JP3511531B2 - Steam generator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator, and more particularly to a center return steam generator used in, for example, a liquid metal cooled fast breeder reactor.

[0002]

2. Description of the Related Art A steam generator of a fast breeder reactor is a heat exchanger that heats water with liquid metal such as liquid metal sodium used as a coolant to obtain steam. This type of steam generator has a structure in which feed water flows in from a lower side portion of the main body barrel and steam heated by a heat transfer tube flows out from an upper side portion of the main body barrel. A helical coil type steam generator using a spiral heat transfer tube will be described with reference to FIG.

In a steam generator shown in FIG. 10, a shroud 5 is provided in a main body 4, an inner cylinder 6 is arranged in the shroud 5, and a helical coil 7 is arranged between the inner cylinder 6 and the shroud 5. A heat transfer tube is provided.

An upper mirror plate 4a is attached to the upper end of the main body cylinder 4, and a liquid metal inlet nozzle 12 is attached to the upper mirror plate 4a. A lower mirror plate 4b is attached to the lower end of the body barrel 4, and a liquid metal outlet nozzle 13 is attached to the lower mirror plate 4b.

Further, the main body 4 has a steam nozzle 10 on the upper side surface.
Are connected, and the water supply nozzle 1 is connected to the lower side surface. A steam pipe plate 9 is arranged on the steam pipe base 10, a water supply pipe plate 2 is arranged on the water supply pipe base 1, and a heat transfer pipe 3 is connected between the steam pipe plate 9 and the water supply pipe plate 2. The water supply flows into the water supply nozzle 1,
In the water supply tube plate 2, it is distributed to the plurality of heat transfer tubes 3. The heat transfer tube 3 is bent upward at the lower part of the main body cylinder 4 and reaches an annular region surrounded by the shroud 5 and the inner cylinder 6.

The heat transfer tube 3 in this region is bent in a spiral shape to form a helical coil heat transfer tube bundle 7, and the water in the heat transfer tube 3 becomes steam by heat exchange with an external liquid metal. The helical coil-shaped heat transfer tube bundle 7 is bent above the tube bundle portion to form a linear heat transfer tube bundle 8 and is connected to the steam tube sheet 9. The steam in the heat transfer tubes 3 flows into the steam tube base 10 from the steam tube plate 9 provided on the upper part of the main body cylinder 4, and flows out from the main body cylinder 4 to the outside.

On the other hand, the liquid metal is distributed from a ring header 11 provided above the body barrel 4 to a plurality of liquid metal inlet nozzles 12 and flows into the body barrel 4, and is surrounded by a shroud 5 and an inner cylinder 6. After the heat is exchanged with the water in the helical coil heat transfer tube bundle 7 while flowing down the region, it flows out from the body case 4 through the liquid metal outlet nozzle 13.

[0008]

The conventional steam generator has the following problems.
The liquid metal inlet nozzle 12 and the outlet nozzle 13 are connected to the upper part and the lower part of the main body cylinder 4, so that the water supply nozzle 1 and the steam nozzle 10 are separated from the liquid metal and the water / steam pipes. It is provided on the side. Therefore, with the increase of the body diameter due to the built-in electromagnetic pump and the increase of the body diameter and the height of the nozzle stub by the steam generator incorporating the double heat transfer tube, it is necessary to take a large space for installing the steam generator. Moreover, there is a problem that the maintenance space becomes insufficient.

The present invention has been made in order to solve the above problems, and reduces the installation space and maintenance space regardless of the type of steam generator, that is, the built-in single-tube or double-tube electromagnetic pump. It is to provide a steam generator that can sufficiently secure the above.

[0010]

Means for Solving the Problems The present invention of claim 1, upper
A main body cylinder whose both lower ends are closed by an upper end plate and a lower end plate, an inner cylinder arranged in the center of the main body cylinder, a helical coil heat transfer tube bundle arranged outside the inner cylinder, and a lower part of the main body cylinder. Of the helical coil-shaped heat transfer tube bundle provided on the end plate
The water supply tube base connected to the lower end and the upper end plate of the body barrel are connected to the upper end of the helical coil heat transfer tube bundle.
A steam pipe stand to be a liquid metal inlet nozzle provided in the upper portion of the front Stories body cylinder, the liquid metal is provided in an annular shape along the upper inner wall in the body cylinder communicating with the liquid metal inlet nozzle A flow rate distribution device for distributing the flow rate, and the helical coil-shaped heat transfer tube bundle and heat
Liquid that flows through the inner cylinder from the bottom to the top after replacement
A liquid metal outlet nozzle through which metal is introduced .

According to a second aspect of the present invention, an electromagnetic pump is arranged in the inner cylinder arranged at the center of the main body cylinder, and an outlet nozzle of the electromagnetic pump is connected to a liquid metal outlet nozzle provided in the main body cylinder and a connecting pipe. It is characterized in that it is connected via.

According to a third aspect of the present invention, the helical coil shape is provided.
Heat transfer tube bundle heat transfer tubeWhen,PreviousNoteWater stub and steam stubWhen
ToConsists of an inner cylinder and an outer cylinderTo become a double tube sheet structure
Characterize.

According to a fourth aspect of the present invention, a liquid metal induction metal member for guiding the liquid metal flowing down the helical coil heat transfer tube bundle into the inner cylinder is provided at the bottom of the main body cylinder .

According to a fifth aspect of the present invention, the flow rate distribution device has a rectangular or circular cross section and has a large number of holes below. According to a sixth aspect of the present invention, in the flow rate distribution device, the aperture ratios of the plurality of holes are changed in the circumferential direction so that the flow rate distribution of the liquid metal in the circumferential direction in the main body cylinder is made uniform. To do.

The invention of claim 7 is characterized in that the electromagnetic pump is suspended by a support flange provided on an upper portion of the main body barrel. The invention of claim 8 is
The diameter of the connecting pipe connecting the outlet nozzle of the electromagnetic pump is larger than the diameter of the outlet nozzle of the electromagnetic pump, or only the connecting portion is large, and the fitting portion of the electromagnetic pump outlet nozzle and the connecting pipe is sealed. It is characterized in that a ring for use is provided.

According to a ninth aspect of the present invention, a liquid metal drain pipe is built in the lower portion of the main body barrel, and the drain pipe is connected to an external pipe through a main body barrel from a nozzle provided above a support skirt. Is characterized by.

The invention according to claim 10 is characterized in that an external drain nozzle is connected to the bottom portion of the main body, an external drain pipe is connected to the external drain nozzle, and a protective cylinder is provided on the external drain pipe.

[0018]

According to the first, second, third and fourth aspects of the present invention, the liquid metal inlet nozzle and the outlet nozzle are provided at the side of the steam generator, and the water supply nozzle and the steam nozzle are provided at the bottom and the top of the steam generator. The liquid metal pipe and the water / steam pipe are separated because they are installed.

According to the present invention, in which the steam generator type is changed, the cylinder diameter is increased by incorporating the electromagnetic pump, and the cylinder diameter and the nozzle base are increased by using the double heat transfer tubes. Even if the length is increased, since there is little radial expansion, it is not necessary to change the arrangement of the liquid metal inlet nozzle, the outlet nozzle, the water supply nozzle and the steam nozzle.

Further, according to claims 1, 2, 3 and 4, since the ring header 11 and the inlet nozzle 12 for flowing the liquid metal into the steam generator are unnecessary, the upper structure of the steam generator is simple. In addition, it is possible to reduce the total height of the steam generator by providing the liquid metal flow rate distribution device inside the main body cylinder.

According to the fifth and sixth aspects, in addition to having the effect of rectifying the liquid metal, the flow rate can be evenly distributed in the circumferential direction in the steam generator. Since it is suspended in the cylindrical structure supported by, the electromagnetic pump can be pulled out.

In the eighth aspect, since the outlet nozzle of the electromagnetic pump and the connecting pipe are fitted together, it is easy to separate the electromagnetic pump and the cylindrical structure. In the ninth and tenth aspects, the liquid metal pipe and the water pipe are connected.・ Has work to separate steam piping.

[0023]

The first to fourth embodiments of the steam generator according to the present invention will be described with reference to the drawings. FIG. 1 shows the structure of a steam generator according to a first embodiment of the present invention. In the figure, the parts that are the same as or correspond to the conventional example
Description will be given using the same reference numerals as 10.

[0024] The steam generator according to the first embodiment, the upper end plate 4a and the lower end plate 4 b mainly been a vertically long cylindrical main body cylinder 4 closed by the upper and lower end portions, the body cylinder 4 is its side It is supported on the pedestal by a support skirt 21 provided on the section. A shroud 5 is arranged inside the main body 4, and an inner cylinder 6 is arranged at an internal center position of the shroud 5 along the axis.

A large number of heat transfer tubes 3 are wound in a helical coil around the inner cylinder 6 and arranged in layers to form a helical coil heat transfer tube bundle 7. Both ends of the helical coil-shaped heat transfer tube bundle 7 become a linear tube bundle 8 and are connected to the steam tube sheet 9 and the water supply tube sheet 2.

The steam pipe plate 9 and the water supply pipe plate 2 are fixed in the steam pipe base 10 and the water supply pipe pipe 2, respectively. The water supply nozzle 1 and the steam nozzle 10 are composed of an upper mirror 4a and a lower mirror 4b of the body barrel 4.
Installed on. Further, a liquid metal inlet nozzle 15 is provided on the upper outer surface of the main body cylinder 4, and a flow rate distribution device 16 for distributing the flow rate of the liquid metal is provided on the inner surface of the main body body 4 so as to face the inlet nozzle 15. An annular plate 17 is provided below the flow distribution device 16.

A liquid metal outlet communication pipe 19 is provided in the inner cylinder 6, and the liquid metal outlet communication pipe 19 is bent at a substantially right angle above the inner cylinder 6 and is provided on an upper portion of a side portion of the body barrel 4. Connected to the outlet nozzle 20. Lower end plate 4a in main body 4
A liquid metal induction metal fitting 18 for guiding the liquid metal flowing down between the helical coil heat transfer tube bundle 7 portion and the linear heat transfer tube bundle 8 into the inner cylinder 6 is provided on the upper side.

Next, the operation of the first embodiment will be described.
According to this embodiment, the water supply nozzle 1 and the steam nozzle 10 are connected to the main body 4
The liquid metal pipes are separated from the water / steam pipes by installing them on the upper mirror plate 4a and the lower mirror plate 4b, and by installing the liquid metal inlet / outlet nozzles 15 and 20 on the sides of the main body case 4.

Further, a liquid metal flow rate distribution device is provided in the body cylinder 4.
Since the 18 is provided, the ring header 11 and the liquid metal inlet nozzle 12 installed in the conventional example are not required, so that the overall height of the steam generator can be reduced. Further, by installing the steam nozzle and the water supply nozzle on the top and bottom of the main body 4, the space for installing the steam generator can be reduced.

Next, a second embodiment of the steam generator according to the present invention will be described with reference to FIG. This second embodiment is the first
An electromagnetic pump 22 is provided above the inner cylinder 6 in the embodiment of
The outlet nozzle 23 of the electromagnetic pump 22 is connected to the liquid metal outlet nozzle 20 via a connecting pipe 24. Since other configurations are similar to those of the first embodiment, detailed description will be omitted.

That is, in FIG. 2, the water supply nozzle 1 and the steam nozzle 10 are composed of a lower end plate 4b and an upper end plate 4a of the main body body 4.
It is provided in. A liquid metal inlet nozzle 15 and a flow rate distribution device 16 for distributing the flow rate of the liquid metal are provided on the outer surface and the inner surface of the side of the main body 4, and the flow rate distribution device is provided.
An annular plate 17 is provided below the unit 16.

An electromagnetic pump 22 is provided inside the inner cylinder 6,
The electromagnetic pump outlet nozzle 23 and the outlet nozzle 20 provided on the main body 4 are connected via a connecting pipe 24. Also,
A support flange 25 is provided on the upper part of the main body 4, and the electromagnetic pump 22 is connected to a flat plate 26 connected to the inner cylinder 6 with bolts (not shown) in the circumferential direction in a suspended state. .

Next, the operation of the second embodiment will be described.
According to the second embodiment, in addition to the same operation as that of the first embodiment, the electromagnetic pump 22 is connected to the support flange 25 with the bolt via the inner cylinder 6 and the flat plate 26.
If the electromagnetic pump 22 needs to be repaired, it can be easily pulled out from the main body cylinder 4.

Next, a third embodiment of the steam generator according to the present invention will be described with reference to FIG. In the steam generator according to the third embodiment, the shroud 5 is arranged inside the vertically long cylindrical body cylinder 4, the inner cylinder 6 is arranged at the center of the inside of the body cylinder 4, and the inner cylinder 6 is surrounded. A helical coil-shaped double heat transfer tube 27 using a double heat transfer tube composed of an inner tube and an outer tube is arranged in layers at a position to form a tube bundle.

The water supply nozzle 28 and the steam nozzle 31 are provided on the upper mirror plate 4a and the lower mirror plate 4b of the main body 4, respectively, and the water supply nozzle 28 and the lower liquid metal tube plate 30 are provided in the water supply nozzle 28. There is an upper liquid metal tube plate 32 inside the steam tube 31.
And a steam tube plate 33 is provided. A liquid metal inlet nozzle 15 and a flow rate distribution device 16 for distributing the flow rate of the liquid metal are provided on the upper part of the main body side portion.
An annular plate 17 is provided below.

Liquid metal outlet connecting pipe provided in the inner cylinder 6
19 is bent above the inner cylinder 6 and is connected to an outlet nozzle 20 provided at the upper part of the side of the body case 4. In addition, the lower end plate 4b in the main body body 4 has an induction metal member for guiding the liquid metal flowing down the helical coil heat transfer tube bundle 7 into the inner cylinder 6.
18 are provided.

Next, a fourth embodiment of the steam generator according to the present invention will be described with reference to FIG. In the steam generator according to the fourth embodiment, a shroud 5 is provided inside a vertically long cylindrical body case 4.
Is arranged, the inner cylinder 6 is arranged at the center of the inside of the main body 4, and a large number of helical coil-shaped double heat transfer tubes 28 composed of an inner pipe and an outer pipe are arranged in layers around the inner cylinder 6. It constitutes a tube bundle.

The water supply nozzle 28 and the steam nozzle 31 are provided at the top and bottom of the main body 4, respectively. Inside the water nozzle 28, a water supply tube plate 29 and a lower liquid metal tube plate 30 are provided. An upper liquid metal tube plate 32 and a steam tube plate 33 are provided in the steam tube base 31.

A liquid metal inlet nozzle 15 and a flow rate distribution device 16 for distributing the flow rate of the liquid metal are provided on the outer side surface and the inner side surface of the main body 4, and an annular plate 17 is provided below the flow rate distribution device 16. Is provided. Further, a liquid metal induction metal fitting 18 for guiding the liquid metal flowing down the helical coil tube bundle 7 into the inner cylinder 6 is provided at the bottom of the body barrel 4.

An electromagnetic pump 22 is provided in the cylinder 6, and an electromagnetic pump outlet nozzle 23 and an outlet nozzle provided in the main body 4 are provided.
20 is connected via a connecting pipe 24. Further, the electromagnetic pump 22 is provided with a support flange 25 on the top of the main body body 4 in a suspended state, and is connected to a flat plate 26 connected to the inner cylinder 6 with bolts (not shown) in the circumferential direction. .

The operation of the fourth embodiment will be described below.
According to the fourth embodiment, the same operation as that of the first embodiment can be obtained. Further, since the electromagnetic pump 22 is connected to the support flange 25 with the bolt via the inner cylinder 6 and the flat plate 26,
Even if the electromagnetic pump 22 needs to be repaired, it can be easily withdrawn from the steam generator.

Although the first to fourth embodiments of the steam generator according to the present invention have been described above, even when the type of the steam generator is changed from these embodiments, the water supply nozzle / steam nozzle and The liquid metal inlet / outlet nozzle installation location, center return method, and structure with a flow distribution device inside the main body remain unchanged.

Next, referring to FIGS. 5A and 5B, the first
The structure of the flow rate distribution device 16 described in the fourth to fourth embodiments will be specifically described. This flow distribution device 16
Flow path of the liquid metal inlet nozzle 15 connected to the outer surface of the main body 4
Donut-shaped cover plates 16a and 16b having a U-shaped vertical section are provided along the inner surface of the main body body 4 so as to be opposed to and communicate with 15a.

In the first example of FIG. 5A, the flow rate distribution device 16
The cross-sectional shape of the cover plate 16 (a) is rectangular, circular, or partially rounded, and the U-shaped cover plate
A large number of outflow holes 40 are provided at the bottoms of 16a and 16b. In the second example of FIG. 5B, the vertical cross section of the U-shaped cover plate 16b has a circular shape or a partially rounded shape, and has a large number of outflow holes 40 at the bottom. ing.

The outflow holes 40 are formed so that the vertical direction extends radially. An annular plate 17 for suppressing the downward flow of the liquid metal is provided on the inner surface of the main body body 4 below the distribution device 16.

Such first and second flow distribution devices
Since the ring header 11 and the liquid metal inlet nozzle 12 installed in the conventional example are not required as described in the first embodiment by providing 16 in the body barrel 4, the height of the steam generator is increased. It can be reduced.

An annular plate is provided below the flow distribution device 16.
By providing 17, the downward flow of the liquid metal can be prevented from directly hitting the tube bundle portion, and the liquid surface of the annulus portion sandwiched between the shroud 5 and the inner cylinder 6 in the main body cylinder 4 is stabilized, and the gas flow It can prevent entanglement.

FIG. 6 shows a third example of the flow distribution device 16. FIG. 6A is a vertical cross section of the third flow distribution device 16, and FIG. 6B shows the lower surface of FIG. 6A. Figure 6
The flow distribution device 16 of the third example in FIG.
Reference character c denotes the opening diameter of the outflow hole changed in the circumferential direction in order to make the flow rate distribution of the liquid metal in the main body cylinder 4 uniform.

That is, the liquid metal inlet nozzle of the cover plate 16
A small-diameter outflow hole 40a is formed on the left side close to 15, a medium-diameter outflow hole 40b is formed at the center, and an appropriate number of large-diameter outflow holes 40c are formed on the right side. Therefore, the flow rate distribution of the liquid metal does not deviate to a part within the annulus of the main body cylinder 4, and a uniform flow rate distribution can be obtained.

FIG. 7 is an enlarged view showing the fitted state of the electromagnetic pump outlet nozzle 23 and the liquid metal connecting pipe 24 in the second and fourth embodiments. That is, FIG. 7 (a)
Shows an example in which the diameter of the connecting pipe 24 provided in the inner cylinder 6 is the same as the diameter of the electromagnetic pump outlet nozzle 23, but only the fitting portion is expanded. In FIG. The diameter is made larger than that of the electromagnetic pump outlet nozzle 23. Then, each fitting portion is provided with a sealing ring 34 for preventing leakage of the liquid metal. Reference numeral 41 indicates a baffle plate.

According to FIGS. 7A and 7B, the electromagnetic pump
When the repair of 22 is required, it can be separated from the inner cylinder 6 without disconnecting the electromagnetic pump outlet nozzle portion 23 after being pulled out from the steam generator together with the inner cylinder 6.

FIG. 8 shows an example of a state in which the internal drain pipe 35 is attached in the vicinity of the lower end plate 4b in the body barrel 4. In FIG. 8, an internal drain pipe 35 mounted near the center of the bottom of the body barrel 4 traverses the heat transfer tube bundle and is bent upward inside the side of the body barrel 4 to rise between the shroud 5 and the body barrel 4. Then
A drain nozzle 36 connected above the support skirt 21 penetrates through the main body cylinder 4 and is connected to an external pipe. In addition,
The support skirt 21 is for connecting the main body cylinder 4 and fixing the steam generator to the pedestal.

By providing this internal drain pipe 35,
The liquid metal inlet nozzle 15 and the outlet nozzle 20 and the drain nozzle 36 are installed on the side of the body barrel 4, and
By installing the steam tube plates 9 and 33 on the top and bottom of the main body 4, the upper and lower liquid metal pipe tube plates 32 and 30, the water supply tube plates 2 and 29, and the steam tube plates 9 and 33 can be easily separated. it can.

FIG. 9 shows a state in which an external drain pipe 38 is attached instead of the internal drain pipe 35 in FIG. An external drain nozzle of liquid metal is provided on the lower end plate 4b of the bottom of the main body case 4.
An external drain pipe 38 is connected to the external drain nozzle 37. The external drain pipe 38 penetrates the lower end plate 4b of the body barrel 4 from the drain nozzle 37 and is connected to an external pipe (not shown). In addition, a protective cylinder 39 is provided around the outer drain pipe 38 near the water supply nozzle to prevent the liquid metal and water from being separated.

[0055]

According to the present invention, since the height of the steam generator is reduced, the space for installing the steam generator in the building can be reduced. In addition, since the liquid metal inlet / outlet nozzle is provided above the side of the main body of the main body, a sufficient maintenance space can be secured, which simplifies the vertical routing of the pipe and reduces the amount of liquid metal leakage. Will also be possible. As a result, it leads to downsizing of the building, so that the construction cost can be reduced and the economical efficiency of the fast breeder reactor plant can be improved.

Furthermore, since the water / steam pipe stubs are located above and below the main body barrel and the liquid metal inlet / outlet nozzles are located on the sides of the main body barrel, physical separation of the liquid metal pipe and the water / steam pipe is easy. Therefore, maintenance work becomes easy.

In the case of a steam generator having a built-in electromagnetic pump, in the unlikely event of failure of the electromagnetic pump, the electromagnetic pump can be pulled out without disconnecting the liquid metal pipes, improving the repairability and the time required for the repair. Is significantly improved.

The single tube steam generator, the electromagnetic pump built-in type steam generator, the double tube steam generator and the electromagnetic pump built-in double tube steam generator according to the present invention can be used in any type of liquid metal inlet, There is no need to change the layout of the outlet pipes, the water supply / steam nozzles, and the center return method, and the same effect can be obtained.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a steam generator according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the steam generator according to the present invention.

FIG. 3 is a vertical sectional view showing a third embodiment of the steam generator according to the present invention.

FIG. 4 is a vertical sectional view showing a fourth embodiment of the steam generator according to the present invention.

FIG. 5A is a vertical cross-sectional view showing only one side of a first example of the flow rate distribution device in the first to fourth examples.
FIG. 6A is a vertical cross-sectional view showing the second example in FIG.

FIG. 6A is a vertical cross-sectional view showing a third example of the flow rate distribution device, and FIG. 6B is a bottom view of FIG. 6A.

7A is a cross-sectional view showing a first example of the connection relationship between the liquid metal outlet nozzle of the steam generator according to the present invention, the electromagnetic pump outlet nozzle, and the connecting pipe, and FIG. 7B is a sectional view of FIG. Sectional drawing which shows the 2nd example.

FIG. 8 is a vertical cross-sectional view showing a mounted state of the internal drain pipe of the steam generator according to the present invention.

FIG. 9 is a vertical cross-sectional view showing a mounted state of an external drain pipe of the steam generator according to the present invention.

FIG. 10A is a vertical cross-sectional view partially schematically showing a conventional steam generator, and FIG. 10B is a top view of FIG. 10A.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water supply pipe stand, 2 ... Water supply pipe plate, 3 ... Heat transfer tube, 4 ... Main body cylinder 4a ... Upper end plate, 4b ... Lower end plate, 5 ... Shroud, 6
... Inner cylinder, 7 ... Helical coil heat transfer tube bundle, 8 ... Linear heat transfer tube bundle, 9 ... Steam tube plate, 10 ... Steam tube stand, 11 ... Ring header, 12 ... Liquid metal inlet nozzle (conventional), 13 ... Liquid metal outlet nozzle (conventional), 14 ... Skirt, 15 ... Liquid metal inlet nozzle (present invention), 16 ... Flow distribution device, 17 ... Annular plate, 18 ...
Liquid metal induction hardware, 19 ... Liquid metal outlet connecting pipe, 20 ... Liquid metal outlet nozzle (present invention), 21 ... Support skirt, 22 ... Electromagnetic pump, 23 ... Electromagnetic pump outlet nozzle, 24 ... Connecting pipe, 25
... Support flange, 26 ... Flat plate, 27 ... Double heat transfer tube, 28 ... Water supply pipe stand, 29 ... Water supply pipe plate, 30 ... Lower liquid metal pipe plate, 31 ... Steam pipe stand, 32 ... Upper liquid metal pipe plate, 33 … Steam tube plate, 34… Seal ring, 35… Internal drain pipe, 36… Drain nozzle, 37
… External drain nozzle, 38… External drain pipe, 39… Protective cylinder,
40 ... Outflow hole, 41 ... Baffle plate.

Continuation of the front page (56) Reference JP-A-1-28401 (JP, A) JP-A-2-190796 (JP, A) JP-A-52-22601 (JP, A) JP-A-61-225501 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F22B 1/06 G21C 1/02

Claims (10)

(57) [Claims] And 1. A body top and bottom ends are closed by the upper end plate and the lower end plate cylinder, the inner cylinder placed in the center of the body trunk, a helical coil-shaped heat exchanger tube bundle arranged outside of the inner tube The helical coil provided on the lower end plate of the main body
The water supply tube base connected to the lower end of the bundle of heat transfer tubes, and the helical coil heat transfer tube provided on the upper end plate of the body barrel.
A steam pipe stand that is connected to the upper end of the bundle, provided the liquid metal inlet nozzle provided in the upper portion of the front Stories body torso, annularly along the upper inner wall in the body cylinder communicating with the liquid metal inlet nozzle A flow rate distribution device for distributing the flow rate of the liquid metal, and the helical coil provided on the upper side surface of the body barrel.
After exchanging heat with the bundle of heat transfer tubes,
Liquid metal outlet nozzle that guides the liquid metal flowing upward
And a steam generator. 2. The steam generator according to claim 1, wherein an electromagnetic pump is arranged in the inner cylinder, and an outlet nozzle of the electromagnetic pump is connected to the liquid metal outlet nozzle via a connecting pipe. 3. A heat transfer tube of the helical coil heat transfer tube bundle.
When the before and Symbol feed water pipe block and the steam pipe base, the inner cylinder and the outer cylinder
2. A double tube sheet structure according to claim 1, wherein
The steam generator described. 4. A liquid metal induction metal member for guiding the liquid metal flowing down the helical coil heat transfer tube bundle into the inner cylinder is provided at the bottom of the main body cylinder.
The steam generator described. 5. The steam generator according to claim 1, wherein the flow distribution device has a rectangular or circular cross-sectional shape and has a plurality of outflow holes below. 6. The flow rate distribution device is characterized in that the opening ratio of the plurality of outflow holes is changed in the circumferential direction so that the flow rate distribution of the liquid metal in the circumferential direction inside the main body cylinder is made uniform. The steam generator according to claim 5 . 7. The electromagnetic pump is provided on an upper portion of the body barrel.
The steam generator according to claim 2 , wherein the steam generator is suspended by a support flange provided . 8. The diameter of the connecting pipe connecting the outlet nozzle of the electromagnetic pump is larger than the diameter of the outlet nozzle of the electromagnetic pump, or only the connecting portion is larger, and the connecting outlet of the electromagnetic pump outlet nozzle and the connecting pipe is The steam generator according to claim 2 , wherein a sealing ring is provided at the fitting portion. 9. An internal drain pipe is provided in the vicinity of a lower portion inside the main body barrel, and a drain nozzle that penetrates the main body barrel and is led out to the outside is connected to the internal drain pipe. 1. The steam generator according to 1. 10. An external drain nozzle is connected to a lower surface of a lower end plate of the body barrel, an external drain pipe is connected to the external drain nozzle, and a protective cylinder is provided on the external drain pipe. The steam generator described.