JPS6078201A - Steam generating plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam generation plant, particularly a steam generation plant such as a fast breeder reactor that uses liquid metallic sodium as a coolant.

In conventional fast breeder reactors, metal (IJ) is
Because sodium becomes activated when irradiated with neutrons, the cooling system is generally divided into a primary system and a secondary system, and steam is generated using the heat of the non-activated sodium in the secondary system.

In Figure 1, (1) is a nuclear reactor, and the heat generated here is carried through the primary system piping (2) K to the intermediate heat exchanger (3), where it is converted to non-activated sodium in the secondary system. Transfer, 2
It is transmitted to the steam generator (5) through the next system piping (4), where steam is generated. (6) and (7) are primary system and secondary system circulation pumps, (8) is steam system piping, and (9) is a water supply pump. Intermediate heat exchanger (3) and steam generator (5)
) are installed independently and connected by piping (4). Since the temperature of the coolant in a fast breeder reactor is high, this piping (4) requires a long route to reduce thermal expansion stress, and the installation space for the steam generator (5) is also quite large. The problem was that it required a large amount of space, increasing the cost of both equipment and buildings.

The present invention was invented in order to deal with the above-mentioned problems, and its gist is that the shell-and-tube heat exchanger is arranged in the lower part and the steam generator is arranged in the upper part, and is formed integrally. , characterized in that the central downcomer pipe for extra-tubular fluid of the steam generator and the central downcomer pipe for extra-tubular fluid of the heat exchanger are aligned and connected, and a relative displacement absorbing structure is provided at the connecting part. located in a steam generation plant.

There is no need for long piping for transferring heat medium such as system coolant, and there is no need for swipes for installing the piping. Furthermore, since the space above the shell and tube heat exchanger can be used to install the steam generator, the installation space for the steam generator can also be saved. Therefore, the buildings that house these heat exchangers, steam generators, piping, etc. have also become smaller.
Steam generation plants can be made cheaper.

Hereinafter, five aspects of the present invention will be specifically explained with reference to an embodiment shown in FIG.

In Fig. 2, 01 is a shell-and-tube type intermediate heat exchanger for exchanging heat between the primary coolant and the secondary coolant, 01) is the heat exchanger tube of the heat exchanger al, (I
3, a3 is the tube sheet that supports the heat exchanger tube (lfl, Q4
)) The house is a downcomer. The primary coolant heated in the reactor flows from the top of the upper tube sheet a2 as shown by the white arrow, passes through the heat transfer tubes all, exits from under the lower tube sheet (131), and enters the reactor core. Return to .The secondary coolant, as shown by the black arrow 5, comes down the central downcomer pipe I from the steam generator holder, which is disposed above the heat exchanger a1 and formed integrally with it. °B A window opened at the bottom of the downcomer pipe Cl4) from the top of the barrel (II)
Go inside. Then, heat is exchanged with the primary coolant flowing inside the heat transfer tube αυ, and the upper steam generator c! IK is leaving. (21) is a heat exchanger tube bundle consisting of helical coil type heat exchanger tubes of the steam generator (a), and the tertiary side fluid, which is a steam system, flows through this heat exchanger tube. It is sent from a water supply pump (not shown). Coming quintic fluid (water)
Inflow from the nozzle (v4, downcomer chuzo e4
), it enters the heat transfer tube from below the heat transfer tube bundle Cυ, exchanges heat with the secondary coolant flowing outside the tube, becomes steam, flows out from the nozzle Q (and goes to the turbine (not shown). The secondary coolant coming out of the center hole (c) of the upper tube plate a2 rises in the riser tube (c), exits to the top of the heat transfer tube bundle 12υ, descends on the outside of the heat transfer tube, and It is reversed below the heat exchanger tube bundle 0211 and ascends the annular part formed by the shroud (C) and the body @, and reaches the secondary system circulation pump (not shown) from the outlet nozzle (C). Pressurized by the same pump. The secondary coolant flows into the downcomer pipe from the nozzle head, descends there, is aligned with the downcomer pipe, and is connected to it via the relative displacement absorbing structure. It flows into the downcomer pipe α. Therefore, the heat of the primary coolant is transferred to the secondary coolant flowing outside the tubes in the shell-and-tube heat exchanger, and this secondary coolant is placed in the upper part of the heat exchanger. Flow inside the pipe by flowing outside the steam generator pipe 3
The water is transmitted to the next fluid, and the water exits as steam.

In this way, the shell-and-tube heat exchanger 0 [and the steam generator (to) are integrated, and the central downcomer pipe (to) for the extra-tube fluid of the steam generator Tsukuda and the outer pipe for the extra-tube fluid of the heat exchanger section are integrated. Since the central downcomer pipes Q4) are aligned and connected, the long extra-tube fluid transport pipes that conventionally connected the heat exchanger and the steam generator are eliminated. In addition, the steam generator, which conventionally took up a considerable amount of space, fits into the space above the shell-and-tube heat exchanger, so
In addition to saving space and making it possible to significantly reduce the size of the reactor auxiliary building, it is also possible to reduce equipment costs by eliminating piping, and to reduce the capacity of equipment for transferring fluid outside the pipe.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figure 1 is a flow diagram of the heat medium in a conventional fast breeder reactor.
FIG. 2 is a schematic cross-sectional view showing one embodiment of the present invention. Shell-and-tube heat exchanger... (II, Steam generator... (A), Central downcomer pipe for fluid outside the steam generator...Fall, Central downcomer pipe for fluid outside the heat exchanger ...-C1
4), Relative displacement absorption structure...0]). Sub-agent Patent Attorney Shigefumi Okamoto and 3 others

Claims (1)

[Claims] A shell-and-tube heat exchanger is disposed in the lower part and a steam generator is disposed in the upper part to form an integral part, and a central downcomer pipe for the extra-tubular fluid of the steam generator and a central downcomer pipe for the extra-tubular fluid of the heat exchanger are provided. A steam generation plant characterized in that the downcomer pipes are aligned and connected, and a relative displacement absorbing structure is provided at the connection part.