JP3610561B2 - High temperature piping lining structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a high-temperature pipe having a bent portion, and more particularly to a lining structure for a high-temperature pipe.
[0002]
[Prior art]
For example, as illustrated in FIG. 3, a pressurized fluidized bed boiler that fluidly burns coal under pressure includes a boiler body 1, a cyclone 2, an ash cooler 3, a bed material storage container 4, and the like. It is configured to be stored in a pressure vessel 5, coal C supplied from the outside is burned in the boiler body 1, the exhaust gas is sent to the cyclone 2, and the ash removed by the cyclone 2 is removed from the ash cooler 3. The exhaust gas is cooled and returned to the boiler body 1, and the exhaust gas from which ash has been removed is supplied to an external gas turbine (not shown) through the exhaust gas pipe 7 to work (for example, drive a generator). Yes. In this figure, A and B are combustion air and a fluidized bed, and 6a, 6b, and 6c are an evaporator, a superheater, and a reheater.
[0003]
In FIG. 3, the gas exiting the cyclone 2 is high-temperature and high-pressure (for example, 860 ° C., 15 data or more), and contains fine ash that cannot be separated by the cyclone 2. For this reason, as shown in FIG. 4, the bent portion of the conventional exhaust gas pipe 7 (high-temperature pipe) keeps the pressure-resistant outer pipe 8a that receives pressure, the hot gas 9 flowing inside, and the temperature of the pressure-resistant outer pipe 8a. The internal heat insulating material 8b kept low, and the integrated liner 8c for preventing the heat insulating material from being worn by ash and the heat insulating material from being scattered by the high-temperature gas flow, and the like.
[0004]
Further, since the liner 8c is in direct contact with the high temperature gas 9, it is necessary to freely thermally deform (thermal expansion and contraction) without receiving pressure. For this reason, a gap (not shown) is provided at the connecting portion of the liner 8c so that the high temperature gas 9 slightly flows outside the liner 8c, and the bent portion of the liner 8c is shown in FIG. 4B. The liner 8c can be freely thermally deformed in the axial direction by being connected and fixed to the outer tube 8a via 8d. Note that FIG. 4B is a cross-sectional view taken along line AA in FIG.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional high-temperature piping lining structure, when the liner 8c is thermally deformed, the liner 8c is displaced not only in the axial direction but also in the radial direction as shown in FIG. In the part away from the support plate 8d), the amount of movement in the radial direction due to thermal deformation of the bent part is added, so the displacement in the radial direction (upward in the B part) increases, and (1) the heat insulating material hits the heat insulating material strongly. 8b is broken and the gap between the heat insulating materials is enlarged, or (2) the gap between the heat insulating material 8b and the liner 8c is partially enlarged to reduce the heat insulating performance of the portion, thereby the metal of the pressure-resistant outer tube 8a. When the temperature is partially increased or (3) and the gap between the heat insulating materials 8b is expanded, the high-temperature gas 9 reaches the pressure-resistant outer tube 8a, partially overheats the pressure-resistant outer tube 8a, and the allowable stress is increased. It ’s drastically reduced. , ▲ 4 ▼ if such insulation in castable, cracking and particles is likely to be scattered to the gas turbine damage to the turbine blades, there problems like is.
[0006]
The present invention has been developed to solve such problems. That is, the object of the present invention is that the liner can be freely thermally deformed in the axial direction and the radial direction without being affected by the bent portion, and the gap formed around the liner is small and substantially uniform in the circumferential direction. An object of the present invention is to provide a lining structure for a high-temperature pipe that can keep the heat-retaining performance of an internal heat-retaining material almost uniformly in each part and that does not easily cause cracking or breakage of the heat-retaining material.
[0007]
[Means for Solving the Problems]
According to the present invention, a pressure-resistant outer tube that receives an internal pressure, an inner heat insulating material that is attached to the inner surface of the pressure-resistant outer tube and that keeps high-temperature gas flowing inside to lower the temperature of the pressure-resistant outer tube, and an inner heat insulating material And a liner that prevents scattering and wear of the heat insulating material due to the high-temperature gas, and a support fitting that fixes the liner to the pressure-resistant outer tube, and the bent portion of the pressure-resistant outer tube has at least one end surface with respect to the center line. It consists of a plurality of cylindrical outer tube pieces whose end surfaces inclined at an angle are connected to each other, thereby forming a bent portion of the pressure-resistant outer tube, and the liner is arranged concentrically with each outer tube piece, and each outer tube piece The support metal fitting is joined to one end of an adjacent liner piece and concentrically surrounds the other end so as to be movable in the axial direction. A plurality of support rings and an inner end fixed to the support rings By extending obliquely radially outward, and a plurality of support plates the outer end is fixed to the inner surface of the pressure-resistant outer pipe, made of the lining structure of high-temperature pipe is provided, characterized in that.
[0008]
According to a preferred embodiment of the present invention, the support ring comprises a pair of rings concentrically surrounding the ends of adjacent liner pieces, the rings being joined together. Moreover, it is preferable that the internal heat insulating material is a fibrous material having compressibility.
[0009]
[Action]
According to the configuration of the present invention described above, the bent portion of the pressure-resistant outer tube is formed of a plurality of cylindrical outer tube pieces whose end surfaces inclined obliquely with respect to the center line are connected to each other. Consists of a plurality of cylindrical liner pieces arranged concentrically with the pipe pieces and having both end faces parallel to both end faces of each outer pipe piece, so that both end parts of each liner piece are near the end face of each outer pipe piece Can be positioned.
[0010]
Further, the inner ends of the plurality of support plates are fixed to the respective support rings, the support plates extend obliquely outward in the radial direction, and the outer ends of the support plates are fixed to the inner surface of the pressure-resistant outer tube. The support ring can be positioned at the same distance from the inner surface of the outer tube piece and in the vicinity of the end surface of the outer tube piece while allowing the displacement of the support ring in the radial direction by the bending in the radial direction. Furthermore, since the support plate and each liner piece are at substantially the same temperature, their radial thermal displacement is almost the same, and the liner can be freely thermally deformed in the radial direction without being affected by the bent portion. it can.
[0011]
Also, since the plurality of support rings are joined to one end of each adjacent liner piece and the other end is concentrically surrounded so as to be movable in the axial direction, one end of each liner piece is adjacent to each other during thermal deformation. The other end can be thermally expanded in the axial direction inside the other support ring while being fixed to one support ring, thereby allowing the liner to be freely thermally deformed in the axial direction without being affected by the bent portion. Can be made.
[0012]
Therefore, each support ring is positioned near the end face of the outer tube piece at the same interval from the inner surface of the outer tube piece by a plurality of support plates, so that the gap that can be formed around the liner is small and substantially uniform in the circumferential direction. Yes, the heat retention performance of the internal heat retaining material can be maintained almost uniformly in each part. In addition, since the gaps around the liner are uniform and small, deformation of the heat insulating material can be minimized, and in particular, by using a fibrous internal heat insulating material having compressibility, almost no cracks and breakage are eliminated. be able to.
[0013]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and used for the common part in each figure.
1A and 1B are diagrams showing a lining structure of a high-temperature pipe according to the present invention, in which FIG. 1A is a side cross-sectional view, and FIG. 1B is a cross-sectional view taken along line CC in FIG. FIG. 2 is an enlarged view of a portion D in FIG.
[0014]
1 and 2, the high-temperature piping lining structure of the present invention has a pressure-resistant outer tube 12 that receives internal pressure, an internal heat retaining material 14 attached to the inner surface of the pressure-resistant outer tube 12, and an inner heat retaining material 14 inside. The liner 16 is configured to prevent the heat insulating material 9 from being scattered and worn by the high-temperature gas 9, and the support fitting 18 is used to fix the liner 16 to the pressure-resistant outer tube 12.
[0015]
The bent portion of the pressure-resistant outer tube 12 is composed of a plurality of cylindrical outer tube pieces 12a, 12b, 12c, and 12d that are connected to each other at the end faces of a, b, and c in FIG. At least one end surface a, b, c of each outer tube piece 12a-d is inclined with respect to the center line ZZ, thereby forming a bent portion of the pressure-resistant outer tube.
[0016]
The internal heat insulating material 14 has a function of keeping the high temperature gas 9 flowing inside to lower the temperature of the pressure resistant outer tube 12. The internal heat insulating material 14 is attached to the inner surface of the pressure-resistant outer tube 12 with a substantially fixed thickness by an appropriate mounting bracket (for example, a stud bolt). The internal heat insulating material 14 is preferably a fibrous material that can withstand a high temperature of, for example, 1000 ° C. or more and has compressibility, and is preferably a ceramic fiber, for example. By using the internal heat insulating material 14, the gap formed around the liner 16 by thermal deformation can be eliminated by the restoring force of the internal heat insulating material 14, and the expansion and damage of the internal heat insulating material 14 due to deformation are almost eliminated. be able to.
[0017]
Further, in FIG. 1, the liner 16 includes a plurality of cylindrical liner pieces 16a, 16b, 16c, and 16d. Each liner piece 16a-d is concentrically arranged corresponding to each outer tube piece 12a-d, and has both end faces 17a, 17b substantially parallel to both end faces of each outer tube piece 12a-d. . With this configuration, both end surfaces 17a and 17b of each liner piece can be positioned near the end surfaces of the outer tube pieces 12a to 12d.
[0018]
The support fitting 18 includes a plurality of support rings 19 and a plurality of support plates 20. As shown in FIG. 2, the support ring 19 is joined to one end portion 17b of the adjacent liner piece by welding or the like, and concentrically surrounds the other end portion 17a of the liner piece so as to be movable in the axial direction. That is, the support ring 19 is composed of a pair of rings 19a and 19b joined to each other by welding, and each ring 19a and 19b concentrically surrounds the end portions 17a and 17b of the adjacent liner pieces. 17b and ring 19b are welded together. With this configuration, one end portion 17b of each liner piece can be thermally expanded in the axial direction inside the other support ring 19 while the one end portion 17b of each liner piece is fixed to the adjacent one support ring 19 during thermal deformation. Thus, the liner pieces 16a to 16d can be freely thermally deformed in the axial direction without being affected by the bent portion.
[0019]
As shown in FIG. 1B, the support plate 20 has an inner end 20a fixed to the support ring 19 and extends obliquely outward in the radial direction, and the outer end 19b is fixed to the inner surface of the pressure-resistant outer tube 12. ing. With this configuration, while allowing the radial displacement of the support ring 19 due to the radial deflection of the support plate 20, the support ring 19 is spaced from the inner surfaces of the outer tube pieces 12a to 12d by the same distance, and the outer tube pieces 12a to 12a. It can be positioned near the end face of d. Further, since the support plate 20 and the liner pieces 16a to 16d are at substantially the same temperature, their radial thermal displacement amounts are almost the same, and the liner pieces 16a to 16d are not affected by the bent portions. It can be thermally deformed freely in the direction.
[0020]
Accordingly, each support ring 19 is positioned in the vicinity of the end face of the outer tube piece at the same interval from the inner surface of the outer tube piece 12a to d by the plurality of support plates 20, so that each liner piece is the outer tube piece 12a to 12a. It only extends in the axial direction while maintaining concentricity with d, and the gaps formed around each of the liner pieces 16a to 16d are small and substantially uniform in the circumferential direction. As a result, the heat insulation performance of the internal heat insulating material 14 can be maintained almost uniformly in each part, and since the gaps formed around the liner 16 are uniform and small, deformation of the heat insulating material can be minimized, and in particular, compression By using a fibrous internal heat insulating material having the property, it is possible to almost eliminate gap expansion and breakage between the heat insulating materials.
[0021]
In the above-described embodiments, the present invention has been described with respect to a bent portion of a high-temperature pipe. However, the present invention is not limited to such a bent portion, and may be applied to a branching / merging portion of a high-temperature pipe such as a T piece portion or a Y piece portion. Can be applied similarly. Therefore, the present invention is not limited to the above-described embodiments, and can of course be changed freely without departing from the gist of the present invention.
[0022]
【The invention's effect】
As described above, the lining structure for a high-temperature pipe according to the present invention can freely deform the liner in the axial direction and the radial direction without being affected by the bent portion, and the gap that can be formed around the liner is small. It is substantially uniform in the circumferential direction, has excellent effects such as being able to keep the heat insulation performance of the internal heat insulating material almost uniformly in each part, and hardly causing gap expansion or breakage between the heat insulating materials.
[Brief description of the drawings]
FIG. 1 is a view showing a lining structure of a high-temperature pipe according to the present invention.
FIG. 2 is an enlarged view of a portion D in FIG.
FIG. 3 is an overall configuration diagram of a conventional pressurized fluidized bed boiler.
FIG. 4 is a view showing a conventional lining structure for high-temperature piping.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Boiler main body 2 Cyclone 3 Ash cooler 4 Bed material storage container 5 Pressure vessel 6a Evaporator 6b Superheater 6c Reheater 7 Exhaust gas pipe 8a Pressure-resistant outer tube 8b Internal heat insulating material 8c Integrated liner 9 Hot gas 12 Pressure-resistant outer tubes 12a-d Outer tube piece 14 Internal heat insulating material 16 Liners 16a to d Liner pieces 17a and 17b End portions (end faces)
18 Support metal fitting 19 Support ring 20 Support plate A Air B Fluidized bed C Coal

Claims (3)

A pressure-resistant outer tube that receives internal pressure, an internal heat-retaining material that is attached to the inner surface of the pressure-resistant outer tube, keeps the high-temperature gas flowing inside and lowers the temperature of the pressure-resistant outer tube, and is placed inside the internal heat-retaining material. It consists of a liner that prevents the insulation material from scattering and wear, and a support fitting that fixes the liner to the pressure-resistant outer tube.
The bent portion of the pressure-resistant outer tube is composed of a plurality of cylindrical outer tube pieces whose end surfaces are inclined with respect to the center line and connected to each other, thereby forming a bent portion of the pressure-resistant outer tube,
The liner is composed of a plurality of cylindrical liner pieces arranged concentrically with each outer tube piece and having both end faces parallel to both end faces of each outer tube piece,
The support bracket is joined to one end of an adjacent liner piece, and a plurality of support rings that concentrically surround the other end so as to be movable in the axial direction, and an inner end is fixed to the support ring, and the outer end in the radial direction. A lining structure for high-temperature piping, characterized by comprising a plurality of support plates extending obliquely in the direction and having outer ends fixed to the inner surface of the pressure-resistant outer tube. The lining structure for high-temperature piping according to claim 1, wherein the support ring includes a pair of rings concentrically surrounding the ends of adjacent liner pieces, and the rings are joined to each other. The lining structure for high-temperature piping according to claim 1, wherein the internal heat insulating material is a fiber having compressibility.

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