JP2002333288A - Steam generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance heat exchange efficiency of a steam generator. SOLUTION: The steam generator comprises heat exchanging tubes (6) for heating supply water (3), and equalizing plates (11a, 11b). The supply water (3) moves in the first direction (+z axis direction), as a whole, when it is heated. The equalizing plate (11a, 11b) changes the moving direction of the supply water (3) locally to the second direction (±x axis direction) different from the first direction (+z axis direction). The equalizing plates (11a, 11b) are provided with first openings (12a, 12b) for passing a part of the supply water (3) in the first direction (+z axis direction). Since the first openings (12a, 12b) are provided, the supply water (3) is prevented from stagnating and heat exchange efficiency of the steam generator is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a steam generator. The invention particularly relates to a steam generator with an economizer.

[0002]

2. Description of the Related Art A steam generator for generating steam from a high-temperature heating medium heated to a high temperature is widely used in equipment using a steam turbine such as a power generation plant.

FIG. 11 shows the structure of a known steam generator. In FIG. 11, the x-axis, the y-axis, and the z-axis are respectively set in the directions indicated by reference numerals 120. The known steam generator comprises an outer shell 101. Outer trunk 101
Is provided with a water supply inlet nozzle 102. Water supply 103 is supplied to the water supply inlet nozzle 102 from outside.

Along the inner surface of the outer shell 101, a wrapper 10
4 are provided. The water supplied to the water supply inlet nozzle 102 is introduced into the heat exchange area 105 via the space between the outer shell 101 and the wrapper 104.

[0005] A heat transfer tube 106 is provided in the heat exchange area 105. Although a large number of heat transfer tubes 106 are actually provided, in FIG. 11, in order to avoid complexity of the drawing,
Only one of the conduction tubes 106 is shown. Heat transfer tube 1
Reference numeral 06 is connected to the inlet water chamber 107 and the outlet water chamber 108. The inlet water chamber 107 is supplied with a high-temperature heating fluid 109 heated to a high temperature from a heat source such as a nuclear reactor. The high-temperature heating fluid 109 flows into the heat transfer tube 106 via the inlet water chamber 107 and flows through the outlet water chamber 108. The hot heating fluid 109 flows out of the steam generator from the outlet water chamber 108 and is returned to a heat source such as a nuclear reactor.

[0006] High-temperature heating fluid 1 passing through heat transfer tube 106
09 heats the feedwater 103 introduced into the heat exchange area 105. The heated feed water 103 flows as a whole above the steam generator, that is, in the + z-axis direction.

[0007] In order to increase the efficiency of transferring heat from the high temperature heating fluid 109 to the feedwater 103, the heat exchange region 105 has a structure described below.

[0008] In the heat exchange area 105, a partition plate 110 is provided. The partition plate 110 defines the heat exchange region 105,
It is separated into a high temperature side region 105a and a low temperature side region 105b.

The high temperature side region 105a is a region in which a portion of the heat transfer tube 106 close to the inlet water chamber 107 is accommodated. On the other hand, the low-temperature side region 105b is a region in which a portion of the heat transfer tube 106 close to the outlet water chamber 108 is accommodated. The high-temperature heating fluid 109 flowing through a portion of the heat transfer tube 106 in the low-temperature side region 105 b is
The temperature is lower than that of the high-temperature heating fluid 109 flowing through the portion at a. Therefore, the efficiency of transferring heat from the high-temperature heating fluid 109 to the feedwater 103 is lower in the low-temperature region 105b than in the high-temperature region 105a.

In order to increase the efficiency of transferring heat from the high-temperature heating fluid 109 to the feed water 103, rectifying plates 111a and 111b are provided in the low-temperature region 105b. The current plate 111a is joined to the partition plate 110 described above.
The current plate 111b is joined to the wrapper 104 described above.

The flow regulating plate 111a controls the direction in which the feed water 103, which is about to flow above the steam generator, flows.
And the direction toward the wrapper 104, ie,
Change to + x axis direction. Similarly, the flow straightening plate 111b sets the direction in which the water supply 103 flows, perpendicular to the partition plate 110, and
The direction is changed to the direction toward the partition plate 110, that is, the −x axis direction.

The rectifying plates 111a and the rectifying plates 111b are provided alternately. As a result, the feedwater 103 in the low-temperature side region 105b gradually flows zigzag toward the upper side (+ z-axis direction) of the steam generator while creating a flow in the horizontal direction (± x-axis direction) of the steam generator. Flows. In the low-temperature side region 105b, the flow of heat from the high-temperature heating fluid 109 to the feed water 103 is increased by the zigzag flow of the feed water 103 as described above.

The high temperature side area 105a or the low temperature side area 10
The feed water 103 heated in 5b becomes a gas-liquid two-phase fluid 112 in which a gas phase and a liquid phase are mixed, and the steam-water separator 1
13 is introduced. The steam separator 113 separates the gas-phase component and the liquid-phase component of the gas-liquid two-phase fluid 112 to generate wet steam 114 that is steam containing moisture. Wet steam 114
Is introduced into the moisture separator 115. Moisture separator 115
Removes moisture from the wet steam 114 to produce dry steam 116 and supplies it to the outside of the steam generator. Steam separator 11
The liquid separated in 3 is mixed with the feed water 103 and the wrapper 1
It descends between 04 and outer trunk 101, and flows into a tube group again.

However, the known steam generator described above has a stagnation portion 11 where a water supply 103 stagnates near a portion where a partition plate 110 and a rectifying plate 111a are joined.
7a is completed. Similarly, the known steam generator has a stagnation portion 117b where the water supply 103 stagnates at a portion where the wrapper 104 and the flow straightening plate 111b are joined.
When the water supply 103 stagnates in the stagnation sections 117a and 117b,
The efficiency of transferring heat from the high-temperature heating fluid 109 to the water supply 103 decreases. For this reason, the heat exchange efficiency of the steam generator decreases.

It is desirable that the steam generator has a high heat exchange efficiency.

[0016]

SUMMARY OF THE INVENTION An object of the present invention is to provide a steam generator having a high heat exchange efficiency.

[0017]

Means for solving the problem are expressed as follows. The technical items appearing in the expression are appended with numbers, symbols, and the like in parentheses (). The numbers, symbols, and the like refer to technical matters constituting at least one of the embodiments of the present invention, particularly, technical matters expressed in the drawings corresponding to the embodiments. The reference numbers, reference symbols, and the like attached to are the same. Such reference numbers,
Reference symbols clarify the correspondence and bridging between the technical matters described in the claims and the technical matters in the embodiments. Such correspondence / bridge does not mean that the technical matters described in the claims are interpreted as being limited to the technical matters of the embodiments.

The steam generator according to the present invention includes a heat transfer tube (6) for heating a feed water (3) and rectifying plates (11a, 11b) (see FIG. 1). The water supply (3) moves in the first direction (+ z-axis direction) as a whole by being heated.
The current plates (11a, 11b) locally change the moving direction of the water supply (3) to a second direction (± x-axis direction) different from the first direction (+ z-axis direction). Rectifier plates (11a, 1
1b) is provided with first openings (12a, 12b) through which a part of the water supply (3) passes in the first direction (+ z-axis direction). By providing the first openings (12a, 12b), stagnation of the water supply (3) is prevented, and the heat exchange efficiency of the steam generator is improved.

The steam generator may further include walls (4, 10) extending in the first direction (+ z axis direction). The current plate (11a, 11b) is connected to the wall (4, 10).
To join. At this time, the first openings (12a, 12b)
Is desirably provided near a position where the walls (4, 10) and the flow straightening plates (11a, 11b) are joined. In the vicinity of the position where the walls (4, 10) and the flow straightening plates (11a, 11b) are joined, the water supply (3) tends to stagnate. , The first opening (12a, 12b) is formed between the wall (4, 10) and the current plate (11).
a, 11b) is provided in the vicinity of the joining position, thereby preventing stagnation of the water supply (3).

The wall (4) may be provided with a second opening (16) into which a part of the water supply (3) is introduced.
In this case, the second opening (16) is formed between the wall (4) and the current plate (1).
1b) is desirably provided in the vicinity of the joining position.

At this time, it is desirable that the second opening (16) is located in the third direction (-z-axis direction) opposite to the first direction (+ z-axis direction) with respect to the current plate (11b). Thereby, the stagnation of the water supply (3) is more effectively prevented.

The steam generator according to the present invention includes a heat transfer tube (6) for heating the feed water (3), a wall (4) extending in the first direction (z-axis direction), and a current plate (11b). . The water supply (3) moves in the first direction (+ z axis direction) as a whole by being heated (see FIG. 1). Rectifier plate (11
b) is joined to the wall (4). Rectifier plate (11b)
Changes the moving direction of the water supply (3) locally to a second direction (± x-axis direction) different from the first direction (+ z-axis direction). The wall (4) has a third opening (16) in which a part of the water supply (3) is introduced near a position where the wall (4) and the flow straightening plate (11b) are joined. Wall (4) and current plate (11b)
Water supply (3) tends to stagnate in the vicinity of the position where is joined. The provision of the third opening (16) prevents stagnation of the water supply (3).

At this time, it is desirable that the third opening (16) is located in the third direction (-z-axis direction) opposite to the first direction (+ z-axis direction) with respect to the current plate (11b). Thereby, the stagnation of the water supply (3) is more effectively prevented.

The steam generator according to the present invention comprises a cylindrical container (38), a heat transfer tube (6), a planar partition plate (10) for partitioning the inside of the container (38), and a flow straightening plate (31a, 31
b) (see FIGS. 5 and 6). The water supply (3) is stored inside the container (38). The heat transfer tube (6) passes through the inside of the container (38) and heats the water supply (3). The water supply (3) is heated to a first
In the direction (+ z axis direction). Rectifier plates (31a, 31
b) locally indicates the moving direction in which the water supply (3) moves;
Change to a second direction (± y-axis direction) different from the first direction. The second direction (± y-axis direction) is substantially perpendicular to the first direction (+ z-axis direction) and along the partition plate (10). In the steam generator, the water supply (3) flows in a direction along the partition plate (10) of the cylindrical container (38). As a result, the cross-flow region in which the heat transfer performance is improved increases as compared with the conventional example.

At this time, the rectifying plates (31a, 31b)
It may include a first current plate (31a) and a second current plate (31b). The first current plate (31a) has a first notch (34a) through which the water supply (3) passes, near one end in the diameter direction of the partition plate (10) (see FIG. 8). Further, a second notch (34b) through which the water supply (3) passes is provided near the other end in the diametric direction of the partition plate (10).
Having. Thereby, the water supply (3) flows in the direction along the partition plate (10) of the cylindrical container (38).

At this time, the rectifying plates (31a, 31b) may be provided with a first opening (not shown) through which a part of the water supply (3) passes in the first direction (+ z axis direction).

In this case, the rectifying plates (31a, 31b)
It may be joined to the inner surface of the container (38). At this time,
The first opening (not shown) is provided with a current plate (31a, 31).
It is desirable to be provided near the first position where b) and the container are joined.

The rectifying plates (31a, 31b) may be joined to the partition plate (10). The first opening (not shown) includes a current plate (31a, 31b) and a partition plate (10).
Are desirably provided in the vicinity of the second position where is joined.

The flow straightening plates (31a, 31b) may be joined to the inner surface of the container (38). The container (38) may be provided with a second opening (not shown) into which a part of the water supply (3) is introduced. The second opening (not shown) is desirably provided near the first position where the current plates (31a, 31b) and the container (4) are joined.

[0030] The steam generator according to the present invention comprises a plurality of heat transfer tubes (6) in contact with the feed water (3) and through which a high-temperature heating medium (9) higher than the feed water (3) passes; A flow straightening plate (41) penetrated by the heat transfer tube (6) is provided (see FIG. 9). The heat transfer tube (6) is a first heat transfer tube group (6b).
And a second heat transfer tube group (6a) having a shorter length in contact with the water supply (3) than the first heat transfer tube group (6b). Rectifier plate (4
1) has an opening (42) through which water is supplied near a position where the second heat transfer tube group (6a) penetrates the straightening plate.
In the steam generator, a large amount of water (3) contacts the second heat transfer tube group (6a) having a short length. Thereby, the heat exchange efficiency is enhanced.

At this time, the steam generator further includes a container (4) for accommodating the current plate (41) and the heat transfer tube (6);
The interior of the container (4) is divided into a first space (5a) and a second space (5).
b) and a partition plate (10) for partitioning the partition. At this time, the heat transfer tube (6) passes through both the first space (5a) and the second space (5b). Second heat transfer tube group (6
a) is closer to the partition plate (10) than the first heat transfer tube group (6b).

[0032]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A steam generator according to an embodiment of the present invention will be described.

First Embodiment FIG. 1 shows a vertical sectional structure of a steam generator according to a first embodiment. In FIG. 1, the x-axis, y-axis, and z-axis are set in the directions indicated by the reference numeral 50. FIG. 2 shows a horizontal sectional structure of the steam generator according to the first embodiment. In FIG. 2, the x-axis, the y-axis, and the z-axis are set in the directions indicated by the reference numeral 51.

The steam generator according to the first embodiment has a structure in which water supplied as steam when heated is hard to stagnate, thereby improving heat transfer efficiency.

The steam generator according to the first embodiment has an outer shell 1 as shown in FIG. The outer shell 1 is substantially cylindrical. The outer shell 1 is provided with a water supply inlet nozzle 2. Water supply 3 is supplied to the water supply inlet nozzle 2 from outside.

A wrapper 4 is provided along the inner surface of the outer shell 1. The water supply 3 supplied to the water supply inlet nozzle 2 is
It is introduced into the heat exchange area 5 through the space between the outer shell 1 and the wrapper 4.

A large number of heat transfer tubes 6 are provided in the heat exchange area 5. However, in FIG. 1, only one of the heat transfer tubes 6 is illustrated in a simplified manner to avoid complexity of the drawing. The heat transfer tube 6 is connected to an inlet water chamber 7 and an outlet water chamber 8. The inlet water chamber 7 is supplied with a high-temperature heating fluid 9 heated to a high temperature from a heat source such as a nuclear reactor. The high-temperature heating fluid 9 flows into the heat transfer tube 6 via the inlet water chamber 7 and flows through the outlet water chamber 8. The high-temperature heating fluid 9 that has reached the outlet water chamber 8 flows out of the steam generator from the outlet water chamber 8 and is returned to the above-described heat source.

The high temperature heating fluid 9 passing through the heat transfer tube 6
The heat is conducted to the feedwater 3 introduced into the heat exchange area 5. That is, the heat transfer tube 6 heats the feedwater 3. The feed water 3 is heated so as to be entirely above the steam generator, that is,
It flows in the + z-axis direction.

In order to increase the efficiency of transferring heat from the high temperature heating fluid 9 to the feed water 3, the heat exchange area 5 has a structure described below.

In the heat exchange area 5, a partition plate 10 is provided. As shown in FIG. 2, the partition plate 10 divides the heat exchange region 5 into a high-temperature region 5a and a low-temperature region 5b.

The high temperature side region 5a is a region in which a portion of the heat transfer tube 6 close to the inlet water chamber 7 is accommodated. on the other hand,
The low temperature side region 5b is a region in which a portion of the heat transfer tube 6 close to the outlet water chamber 8 is accommodated.

As shown in FIG. 1, the low-temperature side region 5
In b, straightening plates 11a and 11b are provided. The current plate 11a is joined to the partition plate 10 described above. The current plate 11b is joined to the wrapper 4 described above.

The flow regulating plate 11a changes the direction in which the feed water 3 that is about to flow above the steam generator flows, in a direction perpendicular to the partition plate 10 and toward the wrapper 4, that is, in the + x-axis direction. Similarly, the flow regulating plate 11b changes the direction in which the water supply 3 flows, in a direction perpendicular to the partition plate 10 and toward the partition plate 10, that is, in the −x-axis direction.

The rectifying plates 11a and the rectifying plates 11b are provided alternately. As a result, the feed water 3 in the low temperature side region 5b creates a flow in the horizontal direction of the steam generator,
The zigzag flow gradually upwards above the steam generator. In the low-temperature side region 5b, the efficiency of transferring heat from the high-temperature heating fluid 9 to the feed water 3 is increased by the feed water 3 flowing zigzag in this manner.

Openings 12a and 12b are provided in the rectifier plates 11a and 11b, respectively, to prevent stagnation of the water supply 3. The opening 12a is provided near a position where the current plate 11a and the partition plate 10 are joined. The opening 12b is provided near the position where the current plate 11b and the wrapper 4 are joined. By providing the opening 12a,
The water supply 3 is prevented from stagnating near the position where the current plate 11a and the partition plate 10 are joined. Further, the provision of the opening 12b prevents the water supply 3 from stagnating near the position where the rectifier plate 11b and the wrapper 4 are joined.
By preventing stagnation of the water supply 3, the high temperature heating fluid 9
The efficiency with which heat is transferred to the feed water 3 is increased.

FIG. 3 shows the structure of the current plate 11a. The current plate 11a has a semicircular shape. The flow straightening plate 11a is provided with a heat transfer tube opening 6a through which the heat transfer tube 6 passes. The current plate 11 a is joined to the partition plate 10 at the straight side 13. Further, near the side 13, the above-described opening 12a is provided. The opening 12a is provided between the current plate 11a and the partition plate 10a.
Are located near the position where they are joined.

FIG. 4 shows the structure of the current plate 11b. The current plate 11b has a semicircular shape provided with a semicircular notch. The current plate 11b is provided with a heat transfer tube opening 6b through which the heat transfer tube 6 passes. The current plate 11 b is joined to the wrapper 4 at a semicircular side 14. Rectifier plate 11b
Is joined to the partition plate 10 at the straight side 15. In the vicinity of the semicircular side 14, the above-described opening 12b is provided. The opening 12b is located near the position where the current plate 11b and the wrapper 4 are joined.

Further, as shown in FIG. 1, near the position where the wrapper 4 and the current plate 11b are joined, the wrapper 4 is further provided with an opening 16.
The opening 16 is located below the current plate 11b. A part of the water supply 3 flows through the opening 16. This allows
The water supply 3 is more difficult to stagnate.

The feed water 3 heated in the heat exchange region 5 having the above-described structure becomes a gas-liquid two-phase fluid 17 in which a gas phase and a liquid phase are mixed, and is supplied to a steam-water separator 18. Will be introduced. The steam separator 18 separates the gas-phase component and the liquid-phase component of the gas-liquid two-phase fluid 17 to generate wet steam 19 that is steam containing moisture. The wet steam 19 is supplied to the moisture separator 20.
Will be introduced. The moisture separator 20 removes moisture from the wet steam 19 to generate a dry steam 21. From the moisture separator 20, dry steam 21 is supplied to the outside of the steam generator.

In the steam generator of the first embodiment, the water supply 3 is less likely to stagnate in the low temperature side region 5b. Therefore, the efficiency of transferring heat from the high-temperature heating medium 9 to the feedwater 3 is high.

In the first embodiment, the opening 12
It is also possible that only the opening 16 is provided without providing a and 12b. It is also possible that the opening 16 is not provided and only the openings 12a and 12b are provided.

Further, an opening 16 into which a part of the water supply 3 flows.
May be located above the current plate 11b.
Even in this case, particularly when the openings 12a and 12b are not provided, the effect that the water supply 3 is hard to stagnate can be obtained. However, it is desirable that the opening 16 be located below the current plate 11b, since the effect that the water supply 3 is less likely to stagnate is higher.

Second Embodiment FIGS. 5 and 6 are cross-sectional views showing a vertical cross-sectional structure of a steam generator according to a second embodiment. In FIG. 5, the x-axis, the y-axis, and the z-axis are set in the directions indicated by the symbols 60, respectively. Similarly, in FIG. 6, the x-axis, the y-axis, and the z-axis are respectively taken in the directions indicated by the symbols 61. FIG. 7 is a cross-sectional view illustrating a horizontal cross-sectional structure of the steam generator according to the second embodiment. In FIG. 7, the x-axis, the y-axis, and the z-axis are respectively set in the directions indicated by the symbol 62.

The steam generator according to the second embodiment has a structure similar to that of the steam generator according to the first embodiment.

However, the shapes of the straightening plates 31a and 31b of the steam generator of the second embodiment are different from the shapes of the straightening plates 11a and 11b of the steam generator of the first embodiment. The rectifying plates 31a and 31b are devised so that the distance through which the feedwater passes through the heat exchange area is increased, and thus the heat exchange efficiency is increased.

The wrapper 38 of the steam generator of the second embodiment differs from the wrapper 4 of the first embodiment in that no opening is provided.

As shown in FIGS. 5 and 6, the steam generator according to the second embodiment includes an outer shell 1 and a water supply inlet nozzle 2 similarly to the steam generator according to the first embodiment. . Water supply 3 is supplied from the water supply inlet nozzle 2.

A wrapper 38 is provided along the inner surface of the outer shell 1. The feedwater 3 passes through the wrapper 38 and is introduced into the heat exchange area 5.

The steam generator according to the second embodiment further includes a heat transfer tube 6, an inlet water chamber 7, an outlet water chamber 8, a partition plate 10, a steam separator 18, and a moisture separator 20. The structures and functions of the heat transfer tube 6, the inlet water chamber 7, the outlet water chamber 8, the partition plate 10, the steam separator 18, and the moisture separator 20 are the same as those described in the first embodiment. Yes, and will not be described.

As shown in FIG. 5, rectifying plates 31a and 31b are provided in the low temperature region 5b. The current plates 31a and 31b are joined to the wrapper 38 and the partition plate 10. The flow straightening plates 31a and 31b change the direction in which the feed water 3 that flows toward the upper part of the steam generator flows,
Change to the horizontal direction of the steam generator. However, in the second embodiment, the direction in which the feed water 3 flows is a direction parallel to the partition plate 10 unlike the above-described known steam generator. When the direction in which the water supply 3 flows is parallel to the partition plate 10, the distance through which the water supply 3 passes through the heat exchange area 5 increases. That is, the cross flow region in which the heat transfer performance is improved increases.

FIG. 6 is a sectional view taken along the line DD 'in FIG. That is, FIG. 6 shows a cross-sectional structure of the steam generator according to the second embodiment in a cross section cut along a plane parallel to the partition plate 10. The current plate 31a changes the direction in which the feedwater 3 that is to flow upward (in the z-axis direction) of the steam generator flows in the + y-axis direction. The current plate 31b changes the direction in which the feed water 3 flows toward the upper part (z-axis direction) of the steam generator in the −y-axis direction. Current plate 31
a and the current plate 31b are provided alternately.

FIGS. 8A and 8B show the structures of the current plates 31a and 31b, respectively. In FIG. 8, the x axis, y
The axis and the z axis are set in the direction indicated by the symbol 63. The current plate 31a is joined to the partition plate 10 at the straight sides 32. Further, the current plate 31 a is joined to the wrapper 38 at the curved side 33. The current plate 31a has a notch 34a.
Having. Through the notch 34a, the feed water 3 passes above the steam generator. The current plate 31a further has a heat transfer tube opening 35a. The heat transfer tube opening 35a is an opening through which the heat transfer tube 6 passes.

The current plate 31b has the same structure as the current plate 31a. The rectifying plate 31b is formed of a partition plate 1 with a straight side 36.
0. Further, the current plate 31a has a curved side 3
At 7, it is joined to the wrapper 38. The current plate 31b has a cutout 34b, similarly to the current plate 31a. However,
The notch 34b is provided at a position opposite to the notch 34a provided on the current plate 31a. Current plate 31b
Has a heat transfer tube opening 35b. Heat transfer tube opening 35b
Is an opening through which the heat transfer tube 6 passes.

The rectifying plates 31a, 3a having such a structure
By providing 1b, the feed water 3 in the low temperature side region 5b gradually flows in a zigzag manner while creating a flow in the horizontal direction of the steam generator and in the direction parallel to the partition plate 10. It flows upwards of the steam generator. In the low-temperature side region 5b, the efficiency of transferring heat from the high-temperature heating fluid 9 to the feed water 3 is increased by the feed water 3 flowing zigzag in this manner.

At this time, in the steam generator according to the second embodiment, the distance through which the feed water 3 flows inside the low-temperature side region 5b is as follows.
It is made larger than that of the known steam generators described above, so that the efficiency of transferring heat is further increased.

In the above-described known steam generator, as shown in FIG. 11, the direction in which the water supply 103 flows is perpendicular to the partition plate 110. Also, as shown in FIG. 1, in the steam generator according to the first embodiment, similarly, the direction in which the water supply 3 flows is a direction perpendicular to the partition plate 10. In this case, the feedwater 3 will be flowed in the horizontal direction for a distance substantially equal to the radius of the steam generator.

On the other hand, in the second embodiment, the water supply 3
The direction of flow is parallel to the partition plate 10.
As a result, the feed water 3 is caused to flow in the horizontal direction of the steam generator by a distance substantially equal to the diameter of the steam generator. That is, in the second embodiment, the low-temperature side region 5b
The distance over which the feed water 3 flows is approximately twice as long as that of a known steam generator. Thereby, the heat conversion efficiency of the steam generator according to the second embodiment is higher than that of the known steam generator.

Incidentally, in the second embodiment, similarly to the first embodiment, it is possible to provide an opening for the water supply 3 to pass through the flow straightening plates 31a, 31b. Thereby, stagnation of the water supply 3 is prevented, and the heat conversion efficiency is further improved. The opening is desirably provided near a position where the current plates 31a and 31b are joined to the wrapper 38 and the partition plate 10.

Further, in the second embodiment, similarly to the first embodiment, the wrapper 38 may be provided with an opening through which the water 3 is introduced into the heat exchange area 5.
The opening is desirably located near the position where the current plates 31a, 31b and the wrapper 38 are joined. Also,
It is more desirable that the opening be located below the current plate 31a, 31b. Thereby, stagnation of the water supply 3 is further prevented, and the heat conversion efficiency is further improved.

Third Embodiment FIG. 9 shows a configuration of a steam generator according to a third embodiment. The configuration of the steam generator of the third embodiment is similar to the configurations of the steam generators of the first and second embodiments. However, the steam generator of the third embodiment is
The structure of the current plate 41 is different from the steam generators of the first and second embodiments.

As shown in FIG. 9, the steam generator according to the third embodiment comprises an outer shell 1, a water supply inlet nozzle 2, a wrapper 4, a heat transfer tube 6, an inlet water chamber 7, an outlet water chamber 8, Partition plate 1
0, a steam-water separator 18 and a moisture separator 20. The structures and functions of the outer shell 1, the water supply inlet nozzle 2, the wrapper 4, the heat transfer tubes 6, the inlet water chamber 7, the outlet water chamber 8, the partition plate 10, the steam separator 18, and the moisture separator 20 are implemented. Are the same as those described in the first embodiment. However, in FIG. 9, of the many heat transfer tubes 6, two heat transfer tubes 6 a provided near the partition plate 10 and a heat transfer tube 6 b provided away from the partition plate 10 are provided. A heat tube 6 is described. Further, similarly to the first embodiment, the heat exchange region 5 is separated into a high temperature side region 5a and a low temperature side region 5b by the partition plate 10.

The current plate 41 is provided in the low temperature region 5b. The current plate 41 is provided generally in the horizontal direction of the steam generator. An opening 42 is provided in the current plate 41. The opening 42 is located near the partition plate 10.

FIG. 10 shows the structure of the current plate 41. The current plate 41 is joined to the partition plate 10 at a straight side 43. Further, the current plate 41 is joined to the wrapper 4 at a semicircular side 44. The current plate 41 has a heat transfer tube opening 45. The heat transfer tube 6 passes through the inside of the heat transfer tube opening 45.

As described above, the current plate 41 further has the opening 42. The opening 42 is provided near the side 43. That is, the opening 42 is located near the partition plate 10.

The opening 4 is located near the partition plate 10.
With the provision of 2, the heat transfer tubes 6a provided near the partition plate 10 are in contact with more water supply 3 than the heat transfer tubes 6b provided away from the partition plate 10. This increases the heat exchange efficiency of the steam generator.

The reason is as follows. Partition plate 1
The length of the heat transfer tube 6 a provided near 0 is shorter than the length of the heat transfer tube 6 b provided apart from the partition plate 10. That is, the length of the heat transfer tube 6a in contact with the feed water 3 is shorter than that of the heat transfer tube 6b.

Accordingly, the temperature of the high-temperature heating medium 9a passing through the inside of the heat transfer tube 6a provided near the partition plate 10 is equal to the temperature of the high-temperature heating medium 9a passing through the inside of the heat transfer tube 6b provided away from the partition plate 10. The temperature becomes higher than the temperature of the heating medium 9b.

The heat is transferred to the water supply 3 more efficiently by bringing the heat transfer tube 6a, which becomes higher in temperature, into contact with a large amount of the water supply 3. As a result, the heat exchange efficiency of the steam generator increases.

As described above, the steam generator according to the third embodiment has a structure in which a large amount of the water supply 3 is in contact with the heat transfer tube 6a having a short length in contact with the water supply 3, thereby improving the heat exchange efficiency. Have been.

[0080]

According to the present invention, a steam generator having high heat exchange efficiency is provided.

[Brief description of the drawings]

FIG. 1 shows a structure of a vertical cross section of a steam generator according to a first embodiment.

FIG. 2 shows a structure of a cross section in a horizontal direction of the steam generator according to the first embodiment.

FIG. 3 shows a structure of a current plate 11a.

FIG. 4 shows the structure of a current plate 11b.

FIG. 5 shows a vertical cross-sectional structure of a steam generator according to a second embodiment.

FIG. 6 shows a structure of a vertical cross section of a steam generator according to a second embodiment.

FIG. 7 shows a horizontal cross-sectional structure of a steam generator according to a second embodiment.

FIG. 8 shows the structure of the current plates 31a and 31b.

FIG. 9 shows a structure of a steam generator according to a third embodiment.

FIG. 10 shows the structure of a current plate 41.

FIG. 11 shows the structure of a known steam generator.

[Explanation of symbols]

 1: Outer body 2: Water supply inlet nozzle 3: Water supply 4, 36: Wrapper 5: Heat exchange area 6: Heat transfer tube 7: Inlet water chamber 8: Outlet water chamber 9: High temperature heating fluid 10: Partition plate 11a, 11b, 31a , 31b, 41: Rectifier plate 12a, 12b, 16, 42: Opening 18: Steam separator 20: Moisture separator

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G21D 1/00 G21D 1/00 S (72) Inventor Toshiyuki Mizutani 1-chome, Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo Prefecture. No. 1-1 Inside the Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Fukuda Minami 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Prefecture F-term inside the Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. 3L103 AA19 AA37 BB01 CC02 CC18 DD06 DD19 DD62

Claims (14)

[Claims] 1. A heat transfer tube for heating feed water, wherein the feed water moves in the first direction as a whole by being heated, and the moving direction in which the feed water moves is locally changed to the first direction. A rectifying plate for changing the direction to a second direction different from the direction, wherein the rectifying plate is provided with a first opening through which a part of the supply water flows in the first direction. 2. The steam generator according to claim 1, further comprising a wall extending in the first direction, wherein the rectifying plate is joined to the wall, and wherein the first opening is rectified with the wall. A steam generator provided near the position where the plate is joined. 3. The steam generator according to claim 2, wherein the wall is provided with a second opening through which a part of the water supply is introduced, and the second opening is provided with a steam provided near the position. Generator. 4. The steam generator according to claim 3, wherein the second opening is located in a third direction opposite to the first direction with respect to the current plate. 5. A heat transfer tube for heating water supply, wherein the water supply is moved as a whole in a first direction by being heated, and a wall extending in the first direction; and a rectifying plate joined to the wall. The rectifying plate locally changes a moving direction in which the water supply moves to a second direction different from the first direction, and the wall is near a position where the wall and the rectifying plate are joined. A steam generator having a third opening into which a part of the feedwater is introduced. 6. The steam generator according to claim 5, wherein the third opening is located in a third direction opposite to the first direction with respect to the current plate. 7. A cylindrical container, wherein a water supply is stored inside the container, and a heat transfer tube passing through the container and heating the water supply, wherein the water supply is heated. By moving as a whole, it moves in the first direction, and a planar partition plate that partitions the inside of the container, and a moving direction in which the water supply moves is locally changed to a second direction different from the first direction. A steam generator, wherein the second direction is substantially perpendicular to the first direction and is a direction along the partition plate. 8. The steam generator according to claim 7, wherein the rectifying plate includes a first rectifying plate and a second rectifying plate, and the first rectifying plate is near one end of the partition plate in a diametric direction. A steam generator having a first notch through which the feedwater passes, and wherein the second straightening plate has a second notch through which the feedwater passes near the other end in the diameter direction of the partition plate. 9. The steam generator according to claim 7, wherein the straightening plate is provided with a first opening through which a part of the supply water flows in the first direction. 10. The steam generator according to claim 9, wherein the current plate is joined to an inner surface of the container, and the first opening is provided near a first position where the current plate and the container are joined. Steam generator. 11. The steam generator according to claim 9, wherein the straightening plate is joined to the partition plate, and the first opening is provided near a second position where the straightening plate and the partition plate are joined. Steam generator. 12. The steam generator according to claim 7, wherein the straightening plate is joined to an inner surface of the container, and the container is provided with a second opening through which a part of the water supply is introduced. The two openings are steam generators provided near a first position where the flow straightening plate and the container are joined. 13. A plurality of heat transfer tubes in contact with the water supply, and a rectifying plate through which the high-temperature heating medium higher than the water supply passes and inside the heat transfer tubes. The heat transfer tube includes: a first heat transfer tube group; and a second heat transfer tube group having a shorter length in contact with the water supply than the first heat transfer tube group. A steam generator having an opening through which the feedwater passes near a position where a group passes through the straightening vane. 14. The steam generator according to claim 13, further comprising: a container for storing the current plate and the heat transfer tube; and a partition plate for partitioning the inside of the container into a first space and a second space. The heat generator is a steam generator that passes through both the first space and the second space, and the second heat transfer tube group is closer to the partition plate than the first heat transfer tube group.