JPH06307602A - Boiler - Google Patents

Abstract

PURPOSE:To provide a boiler, capable of contriving the enlargement of combustion gas-passing area and necessitating no special supporter for supporting a heated device, by a method wherein the supporting of the heated device, such as a reheater, a heater and the like is effected without generating any deflaction. CONSTITUTION:One every several pieces of furnace wall tubes, constituting the fore wall 4a of rear heat transfer unit 4 of a boiler, is projected toward the rear wall 4b of the rear heat transfer unit 4 to use the same as a supporting tube 41 while the supporting tube 41 is inserted and positioned into a heated device 6, formed of a plurality of parallel heat transfer tubes 7 meandering in up-and-down direction. One side of bent end of the heat transfer tube 7 (bent end of fore wall 4a side of rear heat transfer unit 4) is supported by a supporting tube 41 while the other end of the bent end of the heat transfer tube 7 is supported by the furnace tube of the rear wall 4b of the rear heat transfer unit 4 respectively. Accordingly, the heat transfer tube 7 can be supported so as not to generate any deflection in the horizontal parts of the heat transfer tube 7, the enlargement of the passing area of combustion gas 3 can be contrived naturally and any individual instrument is not necessitated to be installed accompanied by the enlargement of the passing area of the combustion gas 3 whereby it is economical.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports a heated object such as a reheater or a superheater which is heated or overheated by combustion gas generated by combustion in a furnace without causing any bending, and the passing area of the combustion gas. The present invention relates to a boiler that can be expanded without difficulty and that can be manufactured at low cost without the need to install a special means for supporting the heated object.

[0002]

2. Description of the Related Art Generally, a boiler as shown in FIG. 8 is used.

In the figure, 1 is a furnace, 2 is a burner provided in the furnace 1, 3 is a combustion gas generated when fuel is burned by the burner 2, and 4 is connected to the furnace 1 via a side wall 5. The rear heat transfer section (heat transfer section) 6 is a device to be heated such as a reheater, a superheater and a economizer installed in the rear heat transfer section 4,
A plurality of heat transfer tubes 7 formed in a continuous U-shape on a vertical plane so as to alternately turn in the front-rear direction A of the rear heat transfer section 4 (directions of the front wall 4a and the rear wall 4b) and meander vertically. The heat transfer parts 4 are arranged in the width direction (a direction perpendicular to the paper surface), and 8 is an exhaust gas duct for discharging the combustion gas 3 heated by the water and steam of the heated device 6 as exhaust gas 9. 1
0 is control.

The fuel blown into the lower part of the furnace 1 is burned by the burner 2, and the produced combustion gas 3 rises from the lower part to the upper part of the furnace 1 and during this ascent, the furnace wall and the inside of the furnace 1 are not shown. The device to be heated is heated and sent to the rear heat transfer part 4 through the sub-side wall 5, and at the rear heat transfer part 4, the heat transfer tube 7 of the device to be heated 6 is heated.
The water and steam flowing therein are heated or overheated and then discharged as exhaust gas 9 from the exhaust gas duct 8.

In the boiler described above, the furnace wall of the furnace 1, the side wall 5 and the rear heat transfer section 4 is formed of a panel in which adjacent furnace wall tubes are connected to each other by fins,
The bent ends on the front and rear ends of each heat transfer tube 7 forming the heated unit 6 have the front wall 4 of the rear heat transfer unit 4 formed as described above.
It is supported by a and the rear wall 4b as shown in FIG.

That is, as shown in FIG. 9, the side of each furnace wall tube 11 forming the rear wall 4b of the rear heat transfer section 4 connected to each other by the fins 12 facing the heat transfer tube 7 is viewed from above as shown in FIG. The base of a holding metal fitting 13 having a shape in which the tip is bent at a right angle is attached, and a groove 15 is provided in the width direction of the rear heat transfer portion 4 at the upper end of the tip bending portion 14 of the holding metal fitting 13. At the same time, the locking tool 16 is provided at the bent end of the heat transfer tube 7 that forms the device to be heated 6, which is located at the rear wall 4b side of the rear heat transfer section 4 and at an arbitrary position (located at the lowermost side). It is attached so as to be positioned above the tip bending portion 14 of the holding metal fitting 13, and at the central portion of the lower end surface of the locking tool 16,
An engagement recess 17 that engages with the groove 15 of the tip bending portion 14 of the holding metal fitting 13 is provided in a cross shape when viewed from above, and the heat transfer tube 7 forms the rear wall 4b of the rear heat transfer portion 4. It is adapted to be supported by the furnace wall tube 11 in a state in which the rear heat transfer section 4 is allowed to move in the front-rear direction A and the width direction. Further, in the same manner, the heat transfer tube 7 that forms the heated device 6,
An arbitrary bent end of the rear heat transfer section 4 on the front wall 4a side is also supported by the furnace wall tube 11 forming the front wall 4a of the rear heat transfer section 4.

In addition to the above-mentioned method for supporting the heated device 6, a support pipe 18 separately provided in the rear heat transfer portion 4 as shown in FIGS. 10 and 11 is used to increase the passage area of the combustion gas 3. Supporting the heated device 6 is also performed. That is,
Every two of the heat transfer tubes 7 forming the device to be heated 6,
Moreover, the support pipes 18 are erected so as to be located inside the bent ends of the heat transfer pipes 7 on the front and rear sides, and the support pipes 18 are provided on both sides of the support pipes 18 facing the heat transfer pipes 7. As shown in FIGS. 12 and 13, a receiving fitting 19 for receiving the heat transfer tube 7 from the lower side is provided in the width direction of the rear heat transfer section 4, and the upper end surface of the receiving fitting 19 has a heat transfer tube 7 thereon. An arcuate recess 20 for receiving the lower portion is provided, and the heat transfer tube 7 is received in the recess 20 and can be supported from below. It should be noted that the upper and lower ends of each of the support tubes 18 are connected to a tube shifter 21.

Further, in addition to the boiler shown and described in FIG. 8, a boiler as shown in FIG. 14 is used. That is, the rear heat transfer section 4 is formed by a partition wall 22 formed by a panel in which adjacent partition tubes are connected to each other by fins in the same manner as the furnace wall of the rear heat transfer section 4 is used. Direction A
And the superheater flow path 23 and the reheater flow path 24 are formed in the vertical direction by this partition, and the superheater 25, 26 is provided in the superheater flow path 23 and the reheater flow path 24 is provided in the reheater flow path 24. Reheater 2
7, 28 are provided respectively, and dampers 29, 30 are provided on the outlet side of the superheater flow path 23 and the reheater flow path 24, so that the combustion gas 3 reaching the rear heat transfer section 4 is a partition wall. 22 is branched in the vertical direction by the superheater passage 23 and the reheater passage 2
4 to heat or superheat the boiler water and steam flowing inside the superheaters 25, 26 and the reheaters 27, 28, and then pass through the dampers 29, 30 to exhaust gas 9 from the exhaust gas duct 8.
Boilers that are designed to be discharged as are used.
The same components as those shown in FIG. 8 are designated by the same reference numerals.

The superheaters 25 and 26 and the reheater 27,
Numeral 28 is formed in a continuous U-shape on the vertical surface so as to alternately turn in the front-rear direction A of the rear heat transfer portion 4 and meander in the up-down direction, similar to the boiler to-be-heated 6 shown in FIG. The heat transfer tubes 31 and the heat transfer tubes 32 are arranged in the width direction of the plurality of rear heat transfer parts 4, and the partition tube forming the partition wall 22 is located in the header 33, and the heat transfer tubes 31 and 32 are The headers 34 and 35 are respectively connected.

In the boiler shown in FIG. 14, the superheaters 25 and 26 and the reheaters 27 and 28 are supported as shown in FIG. 9 in the same manner as the heated device 6 of the boiler shown in FIG. There is.

[0011]

However, in the boiler which supports the heated device 6 as shown in FIGS. 8 and 9, in order to increase the amount of heat exchange in the heated device 6. When the dimension between the front wall 4a and the rear wall 4b of the rear heat transfer section 4 is increased to increase the passage area of the combustion gas 3,
The horizontal portion of the heat transfer tube 7 forming the heated device 6 is bent,
Due to this bending, the flow of fluid in the heat transfer tube 7 is hindered, which is not preferable.

Further, as shown in FIGS. 10 to 13, in the boiler which supports the heated device 6, the heated device 6 is used.
Although it is possible to deal with the bending of the horizontal portion of the heat transfer tube 7 constituting the above, it is necessary to separately install a large number of support tubes 18 in the rear heat transfer section 4 inside the rear heat transfer section 4, It is uneconomical to install the pipe because it requires much labor and time, resulting in cost increase.

Further, in the boiler shown in FIG.
Since the front and rear ends of the superheaters 25 and 26 and the reheaters 27 and 28 are supported in the same manner as in the boiler shown in Fig. 6, the amount of heat exchange in the superheaters 25 and 26 and the reheaters 27 and 28 is increased. For the purpose of illustration, the size of the rear wall 4b of the rear heat transfer part 4 and the partition wall 22 and the dimension between the partition wall 22 and the front wall 4a of the rear heat transfer part 4 are increased to increase the passage area of the combustion gas 3. When this is performed, the horizontal portions of the heat transfer tubes 31 and 32 forming the superheaters 25 and 26 and the reheaters 27 and 28 are bent, and this bending hinders the flow of fluid in the heat transfer tubes 31 and 32. Is not preferred.

In view of the above situation, the present invention aims to increase the amount of heat exchange in a heated device such as a superheater or a reheater, in order to increase the amount of heat exchange between the front wall and the rear wall (opposing wall) of the heat transfer section. Even if the dimensions are enlarged to increase the passage area of the combustion gas, the horizontal part of the heat transfer tube of the heated device can be prevented from bending, and it is also supported separately to support the heat transfer tube of the heated device. It is an object of the present invention to provide a boiler that can be manufactured at low cost without the need to install a tube inside the heat transfer section.

[0015]

The first aspect of the present invention is to dispose a heated device such as a reheater or a superheater in which a plurality of heat transfer tubes having a meandering shape in the vertical direction are arranged in parallel in a heat transfer section. In the boiler configured as described above, one side of the bent end portion of the heat transfer tube forming the heated object is supported by the furnace wall, and the other side is supported by a supporting tube projecting inward from the furnace wall. It depends on the boiler.

A second aspect of the invention is a reheater in which a plurality of heat transfer tubes having a meandering shape in the vertical direction are formed in parallel in a plurality of combustion gas passages in which a heat transfer section is vertically partitioned by a partition wall. Alternatively, in a boiler in which heated devices such as a superheater are respectively arranged, one side of the bent end of the heat transfer tube forming the heated device is a furnace wall or a partition wall and the other side is a partition wall to the furnace wall. The present invention relates to a boiler characterized in that it is supported by a support tube projecting toward the partition wall or a support tube projecting from the furnace wall toward the partition wall.

[0017]

In the boiler of the first invention in which the partition wall is not provided in the heat transfer section, either the front wall or the rear wall of the heat transfer section constitutes a heated object such as a superheater or a reheater. The bent end of the heat transfer tube is supported by supporting one side of the bent part of the heat transfer tube and the other side of the bent part of the heat transfer tube by a supporting tube protruding inward either of the front wall or the rear wall of the heat transfer section. By supporting the central side of the heat transfer tube, it is possible to prevent the heat transfer tube from bending in the horizontal part, and there is no need to separately install a dedicated support tube in the heat transfer tube to support the heat transfer tube. Target. Further, even in the boiler of the second invention in which the partition wall is provided in the heat transfer section, one of the heat transfer tubes constituting the heated device such as the reheater or the superheater is similar to the boiler of the first invention. By supporting the one side by the furnace wall or the partition wall of the heat transfer section and the other side by the support tube of the partition wall protruding toward the heat transfer section or the support tube of the heat transfer section protruding toward the partition wall, By supporting the center side of the bent end of the heat transfer tube, it is possible to prevent bending in the horizontal part of the heat transfer tube, and additionally, to support the heat transfer tube, a dedicated support tube is installed inside the heat transfer section. Economical with no need.

[0018]

EXAMPLES Examples of the present invention will be described below with reference to FIGS.
Will be described with reference to. The same components as those of the boiler shown in FIG. 8 are designated by the same reference numerals, and the description of the same components will be omitted. The structure unique to the present invention will be described.

The front wall 4a (or the rear wall 4b) of the rear heat transfer section 4
Of the furnace wall tubes 11 forming the, any furnace wall tube 11 is projected toward the inside of the rear heat transfer section 4 to form the support tube 41,
As shown in FIG. 2, a heat transfer tube 7 forming a heated device 6 which is alternately turned in the front-rear direction A and meandered in the vertical direction.
In between, every two of them, the support tubes 41 are vertically inserted. In the case of FIG. 2, every other wall of the furnace wall 11 is projected toward the inner side of the rear heat transfer section 4 to form the support tube 41. However, the rear heat transfer of the heat transfer tube 7 forming the device to be heated 6 The furnace wall tubes 11 may be protruded toward the inside of the rear heat transfer section 4 at intervals of a plurality of tubes (for example, two tubes or three tubes) in accordance with the widthwise pitch of the portions 4 to form the support tubes 41.

As shown in FIG. 12 and FIG. 12, the support tubes 41 projecting toward the inside of the rear heat transfer section 4 as described above are located on both sides of the support tubes 41 located between the heat transfer tubes 7 and facing the heat transfer tubes 7. As shown in 13, a receiving metal fitting 19 with a recess 20 for receiving the heat transfer tube 7 from below is provided in the width direction of the rear heat transfer section 4, and supports the heat transfer tube 7 from below in a state of being housed in the recess 20. It is like this.

Further, as shown in FIG. 9, a groove 15 is formed in the tip bent portion 14 on the side of each furnace wall tube 11 forming the rear wall 4b of the rear heat transfer section 4 facing the heat transfer tube 7 and held. Metal fittings 1
3 is attached to the bent end of the heat transfer tube 7 that forms the heated device 6 and is located at the rear wall 4b side of the rear heat transfer section 4 and at an arbitrary position (for example, located at the lowermost side). , A locking tool 16 having an engaging recess 17 that engages with the groove 15 of the holding fitting 13 from the upper side is provided with a tip bending portion 14 of the holding fitting 13.
Located on the upper side of the groove and seen from above, the groove 15 and the engaging recess 17
Are attached so as to engage in a cross shape, and
The bent end on the rear wall 4b side of the rear heat transfer section 4 of the heat transfer tube 7 forming the heated device 6 is supported by the furnace wall tube 11 through the furnace wall tube 11 via the holding member 6 and the holding metal fitting 13, as shown in FIG. Has become. In the figure, reference numeral 42 is a heading.

Therefore, each heat transfer tube 7 forming the heated device 6
On the front wall 4a side of the rear heat transfer portion 4, a horizontal portion inside from the bent end portion is formed by the support tube 41 protruding inward, and on the rear wall 4b side of the rear heat transfer portion 4, the rear wall 4b is formed. Furnace wall tube 1
Since the bent end portions are supported by 1 so as to be movable in the front-rear direction A and the width direction of the rear heat transfer portion 4, respectively, it is possible to cope with vibration and expansion / contraction occurring in the heat transfer tube 7 of the heated device 6 during boiler operation. In addition, the horizontal portion of the heat transfer tube 7 is less likely to bend, and the expansion of the passage area of the combustion gas 3 is not hindered. Further, a separate support tube for the heat transfer tube 7 is provided at the rear part. It is economical because the mechanism is simple and there is no need to install piping inside the heat transfer section 4.

In FIG. 3, the rear heat transfer section 4 is divided into front and rear partitions 2
2 shows an embodiment of the present invention in a boiler in which a partition superheater flow path 23 and a reheater flow path 24 are formed in the vertical direction by No. 2. Incidentally, the same reference numerals as those in FIG. 14 indicate the same elements.

A superheater 25 provided in the superheater flow path 23,
The partition tubes forming the partition walls 22 are directed toward the rear wall 4b of the rear heat transfer section 4 in the same manner as shown in FIG. 2 so that every two tubes are inserted between the heat transfer tubes 31 forming 26. The support tube 43 is made to project and the reheater flow path 24
Between the heat transfer tubes 32 forming the reheaters 27, 28 provided at the partition wall 2 so that every two tubes are inserted.
The partition tube for forming 2 is projected toward the front wall 4a of the rear heat transfer section 4 in the same manner as shown in FIG. Further, as described above, the support tubes 43, 44 formed by projecting toward the rear wall 4b and the front wall 4a of the rear heat transfer portion 4 are formed.
In the same manner as the support system shown in FIGS. 12 and 13, the inside of the bent end of the heat transfer tube 31 on the partition wall 22 side for forming the superheaters 25, 26 and the transfer for forming the reheaters 27, 28. The insides of the bent ends of the heat pipes 32 on the partition wall 22 side are supported. On the other hand, the bent end portion of the heat transfer tube 31 forming the superheaters 25 and 26 located on the rear wall 4b side of the rear heat transfer section 4 is connected to the furnace wall tube 11 forming the rear wall 4b of the rear heat transfer section 4. ,
In the same manner as the supporting system shown in FIG. 9, the holding metal fitting 13 and the locking tool 16 are used for supporting, and the reheaters 27, 28 are also supported.
The bent end located on the front wall 4a side of the rear heat transfer section 4 for forming the heat transfer tube 32 is attached to the furnace wall tube 11 forming the front wall 4a of the rear heat transfer section 4 by the support method shown in FIG. Similarly, it is supported using the holding metal fitting 13 and the locking tool 16. 4 in the figure
Reference numeral 5 is a header.

Therefore, the heat transfer tube 31 forming the superheaters 25 and 26 and the heat transfer tube 32 forming the reheaters 27 and 28 are
Since the rear heat transfer section 4 can be supported in a movable state in the front-rear direction A and the width direction, vibration and expansion and contraction that occur during boiler operation can be supported, and the heat transfer tubes 31 and 32 on the side of the partition wall 22 can be supported. Since it supports a portion deviated to the other end side (the rear wall 4b and the front wall 4a side of the rear heat transfer portion 4) rather than the end, it is convenient to deal with preventing the central portion from being bent, and the heat transfer tube Since it is not necessary to provide a dedicated support pipe in the rear heat transfer section 4 to support the members 31 and 32, the mechanism is simple and economical.

FIG. 4 is a modification of the one shown in FIG. 3, in which any of the furnace wall tubes 11 forming the rear wall 4b of the rear heat transfer section 4 is directed to the partition wall 22. Of the furnace wall pipes 11 that protrude to form the support pipes 46 and form the front wall 4a of the rear heat transfer portion 4, any furnace wall pipe 11 is partitioned into the partition wall 22.
Toward the support tubes 47, and these support tubes 4
6 and 47 in the same manner as shown in FIG.
Between the heat transfer tubes 31 for forming the heat exchangers, and between the heat transfer tubes 32 for forming the reheaters 27 and 28, and every other two of them are projected in the vertical direction, respectively, in the same manner as the supporting method shown in FIGS. 12 and 13. The portions of the heat transfer tubes 31 forming the superheaters 25, 26 and the heat transfer tubes 32 forming the reheaters 27, 28 on the side of the partition wall 22 at the bent ends on the furnace wall side of the respective rear heat transfer parts 4 It is supported by the support tubes 46 and 47. On the other hand, the superheaters 25 and 26
The bent end of the heat transfer tube 31 on the side of the partition wall 22,
In addition, the partition wall 2 of the heat transfer tube 32 that forms the reheaters 27 and 28
The bent ends on the second side are respectively supported by the partition tube forming the partition wall 22 using the holding metal fitting 13 and the locking tool 16 in the same manner as the supporting system shown in FIG. Also in this case, FIG.
As in the embodiment shown in FIG. 7, since the bent end portion of the rear heat transfer section 4 of each of the heat transfer tubes 31 and 32 on the furnace wall side, which is displaced to the partition wall 22 side, is supported, the horizontal portion is not bent. In addition, it is convenient, and it is not necessary to provide a dedicated support tube for supporting the heat transfer tubes 31 and 32 in the rear heat transfer section 4, so that the mechanism is simple and economical. 48,4 in the figure
Reference numeral 9 is a header.

In the structure shown in FIG. 4, the support formed by projecting the partition tube of the partition wall 22 toward the rear wall 4b of the rear heat transfer section 4 on the superheater flow path 23 side as shown in FIG. The partition wall 22 of the superheaters 25 and 26 by the pipe 43
Side of the bent end of the rear wall of the rear heat transfer section 4 as shown in FIG. The partition wall 2 of the reheaters 27, 28 by the support tube 44 formed by
It is optional to support the bent end on the second side.

In FIG. 5, a bending wall portion 50 that bends toward the reheater flow path 24 is provided on the gas downstream side of the partition wall 22, and the bending wall portion 5 is provided.
A reheater 51 is provided downstream of the reheater passage 24 having a smaller flow passage cross-sectional area by 0, and a superheater is provided downstream of the superheater passage 23 having a larger flow passage cross-sectional area due to the bent wall portion 50. It shows an embodiment of the present invention in a boiler provided with a vessel (or economizer) 52 respectively. The same symbols as in FIG. 3 indicate the same items.

As shown in FIG. 6, the partition pipes 53 forming the partition wall 22 which is continuous above and below the bending wall portion 50 of the partition wall 22 are provided at an appropriate number of intervals (although in the figure, they are reheated). The heat transfer tubes 32 forming the heat exchangers 27 and 28 and the heat transfer tubes 56 forming the superheater 52 may be arranged every two or three in accordance with the pitch in the width direction of the rear heat transfer section 4). Raise or lower to form the support tubes 54 and 55,
Every two tubes are placed between the heat transfer tubes 32 forming the reheaters 27 and 28, the support tubes 54 are inserted and positioned as shown in FIG. 2, and every two tubes are inserted between the heat transfer tubes 56 forming the superheater 52. As shown in FIG. 2, the support tube 55 is placed at the insertion position.
In addition, the support tubes 54 and 55 which are positioned as described above are inserted.
Similarly to the support method shown in FIGS. 12 and 13, the inside of the bent end of the heat transfer tube 32 forming the reheaters 27, 28 on the side of the partition wall 22 and the heat transfer tube 5 forming the superheater 52.
The insides of the bent ends of the partition wall 6 on the side of the partition wall 22 are supported. On the other hand, the heat transfer tube 32 forming the reheaters 27 and 28
Of the bent end located on the front wall 4a side of the rear heat transfer part 4,
A heat transfer tube 56 for supporting the furnace wall tube forming the front wall 4a of the rear heat transfer section 4 using the holding metal fitting 13 and the locking tool 16 in the same manner as the supporting system shown in FIG. 9 and for forming the superheater 52. The bent end located on the rear wall 4b side of the rear heat transfer part 4 is attached to the holding metal fitting 13 and the engaging metal fitting in the furnace wall tube forming the rear wall 4b of the rear heat transfer part 4 in the same manner as the supporting system shown in FIG. Stop 16
To support it. Further, the bent end portions of the heat transfer tube 31 forming the superheaters 25 and 26 on the partition wall 22 side and the rear wall 4b side of the rear heat transfer section 4 are formed, and the heat transfer tube 5 forming the reheater 51 is formed.
7, the bent end portions of the partition wall 22 side and the rear heat transfer portion 4 on the rear wall 4b side of the holding metal fitting 1 are arranged in the same manner as the supporting system shown in FIG.
3 and the fastener 16 are used to support each. Also in this case, as in the above-described embodiment, the horizontal portions of the reheaters 27, 28 and the superheater 52 can be dealt with so as not to bend, and a dedicated support pipe is provided in the rear heat transfer portion 4. The mechanism is simple and economical without the need. In the figure, reference numerals 58 and 59 are heading.

FIG. 7 is a modification of that shown in FIG. 5, and the furnace wall tube 11 for forming the rear wall 4b of the rear heat transfer section 4 in the superheater passage 23 is similar to the embodiment shown in FIG. Among the above, the heat transfer tube 31 forming the superheaters 25 and 26 and the heat transfer tube 5 forming the superheater 52 are formed by the support tube 47 formed by projecting an arbitrary furnace wall tube 11 toward the partition wall 22 side.
6, the inside of the bent end on the rear wall 4b side of the rear heat transfer section 4 (on the side of the partition wall 22) is supported. In this case as well, the superheaters 25, 26, In addition, it is possible to deal with the bending of the horizontal portion of the superheater 52, and it is not necessary to provide a dedicated support tube in the rear heat transfer section 4, so that the mechanism is simple and economical.

The present invention is not limited to the illustrated and described embodiments, but may be arbitrarily applied to, for example, a boiler provided with a heat transfer section in a horizontal position above the furnace. It goes without saying that various changes can be made without departing from the gist of the above.

[0032]

As described above, the first and second aspects are provided.
In any of the boilers according to the present invention described in 1), it is convenient to be able to support a heated device such as a superheater or a reheater without bending, and to support a heated device such as a superheater or a reheater. It is not necessary to separately provide a dedicated support tube in the heat transfer section, and the mechanism can be simplified, which is economical, and various other advantageous effects can be achieved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of a boiler of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a vertical sectional side view showing another example of the boiler of the present invention.

FIG. 4 is a vertical sectional side view showing a modified example of the boiler of the present invention shown in FIG.

FIG. 5 is a vertical sectional side view showing still another example of the boiler of the present invention.

FIG. 6 is a perspective view showing a bent wall portion of the partition wall of FIG.

7 is a vertical sectional side view showing a modified example of the boiler of the present invention shown in FIG.

FIG. 8 is a vertical sectional side view showing an example of a conventional boiler.

9 is an enlarged detailed view of an IX section in FIG.

10 is a vertical cross-sectional side view showing a modified example of the conventional boiler shown in FIG.

11 is a diagram showing a main part of the conventional boiler shown in FIG.

12 is a diagram showing a support state of heat transfer tubes in the boiler shown in FIG.

13 is a view taken in the direction of arrow XIII-XIII in FIG.

FIG. 14 is a vertical sectional side view showing another example of a conventional boiler.

[Explanation of symbols]

 1 Furnace 2 Burner 4 Rear Heat Transfer Section 4a Front Wall 4b Rear Wall 5 Secondary Side Wall 6 Heated Device 7 Heat Transfer Tube 9 Exhaust Gas Duct 11 Furnace Wall Tube 22 Partition Wall 23 Superheater Flow Path 24 Reheater Flow Path 25 Superheater 26 Superheater 27 Reheater 28 Reheater 31 Heat transfer tube 32 Heat transfer tube 41 Support tube 43 Support tube 44 Support tube 46 Support tube 47 Support tube 50 Bending wall section 51 Reheater 52 Superheater (or economizer) 53 Partition Tube 54 Support Tube 55 Support Tube 56 Heat Transfer Tube 57 Heat Transfer Tube

Claims (2)

[Claims] 1. A boiler comprising a heat transfer unit, such as a reheater or a superheater, in which a plurality of heat transfer tubes each having a meandering shape in a vertical direction are formed in parallel. A boiler characterized in that one side of a bent end of a heat transfer tube to be formed is supported by a furnace wall, and the other side is supported by a support tube projecting inward from the furnace wall. 2. A reheater, a superheater or the like in which a plurality of heat transfer tubes having a meandering shape in the vertical direction are formed in parallel in a plurality of combustion gas passages in which a heat transfer section is vertically partitioned by a partition wall. In the boiler in which each of the heated devices is arranged, one side of the bent end of the heat transfer tube forming the heated device is projected to the furnace wall or partition wall, and the other side is projected from the partition wall to the furnace wall. A boiler characterized in that it is supported by a support pipe or a support pipe projecting from the furnace wall toward the partition wall.