JP4475931B2 - Wave-proof spillway and coastal plant using the same - Google Patents

Description

  The present invention relates to a breakwater-type water discharge channel that is a water discharge part of a seawater circulation water channel that circulates seawater to a seawater plant such as a power plant, and a seawater plant using the same.

  Usually, in a power plant that generates power using a nuclear power plant or a thermal power plant, steam is generated in a steam generator by heat generated from a nuclear reactor or a boiler, and a high-pressure steam turbine and further a low-pressure steam turbine are generated with the steam. Electric power is generated by driving and operating a generator attached to the turbine main shaft.

  The nuclear power plant and the thermal power plant employ a condensate water supply system, and the steam that contributes to power generation in these steam turbines is condensed in the condenser and becomes condensate for temporary storage in the condenser. Is done. A pipe for heat exchange passes through the condenser, and cooling water flows through the pipe for heat exchange, and heat is exchanged between steam outside the pipe and cooling water inside.

  The cooling water introduced into the condenser is pumped up from the sea by a pump and introduced into the condenser through a water channel. FIG. 8 shows a schematic diagram of a conventional water channel for condenser cooling water flow. The condenser cooling water flow channel B shown in FIG. 8 includes a water intake 91, a pump 92 for pumping seawater from the water intake 91, and an introduction water channel for introducing seawater pumped up by the water intake 91 into the condenser 93. 94, a water discharge pit 95 into which seawater discharged from the condenser 93 flows, and a water discharge passage 96 and a water discharge port 97 for returning the seawater to the sea SE from the water discharge pit 95.

  When increasing the amount of power generated due to an increase in power demand, etc., the power plant has a heat source (reactor in the case of nuclear power generation, boiler in the case of thermal power generation), steam generator, steam turbine, condensate in a location close to existing facilities. Add more equipment.

  A condenser 93 is also added along with the expansion of the power plant, but it is inefficient to newly install all the condenser cooling water channels B for sending cooling water to the condenser 93, so one intake 91 and the introduction water channel 94 draw up seawater, branch off in the middle, and distribute and flow the seawater into the condenser 93 provided in each power plant.

  Thereafter, the seawater flowing out from each condenser 93 flows into a water discharge pit 95 provided downstream of each condenser 93 and flows into a water discharge channel 96 connected to the water discharge pit 95. The water discharge channel 96 joins on the way and is discharged from one water discharge port 97.

  In the condenser cooling water flow channel B, by providing the discharge pit 95, the pressure loss of the water flowing in the channel B can be reduced, and the head of the pump 92 for causing the water in the channel B to flow increases. Can be prevented. Seawater that has flowed into the water discharge pit 95 is discharged into the sea at a pressure due to a difference in height between the water discharge pit 95 and the water discharge port 97.

Moreover, even if a tsunami and a high wave generate | occur | produce in the sea where the water discharge port 97 is arrange | positioned by providing the water discharge pit 95, the water level fluctuation | variation of the water discharge pit 95 can be suppressed.
Japanese Patent Laid-Open No. 10-132992 Japan Civil Engineering Association "Design of civil engineering structures for thermal power and nuclear power plants"

  When one water discharge pit 95 is connected to one water discharge path 96 and the water discharge port 97, when waves propagate from the water discharge port 97, the water pits 95 are damped while vibrating in the water discharge pit 95 and the water discharge path 96. However, when the water discharge pits 95 are added and a plurality of water discharge pits 95 are connected to one water discharge port 97, the water discharge paths 96 connected to the water discharge pits 95 have natural frequencies and are adjacent to each other. Depending on the natural frequency of the water discharge pit 95 connecting the water discharge pits 95, so-called surging occurs in which the vibration of the seawater resonates and is amplified in the pipe line connecting the water discharge pits 95.

  Due to the occurrence of surging, the vibration of the seawater in the water discharge channel 96 is not settled, and water discharge from each water discharge pit is not performed well. Further, since the vibration is amplified, the flow rate of the pump 92 is adversely affected. Furthermore, since the flow rate of the pump 92 is reduced, the introduction of the cooling water to the condenser 95 becomes insufficient, which causes a trouble in the condensate water supply system.

  In view of the above problems, the present invention prevents surging that occurs in the water discharge pit and the water discharge channel due to waves, and the surging causes seawater to overflow from the water discharge pit, damage to the water discharge pit, the water discharge channel, and the pump. An object of the present invention is to provide a wave breakwater discharge channel that can prevent the occurrence of defects.

In order to achieve the above object, the present invention provides a waterfront plant that circulates and uses seawater, and is connected to a water discharge pit for storing seawater circulated in the plant and the water discharge pit, and the seawater flows in. An upstream flowing water channel, a downstream flowing water channel for discharging sea water flowing from the upstream flowing water channel to the sea, and sea water flowing through the downstream flowing water channel connected to the downstream flowing water channel into the sea A plurality of water discharge pits are provided, and each upstream flow channel connected to each of the plurality of water discharge pits joins at one junction and is connected to the downstream flow channel. The horizontal cross-sectional area of the discharge pit is S, the cross-sectional area in the direction perpendicular to the seawater flow line of the upstream flow channel is s, and the upstream flow channel is connected to the discharge pit. downstream When the length to the merging portion with the flowing water channel is L, the L · S / s values of the plurality of water discharge pits and the upstream flowing water channel connected thereto are the same value. Provide a breakwater-type drainage channel.

  According to this structure, since the natural frequency of the upstream flow channel connected to each discharge pit becomes equal, it is possible to prevent the seawater from vibrating (surging) by resonating. Thereby, it is possible to prevent the pump head provided for water intake from rising without the seawater flowing from the discharge pit, or the cooling performance from being lowered without seawater being sent into the plant.

  Further, it is possible to prevent the occurrence of a problem that the vibration of the seawater is amplified in the upstream flowing water channel and overflows from the discharge pit, or the vibration is further increased to destroy the flowing water channel.

In order to achieve the above object, the present invention relates to a waterfront plant that circulates and uses seawater, and is connected to a water discharge pit for storing seawater circulated in the plant and the water discharge pit, and the seawater flows in. An upstream flowing water channel, a downstream flowing water channel for discharging sea water flowing from the upstream flowing water channel to the sea, and sea water flowing through the downstream flowing water channel connected to the downstream flowing water channel into the sea A plurality of water discharge pits are provided, and at least two of the upstream flow channels connected to the plurality of water discharge pits are joined together in advance at one first junction. Are connected to the pre-combined flow water channel, and the other upstream flow water channel and the pre-combined flow water channel merge at one second confluence and are connected to the downstream flow water channel, and the discharge pipe The cross-sectional area of the horizontal cross section is S, the length of the upstream flow channel that merges with the first merge portion is L1, the cross-sectional area is s1, and the length of the upstream flow channel that merges with the second merge portion is L2. If the cross-sectional area is s2, the length of the pre-combined flow channel is L3, and the cross-sectional area is s3,
The values of S · (L1 / s1 + L3 / s3) of the upstream flow channels that merge with the first merge portion have the same value, and the S · of each of the upstream flow channels that merge with the second merge portion. Provided is a wave breakwater discharge channel characterized in that the value of L2 / s2 is the same value as the value of S · (L1 / s1 + L3 / s3) of the upstream flow channel that joins the first junction.

  According to this configuration, even if there are few degrees of freedom in installing the upstream flow channel due to restrictions on the installation location, problems such as breakage of the water discharge pit and flow breakwater such as the flow channel due to surging occur. Can be prevented.

In order to achieve the above object, the present invention relates to a waterfront plant that circulates and uses seawater, and is connected to a water discharge pit for storing seawater circulated in the plant and the water discharge pit, and the seawater flows in. An upstream flowing water channel, a downstream flowing water channel for discharging sea water flowing from the upstream flowing water channel to the sea, and sea water flowing through the downstream flowing water channel connected to the downstream flowing water channel into the sea A plurality of water discharge pits are provided, and each upstream flow channel connected to each of the plurality of water discharge pits joins at one junction and is connected to the downstream flow channel. And each upstream flow channel connected to the plurality of water discharge pits has the same length from the connection portion with the water discharge pit to the junction with the downstream flow channel. Type drainage channel Provided.

  According to this configuration, surging is prevented by matching the length, and even if the cross-sectional area of the pipeline and the cross-sectional area of the water discharge pit are not accurately grasped, the water discharge pit, fluid water channel, etc. due to surging It is possible to prevent the occurrence of problems such as breakage of the breakwater discharge channel.

  In order to achieve the above-mentioned object, the present invention provides a coastal plant provided with the above-described wave breakwater discharge channel.

  According to the present invention, surging that occurs in the water discharge pit and the water discharge channel due to the propagation of waves is prevented, seawater overflows from the water discharge pit due to the surging, and occurrence of problems such as damage to the water discharge pit, the water discharge channel, and the pump Therefore, it is possible to provide a seawater-type water discharge channel that can prevent the water from flowing, and a coastal plant including the wave-proof water discharge channel.

  The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram in which a part of a nuclear power plant, which is an example of a coastal plant that employs a breakwater discharge channel according to the present invention, is omitted, and FIG. 2 is a coastal view using the breakwater discharge channel according to the present invention. The schematic of an example of the water channel for cooling water of a plant is shown.

  The nuclear power plant PP shown in FIG. 1 drives the steam turbine ST after boiling the water circulating in the reactor At into steam. The steam after driving the steam turbine ST is sent to the condenser Rw, heat-exchanged with the seawater in the condenser Rw, condensed to become condensed water, temporarily stored in the condenser Rw, and sent again to the reactor At. . Normally, a nuclear power plant PP is provided with a plurality of reactors At (three in this embodiment), and each of the plurality of reactors At is provided with a steam turbine ST and a condenser Rw. The same applies to the case where a boiler is used instead of the nuclear reactor At.

  As shown in FIG. 1, the cooling water channel for introducing seawater into the condenser Rw includes a water intake 1 installed in the sea SE as an inlet for seawater, a water intake pump 2 that sucks up seawater from the water intake 1, and a water intake pump 2 is introduced into the condenser Rw, and the seawater heat-exchanged with the steam in the condenser Rw is discharged from the condenser Rw and discharged from the discharge pipe 4. And a wave-proof spillway 5 for discharging the seawater that has been discharged into the sea SE.

  The breakwater-type water discharge channel 5 is connected to the discharge pipe 4 and flows into the sea SE, the water discharge pit 51 connected to the water discharge pit 51 and the flowing water channel 52 that flows the sea water into the sea SE, and the water channel 52 connected to the flow channel 52 and the sea water into the sea SE And a water outlet 53 for discharging water. By providing the water discharge pit 51 in the pipe of the cooling water channel, it is possible to prevent the head of the intake pump 2 from becoming too high due to pressure loss when seawater flows through the channel.

  As shown in FIG. 2, the cooling water channel A1 is not limited thereto, but in this embodiment, the cooling water channel A1 includes a first condenser Rwa, a second condenser Rwb, and a third condenser Rwc. Condensate is provided to different reactors.

  The introduction water channel 3 has a branch portion 31, and branching at the branch portion 31 (three-way branch in this embodiment) introduces cooling seawater into the plurality of condensers Rwa, Rwb, and Rwc. The intake pump 2 is provided on the upstream side of the branch portion 31, between the branch portion 31 of the introduction water channel 3 and the intake port 1.

  The breakwater-type water discharge channel 5A includes a first water discharge pit 51a, a second water discharge pit 51b, and a third water discharge pit 51c. Water discharge pits 51a (51b, 51c) are provided. The flowing water channel 52 is divided into an upstream flowing water channel 521 and a downstream flowing water channel 522. Each of the water discharge pits 51a, 51b, 51c is connected to the first upstream flow channel 521a, the second upper flow channel 521b, and the third upper flow channel 521c. The upstream flowing water channels 521 a, 521 b, and 521 c merge at the merging portion 523 and are connected to the downstream flowing water channel 522.

  The water outlet 53 is inserted in the sea SE, and discharges seawater accumulated in the water discharge pits 51a, 51b, 51c into the sea due to a difference in height between the water outlet 53 and the water discharge pits 51a, 51b, 51c.

  The horizontal cross-sectional area S1 of the first discharge pit 51a, the length from the connection portion of the first upstream flow channel 521a to the first discharge pit 51a to the junction 523 with the other upstream flow channel L1, The cross-sectional area through which seawater flows in the first upstream flow channel 521a is s1, similarly, the cross-sectional area of the second discharge pit 51b is S2, and the length and cross-sectional area of the second upstream flow channel 521b are L2, s2. The cross-sectional area of the third water discharge pit 51c is S3, and the length and cross-sectional area of the third upstream flow channel 521c are L3 and s3.

  At this time, the first water discharge pit 51a and the first upstream flow channel 521a, the second water discharge pit 51b and the second upstream flow channel 521b, the third water discharge pit 51c and the third upstream flow The relationship of the water channel 521c is represented by the following formula.

Formula 1

  By forming the first to third water discharge pits 51a, 51b, 51c and the first to third upstream flow channels 521a, 521b, 521c so as to satisfy this relationship, the first to third upstream flows The natural frequencies of the water channels 521a, 521b, and 521c can be made the same. Thereby, vibration (surging) can be prevented in at least two of the first upstream flowing water channel 521a, the second upstream flowing water channel 521b, and the third upstream flowing water channel 521c.

  By preventing surging, the normal flow of the cooling seawater can be prevented, and the cooling efficiency of the condenser can be prevented from deteriorating. Furthermore, by resonating, vibration can be amplified and seawater can be prevented from being ejected from the water discharge pits 51a, 51b, 51c, or the upstream flow channels 521a, 521b, 521c can be prevented from being damaged.

  FIG. 3 shows a schematic diagram of another example of the cooling water channel of the seaside plant using the wave breakwater channel according to the present invention.

  In the cooling water channel A2 shown in FIG. 3, the first upstream flow channel 521a and the second upstream flow channel 521b of the wave-breaking water discharge channel 5B are joined together in advance, and the combined preflow flow channel 521d is combined. Furthermore, it merges with the third upstream flow channel 521c. The other parts have substantially the same structure as the cooling water channel A1 shown in FIG. 2, and the same reference numerals are given to the substantially same parts.

  In the wave-break water discharge channel 5B shown in FIG. 3, the first upstream flow channel 521a and the second upstream flow channel 521b merge at the first junction 524 and flow downstream as a pre-combined flow channel 521d. Then, the pre-merged flow water channel 521d and the third upstream flow water channel 521c merge at the second downstream junction 523. Seawater merged at the second merge section 523 is guided to the water discharge port 53 in the downstream-side flowing water channel 522 and discharged into the sea SE.

  At this time, the cross-sectional area of the first upstream flow channel 521a is s11, the length from the first water discharge pit 51a to the first junction 524 is L11, and the cross-sectional area of the second upstream flow channel 521b is s21. The length from the second water discharge pit 51b to the first merge portion 524 is L21, the cross-sectional area of the pre-merged flow water channel 521d is s4, and the length from the first merge portion 524 to the second merge portion 523 is L4. Then, the relationship between the 1st-3rd discharge pit 51a, 51b, 51c, the 1st-3rd upstream flow channel 521a, 521b, 521c, and the pre-combining flow channel 521d is represented by the following formula | equation.

Formula 2

  By forming the first to third water discharge pits 51a, 51b, 51c and the first to third upstream flow channels 521a, 521b, 521c so as to satisfy this relationship, the first to third upstream flows Waves propagate to the water channels 521a, 521b, and 521c, and seawater is generated in at least two of the first upstream flow channel 521a, the second upstream flow channel 521b, and the third upstream flow channel 521c. It is possible to prevent vibration (surging) from impairing the flow of seawater and deteriorating the cooling efficiency of the condenser. Furthermore, by resonating, vibration can be amplified and seawater can be prevented from being ejected from the water discharge pits 51a, 51b, 51c, or the upstream flow channels 521a, 521b, 521c can be prevented from being damaged.

  FIG. 4 shows a schematic diagram of still another example of the cooling water channel of the seaside plant using the wave breakwater channel according to the present invention. The wave-breaking water discharge channel A3 shown in FIG. 4 has substantially the same shape as the wave-breaking water discharge channel A1 shown in FIG. 2, and substantially the same members are denoted by the same reference numerals.

  4 has a first water discharge pit 51a, a second water discharge pit 51b, and a third water discharge pit 51c, and each of the water discharge pits 51a, 51b, 51c has a first water discharge pit 51c. Upstream flow channel 521a, second upstream flow channel 521b, and third upstream flow channel 521c are connected, and the first to third upstream flow channels 521a, 521b, and 521c join downstream. It joins at the part 523 and is connected to the downstream flow channel 522.

  The length from the first discharge pit 51a to the junction 522 of the first upstream flow channel 521a, the length from the second pit 51b to the junction 522 of the second upstream flow channel 521b, and the third upstream The length from the 3rd water discharge pit 51c of the side flowing water channel 521c to the junction 522 is formed with the same length.

  By making the lengths of the first to third upstream fluid channels 521a, 521b, and 521c the same, the first upstream fluid channel 521a, the second upstream fluid channel 521b, and the third Seawater can be prevented from vibrating (surging) in the upstream flow channel 521c. By preventing surging, it is possible to prevent the cooling efficiency of the condenser from being deteriorated without disturbing the flow of seawater. Furthermore, by resonating, vibration can be amplified and seawater can be prevented from being ejected from the water discharge pits 51a, 51b, 51c, or the upstream flow channels 521a, 521b, 521c can be prevented from being damaged.

  FIG. 5 shows a schematic view of another example of the cooling water channel of the seaside plant using the wave breakwater channel according to the present invention. The wave-breaking water discharge channel A4 shown in FIG. 5 has substantially the same shape as the wave-breaking water discharge channel A3 shown in FIG. 4, and substantially the same members are denoted by the same reference numerals.

  5 has a first water discharge pit 51a, a second water discharge pit 51b, and a third water discharge pit 51c, and each of the water discharge pits 51a, 51b, 51c includes a first water discharge pit 51a. Upstream flow channel 521a, second upstream flow channel 521b, and third upstream flow channel 521c are connected, and the first to third upstream flow channels 521a, 521b, and 521c join downstream. It joins at the part 523 and is connected to the downstream flow channel 522.

  The length L0 from the junction 523 to the outlet 53 of the downstream flow channel 522 is the length L13 from the discharge pit 51a to the junction 523 of the first upstream flow channel 521a, and the second upstream flow channel 521b. Length L23 and the length L33 of the third upstream-side flowing water channel 521c, that is, L0 >> L13, L0 >> L23, and L >> L33 are all satisfied.

  In this case, the vibration frequency of these discharge pits is determined by the length of the water channel, but the lengths L13, L23, L33 of the first to third upstream flow channels 521a, 521b, 521c are downstream. Since it is significantly different from the length L0 of the flowing water channel 522, the sea water in the water channel can suppress vibrations, hindering the flow of sea water and deteriorating the cooling efficiency of the condenser. Can be prevented. Furthermore, since it is difficult to resonate, it is possible to prevent the vibration caused by the resonance from being amplified and the seawater from being ejected from the water discharge pits 51a, 51b, 51c and the upstream flow channels 521a, 521b, 521c from being damaged.

  FIG. 6 shows a schematic view of another example of the cooling water channel of the seaside plant using the wave-breaking water channel according to the present invention.

  The breakwater-type drainage channel A5 shown in FIG. 6 introduces seawater into three condensers, ie, a first condenser Rwa, a second condenser Rwb, and a third condenser Rwc, Is a water channel that returns seawater discharged from the water heaters Rwa, Rwb, and Rwc to the sea, and a first discharge pipe 4a that is connected to the first condenser Rwa and a second water pipe that is connected to the second condenser Rwb. The discharge pipe 4b and the third discharge pipe 4c connected to the third condenser Rwc are connected to the drain pit 51d.

  A fluid channel 52 is connected to the drain pit 51 d, and the fluid channel 52 is connected to a water outlet 53. The wave breakwater discharge channel A5 includes one drain pit 51d and one flow channel 52. In the flowing water channel 52, seawater flows into the discharge pit 51d from the first discharge pipe 4a, the second discharge pipe 4b, and the third discharge pipe 4c, so that the flowed seawater may flow into the sea SE. It has a possible cross-sectional area.

  Thereby, the flowing water channel 52 is not branched on the upstream side, seawater does not flow out due to vibration generated in the pipeline formed by the branching, and seawater is prevented from being ejected from the discharge pit 51d. be able to.

  FIG. 7 shows a schematic diagram of another example of the cooling water channel of the seaside plant using the wave breakwater channel according to the present invention.

  The cooling water channel A6 shown in FIG. 7 introduces seawater into the first condenser Rwa, the second condenser Rwb, and the third condenser Rwc, and the first condenser Rwa. The 1st discharge piping 4a for discharging seawater from the 1st is connected to the 1st water discharge pit 51e. Further, the second discharge pipe 4b and the third discharge pipe 4c for discharging seawater from the second condenser Rwb and the third condenser Rwc are collectively connected to the second discharge pit 51f. ing.

  Then, seawater flows out from the first upstream flowing water channel 521e connected to the first water discharge pit 51e, and seawater flows out from the second upstream flowing water channel 521f connected to the second water discharging pit 51f. The first upstream fluid channel 521d and the second upstream fluid channel 521f merge at the junction 525 and are connected to the downstream fluid channel 522.

  At this time, it is preferable that the first upstream flow channel 521e, the second upstream flow channel 521f, and the relationship between them and the downstream flow channel 522 satisfy the relationship shown in Formula 2.

  The breakwater-type drainage channel 5F has three condensers, namely, a first condenser Rwa, a second condenser Rwb, and a third condenser Rwc. The flowing water channels are grouped into two systems, and it is difficult for the sea water to vibrate in the pipeline and prevent the sea water from flowing into the sea SE. In addition, it is possible to suppress a situation where the vibration of the seawater is amplified by resonance and the seawater overflows from the water discharge pit or damages the upstream flow channel.

  In the cooling water channel of each of the above embodiments, the seawater is distributed to the three condensers and exchanged with the steam in the condenser to return the seawater to the sea as an example. However, the present invention is not limited to this, and more condensers may be provided to distribute seawater to the condensers.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic of the nuclear power plant which is an example of the seaside plant which employ | adopts the wave-proof drainage channel concerning this invention. It is the schematic of an example of the water channel for cooling water of the seaside plant using the wave-proof type water discharge channel concerning this invention. It is the schematic of the other example of the water channel for cooling water of the seaside plant using the wavebreak type water discharge channel concerning this invention. It is the schematic of the further another example of the water channel for cooling water of the seaside plant using the breakwater type water discharge channel concerning this invention. It is the schematic of the further another example of the water channel for cooling water of the seaside plant using the breakwater type water discharge channel concerning this invention. It is the schematic of the further another example of the water channel for cooling water of the seaside plant using the breakwater type water discharge channel concerning this invention. It is the schematic of the further another example of the water channel for cooling water of the seaside plant using the breakwater type water discharge channel concerning this invention. It is the schematic of an example of the water channel for cooling water of the seaside plant using the conventional wave-proof type water discharge channel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake port 2 Intake pump 3 Introductory water channel 4 Drain piping 5 Wave-proof type water discharge channel 5A-5F Wave-proof type water discharge channel 51 Water discharge pit 51a-51c 1st-3rd water discharge pit 52 Flowing water channel 521a-521c 1st-1st 3 upstream flow channel 521d Pre-mix flow channel 522 downstream flow channel 53 Outlet A Cooling water channel A1 to A6 Cooling water channel PP Nuclear power plant At Reactor ST Steam turbine Rw Condenser Rwa to Rwc First to First 3 condenser SE sea

Claims (4)

In coastal plants that circulate and use seawater,
A water discharge pit for storing seawater circulating in the plant;
Connected to the discharge pit, an upstream flow channel into which the seawater flows,
A downstream flow channel for releasing seawater flowing from the upstream flow channel into the sea;
A water outlet connected to the downstream flow channel and returning the seawater flowing through the downstream flow channel to the sea;
A plurality of the water discharge pits are provided, and each upstream flow channel connected to each of the plurality of water discharge pits joins at one junction and is connected to the downstream flow channel,
The cross-sectional area of the horizontal cross section of the water discharge pit is S, the cross-sectional area of the upstream flow water channel in the direction perpendicular to the seawater flow line is s, and the downstream flow from the connection portion of the upstream flow water channel with the water discharge pit When the length to the junction with the water channel is L, the L · S / s values of the plurality of water discharge pits and the upstream flow channels connected to the water discharge pits are the same value. Wave-type spillway. In coastal plants that circulate and use seawater,
A water discharge pit for storing seawater circulating in the plant;
Connected to the discharge pit, an upstream flow channel into which the seawater flows,
A downstream flow channel for releasing seawater flowing from the upstream flow channel into the sea;
A water outlet connected to the downstream flow channel and returning the seawater flowing through the downstream flow channel to the sea;
A plurality of the water discharge pits are provided, and at least two of the upstream flow channels connected to the plurality of water discharge pits are pre-merged at one first junction and connected to the pre-combined flow channel. And the other upstream flowing water channel and the pre-combined flowing water channel merge at one second merging portion and connected to the downstream flowing water channel,
The cross-sectional area of the horizontal cross section of the discharge pit is S, the length of the upstream flow channel that merges with the first merge portion is L1, the cross-sectional area is s1, and the length of the upstream flow channel that merges with the second merge portion If the length is L2, the cross-sectional area is s2, the length of the pre-combined flow channel is L3, and the cross-sectional area is s3,
The values of S · (L1 / s1 + L3 / s3) of the upstream flow channels that merge with the first merge portion have the same value, and the S · of each of the upstream flow channels that merge with the second merge portion. A wave breakwater discharge channel characterized in that the value of L2 / s2 is the same as the value of S · (L1 / s1 + L3 / s3) of the upstream flow channel that joins the first junction. In coastal plants that circulate and use seawater,
A water discharge pit for storing seawater circulating in the plant;
Connected to the discharge pit, an upstream flow channel into which the seawater flows,
A downstream flow channel for releasing seawater flowing from the upstream flow channel into the sea;
A water outlet connected to the downstream flow channel and returning the seawater flowing through the downstream flow channel to the sea;
A plurality of the water discharge pits are provided, and each upstream flow channel connected to each of the plurality of water discharge pits joins at one junction and is connected to the downstream flow channel,
Each upstream flow channel connected to the plurality of discharge pits has the same length from the connection portion with the discharge pit to the junction with the downstream flow channel. . A coastal plant comprising the wave-break water discharge channel according to any one of claims 1 to 3 .

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