JP6486763B2 - Vertical heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger, and more particularly, to a shell and tube type vertical heat exchanger.

  In a power plant or the like, a shell and tube heat exchanger is used. FIG. 4 is a longitudinal sectional view of a conventional vertical heat exchanger. The shell-and-tube heat exchanger 100 includes an inner casing (tube side casing) 2 in which the heat transfer tubes 3 are housed, and an outer casing (trunk side casing) 1 in which the inner casing 2 is housed. Heat exchange is performed between the tube-side fluid introduced into the heat transfer tube 3 from the outer casing 1 and the trunk-side fluid introduced from the outer casing 1 to the outer peripheral portion of the heat transfer tube 3.

  By placing the upper end flange 2 a of the inner casing 2 on the upper end flange 1 a of the outer casing 1, a gap 6 is formed between the outer casing 1 and the inner casing 2, and the inner casing 2 is moved from above the outer casing 1. It is supported so that it can be pulled out.

  At the time of heat exchange, the pipe-side fluid enters the inner casing 2 from the inlet 11 provided in the inner casing 2 and passes through the inside of the heat transfer pipe 3. The trunk side fluid enters the inner casing 2 from the trunk side fluid inlet 9 provided in the outer casing 1 through the trunk side fluid inlet 4 provided in the inner casing 2 and passes through the outer peripheral portion of the heat transfer tube 3. After exchanging heat with the pipe-side fluid that passes through the inside of the heat transfer pipe 3, it flows through the trunk-side fluid outlet 5 provided on the side surface of the inner casing 2 and flows out from the trunk-side fluid outlet 10 provided on the outer casing 1. To do.

  When the trunk side fluid flows from the trunk side fluid inlet 9 to the trunk side fluid inlet 4, a part of the trunk side fluid flows into the gap 6. The trunk side fluid flowing into the gap 6 is called a bypass flow. Since the bypass flow that flows through the gap 6 between the outer casing 1 and the inner casing 2 is an ineffective flow that does not contribute to heat exchange, it causes a decrease in heat transfer efficiency. For this reason, it is necessary to provide the partition structure 20 between the outer casing 1 and the inner casing 2 in order to prevent and suppress the bypass flow and to block the flow path of the gap portion 6. On the other hand, it is necessary to provide a drain hole (drain hole) in the partition structure 20 in order to discharge the fluid accumulated in the gap 6 during maintenance of the heat exchanger 100 or the like.

  In Patent Document 1, the drain hole 19 is closed during operation to prevent a bypass flow, and the cylinder side fluid remaining in the gap 11 can be discharged when the operation is stopped. A heat exchanger 1 in which a flow path control mechanism is provided in an intermediate flange (partition structure) 12 is disclosed. This flow path control mechanism includes a bimetal 14 curved upward toward the tip, and a valve body 17 attached to the tip of the bimetal 14 and supported immediately above the drain hole 14. When the temperature of the coolant (cylinder-side fluid) around 19 increases, the curvature of the bimetal 14 becomes smaller, so that the valve body 17 closes the drain hole 19 and the coolant (cylinder-side fluid) around the drain hole 19 when the operation is stopped. When the temperature of) decreases, the bending of the bimetal 14 increases and the valve body 17 opens the drain hole 19.

  Further, in Patent Document 2, using the difference in thermal expansion between the outer casing 1 and the inner casing 2, the closing plug 5 closes the drain hole 8 during operation, and the closing plug 5 closes the drain hole 8 during operation stop. A vertical heat exchanger configured to open is disclosed.

JP-A-2-52991 JP 2014-214990 A

  Since the flow path control mechanism of Patent Document 1 uses the temperature change of the trunk side fluid around the drain hole 19 to close and open the drain hole 19, the temperature change is small between operation and operation stop. This causes a problem that the drain hole 19 cannot be closed during operation, or the drain hole 19 cannot be opened during non-operation.

  In addition, the vertical heat exchanger of Patent Document 2 uses the difference in thermal expansion between the outer casing 1 and the inner casing 2 to close and open the drain hole 8, so that the heat is generated during operation and when operation is stopped. When the expansion difference is small, there arises a problem that the drain hole 8 cannot be closed at the time of operation or the drain hole 8 cannot be opened at the time of operation stop.

  The present invention has been made in view of the above-described problems, and the purpose of the present invention is when the temperature of the trunk side fluid around the drain hole does not change greatly between operation and non-operation, or between the outer casing and the inner casing. To provide a vertical heat exchanger capable of closing a drain hole during operation and opening a drain hole when operation is stopped even when a difference in thermal expansion is small.

In order to solve the above problems, the present invention includes an inner casing that houses a heat transfer tube and into which a pipe-side fluid is introduced, an outer casing that houses the inner casing and into which a trunk-side fluid is introduced, and the inner casing provided on the outer peripheral surface of an outer peripheral flange drain hole is formed, provided on the inner peripheral surface of the outer casing, an inner peripheral flange outer peripheral portion of said peripheral flange is placed, below the peripheral flange A vertical body provided with a floating body that can be raised and lowered, and a closing plug that is provided so as to close the drain hole as the floating body rises and to open the drain hole as the floating body descends The heat exchanger is provided with a swing fulcrum member attached to the lower side of the outer peripheral flange, a swing member attached to the swing fulcrum member so as to be swingable, and inserted into the drain hole. , One of the swing members Those further comprising a handle member having a lower end attached to an end portion, the floating body is attached to the other end of the swinging member, the closure plug, which is attached to an upper end portion of the handle member And
Alternatively, the present invention is provided on the outer casing of the inner casing that houses the heat transfer tube and into which the pipe-side fluid is introduced, the outer casing that houses the inner casing and into which the trunk-side fluid is introduced, and the inner casing. An outer peripheral flange in which a drain hole is formed; an inner peripheral flange provided on the inner peripheral surface of the outer casing; and an outer peripheral flange on which the outer peripheral portion of the outer peripheral flange is placed; A vertical heat exchanger comprising: a floating body; and a closure plug provided to close the drain hole as the floating body rises and to open the drain hole as the floating body descends. A swing fulcrum member attached to the lower side of the outer peripheral flange, a swing member attached to the swing fulcrum member in a swingable manner, and inserted into the drain hole. One end has a lower end Ri attached is further provided with a handle member, the floating body is attached to the other end of the swinging member, the closure plug shall be attached to the upper end of the handle member.

  According to the vertical heat exchanger according to the present invention, even when the temperature of the trunk side fluid around the drain hole does not change greatly during operation and when the operation is stopped, or even when the difference in thermal expansion between the outer casing and the inner casing is small. Since the drain hole can be closed during operation and the drain hole can be opened during operation stop, heat transfer efficiency during operation and maintainability during operation stop are improved.

1 is a longitudinal sectional view of a vertical heat exchanger according to an embodiment of the present invention. It is A arrow line view of FIG. 1 which shows the drain-hole opening / closing mechanism at the time of operation stop of the vertical heat exchanger by Example 1 of this invention. It is A arrow directional view of FIG. 1 which shows the drain hole opening / closing mechanism at the time of the non-operation of the vertical heat exchanger by Example 1 of this invention. FIG. 5 is a view as viewed from the direction of the arrow A in FIG. 1 showing a drain hole opening / closing mechanism when the vertical heat exchanger according to the second embodiment of the present invention is stopped. FIG. 5 is a view as viewed from the direction of the arrow A in FIG. 1 showing a drain hole opening / closing mechanism when the vertical heat exchanger according to the second embodiment of the present invention is stopped. It is a longitudinal cross-sectional view of the vertical heat exchanger by a prior art.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same member and the overlapping description is abbreviate | omitted suitably.

  FIG. 1 is a longitudinal sectional view of a vertical heat exchanger according to a first embodiment of the present invention. A vertical heat exchanger 100 according to this embodiment includes an inner casing (tube side casing) 2 in which a heat transfer tube 3 is housed, and an outer casing (trunk side casing) 1 in which the inner casing 2 is housed. Heat exchange is performed between the tube-side fluid introduced from 2 into the heat transfer tube 3 and the trunk-side fluid introduced from the outer casing 1 to the outer periphery of the heat transfer tube 3.

  An upper end flange 1 a is provided at the upper end outer peripheral portion of the outer casing 1, and an upper end flange 2 a is provided at the upper end outer peripheral portion of the inner casing 2. By placing the upper end flange 2 a of the inner casing 2 on the upper end flange 1 a of the outer casing 1, a gap 6 is formed between the outer casing 1 and the inner casing 2, and the inner casing 2 is moved from above the outer casing 1. It is supported so that it can be pulled out.

  A side surface portion of the outer casing 1 is provided with a trunk side fluid inlet 9 for introducing the trunk side fluid into the outer casing 1, and the lower end portion of the outer casing 1 is configured to pass the trunk side fluid to the vertical heat exchanger. A trunk side fluid outlet 10 is provided for discharging to the outside of 100.

  A tube-side fluid inlet 11 for introducing the tube-side fluid into the heat transfer tube 3 at the upper end of the inner casing 2 and the tube-side fluid that has passed through the heat transfer tube 3 are discharged to the outside of the vertical heat exchanger 100. And a tube-side fluid outlet 12 is provided. Further, the side surface portion of the inner casing 2 passes through the trunk side fluid inlet 4 for introducing the trunk side fluid introduced into the outer casing 1 into the outer peripheral portion of the heat transfer tube 3 and the outer peripheral portion of the heat transfer tube 3. A cylinder-side fluid outlet 5 is provided for discharging the cylinder-side fluid to the outside of the inner casing 1.

  The pipe-side fluid introduced into the inner casing 2 through the pipe-side fluid inlet 11 is introduced into the heat transfer pipe 3 and passes through the outer periphery of the heat transfer pipe 3 while passing through the heat transfer pipe 3. Heat exchange with side fluid. The tube-side fluid that has passed through the inside of the heat transfer tube 3 is discharged to the outside of the vertical heat exchanger 100 via the tube-side fluid outlet 12.

  On the other hand, the trunk side fluid introduced into the outer casing 1 through the trunk side fluid inlet 9 is introduced into the inner casing 2 through the trunk side fluid inlet 4 and passes through the outer peripheral portion of the heat transfer tube 3. However, heat is exchanged with the tube-side fluid passing through the heat transfer tube 3. The trunk side fluid that has passed through the outer periphery of the heat transfer tube 3 is discharged to the gap 6 through the trunk side fluid outlet 5, and is discharged to the outside of the vertical heat exchanger 100 through the trunk side fluid outlet 10.

  Here, a part of the trunk side fluid introduced from the trunk side fluid inlet 9 into the outer casing 1 is not introduced into the inner casing 2 from the trunk side fluid inlet 4, so that the outer casing 1 and the inner casing 1 2 is discharged to the outside of the vertical heat exchanger 100 through the trunk-side fluid outlet 10 through the gap 6 formed between the two and a bypass flow is formed. Since the bypass flow does not contribute to heat exchange with the pipe-side fluid passing through the inside of the heat transfer tube 3, the heat transfer efficiency is reduced. Therefore, the vertical heat exchanger 100 according to the present embodiment partitions the gap 6 into the upper space 6a and the lower space 6b between the trunk side fluid inlet 4 and the trunk side fluid outlet 5 of the inner casing 2, A partition structure 20 that suppresses the bypass flow through the gap 6 is provided.

  The partition structure 20 includes an outer peripheral flange 8 provided on the outer peripheral surface of the inner casing 2 and an inner peripheral flange 7 provided on the inner peripheral surface of the outer casing 1. The outer peripheral portion of the outer peripheral flange 8 of the inner casing 2 is placed on the inner peripheral flange 7 of the outer casing 1 and is brought into close contact with each other without any gap, thereby blocking communication between the upper space 6a and the lower space 6b of the gap portion 6. Can do. Since the outer peripheral flange 8 and the inner peripheral flange 7 are not fixed to each other by welding or the like, the inner casing 2 is easily separated by being pulled out from above the outer casing 1.

  Here, when the operation of the vertical heat exchanger 100 is stopped, it is necessary to stop the operation and discharge (drain) the cylinder side fluid remaining in the gap, so that the drain hole 31 (see FIG. 2) and a drain hole opening / closing mechanism 30 are provided. The drain hole opening / closing mechanism 30 closes the drain hole 31 when the vertical heat exchanger 100 is operated, and opens the drain hole 31 when the vertical heat exchanger 100 is stopped.

  The configuration of the drain hole opening / closing mechanism 30 will be described with reference to FIG. FIG. 2 is a view taken along the arrow A in FIG. 1 showing the drain hole opening / closing mechanism 30 when the vertical heat exchanger 100 is stopped.

  In FIG. 2, the drain hole opening / closing mechanism 30 includes a drain pipe 21 inserted and attached to the drain hole 31 of the outer peripheral flange 8, a magnet-equipped shut plug 23 for closing the inlet side opening of the drain pipe 21, and A guide tube 24 inserted through the mounting hole 28 of the outer peripheral flange 8, a rod-like member 26 provided inside the guide tube 24 so as to be movable up and down, a magnet 27 attached to the upper end of the rod-like member 26, And a floating body 25 attached to the lower end of the rod-shaped member 26.

  The drain pipe 21 is formed in an inverted J shape so that the inlet side opening 22 a is disposed above the outer peripheral flange 8 and the outlet side opening 22 b is disposed below the outer peripheral flange 8. The attachment hole 28 is formed immediately below the inlet side opening 22 a of the drain pipe 21. The upper end portion of the guide tube 24 is closed, and the height of the upper end surface of the guide tube 24 coincides with the height of the upper surface of the outer peripheral flange 8.

  The magnet-equipped shut plug 23 includes a shut plug part 23a for closing the inlet side opening 22a of the drain pipe 21, and a magnet part 23b attached to the lower side of the shut plug part 23a. The magnet-equipped shut plug 23 is disposed between the inlet opening 22a and the guide tube 24 so as to be movable up and down. The inlet-side opening 22a is formed in a funnel shape, and the inlet-side opening 22a is closed when the magnet-attached stopper plug 23 is raised, and the inlet-side opening 22a is opened when the magnet-attached stopper 23 is lowered.

  A lower end flange 24 a is provided at the lower end opening of the guide tube 24 so as to protrude toward the inner diameter side. The lower end flange 24 a is engaged with an outer peripheral flange 26 a provided at a predetermined height on the outer peripheral surface of the rod-shaped member 26. By doing so, it is possible to prevent the rod-shaped member 26 from falling off the guide tube 24. The magnet 27 and the magnet portion 23b of the magnet-equipped shut-off plug 23 are arranged so that the same magnetic poles face each other.

  The operation of the drain hole opening / closing mechanism 30 will be described with reference to FIGS. FIG. 3 is a view taken along the arrow A in FIG. 1 showing the drain hole opening / closing mechanism 40 during operation of the vertical heat exchanger 100.

  When the vertical heat exchanger 100 is in operation, the cylinder side fluid is supplied through the cylinder side fluid inlet 9, and the upper space 6a and the lower space 6b of the gap 6 are filled with the cylinder side fluid. As shown, the floating body 25 provided on the lower side of the outer peripheral flange 8 rises in response to the buoyancy of the trunk side fluid filled in the lower space 6b. As the floating body 25 rises, the rod-like member 26 attached to the floating body 25 and the magnet 27 attached to the upper end thereof rise. When the magnet 27 approaches the magnet part 23b of the closing plug 23 with magnet, a repulsive force acts on the magnet part 23b, and the closing plug 23 with magnet is pushed up. Thereby, the inlet side opening part 22a of the drain pipe 21 is obstruct | occluded by the closing plug part 23a of the closing plug 23 with a magnet, and the bypass flow which passes the drain hole 31 is suppressed.

  On the other hand, when the operation of the vertical heat exchanger 100 is stopped, the supply of the cylinder side fluid through the cylinder side fluid inlet 9 is stopped and the cylinder side fluid staying in the lower space 6b of the gap 6 is Since it is discharged to the outside of the vertical heat exchanger 100 through the trunk side fluid outlet 10, the lower space 6b is opened. As a result, the buoyancy acting on the floating body 25 disappears, and the floating body 25 is lowered by its own weight as shown in FIG. When the floating body 25 attached to the lower end portion of the rod-like member 26 is lowered, the rod-like member 26 and the magnet 27 attached to the upper end thereof are also lowered. When the magnet 27 moves away from the magnet portion 23 of the magnet-equipped stop plug 23, the repulsive force acting on the magnet portion 23b is reduced, and the magnet-equipped stop plug 23 is lowered by its own weight. As a result, the inlet side opening 22a of the drain pipe 21 is opened, and the trunk side fluid remaining in the upper space 6a of the gap 6 is discharged to the lower space 6b through the drain hole 31 pipe 21, and the trunk side fluid outlet 10 is discharged. Is discharged to the outside of the vertical heat exchanger 100.

  According to the vertical heat exchanger 100 according to the present embodiment, by operating the lifting and lowering of the magnetic stopper plug 23 using the buoyancy and gravity acting on the floating body 25 arranged in the lower space of the outer peripheral flange 8, Even when the temperature of the cylinder side fluid around the drain hole 31 does not change greatly when the operation is stopped or when the difference in thermal expansion between the outer casing 1 and the inner casing 2 is small, the drain hole 31 is closed during the operation to bypass the flow. Since the fluid remaining in the upper space of the outer peripheral flange 8 can be discharged by opening the drain hole 31 when the operation is stopped, the heat transfer efficiency during the operation and the maintainability when the operation is stopped are improved.

  A vertical heat exchanger 100 according to Embodiment 2 of the present invention will be described with reference to FIGS. 4 and 5. The vertical heat exchanger 100 according to the present embodiment is an embodiment example except that a drain hole opening / closing mechanism 40 shown in FIGS. 4 and 5 is provided in place of the drain hole opening / closing mechanism 30 (see FIG. 2) according to the first embodiment. 1 is the same as the vertical heat exchanger 100 (see FIG. 1) shown in FIG.

  The configuration of the drain hole opening / closing mechanism 40 will be described with reference to FIG. FIG. 4 is a view taken along the arrow A in FIG. 1 showing the drain hole opening / closing mechanism 40 when the operation of the vertical heat exchanger 100 is stopped.

  In FIG. 4, the drain hole opening / closing mechanism 40 is attached to the swing fulcrum member 35 attached to the lower side of the outer peripheral flange 8 and is swingably attached to the swing fulcrum member 35 via a connecting pin 34 a. The swing member 34, a handle member 33 that is rotatably attached to one end portion of the swing member 34 via a connecting pin 34 b, and that can be inserted into the drain hole 31, and an upper end of the handle member 33 And a floating body 25 attached to the other end of the swing member 34.

  The operation of the drain hole opening / closing mechanism 40 will be described with reference to FIGS. FIG. 5 is a view taken along the arrow A in FIG. 1 showing the drain hole opening / closing mechanism 40 during operation of the vertical heat exchanger 100.

  When the vertical heat exchanger 100 is in operation, the trunk side fluid is supplied through the trunk side fluid inlet 9, and the upper space 6a and the lower space 6b of the gap 6 are filled with the trunk side fluid. As shown, the floating body 25 provided on the lower side of the outer peripheral flange 8 rises in response to the buoyancy of the trunk side fluid filled in the lower space 6b. As the floating body 25 attached to one end of the swing member 34 rises, the swing member 34 swings in the clockwise direction in the figure, and the handle member attached to the other end of the swing member 34. 33 descends in the drain hole 31. When the upper end of the handle member 33 reaches the drain hole 31, the drain hole 31 is closed by the closing plug 32 attached to the upper end of the handle member 33, and the bypass flow passing through the drain hole 31 is suppressed.

  On the other hand, when the operation of the vertical heat exchanger 100 is stopped, the supply of the cylinder side fluid through the cylinder side fluid inlet 9 is stopped and the cylinder side fluid staying in the lower space 6b of the gap 6 is Since it is discharged to the outside of the vertical heat exchanger 100 through the trunk side fluid outlet 10, the lower space 6b is opened. As a result, the buoyancy acting on the floating body 25 disappears, and the floating body 25 descends by its own weight as shown in FIG. When the floating body 25 attached to one end of the swing member 34 descends, the swing member 34 swings in the counterclockwise direction shown in the figure, and the handle attached to the other end of the swing member 34. The stopper plug 32 is pushed up by the member 33. As a result, the drain hole 31 is opened, and the fluid remaining in the upper space of the outer peripheral flange 8 is discharged to the lower space 6 b through the drain hole 31, and outside the vertical heat exchanger 100 through the trunk side fluid outlet 10. To be discharged.

  According to the vertical heat exchanger 100 according to the present embodiment, as with the vertical heat exchanger 100 according to the first embodiment (see FIG. 1), buoyancy and gravity acting on the floating body 25 disposed in the lower space of the outer peripheral flange 8. When the temperature of the trunk side fluid around the drain hole 31 does not change greatly during operation and after operation stop, or when the outer casing 1 and the inner casing 2 are thermally expanded, Even when the difference is small, the drain hole 31 is closed during operation to suppress the bypass flow, and when the operation is stopped, the drain hole 31 can be opened and the fluid remaining in the upper space of the outer peripheral flange 8 can be discharged. Thermal efficiency and maintainability during shutdown are improved.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, in the above-described embodiment, a configuration including one drain hole opening / closing mechanism 30 or 40 is shown, but the present invention is not limited to this, and a configuration including a plurality of drain hole opening / closing mechanisms 30 or 40 may be used. In that case, it is preferable to arrange them at regular intervals.

  The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, or the configuration of another embodiment can be added to the configuration of one embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 100 ... Vertical heat exchanger, 1 ... Outer casing, 1a ... Upper end flange of outer casing, 2 ... Inner casing, 2a ... Upper end flange of inner casing, 3 ... Heat transfer pipe, 4 ... Body side fluid inlet of inner casing, 5 ... barrel side fluid outlet of inner casing, 6 ... gap, 6a ... upper space, 6b ... lower space, 7 ... inner circumference flange of outer casing, 8 ... outer circumference flange of inner casing, 9 ... trunk side fluid inlet of outer casing DESCRIPTION OF SYMBOLS 10 ... Body side fluid outlet of outer casing, 11 ... Pipe side fluid inlet of inner casing, 12 ... Pipe side fluid outlet of inner casing, 20 ... Partition structure, 21 ... Drain pipe, 22a ... Inlet side opening, 22b ... Outlet side opening, 23 ... Stopper with magnet, 23a ... Stopper, 23b ... Magnet, 24 ... Guide tube, 24a ... Lower end flange, 25 ... Floating body, 26 ... Rod-like member, 26a ... Outer flange, 2 ... Magnets, 28 ... Mounting holes, 30, 40 ... Drain hole opening / closing mechanism, 31 ... Drain holes, 32 ... Closure plugs, 33 ... Handle members, 34 ... Swing members, 34a, 34b ... Connecting pins, 35 ... Swing Support member

Claims (2)

An inner casing that houses the heat transfer tube and into which the pipe-side fluid is introduced;
An outer casing that houses the inner casing and into which the trunk side fluid is introduced;
An outer peripheral flange provided on the outer peripheral surface of the inner casing and having a drain hole formed thereon;
An inner peripheral flange provided on an inner peripheral surface of the outer casing, on which an outer peripheral portion of the outer peripheral flange is placed;
A floating body provided on the lower side of the outer peripheral flange so as to be movable up and down;
In a vertical heat exchanger comprising a closure plug provided to close the drain hole as the floating body rises and to open the drain hole as the floating body descends,
An inverted J-shaped drain pipe provided to be inserted through the drain hole, an inlet side opening is disposed on the upper side of the outer peripheral flange, and an outlet side opening is disposed on the lower side of the outer peripheral flange;
A guide tube attached by being inserted through an attachment hole of the outer peripheral flange formed directly under the inlet side opening;
A rod-like member provided to be movable up and down in the guide tube;
A first magnet attached to the upper end of the rod-shaped member;
The floating body is attached to the lower end of the rod-shaped member,
The closing plug has a second magnet that is disposed between the inlet opening and the guide tube, and is attached to the lower side thereof so that the same magnetic pole as the first magnet is opposed to the stopper. A featured vertical heat exchanger. An inner casing that houses the heat transfer tube and into which the pipe-side fluid is introduced;
An outer casing that houses the inner casing and into which the trunk side fluid is introduced;
An outer peripheral flange provided on the outer peripheral surface of the inner casing and having a drain hole formed thereon;
An inner peripheral flange provided on an inner peripheral surface of the outer casing, on which an outer peripheral portion of the outer peripheral flange is placed;
A floating body provided on the lower side of the outer peripheral flange so as to be movable up and down;
In a vertical heat exchanger comprising a closure plug provided to close the drain hole as the floating body rises and to open the drain hole as the floating body descends,
A swing fulcrum member attached to the lower side of the outer peripheral flange;
A swing member attached to the swing fulcrum member in a swingable manner;
A handle member provided so as to be insertable into the drain hole and having a lower end attached to one end of the swing member;
The floating body is attached to the other end of the swing member,
The vertical heat exchanger is characterized in that the stopper plug is attached to an upper end portion of the handle member.

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