WO2019225164A1

WO2019225164A1 - Boiler device and superheater

Info

Publication number: WO2019225164A1
Application number: PCT/JP2019/014624
Authority: WO
Inventors: 直樹竹内; 亨藪木; 裕昭市川; 誠治菊原
Original assignee: 三菱日立パワーシステムズ株式会社
Priority date: 2018-05-24
Filing date: 2019-04-02
Publication date: 2019-11-28
Also published as: JP2019203661A

Abstract

Provided is a boiler device capable of achieving a reduction in building height and a reduction in construction costs. A boiler device (1) comprises: a furnace (2); a rear heat transfer unit (3); a penthouse (4); a primary superheater (6); a secondary superheater (7); and a tertiary superheater (8). The secondary superheater (7) and the tertiary superheater (8) are suspended superheaters, and an upper section of a heat transfer tube (32) is connected to an inlet manifold (15a, 15b) or an outlet manifold (16) disposed in the penthouse (4) through a ceiling wall (34). The inlet manifold (15) has a two-part structure divided at a center portion in the furnace width direction, and is disposed in a straight line in the furnace width direction with a gap (27) in the inlet manifold.

Description

Boiler equipment and superheater

The present invention relates to a boiler device and a superheater.

In a penthouse of a boiler apparatus equipped with a suspension type superheater, a plurality of pipes to which a plurality of heat transfer pipes constituting the suspension type superheater are connected, and a manifold to which the plurality of pipes are connected Is arranged. The manifold includes an inlet manifold and an outlet manifold. Here, these are collectively referred to as “manifold”. The height of the penthouse from the ceiling wall of the boiler device to the suspension beam largely depends on the installation level of the manifold, and the installation level of the manifold is determined by the length of the heat transfer tube protruding on the ceiling wall. Furthermore, the length of the heat transfer tube protruding on the ceiling wall is determined within a range in which the heat transfer tube can be prevented from being damaged due to a difference in thermal expansion between the manifold and the ceiling wall.

That is, the suspended superheater is disposed in the combustion gas flow path of the boiler device, and the upper part of the heat transfer tube constituting the suspension is disposed in the penthouse through the ceiling wall. Although the ceiling wall is composed of tube walls, the amount of thermal expansion in the furnace width direction is larger in the manifold than in the ceiling wall, so that the thermal stress at the connection between the heat transfer tube and the pipe increases toward the side wall of the furnace. Occurs. In consideration of such circumstances, the length of the heat transfer tube protruding on the ceiling wall is determined such that the connection portion between the heat transfer tube and the pipe does not break even at the end in the furnace width direction. In addition, the connection structure of a manifold, a pipe header, and a heat transfer tube is disclosed in Patent Document 1.

Japanese Patent No. 4792355

By the way, the boiler device having the above-described configuration is required to reduce the building height and, consequently, the construction cost. For such a requirement, it is effective to reduce the penthouse height by shortening the length of the heat transfer tube protruding into the penthouse, but as described above, the length of the heat transfer tube protruding into the penthouse. Is determined from the viewpoint of preventing the heat transfer tube from being damaged due to the difference in thermal expansion between the manifold and the ceiling wall. Therefore, if the problem of the difference in thermal expansion is not solved, the length of the heat transfer tube protruding into the penthouse is shortened. It is not possible to reduce the building height and the construction cost.

The present invention has been made in order to solve the problems of the prior art, and an object of the present invention is to provide a boiler device and a superheater capable of realizing a reduction in building height and a reduction in construction cost. To do.

In order to achieve the above object, a representative present invention includes a furnace for burning fuel, a rear heat transfer section disposed on the rear side of the furnace with respect to a flow path of combustion gas generated in the furnace, A plurality of superheaters including a suspended superheater arranged on the flow path of the combustion gas, a connecting pipe connecting the plurality of superheaters to each other, and a ceiling portion of the furnace and the rear heat transfer unit And an upper part of the heat transfer tube constituting the suspended superheater passes through the ceiling wall of the furnace and the rear heat transfer unit, and is arranged in the inlet manifold or The inlet manifold is connected to an outlet manifold, and the inlet manifold includes a right inlet manifold that extends from a center portion in the furnace width direction to the right wall side of the furnace, and a left inlet manifold that extends from the center portion in the furnace width direction to the left wall side of the furnace. It is composed of, the right inlet manifold and said left inlet manifold is characterized by being arranged in a straight line in the furnace width direction with a gap.

According to the present invention, the building height of the boiler device can be reduced, and the construction cost can be reduced. Problems, configurations, and effects other than those described above will become apparent from the description of the embodiments described below.

1 is an overall configuration diagram of a boiler device according to an embodiment. It is a figure which shows typically the connection structure of the primary superheater, secondary superheater, and tertiary superheater with which the boiler apparatus which concerns on embodiment is equipped. It is a top view which shows the specific structure of the connecting pipe which connects the primary superheater which concerns on embodiment, a secondary superheater, and a tertiary superheater. It is a perspective view which shows the structure of the tertiary superheater which concerns on embodiment. It is the A section enlarged view of FIG. It is explanatory drawing which shows the inlet manifold setting height of the tertiary superheater which concerns on embodiment compared with the inlet manifold setting height of the tertiary superheater which concerns on a prior art example. It is explanatory drawing which shows the building height of the boiler apparatus which concerns on embodiment compared with the boiler apparatus which concerns on a prior art example.

Hereinafter, the boiler device and the superheater according to the embodiment will be described with reference to the drawings. In addition, embodiment described below shows a specific example at the time of implementing this invention, Comprising: The range of this invention is not restrict | limited to embodiment described below.

FIG. 1 is an overall configuration diagram of a boiler device according to an embodiment. As shown in FIG. 1, a boiler apparatus 1 of this example includes a furnace 2 that burns fuel, a rear heat transfer unit 3 that is disposed on the rear side of the furnace 2 with respect to a flow path of combustion gas generated in the furnace 2, and The penthouse 4 provided in the ceiling part of the furnace 2 and the rear heat transfer part 3 is provided. The furnace 2 and the rear heat transfer section 3 are suspended from a beam section 5a of the boiler steel frame 5 using a suspension rod and a suspension beam (not shown). The boiler building is constructed so as to cover the boiler steel frame 5 (not shown). In addition, as shown in FIG. 1, in this specification, when the furnace 2 side of the boiler apparatus 1 is referred to as the front of the can, the rear heat transfer section 3 side is referred to as the rear of the can, and the right side or the left side in the furnace width direction, It refers to the right or left side when viewed from the front.

The primary superheater 6 is installed in the rear heat transfer section 3. Further, a secondary superheater 7 and a tertiary superheater 8 are installed at a position where the combustion gas G generated in the furnace 2 is directed to the rear heat transfer unit 3. The primary superheater 6 is a so-called horizontal heat exchanger having a horizontal heat transfer surface, and the secondary superheater 7 and the tertiary superheater 8 are so-called suspensions having a suspended heat transfer surface. It is a mold heat exchanger. In the boiler apparatus 1 of this example, the tertiary superheater 8 is a final superheater provided at the final stage on the steam piping system of the boiler apparatus 1. In addition, although other heat exchangers, such as a economizer and a reheater, are installed in the required part of the furnace 2 and the rear heat-transfer part 3, these are well-known matters and are the present invention. Since it is not a gist, explanation is omitted.

FIG. 2 is a diagram schematically illustrating a connection structure of a primary superheater, a secondary superheater, and a tertiary superheater provided in the boiler device according to the embodiment. As shown in FIG. 2, the primary superheater 6 has an integrated structure including an inlet manifold 11 and an outlet manifold 12 that penetrate from the right wall side to the left wall side of the furnace 2. On the other hand, the secondary superheater 7 includes a right inlet manifold 13a and a left inlet manifold 13b extending from the center portion in the furnace width direction to the right wall side or the left wall side of the furnace 2, respectively, and from the center portion in the furnace width direction. Each has a two-part structure including a right outlet manifold 14a and a left outlet manifold 14b extending to the right wall side or the left wall side of the furnace 2, respectively. Further, the tertiary superheater 8 includes a right inlet manifold 15a and a left inlet manifold 15b extending from the center in the furnace width direction to the right wall side or the left wall side of the furnace 2, respectively, and from the right wall side to the left wall side of the furnace 2. It has a two-part structure including an outlet manifold 16 that passes therethrough. In the present specification, the right inlet manifold 15a and the left inlet manifold 15b may be collectively referred to as “inlet manifold 15”.

The primary superheater 6, the secondary superheater 7, and the tertiary superheater 8 are connected to each other using a connecting pipe. That is, as shown in FIG. 2, connecting

pipes

21a and 21b extending from the cage wall pipe are connected to the inlet manifold 11 of the primary superheater 6 at the left and right ends in the furnace width direction.

The right end of the outlet manifold 12 of the primary superheater 6 and the right end of the left inlet manifold 13b of the secondary superheater 7 are connected using a connecting pipe 22a. Further, the left end portion of the outlet manifold 12 of the primary superheater 6 and the left end portion of the right inlet manifold 13a of the secondary superheater 7 are connected using a connecting pipe 22b. The connecting

pipes

22a and 22b are provided with a spray 25 for adjusting the fluid temperature.

The right end of the left outlet manifold 14b of the secondary superheater 7 and the right end of the right inlet manifold 15a of the tertiary superheater 8 are connected using a connecting pipe 23a. Further, the left end of the right outlet manifold 14a of the secondary superheater 7 and the left end of the left inlet manifold 15b of the tertiary superheater 8 are connected using a connecting pipe 23b. The

communication pipes

23a and 23b are provided with a spray 26 for adjusting the fluid temperature.

One end of the connecting pipe 24a is connected to the right end of the outlet manifold 16 of the tertiary superheater 8, and one end of the connecting pipe 24b is connected to the left end of the outlet manifold 16 of the tertiary superheater 8. The other ends of the

communication pipes

24a and 24b are connected to a high-pressure turbine.

FIG. 3 is a plan view showing a specific configuration of a connecting pipe that connects the primary superheater, the secondary superheater, and the tertiary superheater according to the embodiment. As shown in FIG. 3, the connecting pipe 22 a has one end connected to the right end of the outlet manifold 12 of the primary superheater 6, the primary superheater right outlet connecting pipe 22 a 1, and one end connected to the left inlet of the secondary superheater 7. The secondary superheater right inlet communication pipe 22a2 is connected to the right end of the manifold 13b and the other end is connected to the other end of the primary superheater right outlet communication pipe 22a1. Similarly, the connecting pipe 22b has one end connected to the left end of the outlet manifold 12 of the primary superheater 6 and the left side of the right inlet manifold 13a of the secondary superheater 7 connected to the left side of the primary superheater left outlet connecting pipe 22b1. The secondary superheater left inlet communication pipe 22b2 is connected to the end and the other end is connected to the other end of the primary superheater left outlet communication pipe 22b1.

The connecting pipe 23a has one end connected to the right end of the left outlet manifold 14b of the secondary superheater 7 and the right end of the right inlet manifold 15a of the tertiary superheater 8 at one end. The secondary superheater right side inlet communication pipe 23a2 is connected to the other end of the secondary superheater right side outlet communication pipe 23a1. Similarly, the connecting pipe 23b has one end connected to the left end of the right outlet manifold 14a of the secondary superheater 7 and the left side outlet manifold 23b1 of the secondary superheater 8 and one end connected to the left inlet manifold 15b of the tertiary superheater 8. The third superheater left inlet communication pipe 23b2 is connected to the other left end of the secondary superheater left outlet communication pipe 23b1. In addition, the arrow of FIG. 3 has shown the flow direction of the internal fluid (superheated steam) of each connecting pipe.

FIG. 4 is a perspective view showing the configuration of the tertiary superheater according to the embodiment, and FIG. 5 is an enlarged view of part A of FIG. As shown in FIGS. 4 and 5, the tertiary superheater 8 according to the embodiment includes a right inlet manifold 15 a, a left inlet manifold 15 b, an outlet manifold 16, and a plurality of pipes 31 with one end welded to each manifold. It consists mainly of a plurality of heat transfer tubes (leg tubes) 32 welded at both ends for each group of pipes 31 to be welded.

The right inlet manifold 15a, the left inlet manifold 15b, and the outlet manifold 16 are installed in the penthouse 4 in the furnace width direction. The right inlet manifold 15a and the left inlet manifold 15b are arranged in a straight line with a gap 27 having a predetermined dimension between the left end of the right inlet manifold 15a and the right end of the left inlet manifold 15b. Of course, the left end of the right inlet manifold 15a and the right end of the left inlet manifold 15b are closed using a plate material or the like. The gap 27 is arranged at the center position (boiler center) in the furnace width direction. That is, the inlet manifold 15 of the tertiary superheater 8 is divided into two at the center in the length direction. Further, the gap 27 is set to a size such that the right inlet manifold 15a and the left inlet manifold 15b do not contact each other regardless of the internal fluid temperature in the right inlet manifold 15a and the left inlet manifold 15b.

The outlet manifold 16 is disposed above the right inlet manifold 15a and the left inlet manifold 15b in parallel with the right inlet manifold 15a and the left inlet manifold 15b.

The pipe 31 is welded at equal intervals in the length direction of the right inlet manifold 15a, the left inlet manifold 15b, and the outlet manifold 16. The nozzles 31 welded to the right inlet manifold 15a and the left inlet manifold 15b are arranged horizontally toward the front side of the can. On the other hand, the nozzle 31 welded to the outlet manifold 16 is horizontally arranged toward the rear side of the can. Both ends of a plurality of heat transfer tubes 32 formed in a U-shape are welded in the length direction of the set of nozzles 31 protruding to the front side and the rear side of the can. Thereby, in the length direction of the right inlet manifold 15a, the left inlet manifold 15b, and the outlet manifold 16, heat transfer panels 33 formed in a U-shaped panel shape with a combination of a plurality of heat transfer tubes 32 are formed at equal intervals. Is done.

The combustion gas G flows from the front side of the can to the rear side of the can through the gaps between the heat transfer panels 33 arranged adjacent to each other. Thereby, heat exchange between the combustion gas G and the internal fluid of the tertiary superheater 8 is performed.

As shown in FIGS. 4 and 5, the upper part of the heat transfer tube 32 constituting the heat transfer panel 33 penetrates the ceiling wall 34 and is arranged in the penthouse 4.

Hereinafter, effects of the boiler device 1 according to the embodiment will be described.

FIG. 6 is an explanatory diagram showing the inlet manifold setting height of the tertiary superheater according to the embodiment in comparison with the inlet manifold setting height of the tertiary superheater according to the conventional example. The left figure of Fig.6 (a) is the figure which looked at the tertiary superheater which concerns on a prior art example from the can front side, The right figure of Fig.6 (a) is the figure which looked at the tertiary superheater which concerns on a prior art example from the right side wall side. It is. The left figure of FIG.6 (b) is the figure which looked at the tertiary superheater which concerns on embodiment from the can front side, The right figure of FIG.6 (b) is the figure which looked at the tertiary superheater which concerns on embodiment from the right side wall side. It is. The boiler apparatus 1 according to the embodiment has a two-part structure in which the inlet manifold 15 of the tertiary superheater 8 is divided into a right inlet manifold 15a and a left inlet manifold 15b at the boiler center. On the other hand, in the boiler apparatus 100 according to the conventional example, the inlet manifold 15 of the tertiary superheater 8 has an integral structure.

The difference in thermal expansion between the inlet manifold 15 and the ceiling wall 34 of the tertiary superheater 8 in the furnace width direction increases in proportion to the length of the inlet manifold 15. The inlet manifold 15 of the tertiary superheater 8 according to the conventional example has an integral structure, and the inlet manifold 15 of the tertiary superheater 8 according to the embodiment has a two-part structure divided at the center of the boiler. In the tertiary superheater 8 according to the example, the thermal stress acting on the connection portion between the header 31 and the heat transfer tube 32 at both the left and right end portions of the inlet manifold 15 becomes larger than the tertiary superheater 8 according to the embodiment.

For this reason, in the tertiary superheater 8 which concerns on a prior art example, in order to relieve | moderate the thermal stress which acts on the connection part of the header 31 and the heat exchanger tube 32 by making it easy to bend the heat exchanger tube 32, as shown to Fig.6 (a). In addition, it is necessary to increase the height from the ceiling wall 34 to the inlet manifold 15 of the tertiary superheater 8, that is, the inlet manifold setting height H1. On the other hand, the inlet manifold 15 of the tertiary superheater 8 according to the embodiment has a smaller thermal stress acting on the connecting portion between the pipe 31 and the heat transfer tube 32 than the tertiary superheater 8 according to the conventional example. The amount of bending of the heat transfer tube 32 for relaxing the stress can be reduced. Therefore, the tertiary superheater 8 according to the embodiment can reduce the inlet manifold set height H2 as is apparent from the comparison between FIG. 6A and FIG.

FIG. 7 is an explanatory diagram showing the building height of the boiler device according to the embodiment in comparison with the boiler device according to the conventional example. The left figure of FIG. 7 is a figure which shows the building height of the boiler apparatus which concerns on a prior art example, and the right figure of FIG. 7 is a figure which shows the building height of the boiler apparatus which concerns on embodiment. As described above, since the inlet manifold setting height H2 of the tertiary superheater 8 according to the embodiment can be smaller than the inlet manifold setting height H1 of the tertiary superheater 8 according to the conventional example, the height dimension of the penthouse 4 is also high. It can be lowered according to the difference (H1-H2) in the set height of each inlet manifold. Moreover, as a result of being able to reduce the height dimension of the penthouse 4, the boiler device 1 according to the embodiment can reduce the construction height of the boiler steel frame 5, and thus the construction height of the boiler building, as compared with the boiler device 100 according to the conventional example. . Thereby, the boiler apparatus 1 which concerns on embodiment can reduce a construction cost compared with the boiler apparatus 100 which concerns on a prior art example.

The boiler device 1 according to the embodiment connects the right end portion of the left outlet manifold 14b of the secondary superheater 7 and the right end portion of the right inlet manifold 15a of the tertiary superheater 8 using the connecting pipe 23a. Since the left end of the right outlet manifold 14a of the secondary superheater 7 and the left end of the left inlet manifold 15b of the tertiary superheater 8 are connected using the connecting pipe 23b, the internal fluids on the left and right of the tertiary superheater 8 are connected. Temperature deviation can be suppressed or eliminated.

That is, even when the temperature distribution of the combustion gas occurs in the furnace width direction and the temperature of the internal fluid of the secondary superheater 7 varies in the horizontal direction of the furnace 2, the connecting

pipes

23a and 23b are connected as described above. As a result, in the tertiary superheater 8, the low-temperature internal fluid output from the secondary superheater 7 is introduced to the side where the combustion gas temperature is high, and the high-temperature internal fluid output from the secondary superheater 7 to the side where the combustion gas temperature is low. Since the fluid is introduced and heat exchange is performed, the temperature difference of the internal fluid temperature at the outlet of the tertiary superheater 8 can be reduced or eliminated in the left-right direction of the furnace 2. Therefore, the temperature deviation of the internal fluid flowing through the two main steam pipes (

communication pipes

24a and 24b) guided from the left and right of the outlet manifold 16 of the tertiary superheater 8 to the high pressure turbine can be reduced or eliminated.

Furthermore, the boiler device 1 according to the embodiment has a secondary superheater 7 and a tertiary superheater 8 in a two-part structure, and the right end portion of the outlet manifold 12 of the primary superheater 6 and the left inlet manifold 13b of the secondary superheater 7. Are connected using a connecting pipe 22a, and the left end of the outlet manifold 12 of the primary superheater 6 and the left end of the right inlet manifold 13a of the secondary superheater 7 are connected using a connecting pipe 22b. In addition to connecting, the right end of the left outlet manifold 14b of the secondary superheater 7 and the right end of the right inlet manifold 15a of the tertiary superheater 8 are connected using a connecting pipe 23a, and the right side of the secondary superheater 7 is connected. Since the left end of the outlet manifold 14a and the left end of the left inlet manifold 15b of the tertiary superheater 8 are connected using the connecting pipe 23b, the secondary superheater 7 and the tertiary superheater 8 are integrated. It can reduce the total extension of the various connecting pipe in comparison with the case.

That is, if the secondary superheater 7 and the tertiary superheater 8 have an integrated structure similar to that of the primary superheater 6, the primary superheater 6 and the secondary superheater are used to reduce or eliminate the influence of temperature deviation in the furnace width direction. 7 and the secondary superheater 7 and the tertiary superheater 8 are connected to the rack, the total extension of the connecting pipes connecting the

superheaters

6, 7, 8 is , 7 and 8 are double the total length of the connecting pipe when not connected to the rack. Therefore, according to the boiler apparatus 1 which concerns on embodiment, the total extension of a connecting pipe can be made as short as possible, and the design of the boiler apparatus 1 can be made easy and construction cost can be reduced.

It should be noted that the scope of the present invention is not limited to the above-described embodiment, and includes those in which the above-described embodiment is appropriately changed, added, or deleted without changing the gist of the present invention. For example, in the above-described embodiment, the

inlet manifolds

13a and 13b and the

outlet manifolds

14a and 14b of the secondary superheater 7 and the

inlet manifolds

15a and 15b of the tertiary superheater 8 are each divided into two structures. The

inlet manifolds

13a and 13b and the

outlet manifolds

14a and 14b may be integrated. Also in this case, since the

inlet manifolds

15a and 15b of the tertiary superheater 8 having the highest internal fluid temperature as compared with other suspended superheaters have a two-part structure, an effect of reducing the building height can be realized. .

DESCRIPTION OF SYMBOLS 1 Boiler apparatus 2 Furnace 3 Rear heat transfer part 4 Penthouse 5 Boiler steel frame 6 Primary superheater 7 Secondary superheater 8 Tertiary superheater 11 Primary superheater inlet manifold 12 Primary

superheater outlet manifold

13a, 13b Secondary

superheater Inlet manifold

14a, 14b Secondary

superheater outlet manifold

15a, 15b Tertiary superheater inlet manifold 16 Tertiary

superheater outlet manifold

21a,

21b Connecting pipe

22a,

22b Connecting pipe

23a,

23b Connecting pipe

24a, 24b Connecting pipe 27 Gap 31 tube 32 heat transfer tube (leg tube)
33 Heat transfer panel 34 Ceiling wall

Claims

A furnace for burning fuel, a rear heat transfer section disposed on the rear side of the furnace with respect to a flow path of combustion gas generated in the furnace, and a suspended superheater disposed on the flow path of the combustion gas Including a plurality of superheaters, a connecting pipe connecting the plurality of superheaters to each other, and a penthouse provided on a ceiling of the furnace and the rear heat transfer section,
The upper part of the heat transfer tube constituting the suspended superheater passes through the ceiling wall of the furnace and the rear heat transfer unit, and is connected to an inlet manifold or an outlet manifold arranged in the penthouse,
The inlet manifold is composed of a right inlet manifold that extends from the center portion in the furnace width direction to the right wall side of the furnace, and a left inlet manifold that extends from the center portion in the furnace width direction to the left wall side of the furnace, The boiler device, wherein the right inlet manifold and the left inlet manifold are arranged in a straight line in the furnace width direction through a gap.
The boiler device according to claim 1,
The suspended superheater is a final superheater provided in a final stage of a steam piping system.
The boiler device according to claim 2,
In the flow path of the combustion gas, a secondary superheater and a tertiary superheater as the final superheater are arranged from the upstream side to the downstream side in the flow direction of the combustion gas, and the secondary superheater The inlet manifold, the outlet manifold, and the inlet manifold of the tertiary superheater have a two-part structure divided at the center in the furnace width direction, and the right end of the left outlet manifold of the secondary superheater and the tertiary superheater The right end of the right inlet manifold of the secondary superheater is connected using a connecting pipe, and the left end of the right outlet manifold of the secondary superheater and the left end of the left inlet manifold of the tertiary superheater are connected with other connecting pipes. Boiler device characterized by being connected using.
In the boiler apparatus according to claim 3,
A primary superheater is disposed in the rear heat transfer section, and the primary superheater has a monolithic outlet manifold configured in a series in the furnace width direction, and the outlet superheater of the primary superheater The right end and the right end of the left inlet manifold of the secondary superheater are connected using a connecting pipe, and the left end of the outlet manifold of the primary superheater and the left side of the right inlet manifold of the secondary superheater A boiler device characterized in that the end portion is connected using another connecting pipe.
Among a plurality of superheaters for generating superheated steam to be supplied to the steam turbine, it is a suspended superheater arranged in the final stage of the superheated steam system,
A straight tubular inlet manifold into which steam from the superheater is arranged upstream of the suspended superheater with respect to the superheated steam system;
A straight tubular outlet manifold to which a main steam pipe through which the superheated steam flows is connected to the steam turbine;
The inlet manifold is composed of a right inlet manifold that extends from the center portion in the furnace width direction to the right wall side of the furnace, and a left inlet manifold that extends from the center portion in the furnace width direction to the left wall side of the furnace, The right inlet manifold and the left inlet manifold are arranged in a straight line through the gap in the furnace width direction, and a plurality of headers on which a plurality of heat transfer tubes are suspended branch in the longitudinal direction toward the boiler front side. And
In the outlet manifold, a plurality of headers from which a plurality of heat transfer tubes are suspended are branched in the longitudinal direction toward the rear side of the boiler, and are arranged in a straight line above the right inlet manifold and the left inlet manifold. A superheater characterized by