JP2001228288A - Cooling water draining device for plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce total exhaust heat in cooling water drained from a plant to the sea. SOLUTION: A cooling water cooler 15 for discharging heat in the cooling water drained from the plant into the air and cooling the cooling water to exhaust into the sea is placed to reduce the total exhaust heat into the sea. For this purpose, the cooling water cooler 15 is constituted of a primary drainage canal 20 connected to the plant and a secondary drainage canal 21 which is placed in lower position than the primary drainage canal 20, receives cooling water from the primary drainage canal 20 and exhausts it into the sea. Thus when the cooling water flows down from the primary drainage canal 20 to the secondary drainage canal 21, the cooling water is cooled by directly exchanging heat with the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water discharge system for a plant which reduces the temperature of cooling water discharged to the sea from a thermal power plant, a combined power plant, a nuclear power plant, etc. so as to reduce the influence on marine life and the like. Related to the device.

[0002]

2. Description of the Related Art Conventionally, in a thermal power plant, a combined power plant, a nuclear power plant, etc., as shown in FIG. 7, steam generated in a steam generating facility 1 expands in a steam turbine 2 to generate mechanical energy. Generator 3 by
Is rotated to generate power.

[0003] The steam from the steam turbine 2 is led to a condenser 4, cooled by the cooling water in the condenser 4, condensed, and condensed. The steam is passed through a feed water heater 11 by a feed water pump 5. It is sent to the generating equipment 1 and turns into steam again.

[0004] A part of the steam supplied to the steam turbine 2 is bled and directly supplied to the feed water heater 11,
The water sent by the water supply pump 5 is heated.

[0005] As the cooling water supplied to the condenser 4, generally, seawater is used. The cooling water is pumped from a cooling water intake port 6 by a cooling water pump 7 and supplied to the condenser 4 through a cooling water intake pipe 8. You.

Then, the condenser 4 exchanges heat with steam,
The water is again discharged to the sea from the cooling water outlet 10 through the cooling water outlet 9.

At this time, the temperature of the cooling water discharged from the condenser 4 is about 7 ° C. higher than the temperature of the seawater at the time of taking in. It is said to have a bad effect on ecosystems such as living things, and is a major obstacle in the construction of power plants and the like.

As a countermeasure against such hot drainage, there is a method of suppressing an increase in the temperature of the cooling water by increasing the amount of cooling water in the condenser 4.

As shown in FIG. 8, a bypass pipe 12 is provided in parallel with the condenser 4, and the cooling water whose temperature has risen in the condenser 4 and the temperature from the bypass pipe 12 have not risen. There is a method of lowering the drainage temperature by combining the cooling water with the cooling water discharge passage 9 and draining the water.

Further, as shown in FIG. 9, there is a method in which deep seawater having a low temperature is taken in by a deepwater intake 13 and used as cooling water, and seawater whose temperature has been raised by a condenser 4 is drained from the sea surface. In this case, since the temperature of the seawater withdrawn is low, even if the temperature rises in the condenser, the temperature difference from the seawater temperature where many ecosystems exist is reduced, so that the influence on the ecosystem is reduced.

[0011]

However, although each of the above-mentioned methods can lower the temperature of the cooling water discharged to the sea, the total amount of heat discharged from the power generation plant to the sea is actually reduced at all. I haven't.

[0012] For this reason, it has become difficult to meet recent severe environmental standards and ecosystem conservation, and it is necessary to reduce the total amount of heat exhausted to the ocean itself.

Accordingly, an object of the present invention is to provide a cooling water drainage device for a plant, which can reduce the total amount of heat discharged to the sea.

[0014]

According to a first aspect of the present invention, a cooling water discharged from a plant is discharged to the atmosphere, and the cooling water is cooled and discharged to seawater. A cooling water cooling device is provided to reduce the total amount of heat discharged to the sea.

According to a second aspect of the present invention, a cooling water cooling device is provided at a lower position than the primary water discharge channel connected to the plant and receives the cooling water from the primary water discharge channel. And a secondary water discharge channel for draining water to the sea, and when the cooling water flows down from the primary water discharge channel to the secondary water discharge channel, the cooling water is directly exchanged with the atmosphere to be cooled and cooled. The exhaust heat quantity is reduced.

According to a third aspect of the present invention, the cooling water cooling device is provided at a lower position than the primary water discharge channel connected to the plant and receives the cooling water from the primary water discharge channel. A secondary water discharge channel for draining water, and a cooling tower for exchanging heat of the cooling water from the primary water discharge channel with the atmosphere.When the cooling water flows down from the primary water discharge channel to the secondary water discharge channel, the cooling water is discharged. It is characterized by cooling by exchanging heat with the atmosphere to reduce the total amount of heat discharged to the sea.

According to a fourth aspect of the present invention, a scatterer is provided between the primary water discharge channel and the secondary water discharge channel to scatter the cooling water flowing between the primary water discharge channel and the secondary water discharge channel to increase the efficiency of heat exchange with the atmosphere. The feature is that the cooling efficiency of cooling water is increased and the total amount of heat discharged to the sea is reduced.

According to a fifth aspect of the present invention, the temperature of the cooling water discharged to the sea is lowered by injecting seawater for diluting the cooling water from the primary water discharging channel into the secondary water discharging channel. Features.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a thermal power plant, a combined power plant, a nuclear power plant, and the like according to the present invention.

The steam generated in the steam generating equipment 1 expands in the steam turbine 2 to generate mechanical energy, and the generator 3 is rotated by this energy to generate electric power.

The steam from the steam turbine 2 is guided to a condenser 4, cooled by cooling water in the condenser 4, condensed, and condensed. The steam is supplied through a feed water heater 11 by a feed water pump 5. It is sent to the generating equipment 1 and turns into steam again.

A part of the steam supplied to the steam turbine 2 is extracted and supplied directly to the feed water heater 11 to heat the water sent by the feed pump 5.

As the cooling water supplied to the condenser 4, generally, seawater is used. The cooling water is pumped from a cooling water intake port 6 by a cooling water pump 7 and supplied to the condenser 4 through a cooling water intake pipe 8. You.

Then, the condenser 4 exchanges heat with steam,
After passing through the cooling water discharge passage 9, it is cooled by the cooling water discharge device 15, and is discharged again to the sea from the cooling water discharge port 10.

FIG. 2 is a diagram showing a schematic configuration of the cooling water drainage device 15. The primary water discharge channel 20 connected to the outlet water discharge side of the condenser 4 and the secondary water discharge channel provided at a position lower than the primary water discharge channel 20. It has a secondary water discharge channel 21 and the like.

Then, from the primary water discharge channel 20 to the secondary water discharge channel 2
By dropping the cooling water into the cooling water 1, the heat of the cooling water is directly exchanged with the atmosphere and discharged to the sea.

At the time of the drop, the cooling water is in direct thermal contact with the air, so that effective heat exchange can be performed.
Since the cooling water evaporates when it falls, the heat of vaporization is deprived and the temperature of the cooling water can be lowered.

When the cooling water is rectified when the cooling water is dropped from the primary water discharge channel to the secondary water discharge channel,
Since the contact area with air is reduced, it is difficult to perform sufficient cooling.

In such a case, as shown in FIG.
It is preferable to provide a scatterer 24 that scatters the cooling water in the cooling water falling path.

The scatterer may be a block made of concrete or the like, and the present invention is not limited to such a material.

As a result, the contact area with air increases,
Since the cooling efficiency can be improved, it is possible to reduce the total amount of heat discharged from the power plant or the like to the sea.

In the above description, the cooling water that has fallen into the secondary discharge channel 21 is drained as it is into seawater. However, as shown in FIG. The cooling water of the next water discharge channel 21 may be diluted and discharged to the sea.

Further, in the above configuration, the cooling water is dropped from the primary water discharge channel to the secondary water discharge channel, and the cooling water is directly heat-exchanged with the atmosphere. However, as shown in FIG. A cooling tower 23 may be provided between the secondary water discharge channel 20 and the secondary water discharge channel 21, and the cooling water may be passed from the primary water discharge channel 20 to the cooling tower 23 and returned to the secondary water discharge channel 21.

Thus, in addition to the cooling effect of the cooling water falling and coming into direct thermal contact with the atmosphere, the forced cooling of the cooling water by the cooling tower 23 is obtained, so that the heat of the cooling water is efficiently removed from the atmosphere. Can be released.

It is obvious that the cooling water may be cooled only by the cooling tower 23 and discharged to the sea as shown in FIG. 6, and the number of the cooling towers 23 at this time limits the present invention. Instead, it can be increased or decreased as needed.

[0036]

As described above, according to the first aspect of the present invention, the cooling water cooling system discharges the heat of the cooling water discharged from the plant to the atmosphere, cools the cooling water and discharges the cooling water to the seawater. The provision of the device makes it possible to reduce the total amount of heat discharged to the sea.

According to the second aspect of the present invention, the primary water discharge channel connected to the plant is connected to the cooling water cooling device, and the primary water discharge channel is provided at a position lower than the primary water discharge channel to receive the cooling water from the primary water discharge channel. Establish a secondary drainage channel to drain into the sea,
When the cooling water flows down from the primary water discharge channel to the secondary water discharge channel, the cooling water is directly exchanged with the atmosphere for cooling, so that the total amount of heat discharged to the sea can be reduced.

According to the third aspect of the present invention, the cooling water cooling device is provided at the primary water discharge passage connected to the plant and at a position lower than the primary water discharge passage to receive the cooling water from the primary water discharge passage. It is composed of a secondary water discharge channel for draining into the sea and a cooling tower that exchanges cooling water from the primary water discharge channel with the atmosphere. When the cooling water flows down from the primary water discharge channel to the secondary water discharge channel, Is cooled by exchanging heat with the atmosphere, so that the total amount of heat released to the sea can be reduced.

According to the fourth aspect of the present invention, there is provided a scatterer that scatters cooling water flowing between the primary water discharge channel and the secondary water discharge channel to increase the efficiency of heat exchange with the atmosphere. Since the cooling water is provided, the cooling efficiency of the cooling water is increased, and the total amount of heat discharged to the sea can be efficiently reduced.

According to the fifth aspect of the present invention, since the seawater for diluting the cooling water from the primary water discharge channel is injected into the secondary water discharge channel, the temperature of the cooling water discharged to the sea can be lowered. Will be possible.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a plant applied to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a cooling water drainage device according to the present invention.

FIG. 3 is a diagram showing a configuration of a flying device.

FIG. 4 is a configuration diagram in a case where cooling water in a secondary water discharge channel is diluted with seawater and discharged to the sea.

FIG. 5 is a configuration diagram when a cooling tower is also provided.

FIG. 6 is a configuration diagram when a plurality of cooling towers are arranged in parallel.

FIG. 7 is a schematic configuration diagram of a plant applied to a description of a conventional technique.

FIG. 8 is a schematic configuration diagram of a cooling water drainage device applied to the description of the conventional technique.

FIG. 9 is a schematic configuration diagram of a cooling water drainage device applied to the description of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steam generation equipment 2 Steam turbine 3 Generator 4 Condenser 5 Water supply pump 6 Cooling water intake port 7 Cooling water pump 8 Cooling water intake pipe 9 Cooling water discharge channel 10 Cooling water discharge port 11 Direct feed water heater 11 Feed water heater 15 Cooling water drainage device 20 Primary water discharge channel 21 Secondary water discharge channel 22 Dilution water pump 23 Cooling tower 24 Disperser

Claims (5)

[Claims] 1. A cooling water draining device for a plant, comprising a cooling water cooling device that discharges heat of cooling water discharged from a plant to the atmosphere, cools the cooling water, and discharges the cooling water to seawater. 2. A cooling water cooling device, comprising: a primary water discharge channel connected to a plant; and a secondary water discharge device provided at a position lower than the primary water discharge channel to receive cooling water from the primary water discharge channel and discharge it to the sea. A water discharge channel, wherein when the cooling water flows down from the primary water discharge channel to the secondary water discharge channel, the cooling water is directly exchanged with the atmosphere to cool the air. Plant cooling water drainage device. 3. A cooling water cooling device, comprising: a primary water discharge channel connected to a plant; and a secondary water discharge device provided at a position lower than the primary water discharge channel to receive cooling water from the primary water discharge channel and discharge it to the sea. A water discharge channel, having a cooling tower for exchanging heat of the cooling water from the primary water discharge channel with the atmosphere, and exchanging the cooling water with the atmosphere when the cooling water flows down from the primary water discharge channel to the secondary water discharge channel. The cooling water drainage device for a plant according to claim 1 or 2, wherein the cooling water is drained. 4. Between the primary water discharge channel and the secondary water discharge channel,
The cooling water draining device for a plant according to any one of claims 1 to 3, further comprising a scatterer that scatters the cooling water flowing down between them to enhance heat exchange efficiency with the atmosphere. 5. The cooling water discharge device for a plant according to claim 1, wherein seawater for diluting cooling water from the primary water discharge channel is injected into the secondary water discharge channel.