JP6746489B2 - boiler - Google Patents

Description

The present invention relates to a boiler.

As a type of boiler, a type called a double-blown water pipe type is conventionally known (see, for example, Patent Document 1 below). This type of boiler includes a water drum, a steam drum arranged above the water drum, a group of heat transfer tubes connecting the water drum and the steam drum, and a furnace for heating water in the water drum. The furnace is generally provided at a position adjacent to the water drum and the steam drum in the horizontal direction.

JP 2002-235901 A

However, since the furnace is provided at a position adjacent to the water drum and the steam drum in the horizontal direction as described above, this type of boiler tends to have a large installation area (footprint). Therefore, if there is a space limitation, such as inside a ship, it becomes difficult to install this type of boiler. Further, the gas generated in the furnace in which the burner is installed passes through the heat exchanger to heat the heat medium. Therefore, a heat transfer tube may be arranged on the outer wall of the furnace, but there is a limit to the transfer of heat generated in the furnace, and there is a limit to the improvement of fuel utilization efficiency.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a boiler that can save the installation space and increase the fuel utilization efficiency.

The boiler of the present invention has a first water chamber for storing water supply, a combustion chamber formed in the first water chamber for generating combustion gas to heat the water supply, and a space vertically above the combustion chamber. And a plurality of heat transfer pipes that are provided in the space and that connect the first water chamber and the second water chamber, and the plurality of heat transfer pipes are annular when viewed from the vertical direction. By being arranged in, the heat transfer tubes are arranged, the heat transfer tubes that form a non-arranged area in which the heat transfer tubes are not arranged, the combustion chamber and the space are connected, A flue portion whose end on the space side is open to the non-arranged region, a casing that covers the first water chamber, the second water chamber, the heat transfer tube group, and the flue portion from the outside, and the space. Is arranged in the non-arrangement region, one end of the tubular shape is connected to the first water chamber, the other end is a tubular shape connected to the second water chamber, the circumferential direction of the tubular shape And a partition part having an opening formed in a part of the.

According to this structure, the flow of the combustion gas can be guided more efficiently by the partition section. In addition, since the partition portion is partially open in the circumferential direction, the combustion gas guided toward the heat transfer tubes in the arrangement region through the opening has a flow field having a horizontal component in the arrangement region. Form. As a result, the flow velocity of the combustion gas can be increased, so that the combustion gas can be sufficiently distributed within the arrangement region. Further, since the combustion chamber is formed in the first water chamber, it is possible to reduce the projected area of the boiler when viewed from above. That is, the installation area of the boiler can be reduced. Further, compared with the configuration in which the first water chamber and the combustion chamber are separated from each other, the feed water can be heated more efficiently. Since the feed water can be efficiently heated by the heat of combustion, it is possible to increase the fuel utilization efficiency, that is, the fuel consumption. Further, the heat transfer tube group is arranged in an annular shape when viewed from the vertical direction, and one end of the flue portion is open in the non-arranged region. Thereby, the combustion gas can be smoothly guided toward the heat transfer tube in the arrangement area through the non-arrangement area.

In the boiler of the present invention, the partition section is connected between the heat transfer tubes facing the non-arranged region among the plurality of heat transfer tubes and the plurality of heat transfer tubes, and between the heat transfer tubes. It may include a fin to be connected.

According to this configuration, since the heat transfer tubes and the fins extending between the heat transfer tubes form the partition sections, it is not necessary to separately provide another member as the partition section. Further, the heat quantity of the combustion gas passing through the inner peripheral side of the partition section can be efficiently recovered by the heat transfer tube having the fins.

In the boiler of the present invention, the casing may have an exhaust port formed at a position opposite to the opening of the partition in the circumferential direction.

According to this configuration, the path length through which the combustion gas flows can be relatively lengthened. As a result, the combustion gas that has flowed into the arrangement region from the opening of the partition can contact more heat transfer tubes while flowing in the horizontal direction. Thereby, the efficiency of heat exchange can be improved.

The boiler of the present invention has a second partition part that is connected to the inner surface of the casing and the circumferential edge of the opening in the partition part, and connects the inner surface of the casing and the partition part. May be.

According to this structure, a part of the arrangement region can be divided in the circumferential direction by the second partition portion. As a result, a circumferential component can be added to the flow velocity of the combustion gas in the arrangement area. As a result, the flow velocity of the combustion gas can be further increased, so that the combustion gas can be more sufficiently distributed in the arrangement area.

In the boiler of the present invention, the second partitioning section may include a plurality of the heat transfer tubes and fins that are connected between the plurality of heat transfer tubes and close the spaces between the heat transfer tubes.

According to this configuration, since the plurality of heat transfer tubes and the fins extending between the heat transfer tubes form the second partition section, it is not necessary to separately provide another member as the second partition section. Furthermore, the heat of the combustion gas in contact with the second partition can be efficiently recovered by the heat transfer tube having the fins.

In the boiler of the present invention, the position of the center of gravity of the non-arranged region may match the position of the center of gravity of the heat transfer tube group as seen from the up and down direction.

According to this structure, the combustion gas that has flowed into the arrangement region from the opening of the partition section flows horizontally along the inner surface of the casing and then is discharged to the outside through the exhaust port. As a result, the flow velocity of the combustion gas can be increased, so that the combustion gas can be sufficiently distributed within the arrangement region.

According to the present invention, it is possible to save the installation space and provide a boiler with high fuel utilization efficiency.

FIG. 1 is a cross-sectional view showing the configuration of the boiler according to this embodiment. FIG. 2 is a cross-sectional view showing the configuration of the heat transfer tube group according to this embodiment. FIG. 3 is an enlarged view showing the configuration of the partition section according to the present embodiment. FIG. 4 is a cross-sectional view showing a configuration of a heat transfer tube group according to another embodiment.

Hereinafter, preferred embodiments of 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.

FIG. 1 is a cross-sectional view showing the configuration of the boiler according to this embodiment. It is sectional drawing which shows the structure of the heat transfer tube group which concerns on this embodiment. It is an enlarged view showing the composition of the partitioning part concerning this embodiment.
As shown in FIG. 1, a boiler 1 includes a base 2, a head 3 arranged vertically above the base 2, a heat transfer tube group 4 provided in a space between the base 2 and the head 3, and a base. 2, a casing 5, which covers the head 3 and the heat transfer tube group 4 from the outside, and a partition 8. In the present embodiment, the boiler 1 will be described as a case where the installation surface is a horizontal plane and the boiler 1 is arranged in a direction extending in a vertical direction orthogonal to the horizontal plane. However, the boiler 1 is inclined with respect to the horizontal. You may install on the surface. Further, the boiler 1 may be arranged in a direction inclined with respect to the direction orthogonal to the installation surface. In the boiler 1, the head 3 is arranged above the base 2 in the vertical direction even when the boiler 1 is inclined with respect to the vertical direction.

The base portion 2 has a water storage portion 21 and a burner 22. The water storage unit 21 is a container that stores water (water supply) supplied from an external water supply source. Specifically, the water storage part 21 has a bottom part 23 located on the lower side, a cylindrical water storage part wall 24 extending upward from the bottom part 23, a first tube sheet 25 vertically opposed to the bottom part 23, Have. The water storage part wall 24 and the bottom part 23 are a part of the casing 5 described later. The bottom portion 23 and the first tube sheet 25 are circular when viewed from the vertical direction. The first tube sheet 25 is formed with a plurality of holes into which the heat transfer tube group 4 described later is inserted. The space surrounded by the bottom portion 23, the water storage portion wall 24, and the first tube sheet 25 is the first water chamber R1.

The burner 22 burns fuel and produces combustion gas. The burner 22 has a burner body 221 that burns fuel supplied from the outside to generate high-temperature combustion gas, and a combustion pipe 222 through which the combustion gas flows. The internal space of the combustion pipe 222 becomes the combustion chamber 223.

The burner main body 221 is inserted into the water reservoir wall 24 and is partially exposed to the combustion pipe 222. The burner body 221 is arranged so as to inject the flame into the combustion chamber 223 in a substantially horizontal direction. The combustion pipe 222 is a cylinder that extends horizontally from the burner body 221 into the first water chamber R1. That is, the combustion pipe 222 is arranged so as to enter the first water chamber R1 from the water storage wall 24. In other words, the combustion chamber 223 is formed inside the first water chamber R1. Furthermore, the combustion pipe 222 according to the present embodiment has only one flue portion 6. The flue portion 6 extends vertically upward from the upper portion of the combustion pipe 222. One end of the flue portion 6 opens at a position eccentric in the horizontal direction from the center position of the circular first tube sheet 25. The combustion gas in the combustion chamber 223 is guided into the heat exchange space T described later through the flue portion 6.

The head 3 is arranged above the base 2 via the heat transfer tube group 4. Specifically, the head 3 includes a second tube sheet 31 located on the lower side, a cylindrical head wall 32 extending upward from the second tube sheet 31, and a second tube sheet 31 in the vertical direction. The ceiling part 33 which opposes. The head wall 32 and the ceiling 33 are a part of the casing 5. The ceiling portion 33 and the second tube sheet 31 are circular when viewed from the vertical direction. The second tube sheet 31 is formed with a plurality of holes into which the heat transfer tube group 4 described later is inserted. The space surrounded by the second tube sheet 31, the head wall 32, and the ceiling portion 33 is the second water chamber R2 in which the steam generated through the base portion 2 and the heat transfer tube group 4 flows. Furthermore, the head 3 has an outlet 7 for guiding steam to the outside. The outlet 7 is provided above the ceiling portion 33.

The heat transfer tube group 4 is provided for exchanging heat between the heat medium heated in the first water chamber R1 and the combustion gas generated in the combustion chamber 223. Specifically, the heat transfer tube group 4 has a plurality of heat transfer tubes 41 extending in the vertical direction and arranged at intervals in the horizontal direction. Each heat transfer tube 41 is inserted through the holes formed in the first tube sheet 25 and the second tube sheet 31 described above. As shown in FIG. 2, the heat transfer tube group 4 is arranged in an annular shape as a whole when viewed from the vertical direction. In other words, the heat transfer tube group 4 has an outer peripheral side edge and an inner peripheral side edge when viewed from the vertical direction. The outer peripheral edge and the inner peripheral edge of the heat transfer tube group 4 are circular. The heat transfer tube group 4 forms an arrangement area S1 in which the heat transfer tubes 41 are arranged and a non-arrangement area S2 in which the heat transfer tubes 41 are not arranged.

Of the heat transfer tubes 41 in the arrangement area S1, the heat transfer tubes 41 located on the outermost peripheral side are circular with a circumferential interval along the outer peripheral shape of the first tube sheet 25 (or the second tube sheet 31). It is arranged. The heat transfer tubes 41 located on the inner circumference side of the heat transfer tubes 41 located on the outermost circumference side are arranged in a grid pattern.

The non-arranged region S2 is a region surrounded by the inner peripheral edge of the heat transfer tube group 4. The non-arranged region S2 is circular when viewed from the vertical direction. One end of the flue portion 6 is open in a region including the center of the non-arranged region S2. As shown in FIG. 2, in the present embodiment, the center position P1 (or the geometrical center of gravity position) of the non-arrangement region S2 matches the center position P2 of the arrangement region S1. That is, the inner peripheral edge and the outer peripheral edge of the heat transfer tube group 4 are concentric.

The partition portion 8 has a cylindrical shape and is arranged on the outer peripheral side of the non-arrangement region S2. The partition 8 has one end connected to the first water chamber R1 and the other end connected to the second water chamber R2. The partition 8 has an arcuate cross section when viewed from the vertical direction. That is, the partition portion 8 has the opening portion 81 that is opened in the radial direction by cutting out a part in the circumferential direction. The opening 81 is provided on the side opposite to the exhaust port 43 formed in the side wall 42 when viewed in the vertical direction. In other words, the opening 81 faces the inner surface of the side wall 42.

The partition section 8 according to the present embodiment is formed by providing the fins 44 on the plurality of heat transfer tubes 41 facing the non-arrangement region S2. That is, the partition portion 8 includes a plurality of heat transfer tubes 41 facing the non-arranged region S2, and fins 44 that close between the plurality of heat transfer tubes 41. More specifically, as shown in FIG. 3, a part of the heat transfer tube 41 facing the non-arrangement area S2 (that is, a part of the heat transfer tube 41 located on the innermost side in the arrangement area S1) is an outer peripheral surface. It has a pair of fins 44 extending upward in the direction away from each other. Of the pair of heat transfer tubes 41 adjacent to each other, the fins 44 of the heat transfer tube 41 on the one side in the circumferential direction are in contact with the fins 44 of the heat transfer tube 41 on the other side in the circumferential direction. In consideration of heat expansion during operation, a slight gap may be provided between the adjacent fins 44 when the boiler 1 is constructed. By thus connecting the plurality of heat transfer tubes 41 having the fins 44 to each other, the partition portion 8 can be formed.

As shown in FIG. 1, the heat transfer tube group 4 is covered with a side wall 42 from the outer peripheral side. The side wall 42 is a part of the casing 5. The heat exchange space T is a space where the above-mentioned heat exchange is performed, and is covered with the side wall 42, the first tube sheet 25, and the second tube sheet 31. The side wall 42 has an arcuate cross section when viewed in the vertical direction. A portion of the side wall 42, which is cut out in an arc shape, serves as an exhaust port 43 that communicates the inside and outside of the heat exchange. Specifically, the side wall 42 has a cylindrical shape except for the exhaust port 43, and the exhaust port 43 is a part of the cylindrical shape which is cut out in the circumferential direction. The exhaust port 43 is formed on the side wall 42 on the side opposite to the direction in which the opening 81 of the partition 8 is formed. That is, when viewed in the vertical direction, the distance from the exhaust port 43 to the non-disposition region S2 is set to be larger than the distance from the non-disposition region S2 to the inner surface of the sidewall 42 closest to the non-disposition region S2.

The exhaust port 43 is connected to a duct 50 for guiding the combustion gas to an exhaust gas treatment device or the like. Combustion gas (exhaust gas) flows into the duct 50 from the exhaust port 43, is sent to the exhaust gas treatment device and the like through the duct 50, and is subjected to measures such as desulfurization and denitration by the exhaust gas treatment device and then released into the atmosphere. To be done. The boiler 1 may not include the exhaust gas treatment device.

The casing 5 is integrally formed by the bottom portion 23, the water storage portion wall 24, the side wall 42, the head portion wall 32, and the ceiling portion 33 described above. That is, the casing 5 covers the first water chamber R1, the second water chamber R2, the heat transfer tube group 4, and the flue portion 6 from the outside.

The operation of the boiler 1 according to this embodiment will be described below. First, the boiler 1 supplies fuel to the burner 22 and ignites it. As a result, high temperature combustion gas is generated in the combustion chamber 223. The heat of the combustion gas propagates to the water supply in the first water chamber R1 via the combustion pipe 222. As a result, the temperature of the water supply rises. Since the heated water supply becomes relatively light, it moves vertically upward, flows into the heat transfer tube 41 in the heat exchange space T, and goes to the second water chamber R2. On the other hand, the combustion gas generated in the combustion chamber 223 flows into the heat exchange space T through the flue portion 6. More specifically, the combustion gas flows through the gap formed between the heat transfer tubes 41. As a result, in the heat exchange space T, heat exchange is performed between the feed water flowing in the heat transfer tube 41 and the combustion gas. As a result, the temperature of the feed water rises as it rises in the heat transfer tube 41. The water supply flows from the heat transfer pipe 41 into the second water chamber R2. Part of the water supplied to the second water chamber R2 becomes steam and is taken out through the outlet 7.

Next, the behavior of the combustion gas in the heat exchange space T will be described with reference to FIG. The combustion gas that has passed through the flue section 6 flows into the heat exchange space T through the opening 81 of the partition section 8. The combustion gas flowing into the heat exchange space T flows toward the inner surface of the side wall 42 that faces the opening 81 in the horizontal direction. The flow of the combustion gas that has collided with the inner surface of the side wall 42 is divided into two in the circumferential direction along the inner surface. Specifically, the flow of the combustion gas is divided into a flow directed to one side in the circumferential direction and a flow directed to the other side in the circumferential direction. The two separated combustion gas flows flow along the inner surface of the side wall 42 and then toward the exhaust port 43. That is, the combustion gas forms a flow field having a horizontal component in the arrangement area S1. The combustion gas, in a high temperature state, passes around the heat transfer tube 41 near the non-arrangement region S2. After that, the combustion gas flows around the heat transfer tube 41 far from the non-arranged region S2 while the temperature is lowered by heat exchange. Through such behavior, the combustion gas exchanges heat with the feed water in the heat transfer tube 41, and then is discharged to the outside through the exhaust port 43.

The boiler 1 according to the present embodiment can more efficiently guide the combustion gas to the region where the heat transfer tubes 41 are arranged by the partition section 8. In addition, a part of the partition 8 in the circumferential direction is open. The combustion gas guided toward the heat transfer tube 41 in the arrangement area S1 through the opening 81 forms a flow field having a horizontal component in the arrangement area S1. As a result, the flow velocity of the combustion gas can be increased as compared with the case where the partition 8 is not formed. Therefore, the combustion gas can be sufficiently spread in the arrangement area S1, and the efficiency of the boiler 1 can be further improved.

According to the above configuration, the position of the center of gravity of the non-arranged region S2 coincides with the position of the center of gravity of the heat transfer tube group 4 as seen from above and below. Therefore, the combustion gas flowing from the opening of the partition 8 into the arrangement region S1 forms a flow field that spreads horizontally along the inner surface of the casing 5. Therefore, since the flow velocity of the combustion gas can be increased, the combustion gas can be sufficiently distributed in the arrangement area S1.

Furthermore, according to the above-described configuration, the fins 44 extending between the heat transfer tubes 41 form the partition portion 8, so that it is not necessary to separately provide another member as the partition portion 8. Further, the heat quantity of the combustion gas passing through the inner peripheral side of the partition section 8 can be efficiently recovered by the heat transfer tube 41 having the fins 44.

In addition, according to the above configuration, the casing 5 has the exhaust port 43 formed at a position opposite to the opening 81 of the partition 8. As a result, the path length through which the combustion gas flows can be made relatively long. As a result, the combustion gas flowing from the opening 81 of the partition 8 into the arrangement region S1 can contact more heat transfer tubes 41 while flowing horizontally along the inner surface of the casing 5. Thereby, the efficiency of the boiler 1 can be improved.

Further, in the boiler 1, the heat transfer tube group 4 is arranged in an annular shape when viewed from the vertical direction, so that an arrangement area S1 in which the heat transfer tubes 41 are arranged and a non-arrangement area S2 in which the heat transfer tubes 41 are not arranged are provided. And one end of the flue portion 6 opens toward the non-arrangement region S2. According to this configuration, the combustion gas can be smoothly guided toward the heat transfer pipe 41 in the arrangement region S1 through the non-arrangement region S2.

Further, the boiler 1 can be used particularly preferably for supplying auxiliary steam in a ship. Here, in the case of installing this type of device inside the ship, the installation space becomes large if a conventional twin-boiler-tube boiler or the like is installed. On the other hand, in the boiler 1, since the combustion chamber 223 is formed in the first water chamber R1, the projected area of the boiler 1 when viewed from above can be reduced. That is, the installation area of the boiler 1 can be reduced. Therefore, the space inside the ship can be effectively utilized. Further, since the combustion chamber 223 is formed in the first water chamber R1, heat can be efficiently transferred compared to the configuration in which the first water chamber R1 and the combustion chamber 223 are separated from each other. .. Therefore, the heat exchange efficiency can be improved. As a result, the fuel utilization efficiency can be increased and the fuel consumption can be increased.

The boiler 1 can be modified in various ways without departing from the scope of the present invention. For example, in the present embodiment, the configuration in which only one non-arrangement region S2 and one flue portion 6 are provided has been described. However, the number of the non-arrangement regions S2 and the flue parts 6 is not limited to one, and it is also possible to provide two non-arrangement regions S2 and the flue parts 6. With such a configuration, the combustion gas can be spread over a wider area through the two flue portions 6 as compared with the case where only one flue portion 6 is provided. In other words, more heat transfer tubes 41 can contribute to heat exchange. As a result, the efficiency of the boiler 1 can be further improved. Further, in the present embodiment, the center position P1 of the non-arrangement region S2 is set to the position that coincides with the center position P2 of the arrangement region S1. The position may be deviated from the position.

In the boiler 1, the example in which the partition 8 is formed by the heat transfer tube 41 and the fins 44 provided on the heat transfer tube 41 has been described. However, the configuration of the partition section 8 is not limited to this, and it is possible to use, for example, another member different from the heat transfer tube 41 as the partition section 8.

Hereinafter, another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view showing a configuration of a heat transfer tube group according to another embodiment. In the boiler 1A shown in FIG. 4, in addition to the partition part 8A, a second partition part 9 is provided in the arrangement area S1. Further, in this embodiment, the end edge L1 on one side in the circumferential direction of the exhaust port 43 and the end edge L2 on the other side in the circumferential direction of the opening 81 of the partition portion 8A are aligned with each other in the circumferential direction. The second partition 9 connects the end L1 of the exhaust port 43 on one side in the circumferential direction and the end L2 of the opening 81 on the other side in the circumferential direction. That is, the second partition portion 9 extends in the radial direction of the arrangement area S1. The second partition 9 is formed by the heat transfer tubes 41 adjacent to each other and the fins 44 closing the space between the heat transfer tubes 41, similarly to the partition 8. More specifically, the second partition 9 is formed by providing the fins 44 in one row of the heat transfer tubes 41 arranged in a grid.

According to such a configuration, the second partition portion 9 can divide a part of the arrangement area S1 in the circumferential direction. Thereby, the circumferential component can be added to the flow velocity of the combustion gas in the arrangement area S1. Specifically, as shown in FIG. 4, the combustion gas flowing from the opening 81 of the partition 8A into the arrangement region S1 is guided by the inner surfaces of the second partition 9 and the side wall 42 and is guided from the other side in the circumferential direction to the one side. Flows in one direction towards. As a result, the flow velocity of the combustion gas can be increased as compared with the case where the flow of the combustion gas is diffused in a plurality of directions. Therefore, the combustion gas can be more sufficiently distributed in the arrangement area S1. Thereby, the efficiency of the boiler 1 can be improved.

Furthermore, according to the above configuration, the fins 44 extending between the heat transfer tubes 41 form the second partition 9, so that it is not necessary to separately provide another member as the second partition 9. Therefore, the heat quantity of the combustion gas in contact with the second partition 9 can be efficiently recovered by the heat transfer tube 41 having the fins 44.

Various modifications can be made to the above-described configuration without departing from the scope of the present invention. For example, in the boiler 1A illustrated in FIG. 4, the example in which the second partition 9 is formed by the heat transfer tube 41 and the fins 44 provided on the heat transfer tube 41 has been described. However, the configuration of the second partition 9 is not limited to this, and for example, another plate-shaped member different from the heat transfer tube 41 can be used as the second partition 9.

Further, in the present embodiment, an example in which the heat transfer tube group 4 is arranged in an annular shape has been described. However, the configuration of the heat transfer tube group 4 is not limited to this, and may be arranged in, for example, a square ring shape.

1 Boiler 2 Base 3 Head 4 Heat Transfer Tube Group 5 Casing 6, 6b Flue 7 Outlet 8 Partition 9 Second Partition 21 Water Storage 22 Burner 23 Bottom 24 Water Storage Wall 25 First Tube Sheet 31 Second Tube Sheet 32 head wall 33 ceiling part 41 heat transfer pipe 42 side wall 43 exhaust port 44 fin 50 duct 81 opening 221 burner body 222 combustion pipe 223 combustion chamber R1 first water chamber R2 second water chamber S1 arrangement region S2, S2b non-arrangement region T heat exchange space

Claims (6)

A first water chamber that stores the water supply,
A combustion chamber formed in the first water chamber to generate combustion gas to heat the feed water,
A second water chamber arranged with a space vertically above the combustion chamber,
The heat transfer tube is provided in the space, has a plurality of heat transfer tubes that connect the first water chamber and the second water chamber, and the plurality of heat transfer tubes are arranged in an annular shape when viewed from the vertical direction. And a heat transfer tube group forming an arrangement area where the heat transfer tubes are arranged and a non-arrangement area where the heat transfer tubes are not arranged,
A flue portion that connects the combustion chamber and the space, and an end portion on the space side that opens to the non-arrangement region,
A casing that covers the first water chamber, the second water chamber, the heat transfer tube group, and the flue portion from the outside,
Arranged in the non-arranged region of the space, one end of the tubular shape is connected to the first water chamber, the other end is a tubular shape connected to the second water chamber, the tubular shape A partition part having an opening formed in a part in the circumferential direction,
The non-arrangement region is surrounded by the inner peripheral edge of the annular arrangement region when viewed from the vertical direction,
In the partition section, the opening connects the non-arrangement area and the arrangement area,
A boiler in which the combustion gas passes through the opening from the non-arranged region and passes through a space between the partition section and the casing . The partition section includes, among the plurality of heat transfer tubes, the heat transfer tubes facing the non-arranged region, and fins connected between the plurality of heat transfer tubes and connecting the heat transfer tubes. The boiler of claim 1 including. The boiler according to claim 1, wherein the casing has an exhaust port formed at a position opposite to the opening of the partition section in the circumferential direction. 4. The second partition part, which is connected to an inner surface of the casing and a circumferential edge of the opening in the partition part, and has a second partition part that connects the inner surface of the casing and the partition part. Boiler according to item 1. The boiler according to claim 4, wherein the second partition portion includes a plurality of the heat transfer tubes and fins that are connected between the plurality of heat transfer tubes and close the spaces between the heat transfer tubes. The boiler according to any one of claims 1 to 5, wherein a center of gravity of the non-arranged region coincides with a center of gravity of the heat transfer tube group as viewed from above and below.

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