JPH1182927A - Aseismatic structure of in-bed tube in hexagonal pressurizing fluidized bed boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cope with the thermal expansion of each in-bed tube by connecting a plurality of horizontal tubes with intervals in the vertical direction at each end part alternately by first, second, third and fourth connection members in a plurality of in-bed tubes. SOLUTION: In a plurality of in-bed tubes 20, a plurality of horizontal tubes constituting in-bed tube groups 16a, 16b with intervals in the vertical direction are connected alternately at each end part. Upper end parts of the in-bed tube groups 16a, 16b are connected to a furnace wall 12b by a first connection member 25, and upper end parts of the in-bed groups 16a, 16b are connected to each other by a second connection member 27. The horizontal tubes at the upper end parts of the in-bed tube groups 16a, 16b are connected to each other by a third connection member 32, and the horizontal tubes at the upper end parts of the in-bed tube groups 16a, 16b are connected to a furnace wall 12a through a fourth connection member 34. The in-bed tube groups 16a, 16b are freely and thermally expanded, and generation of unreasonable thermal stress can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake-resistant structure of a tube in a hexagonal pressurized fluidized-bed boiler.

[0002]

2. Description of the Related Art A pressurized fluidized bed boiler (Pressurized Fluidized Bed Combuster) that fluidly burns coal under pressure is
Combined cycle combined with gas turbine has thermal efficiency of 40% or more, high desulfurization rate in furnace, NO
Due to its features such as low x generation, it is currently being developed as a new type of boiler that replaces the conventional fine-powder boiler.

Such a pressurized fluidized-bed boiler has a configuration in which a boiler body 1, a cyclone 2, a bed material storage container 3, and the like are stored in a pressure container 4, as shown in FIG. The supplied coal C is burned in the boiler main body 1, and the exhaust gas is sent to a cyclone 2, and the exhaust gas from which ash has been removed by the cyclone 2 is supplied to an external gas turbine (not shown) for work (for example, a generator) Drive).

[0004] A fluidized bed B in which bed material such as coal ash and sand flows by air A supplied from below is formed in the boiler main body 1. An evaporator 5, a superheater 6, and a reheater 7 for generation are inserted. Due to the heat generated by the combustion of the coal in the fluidized bed B, the water evaporates in the evaporator 5 to become steam, and the steam is further heated in the superheater 6 to become superheated steam. This superheated steam is provided outside. The steam turbine (not shown) expands and works. Further, the steam whose temperature has been lowered by the steam turbine is heated again by the reheater 7 to become superheated steam, and works again by the external steam turbine.

Further, in recent years, there has been a demand for increasing the capacity of such a pressurized fluidized-bed boiler, and a hexagonal pressurized fluidized-bed boiler in which the horizontal cross section of a boiler main body is formed in a hexagon has been proposed (for example, Japanese Patent Laid-Open Publication No. H11-163873). JP-A-6-337102, JP-A-6-19
3803, JP-A-7-35305, JP-A-7-13
No. 9722, JP-A-7-293801, JP-A-8-3
No. 27016, JP-A-9-14605, etc.).

FIG. 1 is an overall configuration diagram of such a hexagonal pressurized fluidized bed boiler. In this figure, the pressurized fluidized-bed boiler has a configuration in which a boiler body 1, a cyclone 2, a bed material storage container 3, and the like are stored in a pressure container 4, as in FIG. The coal is burned in the boiler main body 1, and the exhaust gas is sent to the cyclone 2 via the exhaust gas manifold 8, and the exhaust gas from which the ash is removed by the cyclone 2 is supplied to an external gas turbine (not shown) to perform work. It is supposed to.

FIG. 2 is a horizontal sectional view taken along line AA of FIG. In this figure, a boiler body 1 has a hexagonal horizontal section and six vertical furnace walls 12a, 12b.
And a hexagonal closed back stay 14. The inside of the hexagon is 3 ° away from the center by 120 °.
The book is divided into three spaces by a virtual dashed line. That is, the inside of the hexagon is formed by two adjacent furnace walls 12a and 12a.
The horizontal section where b is two sides of the parallelogram is 3 of the parallelogram.
Consists of space. Each space has one furnace wall 12a.
A first group of inner tube groups 16a, one end of which is adjacent to the other furnace wall 12b and whose vertical planes are parallel to each other, and the first group of inner tube groups which are parallel to one furnace wall 12a. A second in-layer tube group 16b whose one end is adjacent to the other end of 16a and whose vertical planes are parallel to each other is arranged.

FIG. 3 is a sectional view of the in-layer tube group 16a, 1 in FIG.
It is a side view of the inner tube 20 which comprises 6b. Inner layer pipe 20
Is a support tube 1 suspended from above in the boiler body 1
8, an evaporating tube 21 for evaporating water,
It comprises a superheater tube 22 for heating steam to a high temperature and a reheat tube 23 for reheating steam at a low temperature. Evaporation tube 21, superheated tube 2
2, and the inner tube 20 of the reheat tube 23 has a configuration in which a plurality of horizontal tubes vertically spaced apart from each other are connected alternately at both ends as shown in the figure, and is substantially the same as the support tube 18 as a whole. It is configured in a vertical plane.

The support tube 18 has a rectangular loop portion 18a having a mountain-shaped upper portion, and a hanging portion 18b extending upward from the vertex of the mountain-shaped portion.
And a horizontal U-shaped portion 18c extending below the boiler main body from the lower end of the rectangular loop portion 18a. The support tube 18 is formed of a hollow tube similar to the inner layer tube, and the steam flows through the inside from the horizontal U-shaped portion 18c to the suspension portion 18b, and forms a part of the superheated tube. ing. Hanging part 18
The upper end of b is pivotally attached to a fixed portion (not shown) in the boiler main body, whereby the support tube 18 is suspended from above in the boiler main body. The horizontal U-shaped portion 18c has a relatively long horizontal portion, and is configured to be easily bent in the vertical direction. This allows the support tube 18 to freely expand thermally while suspended from above.

The reheat pipe 23 has a large part provided inside the rectangular loop portion 18a in the vertical plane of the support pipe 18, and allows the steam to flow from the lower end 23a to the upper end 23b so that the low-temperature steam can be reheated. Has become. This reheat tube 23
Is attached to the support pipe 18 by a suitable pipe clamp not shown. Evaporator tube 21 and superheater tube 22
Are provided on both sides of the support tube 18 (both sides perpendicular to the paper surface in FIG. 3) (only one is shown in the drawing), and flow water and steam from the lower ends 21a and 22a to the upper ends 21b and 22b, respectively. It can be evaporated and heated. In addition, the evaporating pipe 21 and the superheating pipe 22
As in the case of 3, it is attached to the support tube 18 by a suitable clamp.

With this configuration, all of the inner layer pipes 20 (the evaporating pipe 21, the superheating pipe 22, and the reheating pipe 23) are attached to the support pipe 18, and are suspended from above through the suspension section 18b of the support pipe. Have been. Accordingly, if, for example, only the evaporating tube 21 of the in-layer tubes is supported by appropriate means in the boiler main body 1, all of the in-layer tubes 20 (evaporating tube 21, superheating tube 2
2. The reheat tube 23) can be supported.

[0012]

In the above-described hexagonal pressurized fluidized-bed boiler, the inside of the fluidized bed is heated to a high temperature of, for example, 800 ° C. or more due to the combustion of coal, and the boiler body and
Heat transfer tubes (hereinafter, referred to as “in-layer tubes”) arranged in a fluidized bed such as an evaporator, a superheater, and a reheater thermally expand. Therefore, in order to prevent the generation of thermal stress, the inner tube cannot be directly fixed to the boiler main body. Conventionally, a support tube (not shown) is hung from above the boiler main body, and each layer is hung on the support tube. An inner tube was attached. However, in such a structure for supporting a tube in a bed, for example, when a horizontal force acts on the tube in a bed in the case of an earthquake or the like, the tube in the bed moves largely horizontally in the fluidized bed and collides with the wall of the boiler body, and There was a risk of damaging the main body and the inner tube.

In particular, in the above-mentioned large-sized hexagonal pressurized fluidized-bed boiler, it is necessary to dispose a large number of inner tubes in a fluidized bed densely. There was a possibility that the stratum tubes might collide with each other and damage the stratum tubes due to the force. Further, in the hexagonal pressurized fluidized-bed boiler, as shown in FIG.
Are rotated by 120 ° with respect to each other, so that there is a problem that it is difficult to support the axial direction of each inner tube group and the horizontal force perpendicular thereto.

The present invention has been made to solve the above problems. That is, the object of the present invention is:
It can cope with the thermal expansion of the inner layer pipes, and even if horizontal force acts on the inner layer pipes in the case of an earthquake or the like, there is no risk of collision between the inner layer pipes and between the inner layer pipes and the boiler body. An object of the present invention is to provide a seismic structure for a tube in a bed in a hexagonal pressurized fluidized bed boiler.

[0015]

According to the present invention, a boiler body 1 having a fluidized bed therein and housed in a pressure vessel,
A plurality of support pipes 18 suspended from above in the boiler main body, and a plurality of inner pipes 20 attached to the support pipes
The boiler main body 1 has a hexagonal horizontal section, and includes six vertical furnace walls 12a and 12b and a hexagonal closed back stay 14, and the inside of the hexagonal shape. Is composed of three parallelograms having a horizontal cross section in which two adjacent furnace walls 12a and 12b are defined as two sides of a parallelogram, and each space has a parallel space with one furnace wall 12a and the other furnace. A first in-layer pipe group 16a whose one end is adjacent to the wall 12b and whose vertical planes are parallel to each other, and one end thereof is adjacent to the other end of the first in-layer pipe group 16a which is parallel to one furnace wall 12a. In the hexagonal pressurized fluidized-bed boiler in which the second group of inner tube groups 16b whose vertical surfaces are parallel to each other are arranged, the inner tube 20 has a plurality of horizontal tubes vertically spaced at both ends. Are connected alternately with each other.
The upper end of the inner layer tube 20 constituting the inner wall 20a and the upper wall adjacent to the furnace wall 12b and the furnace wall 12b are connected to each other via a horizontal first connecting member 25 having horizontal pins at both ends. The upper end portions of the inner tube group 16a and the inner layer tube group 16b are connected via horizontal second connecting members having horizontal pins at both ends, and the inner tube group 20 constituting the inner layer tube groups 16a and 16b, respectively. The horizontal pipe at the upper end is connected to the horizontal part of another horizontal pipe 20 in the horizontal direction by a third connecting member 32, and the horizontal pipe group 1
6a and 16b, respectively, and the horizontal pipe at the upper end of the inner layer pipe 20 adjacent to the furnace wall 12a and the furnace wall 12a are connected via a horizontal fourth connecting member 34 having horizontal pins at both ends. A hexagonal pressurized fluidized-bed boiler is provided with a seismic structure for a bed in a bed.

According to the structure of the present invention, the in-layer tube group 16 is formed.
With respect to the axial direction of the horizontal pipes constituting the pipes a and 16b, the upper end of the inner tube group and the furnace wall 12b are connected by the first connecting member 25, and the upper end of the inner tube group is connected to the second connecting member. 27, the second horizontal connecting member 27 and the first horizontal connecting member 25 apply an axial horizontal force acting on the in-story tube group due to an earthquake or the like.
Through the furnace wall 12b of the boiler body 1.

In the horizontal direction perpendicular to the axis of the horizontal pipe, the horizontal pipes at the upper end of the in-layer pipe group are connected to each other by the third connecting member 3.
2 and the horizontal tube at the upper end of the in-layer tube group and the furnace wall 12a.
Are connected via the fourth connecting member 34, so that a horizontal force acting on the in-layer tube group due to an earthquake or the like is applied to the boiler main body 1 via the third connecting member 32 and the fourth connecting member 34. Furnace wall 1
2a.

Further, the first connecting member 25 and the second connecting member 2
The seventh and fourth connection members 34 are horizontal members having horizontal pins at both ends, and the inner tube is connected to the boiler main body via the support tube. Even if the inner tube is suspended through the support tube and moves only slightly horizontally in the axial direction of the inner tube, the inner tube can be freely thermally expanded and cannot be applied to the inner tube. No thermal stress is generated. In addition, even if horizontal force acts in the axial direction and vertical direction of the stratum tube in the case of an earthquake or the like, since this horizontal force is transmitted to the furnace wall of the boiler body through the horizontal connecting member, Hardly moves in the boiler main body, and there is no possibility that the inner tube and the boiler main body collide.

According to a preferred embodiment of the present invention, the third
The connecting member 32 is composed of two rectangular tubes 33a each surrounding a horizontal portion of the adjacent inner layer tube 20, and two connecting plates 33b each having one end fixed to the rectangular tube and extending in the horizontal direction. Are connected by two spaced horizontal pins 31a and 31b, at least one of which is a bendable thin wire.

With this configuration, the individual third connecting members can be arranged while being shifted in the axial direction of the horizontal pipe, and can be arranged in parallel with the furnace walls 12a and 12b of the hexagonal pressurized fluidized bed boiler. Even if the space in the width direction is small, the seismic load can be transmitted, and the welding of the fitting to the pipe can be reduced, thereby reducing the time and labor required for thermal spraying, inspection and maintenance of the hydraulic test.

[0021] Further, with this configuration, it is possible to separate adjacent layered pipes simply by pulling out a bendable thin wire and removing another pin, thereby facilitating maintenance.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to the common parts in the respective drawings, and the duplicate description will be omitted.

FIG. 4 is a cross-sectional view taken along line BB of one of the three parallelogram spaces shown in FIG. In this figure, two in-layer pipes 20 are arranged at substantially the same height in substantially the same vertical plane and at intervals.

FIG. 5 is an enlarged view of a portion C and a portion D in FIG. As shown in FIG.
The upper end of the inner tube 20 of the boiler main body 1 constituting the inner layer 6a, 16b adjacent to the furnace wall 12b of the boiler body 1 and the furnace wall 12b are connected via a horizontal first connecting member 25 having horizontal pins 24 at both ends. Connected. With this configuration, even if the inner tube 20 is thermally expanded and slightly moved up and down, the inner tube 20 is supported by the support tube 18.
Only by slightly moving horizontally in the axial direction of the in-layer tube 20 while being suspended through the tube, the in-layer tube 20 can freely expand thermally, and excessive thermal stress is generated in the in-layer tube 20. There is no. Further, even when a horizontal force acts in the axial direction of the inner layer pipe 20 in the case of an earthquake or the like, the horizontal force is applied to the horizontal first connecting member 25.
Through the furnace wall 12b of the boiler body 1
The stratum tube 20 hardly moves in the boiler main body 1, and there is no possibility that the stratum tube 20 and the boiler main body 1 collide.

In section D, the upper end portions of the in-layer tube group 16a and the in-layer tube group 16b are connected via a horizontal second connecting member 27 having horizontal pins 26 at both ends. With this configuration, the horizontal force in the axial direction of the in-layer pipes acting on the two in-layer pipe groups 16a and 16b is transmitted without difficulty to the boiler main body via the horizontal second connection member 27 and the first connection member 25. be able to. The end of the horizontal tube 20 adjacent to the boiler main body 1 is connected to the furnace wall 12b of the boiler main body 1 as shown in part C of FIG.
The end opposite the 0 end is only adjacent to the in-layer tube group of another chamber in FIG. 2 and is not connected to the boiler body or the like. Thus, the two inner tubes 20 are
It can freely expand in the axial direction of the inner layer tube.

FIG. 6 is an enlarged view (A) of a portion E in FIG. 2 and a cross-sectional view thereof (B). In this figure, the in-layer tube group 16
The horizontal pipe at the upper end of the inner pipe 20 constituting each of the inner pipes a and 16b is connected to the horizontal portion of another adjacent inner pipe 20 in the horizontal direction by the third connecting member 32. The third connecting member 32 includes two rectangular pipes 33a respectively surrounding the horizontal portions of the adjacent inner layer pipes 20, and two connecting plates 33b each having one end fixed to the rectangular pipe 33a and extending in the horizontal direction. . The two connecting plates 33b are connected by two horizontal pins 31a and 31b spaced apart from each other, and at least one of the connecting plates 33b is formed of a bendable thin wire.

With this configuration, each third connecting member 32
Can be arranged while shifting in the axial direction of the horizontal pipe,
The third connecting member 32 can be disposed parallel to the furnace wall 12b of the hexagonal pressurized fluidized bed boiler. Therefore, even if the space in the width direction is small, the seismic load can be transmitted, the welding of the fitting (rectangular pipe 33a) to the pipe can be reduced, and the trouble of thermal spraying, the inspection of the hydraulic pressure test, and the maintenance can be reduced. Further, with this configuration, it is possible to separate the adjacent inner layer pipes 20 simply by pulling out the bendable thin wire 31b and removing the other pin 31a, thereby facilitating maintenance.

Further, in FIG. 6, the in-layer tube group 16a, 1
6b and the horizontal pipe at the upper end of the in-layer pipe 20 adjacent to the boiler main body 1 and the boiler main body 1 are connected via a horizontal fourth connecting member 34 having horizontal pins 34a at both ends. I have. Further, the portion of the furnace wall 12a to which the fourth connecting member 34 is connected is connected to the backstay 14 via another horizontal connecting member (not shown) having horizontal pins at both ends. With this configuration, a horizontal force in a direction perpendicular to the axis of the inner tube can be transmitted from the two inner tubes 20 adjacent to the boiler main body to the backstay 14 via the furnace wall 12a.

According to the above-described structure, even if a horizontal force acts in a direction perpendicular to the axis of the inner pipe 20 in the event of an earthquake or the like, the horizontal force is applied to the boiler via the third connecting member 32 and the fourth connecting member 34. Since it is transmitted to the backstay 14 of the main body, the inner layer pipe 20 hardly moves in the boiler main body, and there is no possibility that the inner layer pipes collide with each other or between the inner layer pipe and the boiler main body. In addition, even if the inner layer tube 20 slightly expands and contracts due to thermal expansion, the inner layer tube 20 moves slightly horizontally in the direction perpendicular to the axis of the inner layer tube 20 while being suspended via the support tube. Alone, the inner tube 20 can be freely thermally expanded, and the inner tube 20
Unnecessary thermal stress does not occur.

FIG. 7 is an enlarged perspective view of a portion F in FIG. In this figure, a boiler body 1 is a vertical water pipe 1
Furnace walls 12a and 12b, each of which includes a fin 1b and a fin 11b connecting the water pipe 11a, and a backstay 14 surrounding the furnace wall with a space therebetween. Further, the furnace walls 12a, 12b and the back stay 14 are connected via a pair of vertically inclined connecting members 36 having horizontal pins 35 at both ends. A triangular truss is formed by the upper and lower pairs of the inclined connecting members 36, and the furnace walls 12a and 12b and the back stay 14 are integrated.

Further, the back stay 14 has at least three projections 14a extending radially outward in the horizontal direction.
The protrusion 14a is provided on the inner surface of the pressure vessel 4 with the sliding fitting 4a.
Are slidably guided in the radial and vertical directions. With such a configuration, the up-down movement and the radial movement of the back stay 14 are allowed, and the horizontal movement and the rotation of the back stay 14 can be prevented at the same time.

As described above, according to the configuration of the present invention, in the axial direction of the horizontal tubes constituting the in-layer tube groups 16a and 16b, the upper end of the in-layer tube group and the furnace wall 12b are connected to the first connecting member. 25, the upper end portions of the in-layer tube groups are connected to each other by the second connecting member 27, so that the axial horizontal force acting on the in-layer tube group due to an earthquake or the like is transmitted to the second connecting member 27. The power can be transmitted to the furnace wall 12 b of the boiler main body 1 via the first connection member 25.

In the horizontal direction perpendicular to the axis of the horizontal pipe, the horizontal pipes at the upper end of the in-layer pipe group are connected to each other by the third connecting member 3.
2 and the horizontal tube at the upper end of the in-layer tube group and the furnace wall 12a.
Are connected via the fourth connecting member 34, so that a horizontal force acting on the in-layer tube group due to an earthquake or the like is applied to the boiler main body 1 via the third connecting member 32 and the fourth connecting member 34. Can be transmitted.

Further, the first connecting member 25 and the second connecting member 2
The seventh and fourth connection members 34 are horizontal members having horizontal pins at both ends, and the inner layer tube 20 is connected to the boiler body via the support tube. Even if it moves up and down, the tube in the stratum only slightly moves horizontally in the axial direction of the tube in the stratum while being suspended via the support tube 18,
The inner layer tube can be freely thermally expanded, and no excessive thermal stress is generated in the inner layer tube. Also, even in the event of an earthquake or the like, even if a horizontal force acts in the axial direction and the vertical direction of the inner layer pipe, this horizontal force is transmitted to the boiler body via a horizontal connecting member,
The inner layer tube hardly moves in the boiler main body, and there is no possibility that the inner layer tube and the boiler main body collide.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

[0036]

As described above, according to the structure of the present invention, the inner tube can be thermally expanded freely, and unreasonable thermal stress does not occur in the inner tube. Also, even in the event of an earthquake or the like, even if a horizontal force acts in the axial direction of the layered pipe or in a direction perpendicular to the axis, this horizontal force is transmitted to the boiler main body via a horizontal connecting member, so that the layered pipe is Hardly move in the boiler body,
There is no possibility that the inner tube and the boiler main body collide.

Therefore, the seismic structure of the inner tube in the hexagonal pressurized fluidized bed boiler of the present invention can cope with the thermal expansion of the inner tube, and a horizontal force is applied to the inner tube in the event of an earthquake or the like. Even if it acts, it has an excellent effect that there is no possibility that the inner pipes and the inner pipe and the boiler main body collide with each other.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a pressurized fluidized-bed boiler to which the present invention is applied.

FIG. 2 is a horizontal sectional view taken along line AA of FIG.

FIG. 3 is a side view of the inner tube 20 constituting the inner tube group in FIG. 2;

FIG. 4 is a cross-sectional view taken along line BB of one of three parallelogram-shaped spaces in FIG. 2;

FIG. 5 is an enlarged view of a portion C and a portion D in FIG.

FIG. 6 is an enlarged sectional view of a portion E in FIG. 2;

FIG. 7 is an enlarged perspective view of a portion F in FIG. 2;

FIG. 8 is an overall configuration diagram of a conventional pressurized fluidized bed boiler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Boiler main body 2 Cyclone 3 Bed material storage container 4 Pressure container 5 Evaporator 6 Superheater 7 Reheater 8 Exhaust gas manifold 11a Water pipe 11b Fin 12a, 12b Furnace wall 14 Backstay 14a Projection 16a First inner layer tube group 16b Second layer pipe group 18 Support pipe 20 Layer pipe 21 Evaporation pipe 22 Superheat pipe 23 Reheat pipe 24, 26, 31a, 35 Horizontal pin 25, 27, 32, 34, 36 Connection member 31b Wire 33a Rectangular pipe 33b Connection Plate A Air B Fluidized bed C Coal

Claims (2)

[Claims] 1. A boiler body 1 having a fluidized bed therein and stored in a pressure vessel, a plurality of support tubes 18 suspended from above in the boiler body, and a plurality of support tubes attached to the support tubes. The boiler main body 1 is provided with:
Six vertical furnace walls 12 having a hexagonal internal horizontal section
a, 12b, and a hexagonal closed back stay 14, and the inside of the hexagon includes two adjacent furnace walls 12a, 12b.
The horizontal section where b is two sides of the parallelogram is 3 of the parallelogram.
Space, and each space includes one furnace wall 12a.
A first tube group 16a in parallel with each other and one end of which is adjacent to the other furnace wall 12b and whose vertical faces are parallel to each other;
A hexagonal pressurized fluidized-bed boiler in which a second group of in-layer pipes 16b parallel to 2a and having one end adjacent to the other end of the first group of in-layer pipes 16a and one end of which is parallel to each other is disposed. In the above, the inner tube 20 has a configuration in which a plurality of horizontal tubes spaced apart in the vertical direction are connected alternately at both ends, and the furnace wall of the inner tube 20 constituting the inner tube groups 16a and 16b. 1
The upper end on the side adjacent to 2b and the furnace wall 12b are connected via a horizontal first connecting member 25 having horizontal pins at both ends, and the upper end of the inner tube group 16a and the inner tube group 16b Are connected via a horizontal second connecting member 27 having horizontal pins at both ends, and the in-layer pipes 20 constituting the in-layer pipe groups 16a and 16b, respectively.
The horizontal pipe at the upper end of the pipe is connected to the horizontal portion of another horizontally adjacent pipe 20 by a third connecting member 32 to form the pipe groups 16a and 16b, respectively.
a horizontal pipe at the upper end of the in-layer pipe 20 adjacent to the furnace wall 12a
Is a horizontal fourth connecting member 3 having horizontal pins at both ends.
4. A seismic structure for a tube in a hexagonal pressurized fluidized-bed boiler, wherein the tube is connected through a bed 4. 2. The third connecting member 32 includes two rectangular tubes 33a each surrounding a horizontal portion of an adjacent inner layer tube 20,
One end is fixed to each of the rectangular tubes and extends in the horizontal direction.
And two connecting plates 33b. The two connecting plates are connected by two horizontal pins 31a and 31b spaced from each other.
At least one of which is a bendable thin wire,
The seismic structure of a tube in a bed in a hexagonal pressurized fluidized-bed boiler according to claim 1, characterized in that: