JP2985628B2 - Operation method of seawater cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a cooling water system such as a condenser cooling system or an auxiliary cooling system of a power plant, and particularly to preventing marine organisms from adhering when using seawater as cooling water. The present invention relates to a method of operating a cooling water system of a power plant that can perform the operation.

[0002]

2. Description of the Related Art In facilities that cool condensers and auxiliary coolers of power plants with seawater, marine organisms adhere to and grow on equipment and pipes, which block pipes and equipment and reduce water transmission. However, there has been a problem that the performance of the heat exchanger is reduced due to a decrease in the amount of seawater, and the original cooling capacity cannot be obtained.
For this reason, it was necessary to perform an operation for removing marine organisms. In particular, when the piping becomes long, this marine organism removal operation has been long and the operation cost has been high.

As a measure to prevent marine organisms from adhering to the cooling water pipes, it is necessary to supply hot water to a seawater circulation system such as a condenser or an auxiliary cooler to suppress the inhabitation of marine organisms. 163
This is known from Japanese Patent No. 40 gazette.

In a conventional apparatus, a hot water circulating system is a device for supplying high-temperature water to a seawater circulating system, and is provided so as to connect an inlet side of the circulating water system to an outlet side of the circulating water system. Consisting of a pump for The heating device is a device that heats seawater to a set temperature during hot water circulation operation, and the hot water circulation pump is a device that forcibly supplies hot water, and circulates hot water in the hot water circulation system, seawater circulation system, and auxiliary system. Can be. When the plant is shut down, marine life in the seawater circulation system is removed by operating this hot water circulation system.

A similar technique is disclosed in Japanese Patent Application Laid-Open No. 55-17016.
There is one described in Japanese Patent Publication No.

[0006]

In the above prior art, there is a gap between the cold seawater filled in the circulating water pipe before the hot water circulation operation and the high-temperature water injected from the hot water circulation system by starting the hot water circulation operation. There is a large difference in temperature, and the incomplete mixing causes a density difference in the hot water circulating in the pipe, forming a temperature layer, and there is a concern about the survival of marine organisms in the cold water layer.

[0007] The flow rate of the hot water circulation pump is about one-third of the amount of water retained due to its economy, and the flow velocity in a relatively large-diameter pipe such as a seawater circulation pipe is very slow. For this reason, it is expected that delay in temperature uniformization and stagnation of the cold water layer will occur.

[0008] An object of the present invention is to focus on the problem of the formation of a temperature layer in the circulating hot water flow, and to make the circulating water temperature uniform at an early stage to eliminate the cold water layer and to obtain an appropriate marine organism removing effect. An object of the present invention is to provide a method of operating a cooling water system of a plant.

Another object of the present invention is to provide a seawater cooling system capable of effectively preventing sea organisms from adhering to equipment and piping of all seawater cooling system equipment using seawater including a circulating water main pipe as cooling water . It is to provide an operation method.

[0010]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In addition, the method of operating the seawater cooling system of the present invention includes a condenser and a circulation system.
Power generation consisting of multiple units with a water pump
Operation method of seawater cooling system in turbine equipment of plant
Under the law, seawater cooling of a specific unit that stopped generating power
A system to discharge cooling water remaining in the system for the system
Cooling through the connecting pipe connected from the other shaft during power generation
Water supply step, rising by a pump provided on the connecting pipe
After cooling, the cooling water is heated to the
The process of turning into water, and then the seawater cooling system of the shell removal target unit
Of warm water into the system, filling the system with warm water and
Holding for a considerable amount of time leading to lethality
It is characterized by shell removal in the line.

Also, the method for operating the seawater cooling system of the present invention.
Are multiple units with condensers and circulating water pumps
Water in turbine equipment of a power plant composed of
In the operation method of the cooling system, the specific
Cooling remaining in the knitted seawater cooling system
Process of draining water, communication from other shafts during power generation
Supplying cooling water via a pipe,
Up to the lethal temperature of marine organisms after boosting pressure with the installed pump
The process of heating the cooling water to make it hot water, and then removing the shellfish
Introducing hot water to the seawater cooling system of
Over a considerable period of time leading to
Circulating hot water with a pump
It is characterized by the following.

Further, the seawater cooling system is filled with hot water to supply
Hot water remaining in the seawater cooling system after lethal matter
Is discharged via a connecting pipe from the other axis during power generation.
Replaces warm water with cooling water by supplying cooling water
It is desirable.

Further, hot water in the system is passed through a bypass flow path.
It is desirable to discharge gradually.

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

As described above, in the facility for cooling with seawater as in the present invention, marine organisms adhere to pipes and equipment, further grow and block pipes and equipment, and the amount of water supplied by the pump decreases. The problem is gone. For this reason,
It is not necessary to discharge the seawater in the facility when the power plant stops to remove the sea creatures in order to remove the sea creatures.
If the piping of the circulating water main pipe becomes long (some examples are about 1 km), this marine organism removal operation takes a long time and is expensive, but the present invention could avoid it.

Further, the problem that the performance of the heat exchanger is reduced and the original cooling capacity is reduced can also be prevented, because the marine organisms adhere to the pipes and the equipment, and the fluid resistance increases and the flow rate decreases. As methods for preventing the growth of sea organisms, there have been known a chemical injection method, a hot air blowing method, a method in which heated seawater at a condenser outlet is returned to an auxiliary cooling seawater system and recirculated, and a ball washing method. Can be combined with the present invention.

The operation and principle will be described below.

[0032]

According to the present invention, in a method for supplying hot water to the seawater circulation system and suppressing the inhabitation of marine organisms, a high marine organism removal effect can be obtained by equalizing the temperature of the circulation hot water in the seawater circulation system piping. . Further, by making the temperature of the circulating water uniform, the temperature difference in the upper and lower portions of the horizontal wall of the seawater circulation system piping can be eliminated, and the influence of the thermal stress on the piping and the effect on the lining can be reduced.

[0033]

[0034]

[0035]

In the present invention, attention is paid to a heat treatment method in which marine organisms do not adhere to the walls of equipment and piping under high-temperature water, and hot water having a large specific heat is supplied to kill marine organisms. For example, it is known that marine organisms are killed in a few hours in an atmosphere at 35 ° C, and killed in tens of minutes in an atmosphere at 40 ° C.

By the way, two methods can be considered as a method of supplying hot water. That is, a method and an apparatus for replacing cold water in equipment and piping with hot water by injecting hot water from one end of the pipeline and simultaneously discharging cold water from the other end while the equipment and piping are filled with cold water.・ This method is to inject warm water after draining cold water in the pipe.
In the present invention, in order to enable the application of the heat treatment method to the entire system to the seawater cooling system including a large diameter and long circulating water main pipe,
Technical means. The reason is described below.

In the method of injecting hot water, due to buoyancy, hot water fills only the upper part of the pipe and cold water in the lower part remains without being replaced with hot water, so that sea organisms can live in the lower part of the pipe. There is. It is considered that the phenomenon in which hot water and cold water are separated in the height direction becomes remarkable because the flow velocity at the time of replacement becomes smaller in a large-diameter pipe such as a circulating water mother pipe.

When the above method is applied to a system in which parallel circuits having a large difference in the flow resistance coefficient of the pipeline coexist, for example, a combination of a condenser cooling system and an auxiliary cooling water system, the flow resistance coefficient is large. It is expected that hot water is not supplied sufficiently to the circuit and the shell removal effect is not sufficient. Further, in the method, since there is a mixture of cold water and hot water,
There is a disadvantage that it takes time to raise the water temperature at the end of the system (the outlet of the cold water). In addition, according to a numerical simulation result of continuously injecting hot water of 50 ° C. from one end of the circulating water mother pipe and discharging cold water from the other end, in order to raise the water temperature at the end of the pipeline to the shellfish lethal temperature, for example, 40 ° C., It can be seen that 1.5 times the amount of hot water required for the pipeline is required. As a result, when the water content of the system is large, it takes a long time to obtain a sufficient shelling effect (see FIG. 13).

On the other hand, it is clear that the above method does not have the above problem. In particular, in the method (2), since the pipe is hollow, the injected hot water quickly spreads to the end of the system. Further, since the required amount of hot water is equal to the amount of water retained in the pipeline, the required amount of hot water is smaller than that of the above method. As a result, in the present invention, a required shell removal effect can be obtained in a short time with a small amount of warm water. This is a great advantage when the present invention is applied to a combined cycle power plant that is always started and stopped every day in response to fluctuations in power demand.

[0041]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the present invention will be described with reference to FIG. 1, but before that, a basic "method of preventing marine organisms from adhering by circulating hot water" will be described.

In FIG. 1, a hot water circulation system 101 is provided so as to connect a circulation water system inlet side 109 and a circulation water system outlet side 110, and includes a heating device 103 and a hot water circulation pump.
Consists of 102. When the plant is stopped, the seawater system inlet valve 114 and the seawater system outlet valve 115 are closed, and the hot water outlet valve 10 is closed.
4 and the circulating water inlet valve 105 are opened to heat the seawater 1
The heated water is supplied to the seawater circulation system 108 by the hot water circulation water supply device 102, and the warm water is circulated to suppress the inhabitation of marine organisms.

The circulation range of the hot water is the seawater circulation system from the seawater system inlet valve 114 to the seawater system outlet valve 115 via the heat exchanger 113. There are various ways to operate the "Prevention of marine organisms from adhering to the seawater by hot water circulation". There are various ways to operate the system, but this example assumes that the power plant will be operated during weekend shutdowns.

Before stopping the circulating water pump when the power plant is stopped on the weekend, first, the hot water outlet valve 104 and the circulating water inlet valve 105 are opened to fill the hot water circulating system 101 with seawater and fill with water. Thereafter, the seawater system outlet valve 115 and the seawater system inlet valve 14 are closed while adjusting the circulating water pump flow rate in consideration of the closing pressure, and the plant is stopped while the seawater circulation system 108 is filled with seawater. Next, the hot water circulation system 10
By activating the hot water circulation pump 102, the hot water circulation system 101 to the seawater circulation system 108 to the hot water circulation system 1
01 and a heating device 103 in parallel.
And circulates warm water (50 ° C.). The heating is performed by supplying auxiliary steam to the heating device 103, and the heating device 103 produces hot water of 50 ° C. by supplying and mixing steam to the circulating water. In the circulating operation, after the warm water of 50 ° C. is filled in the cycle, the warm water is circulated by the warm water circulation water supply device 102 for one cycle.

The above-described configuration has been described in connection with a conventionally known basic "method for preventing marine organisms from adhering to water by circulating hot water".
Inside the hot water circulation cycle of the seawater circulation system 108, an appropriate position between the hot water injection point 106 on the circulation water system inlet side 109 and the heat exchanger inlet 111, and the circulating water extraction point 107 on the circulation water system outlet side 110. An auxiliary system 116 connecting an appropriate position between the heat exchanger outlets 112 is provided, and is specifically operated as follows.

First, the auxiliary system inlet valve 121 and the auxiliary system outlet valve 120 are opened at the time of filling with water before the plant stops, the auxiliary system 116 is filled with seawater, and the auxiliary system circulating pump 117 is operated in parallel during the hot water circulation operation. 11
A small circulation cycle of 6 to the seawater circulation system 108 to the auxiliary system 116 is formed. The flow rate in the auxiliary system 116 is increased to about 3 to 4 m / s by the auxiliary system circulation pump 117, and the circulating hot water is stirred by the auxiliary system outlet jet to make the temperature uniform.
In the initial stage of the hot water circulation operation, the auxiliary system 116 takes in the low-temperature circulating water from the auxiliary system inlet 119 at the circulating water system outlet 110 and injects it from the auxiliary system outlet into the high-temperature water at the circulating water system inlet 109 to reduce the circulating water temperature. Contributes to uniformity. In addition, the effect of stirring and mixing by the auxiliary system outlet water jet at the auxiliary system outlet 118 is obtained.

In the overall hot water circulation operation, high-temperature water at the auxiliary system outlet 118 and water flowing through the auxiliary system that rises in temperature in each small circulation cycle are mixed to supply circulating hot water having a relatively small temperature difference to the seawater circulation system 108. Thus, the temperature can be increased stepwise to suppress the formation of a temperature layer. Therefore, the temperature of the circulating hot water can be made uniform during operation of the "Prevention method of marine organism adhesion by hot water circulation", and the survival of marine organisms due to the occurrence and stagnation of a cold water layer can be suppressed. In addition, by controlling the auxiliary circulation pump 117 by detecting the temperature in front of the auxiliary system entrance, an effective and economical operation can be performed.

In the present invention, the auxiliary system 11 described above is used.
The effect of 6 can be obtained by using an existing system as an alternative as long as it is parallel to the seawater circulation system 108 without providing a special system. In the second embodiment, as the use of the existing system, FIG. 2 shows the uniformization of the circulating hot water temperature during the operation of the "seawater creature adhesion prevention method by hot water circulation", focusing on the presence of the ball washing system 116a in the condenser 113a. It will be described using FIG.

In FIG. 2, a ball washing system 116a is a system parallel to the seawater circulation system 8 connecting a ball injection pipe 118a on the condenser inlet side 111a and a ball collector 119a on the condenser outlet side 112a. Circulation pump 11
7a, a ball collecting machine, and various valves. The ball washing apparatus injects sponge balls into the seawater circulation system 108 from the ball injection pipe 118a by introducing circulating water into the ball washing system 116a by the ball circulation pump 117a during plant operation, and sponge balls into the condenser cooling pipe. Through the ball circulation pump 117a, the balls pass from the ball collector 119a through the ball cleaning system 116a, and then into the seawater circulation system 1 again.
08.

The ball washing system 116a is provided in parallel with the seawater circulation system 108, introduces seawater from the seawater circulation system 108, and has a circulation pump called a ball circulation pump 117a. In order to satisfy the above-described configuration of the auxiliary system 116 such as taking in the circulating water and injecting it into the circulating water system inlet side 109 and that the flow velocity in the ball cleaning system is usually about 3 m / s, a ball cleaning system 116a is provided. In such a plant, it is possible to use the existing ball washing system 116a like the auxiliary system 116, and to operate an effective "seawater creature adhesion prevention method by hot water circulation".

Third Embodiment Referring to FIG. 3, a description will be given of the uniformization of the temperature of the circulating hot water during the operation of the "prevention method of marine organism adhesion by hot water circulation" using the existing auxiliary cooling system as the third embodiment. The seawater circulation system 108 includes an accessory cooling system 116b. The auxiliary cooling system 116b is a system parallel to the condensate cooling system 108b that branches off from the condenser inlet side 111b and joins at the condenser outlet side 112b, and has a heat exchanger 122 for cooling auxiliary cooling water and a booster pump 117b. And various valves. Auxiliary equipment cooling system 1
Reference numeral 16b denotes a system for cooling the cooling water used for cooling the plant auxiliary equipment by the heat exchanger 122 with seawater. During operation of the plant, seawater is taken into the system from the condenser inlet side 111b by operating the booster pump 117b. After heat exchange in the exchanger 122, the heat is discharged to the condenser outlet side 112b. Here, the hot water injection point 106 of the hot water circulation system 101 is provided on the circulation water system outlet side 110, and the circulating water extraction point 107 is provided on the circulation water system inlet side 109.
6 plays the role of the auxiliary cooling system 116b, and the auxiliary system circulating pump 117 plays the role of the booster pump 117b.

By operating the booster pump 117b during the operation of the "prevention of marine organisms from being adhered to by hot water circulation", a small cycle of the auxiliary cooling system 116b to the condensate cooling system 108b to the auxiliary cooling system 116b is formed. Example 1 A stimulus to the circulation of hot water can be provided to make the temperature of the circulation water uniform.
The same effect can be obtained.

In addition, the flow rate of the pressurizing pump 117b is larger than the flow rate of high-temperature water generated by the hot water circulation pump 102. At the beginning of hot water circulation operation, the auxiliary equipment cooling system outlet
The mixing temperature of the high-temperature water and the water flowing through the auxiliary cooling system at 118b is lower than the flow ratio due to the water flowing through the auxiliary cooling system, so that the temperature rise per cycle can be reduced and consumed per cycle. The temperature of the circulating hot water rises smoothly because the heating time is short.

In all of the above embodiments, the hot water injection point in the hot water circulation system and the nozzle shape of the auxiliary system outlet in the auxiliary system are shaped so as to cause a swirling flow in the seawater circulation pipe as shown in FIG. A more effective mixing and agitation can be realized by using a downward blowing in consideration of an upward transition due to a difference in density of high-temperature water discharged at a point.

Further, in all the above embodiments, as shown in FIG. 5, by providing a plurality of nozzles at the hot water circulation point in the hot water circulation system and the auxiliary system outlet in the auxiliary system at arbitrary intervals, the mixing / stirring effect on the downstream side is achieved. The formation of a temperature layer due to the decay of water and the passage of time can be prevented, and more effective mixing and stirring of circulating hot water can be realized.

An embodiment of the present invention will be described with reference to FIG.

This embodiment shows a case where the present invention is applied to a condenser cooling system composed of two systems.

The seawater pumped by the circulating water pumps 1a and 1b passes through the pump outlet valves 2a and 2b, and the condensers 4a and 4b through the condenser inlet cooling water pipes 3a and 3b.
Water is sent to The turbine exhaust is cooled by the condensers 4a and 4b, and the heat-exchanged seawater is returned to the condenser outlet cooling water pipes 5a and 5b.
5b is passed to the water discharge channel 7 through the water and discharged to the sea.
Condenser outlet valves 6a and 6b are disposed in the middle of the condenser outlet cooling water pipes 5a and 5b.
With a and 2b, it is possible to isolate the system from the sea and form a target area for removing marine organisms by hot water. The cooling water can be extracted from any condenser cooling system by switching the valves from downstream of the circulating water pump outlet valves 2a and 2b.
The water extraction pipes 9a and 9b provided with the water extraction valves 8a and 8b are installed. The water extraction pipes 9a and 9b join at the inlet side of the hot water circulation pump 11. The outlet water of the hot water circulation pump 11 is the hot water production device 1
2 through the hot water circulation pipes 10, 10a, and 10b to switch the hot water intake valves 14a and 14b, and the condenser 4a
Alternatively, the cooling water pipes 5a and 5b at the outlet 4b can be injected. Removal of marine organisms by hot water in the condenser cooling water system having such a configuration is performed by the following method. The condenser cooling system during normal operation in the power plant having the above-described configuration draws seawater by the circulating water pumps 1a and 1b and pressurizes the seawater, and supplies the condenser inlet cooling water pipes 3a and 3b via the pump outlet valves 2a and 2b. Thus, water is sent to the condensers 4a and 4b. The cooling water that has exited the condensers 4a and 4b is discharged to the water discharge channel 7 through the condenser outlet cooling water pipes 5a and 5b and the condenser outlet valves 6a and 6b, and is discharged to the sea. At this time, the hot water circulating system including the hot water circulating pump, the hot water producing device, and the piping facility closes the water extraction valves 8a, 8b and the injection valves 14a, 14b to a standby state. In shifting from this state to hot water circulation, first, the condenser cooling system to be subjected to hot water circulation is stopped. Here, an example in which hot water circulation is performed for the b-side condenser cooling system will be described. Normally, when the condenser cooling water system is stopped, cooling water is held in the system in consideration of the water filling time at the next startup. That is, after the circulating water pump is stopped, the pump outlet valve 2b is closed, and the condensate outlet valve 6b is closed, thereby preventing the condenser 4b from falling. However,
If the condenser cooling water system is not stopped by the above operation, the pump outlet valve 2b, the condenser outlet valve 6
b may be closed. In the case of the present example, the cooling system formed by the circulating water pump outlet valve 2b and the condenser outlet valve 6b is targeted, and the cooling water (seawater) in the system is first discharged at the time of hot water circulation. In this case, all or selected valves of the condenser cooling system (vent valve and drain valve (not shown)) are opened and discharged. However, depending on the system level relationship (when the condenser cooling system piping level is higher than the water intake surface level and the water discharge channel 7 water level), opening the condenser outlet valve 6b or the pump outlet valve 2b causes the discharge channel to open. It is also possible to discharge to head 7 or the intake side by a hydrostatic head difference. It is also possible to install a drainage pump in the low-level piping section of the condenser cooling water system and to forcibly discharge the water by the pump.
In this way, the condenser cooling water system stopped while discharging the cooling water in the marine organism removal target system is the circulating water pump 1
b, the pump outlet valve 2b is closed, and the condenser outlet valve 6b is closed. Next, the circulating water pump discharge cooling water during operation is branched from the downstream side of the pump outlet valve 2a of the a-side condensate cooling system in the normal operation state, the water extraction valve 8a is opened, and the cooling water is guided to the hot water circulation pump 11, and the hot water circulation The pressure is increased by the pump 11, the water is passed to the hot water production device 12, and the temperature is increased to a water temperature at which marine organisms are lethal. By opening the hot water injection valve 14b, the seawater heated by the hot water production device 12 condenses the b-type condenser cooling water system formed by the pump outlet valve 2b and the condenser outlet valve 6b. It is introduced into the vessel outlet pipe 5b. The hot water introduced into the condenser cooling water pipe discharges air from a vent valve (not shown) provided at the top of the condenser 4b or in the cooling water pipe, and condensate water at the condenser inlet cooling water pipe 3b. It fills the cooling water pipe 5b and the condenser 4b at the outlet. If the b-side condenser cooling water system formed by the pump outlet valve 2b and the condenser outlet valve 6b is filled with hot water by the above operation, b
The water extraction valve 8b installed in the water extraction pipe 9b branched from the condenser inlet pipe 3b of the side condenser cooling water system is opened, and then the condenser inlet pipe 3a of the normal operation side (a side) condenser cooling water system.
Closes the water extraction valve 8a installed in the water extraction pipe 9a branched from, and shifts to the hot water circulation operation of the b-side condenser cooling system. By operating for a certain period of time in the above situation, it becomes possible to remove or prevent marine organisms in the condenser cooling water system.

In the present embodiment, the condenser cooling water system is described. However, according to the present embodiment, the auxiliary cooling water system by seawater of the power plant and the combination of the condenser cooling water system and the auxiliary cooling water system are used. It is possible to respond. Further, in the present embodiment, the condenser cooling water system composed of two systems has been described, but a case where the system is composed of a plurality of systems of two or more systems can be similarly handled. Furthermore, in the present embodiment, a hot water production device is arranged on the hot water circulation pump discharge side,
It may be on the inlet side of the pump. Further, in the present embodiment, for the pipes and condensers to be removed of marine organisms, after being filled with hot water, a circulation operation is performed such that the temperature of the marine organisms is lethal to the dead water temperature by the hot water production device.
The condenser cooling water pipe of a power plant is generally a large-diameter pipe (diameter: about 1.5 m to 4 m). When filled with hot water, the heat capacity of the hot water greatly exceeds the heat capacity of the pipe.
In addition, since the specific surface area (= surface area of the pipe / volume in the pipe) is small, it is considered that the temperature of the hot water does not decrease much due to heat radiation.
As a result, the operation does not shift to the hot water circulation operation,
Sufficient effects can be expected by holding for a certain period of time. In this case, the hot water circulation pump can be eliminated if the pressure for pushing the seawater into the hot water production device is secured. Furthermore, according to the present embodiment, since the hot water is injected into the condenser outlet pipe, the flow of the cooling water in the condenser flows in the opposite direction to the normal and circulates, so that the normal condenser cooling Although the same effect as the backwashing operation performed in the water system can be expected, it is needless to say that the hot water may be circulated in a path opposite to the present embodiment.

Next, another embodiment is shown in FIG.

The embodiment shown in FIG. 7 is characterized in that the cooling water at the outlet of the operating side condenser is injected into the condenser inlet side by a hot water circulating pump and is filled with water as compared with the embodiment shown in FIG. .

The cooling water systems of the condensers 4a and 4b have the same configuration as the embodiment of FIG. Water extraction valves 8a, 8b so that cooling water can be extracted from an arbitrary condenser cooling system by switching valves from the condenser cooling water pipes 5a, 5b at the condenser 4a, 4b outlets.
The water extraction pipes 9a and 9b provided with are provided.

The water extraction pipes 9a and 9b join at the inlet side of the hot water circulation pump 11. The outlet water of the hot water circulation pump 11 is supplied to the hot water circulation pipes 10, 10a, and 10b through the hot water production device 12.
By switching the hot water injection valves 14a, 14b via the, the cooling water pipes 5a, 5b can be injected into the condenser 4a or 4b outlet cooling water pipes. Removal of marine organisms by hot water in the condenser cooling water system having such a configuration is performed by the following method. The condenser cooling system of the normal operation in the power plant having the above-described configuration draws seawater by the circulating water pumps 1a and 1b and boosts the pressure of the seawater, and by the condenser inlet cooling water pipes 3a and 3b through the pump outlet valves 2a and 2b. Water is sent to the condensers 4a and 4b. The cooling water that has exited the condensers 4a and 4b is discharged to the water discharge channel 7 via the condenser outlet cooling water pipes 5a and 5b and the condenser outlet valves 6a and 6b, and is discharged to the sea. At this time, the hot water circulating system including the hot water circulating pump 11, the hot water producing device 12, and the piping equipment is connected to the water extraction valves 8a and 8b and the injection valves 14a and 14a.
14b is fully closed to enter a standby state. In shifting from this state to hot water circulation, first, the condenser cooling system to be subjected to hot water circulation is stopped. Here, an example in which hot water circulation is performed for the b-side condenser cooling system will be described. Normally, when the condensate cooling water system is stopped, consider the water filling time at the next startup,
The cooling water is retained in the system. That is, after the circulating water pump 1b is stopped, the pump outlet valve 2b is closed and the condenser outlet valve 6b is closed to prevent water from flowing from the condenser 4b. However, if the condenser cooling water system is not stopped by the above operation, the pump outlet valve 2b,
The condenser outlet 6b may be closed. In the case of this example, the cooling system formed by the circulation pump outlet valve 2b and the condenser outlet valve 6b is targeted, and the cooling water (seawater) in the system is first discharged during hot water circulation. In this case, all or all of the condenser cooling system valves (vent valves and drain valves not shown) are selectively opened, and discharge is performed. However, system level relation
(The piping level of the condenser cooling system is
Depending on the water level, the condenser outlet valve 6b and / or the pump outlet valve 2b may be opened to discharge water to the water discharge channel 7 or the intake side due to a head difference. It is also possible to install a drainage pump in the low-level piping section of the condenser cooling system and to forcibly discharge the water by the pump. In this way, the condenser cooling water system stopped while discharging the cooling water from the marine organism removal target system is in the state where the circulating water pump 1b is stopped, the pump outlet valve 2b is closed, and the condenser outlet valve 6b is closed. Become. Next, the water extraction valve 8a installed in the water extraction pipe 9a branching from the downstream of the condenser 4a of the a-side condenser cooling system during normal operation is opened, and the operating circulating water pump discharges to the hot water circulating pump 11. The cooling water is guided, the pressure is increased by the hot water circulation pump 11, and the cooling water is passed to the hot water production device 12,
The temperature of the marine life rises to the water temperature at which it is fatal. The seawater heated by the hot water production device 12 is supplied to the pump outlet valve 2b and the condensate outlet valve 4b by opening the hot water injection valve 14b.
B condenser condenser cooling water system condenser inlet pipe 3 formed by
b. The hot water introduced into the condenser cooling water pipe is extracted with air from a vent valve (not shown) installed at the top of the condenser 4b or in the cooling water pipe, and the condenser inlet cooling water pipe 3b is condensed. Outlet cooling water pipe 5b and condenser 4
b. When the b-side condenser cooling water system is filled with hot water by the above operation, the water-extraction valve 8b installed in the water-extraction pipe 9b branched from the condenser outlet pipe 5b of the b-side condenser cooling water system is opened, and the normal operation is performed. Closes the water extraction valve 8a installed on the water extraction pipe 9a branched from the water condensing outlet pipe 5a of the condenser water cooling system on the side (a side), and switches to extract water from the condenser cooling system on the b side, and circulates hot water again. The hot water circulation operation of the cooling water system for the b-side condenser is introduced by being introduced into the pump 11.

The present embodiment is characterized in that in the water filling operation with hot water for hot water circulation, the water source is extracted from the operating-side condenser outlet water. Normally, the condenser outlet cooling water in which the turbine exhaust is condensed by heat exchange in the condenser rises by about 5 to 7 ° C. with respect to the condenser inlet cooling water and is discharged to the sea. Therefore, in contrast to the embodiment of FIG. 6 in which the condenser inlet cooling water is heated to the lethal water temperature of marine organisms by the hot water producing device, the temperature of the seawater is increased by 5 to 7 ° C. It is possible to reduce the capacity of the hot water producing apparatus. Also,
In the case of the present embodiment, since the condenser outlet water is extracted, it does not affect the cooling capacity of the operating condenser, and at the maximum, the entire amount can be extracted and used as a hot water source. is there. FIG. 8 shows still another embodiment.

This embodiment is different from the embodiment shown in FIG. 6 in that the cooling water at the outlet of the operating side condenser is injected into the condenser cooling water pipe through the hot water circulation pump 11 and the hot water producing device 12 to cool the condenser. It is characterized by filling the inside of equipment such as pipes and condensers.

The cooling water systems of the condensers 4a and 4b have the same configuration as the embodiment of FIG.

The condenser inlet cooling water pipes 3a, 3b downstream of the pump outlet valves 2a, 2b and the hot water circulation pump 11 inlet pipe 9
Are connected and connected via pipes 20a and 20b via valves 19a and 19b. At the outlet of the hot water circulation pump 11, a hot water producing device 12 is arranged, and the hot water producing device outlet pipe 10 is provided.
And the condenser outlet valves 6a, 6b and the upstream condenser outlet cooling water pipes 5a, 5b are connected to the valves 18a, 18b, the valves 15a, 15b.
And are connected by pipes 16a and 16b. Further, pipes 16a and 16b connecting the valves 15a and 15b and the valves 18a and 18b, and a hot water circulating pump 11 inlet pipe 2
A pipe 21 having valves 17a and 17b
a, 21b. Removal of marine organisms by hot water in the condenser cooling water system having such a configuration is performed by the following method. The condenser cooling system during normal operation in the power plant having the above-described configuration includes the circulating water pump 1a,
1b, the seawater is taken up and pressurized, and the condenser 4 is condensed by the condenser inlet cooling water pipes 3a, 3b via the pump outlet valves 2a, 2b.
a, 4b. The cooling water that has exited the condensers 4a and 4b is discharged to the water discharge channel 7 through the condenser outlet cooling water pipes 5a and 5b and the condenser outlet valves 6a and 6b, and is discharged to the sea. At this time, the hot water circulating system side including the hot water circulating pump 11, the hot water producing device 12, and the piping equipment is connected to the valves 19a, 19
b, the valves 15a and 15b are fully closed to be in a standby state. In shifting from this state to hot water circulation, first, the condenser cooling system to be subjected to hot water circulation is stopped. here,
An example in which hot water circulation is performed for the b-side condenser cooling system will be described. Normally, when the condenser cooling water system is stopped, cooling water is held in the system in consideration of the water filling time at the next startup. That is, after the circulating water pump 1b stops, the pump outlet valve 2b closes and the condensate outlet valve 6b closes.
Prevents falling water from b. However, by the above operation,
When the condenser cooling water system is not stopped, the pump outlet valve 2b and the condenser outlet valve 6b may be closed after the cooling system is stopped. In the case of the present example, the cooling water system formed by the circulating water pump outlet valve 2b and the condenser outlet valve 6b is targeted, and the cooling water (seawater) in the system is first discharged at the time of hot water circulation. In this case, all or all of the condenser cooling system valves (vent valves and drain valves not shown) are selectively opened and discharged. However, depending on the system level relationship (when the condenser cooling water system piping level is higher than the intake water level and the water level of the discharge channel 7), the discharge of the water can be achieved by opening the condenser outlet valve 6b or the pump outlet valve 2b. It is also possible to discharge to the water channel 7 or the intake side by a hydrostatic head difference. Also,
It is also possible to install a drainage pump in the low-level piping section of the condenser cooling water system and forcibly discharge the water by the pump. In this way, the condenser cooling water system stopped while discharging the cooling water in the marine organism removal target system is stopped, the circulating water pump 1b is stopped, the pump outlet valve 2b is closed, and the condenser outlet valve 6b.
It is closed. Next, the process branches off from the upstream of the condenser outlet valve 5a of the a-side condenser cooling system that is in normal operation. Piping 16
The valve 15a installed on the valve a is opened, the valve 18a is closed, and the valve 17b is closed, the seawater of the a-side condenser cooling water system is passed through the pipe 16a, and the cooling water is guided to the hot water circulation pump 11 via the stop valve 17a. .
Next, the pressure is increased by the hot water circulation pump 11, and the water is passed to the hot water production device 12, and the temperature is raised to a water temperature at which marine life is lethal. The seawater heated by the hot water production device 12 is supplied to the pipe 16
When the valve b is opened, the valve 18b is opened and the valve 15b is opened to be introduced into the condenser outlet pipe 5b of the b-system condenser cooling water system formed by the pump outlet valve 2b and the condenser outlet valve 14b. . The hot water introduced into the condenser cooling water pipe is exhausted from a vent valve (not shown) provided at the top of the condenser or in the cooling water pipe, and the condenser inlet cooling water pipe 3b and the condenser outlet are discharged. The cooling water pipe 5b and the condenser 4b are filled. B formed by the pump outlet valve 2b and the condenser outlet valve 4b by the above operation
If the side condenser cooling water system is filled with hot water, a pipe branched from the condenser inlet pipe 3b of the b-side condenser cooling water system,
Open the valve 19b installed on the 20b, the pipe 1 branched from the condenser outlet pipe 5a of the condenser cooling water system on the normal operation side (a side)
6a. The valves 15a and 17a are closed, and the hot water filled with the condenser cooling water system is introduced again into the hot water circulation pump 11 through the valve 19b pipe 2b, and the operation shifts to the hot water circulation operation of the b-side condenser cooling water system. . By operating for a certain period of time under the above-described conditions, removal or prevention of marine organisms in the condenser cooling water system becomes possible.

According to the embodiment, since the hot water is injected into the condenser outlet pipe, the hot water flows in the condenser in the opposite direction to the normal flow of the cooling water and circulates therethrough. It has the same effect as the backwash performed in the above, and also increases the temperature of the condenser outlet cooling water (water temperature about 5 to 7 ° C higher than the inlet water), so the capacity of the hot water production device can be reduced. Becomes

In general, the distance from the circulating water pump to the condenser outlet valve is generally long. However, when this embodiment is adopted and marine organisms are removed by keeping the water full with hot water, (When hot water circulation is not performed), valves 19a and 19
Since the pipes 20a and 20b containing b can be omitted, and the equipment can be configured near the condenser outlet valve, there is no need to install pipes near the circulating water pump, which is effective in reducing equipment costs.

FIG. 9 shows still another embodiment.

This embodiment is different from the embodiment shown in FIG. 6 in that the cooling water at the inlet of the operating side condenser is injected into the condenser inlet cooling water pipe via the hot water circulation pump 11 and the hot water producing device 12 to cool the condenser. It is characterized by filling the inside of equipment such as pipes and condensers.

The cooling water systems of the condensers 4a and 4b have the same configuration as the embodiment of FIG.

The condenser outlet valves 6a and 6b, the condenser outlet cooling water pipes 5a and 5b, and the hot water circulating pump 11 inlet pipe 9 are joined by pipes 20a and 20b via valves 19a and 19b. I do. At the outlet of the hot water circulation pump 11, a hot water producing device 12 is arranged, and the hot water producing device outlet pipe 10 is provided.
And the pump outlet valves 2a, 2b and the downstream condenser inlet cooling water pipes 3a, 3b are connected by pipes 16a, 16b via valves 18a, 18b and valves 15a, 15b in this order. Furthermore,
The piping connecting the valves 15a, 15b and the valves 18a, 18b and the inlet piping 9 of the hot water circulation pump 11 are connected to the valves 17a, 17
b and connected by pipes 21a and 21b. Removal of marine organisms by hot water in the condenser cooling water system having such a configuration is performed by the following method. The condenser cooling system at the time of the normal operation in the power plant having the above-described configuration draws seawater by the circulation pumps 1a and 1b and pressurizes the seawater, and by the condenser inlet cooling water pipes 3a and 3b through the pump outlet valves 2a and 2b. Water is sent to the condensers 4a and 4b. Condensers 4a, 4
The cooling water exiting from b is discharged to the water discharge passage 7 through the condenser outlet cooling water pipes 5a and 5b and the condenser outlet valves 6a and 6b, and discharged to the sea. At this time, the hot water circulating system side including the hot water circulating pump, the hot water producing device, and the piping equipment is connected to the valves 19a, 1
9b and the valves 15a and 15b are fully closed to be in a standby state. In shifting from this state to hot water circulation, first, the condenser cooling system to be subjected to hot water circulation is stopped. here,
An example in which hot water circulation is performed for the b-side condenser cooling system will be described. Normally, when the condenser cooling water system is stopped, cooling water is held in the system in consideration of the water filling time at the next startup. That is, after the circulating water pump 1a stops, the pump outlet valve 2b closes and the condenser outlet valve 6b closes.
Prevents falling water from b. However, by the above operation,
When the condenser cooling water system is not stopped, the pump outlet valve 2b and the condenser outlet valve 6b may be closed after the cooling system is stopped. In the case of this example, the cooling water formed by the circulating water pump outlet valve 2b and the condenser outlet valve 6b is targeted, and the cooling water (seawater) in the system is first discharged at the time of hot water circulation. In this case, all or all of the condenser cooling system valves (vent valves and drain valves not shown) are selectively opened and discharged. However, depending on the system level relationship (where the piping level of the condenser cooling water system is higher than the intake water level and the water level of the discharge channel 7), opening the condenser outlet valve 6b or the pump outlet valve may cause the discharge to occur. It is also possible to discharge to the water channel 7 or the intake side by a hydrostatic head difference. It is also possible by installing a discharge pump in the low-level piping of the condenser cooling water system and forcibly discharging the water by the pump.
In this way, the condenser cooling water system stopped while discharging the cooling water in the marine organism removal target system is the circulating water pump 1
b, the pump outlet valve 2b is closed, and the condenser outlet valve 6b is closed. Next, the valve 15a, the valve 18b, and the valve 17b installed on the pipe 16a branched from the downstream of the pump outlet valve 2a of the a-side condenser cooling system during normal operation are closed, and water is passed through the pipe 16a. Through the stop valve 17a, the hot water circulation pump 1
1 cooling water is led. Next, the pressure is increased by the hot water circulation pump 11, and the water is passed to the hot water production device 12, and the temperature is raised to a water temperature at which marine organisms are lethal. The seawater heated by the temperature production device 12 passes through the pipe 16b, and the valve 18b is opened and the valve 15b is opened.
It is introduced into the condenser inlet pipe 3b of the b-side condenser inlet cooling water system formed by the closed and pump outlet valve 2b and the condenser outlet valve 4b. The hot water introduced into the condenser cooling water pipe discharges air from a vent valve (not shown) provided at the top of the condenser or in the cooling water pipe, and discharges air from the condenser inlet cooling water pipe 3.
b, Fill the condenser outlet cooling water pipe 5b and the condenser 4b. If the b-side condenser cooling water system formed by the pump outlet valve 2b and the condenser outlet valve 4b is filled with hot water by the above operation, branching from the condenser outlet piping 5b of the b-side condenser cooling water system. The valve 19b installed on the pipe 20a is opened, and the valves 15a and 17a installed on the pipe 16a branched from the condenser inlet pipe 3a of the condenser cooling water system on the normal operation side (a side) are closed. , The hot water filled with the condenser cooling system
b, again introduced into the hot water circulation pump 11 via the pipe 20b, and the operation shifts to the hot water circulation operation of the b-side condenser cooling water system. By operating for a certain period of time under the above-described conditions, removal or prevention of marine organisms in the condenser cooling water system becomes possible. According to this embodiment, it is general that the distance from the circulating water pump to the condenser outlet valve is generally long. However, when marine organisms are removed by holding the water full with hot water (the hot water circulation is not performed). Case) Piping 20 including valve 19a and valve 19b
Since a and 20b can be eliminated and the equipment can be configured near the pump outlet valve, there is no need to install equipment piping near the circulating water condenser outlet, which is effective in reducing equipment costs.

FIG. 10 shows still another embodiment.

This embodiment differs from the embodiment of FIG. 6 in that the condenser inlet cooling water pipes 3a, 3b are connected to the circulating water pumps 1a, 1b.
A part of the discharged water is supplied to auxiliary cooling water coolers 23a, 23 of the power plant.
3b, the auxiliary equipment cooling water coolers 23a, 23
b, heat exchange is performed again, and then the condenser outlet cooling water pipe 5a,
A system for returning to 5b is added. According to this embodiment, the marine life can be removed from the condenser cooling system together with the condenser cooling system. In this way, the fluid flow path of piping and equipment that removes marine organisms by hot water is isolated and isolated from seawater using a partition mechanism such as a valve, so that it can be separated into piping, equipment, a single system, and multiple systems. Regardless, marine life can be removed with warm water.

FIG. 11 shows still another embodiment.

This embodiment is different from the embodiment shown in FIG. 6 in that, when the area to be subjected to marine life removal is filled with warm water, the water source is directly pumped from the sea by the pump 24 and supplied to the hot water circulation pump 11. It has a special feature. In this embodiment, the method up to the discharge of seawater from the marine life removal target area is the same as that in the embodiment of FIG. Next, pump 2
4 is started to pump seawater and supply it to the hot water circulation pump 11 via the valve 25. Pressurized by hot water circulation pump 11,
Hot water is injected into the condenser outlet cooling water pipe 5 through the hot water production device 12 through the temperature raising / injection valve 14. By the above operation,
After filling the marine life removal area with hot water, the valve 25 is closed and the water extraction valve 8 is opened to shift to hot water circulation. Fig. 6
The same effect as that of the embodiment can be obtained. Also,
According to the present embodiment, since the water source of the injection hot water is directly taken from the sea by the pump, it can be adopted in a condenser cooling water system composed of one system.

FIG. 12 shows still another embodiment.

This embodiment is different from the embodiment shown in FIG. 6 in that the cooling water at the outlet of the operating side condenser is circulated through the hot water producing apparatus by the discharge pressure of the cooling system circulating pump through the marine organism removal system. After being supplied to the pump inlet and being filled with hot water, hot water circulation is performed by a circulating water pump.

At the inlets of the circulating water pumps 1a and 1b, valves 26a and 26b for forming a marine organism removal area (a partition mechanism for closing the intake channel) may be provided. Circulating water pumps 1a, 1b and condensers 4a, 4b are connected by condenser cooling water inlet pipes 3a, 3b to supply seawater.
Condenser outlet cooling water pipes 5a, 5b connected to outlets of the condenser outlet cooling water pipes 5a, 5b are provided with condenser outlet valves 6a, 6b. 5b, and the pipes 9, 9a, 9
b, and are connected to each other, so that the outlet of the hot water producing device 12 and the inlets of the circulating water pumps 1a, 1b
b. The marine organism removal method according to the present embodiment is as follows. First, similarly to the other embodiments, the operation of the condenser cooling system of interest is stopped (in this case, the condenser cooling system of the b-side).
b is closed and isolated, and the seawater retained in the isolated pipes, condensers and the like is discharged. Next, the valve 8a installed in the operation side condenser cooling water system is opened and introduced into the hot water production device 12,
The temperature is raised to the lethal temperature of the marine organism, and the valve 14b is opened to open the b
Supply hot water to the side condenser cooling water system. By the above,
After the isolated b-side condenser is filled with hot water in the cooling water system, the valve 8a is closed and the valve 8b is opened to stop supplying hot water. As described above, if a system for circulating hot water is formed, the circulating water pump 1b is started, and the circulating water pump shifts the circulation operation. According to this method, the same effect as the embodiment of FIG. 6 can be expected. Further, according to the embodiment, since the hot water circulation is performed by the circulating water pump 1b, the hot water circulating pump can be eliminated, and the equipment cost can be reduced.

In all of the above-described embodiments, when it is not possible to discharge cold water by a natural gradient, as in the case where the center position of equipment and piping is lower than the sea surface, the drainage operation is performed. Can be omitted and hot water can be injected.

FIG. 14 shows an embodiment in which means for forming a free liquid level is provided in the system. A vent valve 2 is provided at the top of the water chamber 31 of the condenser 4b which is the highest position in the vertical direction in the system.
7 is provided, and a vacuum break valve 28 is provided in a pipe 33 branched from the upstream side of the vent valve 27. The pipe 33 may be provided with a pressurizing line 38 for pressurizing the system as necessary. Pressure line 38
Has a pressurizer 30 and a stop valve 29. The above means has the following functions. At the stage of discharging the cooling water remaining in the seawater cooling system as a preparation before starting the hot water circulation, the outside air is introduced into the system by opening the vent valve 27 or the vacuum breaking valve 28 to use the gravity to supply the cooling water to the sea. Discharge. Instead, the vent valve 27 and the vacuum release valve 28 are closed, and the stop valve 29 is closed.
May be opened to cause the pressure of the pressurizer 30 to act on the water chamber 31. In this case, there is an effect that the discharge time can be reduced. When drainage is completed, the valve 8a is opened, cooling water is introduced from the other shaft during power generation, and the system is filled with warm water after being heated by the warm water production device. At this time, if the vent valve 27 and the vacuum breaking valve 28 are opened and the stop valve 29 is closed, the air in the system is discharged via these valves. According to the configuration of the present embodiment, the take-out point of the vent line 32 is at the highest position in the vertical direction in the system, so that the air in the system can be completely discharged. Valve 8 when filling with warm water is completed
Close a. Stop supplying hot water. At this time, if the open end of the vent line 32 is at a lower position in the vertical direction, a siphon is formed and no free liquid surface appears in the water chamber 31 unless the vacuum break valve 28 is present. If the hot water circulation pump 11 is started in this state, an effective pump suction pressure cannot be secured, so that the hot water circulation pump 11 generates cavitation, which makes it difficult to circulate hot water in the system. In order to avoid such a situation, it is sufficient to open the vacuum break valve 28 so that the outside air can be sucked in if the water chamber 31 becomes a negative pressure. At this time, a free liquid surface 30 is formed in the water chamber 31 where the upper part of the water surface is at atmospheric pressure, and an effective pump suction pressure can be secured. When it is desired to positively secure the suction pressure of the hot water circulation pump 11, after forming the free liquid level 30 in the water chamber 31 by the above-described valve operation, the vent valve 27 and the vacuum release valve 28 are closed, and the stop valve is stopped. 29 may be opened to pressurize the water chamber 31 and the entire hot water circulation target area. Next, in the process of circulating hot water in the system, it is necessary to have a configuration capable of absorbing volume shrinkage of water caused by a decrease in hot water temperature due to heat radiation from pipes and device surfaces.
In a typical example, a temperature drop of 1 ° C. causes the hot water volume of the system to shrink by 5 m ³ . At this time, if the water chamber 31 is not in communication with the outside air or in communication with the pressurizer, the pressure in the water chamber becomes negative, and the cavitation of the hot water circulation pump 11 may occur. Therefore, during circulation of hot water, it is necessary to open the vent valve 27 or the vacuum break valve 28 to form a free liquid surface at atmospheric pressure, or to open the stop valve 29 to pressurize the water chamber 31. .

FIG. 15 shows an embodiment in which a condenser outlet stop valve 6b is formed with a bypass passage 39 narrower than the circulating water main pipe 5b, and a water temperature detecting means 37 is provided downstream of the condenser outlet stop valve 6b. Show. The purpose of the formation of the bypass flow path 39 is to effectively discharge the used hot water to the outside of the system. Before describing the operation of this embodiment, the operation of discharging hot water according to the present invention will be described with reference to FIG. Attention should be paid to thermal wastewater from power plants from the viewpoint of protecting the marine environment. Thus, the rate at which spent hot water is discharged into the ocean is limited by this. After the hot water circulation is completed, first, the hot water circulation pump 11 is stopped, and the water extraction valve 8a from the other shaft during power generation is slightly opened to complete preparation for sending cooling water to the shaft. At this time, when the condenser outlet stop valve 6b is fully opened, the outflow speed of the hot drainage is high, so that cavitation may occur in the water extraction valve 8a and the valve may be damaged. In order to eliminate this, the condenser outlet stop valve 6b remains closed,
If the bypass passage 39 according to the present embodiment is used, the passage area of the bypass passage 39 is small, so that the bypass passage 39 becomes a resistor, and the outflow speed of the hot waste water can be reduced. If necessary, an orifice may be provided in the bypass flow passage 39 to share the differential pressure. By doing so, there is an effect that the water can be gradually drained while preventing cavitation at the valve, thereby protecting the marine environment. In this draining process, the vent flow rate can be finely adjusted by closing the vent valve 27 and the vacuum breaking valve 28 in FIG. Completion of the discharge of the hot water can be determined from the signal of the water temperature detecting means 37.
By closing a, and then closing the water extraction valve 8b and the water injection valve 14b, the shell removal operation can be completed.

FIG. 16 shows the liquid level detecting means 3 in the circulating water main pipe.
6 shows an embodiment in which 6 is provided.

As an operation before the system is filled with hot water, an operation of discharging cooling water in the system is performed. At this time, the remaining amount of the cooling water in the system is estimated by the means 36 for detecting the water level of the liquid surface 35 formed in the circulating water mother pipe. This produces an effect that the timing for ending the drainage operation can be appropriately set.

[0086]

As described above, according to the present invention, in a method for suppressing the inhabitation of marine organisms by supplying hot water, stirring and mixing are performed at a hot water injection point and at an appropriate point after the hot water injection point. By reducing the temperature difference of the circulating hot water, the formation of a temperature layer due to the density difference is suppressed, the stagnation of the cold water layer in the piping is eliminated, and the effective prevention of marine organisms from adhering and suppressing the inhabitation can be achieved.

According to the present invention, in removing marine organisms,
First, the seawater in the target area is discharged, and then the target area is filled with warm water.This makes it possible to fill the target area with uniform warm water. Effective for removal.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram of a third embodiment of the present invention.

FIG. 4 is a specific plan of a hot water injection point and an auxiliary system outlet nozzle shape.

FIG. 5 is a diagram showing a plurality of hot water injection points and auxiliary system outlets.

FIG. 6 is a diagram of a seawater cooling system shell removal apparatus for a power generation facility according to the present invention.

FIG. 7 is a diagram of a seawater cooling system shell removal apparatus for a power generation facility according to another embodiment of the present invention.

FIG. 8 is a diagram of a seawater cooling system shell removal apparatus for a power generation facility according to another embodiment of the present invention.

FIG. 9 is a diagram of a seawater cooling system shell removal apparatus for a power generation facility according to another embodiment of the present invention.

FIG. 10 is a diagram of a seawater cooling system shell removal apparatus for a power generation facility according to another embodiment of the present invention.

FIG. 11 is a diagram of a seawater cooling system shell removal apparatus for a power generation facility according to another embodiment of the present invention.

FIG. 12 is a diagram of a seawater cooling system shell removal apparatus for a power generation facility according to another embodiment of the present invention.

FIG. 13 is a diagram showing a change over time in water temperature at the end of a pipeline caused by continuous injection of hot water.

FIG. 14 is a diagram showing a means for forming a free liquid surface and a means for pressurizing the liquid surface in the seawater cooling system shell removal apparatus according to the present invention.

FIG. 15 is a diagram showing a bypass flow path of a condenser outlet stop valve in the seawater cooling system shell removal apparatus according to the present invention.

FIG. 16 is a view showing a water level detecting means in the seawater cooling system shell removal apparatus according to the present invention.

[Explanation of symbols]

101: Hot water circulation system, 102: Hot water circulation pump, 1
03: heating device, 104: hot water outlet valve, 105: circulating water inlet valve, 106: hot water injection point, 107: circulating water extraction point, 1
08 circulating water system, 108b condensate cooling system, 109
Circulating water system inlet side, 110: Circulating water system outlet side, 111: Heat exchanger inlet, 111a: Condenser inlet, 111b: Condenser inlet, 112: Heat exchanger outlet, 112a: Condenser outlet,
112b: condenser outlet, 113: heat exchanger, 113a: condenser, 113b: condenser, 114: seawater meter inlet valve, 115
... Sea water meter outlet valve, 116 ... Auxiliary system, 116a ... Ball washing system, 116b ... Auxiliary unit cooling system, 117 ... Auxiliary system circulation pump, 117a ... Ball circulation pump, 117b ... Boost pump, 118 ... Auxiliary system outlet, 118a ... Ball inlet, 118b: auxiliary cooling system outlet, 119: auxiliary system inlet, 119a: ball collector, 120: auxiliary system outlet valve, 121: auxiliary system inlet valve, 122: heat exchanger, 12
3 ... temperature detector, 124 ... temperature detector.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taiji Takeda 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Inside the Hitachi Plant (72) Inventor Yoshio Sumitani 3-1-1, Sachimachi, Hitachi-shi, Ibaraki No. 1 Hitachi, Ltd. Hitachi Plant (72) Inventor Toyoyuki Mukai 3-1-1 Kochicho, Hitachi City, Ibaraki Prefecture Hitachi, Ltd. Hitachi Plant (56) References JP-A-55-17016 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) F28G 13/00

Claims (4)

(57) [Claims] 1. A method of operating a seawater cooling system in a turbine plant of a power plant comprising a plurality of units having a condenser and a circulating water pump, wherein the method is applied to a seawater cooling system of a specific unit in which power generation is stopped. Discharging the cooling water remaining in the system, supplying cooling water via a connecting pipe connected from another shaft during power generation,
Heating the cooling water to a temperature equivalent to the lethal temperature of the marine organisms to make it hot water after increasing the pressure by a pump attached to the connecting pipe, and then guiding the hot water to the seawater cooling system of the unit for removing shellfish;
A method for operating a seawater cooling system, comprising the steps of: filling the inside of the system with hot water and maintaining the system for a considerable period of time until killing of marine organisms, and removing shellfish in the system. 2. A method of operating a seawater cooling system in a turbine plant of a power plant comprising a plurality of units having a condenser and a circulating water pump, wherein the method is applied to a seawater cooling system of a specific unit in which power generation is stopped. Discharging the cooling water remaining in the system, supplying cooling water via a connecting pipe connected from another shaft during power generation,
Heating the cooling water to a temperature equivalent to the lethal temperature of the marine organisms to make it hot water after increasing the pressure by a pump attached to the connecting pipe, and then guiding the hot water to the seawater cooling system of the unit for removing shellfish;
A method of operating a seawater cooling system, comprising: circulating hot water with a pump for a considerable period of time until the inside of the system is filled with hot water and killing marine organisms, and removing shellfish in the system. 3. The method for operating a seawater cooling system according to claim 1 or 2, wherein the seawater cooling system is filled with hot water to kill marine life, and then the hot water remaining in the seawater cooling system is discharged. At this time, a method of operating a seawater cooling system in which hot water is replaced with cooling water by supplying cooling water via a communication pipe from another shaft during power generation. 4. The method for operating a seawater cooling system according to claim 1, wherein the hot water in the system is gradually discharged via a bypass flow path.