JP6971867B2 - Sealing device and sealing method for exhaust heat recovery boiler and exhaust heat recovery boiler equipped with this - Google Patents

Description

The present invention relates to a sealing device for sealing a gas flow between an internal structure housed in a duct and an inner wall of the duct, an exhaust heat recovery boiler provided with the sealing device, and a sealing method for the exhaust heat recovery boiler.

The exhaust heat recovery boiler (HRSG: Heat Recovery Steam Generator) houses internal structures such as a heat transfer tube group and a denitration device inside the duct. In this state, a short path is generated between the internal structure and the inner wall of the duct as a flow path through which heated gas such as combustion exhaust gas passes. Since the heating gas passing through the flow path does not pass through the internal structure, the predetermined treatment (heat exchange, denitration, etc.) may not be sufficiently performed, and the exhaust heat recovery boiler may not exhibit the predetermined performance. Patent Document 1 discloses a sealing device for preventing a short path through which exhaust gas, which is a heating gas, passes between a duct of an exhaust heat recovery boiler and a heat transfer tube group.

Japanese Unexamined Patent Publication No. 2017-72342

In Patent Document 1, the free end of the second gas seal plate composed of a plurality of laminated thin plates comes into contact with the first gas seal plate to seal the exhaust gas and suppress a short path. ..

When attaching a sealing device to various sizes of exhaust heat recovery boilers including large exhaust heat recovery boilers, the size of the mounting member or thin plate may be selected to a size that is easy to handle. In this case, a plurality of mounting members for fixing and mounting the thin plate are fixed so as to be arranged in a row with respect to the inner wall of the duct, and each mounting member is displaced due to thermal deformation such as thermal elongation of the inner wall of the duct. Due to the displacement of the mounting members, the distance between the adjacent mounting members changes, and the thin plate fixed by the mounting members may be deformed such as wrinkles, resulting in damage (for example, the wrinkles 13B shown in FIG. 6). reference). If the thin plate is deformed and damaged, the sealing performance may deteriorate and the target performance as an exhaust heat recovery boiler may not be exhibited.

In view of these circumstances, the present disclosure discloses a sealing device that does not damage the thin plate even when the thin plate is used as the sealing member, and an exhaust heat recovery boiler and an exhaust heat recovery boiler equipped with the sealing device. It is intended to provide a sealing method for.

The sealing device according to one aspect of the present disclosure is a baffle plate for partitioning between an inner wall of a duct through which heating gas flows and an internal structure housed in the duct, and the heating gas between the inner wall and the baffle plate. A long-shaped first sealing plate that seals the passage and is arranged so that the longitudinal direction is orthogonal to the flow direction of the heating gas and protrudes from the baffle plate toward the inner wall side of the duct. And a long thin plate that is arranged so that the longitudinal direction is along the longitudinal direction of the first seal plate, and the end portion in the lateral direction on the side of the first seal plate is in contact with the first seal plate as a free end. The second seal plate is provided between the second seal plate, a plurality of mounting members for fixing the fixed end on the side opposite to the free end of the second seal plate, and the mounting member. A holding plate that sandwiches and fixes the fixed end is provided, and at least one of the plurality of mounting members is arranged side by side in a row at predetermined intervals and extends between adjacent mounting members. At the same time, a stiffening plate having a thickness thicker than that of the thin plate is arranged between the mounting member and the second seal plate and / or between the presser plate and the second seal plate.

A sealing device is provided between the baffle plate that separates the internal structure housed in the duct and the inner wall of the duct from the inner wall of the duct, and the flow of heated gas between the internal structure and the inner wall of the duct (short path). ) Is prevented. Specifically, the short path is made by contacting the free end of the second seal plate whose fixed end is fixed by the mounting member attached to the inner wall of the duct with the first seal plate protruding from the baffle plate. To prevent.
When the heating gas flows in the duct, the relative position of the mounting member changes due to thermal deformation such as thermal elongation of the inner wall of the duct. When the relative position of the mounting members changes, the spacing between the adjacent mounting members arranged in a row in the longitudinal direction at predetermined intervals also changes. When the distance between the mounting members changes, the second sealing plate narrowed and fixed between the mounting member and the holding plate is composed of a thin plate, so that the thin plate at the fixed end of the second sealing member is deformed. Wrinkles may occur and the product may be damaged.
On the other hand, it was decided to provide a stiffening plate having a thickness thicker than that of the thin plate between the mounting member and the second seal plate and / or between the presser plate and the second seal plate. Even if the spacing between the mounting members changes, the rigidity of the thin plate is reinforced by the stiffening plate, and the stiffening plate slides between the mounting member and the holding plate, so that the deformation of the thin plate can be suppressed. As a result, it is possible to avoid damage to the thin plate of the second seal plate and suppress deterioration of the seal performance.
Examples of the internal structure include heat transfer tubes such as economizers, evaporators, and superheaters, and denitration devices for denitration.
The stiffening plate may be installed between the mounting member and the second seal plate, or between the presser plate and the second seal plate, but it is preferable to install the stiffening plate on both.

Further, in the sealing device according to one aspect, the mounting member is fixed and fixed to the inner wall, and a plurality of liner members are installed so that the periphery of the plurality of plate-shaped members is partially overlapped with each other. At least one of the mounting members is arranged so as to straddle between the adjacent plate-shaped members of the liner member.

When a heat insulating material is provided on the inner wall of the duct to suppress the dissipation of the heat of the heating gas, the liner member provided with the plate-shaped member supporting the heat insulating material is fixed to the inner wall of the duct, and the mounting member is plate-shaped. It may be fixed to a member. The liner member is configured to use a plurality of plate-shaped members to partially overlap each other to suppress a gap so that exhaust gas does not pass through the heat insulating material, and the plate-shaped members are partially overlapped. The mounting members are likely to be displaced due to thermal expansion of the plate-shaped members at the aligned points, and the distance between adjacent mounting members is also likely to change. Therefore, the thin plate fixed by the mounting member is likely to be deformed such as wrinkles, which increases the risk of damage. Deformation of the thin plate can be effectively suppressed even in places where displacement is likely to occur in the mounting member.

Further, the sealing device according to one aspect includes a bolt penetrating between the mounting member, the stiffening plate, the second sealing plate and the holding plate, and is formed on the stiffening plate and the second sealing plate. The bolt hole through which the bolt is formed is an elongated hole in which the displacement direction of the liner member is the longitudinal direction.

The mounting member, the stiffening plate, the second seal plate, and the holding plate are fixed to each other in a state of being sandwiched by bolts penetrating them. The bolt holes formed in the stiffening plate and the second seal plate were elongated holes in which the displacement direction of the liner member was the longitudinal direction.
Even if each mounting member is displaced due to the displacement of the liner, the bolt holes of the stiffening plate and the second seal plate are elongated holes whose displacement direction is the longitudinal direction, so even if the bolts are displaced together with the mounting member. By sliding the stiffening plate and the second sealing plate together with the bolt with respect to the bolt without displacement, the displacement of the stiffening plate and the second sealing plate can be suppressed. As a result, the deformation of the thin plate of the second seal plate can be further suppressed.

Further, in the sealing device according to one aspect, the width of the stiffening plate in the lateral direction is the same as the width of the holding plate in the lateral direction.

By making the width of the stiffening plate in the lateral direction the same as the width of the presser plate in the lateral direction, it is possible to facilitate parts management and reduce costs.

Further, in the sealing device according to one aspect, the width of the stiffening plate in the lateral direction is longer or shorter than the width of the holding plate in the lateral direction.

By making the width of the stiffening plate in the lateral direction longer or shorter than the width of the presser plate in the lateral direction, the bending starting point of the thin plate (second seal member) by the stiffening plate and the free end of the thin plate can be obtained. The bending rigidity of the thin plate can be changed by changing the distance. Thereby, the contact force between the first seal plate and the second seal plate can be adjusted. For example, by making the width of the stiffening plate in the lateral direction longer than the width of the presser plate in the lateral direction, the contact force with the first sealing plate can be weakened, and by shortening it, the first sealing plate can be weakened. The contact force with can be strengthened.

Further, the exhaust heat recovery boiler according to one aspect is provided with the sealing device according to any one of the above.

By providing any of the above sealing devices, it is possible to prevent a short path between the internal structure and the inner wall of the duct, and it is possible to improve the performance as an exhaust heat recovery boiler.

The method for sealing the exhaust heat recovery boiler according to one aspect is the heating between the baffle plate that partitions the inner wall of the duct through which the heating gas flows and the internal structure housed in the duct, and the inner wall. A method for sealing an exhaust heat recovery boiler that seals the passage of gas, wherein the exhaust heat recovery boiler is arranged so that the longitudinal direction is orthogonal to the flow direction of the heated gas, and the baffle plate to the duct. The long first seal plate protruding toward the inner wall side and the longitudinal direction are arranged along the longitudinal direction of the first seal plate, and the lateral end portion on the first seal plate side is a free end. A second seal plate made of a long thin plate in contact with the first seal plate, and a plurality of mounting members for fixing a fixed end on the side opposite to the free end of the second seal plate. The second mounting member is fixed to the inner wall, and the liner member is installed so that the periphery of the plurality of plate-shaped members is partially overlapped with each other. A presser plate for sandwiching and fixing the fixed end of the seal plate is provided, and at least one of the plurality of mounting members is arranged in a row at predetermined intervals across the adjacent plate-shaped members of the liner member. Arranged side by side, extending between the adjacent mounting members, and / or between the mounting member and the second seal plate and / or between the presser plate and the second seal plate. Place a stiffening plate that is thicker than the thin plate.

Even when a thin plate is used as the sealing member, the stiffening plate supplements the rigidity of the thin plate to suppress the deformation of the thin plate and prevent the thin plate from being damaged.

It is a side view which showed the outline of the exhaust heat recovery boiler which concerns on 1st Embodiment. It is a horizontal sectional view showing a part of the exhaust heat recovery boiler of FIG. 1 in an enlarged manner. It is sectional drawing which showed the circumference of a sealing device in an enlarged manner. It is a perspective view which showed the circumference of a sealing device in an enlarged manner. It is a front view which showed the inner seal and the stiffening plate. It is a partially enlarged perspective view which showed the wrinkle which occurs in a thin plate. It is sectional drawing which showed the structure which made the width of a stiffening plate and the width of a holding plate the same dimension. It is sectional drawing which showed the structure which made the width of a stiffener plate longer than the width of a presser plate. It is sectional drawing which showed the structure which made the width of a stiffening plate shorter than the width of a holding plate. It is sectional drawing which showed the structure which provided the guide plate.

1 and 2 show the exhaust heat recovery boiler 1 according to the present embodiment. The exhaust heat recovery boiler 1 is a horizontal exhaust heat recovery boiler in which combustion exhaust gas (heated gas: hereinafter simply referred to as "exhaust gas") derived from a gas turbine or the like is introduced and flows in the horizontal direction in the present embodiment. There is. In the present embodiment, the exhaust gas flow direction is the horizontal direction, the direction orthogonal to the horizontal direction is the vertical direction, and the longitudinal direction of the heat transfer tube 7 is the vertical direction, but the present invention is not limited to this. That is, the exhaust heat recovery boiler may be a vertical type in which the exhaust gas flows in the vertical direction. Also in this case, the sealing device 12 described later can be provided between the heat transfer tube 7 group and the inner wall of the duct 2 to reduce the amount of exhaust gas flowing in the vicinity of the inner wall of the duct 2.

Further, the sealing device 12 described later is provided between the heat transfer tube 7 group and the inner wall of the duct 2. In the horizontal exhaust heat recovery boiler in which the exhaust gas flows in the horizontal direction, the exhaust gas also passes through the space between the headers provided at the upper and lower ends of the heat transfer tube 7 in the vertical direction and the vertical upper surface or the lower surface of the inner wall of the duct 2. A structure to prevent (not shown) is provided.

The exhaust heat recovery boiler 1 is provided with a heat exchange unit 5 such as an economizer, an evaporator, a superheater, and a denitration device (internal structure) 6 inside a duct 2 extending in the horizontal direction. .. The exhaust gas discharged from the gas turbine or the like is introduced into the duct 2 from the duct inlet 3, passes through the plurality of heat exchange portions 5 and the denitration device 6 in sequence, and then is discharged from the chimney (not shown) through the duct outlet 4. Will be done.

The heat exchange unit 5 has a plurality of heat transfer tubes 7 extending in the vertical direction so as to intersect the exhaust gas flow direction. A drum 9 connected to a plurality of heat transfer tubes 7 via a header (not shown) is provided outside the duct 2. In addition, in FIG. 1, a plurality of heat transfer tube 7 groups are aggregated and displayed as a heat exchange unit 5, and also in FIG. 2, the number of heat transfer tubes 7 installed is schematically displayed. In FIG. 2, the inner liner 16, the heat insulating material 17, the stud bolt 18, and the like, which will be described later, on the inner wall side of the duct 2 are omitted.

As shown in FIG. 2, the baffle plate 10 is a long plate-shaped member, and is arranged at an end portion of the heat exchange portion 5 outside the plurality of heat transfer tubes 7, that is, on the inner wall side of the duct 2. .. The baffle plate 10 partitions the area where the heat transfer tube 7 is arranged and the area on the inner wall side of the duct 2. The baffle plate 10 is arranged substantially parallel to the inner wall of the duct 2 and separated from the inner wall of the duct 2. In the present embodiment, the baffle plate 10 is located at a position of, for example, about 100 mm to 300 mm from the inner wall of the duct 2. The baffle plate 10 is suspended and supported from vertically above the duct 2. The baffle plate 10 is made of a material having rigidity even in high temperature exhaust gas such as a steel plate.

A space 20 is formed between the inner wall surface of the duct 2 and the outer surface of the baffle plate 10. In this space 20, a sealing device 12 provided with a first gas sealing plate (first sealing plate) 11 is installed. The sealing device 12 suppresses the passage of exhaust gas (short path) through the space 20 between the inner wall of the duct 2 and the outer surface of the baffle plate 10 (the surface on the inner wall side of the duct 2).

The first gas seal plate 11 is a long plate-shaped member, and is provided in the longitudinal direction in a substantially vertical direction (direction orthogonal to the exhaust gas flow direction) with respect to the plate surface of the baffle plate 10. That is, the lateral direction of the first gas seal plate 11 is arranged substantially perpendicular to the exhaust gas flow direction in the space 20 between the inner wall of the duct 2 and the outer surface of the baffle plate 10.

As shown in FIG. 3, the first gas seal plate 11 has an end portion 11a on one side in the width direction fixed to the baffle plate 10 and is arranged so as to project from the baffle plate 10 toward the inner wall surface of the duct 2. .. The other end 11b of the first gas seal plate 11 is separated from the duct 2. In the present embodiment, the end portion 11b of the first gas seal plate 11 is located, for example, at a position of about 30 mm to 100 mm from the inner wall surface of the duct 2, and the temperature rise due to the exhaust gas is caused by the thermal expansion difference between the duct 2 and the heat exchange portion 5. It prevents contact due to deformation and mutual positional displacement. The first gas seal plate 11 is made of a material having rigidity even in high temperature exhaust gas such as a steel plate.

The sealing device 12 includes a second gas sealing plate (second sealing plate) 13 and a mounting plate (mounting member) 14. The second gas seal plate 13 and the mounting plate 14 are arranged so as to close the gap of the exhaust gas passage which is a short path between the inner wall of the duct 2 and the first gas seal plate 11.

The second gas seal plate 13 is arranged so that the longitudinal direction is orthogonal to the flow direction of the exhaust gas flowing inside the duct 2 (in the vertical direction in this embodiment). The second gas seal plate 13 is composed of a plurality of laminated thin plates 13A (three in FIG. 3). Each thin plate 13A has a thickness of 0.1 mm to 0.7 mm (preferably 0.2 mm to 0.3 mm), and is a long plate-shaped member having a vertical direction as a longitudinal direction. The thin plate 13A is a material having elasticity at the temperature of the exhaust gas flowing through the duct 2, and is preferably a thickness and a material having a restoring force after a load such as bending of several tens of mm is applied at the free end 13b. Further, the thin plate 13A is preferably a material that is not easily corroded in an exhaust gas atmosphere, and is, for example, stainless steel (SUS304, SUS310, SUS316, etc.). As shown in FIG. 4, a plurality of thin plates 13A are arranged in the longitudinal direction so that warp deformation can be reduced and the number of parts can be reduced even when a temperature distribution occurs in the longitudinal direction of the thin plates 13A. It is composed of a predetermined length. At the end of each of the arranged thin plates 13A, the thin plates 13A of one layer are arranged in an overlapped state so as to be present at the position where the thin plates 13A of the other layer are adjacent to each other, and the exhaust gas passes through the positions where the thin plates 13A are adjacent to each other. The gap may not be generated.

As shown in FIG. 3, one end of the thin plate 13A in the lateral direction, that is, in the width direction is a fixed end 13a, which is fixed to the mounting plate 14. The other end of the thin plate 13A in the width direction is a free end 13b, which is elastically in contact with the upstream surface of the exhaust gas flow of the first gas seal plate 11. As a result, the exhaust gas is sealed between the first gas seal plate 11 and the second gas seal plate 13 so as not to pass therethrough.

A heat insulating material 17 is provided between the wall portion 2a of the duct 2 and the inner liner 16 so that the heat energy of the exhaust gas does not dissipate to the outside. The heat insulating material 17 is held by being covered with the inner liner 16. The mounting plate 14 is fixed to the inner liner (liner member) 16 provided on the inner wall of the duct 2. The inner liner 16 is made of metal, and is composed of a plurality of plate-shaped members 16a having a size of about 1 m square in order to handle the inner liner 16 and reduce warpage deformation due to temperature distribution in the inner liner 16 surface. In order to prevent the exhaust gas from flowing out to the heat insulating material 17, the periphery (each side) of each plate-shaped member 16a is installed in a state of being partially overlapped with each other. Since the exhaust gas flowing around the inner liner 16 is, for example, a high-temperature gas of 700 ° C. to 350 ° C., the inner liner 16 is configured by the plurality of plate-shaped members 16a in this way, and each plate-shaped member 16a can be displaced. By attaching to and supporting the duct 2 (see the arrow in FIG. 4), the duct 2 is allowed to be thermally deformed. The inner liner 16 is fixed to the wall portion 2a of the duct 2 by a plurality of stud bolts 18.

The mounting plate 14 is made of metal having a thickness of 3 mm to 5 mm, and its cross section is formed into a substantially Z shape by pressing a long plate material. One end 14a of the mounting plate 14 is fixed to the inner liner 16 by spot welding, for example. An embedded bolt (bolt) 19 is fixed to the other end 14b of the mounting plate 14. The other end 14b of the mounting plate 14 can be fixed by the holding plate 22 by the nut 21 screwed into the embedded bolt 19. The presser plate 22 is made of metal having a thickness of 3 mm to 5 mm, and has a long plate shape extending in the longitudinal direction (vertical direction in this embodiment) of the mounting plate 14.

The fixed end 13a of the second gas seal plate 13 described above, and the first stiffening plate 24a and the second stiffening plate 24b are sandwiched and fixed between the mounting plate 14 and the holding plate 22. There is.
The first stiffening plate 24a is provided between the mounting plate 14 and the second gas seal plate 13, and the second stiffening plate 24b is provided between the holding plate 22 and the second gas seal plate 13. There is. Each of the stiffening plates 24a and 24b has a long plate shape extending in the longitudinal direction (vertical direction in this embodiment) of the mounting plate 14, and the plate thickness is the thin plate 13A of the second gas seal plate 13. The plate thickness is thicker than that, for example, it is made of metal having a thickness of 0.4 mm to 2.0 mm (for example, 2 to 10 times the plate thickness of the thin plate 13A). The stiffening plates 24a and 24b are preferably made of a material that is not easily corroded in an exhaust gas atmosphere, and are, for example, stainless steel (SUS304, SUS310, SUS316, etc.). A plurality of stiffening plates 24a and 24b are provided at intervals δ in the longitudinal direction (vertical direction in this embodiment) of the mounting plate 14 (see FIG. 5). This interval δ is set so that the stiffening plates 24a and 24b adjacent to each other in the longitudinal direction do not come into contact with each other and interfere with each other according to the displacement amount of the inner liner 16.

As shown in FIG. 5, the stiffening plates 24a and 24b are provided with a plurality of elongated holes 25 at positions that penetrate the shaft portion of the embedded bolt 19 (see FIG. 3). Each elongated hole 25 has a shape in which the vertical direction is the longitudinal direction in the present embodiment so as to coincide with the displacement direction (see the arrow in FIG. 5) of each plate-shaped member 16a of the inner liner 16. A plurality of elongated holes are formed in each thin plate 13A so as to correspond to the elongated holes 25 of the stiffening plates 24a and 24b. As a result, the stiffening plates 24a and 24b and the thin plates 13A can slide without being displaced from each other according to the displacement of the inner liner 16.

On the other hand, the presser plate 22 is formed with a round hole (not shown) instead of a long hole. As a result, the holding plate 22 is displaced in the same manner as the mounting plate 14 connected by the embedded bolt 19.

As shown in FIG. 4, the stiffening plates 24a and 24b are arranged so as to extend between the mounting plates 14 in which a plurality of stiffening plates 24a and 24b are arranged in a row in the longitudinal direction in the vertical direction in the present embodiment. .. That is, the stiffening plates 24a and 24b are arranged so as to cover the thin plates 13A in the gap d between the mounting plates 14 adjacent to each other in the longitudinal direction.

The effects of the configuration of the present embodiment described above are as follows.
When the exhaust gas flows through the heat exchange section 5, a seal is performed between the baffle plate 10 and the inner wall of the duct 2 by a sealing device provided with a first gas seal plate 11 and a second gas seal plate 13.
Structures such as the duct 2 and the inner liner 16 are displaced due to thermal elongation or the like according to the temperature of the exhaust gas (for example, 700 ° C to 350 ° C). Specifically, as shown in FIG. 4, the relative positions of the plate-shaped members 16a of the inner liner 16 are displaced in the vertical direction as shown by the arrows due to the thermal deformation of the duct 2 and the thermal deformation of the inner liner 16. The mounting plate 14 is composed of a plurality of mounting plates 14 having a predetermined length so as to reduce warpage deformation even when a temperature distribution occurs in the longitudinal direction, in order to reduce the number of types of parts and handleability, and to form a row in the longitudinal direction. It is fixed to each plate-shaped member 16a side by side. When the relative position of each plate-shaped member 16a changes, the distance between the mounting plates 14 divided between the plate-shaped members and arranged with a gap d also changes. When the gap d between the mounting plates 14 changes, the second gas sealing plate 13 narrowed and fixed between the mounting plate 14 and the holding plate 22 is composed of the thin plate 13A, so that the second gas sealing plate is formed. The thin plate 13A at the fixed end 13a of 13 may be deformed to cause wrinkles 13B and the like as shown in FIG. 6, and may be damaged.
On the other hand, in the present embodiment, the thickness between the mounting plate 14 and the second gas seal plate 13 and / or between the presser plate 22 and the second gas seal plate 13 is thicker than that of the thin plate. It was decided to provide the stiffening plates 24a and 24b. Even if the gap d of the mounting plate 14 changes, the rigidity of the thin plate 13A is reinforced by the stiffening plates 24a and 24b, and between the stiffening plate 24a and the mounting plate 14 and between the stiffening plate 24b and the holding plate 22. Deformation of the thin plate 13A can be suppressed by allowing the thin plate 13A to slide and move between the two. As a result, it is possible to avoid damage to the thin plate 13A of the second gas seal plate 13 and suppress deterioration of the sealing performance.

Even if each mounting plate 14 is displaced due to the displacement of the inner liner 16, the bolt holes of the stiffening plates 24a and 24b and the second gas seal plate 13 are elongated holes 25 whose displacement direction is the longitudinal direction (see FIG. 5). It is said that. Therefore, even if the embedding bolt 19 is displaced together with the mounting plate 14, the stiffening plates 24a and 24b and the second gas seal plate 13 are not displaced together with the embedding bolt 19, and can be slid with respect to the embedding bolt 19. .. As a result, the displacement of the stiffening plates 24a and 24b and the second gas seal plate 13 can be suppressed, and the deformation of the thin plate 13A of the second gas seal plate 13 can be further suppressed.

<Modification example>
The above embodiment can be modified as follows.
7A to 7C show states in which the dimensions of the stiffening plates 24a and 24b in the width direction (short direction) are changed.
In FIG. 7A, the widths of the stiffening plates 24a and 24b and the widths of the holding plates 22 have the same dimensions. As a result, parts management becomes easy and cost reduction can be achieved.

Further, as shown in FIGS. 7B and 7C, the widths of the stiffening plates 24a and 24b may be longer or shorter than the width of the presser plate 22 (FIG. 7B). .. The distance between the bending starting point c of the thin plate 13A by the stiffening plates 24a and 24b and the free end 13b of the thin plate 13A can be changed, and the bending rigidity of the thin plate 13A can be changed. Thereby, the elastic contact force between the first gas seal plate 11 and the second gas seal plate 13 can be adjusted. The contact force can be weakened by making the widths of the stiffening plates 24a and 24b longer than the width of the presser plate 22 as shown in FIG. 7B, and the contact force can be strengthened by shortening the width as shown in FIG. 7C. can.

Further, as shown in FIG. 8, the guide plate 30 having a bent shape or a curved shape is provided with the mounting plate 14 and the first stiffening plate 24a so as to guide the bent shape of the thin plate 13A of the second gas seal plate 13. It may be placed between and. As a result, the shape of the thin plate 13A that elastically contacts the first gas seal plate 11 can be maintained more appropriately. In FIG. 8, the thin plate 13A and the pressing plate 22 laminated on the first stiffening plate 24a are omitted.

In the above-described embodiment, the stiffening plates 24a and 24b are provided on both sides of the second gas seal plate 13, but the first stiffening plate 24a or the second stiffener is provided on either one of the second gas seal plates 13. A plate 24b may be provided.
Further, in the above-described embodiment, the configuration in which the sealing device is provided between the heat exchange unit 5 and the duct 2 has been described as an example, but the sealing device may be provided between the denitration device 6 and the inner wall of the duct 2. good.
Further, in the above-described embodiment, the configuration in which the mounting plate 14 is fixed to the inner liner 16 has been described as an example, but any configuration may be used as long as the mounting plate 14 is displaced due to thermal elongation or the like at the fixing position. For example, the mounting plate 14 may be fixed to the inner wall of the duct 2.

1 Exhaust heat recovery boiler 2 Duct 2a Wall 3 Duct inlet 4 Duct outlet 5 Heat exchange 6 Denitration device 7 Heat transfer tube 9 Drum 10 Baffle plate 11 1st gas seal plate (1st seal plate)
12 Sealing device 13 Second gas seal plate (second seal plate)
13A Thin plate 13a Fixed end 13b Free end 14 Mounting plate (mounting member)
16 Inner liner (liner member)
16a Plate-shaped member 17 Insulation material 18 Stud bolt 19 Embedded bolt (bolt)
20 Space 21 Nut 22 Presser plate 24a First stiffening plate (stiffening plate)
24b 2nd stiffening plate (stiffening plate)
25 Long hole 30 Guide plate c Bending starting point d Gap

Claims (8)

A sealing device that seals the passage of the heating gas between the baffle plate that partitions the inner wall of the duct through which the heating gas flows and the internal structure housed in the duct, and the inner wall.
A long first seal plate which is arranged so that the longitudinal direction is orthogonal to the flow direction of the heating gas and protrudes from the baffle plate toward the inner wall side of the duct.
The longitudinal direction is arranged along the longitudinal direction of the first seal plate, and the end portion in the lateral direction on the side of the first seal plate is a long thin plate that contacts the first seal plate as a free end. The second seal plate and
A plurality of mounting members for fixing the fixed end on the side opposite to the free end of the second seal plate, and
A holding plate that sandwiches and fixes the fixed end of the second seal plate with the mounting member, and
Equipped with
At least one of the plurality of mounting members is arranged side by side in a row at predetermined intervals from other adjacent mounting members.
A plate thickness that extends between the adjacent mounting members and is thicker than the thin plate between the mounting member and the second seal plate and / or between the presser plate and the second seal plate. A sealing device in which the stiffening plate is placed. The liner member is fixed to the inner wall, and the periphery of the plurality of plate-shaped members is partially overlapped with each other.
The sealing device according to claim 1, wherein at least one of the plurality of mounting members is arranged so as to straddle between the adjacent plate-shaped members of the liner member. A bolt that penetrates between the mounting member, the stiffening plate, the second seal plate, and the holding plate is provided.
The sealing device according to claim 2, wherein the bolt hole formed in the stiffening plate and the second sealing plate through which the bolt penetrates is an elongated hole in which the displacement direction of the liner member is the longitudinal direction. The sealing device according to any one of claims 1 to 3, wherein the width of the stiffening plate in the lateral direction is the same as the width of the holding plate in the lateral direction. The sealing device according to any one of claims 1 to 3, wherein the width of the stiffening plate in the lateral direction is longer or shorter than the width of the presser plate in the lateral direction. The exhaust heat recovery boiler provided with the sealing device according to any one of claims 1 to 5. A method for sealing an exhaust heat recovery boiler that seals the passage of the heated gas between the baffle plate that partitions the inner wall of the duct through which the heated gas flows and the internal structure housed in the duct and the inner wall. And
The exhaust heat recovery boiler is arranged so that the longitudinal direction is orthogonal to the flow direction of the heating gas, and has a long first sealing plate protruding from the baffle plate toward the inner wall side of the duct.
The longitudinal direction is arranged along the longitudinal direction of the first seal plate, and the end portion in the lateral direction on the side of the first seal plate is a long thin plate that contacts the first seal plate as a free end. The second seal plate and
A plurality of mounting members for fixing the fixed end on the side opposite to the free end of the second seal plate, and
A holding plate that sandwiches and fixes the fixed end of the second seal plate with the mounting member, and
Equipped with
At least one of the plurality of mounting members is arranged side by side in a row at predetermined intervals from other adjacent mounting members.
A plate thickness that extends between the adjacent mounting members and is thicker than the thin plate between the mounting member and the second seal plate and / or between the presser plate and the second seal plate. A method of sealing the exhaust heat recovery boiler in which the stiffening plate is placed. A liner member is provided in which the mounting member is fixed and fixed to the inner wall, and the periphery of the plurality of plate-shaped members is partially overlapped with each other.
The method for sealing an exhaust heat recovery boiler according to claim 7, wherein at least one of the plurality of mounting members is arranged so as to straddle between the adjacent plate-shaped members of the liner member.

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