JP2001146993A - High temperature expansion joint for duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent fracture of a non-metallic bellows. SOLUTION: This joint is comprised by constituting it so that a temperature rise of the non-metallic bellows 8 is suppressed by a temperature rise suppressing means 11 (3e, 4e, 9, and 10) using cooling fluid for maintaining a temperature of the non-metallic bellows 8 at service temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature expansion joint for a duct for connecting a duct for guiding a high-temperature fluid, and more particularly to a high-temperature expansion joint for a duct having a non-metallic bellows.

[0002]

2. Description of the Related Art Conventionally, high-temperature gas (high-temperature fluid) exhausted from, for example, a gas turbine or the like is guided to an exhaust gas boiler via a duct. Since these ducts undergo thermal expansion and contraction due to the high-temperature gas passing therethrough, the ducts are connected to each other via a duct high-temperature expansion joint.

[0003] As this high-temperature expansion joint for ducts, one having a non-metallic bellows is known. The high temperature expansion joint for ducts having a nonmetallic bellows includes a first connection member made of metal connected to the upstream duct at one end, and a second connection member made of metal connected to the downstream duct at one end. A non-metallic bellows connected to both ends of the first and second connecting members and made of, for example, rubber or Teflon for absorbing thermal expansion and contraction of the upstream and downstream ducts; And a heat insulating material filled in a space defined by the first and second connecting members. The non-metallic bellows absorbs thermal expansion and contraction between the ducts, while the heat insulating material The configuration is such that heat transfer on the duct side to the non-metallic bellows is suppressed. Further, a non-metallic bellows and a connecting member made of the above-described metal that transmits heat on the duct side to the non-metallic bellows,
It is cooled by natural air cooling.

[0004]

The above-mentioned non-metallic bellows is generally made by impregnating a material capable of withstanding large bending such as glass fiber with a rubber material such as silicon rubber in order to impart airtightness. However, such a rubbery material can withstand even the highest temperatures at present.
About 00 ° C. is a practical limit.

In recent years, the temperature of exhaust gas passing through the high-temperature expansion joints for ducts has reached about 500 ° C. to about 650 ° C. with the rise in temperature of gas turbines, and particularly in recent years. In the above, among the above temperature ranges, those having higher temperatures are increasing.

Therefore, the above-mentioned heat insulating material and natural air cooling have a problem that the temperature of the non-metallic bellows rises to a temperature outside the range of use, and the non-metallic bellows is deteriorated and damaged. Such a problem becomes more remarkable because the effect of natural air cooling cannot be expected when the external atmosphere temperature is high.

When the high-temperature expansion joint for a duct is an expansion joint having a metal bellows, there is a problem that the reaction force against the displacement of the duct is large, and a large metal bellow is required to absorb the displacement. There are problems such as becoming.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and in a high-temperature expansion joint for a duct having a nonmetallic bellows, the temperature of the nonmetallic bellows is maintained at a temperature in a use range, and the nonmetallic bellows is maintained. An object of the present invention is to provide a high-temperature expansion joint for ducts that can prevent breakage of bellows.

[0009]

A high-temperature expansion joint for a duct according to the present invention is a high-temperature expansion joint for a duct for connecting a duct for guiding a high-temperature fluid, the first high-temperature expansion joint including a first connecting member connected at one end to an upstream duct. A second connecting member connected at one end to the downstream duct; and a non-metallic member connected to both other ends of the first and second connecting members to absorb thermal expansion and contraction of the upstream and downstream ducts. Bellows, temperature rise suppression means for suppressing the temperature rise of the non-metallic bellows using a cooling fluid,
Was provided.

According to such a high-temperature expansion joint for ducts according to the present invention, the temperature rise of the non-metallic bellows is suppressed by the temperature rise suppressing means using the cooling fluid, and the temperature of the non-metallic bellows is reduced to the operating range temperature. Is maintained.

Here, as the temperature rise suppressing means, for example, a cooling means for directly cooling the non-metal bellows from the inside or outside thereof with a cooling fluid may be employed.

Preferably, the cooling fluid is used as cooling air, and the cooling air is blown out inside the non-metallic bellows to directly cool the non-metallic bellows.

When such a configuration is adopted, the non-metallic bellows are directly received by the cooling air blown out inside the non-metallic bellows and are expanded outward, so that the outward bending is favorably maintained. While absorbing the thermal expansion and contraction of the ducts. For this reason, abnormal deformation of the non-metallic bellows, such as inward bending which may occur in the non-metallic bellows by repeating the operation of absorbing the thermal expansion and contraction of the ducts, is prevented.

Further, as the temperature rise suppressing means, for example, a heat transfer suppressing means for cooling the first and second connecting members from inside or outside thereof with a cooling fluid to suppress heat transfer to the non-metallic bellows may be used. Can be adopted.

Preferably, the cooling fluid is used as cooling air, and the cooling air is blown out inside the first and second connecting members to suppress heat transfer to the non-metallic bellows.

When such a configuration is adopted, the non-metallic bellows are inflated outward by indirectly receiving the cooling air blown out inside the first and second connecting members, and are curved outward. Absorbs thermal expansion and contraction between the ducts while maintaining good conditions. For this reason, abnormal deformation of the non-metallic bellows, such as inward bending which may occur in the non-metallic bellows by repeating the operation of absorbing the thermal expansion and contraction of the ducts, is prevented.

It is preferable that the cooling fluid cools the non-metallic bellows-side portions of the first and second connecting members to suppress heat transfer to the non-metallic bellows.

When such a configuration is adopted, the non-metallic bellows-side portions of the first and second connecting members, that is, the portions of the connecting members having a particularly low temperature are cooled by the cooling fluid. The temperature is uniformly reduced between the duct side portion and the non-metal bellows side portion of the member. For this reason, the internal thermal stress of the connecting member is reduced.

If the space defined by the non-metallic bellows and the first and second connecting members is filled with a heat insulating material, the heat insulating material suppresses heat transfer on the duct side to the non-metallic bellows. Therefore, a rise in the temperature of the non-metallic bellows is further suppressed, and the temperature of the non-metallic bellows is further maintained at the operating range temperature.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a high-temperature expansion joint for a duct according to the present invention will be described below with reference to the accompanying drawings. In each of the drawings, the same elements are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a longitudinal sectional view showing a high-temperature expansion joint for a duct according to the first embodiment. This high-temperature expansion joint for a duct connects exhaust ducts 2a and 2b as a passage for guiding a high-temperature gas (high-temperature fluid) of about 500 ° C. to about 650 ° C. exhausted from a gas turbine to an exhaust gas boiler. The first connecting member 3 is connected to the upstream duct 2a, the second connecting member 4 is connected to the downstream duct 2b, and the first and second connecting members 3 and 4 are connected to a non-metal bellows. The connection is made by a reference numeral 8.

The first connecting member 3 is made of metal and has a substantially hollow frustoconical side wall 3a, a flange 3b provided annularly on the small diameter side (left side in the figure) of the side wall 3a, and a large side wall 3a. A flange portion 3c provided annularly on the radial side,
And the flange portion 3b on the small diameter side is airtightly connected to the upstream duct 2a.

The second connecting member 4 has the same structure as the first connecting member 3 and is made of metal and has a substantially hollow truncated conical side wall 4a, and is provided annularly on the small diameter side of the side wall 4a. And a flange 4c provided annularly on the large diameter side of the side wall 4a. The second connecting member 4 is disposed so that the large diameter side faces the first connecting member 3, and the small diameter side flange portion 4b is connected to the downstream duct 2b with airtightness.

The flange portions 3c, 4c of the first and second connecting members 3, 4 are connected via an annular non-metallic bellows 8. That is, the flange portion 3c of the first connection member 3 and one end side (left side in the drawing) of the non-metallic bellows 8 are connected with airtightness, and the flange portion 4 of the second connection member 4 is connected.
c and the other end of the non-metallic bellows 8 are connected with airtightness.

The non-metallic bellows 8 is made of a flexible material such as rubber or Teflon, and is formed so that its central portion in the axial direction is curved outward (swells).
The structure is configured to absorb thermal expansion and contraction between the ducts 2a and 2b and to prevent the internal high-temperature gas from permeating to the outside. This non-metallic bellows 8 has a thickness of about 6 mm to 8 mm, and has a heat resistant temperature of about 200 ° C.

The side wall 3 of the first and second connecting members 3 and 4
On the smaller diameter sides of the first and second connecting members 3 and 4, annular sleeves 3d and 4d made of metal projecting toward the inner side of the side walls 3a and 4a so as to surround the axis of the first and second connecting members 3 and 4.
Are connected in series. These sleeves 3d and 4d are formed by laminating thin plates of, for example, SUS, and have flexibility and duct 2
An annular connecting sleeve 5 that allows thermal expansion and contraction between a and 2b
Are linked by

An annular space is defined by the non-metal bellows 8, the first and second connecting members 3, 4, and the connecting sleeve 5, and the space is filled with, for example, a felt-like heat insulating material 6.

The flange portion 3b of the first connecting member 3
In order to guide the high-temperature gas flowing in the duct well downstream, an annular flow guide 7 extending downstream with a predetermined gap to the connecting sleeve 5 is provided.
Is attached.

In particular, in the present embodiment, there is provided a means for suppressing a rise in temperature of the non-metal bellows 8 using cooling air (cooling fluid). The temperature rise suppressing means is a cooling means 11 for directly cooling the non-metal bellows 8 from the inside by cooling air. Hereinafter, the cooling means 11 as the temperature rise suppressing means will be described in detail.

Each of the flange portions 3c and 4c of the first and second connecting members 3 and 4 has a plurality of thick portions formed along the circumferential direction, and the non-metal bellows 8 are formed on these thick portions. Through holes 3e and 4e are provided to communicate the vicinity of the inside and the outside. The inside portions of these through holes 3e and 4e are formed so as to be directed to the inside portions of the non-metallic bellows 8, respectively.

A pipe 9 to which cooling air is supplied is connected to the through hole 3 e of the first connecting member 3, and the second connecting member 4
The through hole 4e has a pipe 10 for discharging internal air.
Is connected. Therefore, the through hole 3e corresponds to a cooling air supply passage, and the through hole 4e corresponds to an internal air discharge passage.
As the cooling air supplied through the pipe 9, for example, low-pressure ventilation of a gas turbine, bearing seal air, or the like is branched and used. For this reason, a special cooling air supply source is not required, and cost reduction is achieved. It is needless to say that a cooling air supply source may be separately provided to supply cooling air.

Next, the operation of the high-temperature expansion joint for a duct having the cooling means 11 will be described. When the high-temperature gas flows through the duct, the ducts 2a and 2b thermally expand, so that the non-metallic bellows 8 is pressed from both sides and greatly curved outward to absorb the thermal expansion of the ducts 2a and 2b. On the other hand, when the flow of the high-temperature gas is stopped, the ducts 2a and 2b are thermally contracted, so that the non-metallic bellows 8 is pulled to both sides and is slightly curved outward (the curvature is reduced).
Absorb heat shrinkage of a and 2b.

Here, in the present embodiment, when the high-temperature gas flows in the duct, the cooling air is supplied through the pipe 9 and the cooling air supply passage 3e. At this time, since the inner part of the cooling air supply passage 3e is directed to the inner part of the non-metallic bellows 8, the cooling air is
Flows downstream along the inner portion of the bellows to directly cool the non-metallic bellows 8. Here, since a large number of cooling air supply passages 3e are provided along the circumferential direction as described above,
The cooling air cools the entire circumference of the non-metal bellows 8 almost completely. Then, this air is discharged to the pipe 10 via the internal air discharge passage 4e.

As described above, since the non-metallic bellows 8 is directly cooled by the cooling air, the temperature rise of the non-metallic bellows 8, which was impossible with the action of the heat insulating material and natural air cooling, is suppressed.
The temperature of the non-metallic bellows 8 is maintained at a use range temperature. According to the forced cooling of the non-metallic bellows 8 by the cooling air, the temperature of the non-metallic bellows 8 is sufficiently maintained at the operating temperature even when the external atmosphere temperature is high.

Conventionally, when the non-metallic bellows 8 repeats the operation of absorbing the thermal expansion and contraction between the ducts 2a and 2b, that is, when the degree of the outward bending of the non-metallic bellows 8 is repeatedly changed. The non-metallic bellows 8
There is a possibility that the central portion in the axial direction may be bent inward to cause abnormal deformation, but in the present embodiment, the cooling air blown out inside the nonmetallic bellows 8 causes the nonmetallic bellows 8 to expand outward. , The non-metallic bellows 8 maintain the good outward curvature thereof while maintaining the ducts 2a, 2b.
Absorption of thermal expansion and contraction between them prevents abnormal deformation of the non-metallic bellows 8 as described above.

FIG. 2 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a second embodiment. The high-temperature expansion joint for a duct of the second embodiment is different from that of the first embodiment in that the cooling means 11 for directly cooling the non-metal bellows 8 from the inside thereof by cooling air is replaced with cooling air by first and second cooling air. The heat transfer suppressing means 12 for cooling the side walls 3a and 4a of the second connecting members 3 and 4 from outside thereof to suppress heat transfer to the non-metallic bellows 8 is used, and the non-metallic bellows 8 is cooled by cooling air. This is the point that a cooling means 15 for directly cooling from above is used. The heat transfer suppressing means 12 and the cooling means 15 are respectively arranged outside (the area filled with the heat insulating material 6 is inside) with the connecting members 3 and 4 and the non-metallic bellows 8 as boundaries.

The heat transfer suppressing means 12 is connected to the first connecting member 3.
A heat transfer suppressing means 13 corresponding to the side wall 3a of the second connecting member 4, a heat transfer suppressing means 14 corresponding to the side wall 4a of the second connecting member 4,
Consists of These heat transfer suppressing means 13 and 14
Are provided along the side walls 3a, 4a, and have annular cooling air pipes 13a, 14a, respectively. In the cooling air pipes 13a and 14a, cooling air blowing holes 13b and 14b are opened at positions facing the side walls 3a and 4a, respectively.
The cooling air blowing holes 13b and 14b are
In order to cool the entire circumference of a and 4a almost completely, a large number are arranged side by side in the circumferential direction. This large number of cooling air blowing holes 13
The cooling air pipes 13a and 14a having b and 14b are attached to the flange portions 3c and 4c of the first and second connecting members 3 and 4 via the supporting members 13c and 14c, respectively.

The cooling means 15 includes a cooling air pipe 15a which is provided along the non-metallic bellows 8 and forms an annular shape. The cooling air pipe 15a is provided with a cooling air blowing hole 15b at a position facing the non-metal bellows 8, and the cooling air blowing hole 15b is provided to cool the entire circumference of the non-metal bellows 8 almost completely. A large number are juxtaposed along the direction. The cooling air pipe 15a provided with the large number of cooling air blowing holes 15b is attached to the flange portion 3c side of the first connecting member 3 via the supporting member 15c.

As the high-temperature gas flows through the duct, cooling air is supplied to these cooling air pipes 13a, 14a and 15a.

According to the high-temperature expansion joint for a duct constructed as described above, the cooling air supplied to the cooling air pipes 13a and 14a respectively flows toward the side walls 3a and 4a via the cooling air blowing holes 13b and 14b. Be blown out. As a result, the side walls 3a and 4a are cooled over substantially the entire circumference, respectively, and the heat transfer to the non-metallic bellows 8 is suppressed, and the temperature rise of the non-metallic bellows 8 is suppressed.

The cooling air supplied to the cooling air pipe 15a is blown toward the non-metallic bellows 8 through the cooling air blowing hole 15b. As a result, the non-metal bellows 8 is directly cooled over substantially the entire circumference, and the temperature rise of the non-metal bellows 8 is suppressed.

Therefore, the heat transfer suppressing means 12 and the cooling means 1
3 is cooling air (cooling fluid) as in the cooling means 11
Corresponds to a temperature rise suppressing means for suppressing a temperature rise of the non-metallic bellows 8.

As described above, since the temperature rise of the non-metallic bellows 8 is suppressed, the temperature of the non-metallic bellows 8 is maintained at the operating range temperature.

In this embodiment, the heat transfer suppressing means 12 and the cooling means 15 are provided side by side. However, only one of them may be provided, or both may be provided and used properly. You may do it.

FIGS. 3 to 8 show still another embodiment. In these embodiments, a cooling means as a temperature rise suppressing means for suppressing the temperature rise of the non-metal bellows 8 by using a cooling fluid. And the structure of the heat transfer suppressing means is different.

FIG. 3 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a third embodiment. The high-temperature expansion joint for ducts of the third embodiment is different from that of the first embodiment in that the configuration of the cooling means for directly cooling the non-metal bellows 8 from the inside thereof with cooling air is changed.

That is, the cooling means 18 of this embodiment is
An annular cooling air pipe 18a is provided along the non-metallic bellows 8 in an inner area filled with the heat insulating material 6 and has an annular shape. In the cooling air pipe 18a, a cooling air blowing hole 18b is opened at a position facing the non-metal bellows 8. A plurality (three in this embodiment) of cooling air blowing holes 18b are arranged from the upstream side to the downstream side in order to cool the entire width (left and right directions in the drawing) of the non-metallic bellows 8 almost completely. These cooling air blowing holes 18b
In order to cool the entire circumference of the non-metal bellows 8 almost completely, a number of them are arranged side by side in the circumferential direction.

The cooling air supply pipe 18c to which the cooling air is supplied as the high-temperature gas flows through the duct is provided in the cooling air pipe 18a having the plurality of cooling air blowing holes 18b.
Is connected. Further, an internal air discharge passage (not shown) similar to that of the first embodiment is provided in, for example, at least one of the flange portions 3c and 4c.

According to the duct high-temperature expansion joint having such a configuration, when the cooling air is supplied to the cooling air pipe 18a through the cooling air supply pipe 18c, the cooling air flows through the cooling air blowing hole 18b. Is blown out toward the non-metallic bellows 8. As a result, the non-metal bellows 8 is directly cooled over substantially the entire width and the entire circumference, and is expanded outward by the cooling air.

Therefore, substantially the same effects as in the first embodiment,
That is, it is possible to obtain an effect that the temperature rise of the non-metallic bellows 8 is suppressed, the temperature of the non-metallic bellows 8 is maintained at the operating range temperature, and the abnormal deformation of the non-metallic bellows 8 is prevented. .

In addition, the cooling air is supplied to the non-metal bellows 8.
Non-metallic bellows 8
An air curtain that cuts off the air from the hot gas side is formed. For this reason, the temperature rise of the non-metallic bellows 8 is further suppressed, and the temperature of the non-metallic bellows 8 is further maintained at the operating range temperature.

FIG. 4 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a fourth embodiment. The high-temperature expansion joint for ducts of the fourth embodiment is different from that of the second embodiment in that the side walls 3a, 4a of the first and second connecting members 3, 4 are cooled from outside by cooling air. Instead of the heat transfer suppressing means 12 for suppressing the heat transfer to the bellows 8 respectively,
The point is that the heat transfer suppressing means 19 for cooling the side walls 3a and 4a from the inside by the cooling air to suppress the heat transfer to the non-metal bellows 8 is used. This heat transfer suppressing means 19
In particular, the portions of the side walls 3a and 4a on the side of the non-metallic bellows 8 are each cooled.

That is, the heat transfer suppressing means 19 is disposed in the internal region filled with the heat insulating material 6, and corresponds to the side wall 3 a of the first connecting member 3, and the second heat transfer suppressing means 20.
Transfer suppression means 21 corresponding to side wall 4a of connecting member 4 of FIG.
And These heat transfer suppressing means 20, 2
Numeral 1 includes cooling air pipes 20a and 21a which are provided along side portions of the side walls 3a and 4a on the side of the non-metallic bellows 8 to form annular cooling air pipes 20a and 21a, respectively. The cooling air pipes 20a and 21a are provided with cooling air blowing holes 20b and 21b at positions facing the non-metal bellows 8 side portions of the side walls 3a and 4a, that is, portions near the flange portions 3c and 4c of the side walls 3a and 4a, respectively. A large number of cooling air blowing holes 20b and 21b are provided along the circumferential direction so as to cool almost the entire circumference of the nonmetallic bellows 8 side portions of the side walls 3a and 4a. The cooling air pipes 20a, 21a provided with the large number of cooling air blowing holes 20b, 21b are provided with cooling air supply pipes 20c, 20c to which cooling air is supplied as the high-temperature gas flows in the duct.
21c are respectively connected. Further, an internal air discharge passage (not shown) similar to that of the first embodiment is provided with, for example, a flange portion 3c,
4c.

According to the duct high-temperature expansion joint constructed as described above, when the cooling air is supplied to the cooling air pipes 20a and 21a via the cooling air supply pipes 20c and 21c, the cooling air is cooled. Air blowing holes 20b, 21
B is blown out toward the non-metallic bellows 8 side portions of the side walls 3a and 4a via b. Thereby, the side walls 3a, 4a
Are cooled over substantially the entire circumference, and heat transfer to the non-metal bellows 8 is suppressed. As a result, the temperature rise of the non-metallic bellows 8 is suppressed, and the temperature of the non-metallic bellows 8 is maintained at the operating range temperature.

In the present embodiment, in particular, the side walls 3a, 4
a of the side walls 3a and 4a, that is, portions of the side walls 3a and 4a that are particularly low in temperature are cooled, so that the duct side portions (small diameter side portions) of the side walls 3a and 4a and the non-metal bellows 8 side portions ( The temperature is uniformly lowered between the side walls 3a and 4a, and the internal thermal stress of the side walls 3a and 4a is reduced. For this reason, breakage of the side walls 3a and 4a is prevented.

Further, the cooling air blowing holes 20b, 21b
Each of the cooling air blown out comes into contact with the nonmetallic bellows 8 side portions of the side walls 3a and 4a, and the nonmetallic bellows 8 is formed.
And toward the high-temperature gas side. The cooling air flowing toward the inner part of the non-metallic bellows 8 causes the non-metallic bellows 8 to expand outward,
The occurrence of abnormal deformation of the non-metallic bellows 8 is prevented.

On the other hand, the cooling air flowing toward the high-temperature gas side forms an air curtain for shutting off the non-metallic bellows 8 and the high-temperature gas side. Is further maintained at the operating range temperature.

FIG. 5 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a fifth embodiment. The difference between the high-temperature expansion joint for ducts of the fifth embodiment and that of the third embodiment is that the configuration of the cooling means for directly cooling the non-metal bellows 8 from the inside thereof with cooling air is changed.

That is, the cooling means 22 of the present embodiment comprises:
An annular perforated cloth which is arranged in the inner region so as to overlap the non-metallic bellows 8, one end of which is fixed to the flange 3 c of the first connecting member 3, and the other end of which is fixed to the flange 4 c of the second connecting member 4. 22c. The porous cloth 22c is a cloth having flexibility and no airtightness.
And the thickness is substantially the same. The non-metal bellows 8 is connected to a cooling air supply pipe 22a that connects the inside and the outside. The cooling air is supplied to the cooling air supply pipe 22a as the high-temperature gas flows in the duct. Also,
An internal air discharge passage (not shown) similar to that of the first embodiment is provided in, for example, at least one of the flange portions 3c and 4c.

According to the high temperature expansion joint for a duct configured as described above, the cooling air supplied through the cooling air supply pipe 22a is introduced between the non-metal bellows 8 and the porous cloth 22c. Due to this air pressure, the porous cloth 22c is curved inward as shown, and a cooling air flow path 22d through which cooling air flows is formed between the non-metal bellows 8 and the porous cloth 22c in an annular shape. By the cooling air flowing through the cooling air passage 22d, the non-metal bellows 8 is directly cooled over the entire circumference and is expanded outward. Further, the cooling air flow path 2
The cooling air of 2d goes to the hot gas side through the porous cloth 22c, and forms an air curtain that blocks the non-metallic bellows 8 from the hot gas side. Therefore, substantially the same effects as in the third embodiment can be obtained.

FIG. 6 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to the sixth embodiment, and FIG. 7 is a sectional developed view taken along line AA of FIG. The difference between the high-temperature expansion joint for ducts of the sixth embodiment and that of the fourth embodiment is that the non-metallic bellows 8 side portions of the side walls 3a, 4a are cooled from the inside by the cooling air to generate heat to the non-metallic bellows 8. Instead of the heat transfer suppressing means 19 for suppressing the respective transmissions, the non-metallic bellows 8 side portions of the side walls 3a, 4a are cooled from the inside thereof by the cooling water (cooling fluid), and the heat transfer to the non-metallic bellows 8 is respectively performed. The point is that the heat transfer suppressing means 23 for suppressing is used. That is, the cooling fluid is changed to cooling water instead of cooling air, and the configuration of the heat transfer suppressing means is changed in accordance with this change.

The heat transfer suppressing means 23 is disposed in the internal region filled with the heat insulating material 6, and corresponds to the heat transfer suppressing means 24 corresponding to the side wall 3 a of the first connecting member 3 and the second connecting member 4. And heat transfer suppressing means 25 corresponding to side wall 4a. These heat transfer suppressing means 24 and 25 are continuously provided along the inner side of the non-metallic bellows 8 side portions of the side walls 3 and 4 (the portions near the flange portions 3c and 4c of the side walls 3a and 4a) to form an annular shape. Water cooling jacket forming walls 24a, 25
a. The water cooling jacket forming walls 24a, 2
Each of the water cooling jackets 5a has a substantially semicircular shape in longitudinal section, and the water cooling jacket forming walls 24a, 25a and the nonmetallic bellows 8 side portions of the side walls 3, 4 form a water cooling jacket 24c having a substantially semicircular longitudinal section. , 25c are each defined annularly.

The water cooling jackets 24c and 25c have
As the high-temperature gas flows through the duct, the cooling water supply pipes 24b and 25b to which the cooling water is supplied are respectively connected. As shown in FIG. 7, a cooling water drain pipe 25d for draining the cooling water flowing through the water cooling jacket 25c to the outside is connected to the water cooling jacket 25c. The cooling water drain pipe 25d is arranged close to the cooling water supply pipe 25b. The water cooling jacket 25c also has a partition plate 2 between a connection port side to the cooling water supply pipe 25b and a connection port side to the cooling water drain pipe 25d.
The cooling water supplied from the cooling water supply pipe 25b is supplied to the water cooling jacket 25 by the partition plate 25e.
The cooling water is drained from the cooling water drain pipe 25d after flowing all around c. The water cooling jacket 24c is also connected to a cooling water drainage pipe and provided with a partition plate, similarly to the water cooling jacket 25c.

As shown in FIG. 7, the water cooling jacket forming walls 24a, 25a and the non-metallic bellows 8 of the side walls 3, 4 are formed.
Protrusions that make the water-cooling jackets 24c and 25c into a labyrinth shape are respectively formed on the side portions.

According to the high temperature expansion joint for a duct constructed as described above, when the cooling water is supplied to the water cooling jackets 24c, 25c via the cooling water supply pipes 24b, 25b, the cooling water is supplied to the water cooling jacket 24c. , 25c, and the non-metallic bellows 8 side portions of the side walls 3 and 4 (side walls 3a and 3c).
4a is cooled particularly over the entire circumference.

Therefore, the heat transfer to the non-metallic bellows 8 is suppressed, the temperature rise of the non-metallic bellows 8 is suppressed, the temperature of the non-metallic bellows 8 is maintained at the operating range temperature, and the side walls 3a, Duct side part 4a and non-metal bellows 8
The temperature is uniformly lowered between the side portions and the side walls 3a,
The internal thermal stress of each of the side walls 3a, 4a is reduced.
Is prevented from being broken.

FIG. 8 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to the seventh embodiment. The difference between the high temperature expansion joint for ducts of the seventh embodiment and that of the sixth embodiment is that the non-metallic bellows 8 side portions of the side walls 3a and 4a are cooled from the inside by the cooling water and the heat to the non-metallic bellows 8 is generated. Instead of the heat transfer suppressing means 23 for suppressing the transfer of heat, the heat transfer suppressing means for cooling the portions of the side walls 3a and 4a on the non-metallic bellows 8 side from outside thereof with cooling water to thereby suppress the heat transfer to the non-metallic bellows 8 respectively. The point is that the means 26 is used. That is, the water cooling jackets are arranged outside the non-metal bellows 8 side portions of the side walls 3a and 4a.

The heat transfer suppressing means 26 includes the first connecting member 3
A heat transfer suppressing means 27 corresponding to the side wall 3a of the second connecting member 4, a heat transfer suppressing means 28 corresponding to the side wall 4a of the second connecting member 4,
Consists of These heat transfer suppressing means 27, 28
Are the non-metal bellows 8 side portions of the side walls 3 and 4 and the flange portion 3
c and 4c, both ends of which are connected to the non-metal bellows 8 side portions of the side walls 3 and 4 and the flange portions 3c and 4c, respectively, so as to close the space between the outside and the outside, thereby forming an annular water cooling. Water cooling jackets 27c, 28c each having a substantially triangular cross section are provided by the water cooling jacket forming walls 27a, 28a, the non-metal bellows 8 side portions of the side walls 3, 4 and the flange portions 3c, 4c. Are each defined in a ring shape.

The water cooling jackets 27c and 28c include:
As the high-temperature gas flows in the duct, the cooling water supply pipes 27b and 28b to which the cooling water is supplied are connected. Further, similarly to the sixth embodiment, the water cooling jackets 27c and 28c are provided with a cooling water drainage pipe, a partition plate, and the like, not shown, respectively.

Even with this configuration, the non-metallic bellows 8 side portions of the side walls 3 and 4 are cooled over the entire circumference, so that the same operation and effect as in the sixth embodiment can be obtained. Soon, in addition, the water-cooled jacket 27c, 2
Since the water-cooling jacket forming walls 27a and 28a defining the 8c can be retrofitted, there is an advantage that the manufacturing is easier than in the sixth embodiment.

Although the present invention has been specifically described based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the fluid passing through the ducts 2a and 2b may be used. Is a high temperature gas, but may be a high temperature liquid, for example.

In the above embodiment, the cooling fluid is cooling air or cooling water.
As long as the first and second connecting members 3 and 4 can be cooled, another fluid may be used. For example, lubricating oil or the like may be used instead of the cooling water.

Further, in the above embodiment, an example of application to the ducts 2a and 2b connecting the gas turbine and the exhaust gas boiler is described. However, the present invention is not limited to this. Applicable.

[0074]

The high-temperature expansion joint for ducts according to the present invention comprises:
Since the temperature rise of the non-metallic bellows is suppressed by the temperature rise suppressing means using the cooling fluid and the temperature of the non-metallic bellows is maintained at the operating range temperature, damage of the non-metallic bellows is prevented. This can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a high-temperature expansion joint for a duct according to a first embodiment.

FIG. 2 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a second embodiment.

FIG. 3 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a third embodiment.

FIG. 4 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a fourth embodiment.

FIG. 5 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a fifth embodiment.

FIG. 6 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a sixth embodiment.

FIG. 7 is a sectional development view taken along the line AA of FIG. 6;

FIG. 8 is a semi-longitudinal sectional view showing a high-temperature expansion joint for a duct according to a seventh embodiment.

[Explanation of symbols]

2a: upstream duct, 2b: downstream duct, 3: first connecting member, 3a: side wall of the first connecting member, 3b: small-diameter side flange portion of the first connecting member (one end of the first connecting member) Side), 3c... Large-diameter-side flange portion of the first connecting member (first
, A second connecting member, 4a, a side wall of the second connecting member, 4b, a small-diameter-side flange portion of the second connecting member (one end of the second connecting member), 4c: Large-diameter flange portion of the second connecting member (the other end of the second connecting member), 6: Heat insulating material, 8: Non-metallic bellows, 11, 15, 1
8, 22 ... cooling means (temperature rise suppressing means), 12, 1
9, 23, 26: heat transfer suppressing means (temperature rise suppressing means).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshiyuki Morii 2-1-1, Shinhama, Araimachi, Takasago City, Hyogo Prefecture Inside the Takasago Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Yukio Endo Ichibancho, Aoba-ku, Sendai City, Miyagi Prefecture No. 7-1, Tohoku Electric Power Co., Inc. (72) Noboru Yamada, Inventor No. 155, 1-1-1, Higashiko, Seiro-cho, Kitakanbara-gun, Niigata Pref.Tohoku Electric Power Co., Inc.Higashi-Niigata Thermal Power Station (72) Inventor, Kazunori Chiba 1-1-1, Higashiko, Higashiko, Serogyo-cho, Gunma F-term (reference) 3G004 AA00 BA00 BA05 DA01 DA11 DA14 DA22 EA00 EA05 EA06 FA08 3H104 JA08 JB01 JC04 JC08 JD02 LB01 LB36 LG02 MA10

Claims (7)

[Claims] 1. A high-temperature expansion joint for a duct for connecting a duct for guiding a high-temperature fluid, comprising: a first connection member connected to an upstream duct at one end; and a second connection member connected to a downstream duct at one end. A connecting member, connected to both ends of the first and second connecting members,
A high-temperature expansion joint for a duct, comprising: a non-metallic bellows that absorbs thermal expansion and contraction of the upstream and downstream ducts; and a temperature rise suppression unit that suppresses a temperature rise of the non-metallic bellows using a cooling fluid. 2. A high-temperature expansion joint for a duct according to claim 1, wherein said temperature rise suppressing means is cooling means for directly cooling said non-metal bellows from inside or outside thereof by said cooling fluid. 3. The cooling fluid is cooling air,
The high-temperature expansion joint for a duct according to claim 2, wherein the cooling air is blown out inside the non-metallic bellows to directly cool the non-metallic bellows. 4. The heat transfer suppressing means for cooling the first and second connecting members from inside or outside thereof by the cooling fluid to suppress heat transfer to the non-metallic bellows. The high-temperature expansion joint for ducts according to claim 1, wherein 5. The cooling fluid is cooling air,
The high-temperature expansion joint for a duct according to claim 4, wherein the cooling air is blown out inside the first and second connection members to suppress heat transfer to the non-metallic bellows. 6. The cooling fluid according to claim 4, wherein said cooling fluid cools said non-metallic bellows-side portions of said first and second connecting members, thereby suppressing heat transfer to said non-metallic bellows. Or the high temperature expansion joint for ducts according to 5. 7. The high-temperature expansion and contraction for a duct according to claim 1, wherein a heat insulating material is filled in a space defined by the non-metallic bellows and the first and second connecting members. Fittings.