JP6696485B2 - Refractory insulation structure - Google Patents

Description

  The present invention relates to a refractory heat insulating structure such as a skid pipe arranged in a walking beam type heating furnace.

The skid pipe used in the walking beam heating furnace is exposed to the furnace atmosphere at a predetermined temperature, and is a skid made of a heat-resistant material such as heat-resistant alloy or heat-resistant ceramics on a metal tube body. Buttons are installed. A steel material such as a billet to be heated is placed on the skid button and supported by the tubular body, and is heated in this state.
Then, for the purpose of protecting the skid button and the tubular body from the ambient temperature in the furnace, the outer periphery of the tubular body is covered with a refractory material, and a cooling medium is flown into the tubular body to cool the tubular body.

On the other hand, when the cooling medium is flown into the pipe body, as a reaction thereof, there is a problem that the amount of heat in the heating furnace is taken away by the cooling medium flowing in the pipe body even though it is covered with the refractory material.
In order to solve this problem, a heat insulating skid pipe shown in Patent Document 1 has been conventionally proposed.
The heat-insulating skid pipe shown in Patent Document 1 has a heat-insulating layer made of epoxy resin, synthetic resin such as polyethylene, mortar, or heat-resistant castable on the inner surface of a tube whose outer periphery is covered with a refractory material. Is. According to the heat-insulating skid pipe disclosed in Patent Document 1, the amount of heat transferred from the heating furnace to the cooling medium can be reduced and the cooling loss heat amount can be reduced without increasing the outer diameter of the tubular body.

JP, 10-183233, A

However, the heat-insulating skid pipe disclosed in Patent Document 1 has the following problems.
That is, in the case of the heat-insulating skid pipe shown in Patent Document 1, a heat-insulating layer (epoxy resin, synthetic resin such as polyethylene, mortar, heat-insulating castable, etc.) is formed on the inner peripheral surface of the pipe before the refractory is applied to the outer periphery of the pipe. Therefore, there is a problem that the construction time for forming the heat insulating layer is long and the material cost of the heat insulating layer is required, resulting in high manufacturing cost.
Therefore, the present invention has been made to solve this conventional problem, and its purpose is to shorten the construction time for forming the heat insulating layer and to eliminate the material cost of the heat insulating layer, thus reducing the manufacturing cost. It is an object to provide an inexpensive refractory insulating structure exposed to an external gas at a predetermined temperature.

  In order to achieve the above object, a refractory heat insulating structure according to an aspect of the present invention is a refractory heat insulating structure exposed to an external gas of a predetermined temperature, the inside of a temperature different from the predetermined temperature. The gist of the present invention is to provide a pipe body through which a fluid flows and a refractory material that covers the outer periphery of the pipe body, and to provide an air layer as a heat insulating layer between the pipe body and the refractory material.

  The refractory heat insulating structure according to the present invention is a refractory heat insulating structure that is exposed to an external gas having a predetermined temperature, and a pipe in which a fluid having a temperature different from the predetermined temperature flows, Since it has a refractory that covers the outer circumference of the pipe and an air layer as a heat insulating layer is provided between the pipe body and the refractory, the construction time for forming the heat insulating layer is shortened and the material cost of the heat insulating layer is unnecessary. Thus, it is possible to provide a refractory heat insulating structure which is manufactured at low cost and which is exposed to an external gas at a predetermined temperature.

It is sectional drawing of the state which cut | disconnected the skid pipe as a refractory heat insulation structure which concerns on one Embodiment of this invention at the axis orthogonal direction. It is sectional drawing which follows the 2-2 line in FIG. It is a perspective view of the state which attached the air layer formation member and the partition member to the pipe body which comprises the skid pipe shown in FIG. FIG. 6 is a partial cross-sectional view of a skid pipe as a refractory heat insulating structure according to a reference example in a state of being axially cut. It is a figure for demonstrating the temperature state of the air layer when a pair of cracks generate | occur | produced in the refractory of the skid pipe shown in FIG. 1 and FIG. 2 at the axial direction at predetermined intervals, (A) is one crack FIG. 3B is a diagram showing how the atmosphere in the furnace flows into the small air layer from the other crack, and FIG. 6B is a graph showing the temperature state of the air layer at that time. It is a figure for demonstrating the temperature state of the air layer when a pair of cracks generate | occur | produced in the refractory of the skid pipe which remove | eliminated the partition member from the skid pipe shown in FIG. 1 and FIG. , (A) is a view showing that the furnace atmosphere flows into the air layer from the other crack, and hot air flows out from the one crack to the outside through the air layer, and (B) is the air layer between those times. It is a graph which shows the temperature state of. The test piece which has the partition member used as the object of the effect confirmation test of a partition member, and the temperature measurement site | part by a thermocouple are shown, (A) is a perspective view, (B) is a top view. The test piece which does not have the partition member used as the object of the effect confirmation test of a partition member, and the temperature measurement site | part by a thermocouple are shown, (A) is a perspective view, (B) is a top view. It is a graph which compares and shows the temperature with respect to the temperature measurement site | part of the test piece which has a partition member, and the temperature with respect to the measurement site | part of the test piece which does not have a partition member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Although a skid pipe is illustrated below as an example of the refractory heat insulating structure, the present invention is not limited to the embodiments. It should be noted that the drawings are schematic, and the dimensional relationship of each element, the ratio of each element, and the like may be different from the actual one. Even between the drawings, there may be a case where portions having different dimensional relationships or ratios are included.
1 and 2 show a skid pipe 1 as a refractory heat insulating structure according to an embodiment of the present invention. A plurality of the skid pipes 1 are connected in the axial direction, arranged in a walking beam type heating furnace (not shown), and exposed to a furnace atmosphere (external gas) G at a predetermined temperature (for example, 1200 ° C.).

The skid pipe 1 includes a cylindrical pipe body 10 in which cooling water (fluid) F having a temperature lower than the predetermined temperature flows. The tubular body 10 is made of metal, and a skid button 11 made of a heat-resistant material such as heat-resistant alloy or heat-resistant ceramics is installed on the upper portion thereof.
The skid pipe 1 is provided with a refractory material 20 that covers the outer circumference of the pipe body 12 for the purpose of protecting the skid button 11 and the pipe body 10 from the temperature of the atmosphere G in the furnace.

  Further, in the skid pipe 1, an air layer 30 as a heat insulating layer is provided between the pipe body 10 and the refractory material 20. In order to form the air layer 30, a pair of ring-shaped air layer forming members 41 are attached to the outer circumferences of both ends of the tubular body 10 in the axial direction so as to project from the outer peripheral surface of the tubular body 10. There is. As shown in FIG. 2, the refractory material 20 is installed along the periphery of the pair of air layer forming members 41, and the air layer is formed between the pipe body 10 and the refractory material 20 and between the pair of air layer forming members 41. 30 is formed. Each air layer forming member 41 is formed of a refractory material, but may be a heat resistant alloy.

By providing the air layer 30 as a heat insulating layer between the tube body 10 and the refractory material 20, the amount of heat transfer from the inside of the furnace through the refractory material 20 to the cooling water in the tube body 10 is reduced, and the cooling loss heat quantity is reduced. Can be reduced.
Since the heat insulating layer is composed of the air layer 30, there is no need to form a heat insulating layer made of epoxy resin, synthetic resin such as polyethylene, mortar, heat insulating castable or the like on the inner circumference or the outer circumference of the tubular body 10. The construction time for forming the heat insulation layer can be shortened, the material cost of the heat insulation layer can be eliminated, and the skid pipe 1 can be manufactured at low cost.

Here, in the skid pipe 100 according to the reference example shown in FIG. 4, the heat insulating material 101 is wound around the outer periphery of the pipe body 10, and the refractory material 20 is installed around the heat insulating material 101. As described above, with the structure in which the heat insulating material 101 is wound around the outer periphery of the tubular body 10 before the refractory material 20 is installed, the construction time for winding the heat insulating material 101 is long and the material cost of the heat insulating material 101 is high. Will be needed.
On the other hand, in the skid pipe 1 according to the present embodiment, since the heat insulating layer is composed of the air layer 30, it is not necessary to wind the heat insulating material around the outer periphery of the pipe body 10, and the heat insulating layer is formed. The construction time can be shortened, the material cost of the heat insulation layer can be eliminated, and the skid pipe 1 can be manufactured at low cost.

Here, as shown in FIGS. 1 to 3, the air layer 30 includes 8 × 15 = 120 small air layers 30a _{1 to} 30a ₁₅ , 30b _{1 to} 30b ₁₅ , 30c by the partition member 40 and the skid button 11. _{1 ~30c 15, 30d 1 ~30d 15} , 30e 1 ~30e 15, 30f 1 ~30f 15, 30g 1 ~30g 15 is divided, and _30h 1 _{~30h 15.} In FIG. 2, although the sign of the small air layer _{30a 1, 30a 2, 30a 14} , 30a 15 and _{30e 1, 30e 2, 30e 14} , 30e 15 have been described, a small air layer _30a 3 _{~30a 13} And the symbols 30e _{3 to} 30e ₁₃ are not described. Further, in FIG. 3, a small air layer _{30a 1, 30a 2, 30a 14} , 30a 15, 30b 1, 30b 2, 30b 14, 30b 15, 30c 1, 30c 2, 30c 14, 30c 15, 30d 1, 30d _2, although the sign of _30d 14, _{30d 15} is described, the code of a small air layer _{30a 3 ~30a 13, 30b 3 ~30b} 13, 30c 3 ~30c 13, 30d 3 ~30d 13 is not described. The small air layer _{30f 2 ~30f 15, 30g 2 ~30g} 15, and _30h 2 _{~30h 15} are not shown.

As shown in FIGS. 1 and 3, the partition member 40 extends in the axial direction of the pipe body 10, and divides the air layer 30 into small air layers 30a ₁ to ₁₅ and small air layers 30b _{1 to 1 in} the circumferential direction of the pipe body 10 _{. 15} is a circumferential first partition member 40a, which extends in the axial direction of the tubular body 12, and a circumferential second partition member 40b which divides the small air layers 30ba _1-15 and the small air layers 30c _1-15. , A circumferential third partition member 40c that extends in the axial direction of the tube body 10 and divides the small air layers 30c ₁ to ₁₅ and the small air layers 30d ₁ to _15, and extends in the axial direction of the tube body 10 to form the small air layer. The circumferential fourth partition member 40d that divides 30d ₁ to ₁₅ and the small air layers 30e ₁ to ₁₅ extends in the axial direction of the tubular body 10, and forms the small air layers 30e ₁ to ₁₅ and the small air layers 30f ₁ to ₁₅ . circumferentially fifth partition member 40e for dividing, extending in the axial direction of the tubular body 10, circumferentially sixth partition member that divides the small air layer _{30 g 1 to 15} and a small air layer _{30h 1 to 15} 40f, and A seventh circumferential partition member 40g is provided that extends in the axial direction of the tubular body 10 and divides the small air layers 30h ₁ to ₁₅ and the small air layers 30a ₁ to ₁₅ . The first to seventh partition members 40a to 40g in the circumferential direction are attached to the outer peripheral surface of the tubular body 10 at an equal pitch in the circumferential direction of the tubular body 10. The circumferential first to seventh partition members 40a to 40g are made of refractory material, but may be heat resistant alloy.
Further, in the circumferential direction of the tubular body 10, the small air layers 30f ₁ to ₁₅ and the small air layers 30g ₁ to ₁₅ are divided by the skid button 11.

Further, the partition member 40, as shown in FIGS. 2 and 3, extends in the circumferential direction of the tubular body 10, in the axial direction of the tubular body 10, a small air layer _30a. 1 to 30h ₁ small air layer _{30a. 2 to} 30h ₂ a first axial partition member 40 ₁ for dividing a similarly small air layer _30a. 2 to 30h ₂ small air layer _30a. 3 to 30h ₃ axially second partition member 40 ₂ that divides the small air layer _{30a. 3 to} 30h ₃ and the small air layer _30a. 4 to 30h ₄ axially third partition member 40 ₃ which divides the axial dividing the small air layer _30a. 4 to 30h ₄ and a small air layer _30a. 5 to 30h ₅ Axial fifth partition member 40 ₅ , which divides the fourth partition member 40 ₄ , the small air layers 30a _{5 to} 30h ₅ and the small air layers 30a _{6 to} 30h _6, and the small air layers 30a _{6 to} 30h ₆ and the small air layer 30a. _{. 7 to} 30h ₇ axially sixth partition member 40 _6, a small air layer _30a. 7 to 30h ₇ axial seventh partition member 40 ₇ which divides the small air layer _30a. 8 to 30h ₈ for dividing a small air layer _{30a. 8 to} 30h ₈ small air layer _30a. 9 to 30h ₉ axially eighth partition member 40 ₈ which divides the axial dividing the small air layer _30a. 9 to 30h ₉ and a small air layer _30a. 10 to _{30h 10} ninth partition member 40 _9, the small air layer _30a. 10 to _{30h 10} and the small air layer _30a. 11 to _{30h 11} axially tenth partition member _{40 10} that divides the small air layer _30a. 11 to _{30h 11} and the small air layer 30a _{. 12 to} 30h ₁₂ axially eleventh partition member _{40 11,} the axial direction 12 partition member _{40 12} that divides the small air layer _30a. 12 to _{30h 12} and a small air layer _30a. 13 to _{30h 13} to divide the small air layer axially to split _{30a. 13 to} 30h ₁₃ and the small air layer _30a. 14 to _{30h 14} axially 13th partitioning member _{40 13,} and small air layer _30a. 14 to _{30h 14} and the small air layer _30a. 15 to _{30h 15} to divide the The 14th partition member 40 ₁₄ is provided. The axial _first to fourteenth partition members 40 ₁ to 40 ₁₄ are attached to the outer peripheral surface of the pipe body 10 at a uniform pitch in the axial direction of the pipe body 10. The axial _first to fourteenth partition members 40 ₁ to 40 ₁₄ are made of refractory material, but may be heat-resistant alloy.

Thus, the air layer 30 is divided into a plurality of small air layers 30a _1-15 , 30b _1-15 , 30c _1-15 , 30d _1-15 , 30e _1-15 , 30f _1- by the partition member 40 and the skid button 11 _{. 15,} by dividing the _{30 g 1 to 15,} and _{30h 1 to 15,} when a portion of the refractory 20 has cracks occur breakage, also flows from the furnace atmosphere G cracks inside of the air layer 30 Thus, it is possible to prevent the temperature of the entire air layer 30 from becoming high, and to suppress a significant decrease in heat insulation performance.

The partition member 40 only needs to be able to divide the air layer 30 into at least two small air layers, and is not necessarily the first to seventh partition members 40a to 40g in the circumferential direction and the first to fourteenth partition members 40 ₁ to 40 in the axial direction. ₁₄ is an air layer 30 to 8 × 15 = 120 pieces of small air layer _30a 1 _~30a 15 _{composed, 30b 1 ~30b 15, 30c 1} ~30c 15, 30d 1 ~30d 15, 30e 1 ~30e 15, 30f _It is not necessary to divide it into _{1 to} 30f ₁₅ , 30g _{1 to} 30g ₁₅ , and 30h _{1 to} 30h ₁₅ .

FIG. 5 shows a temperature state of the air layer when a pair of cracks 20a and 20b are formed in the refractory material 20 of the skid pipe 1 shown in FIGS. 1 and 2 at a predetermined distance in the axial direction.
As shown in FIG. 5 (A), one of the cracks 20a is formed in the refractory material 20 from the outside in the small air layer 30a _{n of the} air layer 30 (the distance from the reference position in the axial direction of the tubular body 10 is a (mm)). However, it is assumed that the other crack 20b occurs from the outside to the small air layer 30a _{n + 6} (at a distance b (mm) from the reference position in the axial direction of the tubular body 10) of the air layer 30. In this case, the in-furnace atmosphere G flows into the small air layer 30a _n from one crack 20a, and the in-furnace atmosphere G flows into the small air layer 30a _{n + 6} from the other crack 20b.

Thus, as shown in FIG. 5 (B), the temperature in the small air layer 30a _n is increased to beta ° C. from alpha ° C. before cracks 20a, 20b occurs. Further, the temperature in the small air layer 30a _{n + 6} also rises from α ° C. before the cracks 20a and 20b occur to β ° C. However, a small air layer 30a _n is surrounded by an axial first n-1 dividing member 40 _n-1 and the axial first n partitioning member 40 _n in the axial direction of the tubular body 10, a circle in the circumferential direction of the tubular body 10 because it is surrounded by a circumferential first partition member 40a and the circumferential seventh partition member 40 g, the hot air flowing into the small air layer 30a _n are not flow throughout the air layer 30. Further, the small air layer 30a _{n + 6} is surrounded by the axial n + 5th partition member 40 _{n + 5} and the axial n + 6th partition member 40 _{n + 6 in the} axial direction of the tubular body 10, Since it is surrounded by the first circumferential partitioning member 40a and the seventh circumferential partitioning member 40g in the circumferential direction, the hot air that has flowed into the small air layer 30a _{n + 6} does not flow into the entire air layer 30. Absent. Therefore, according to the skid pipe 1 having the partition member 40, even if the furnace atmosphere G flows into the air layer 30 through the cracks, the temperature of the entire air layer 30 is prevented from rising to a high temperature, and the air layer 30 of a large size is prevented. It is possible to suppress a decrease in heat insulation performance.

On the other hand, in FIG. 6, a pair of cracks 20a, 20b are formed in the refractory 20 of the skid pipe 1 obtained by removing the partition member 40 from the skid pipe 1 shown in FIGS. The temperature conditions of the air layer as they occur are shown.
As shown in FIG. 6 (A), one crack 20a is generated in the refractory material 20 from the outside to the air layer 30 (at a distance (a (mm) from the reference position in the axial direction of the tubular body 10 from the reference position)) and the other crack 20a. It is assumed that the crack 20b is generated from the outside to the air layer 30 (where the distance from the reference position is b (mm) in the axial direction of the tubular body 10). In this case, as shown in FIG. 5 (A), when the furnace atmosphere G flows into the air layer 30 from the other crack 20b, hot air flows through the air layer 30 to the outside from the one crack 20a. On the contrary, when the furnace atmosphere G flows into the air layer 30 through the one crack 20a, hot air flows through the air layer 30 and flows out through the other crack 20b.

  As shown in FIG. 5 (A), when the furnace atmosphere G flows into the air layer 30 from the other crack 20b and hot air flows through the air layer 30 to the outside from the one crack 20a, the figure As shown in FIG. 6 (B), the temperature in the air layer 30 rises from α ° C. before the cracks 20a and 20b are generated to β1 ° C. at the place where the other crack 20b is opened. Then, the temperature in the air layer 30 gradually decreases toward the location where the one crack 20a is open. However, in the place where one of the cracks 20a is open, the temperature rises from α ° C before the cracks 20a and 20b occur to β2 ° C.

Therefore, in the case of the skid pipe 1 in which the partition member 40 is removed from the skid pipe 1, the temperature of the entire air layer 30 becomes higher than that of the skid pipe 1 having the partition member 40, and the heat insulation performance of the air layer 30 is slightly deteriorated. For this reason, it is preferable to divide the air layer 30 into at least two small air layers by the partition member 40.
Next, the thickness δ (see FIG. 2) of the air layer 30 is preferably larger than 0 mm and within 40 mm. When the thickness δ is 0 mm, the tubular body 10 and the refractory material 20 come into contact with each other, and the heat insulating layer is not formed. On the other hand, when the thickness δ is larger than 40 mm, forced convection occurs in the air layer 30, and it is difficult to exhibit the heat insulation performance.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, in the present embodiment, the skid pipe 1 has been described as an example of the refractory heat insulating structure, but the present invention is not limited to this, and the interior of the skid pipe is exposed to a predetermined temperature and the predetermined temperature inside. Any material can be applied as long as it has a tubular body through which a fluid having a temperature different from that flows and a refractory material covering the outer periphery of the tubular body.

Further, although the tubular body 10 is configured by a cylindrical tubular body, it may be a polygonal tubular body.
Further, what flows in the pipe body 10 is not limited to the cooling water, but may be any fluid having a temperature different from the temperature of the external gas G.
Further, the partition member 40 does not necessarily have to be provided.
Further, when the partition member 40 is provided, as described above, it is sufficient that the air layer 30 can be divided into at least two small air layers, and the first to seventh partition members 40a to 40g in the circumferential direction and the first to seventh axial directions are not necessarily required. The air layer 30 is composed of 14 partition members 40 ₁ to 40 ₁₄ and includes 8 × 15 = 120 small air layers 30a _{1 to} 30a ₁₅ , 30b _{1 to} 30b ₁₅ , 30c _{1 to} 30c ₁₅ , 30d _{1 to} 30d ₁₅ , and 30d _{1 to} 30d ₁₅ . _{30e 1 ~30e 15, 30f 1 ~30f} 15, 30g 1 ~30g 15, and need not be divided into _30h 1 _{~30h 15.}

In order to confirm the effect of the partition member, an effect confirmation test of the partition member was conducted. FIG. 7 shows a test piece having a partition member that is a target of the effect confirmation test of the partition member and a temperature measurement site by a thermocouple, and FIG. 8 shows the partition member that is the target of the effect confirmation test of the partition member. The test piece which does not have and the temperature measurement part by a thermocouple are shown.
As shown in FIGS. 7A and 7B, a test piece 50 having a partition member is a rectangular parallelepiped resin test piece body 51 having a width W of 30 mm, a height H of 30 mm and a length L of 150 mm. Further, a groove 60 having a width b of 26 mm and a depth h of 28 mm is formed over the entire length of the test piece body 51 in the longitudinal direction. As a result, the thickness t of the test piece main body 51 is 2 mm. The groove 60 of the test piece 50 is divided by the four resin partition members 52 into five small grooves 61, 62, 63, 64, 65 in the longitudinal direction. The four partition members 52 are arranged such that the partition member 52 at one end in the longitudinal direction of the test piece body 51 is arranged at a distance lc: 10 mm from the end of the test piece body 51, and the remaining three partition members 52 are long. The pitch lc is 30 mm along the direction. As a result, the test piece 50 is formed with five small grooves 61, 62, 63, 64, 65 having a length lc of 30 mm in the longitudinal direction. The upper surface of the test piece body 51 is closed by the ceramic cover 53, and the small grooves 61, 62, 63, 64, 65 form a space closed at the upper side.

Then, thermocouples T1, T2, T3, T4, T5 having temperature measuring portions M1, M2, M3, M4, M5 are installed in the respective small grooves 61, 62, 63, 64, 65. Each of the temperature measurement parts M1, M2, M3, M4, M5 is the center position of each of the small grooves 61, 62, 63, 64, 65 forming the space. Therefore, as shown in FIG. 7 (B), the pitch l of the temperature measurement parts M1, M2, M3, M4, M5 is 30 mm.
Then, as shown in FIGS. 7A and 7B, the heat source was installed on the side of the small groove 61 on the windward side, and the temperature gradient from the temperature measurement portions M1 to M5 was measured.

  On the other hand, as shown in FIGS. 8A and 8B, the test piece 50 having no partition member is a rectangular parallelepiped resin test having a width W of 30 mm, a height H of 30 mm and a length L of 150 mm. A groove 60 having a width b of 26 mm and a depth h of 28 mm is formed in the piece body 51 over the entire length of the test piece body 51 in the longitudinal direction. As a result, the thickness t of the test piece body 51 is 2 mm. The upper surface of the test piece main body 51 is closed by the ceramic cover 53, and the groove 60 forms a space whose upper part is closed.

Then, in the groove 60, thermocouples T1, T2, T3, T4, T5 having temperature measurement parts M1, M2, M3, M4, M5 are installed. The temperature measurement parts M1, M2, M3, M4, M5 are at the same positions as the temperature measurement parts M1, M2, M3, M4, M5 in the test piece 50 shown in FIGS. 7 (A) and (B). Therefore, as shown in FIG. 8 (B), the pitch 1 of the temperature measurement portions M1, M2, M3, M4, M5 is 30 mm.
Then, as shown in FIGS. 8A and 8B, the heat source is installed on the same side as the small groove 61 shown in FIGS. The temperature gradient was measured.

The test results are shown in FIG.
As a result, in comparison with the test piece 50 having no partition member shown in FIGS. 8A and 8B, the test piece 50 having the partition member shown in FIGS. It was confirmed that the temperature decrease was about 60 ° C., about 80 ° C. at the temperature measurement site M3, about 85 ° C. at the temperature measurement site M4, and about 90 ° C. at the temperature measurement site M5. From this, by installing the partition member, when cracks occur in the refractory, the effect of further suppressing the temperature rise of the entire air layer can be obtained, and it is possible to confirm a greater effect of suppressing the decrease in heat insulation performance. It came out.

1 skid pipe (refractory insulation structure)
10 tube 11 skid button 20 refractory 30 air layer _{30a 1 ~30a 15, 30b 1 ~30b} 15, 30c 1 ~30c 15, 30d 1 ~30d 15, 30e 1 ~30e 15, 30f 1 ~30f 15, 30g 1 ~30g _{15, 30h} 1 ~30h ₁₅ small air layer 40 partition member 40a~40g circumferential first to seventh partition member 40 _{1-40 14} axially first through 14 partition member 50 specimens 51 specimens body 52 Partition member 53 Ceramic cover 60 Groove 61-65 Small groove F Cooling water (fluid)
G Furnace atmosphere (external gas)

Claims (2)

A refractory heat insulating structure exposed to an external gas of a predetermined temperature,
A pipe body in which a fluid having a temperature different from the predetermined temperature flows, and a refractory material covering the outer periphery of the pipe body,
An air layer as a heat insulating layer is provided between the tube body and the refractory material ,
The air layer is formed between a pair of air layer forming members that are separate from the refractory attached to the outer periphery of both ends of the tubular body in the axial direction, and between the tubular body and the refractory. ,
A plurality of axial partition members extending in the circumferential direction of the tubular body and dividing the air layer into a plurality of small air layers in the axial direction of the tubular body; and extending in the axial direction of the tubular body. An axis of the pipe body by a partition member separate from the refractory, which is constituted by a plurality of circumferential partition members that divide the air layer into a plurality of small air layers in the circumferential direction of the pipe body. A refractory heat insulation structure characterized by being divided into a plurality of small air layers in the direction of the circumference and in the circumferential direction . The refractory heat insulating structure according to claim 1 , wherein the thickness of the air layer between the tube body and the refractory material is greater than 0 mm and within 40 mm.

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