JP3143642B2 - Water discharge generator for nuclear power plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water discharge power generation device for a nuclear power plant, and more particularly, to water discharge energy generated when hot sea water discharged after cooling by power plant equipment of a seaside nuclear power plant is discharged to a water discharge pit. The present invention relates to a water discharge power generation device for recovering water by power generation and preventing generation of bubbles at the time of discharge into a water discharge pit.

[0002]

2. Description of the Related Art In a seaside nuclear power plant, seawater pumped from the sea by a fixed amount pump is used as a cooling medium for a diesel generator of a power plant, a cooling system for a primary auxiliary machine, or a condenser for turbine steam. The seawater that has been heat-exchanged for cooling is discharged from the plant equipment as warm wastewater to the water discharge pit, temporarily retained in the water discharge pit, and then discharged into the sea. The flow rate of warm seawater discharged from such a plant to the water discharge pit may reach as much as one hundred and several tens t / min, depending on the capacity of the plant, and the head at the water discharge port to the water discharge pit is about 7 m. To the extent.

In a conventional general seaside nuclear power plant, the discharged water energy of warm seawater used for cooling such plant equipment and discharged into a discharge pit is not only discarded without being used but also used. Due to this water discharge energy, when the warm seawater is discharged onto the water surface in the water discharge pit, air is entrained to generate bubbles, and the water surface of the water discharge pit is covered with a large amount of bubbles. Warm seawater discharged from the plant into the water discharge pit is discharged from the water discharge pit to the sea, and at this time, bubbles also flow out to the sea, and a large amount of bubbles float on the sea surface.

[0004] The foam on the sea surface thus formed is:
Originally, it is clean, harmless and free of contaminants, and disappears naturally over time.Bubble on the sea surface absorbs water scale and atmospheric dust as it drifts, making it seemingly dirty. It may take a long time before it naturally disappears, so if it spreads far offshore in a stream, it will pollute a wide range of sea surface and cause misunderstanding of marine pollution. there were.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a water discharge power generation device for a nuclear power plant, which can recover the head energy of hot seawater as electric power when discharged from a plant to a water discharge pit and at the same time prevent the generation of bubbles. It is intended to provide.

[0006]

In order to achieve the above-mentioned object, a water discharge power generator for a nuclear power plant according to the present invention is cooled by a plant equipment of a seaside nuclear power plant and discharged from a water discharge port to a water discharge pit. A gutter container that takes in the coming warm seawater from the upper surface by overflow at the front of the outlet,
An underwater turbine generator that receives hot seawater introduced into the gutter container as a falling flow and generates power by the head energy of the falling flow before flowing out to the water discharge pit; and a part of the hot seawater introduced into the gutter container And a bubble generation prevention unit that supplies side components in the downflow direction while shunting down the water to consume the head energy and then flow into the water discharge pit.

[0007]

The water discharge power generator for a nuclear power plant according to the present invention
It is configured to receive the head energy of warm seawater discharged after cooling by the plant equipment of the Rinkai Nuclear Power Station. That is, the warm seawater from the plant is discharged from the water discharge port to the water discharge pit, and a gutter container for taking in the warm seawater from the upper surface by overflow is provided in front of the water discharge port. The warm seawater taken into the gutter vessel is supplied as a falling flow to the underwater turbine generator, and the turbine generator generates power by the head energy of the falling flow before flowing out to the water discharge pit. The gutter container is also provided with a bubble generation prevention unit.This unit has, for example, a spiral flow path formed therein, and divides a portion of the warm seawater taken into the gutter container to flow down while flowing down. The side component is given to consume the head energy before flowing into the water discharge pit.

As described above, in the water discharge power generator for a nuclear power plant of the present invention, the head energy of hot seawater can be recovered as electric power by the power generation by the underwater turbine generator, and the head energy not used for power generation is generated by the bubble generation. The warm seawater is calmed at the time of entering the water discharge pit because it is consumed by the prevention unit, so that the generation of bubbles on the water surface of the water discharge pit is also avoided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view of the configuration of a main part of a water discharge power generation device for a nuclear power plant according to an embodiment of the present invention as viewed from inside a water discharge pit. , FIG. 2 is a plan view thereof.

In the water discharge pit 12, used hot seawater is discharged from a discharge pipe 11 from a power plant (not shown) to a limited width D at a corner of the pit at a bottom surface higher than the bottom surface of the pit.
A water discharge power generation device 10 according to the present embodiment is installed on a front surface of the water discharge port 13 so as to be supported by a mount 20 so as to separate the water discharge port 13 from a pit. The width D of the water outlet is selected to be about 6 to 7 m in a general water discharge pit of this kind.

The hot seawater discharged from the discharge pipe 11 to the water discharge port 13 flows into the water discharge pit from the lower part of the water discharge power generation device 10 after the head energy is consumed by the water discharge power generation device 10, and once stays there, It is discharged to the sea via a water discharge channel not shown.

The water discharge power generator 10 mainly includes a gutter container 14, a turbine pipe 15, a bubble generation preventing unit 16, and an underwater turbine generator 17 installed below the turbine pipe 15. The warm seawater discharged to the water outlet 13 is configured to overflow from the upper opening edge 18 and to be taken into the inside.

The gutter container 14 communicates with the upper part of the turbine pipe 15, and the bottom plate 19 of the gutter container 14 is inclined so that the turbine pipe 15 side is lowered. The inclined upper portion of the bottom plate 19 opens to the upper entrance of the bubble generation preventing unit 16, and a part of the warm seawater flows into the unit 16 from here. The bottom plate 19 is detachable, and when installed, serves to introduce warm seawater into the turbine pipe 15 and covers some spiral flow paths of the bubble generation prevention unit 16 below it to distribute the flow rate to both. It fulfills a defined function and thus makes it possible to change the flow distribution by replacing the bottom plate 19 with one of a different size.

An underwater turbine generator 17 is provided below the turbine pipe 15, and hot seawater passing through the generator 17 flows out of the gantry 20 into the water discharge pit 12. An upper end of the turbine pipe 15 can be opened, and a metal fitting 23 for fixing a lifting wire 22 connected to the generator 17 is fixed to an upper opening edge.

The foam generation preventing unit 16 is formed into a plurality of spiral flow paths by a molding plate 21 and gives a side component in a streamline direction of warm seawater flowing from an upper part of the unit to form a spiral. It is to be a streamline. The lower part of the unit 16 communicates with the water discharge pit 12. In FIG. 1, the symbol S indicates the water surface position of the water discharge pit 12, and the upper surface opening edge 18 of the gutter container 14 and the water discharge pit 1
In general, the head H with respect to the water level S of 2 can be about 6 to 7 m.

In the apparatus of this embodiment, the warm seawater that has flowed into the gutter vessel 14 from the water outlet 13 through the opening edge 18 due to the overflow flows into the turbine pipe 15 due to the inclination of the bottom plate 19 of the gutter vessel, and on the other hand. Then, a part flows into the bubble generation preventing unit 16. In this case, by setting the upper inlet of the turbine pipe 15 to a predetermined diameter in advance at a position where the entire opening is always immersed below the water surface, the upper inlet overflows from the upper opening edge 18 of the gutter container 14. Even if the flow rate fluctuates, the inflow amount into the turbine pipe 15 can always be set to a certain constant flow rate,
The amount of power generated by the underwater turbine generator 17 can be stably maintained.

The warm seawater flowing into the turbine pipe 15 is
The water flows downward and enters the underwater turbine generator 17 to drive the generator 17. Thereby, the head energy of the warm seawater flowing into the turbine pipe 15 is recovered as electric power. The warm seawater leaving the generator 17 flows into the water discharge pit 12 as a calmed flow in which most of the head energy is consumed for power generation. In this case, for example, the head H
Is 6.5 m and the flow rate to the turbine generator 17 is 2 t /
Assuming sec (the flow rate from the water outlet 13 is larger than this), power generation of about 100 kWe can be expected.

Of the warm seawater that has flowed into the gutter container 14, the excess flow for power generation flows into the bubble generation prevention unit 16. The warm seawater flowing into the unit 16 is spirally flown by the spiral flow path while flowing down the inside, and the head movement is consumed by the spiral movement without generating bubbles. Therefore, the warm seawater coming out from the lower part of the bubble derivation prevention unit 16 also flows into the water discharge pit 12 as a calmed flow in which most of the head energy is consumed in the spiral movement.

In maintenance of the underwater turbine generator 17, first, the bottom plate 19 of the gutter container 14 is removed to stop the flow of warm seawater into the turbine pipe 15, and then the wire 22 is removed from the metal fitting 23, and the power is generated by the wire 22. Machine 17 is lifted, and the generator 17
To the outside. When the maintenance is completed, the reverse operation is performed to return the generator 17 to the inside of the turbine pipe 15 and the bottom plate 19
However, since the entire amount of warm seawater flows into the foam derivation prevention unit 16 during this time, the risk of foam generation during maintenance work is avoided.

In the above embodiment, an example in which the water discharge power generation device of the present invention is most simply described has been described. However, it goes without saying that the water discharge power generation device of the present invention can be variously modified. .

[0021]

As described above, according to the present invention,
The head energy of the warm seawater discharged into the water discharge pit can be effectively recovered as electric power, the generation of bubbles in the water discharge pit can be avoided, and the existing water discharge pit can be installed with slight modification. .

[Brief description of the drawings]

FIG. 1 is a schematic front view of the configuration of a main part of a water discharge power generation device for a nuclear power plant according to one embodiment of the present invention, as viewed from the inside of a water discharge pit.

FIG. 2 is a plan view of the apparatus of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 water discharge power generation device 11 discharge pipe 12 water discharge pit 13 water discharge port 14 gutter vessel 15 turbine pipe 16 bubble generation prevention unit 17 underwater turbine generator 18 top opening edge 19 bottom plate 20 gantry 21 molded plate 22 wire 23 metal fitting

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiko Usui 1-6-107 Kita Toyonaka-cho, Izumiotsu-shi, Osaka (56) References JP-A-3-245088 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G21D 1/00 E02B 8/06

Claims (1)

(57) [Claims] 1. A gutter container which cools down with plant equipment of a seaside nuclear power plant and takes in warm seawater discharged from a water outlet into a water discharge pit from an upper surface by overflow at a front surface of the water outlet, and is incorporated into the gutter container. An underwater turbine generator that receives the warm seawater as a falling flow and generates power by the head energy of the falling flow before flowing out to the water discharge pit, and divides and flows down a portion of the warm seawater introduced into the gutter container. A water discharge power generation device for a nuclear power plant, comprising: a bubble generation preventing unit that supplies a side component in a flow direction in the downflow direction to consume head energy before flowing into the water discharge pit.