JP6748567B2 - boiler - Google Patents

Description

The present invention relates to a boiler that burns fuel to generate steam.

A general marine boiler includes a furnace, a burner, a front bank tube, a superheater, a group of evaporation tubes, a water drum, a steam drum, and the like. Therefore, the combustion gas generated by the combustion of the burner exchanges heat by coming into contact with the front bank tube, the superheater, and the evaporation tube group from the furnace, and is discharged from the gas outlet. At this time, the steam collected in the steam drum is superheated by the superheater to become superheated steam, which is supplied to a predetermined driving device to drive it.

In the superheater, a large number of heat transfer tubes are arranged vertically or horizontally, and when the steam supplied to the inlet header flows through the plurality of heat transfer tubes, it is superheated by the combustion gas to become superheated steam. As such a boiler, for example, there is one described in Patent Document 1 below.

Japanese Patent No. 3875933

In a superheater in which a large number of heat transfer tubes are arranged in the horizontal direction, generally, end portions in the longitudinal direction of each heat transfer tube are supported by a support member. Therefore, in each heat transfer tube, the intermediate portion in the longitudinal direction hangs down due to its own weight, and bending stress acts on the heat transfer tube, which may reduce durability. The boiler of Patent Document 1 described above has a problem that the structure is complicated because the heat transfer tubes are suspended and supported.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a boiler that improves the durability of a heat transfer tube and simplifies the structure.

A boiler of the present invention for achieving the above object is a combustion container provided with a gas outlet, a burner provided in a position apart from the gas outlet in the combustion container to burn fuel, the burner and the burner. A superheater having a plurality of heat transfer tubes arranged between the gas outlet and parallel to the installation surface of the combustion container, a support member supporting a part of the plurality of heat transfer tubes in the longitudinal direction, and the inside of the combustion container And a support base provided at a lower portion for supporting the support member.

Therefore, the plurality of heat transfer tubes parallel to the installation surface of the combustion container are supported in part in the longitudinal direction by the support member, and the support member is supported by the support base provided in the lower portion in the combustion container. Therefore, the plurality of heat transfer tubes are suppressed from hanging down due to their own weight and bending stress is applied, the durability of the heat transfer tubes can be improved, and the structural members such as suspenders are not required and the structure can be simplified. You can

The boiler of the present invention is characterized in that the support base is a refractory material filled in a space formed between the bottom of the combustion container and the plurality of heat transfer tubes.

Therefore, since the support base is filled as a refractory material in the space between the bottom of the combustion container and the plurality of heat transfer tubes, the combustion gas passes through the space between the bottom of the combustion container and the plurality of heat transfer tubes and exits from the gas outlet side. Bypassing is suppressed, and the heat exchange performance can be improved by bringing the combustion gas into contact with the plurality of evaporation tubes and the plurality of heat transfer tubes to efficiently exchange heat.

In the boiler of the present invention, the refractory material is characterized in that a part of the plurality of heat transfer tubes penetrates.

Therefore, since a part of the plurality of heat transfer tubes penetrates the refractory material, it is possible to properly close the space between the bottom of the combustion container and the plurality of heat transfer tubes by the refractory material, and the heat transfer tube The rigidity can be secured by supporting a part.

In the boiler of the present invention, one end of the plurality of heat transfer tubes is connected to an inlet header and the other end is connected to an outlet header, and the support member is provided between the inlet header and the outlet header. It is characterized in that one or more locations in the longitudinal direction of the heat pipe are supported.

Therefore, the plurality of heat transfer tubes are supported by the support member at one or more positions in the longitudinal direction between the inlet header and the outlet header, so that the sagging of each heat transfer tube due to its own weight is efficiently suppressed and bending stress is reduced. Occurrence can be suppressed.

In the boiler of the present invention, the plurality of heat transfer tubes are arranged at a predetermined interval in the fuel gas ejection direction of the burner, and the support member is arranged between the plurality of heat transfer tubes. ..

Therefore, by disposing the support members between the plurality of heat transfer tubes, the weights of the plurality of heat transfer tubes can be efficiently supported, and the size of the support members can be reduced.

In the boiler of the present invention, the support member is fixed to one of the heat transfer tubes facing the fuel gas ejection direction of the burner and abuts on the other.

Therefore, since the support member is fixed to the heat transfer tube on one side and abuts on the other heat transfer tube, when the heat transfer tube is thermally expanded and deformed, the thermal expansion amount and the thermal deformation amount of the upper and lower heat transfer tubes are different. However, since the support member follows the fixed heat transfer tubes, bending stress or the like does not act on each heat transfer tube, and the durability can be improved.

The boiler of the present invention is characterized in that the support member is provided with an opening that connects the upstream side and the downstream side of the gas flow direction in the superheater.

Therefore, since the support member is provided with the opening, the combustion gas flows through the opening, and the heat transfer tube is uniformly heated, so that the generation of thermal stress can be suppressed and the durability is improved. Can be improved.

According to the boiler of the present invention, since a plurality of support members that support the intermediate portions in the longitudinal direction of the plurality of horizontal heat transfer tubes and a support base that is provided in the lower portion of the combustion container to support the plurality of support members are provided. The durability of the heat transfer tube can be improved, and the structure can be simplified by omitting the structural members such as suspenders.

FIG. 1 is a schematic diagram showing the boiler of this embodiment. FIG. 2 is a sectional view taken along the line II-II of FIG. 1 showing a plan view of the superheater. FIG. 3 is a sectional view taken along the line III-III in FIG. 1 showing a front view of the superheater. FIG. 4 is a schematic diagram showing a modified example of the superheater. FIG. 5 is a schematic view showing a support structure of the heat transfer tube by the support member. FIG. 6 is a schematic view showing the action of the support structure of the heat transfer tube by the support member. FIG. 7 is a schematic view of a support structure of a heat transfer tube showing a modified example of the support member.

Hereinafter, preferred embodiments of a boiler according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to this embodiment, and when there are a plurality of embodiments, the present invention also includes those configured by combining the embodiments.

The boiler of the present embodiment will be described as a marine boiler used for a marine vessel. Specifically, a case where the boiler is used as an auxiliary boiler that drives a generator will be described. However, the boiler is not limited to the auxiliary boiler that drives the generator, and for example, in the case of a ship, a main engine boiler that becomes a power source during navigation, a crane, and other auxiliary boilers that operate machines installed in the ship. Can also be used as Further, the boiler is not limited to the one for ships, and can be used for boilers for various purposes.

1 is a schematic view showing the boiler of the present embodiment, FIG. 2 is a sectional view taken along the line II-II of FIG. 1 showing a plan view of the superheater, and FIG. 3 is a view showing a front view of the superheater III- of FIG. III sectional view and FIG. 4 are schematic views showing a modification of the superheater.

As shown in FIG. 1, the boiler 10 of the present embodiment includes a combustion container 11, a burner 12, an evaporator 13, and a superheater 14.

The combustion container 11 has a hollow box shape and includes a ceiling portion 11a, a bottom portion 11b, a front wall portion 11c, a rear wall portion 11d, and a pair of side wall portions 11e and 11f (see FIG. 3). The combustion container 11 has an air inlet 21 formed on the front wall portion 11c and a gas outlet 22 formed on the rear wall portion 11d side of the ceiling portion 11a. The combustion container 11 is provided with a plurality of legs 23 on the lower surface of the bottom 11b.

The burner 12 is provided on the front wall portion 11c side of the ceiling portion 11a at a position separated from the gas outlet 22. The burner 12 ejects fuel gas toward the combustion chamber 24 surrounded by the ceiling portion 11a, the bottom portion 11b, the front wall portion 11c, and the superheater 14 to burn the fuel gas to form the flame F. You can The combustion chamber 24 is configured by being partitioned by a ceiling portion 11a, a bottom portion 11b, a front wall portion 11c, respective side wall portions 11e and 11f, and a front bank tube 28 described later, the air inlet 21 communicates with the burner 12, and the burner 12 faces. There is.

The evaporator 13 is composed of an evaporation tube group in which a plurality of evaporation tubes 25 are bundled. The plurality of evaporation pipes 25 are arranged in the combustion container 11 along the fuel gas ejection direction of the burner 12, the lower end is connected to the water drum 26 supported by the bottom 11b, and the upper end is supported by the ceiling 11a. Connected to the steam drum 27. Further, in the evaporator 13, the front bank tube 28 is arranged by disposing a part of the evaporation pipe 25 so as to be bent toward the front wall portion 11c, and is arranged between the evaporator 13 and the front bank tube 28. A space 29 is provided.

The superheater 14 is composed of a heat transfer tube group in which a plurality of heat transfer tubes 30 are bundled. The plurality of heat transfer tubes 30 are arranged in the combustion container 11 along the direction of the installation surface of the fuel container 11, one end of which is connected to the inlet header 31 (see FIG. 3) through the one side wall 11e. The other end passes through the other side wall 11f and is connected to the outlet header 32 (see FIG. 3). The inlet header 31 and the outlet header 32 are arranged outside the combustion container 11. The superheater 14 is arranged in an arrangement space 29 provided between the plurality of evaporation pipes 25 and the front bank tube 28. Further, the combustion container 11 is provided with an exhaust chamber 33 defined by a ceiling portion 11a, a bottom portion 11b, a rear wall portion 11d, side wall portions 11e and 11f, and an evaporation pipe 25. The gas outlet 22 communicates with the exhaust chamber 33.

Therefore, in the boiler 10, the combustion chamber 24, the front bank tube 28, the superheater 14, the evaporator 13, and the exhaust chamber 33 are arranged in this order from the burner 12 toward the gas outlet 22.

Therefore, the burner 12 injects and combusts the fuel gas into the combustion chamber 24 to form the flame F and generate the combustion gas G. The generated combustion gas G flows from the front wall portion 11c side of the combustion container 11 to the rear wall portion 11d side. At this time, the combustion gas G sequentially passes from the combustion chamber 24 through the region in which the front bank tube 28 is arranged, the region in which the superheater 14 is arranged, and the region in which the evaporator 13 is arranged to reach the exhaust chamber 33. The front bank tube 28, the superheater 14, and the evaporator 13 are heat exchangers, respectively, which perform heat exchange with the combustion gas G when the combustion gas G passes therethrough, and transfer the heat of the combustion gas G. The temperature of water and steam (heat medium) that is collected and circulated inside is raised.

The front bank tube 28 is arranged on the burner 12 side of the combustion container 11, that is, in a region where the temperature inside the combustion container 11 is high. The front bank tube 28 is connected to the water drum 26 and the steam drum 27, and water and steam circulate inside. The front bank tube 28 recovers the heat of the combustion gas G by exchanging heat between the combustion gas G and water or steam to raise the temperature of the water or steam and lower the temperature of the combustion gas G.

The superheater 14 has a plurality of heat transfer tubes 30, and is arranged closer to the gas outlet 22 than the front bank tube 28 in the combustion container 11. The combustion gas G that has passed through the region where the front bank tubes 28 are arranged passes through the superheater 14. In the superheater 14, an inlet header 31 and an outlet header 32 are connected to each end of a plurality of heat transfer tubes 30, and water or steam flows in each heat transfer tube 30. When the superheater 14 flows from the inlet header 31 through the heat transfer tubes 30 to the outlet header 32, the heat of the combustion gas G is recovered by heat exchange between the combustion gas G and the water or steam, so that the water or steam is recovered. The temperature of the combustion gas G is decreased and the temperature of the combustion gas G is decreased.

The evaporator 13 has a plurality of evaporation pipes 25 and is arranged closer to the gas outlet 22 than the superheater 14 in the combustion container 11. The combustion gas G that has passed through the region where the superheater 14 is arranged passes through the evaporator 13. In the evaporator 13, a water drum 26 and a steam drum 27 are connected to respective ends of a plurality of evaporation pipes 25, and water and steam are circulated in the evaporation pipes 25. When the evaporator 13 flows from the water drum 26 through the respective evaporation pipes 25 to the steam drum 27, the heat of the combustion gas G is recovered by heat exchange between the combustion gas G and the water or steam, whereby the water or steam is recovered. The temperature of the combustion gas G is decreased and the temperature of the combustion gas G is decreased. That is, the combustion gas G heats the water and steam in each evaporation pipe 25, so that only the steam rises and reaches the steam drum 27.

The heat of the combustion gas G that has passed through the evaporator 13 is recovered, the temperature of the combustion gas G is lowered, and the temperature of the combustion gas G reaches the exhaust chamber 33.

The boiler 10 burns the fuel gas in the burner 12 to generate the combustion gas G, and the front bank tube 28 and the evaporator 13 exchange heat with the combustion gas G and water or steam to raise the temperature of the water and steam. The steam is stored in the steam drum 27. Then, the steam of the steam drum 27 is superheated by the superheater 14 to become superheated steam. The boiler 10 is driven and rotated by supplying this superheated steam to a turbine (not shown), and the generator generates electricity.

The boiler 10 of this embodiment includes a plurality of support members 41 and a support base 42. As shown in FIGS. 1 to 3, in the superheater 14, a plurality of heat transfer tubes 30 are arranged along the direction of the installation surface of the fuel container 11, and are arranged at predetermined intervals in the fuel gas ejection direction of the burner 12. .. Further, one heat transfer tube 30 is arranged along the horizontal direction and bent in the horizontal direction by 360 degrees so as to be parallel to each other at a predetermined interval in the direction of the installation surface of the fuel container 11. Each heat transfer tube 30 has one end in the longitudinal direction connected to the inlet header 31 and the other end connected to the outlet header 32.

Between the inlet header 31 and the outlet header 32, the plurality of support members 41 support one location of the intermediate portion (a part) in the longitudinal direction of the plurality of heat transfer tubes 30. Since each heat transfer tube 30 has a predetermined length and each end is connected to the inlet header 31 and the outlet header 32, the intermediate portion in the longitudinal direction is deformed so as to hang down and curve due to its own weight. End up. Therefore, in the present embodiment, each support member 41 supports the intermediate portion in the longitudinal direction of each heat transfer tube 30 to suppress deformation of each heat transfer tube 30. Each of the support members 41 is arranged between the heat transfer tubes 30 and has an upper surface fixed to the upper heat transfer tube 30 and a lower surface fixed to the lower heat transfer tube 30. The heat transfer tube 30 is arranged along the direction of the installation surface of the fuel container 11. In the present embodiment, the heat transfer tube 30 has a shape that is bent and folded back in the direction of the installation surface of the fuel container 11, and the support member 41 includes a plurality of heat transfer tubes (parallel to one heat transfer tube 30). In the embodiment, three linear portions are supported.

In this case, the support member 41 may have a flat upper surface and a lower surface, or may have a groove having a semicircular cross-sectional shape in which the heat transfer tube 30 is fitted, on the upper surface and the lower surface. Further, the plurality of support members 41 arranged in the fuel gas ejection direction of the burner 12 may be separated from each other or may be in contact with each other. In this case, it is desirable that the heat transfer tube 30 has a shape in which the combustion chamber 24 is exposed and the support member 41 does not cover the combustion chamber 24 side of the heat transfer tube 30 so as not to reduce the heat exchange efficiency.

The support base 42 is provided in the lower portion of the combustion container 11 and supports the plurality of support members 41. The support base 42 is a refractory material (for example, refractory brick) filled in the space between the bottom portion 11b of the combustion container 11 and the plurality of heat transfer tubes 30. That is, in the evaporator 13, a plurality of evaporation pipes 25 are arranged between the water drum 26 and the steam drum 27 along the fuel gas ejection direction of the burner 12, and some of the evaporation pipes 25 are disposed in the front wall portion 11c. The front bank tube 28 is configured by being bent and disposed to the side. The plurality of heat transfer tubes 30 configuring the superheater 14 are arranged in the arrangement space portion 29 provided between the plurality of evaporation tubes 25 and the front bank tube 28. Therefore, in the combustion container 11, particularly, a space below the superheater 14 (the plurality of heat transfer tubes 30) becomes a dead space, and it becomes difficult to dispose the evaporation tube 25 and the heat transfer tube 30. Then, the combustion gas G in the combustion chamber 24 passes through this dead space without passing through the superheater 14 and the evaporator 13, and the heat exchange efficiency is reduced.

Therefore, in the present embodiment, the dead space is filled by disposing the support base (refractory material) 42 below the superheater 14 (the plurality of heat transfer tubes 30). That is, the support base 42 has a lower surface installed on the bottom portion 11b, a side surface closely attached to each of the side wall portions 11e and 11f, and an upper surface arranged to face the lowermost heat transfer tube 30 with a predetermined gap therebetween. The lowermost support member 41 is arranged (fixed) at. That is, the weight of the plurality of support members 41 is supported by the support base 42. In this case, a part (lower part) of the evaporation tube 25 that constitutes the front bank tube 28 is embedded in the support base 42, and a part of the heat transfer tube 30 penetrates the support base 42. Therefore, the dead space below the superheater 14 is closed by the support base (refractory material) 42, and the combustion gas G in the combustion chamber 24 appropriately passes through the superheater 14 and the evaporator 13.

In addition, in the present embodiment, the plurality of support members 41 are configured to support one location of the intermediate portions in the longitudinal direction of the plurality of heat transfer tubes 30, but the configuration is not limited to this configuration. For example, as shown in FIG. 4, a plurality of support members 41 may be configured to support a plurality of locations (three locations) in the longitudinal middle portion of the plurality of heat transfer tubes 30.

Although the support member 41 is configured to be fixed to the heat transfer tube 30, the configuration is not limited to this. FIG. 5 is a schematic diagram showing the support structure of the heat transfer tube by the support member, and FIG. 6 is a schematic diagram showing the action of the support structure of the heat transfer tube by the support member.

As shown in FIG. 5, in the support member 41, the lower surface 41b is fixed to the outer peripheral surface of the heat transfer tube 30, and the upper surface 41a is abutted on the outer peripheral surface of the heat transfer tube 30 without being fixed. The heat transfer tube 30 may be heated by the contact of the combustion gas G to cause thermal expansion and thermal deformation, and the thermal expansion amount and the thermal deformation amount may differ between the upper and lower heat transfer tubes 30. Here, in the support member 41, the lower surface 41b is fixed to the outer peripheral surface of the heat transfer tube 30, and the upper surface 41a is only in contact with the outer peripheral surface of the heat transfer tube 30, and as shown in FIG. Even if the amount of thermal expansion and the amount of thermal deformation of 30 differ, each support member 41 follows the heat transfer tube 30 with the lower surface 41b fixed, and therefore, no bending stress or the like acts on each heat transfer tube 30.

Furthermore, although the support member 41 is configured as a block body, it is not limited to this configuration. FIG. 7 is a schematic view of a support structure of a heat transfer tube showing a modified example of the support member.

As shown in FIG. 7, the support member 51 is provided with an opening 52 that connects the upstream side and the downstream side in the flow direction of the combustion gas G in the superheater 14. That is, the support member 51 is composed of two vertical members 51a along the fuel gas ejection direction of the burner 12, and a horizontal member 51b along the horizontal direction connecting the longitudinal intermediate portions of the two vertical members 51a. By doing so, two openings 52 are provided. The lower surface of the support member 51 is fixed to the outer peripheral surface of the heat transfer tube 30, and the upper surface thereof is abutted on the outer peripheral surface of the heat transfer tube 30 without being fixed.

Although the lower surfaces of the support members 41 and 51 are fixed to the outer peripheral surface of the heat transfer tube 30 and the upper surfaces thereof are in contact with the outer peripheral surface of the heat transfer tube 30, the upper surfaces of the support members 41 and 51 are fixed to the outer peripheral surface of the heat transfer tube 30. However, the lower surface may contact the outer peripheral surface of the heat transfer tube 30. Further, the upper and lower surfaces of the support members 41 and 51 may be brought into contact with the outer peripheral surface of the heat transfer tube 30 without being fixed, and the upper and lower support members 41 and 51 may be connected to each other.

As described above, in the boiler of the present embodiment, the combustion container 11 having the gas outlet 22 is provided, the burner 12 provided at a position separated from the gas outlet 22 in the combustion container 11 to burn the fuel, and the burner 12 And an evaporator 13 having a plurality of evaporation pipes 25 arranged between the gas outlet 22 and the burner 12 and the evaporator 13 (gas outlet 22) are arranged parallel to the installation direction of the combustion vessel 11. A superheater 14 having a plurality of heat transfer tubes 30, a support member 41 that supports intermediate portions of the plurality of heat transfer tubes 30 in the longitudinal direction, and a support base 42 that is provided in a lower portion of the combustion container 11 and supports the support members 41. And are provided.

Therefore, in the plurality of heat transfer tubes 30 arranged along the horizontal direction, the middle portion in the longitudinal direction is supported by the plurality of support members 41, and the plurality of support members 41 are provided in the lower portion of the combustion container 11 at the support base 42. Will be supported by. Therefore, the plurality of heat transfer tubes 30 are prevented from being subjected to bending stress such that the intermediate portion hangs down due to their own weight, the durability of the heat transfer tubes 30 can be improved, and constituent members such as suspenders are not required. The structure can be simplified.

In the boiler of the present embodiment, the support table 42 is a refractory material filled in the space between the bottom portion 11b of the combustion container 11 and the heat transfer tubes 30. Therefore, the combustion gas G is suppressed from bypassing to the gas outlet 22 side through the space between the bottom portion 11b of the combustion container 11 and the plurality of heat transfer tubes 30, and the combustion gas G is prevented from passing through the plurality of evaporation tubes 25 and the plurality of evaporation tubes 25. The heat exchange performance can be improved by contacting the heat transfer tube 30 and efficiently exchanging heat.

In the boiler of this embodiment, a part of the plurality of heat transfer tubes 30 penetrates the refractory material as the support table 42. Therefore, the space between the bottom portion 11b of the combustion container 11 and the plurality of heat transfer tubes 30 can be properly closed by the refractory material serving as the support table 42, and at the same time, the refractory material partially supports the heat transfer tubes 30 to overheat. The rigidity of the container 14 can be ensured.

In the boiler of the present embodiment, one end in the longitudinal direction of the plurality of heat transfer tubes 30 is connected to the inlet header 31, the other end is connected to the outlet header 32, and the support member 41 is provided between the inlet header 31 and the outlet header 32. Supports a plurality of heat transfer tubes 30 at one or more locations in the longitudinal direction. Therefore, it is possible to efficiently suppress the sagging of each heat transfer tube 30 due to its own weight and suppress the occurrence of bending stress.

In the boiler of the present embodiment, each support member 41 is arranged between the plurality of heat transfer tubes 30. Therefore, the weight of the plurality of heat transfer tubes 30 can be efficiently received and supported, and the size of the support member 41 can be reduced.

In the boiler of the present embodiment, the support member 41 is fixed to one of the heat transfer tubes 30 that are vertically opposed to each other in the fuel gas ejection direction of the burner 12 and is in contact with the other. Therefore, when the heat transfer tube 30 is thermally expanded and deformed, the support member 41 follows the fixed heat transfer tube 30 even if the thermal expansion amount and the thermal deformation amount of the upper and lower heat transfer tubes 30 are different. Bending stress does not act on the heat transfer tube 30, and the durability can be improved.

In the boiler of the present embodiment, the support member 51 is provided with the opening 52 that connects the upstream side and the downstream side in the gas flow direction of the superheater 14. Therefore, the combustion gas G flows through the opening 52, the region of the heat transfer tube 30 where the combustion gas G does not contact is minimized, and the heat transfer tube 30 is uniformly heated, thereby suppressing the generation of thermal stress. It is possible to improve the durability.

10 Boiler 11 Combustion Container 11a Ceiling 11b Bottom 11c Front Wall 11d Rear Wall 11e, 11f Side Wall 12 Burner 13 Evaporator 14 Superheater 21 Air Inlet 22 Gas Outlet 24 Combustion Chamber 25 Evaporating Pipe 26 Water Drum 27 Steam Drum 28 Front bank tube 29 Arrangement space portion 30 Heat transfer tube 31 Inlet header 32 Outlet header 33 Exhaust chamber 41, 51 Support member 42 Support base 52 Opening portion

Claims (6)

A combustion vessel provided with a gas outlet,
A burner provided at a position separated from the gas outlet in the combustion container to burn fuel,
A superheater having a plurality of heat transfer tubes arranged between the burner and the gas outlet and parallel to the installation surface of the combustion container,
A support member that supports a part of the plurality of heat transfer tubes in the longitudinal direction,
A support base provided in the lower portion of the combustion container to support the support member,
Bei to give a,
The plurality of heat transfer tubes are arranged at a predetermined interval in the fuel gas ejection direction of the burner, and the support member is arranged between the plurality of heat transfer tubes.
Boiler characterized by that. The boiler according to claim 1, wherein the support base is a refractory material filled in a space formed between the bottom of the combustion container and the plurality of heat transfer tubes. The boiler according to claim 2, wherein a part of the plurality of heat transfer tubes penetrates through the refractory material. One end of each of the plurality of heat transfer tubes is connected to the inlet header, and the other end of the plurality of heat transfer tubes is connected to the outlet header, and the support member is disposed between the inlet header and the outlet header in the longitudinal direction of the plurality of heat transfer tubes. The boiler according to any one of claims 1 to 3, wherein the boiler supports a place or a plurality of places. The boiler according to any one of claims 1 to 4, wherein the support member is fixed to one of the heat transfer tubes facing the fuel gas ejection direction of the burner and abuts on the other. .. The said support member is provided with the opening part which connects the upstream and downstream of the gas flow direction in the said superheater, The boiler as described in any one of Claim 1 to 5 characterized by the above-mentioned.

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