JP5886252B2 - Repair method of ceramic fiber lining - Google Patents

Description

  The present invention relates to a method for repairing a ceramic fiber lining used in furnace equipment for the purpose of heating, firing and the like.

Conventionally, as a method for repairing a ceramic fiber lining, a method of repairing with a ceramic fiber (inorganic fiber) spraying material after applying an indefinite member to a deteriorated damaged portion (concave portion) of a ceramic fiber block and flattening it is known. (See Patent Document 1).
There is also known a method of stitching a blanket covered on a damaged portion of a ceramic fiber block with a ceramic fiber rope (see Patent Document 2).

JP 2001-304768 A JP 2005-055010 A

However, in the method disclosed in Patent Document 1, since the ceramic fiber spraying, glazing, and the like contain a lot of moisture during construction, there is a risk of dropping due to its own weight, strength reduction during drying, dropping due to drying shrinkage, etc. It was happening.
Further, in the method disclosed in Patent Document 2, it is difficult to sew deeper than a predetermined depth (specifically, 100 mm) from the surface of the ceramic fiber block, and the ceramic fiber block is deteriorated. There has been a problem that it is difficult to fix the portion where the strength is maintained without being damaged.
Therefore, the present invention can be easily restored to the original heat insulation and fire resistance without performing a large-scale repair work such as replacing a deteriorated ceramic fiber block based on the above-described conventional technology. It aims at providing the repair method of ceramic fiber lining.

The features of the present invention will be described below using the embodiments of the present invention shown in the drawings.
In addition, a code | symbol shows the code | symbol used in embodiment of this invention, and does not limit the technical scope of this invention.
The present invention is a method for repairing a ceramic fiber lining in which a ceramic fiber block 20 is lined on a part or all of a furnace wall, and a damaged portion 21 generated on the surface of the ceramic fiber block 20 due to thermal deterioration, or heat A joint opening 22 formed between adjacent ceramic fiber blocks 20 due to deterioration or heat shrinkage is filled with a ceramic fiber or crystalline ceramic fiber made of the same material as the ceramic fiber block 20 and flattened, and the ceramic fiber or crystal is formed thereon. overmolded quality ceramic blanket 32, from the surface of the blanket 32, the temperature of thermal degradation is calculated based on the thermal conductivity of the material of the surface temperature and the ceramic fiber blocks 20 of the ceramic fiber block 20 during use of the furnace After forming the insertion hole 24 extending to the ceramic fiber block 20 inside the depth does not reach the starting temperature, secure the blanket 32 by inserting a heat-resistant rod member 33 to the insertion hole 24 from the surface of the blanket 32 (heat pin 34) It is characterized by doing.

  According to the present invention, there is provided a method for repairing a ceramic fiber lining that can be easily restored to the original heat insulation and fire resistance without performing a large-scale repair work such as replacing a deteriorated ceramic fiber block. Can do.

It is an embodiment of the present invention, and is a schematic diagram showing a part of a heating furnace lined with a ceramic fiber block. It is embodiment of this invention, Comprising: It is explanatory drawing which shows the content of the repair work of a ceramic fiber lining. It is an embodiment of the present invention and is a diagram showing a specific example of a heat-resistant pin. It is an embodiment of the present invention, and is a diagram showing a specific example of an aspect of a method for covering a blanket. It is an embodiment of the present invention, and is a diagram showing a specific example of an aspect of a method for covering a blanket.

Embodiments of the present invention will be described with reference to the drawings.
Here, the repair method of the ceramic fiber lining will be described by taking the heating furnace 1 with the ceramic fiber block 20 lined as an example.
The heating furnace 1 in the present embodiment is formed by lining a plurality of ceramic fiber blocks 20 on a casing 10 made of iron skin and a heat-insulating back material 11 laid on the surface of the casing 10. .
In this embodiment, the ceramic fiber block 20 to be lined is made of an amorphous ceramic fiber. The material of the ceramic fiber block 20 may be a crystalline ceramic fiber instead of an amorphous ceramic fiber.
The ceramic fiber block 20 begins to thermally deteriorate from the surface to which a heat load is applied due to long-term use of the heating furnace 1, and a damaged portion 21 in which a crack or the like is generated on the surface of the ceramic fiber block 20 is generated or heat shrinkage occurs. As a result, a joint opening 22 where joint opening or block cracking occurs between adjacent ceramic fiber blocks 20 occurs (see FIG. 1).

In order to repair the damaged portion 21 and the joint opening portion 22, first, a base work is performed.
Specifically, as shown in FIG. 2, first, a joint reinforcing agent or an amorphous ceramic fiber made of the same material as the ceramic fiber block 20 is applied to the damaged portion 21 and the joint opening portion 22 by an extruder such as a caulking gun. Alternatively, the surface is flattened by filling with a filler 30 such as an amorphous material that contains crystalline ceramic fibers and hardens.
In this way, by filling the joint opening portion 22 with the filler 30 such as the joint reinforcing agent or the amorphous material, it is possible to stabilize the ceramic fiber block 20 that has been loosened due to heat shrinkage or the like.

Further, the damaged portion 21 and the joint opening portion 22 are filled with the filler 30 as described above, and a cotton-like member made of an amorphous ceramic fiber or a crystal is formed in a portion close to the surface where the heat deterioration has progressed. The surface may be flattened by filling a bulk 31 made of high quality ceramic fiber.
In addition, when the ceramic fiber block 20 is uneven due to thermal degradation more than cracks and block cracks, the surface of the ceramic fiber block 20 is filled with the above-described bulk 31 or scraped off the convex portions. It is desirable to flatten.
By performing such a base work, cracks generated in the ceramic fiber block 20 and gaps (joint openings) generated between the plurality of ceramic fiber blocks 20 are filled, so that heat convection is generated in the cracks and gaps. It can be prevented from occurring. Thereby, since progress of thermal deterioration can be prevented, the effect of the repair by fixing the blanket 32 mentioned later can be heightened more.

And after performing the above-mentioned foundation work, it is made of a non-crystalline ceramic fiber formed in a cloth shape over the surface of one lined ceramic fiber block 20 or the surface of a plurality of ceramic fiber blocks 20 or A blanket 32 made of crystalline ceramic is covered.
It is desirable to use a blanket 32 having high density and good tensile strength. Specifically, a known material having a bulk density of about 60 kg to 200 kg per cubic meter can be used. The thickness of the blanket 32 is preferably about 4 mm to 50 mm so as to withstand its own weight.

And as above-mentioned, after covering the blanket 32 on the surface of the ceramic fiber block 20, this blanket 32 is fixed.
Specifically, the heat-resistant pin 34 as the heat-resistant rod-shaped member 33 is connected to the non-deteriorated portion 23 without thermal deterioration in the ceramic fiber block 20 so as to penetrate the blanket 32 covered with the ceramic fiber block 20 in the thickness direction. By inserting, the blanket 32 is fixed to the surface of the ceramic fiber block 20.
In the above-described fixing operation, first, the ceramic fiber block 20 that fixes the heat-resistant pin 34 is deep enough so that the heat-resistant pin 34 inserted from the top (surface) of the blanket 32 reaches the non-deteriorated portion 23 of the ceramic fiber block 20. The insertion hole 24 is formed. Then, a heat-resistant inorganic adhesive (not shown) is injected into the insertion hole 24 by an extruder such as a caulking gun. Thereafter, the heat-resistant pin 34 is inserted into the insertion hole 24 and bonded with a heat-resistant inorganic adhesive, whereby the blanket 32 is fixed to the surface of the ceramic fiber block 20.

The depth of the insertion hole 24 (that is, the depth from the surface of the ceramic fiber block 20 to the non-degraded portion 23) is the temperature in the heating furnace 1 (surface temperature of the ceramic fiber block 20) and the ceramic used. It can be calculated based on the thermal conductivity of the material of the fiber block 20.
That is, based on the temperature in the heating furnace 1 and the above-described thermal conductivity, the temperature reached at a predetermined depth position of the ceramic fiber block 20 can be calculated by using the heating furnace 1. Here, since the temperature at which thermal degradation starts is determined by the material of the ceramic fiber block 20, thermal degradation does not occur at a depth in the ceramic fiber block 20 that does not reach the temperature at which thermal degradation begins. Can be estimated. Thereby, the depth of the insertion hole 24 (depth from the surface of the ceramic fiber block 20 to the non-degraded portion 23) can be calculated.

In addition, as the heat-resistant inorganic adhesive, a known adhesive suitable for bonding between ceramic fibers, such as an adhesive containing a non-crystalline ceramic fiber or a crystalline ceramic fiber, which has little drying shrinkage and heat shrinkage is used. Can do.
Moreover, as the heat-resistant pin 34 (heat-resistant rod-shaped member 33), a ceramic thing can be used, and depending on the temperature in the heating furnace 1, a metal thing can be used.
Further, the heat-resistant pin 34 is not deteriorated so that the heat-degraded portion 25 in the ceramic fiber block 20 that has undergone heat deterioration is not subjected to a large load and is firmly fixed to the non-degraded portion 23. Tip fixing portions 35 such as a return portion (see FIG. 3 (a)), a concavo-convex portion (see FIG. 3 (b)), a screwed portion (see FIG. 3 (c)), and the like are attached to the tip portion of the shaft reaching the portion 23. The provided one can be used. In addition, you may use the heat-resistant pin 34 (refer FIG.3 (d)) which does not provide the front-end | tip fixing | fixed part 35. FIG.

As a method of covering the blanket 32, various patterns can be adopted as long as the damaged portion 21 and the joint opening portion 22 are not exposed.
For example, the ceramic fiber block 20 may be covered with one blanket 32, or the ceramic fiber block 20 may be covered with a plurality of blankets 32 as shown in FIGS.
Moreover, when covering with the several blanket 32, you may arrange | position the blanket 32 so that the damage part 21 and the joint opening part 22 may be covered with the several blanket 32 (FIG. 4 (a), FIG. 5). The blanket 32 may be arranged so that the damaged portion 21 and the joint opening portion 22 are covered with the single blanket 32 (see FIG. 4B). Instead of overlapping the blankets 32, the end portions where the adjacent blankets 32 come into contact with each other may be bent in the surface direction (see FIG. 5B).

According to the repair method according to the present embodiment, all of the inner wall side (lined ceramic fiber block of the heating furnace 1) is performed without performing large-scale repair work such as disassembling and replacing the deteriorated ceramic fiber block 20. Repair can be performed from the surface side of 20).
As a result, it is possible to prevent an accident that damages the heating furnace 1 main body, the casing 10, and the like, and it is possible to restore the initial heat insulation fire resistance in a simple and short period of time.

DESCRIPTION OF SYMBOLS 1 Heating furnace 10 Casing 11 Back material 20 Ceramic fiber block 21 Damaged part 22 Joint opening part 23 Non-deterioration part 24 Insertion hole 25 Thermal degradation part 30 Filler 31 Bulk 32 Blanket 33 Heat-resistant rod-shaped member 34 Heat-resistant pin 35 Tip fixed part

Claims (1)

A ceramic fiber lining repair method in which a ceramic fiber block is lined on a part or all of a furnace wall,
A ceramic fiber or crystalline ceramic fiber of the same material as the ceramic fiber block can be used to create a damaged part on the surface of the ceramic fiber block due to thermal deterioration or a joint opening between adjacent ceramic fiber blocks due to thermal deterioration or thermal contraction. And then flatten with a blanket made of ceramic fiber or crystalline ceramic, and from the surface of the blanket to the surface temperature of the ceramic fiber block and the thermal conductivity of the ceramic fiber block material when the furnace is used. after the temperature to be calculated to form the insertion hole extending to ceramic fiber blocks inside the depth it does not reach the temperature at which the beginning of thermal degradation based blanket insert the refractory rod member in insertion hole from the surface of the blanket A method of repairing a ceramic fiber lining, characterized in that the fixing.

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