JP3198269B2 - Power plant water intake and discharge facilities - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seawater pump installed in a power plant, a turbine building, a water intake channel for supplying seawater necessary for cooling and condensing steam after driving a turbine, and a discharge passage for discharging the seawater. The present invention relates to a power plant intake / discharge facility which belongs to a technical field related to the installation of a waterway structure, and is particularly suitable for a reduction in the amount of outdoor facilities, a compact turbine building, and a water discharge / discharge facility arrangement in a power station having sea areas on the front and rear sides.

[0002]

2. Description of the Related Art A power plant water intake and discharge facility is an important structure for securing a stable supply of cooling water in terms of its function, and is a major civil engineering structure that requires huge construction costs economically. is there. Therefore, when designing these water intake and discharge facilities, it is necessary to give sufficient consideration from various viewpoints in addition to various conditions on the location.

[0003] The layout of the entire power plant is based on the shape of the site,
It has been determined by considering various ground conditions surrounding the power plant, including the ground conditions (level, bearing capacity, etc.) that support the building and various facilities, peripheral conditions, sea area conditions, and the like.

[0004] A typical example of a water intake and discharge route is shown in "Design of civil engineering structure of thermal power plant" (edited by Japan Society of Electric Power Engineers). In the case of thermal power plants, in general, the boiler building is set to the sea side and the turbine building is set to the land side because the heavy oil and crude oil tanks are set up on the sea side, while the nuclear power plant has the reactor building. In many cases, a turbine building is installed on the sea side because the rock to be supported is relatively shallow on the mountain side and the water discharge is relatively short.

[0005] Although there are some differences depending on the conditions of the power plant, this water intake / discharge facility is systematically an intake port → a screen room → an intake channel → a pump room → a pipeline → a condenser → a pipeline → a drainage channel → It is the route of the outlet.

[0006] In any of the power generation systems, the main building (particularly, the turbine building) and the water intake / discharge facility are closely related and have a great effect on the entire plot plan.

For reference, FIG. 6 shows an example of a plot plan in a nuclear power plant. Fig. 6 shows the “Nuclear Lecture (Overall Plan and Auxiliary Equipment)” edited by the Thermal and Nuclear Power Technology Association
1 shows an example of the arrangement of a BWR-type power plant.

As shown in FIG. 6, in the power plant, the main building is installed in the order of the seawater pump building 4, the turbine building 1, and the reactor building 12 from the sea side in the harbor, and a total of four power plants have. Seawater is supplied from a seawater pump in a seawater pump building 4 provided at the seawall in the harbor through a pipeline to supply seawater to a condenser in the turbine building 1, and seawater cooled in steam passes through a discharge pipe to the seawater pump building. 4 and the turbine building 1 discharge two sets of seawater to the south and north, respectively.

[0009] Thus, the total length of about 1K is only for the tailrace.
m, and the intake and discharge pipes are structures through which about 90 m ³ / s of seawater flows per plant.

On the other hand, the intake pipe and the water discharge pipe for guiding seawater into the turbine building 1 take a path that intersects at the lower part of the condenser in the turbine building 1 due to the system.

An invention aimed at reducing the amount of excavation in the lower part of the turbine building 1 due to this intersection is disclosed in Japanese Patent Application Laid-Open No. 7-189300.
There is an official gazette. In the present invention, the amount of digging of the turbine building is reduced by supplying seawater to the condenser without intersecting the intake pipe and the discharge pipe with the system configuration of the circulating water as two lines, as described above. It has not been achieved until the enormous reduction of the amount of civil works and the removal of restrictions including the installation location of the main building with water intake and discharge facilities, that is, the reduction of the power plant space factor due to the installation of water intake and discharge facilities.

[0012]

In recent years, site conditions for power plants have become increasingly severe, such as the location of narrow sites and landfill sites are being planned due to difficulties in the location of power plants.

Therefore, in the conventional power station location system, the area occupied by the water intake and discharge facilities on the power station site is large.
Under recent site conditions, the power plant plot plan flexibility is hindered, and the huge amount of civil engineering materials makes it impossible to meet the demand for improved economic efficiency.

Further, in recent years, there has been a tendency to install a larger number of power plants in a limited site due to the difficulty of acquiring land, and to simplify the water intake and discharge facilities, improve the economic efficiency by making the system compact, and arrange the power plant buildings. Positional freedom is becoming a more important issue.

[0015]

In order to solve the above-mentioned problems, a first aspect of the present invention is a seawater pump building for housing a seawater pump for drawing seawater from a sea area, a steam turbine, a generator, and the steam turbine. A condenser for cooling the steam exhausted from the seawater with seawater and condensing it, and a discharge passage for taking in seawater from the seawater pump building and a discharge for discharging used seawater from the condenser to the sea area. A plurality of turbine buildings provided with waterways, and a power plant having the seawater pump building and the plurality of turbine buildings installed in series in a turbine / generator axial direction. Features.

According to a second aspect of the present invention, in the first aspect, the seawater pump building is installed so as to take in seawater from a sea area in front of the turbine / generator in the axial direction. An intake channel and a water discharge channel are arranged below the turbine building or in the turbine building in the turbine / generator axis direction, and seawater is discharged into the sea area on the rear side of the turbine building on the opposite side of the intake from the turbine / generator axis direction. It is characterized by a power station water intake and discharge facility designed to be used.

According to a third aspect of the present invention, there is provided a seawater pump connected to a condenser inside a turbine building on an intake side of a plurality of turbine buildings. And a seawater pump connected to a turbine building located closer to the water discharge side of the plurality of turbine buildings, which is sequentially disposed outside the seawater pump.

According to a fourth aspect of the present invention, in order to solve the above-mentioned problems, in any one of the first to third aspects, the intake-side sea area of the seawater pump building and the discharge-side sea area of the turbine building each have an intake channel. And a water intake and discharge facility at a power station, which is a sea waterway provided crossing the water discharge channel.

[0019]

By installing a seawater pump adjacent to the turbine / generator axis direction of the turbine building, the length of the intake pipe from the seawater pump to the condenser is reduced. The intake pipe can pass seawater to the condenser of each unit without crossing in the turbine building. The water discharge pipe for passing the seawater after cooling the steam can guide the seawater to the water discharge channel without crossing. As a result, the intake pipe and the water discharge pipe are laid flat in the turbine building or in the turbine building base, and the building / civil equipment does not increase. In addition, the intake and discharge pipes from the seawater pump, which were conventionally installed outdoors, are installed in the turbine building, making the power plant more compact and reducing the amount of civil engineering equipment (intake and discharge pipes and their supporting structures). Is done.

Intersection of the intake and discharge pipes in the turbine building or in the foundation of the turbine building can be eliminated by the arrangement of seawater pumps. That is, the seawater pump connected to the turbine building near the intake side is installed inside the seawater pump building, and the seawater pump connected to the turbine building near the water discharge side is installed outside so as to sandwich the seawater pump. I do. Further, depending on the shape of the site, the seawater is guided to the seawater pump building by a waterway, while a waterway is also provided on the water discharge side to finally discharge the seawater to the sea, so that various types of power plants can be used. It is possible to adapt to the degree of freedom of the shape.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described below with reference to FIGS.

FIG. 1 generally illustrates the positions of a seawater pump building 4, a turbine building 1, a reactor building 12, and a water discharge channel 8 according to this embodiment. A plurality (2 in this figure)
Base) The turbine building 1 is installed in series in the direction of the turbine / generator axis 2 and the seawater pump building 4 is installed in the direction of the turbine / generator axis 2 of the turbine building 1 near the intake side.
Seawater is guided by a seawater pump 5 (not shown) in the seawater pump building 4 to the condenser 3 in the turbine building by a water pipe 6 (not shown). The seawater having cooled the steam is guided by a water discharge pipe 7 (not shown) to a water discharge channel 8 provided in the turbine / generator axial direction of the turbine building 1 near the water discharge side, and finally discharges the seawater to the sea 9. .

With this configuration, seawater is routed along the shortest route in the direction of the turbine / generator axis 2 and the seawater intake / discharge pipe occupying most of the intake / discharge equipment is installed within the projected area of the turbine building 1. The overall power plant plan will be more compact.

Next, an embodiment in which the seawater intake and discharge pipe is installed on the foundation of the turbine building 1 will be described with reference to FIGS. FIG. 2 is a plan view showing the turbine building foundation 10 of a plurality of units, and FIG. 3 is a view showing a cross section of the turbine building 1.

In FIG. 2, the intake pipe 6 of Unit A is connected to the turbine building 1
Side to supply seawater to the condenser 3, and the water discharge pipe 7 around the lower part of the condenser 3.

Further, the water intake pipe 6 of the B-unit is routed to the outside of the A-unit to supply seawater to the condenser 3 of the B-unit. The water discharge pipe 7 of the No. B machine is configured to route around the lower part of the condenser 3 and the outside of the No. A water discharge pipe 7 like the A machine.

FIG. 3 shows an example in which the water intake pipe 6 and the water discharge pipe 7 are installed in the turbine building foundation 10. In the present embodiment, the intake pipe 6 and the water discharge pipe 7 are configured to achieve their functions by making the turbine building foundation 10 hollow and hollow, so that the amount of steel piping can be reduced.

According to the embodiment shown in FIGS.
-The water discharge pipe 7 can be used also as the turbine building foundation 10, and it is possible to avoid crossover between them, thereby reducing the amount of civil engineering equipment and suppressing an increase in excavation amount.

FIG. 4 is a view showing an embodiment of the arrangement of the seawater pump 5 according to the third aspect. In order to avoid the intersection of the Unit A side intake pipe 6 and the Unit B side intake pipe 6 (referred to as Unit A and Unit B from the intake side) shown in FIG.
Intake pipe 6 for supplying seawater to the condenser 3 inside the Unit 3 turbine building
The seawater pump 5 connected to the A is installed at the center of the seawater pump building 4, and the seawater pump 5 connected to the B-side intake pipe 6 is sandwiched by the seawater pump 5 connected to the A-side intake pipe 6. Has been placed.

The arrangement of the seawater pump 5 allows the intake pipe 6
It is possible to avoid crossing between each other.

FIG. 5 is a diagram showing an embodiment of the fourth aspect. In this embodiment, in a power plant having a shoreline in a direction parallel to the turbine building 1, seawater is guided from the sea 9 to the front of the seawater pump building 4 in the seawater channel 11, and a similar seawater is provided on the rear surface of the water discharge channel 8 on the water discharge side. By installing the road 11, the seawater is finally discharged to the sea 9.

With such a power plant configuration, it is possible to easily add a plurality of power plants.

Although this drawing is an embodiment of the building structure according to claim 1, various variations are possible by combination with the sea waterway 11, and the degree of freedom of the plot plan is dramatically increased. It is also effective at narrow sites, landfill sites where the amount of landfill soil needs to be reduced, and even at artificial island sites, in terms of physical quantity reduction and flexibility in power station layout.

[0034]

According to the present invention, the following effects can be obtained without changing the structure and dimensions of the conventional device.

(1) Reducing the amount of civil works in the water intake and discharge facilities (2) Reducing the projected area of the power plant (3) Expanding the degree of freedom in the layout of the power plant (4) Expanding the suitability for narrow sites, landfills and artificial islands

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a main building of a power plant according to an embodiment of the present invention.

FIG. 2 is a plan view of a water discharge pipe in a turbine building foundation according to an embodiment of the present invention.

FIG. 3 is a sectional view of a water discharge pipe in a turbine building foundation according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating an arrangement of a seawater pump according to an embodiment of the present invention.

FIG. 5 is a diagram showing a power plant building configuration according to another embodiment of the present invention.

FIG. 6 is a diagram showing an example of an arrangement of a BWR type power plant according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Turbine building 2 ... Turbine / generator axis line 3 ... Condenser 4 ... Seawater pump building 5 ... Seawater pump 6 ... Intake pipe 7 ... Water discharge pipe 8 ... Water discharge channel 9 ... Sea 10 ... Turbine building foundation 11 ... Sea water channel 12 … Reactor building

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-292484 (JP, A) JP-A-7-191186 (JP, A) JP-A-62-129507 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) G21D 1/00 GDB

Claims (4)

(57) [Claims] 1. A seawater pump building that houses a seawater pump that takes in seawater from a sea area, and a steam turbine, a generator, and a condenser that cools steam discharged from the steam turbine with seawater and condenses it. And a plurality of turbine buildings provided with a water intake passage for taking in seawater from the seawater pump building and a water discharge passage for discharging used seawater from the condenser to the sea area, A water intake and discharge facility for a power plant, wherein a seawater pump building and the plurality of turbine buildings are installed in series in a turbine / generator axis direction. 2. The seawater pump building is installed so as to take in seawater from a sea area in front of the turbine / generator axial direction, and connects the intake channel and the water discharge channel to a lower part of the turbine building or a turbine in the turbine / generator axial direction. The power plant water intake and discharge facility according to claim 1, wherein the water supply facility is disposed in a building, and discharges seawater to a sea area on the rear side of the turbine building opposite to the water intake in the axial direction of the turbine / generator. . 3. A seawater pump connected to a condenser inside a turbine building on a water intake side of a plurality of turbine buildings, and a seawater pump connected to a turbine building located closer to a water discharge side of the plurality of turbine buildings. The power plant water intake and discharge equipment according to claim 1 or 2, wherein the water supply pumps are sequentially arranged outside the seawater pump. 4. The seawater channel provided on the intake side of the seawater pump building and the water discharge side of the turbine building are intersecting with the water intake channel and the water discharge channel, respectively. Any of the power station water intake and discharge facilities.