Power equipment in plant

Abstract

To appropriately ensure power in an emergency in power equipment in a plant.SOLUTION: Power equipment in a plant comprises: a discharge pit that discharges sea water after being used as cooling water in the plant; and a sea water battery that is arranged in the discharge pit.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to the power facilities of a plant.

Background Art

[0002] A reactor containment vessel is erected on a solid ground such as rock, and a reactor is disposed inside. The reactor is supported by a concrete structure provided at the base of the reactor containment vessel. In nuclear power facilities, as a severe accident, an event of loss of the normally used power supply is assumed. In this case, as a countermeasure against the event of loss of the normal power supply, an emergency power supply is installed. As such a technology, for example, there is one described in Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology described in Patent Document 1, an emergency diesel generator is installed in a building, and power is secured by operating the emergency diesel generator. However, when a tsunami associated with an earthquake occurs and the emergency diesel generator is flooded, there is a problem that the emergency diesel generator cannot be operated.

[0005] The present disclosure solves the above-described problems, and an object thereof is to provide a power facility for a plant that can appropriately secure power in an emergency.

Means for Solving the Problems

[0006] The power facility of the plant of the present disclosure for achieving the above object includes a drainage pit that discharges water after using seawater to cool the water in the plant, and a seawater battery disposed in the drainage pit.

Advantages of the Invention

[0007] According to the power facility of the plant of the present disclosure, power can be appropriately secured in an emergency.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0009] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited by this embodiment, and when there are a plurality of embodiments, those configured by combining each embodiment are also included. In addition, the constituent elements in the embodiments include those that can be easily assumed by those skilled in the art, substantially the same ones, and those within the so-called equivalent range.

[0010] <Configuration of Power Facility> FIG. 1 is a front schematic view showing the power facility of the plant of the present embodiment, and FIG. 2 is a plan schematic view showing the power facility of the plant of the present embodiment.

[0011] As shown in FIGS. 1 and 2, the power facility 10 is arranged in the nuclear power plant 11. Note that the power facility 10 is not limited to the nuclear power plant 11 and may be arranged in a thermal power plant, a chemical plant, or the like. The nuclear power plant 11 is installed on the land 14 with the seas 12 and 13 sandwiching it on both sides. The reactor building 15 is installed on the land 14, and the reactor containment vessel 16 is installed inside it. The reactor containment vessel 16 has a reactor (not shown) arranged inside it. The power facility 10 is provided in the water intake facility 17 of the nuclear power plant 11.

[0012] The reactor building 15 is installed near the coast. The water intake facility 17 is arranged near the coast and takes in seawater as cooling water. The water intake facility 17 supplies the taken-in seawater to the reactor building 15 for use as cooling water. The water intake facility 17 discharges the used seawater that has been used in the reactor building 15.

[0013] The water intake facility 17 includes a water intake pit 21, a water intake pump 22, a water intake pipe 32, a discharge pit 23, and a discharge pipe 24.

[0014] The water intake pit 21 is provided in a recessed shape that is recessed from the sea 12 toward the land 14 side. The water intake pit 21 has a long shape extending from the sea 12 toward the land 14. Seawater flows into and is stored in the water intake pit 21 from the sea 12. A pump building 31 is provided on the land 14 adjacent to the water intake pit 21. The water intake pump 22 is arranged inside the pump building 31. The water intake pump 22 is arranged at the innermost part of the water intake pit 21, and the water intake part 32a is immersed in the seawater of the water intake pit 21. One end of the water intake pipe 32 is connected to the upper part of the water intake pump 22. The reactor building 15 has a cooling device 33 arranged inside it. The other end of the water intake pipe 32 is connected to the cooling device 33.

[0015] When the water intake pump 22 operates, the water intake pump 22 takes in the seawater in the water intake pit 21 from the water intake part 22a. The seawater taken in by the water intake pump 22 is supplied to the cooling device 33 through the water intake pipe 32. At this time, a flow of seawater is generated in the water intake pit 21 from the sea 12 toward the water intake pump 22.

[0016] The cooling device 33 is a heat exchanger. The cooling device 33 cools, for example, the steam used for power generation with seawater. The cooling device 33 cools, for example, the cooling water of the spent fuel pool with seawater. Also, the cooling device 33 cools, for example, various devices used in the nuclear power plant 11 with seawater. Note that when a plurality of cooling devices 33 are provided, the intake pipe 32 branches into a plurality, and the seawater taken in by the intake pump 22 is supplied to the plurality of cooling devices 33 by the intake pipe 32. Also, when a plurality of cooling devices 33 are provided, a plurality of sets of intake pumps 22 and intake pipes 32 are provided.

[0017] The drain pit 23 is provided in a concave shape recessed from the sea 13 toward the land 14 side. The drain pit 23 has a shape that is long from the sea 13 toward the land 14. The drain pit 23 stores the seawater of the sea 13. One end of the drain pipe 24 is connected to the cooling device 33, and the other end is disposed at the innermost part of the drain pit 23. The other end of the drain pipe 24 is disposed in the drain pit 23. In this case, the drain opening at the other end of the drain pipe 24 may be immersed in the seawater of the drain pit 23 or may be located above the water surface of the seawater in the drain pit 23.

[0018] When the used seawater is discharged from the cooling device 33 into the drain pipe 24, the drain pipe 24 discharges the seawater from the drain opening into the drain pit 23. At this time, a flow of seawater is generated in the drain pit 23 from the drain pipe 24 toward the sea 12.

[0019] The power facility 10 is provided in the water intake facility 17. That is, the power facility 10 includes a drain pit 23, a seawater battery 41, and a storage battery 42.

[0020] The seawater battery 41 is disposed in the drainage pit 23. The seawater battery 41 is disposed in the drainage pit 23 on the downstream side in the seawater flow direction from the drainage opening 24a of the drain pipe 24. Preferably, the seawater battery 41 is disposed facing the downstream side in the seawater flow direction with respect to the drainage opening 24a of the drain pipe 24. At this time, the upper surface of the seawater battery 41 is located below the water surface of the seawater stored in the drainage pit 23. The drain pipe 24 may have the drainage opening 24a facing downward in the vertical direction or facing the sea 13 side in the horizontal direction.

[0021] The seawater battery 41 has a cell 41a having a sandwich structure in which a separator is disposed between a positive electrode (cathode) and a negative electrode (anode). The seawater battery 41 has a plurality of cells 41a. For the seawater battery 41, magnesium, aluminum, or the like is applied to the anode, and fiber carbon or the like is used for the cathode.

[0022] Then, in the seawater battery 41, a plurality of cells 41a are arranged at intervals along the seawater flow direction and in a direction intersecting the seawater flow direction.

[0023] Note that the arrangement conditions of the seawater battery 41 in the drainage pit 23 are preferably the following conditions. 1. The cells 41a of the seawater battery 41 are arranged along the seawater flow direction. 2. The minimum flow velocity of the seawater in the drainage pit 23 is set to 0.1 m / s. When the flow velocity of the seawater in the drainage pit 23 is 0.1 m / s or more, it becomes possible to remove the products adhering to the cell 41a. Note that the setting of the seawater flow velocity is set to an optimum value in consideration of the distance between the drainage opening 24a of the drain pipe 24 and the seawater battery 41, the shape of the drainage pit 23, the discharge amount of the seawater from the drainage opening 24a of the drain pipe 24, and the like. 3. The maximum temperature of the seawater in the drainage pit 23 is set to 35°C. When the temperature of the seawater in the drainage pit 23 is 35°C or less, the power generation efficiency of the seawater battery 41 can be improved. 4. Position the upper surface of the cell 41a of the seawater battery 41 at a position 0.3 m or less below the water surface of the seawater. By positioning the upper surface of the cell 41a of the seawater battery 41 at a position 0.3 m or less below the water surface of the seawater, it is possible to suppress the exposure of the cell 41a due to the waves of the seawater in the drain pit 23.

[0024] The seawater battery 41 is connected to the storage battery 42. The storage battery 42 is arranged in the reactor building 15 and connected to the seawater battery 41 by a power line. Note that the storage battery 42 may be arranged in a building other than the reactor building 15 depending on its use.

[0025] Note that even if there is no water discharge from the drain pipe 24, the drain pit 23 can generate a flow due to the inflow and outflow of seawater from the sea 13, and the flow of seawater can act on the seawater battery 41, and the seawater battery 41 can generate electricity.

[0026] <Operation of Power Equipment> During the normal operation of the nuclear power plant 11, when the intake pump 22 operates, seawater is taken in from the intake pit 21 and supplied to the cooling device 33, and the used seawater is discharged from the drain pipe 24 to the drain pit 23. At this time, since the seawater discharged from the drain pipe 24 flows toward the sea 13 in the drain pit 23, the seawater battery 41 arranged in the drain pit 23 generates electricity, and the generated electricity is stored in the storage battery 42.

[0027] In the event of an emergency at the nuclear power plant 11, when the normal power supply is lost, the operation of the intake pump 22 stops, and the cooling device 33 may cease to function. However, since the power generated by the seawater battery 41 is stored in the storage battery 42, the intake pump 22 can be operated using the power of the storage battery 42. When the intake pump 22 operates, a flow of seawater is generated in the drain pit 23, so that the seawater battery 41 can generate electricity and store the generated power in the storage battery 42. Note that the power of the storage battery 42 can also be supplied to equipment other than the intake pump 22.

[0028] [Advantages and Effects of this Embodiment] The power facility of the plant according to the first aspect includes a discharge pit 23 that discharges seawater after using it to cool water in the nuclear power plant 11, and a seawater battery 41 disposed in the discharge pit 23.

[0029] According to the power facility of the plant according to the first aspect, in the event of an emergency at the nuclear power plant 11, even if the normal power supply is lost, the intake pump 22 can be operated by the power generated by the seawater battery 41. That is, even in the event of an emergency at the nuclear power plant 11, power can be appropriately secured.

[0030] The power facility of the plant according to the second aspect is the power facility of the plant according to the first aspect, and further, the discharge pit 23 is provided with a discharge pipe 24 that discharges used seawater upstream in the seawater flow direction, and the seawater battery 41 is disposed downstream in the seawater flow direction from the discharge opening 24a of the discharge pipe. Thereby, the seawater battery 41 can generate electricity efficiently by the action of the seawater flow on the seawater battery 41.

[0031] The power facility of the plant according to the third aspect is the power facility of the plant according to the first aspect or the second aspect, and further, the seawater battery 41 is disposed to face downstream in the seawater flow direction with respect to the discharge opening 24a. Thereby, seawater can be efficiently supplied to the seawater battery 41.

[0032] The power facility of the plant according to the fourth aspect is the power facility of the plant according to any one of the first aspect to the third aspect, and further, the upper surface of the seawater battery 41 is located below the water surface of the seawater stored in the discharge pit 23. Thereby, the exposure of the seawater battery 41 from the seawater can be suppressed.

[0033] The power facility of the plant according to the fifth aspect is the power facility of the plant according to the fourth aspect, and further, the seawater battery 41 has a plurality of cells 41a, and the plurality of cells 41a are arranged at intervals along the seawater flow direction and in a direction intersecting the seawater flow direction. Thereby, the seawater battery 41 can generate electricity efficiently.

[0034] The power facility of the plant according to the sixth aspect is the power facility of the plant according to any one of the first to fifth aspects, and further includes a storage battery 42 connected to the seawater battery 41. Thereby, even when the normal power supply is lost during an emergency of the nuclear power plant 11, the intake pump 22 can be operated by the power stored in the storage battery 42. That is, even during an emergency of the nuclear power plant 11, power can be appropriately secured.

Explanation of symbols

[0035] 10 Power facility 11 Nuclear power plant 12, 13 Sea 14 Land 15 Reactor building 16 Reactor containment vessel 17 Intake facility 21 Intake pit 22 Intake pump 23 Drain pit 24 Drain pipe 31 Pump building 32 Intake pipe 33 Cooling device 41 Seawater battery 41a Cell 42 Storage battery

Claims

1. A power facility for a plant, comprising a drainage pit that discharges seawater after using it for cooling water in the plant, and a seawater battery disposed in the drainage pit.

2. The drainage pit is provided with a drain pipe for discharging used seawater on the upstream side in the seawater flow direction, and the seawater battery is disposed on the downstream side in the seawater flow direction from the drain opening of the drain pipe. The power facility for a plant according to Claim 1.

3. The seawater battery is disposed facing the downstream side in the seawater flow direction with respect to the drain opening. The power facility for a plant according to Claim 2.

4. The upper surface of the seawater battery is located below the water surface of the seawater stored in the drainage pit. The power facility for a plant according to Claim 1.

5. The seawater battery has a plurality of cells, and the plurality of cells are arranged at intervals along the seawater flow direction and in a direction intersecting the seawater flow direction. The power facility for a plant according to Claim 1.

6. Having a storage battery connected to the seawater battery. The power facility for a plant according to Claim 1.

Images