 24: mounting members, 25, 26: metal fittings, 23a, 24a, 25a, 26a: bolt holes, 23b, 25b, 26b: slits, 25c: recesses, 26c: scissors, 26d: holding parts, 27: Rod-shaped body, 28, 29: Filler, 30, 31, 32: CF block (ceramic fiber block)

Claims (2)

A block body formed by folding a sheet-like ceramic fiber blanket in a fold-like manner, and a mounting member formed on one surface of the block body, in which a fold portion is formed, Ceramic fiber block installed on the inner surface of an industrial furnace,
The mounting member includes a rectangular metal fitting in plan view, and a rod-like body extending in the long side direction of the metal fitting and arranged in one or more rows in the short side direction of the metal fitting,
Each row of rod-like bodies is composed of one or more ceramic sintered bodies having a length of 20 mm or more, and the length of each row of rod-like bodies is 60% or more of the long side length of the metal fitting 100 A ceramic fiber block characterized by being less than or equal to%. A furnace lining structure using the ceramic fiber block according to claim 1,
The entire space between the back surface of the contact surface of the mounting member in contact with the block body and the lining material installed on the inner surface of the industrial furnace is filled with an amorphous refractory or ceramic fiber. In-furnace lining structure using ceramic fiber block.

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