JPH06201889A - Marine reactor steam generator - Google Patents

Abstract

(57) [Abstract] [Purpose] Easy manufacturing and miniaturization. [Structure] A pair of support members 27, 28 extending in the radial direction 26 are attached to a plurality of outer circumferences of the inner cylinder 11, and a plurality of pipe support holes 31 in a row are provided between the pair of support members 27, 28 in a row. The ladder 32 is arranged, and the connecting member 39 is used to support the support member 27,
28, and the spiral evaporation pipe 42 is inserted through and supported by the plurality of ladders 32 in the circumferential direction 25. Next, the ladders 33 are arranged on the outer peripheral side of each ladder 32, and the supporting members 27 are connected by the connecting rods 39. , 28, and a spiral evaporation pipe 43 is inserted and supported between the ladders 33. Thereafter, similarly to the above, the ladders 34 are arranged on the outer peripheral side of the ladders 33, and the connecting rod 39 and the evaporation pipe 44 are arranged. Attached, outermost evaporation tube 4
The outer circumference of 4 is covered with an outer cylinder 12 to form a steam generator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator for a marine nuclear reactor.

[0002]

2. Description of the Related Art FIG. 3 shows an outline of a marine reactor 1, in which a primary cooling water 3 stored inside a reactor vessel 2 is shown.
Is lowered by the main cooling water pump 4 provided on the upper part of the reactor vessel 2 along the side part of the reactor vessel 2 as shown by the arrow, and then the inside of the tubular body 5 provided at the center part. And is heated by the heat generated from the core 6 when passing through the core 6 provided at the lower end of the tubular body 5 on the way, and at the same time, the reactor vessel 2 and the tubular body 5 are heated. When passing through the steam generator 7 provided between and, the water 8 supplied to the steam generator 7 removes heat and is cooled.
Steam 9 is generated by the steam generator 7.

In the figure, 10 is a reactor containment vessel.

As shown in FIG. 4, the steam generator 7 has a plate shape between the inner cylinder 11 and the outer cylinder 12 provided between the cylindrical body 5 and the reactor vessel 2. 2 has a structure in which a plurality of supporting members 13 are radially attached, and an evaporation pipe 14 which is spirally bent is inserted into and supported by the supporting member 13, and water 8 supplied from a water supply inlet 15 is downcomer pipe 16. After being led to the lower end of the evaporation pipe 14, the evaporation pipe 14 is vaporized while rising, and the vapor outlet 1 connected to the upper end of the evaporation pipe 14.
It is designed to be taken out as steam 9 from 7.

In FIG. 4, the evaporation tube 14 is illustrated as a single layer, but in reality, the evaporation tubes 14 having different diameters are multiply arranged on the support member 13.

The conventional steam generator 7 includes multiple evaporation tubes 1
In order to support 4, the tube support holes 18 and 19 for one row along the axial direction of the inner cylinder 11 as shown in FIG. 5 are multiply formed from the radially inner peripheral side to the outer peripheral side. The perforated plate method using the perforated plate 20 or rod-like ladders 21 and 22 having the tube support holes 18 and 19 for one row in the axial direction as shown in FIG. 6 are multiplexed from the radially inner side to the outer side. There is a ladder type in which the holes are arranged and bolted together, and the perforated plate type has a plurality of spirally bent different diameters in the tube support holes 18 and 19 of the perforated plate 20 attached to the inner cylinder 11. Are manufactured by sequentially screwing in the evaporation tubes 23 and 24 from the inner peripheral side. In the ladder type, the evaporation tubes 23 and 24 are installed by attaching the ladders 21 and 22 to the inner cylinder 11 for one row.
It is manufactured by repeating the operation of screwing in.

In FIGS. 5 and 6, for convenience, the inner cylinder 11 is drawn horizontally and the outer cylinder 12 is omitted.

[0008]

However, the above-mentioned conventional steam generator for a marine reactor has the following problems.

That is, in the perforated plate method using one perforated plate 20, since the positions of the tube support holes 18 and 19 are fixed, there is no escape when screwing in the evaporation tubes 23 and 24, and there is no escape. The friction between the evaporation pipes 23 and 24 and the pipe support holes 18 and 19 increases when the amount of mixing increases, and screwing in depends on the manufacturing accuracy of the evaporation pipes 23 and 24 and the pipe support holes 18 and 19. Can be impossible.

Further, since the single perforated plate 20 is large,
When screwing in the evaporation tubes 23, 24 having small diameters, the outer peripheral side portion of the perforated plate 20 becomes an obstacle, and the work is difficult.

On the other hand, in the ladder system, the evaporation tubes 23 and 24
Each time the screw is screwed in, new ladders 21 and 22 are fixed to the outer peripheral side with bolts, so there is a problem of the escape seen in the perforated plate method and a problem that the outer peripheral side part becomes an obstacle. Without (the bolts can be loosened, the positions of the ladders 21 and 22 can be slightly shifted, which can be used as a relief), and the workability is significantly improved.
Since the bolts 1 and 22 are bolted at an intermediate position between the pitches of the evaporation tubes 23 and 24, the pitch of the evaporation tubes 23 and 24 must be increased so as to prevent interference with the bolts. The size will be larger than the one.

In view of the above situation, it is an object of the present invention to provide a steam generator for a marine nuclear reactor which can be easily manufactured and can be downsized.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a pair of radially extending support members are spaced apart in the axial direction of the inner and outer cylinders at a plurality of circumferential positions between the inner cylinder and the outer cylinder arranged concentrically. Then, respectively, between each pair of support members, a plurality of rod-shaped ladders having a plurality of pipe support holes extending in the circumferential direction formed in a line in the axial direction are arranged in the radial direction,
The upper and lower ends of each of the ladders were fixed to the supporting member via a connecting rod, and a spiral evaporation pipe was supported through a pipe support hole between a plurality of ladders corresponding to the circumferential direction of each of the ladders. The present invention relates to a steam generator of a marine nuclear reactor.

[0014]

The operation of the present invention is as follows.

At a plurality of circumferential positions on the outer circumference of the inner cylinder,
A pair of support members extending in the radial direction are attached to the inner cylinder while being spaced apart from each other in the axial direction, and at a position between the support members of each pair,
A rod-shaped ladder having a plurality of pipe support holes extending in the circumferential direction and arranged in a line in the axial direction is provided for each, and the upper and lower ends of the ladder and the support member are fixed by a connecting rod. Then
A spiral evaporation pipe is inserted and supported between the ladders arranged in the circumferential direction.

When the evaporation tube is inserted and supported in the ladder,
Another ladder is arranged at a position on the outer peripheral side of each ladder, and the other ladder is fixed to a support member using a connecting rod, and a spiral evaporation pipe is inserted and supported between the corresponding other ladders.

Thereafter, in the same manner as described above, the ladder is arranged on the outer peripheral side, the evaporation pipes are attached, and when the evaporation pipes are attached to the outermost ladder, the outer periphery of each evaporation pipe is covered with the outer cylinder. , Complete the steam generator.

Thus, by using the ladder,
Since it is possible to work while moving the ladder, it is possible to easily screw in the evaporation tube, and by supporting the ladder on the support member, a bolt for directly fastening the ladder can be installed. Since it can be eliminated, the pitch of the evaporation pipe can be reduced to downsize the entire apparatus.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention.

A plurality of locations in the circumferential direction 25 between the inner cylinder 11 and the outer cylinder 12 extending in the vertical direction (for example, 3 to 4 locations or more locations may be provided. In FIG. 1, only one location is drawn. ), A pair of support members 27 and 28 extending in the radial direction 26 are attached at intervals in the axial direction 29 of the inner and outer cylinders 11 and 12, and the upper and lower surfaces of the support members 27 and 28 are arranged at equal pitches in the radial direction 26. A large number of bolt holes 30 are formed.

A plurality of vertically extending rod-shaped ladders 32, 33, 34 are arranged in contact with each other in the radial direction 26 at a position between each pair of support members 27, 28.
A plurality of pipe support holes 31 extending in the circumferential direction 25 are formed in 2, 33, and 34 in a line in the axial direction 29.

As shown in FIG. 2, the rudder 32, 33, 34 includes a ladder main body 36 having recesses 35 formed on the outer cylinder 12 side at an equal pitch, and a portion of the ladder main body 36 on the outer cylinder 12 side. It is constituted by a closing member 38 which abuts and both ends thereof are fixed by bolts 37 to close the recess 35 to form the pipe support hole 31.

A connecting rod 39 extending in the axial direction 29 is attached to the upper and lower ends of each of the ladders 32, 33 and 34, and the connecting rod 39 is passed through the bolt holes 30 formed in the supporting members 27 and 28. A fastener 41 such as a nut is fastened to a threaded portion 40 screwed into a portion of the connecting rod 39 that penetrates the bolt hole 30, and the ladders 32, 33, and 34 are supported by the support members 27 and 28.
Fixed to.

Ladder 32, 3 corresponding to the circumferential direction 25
The evaporation tubes 42, 43, 44 formed in a spiral shape are screwed into and supported by the tube support holes 31 of 3, 34.

Next, the operation will be described.

The process of heating the water flowing through the steam generator to generate steam by the primary cooling water circulated in the reactor is the same as in FIGS.

In the case of manufacturing the steam generator according to the present invention, first, the inner cylinder 11 may have a plurality of 25 circumferential locations (for example, 3 to 4 locations or more locations).
In FIG. 1, only one portion is drawn), and one end portion of the pair of support members 27 and 28 extending in the radial direction 26 is attached to the inner and outer cylinders 11 and 1.
The two are fixed at intervals in the axial direction 29.

Next, one of the rod-shaped ladders 32, 33, 34 is arranged at a position between each pair of support members 27, 28 and close to the inner cylinder 11, and the ladder 32 is vertically moved. The connecting rod 39 attached to the end is passed through one of the bolt holes 30 formed in the support members 27, 28 which is closest to the inner circumference,
By fastening a fixing tool 41 such as a nut to a threaded portion 40 threaded on a portion of the connecting rod 39 passing through the bolt hole 30,
The ladder 32 is fixed to the support members 27 and 28.

In this state, the evaporation pipe 42 which is bent in a spiral shape is screwed into the pipe support hole 31 of each ladder 32 corresponding to the circumferential direction 25 of the inner cylinder 11 or the evaporation pipe 4 is inserted.
Bend 2 in a spiral shape and screw in.

At this time, since the rudder 32 can be moved in the axial direction 29 by adjusting the fastening force of the fixing tool 41, the rudder 32 can be easily screwed in while moving in the axial direction 29. The evaporation tube 42 can be inserted, and when the screwing amount becomes large, the tube support hole 3 is rubbed by the friction between the evaporation tube 42 and the tube support hole 31.
1 damage to the surface, evaporation tube 42 and tube support hole 31
It is possible to prevent the screwing from becoming impossible when the manufacturing accuracy of the is not good.

Further, since there is no ladder 33, 34 on the outer cylinder 12 side when the evaporation tube 42 is screwed in, the work is easy.

Although the evaporation pipe 42 can be screwed into the rudder 32 more easily than in the case of FIG. 5, the rudder 32 has the rudder main body 36 and the closing member 38. Since only the ladder main body 36 is first supported between the support members 27 and 28, the evaporation pipe 42 is engaged with the recess 35 of the ladder main body 36, and the ladder main body 36 is attached to the outer cylinder 12 side. By bringing the closing member 38 into contact with and fixing it with the bolt 37, it becomes possible to attach the evaporation pipe 42 much more easily than in the above case.

After the work of inserting the evaporation pipe 42 into the first ladder 32 is completed, the outer cylinder 12 of the ladder 32 is finished.
The rudder 33 is disposed adjacent to the side portion, and the connecting rods 39 attached to the upper and lower ends of the rudder 33 are connected to the support member 2 as described above.
Threaded portion 4 threaded through the bolt hole 30 of the connecting rod 39, which penetrates through the adjacent bolt hole 30 formed in Nos. 7 and 28.
By fastening a fixture 41 such as a nut to 0, the ladder 32 is fixed to the support members 27 and 28, and thereafter, with respect to the pipe support hole 31 of the ladder 33 corresponding to the circumferential direction 25,
In the same manner as described above, the evaporation pipe 43 which is bent in a spiral shape in advance is screwed in, or the evaporation pipe 43 is screwed in while being spirally bent.

When the work of inserting the evaporation pipe 43 into the second ladder 33 is completed, the third ladder 34 is arranged adjacent to the portion of the ladder 33 on the outer cylinder 12 side, and the evaporation pipe 44 is screwed in. By repeating the above work, all the evaporation pipes are arranged, finally the outer cylinder 12 is fitted on the outer circumference of each evaporation pipe, and the other end portions of the support members 27 and 28 are attached to the outer cylinder 12. The steam generator is completed.

As described above, the support members 27, 28 are not directly fastened to each other by the ladders 32, 33, 34.
Each of the evaporation pipes 42,
A bolt or the like is not present at an intermediate position between the pitches of 43, 44, and the pitch of the evaporation tubes 42, 43, 44 can be reduced by that much, so that the entire apparatus can be downsized.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0038]

As described above, according to the steam generator for a marine nuclear reactor of the present invention, the excellent effect that it can be easily manufactured and downsized can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic partial perspective view of an embodiment of the present invention.

FIG. 2 is a side sectional view of the ladder shown in FIG. 1 with a part thereof omitted.

FIG. 3 is a principle diagram of a marine reactor.

FIG. 4 is a system diagram of the steam generator of FIG.

FIG. 5 is a schematic perspective view of a conventional perforated plate type steam generator.

FIG. 6 is a schematic perspective view of a conventional ladder-type steam generator.

[Explanation of symbols]

 11 inner cylinder 12 outer cylinder 25 circumferential direction 26 radial direction 27, 28 support member 29 axial direction 31 pipe support hole 32, 33, 34 ladder 39 connecting rod 42, 43, 44 evaporation pipe

Claims (1)

[Claims] 1. A pair of support members extending in the radial direction are attached to a plurality of circumferentially-arranged portions between the inner cylinder and the outer cylinder, which are concentrically arranged, and are separated from each other in the axial direction of the inner and outer cylinders, respectively.
Between each pair of support members, a rod-shaped ladder in which a plurality of pipe support holes extending in the circumferential direction are formed in a line in the axial direction,
A plurality of radial arrangements are provided, and the upper and lower end portions of each ladder are fixed to the support member via connecting rods, and pipe support holes are provided between a plurality of ladders corresponding to the circumferential direction of the ladders. A steam generator for a marine nuclear reactor, which is characterized by supporting a through spiral evaporation pipe.