JP3129639B2 - Seawater circulation pump shaft lubrication water shell removal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing shellfish of lubricating water for a seawater circulation pump shaft used in a nuclear power plant or the like.

[0002]

2. Description of the Related Art In a nuclear power plant or the like, a large amount of seawater is used as cooling water in order to return steam from a turbine for power generation to water by a condenser. For this reason, the seawater is circulated to the condenser by the seawater circulation pump. A part of the discharge water is extracted from the seawater circulation pump and supplied to the shaft sealing portion of the seawater circulation pump as lubricating water. A shaft lubrication water line is provided.

[0003] However, if the larvae at the attachment stage of the shellfish floating in the seawater adhere to the inner surface of the pipes or the like in the shaft lubrication water line and propagate, the shaft lubrication of the seawater circulation pump will not be performed sufficiently. It has been found that the amount of seawater circulation may be reduced, leading to a decrease in the output of the power plant. In addition, there is no prior literature on the prevention of shellfish adhesion to the shaft lubrication water line of the seawater circulation pump.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the prior art and provides a seawater circulation pump shaft lubricating water shell removal device capable of reliably preventing troubles caused by shellfish adhesion. It was made to provide.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention extracts a part of water discharged from a seawater circulation pump and supplies it as lubricating water to a shaft sealing portion of the seawater circulation pump. during axial lubricating water line, Rutotomoni provided a filter for removing shells deposition stage larvae in sea water, said shaft lubricating
A pressure booster to maintain the flow velocity in the water line at 2m / s or more
The pump is provided with a pump . Also seawater
Withdraw part of the water discharged from the circulation pump,
In the shaft lubrication water line that supplies lubrication water to the shaft seal of the pump
A filter to remove larvae during the attachment of shellfish in seawater.
The filter and repels marine organisms
It is also characterized by being made of a material with
You. Preferably, the filter has a slit width of 500 μm or less . Also, it and is preferably a backwash drain water pipe filter providing heating means for heating the 40 ° C. or higher. Further, it is preferable that the shaft lubrication water line is made of a material having a repellent effect on marine life.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is a piping diagram showing the entire apparatus of the present invention, 1 is a seawater circulation pump for supplying seawater to a condenser of a steam turbine, 2 is its motor, and 3 is a shaft seal of the pump. Reference numeral 4 is a seawater suction port, and 5 is a discharge port. Reference numeral 6 denotes a shaft lubrication water line which extracts a part of the discharge water from the vicinity of the discharge port 5 of the seawater circulation pump and supplies it to the shaft sealing portion 3 of the seawater circulation pump 1 as lubrication water.

[0007] The shaft lubrication water line 6 is preferably provided with a pair of filters 7. This filter 7
Is used to remove the larvae in the attachment stage of shellfish floating in seawater. For example, as shown in FIG. 2, a filter having a structure in which a metal wire 8 is wound around a perforated pipe 9 may be used. it can. In the present invention, since the slit width between the metal wires 8 of the filter is set to 500 μm or less, barnacles having the size of the larvae at the attachment stage of about 1000 μm can be reliably filtered. However, the size of the attached larvae of the mussel, which causes occlusion together with barnacles, is 13
Since it is about 0 μm, more reliable filtration is possible if the slit width is about 100 μm.

The material of the filter 7 is preferably made of a metal material such as copper, nickel and silver which has a repellent effect on marine life. In particular, beryllium copper exhibits an excellent repellent effect on shellfish, and can surely prevent marine organisms from attaching to the filter 7.

Thus, according to the present invention, the discharge port 5
Of the seawater circulation pump 1 is supplied as lubricating water to the shaft seal portion 3 of the seawater circulation pump 1 after filtering the seawater extracted from the vicinity of the filter with the filter 7.
It is possible to prevent an accident in which a shellfish is adhered to and closed. However, even if the larvae of the shellfish do not enter the portion after the filter 7, the shellfish may adhere to the portion on the front side of the filter 7. Therefore, it is preferable to take the following various measures. .

FIG. 3 is a more specific piping system diagram around the filter 7. As shown in FIG.
Is provided in front of the pump, and the discharge water extracted from the vicinity of the discharge port 5 of the seawater circulation pump 1 is pressurized by the pressure pump 10 so that the water in the pipe 11 of the shaft lubricating water line 6 is reduced. Keep the flow velocity at 2m / s or more. If the flow velocity is maintained at 2 m / s or more in this way, the larvae in the attachment stage of the shellfish cannot adhere to the tube wall, and there is no possibility that the pipe 11 will be blocked.

The tank shown in the upper left part of FIG. It is preferable that fresh water is stored in the backwash tank 12, and the filter 7 is regularly backwashed with fresh water. Since two filters 7 are provided, they can be backwashed alternately. In this way, by backwashing the filter 7 regularly and replacing the shaft lubrication water line 6 with fresh water, it is possible to prevent the propagation of marine life.

Further, the backwash water is discharged from the filter 7 through the backwash drain water pipe 13 at the time of backwash, and shellfish are prevented from adhering to the backwash drain water pipe 13. For this reason, it is preferable that a heater be wound around the backwash drain water pipe 13 to maintain the temperature at 40 ° C. or higher. It has been confirmed that shellfish do not adhere to piping maintained at 40 ° C or higher.

As described above, according to the present invention, shellfish are prevented from adhering to the shaft lubricating water line 6, and the shaft lubricating water line 6
Power plant accident due to blockage of the power plant can be prevented. It is preferable to use a material having a repelling effect on shellfish such as copper, nickel, silver, and beryllium copper not only for the filter 7 but also for the shaft lubrication water line 6. In addition to using these materials, a method of applying a paint having a repellent effect to the inside of the pipe can also be adopted.

[0014]

As described above in detail, according to the present invention, the adhesion of shells to the seawater circulation pump shaft lubricating water line can be reliably prevented, and the output of the power plant due to the blockage of the shaft lubricating water line. There is an advantage that a fall accident can be prevented.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing the entire apparatus of the present invention.

FIG. 2 is an enlarged view of a filter portion.

FIG. 3 is a specific piping system diagram near a filter.

[Explanation of symbols]

1 Seawater circulation pump, 2 motor, 3 pump shaft seal, 4 seawater suction port, 5 discharge port, 6 shaft lubrication water line, 7 filter, 8 metal wire, 9 perforated pipe,
10 Boost pump, 11 piping, 12 backwash tank, 13 backwash drain water piping

Continuation of front page (72) Inventor Kota Fukuda 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulator Co., Ltd. (56) References JP-A-9-25887 (JP, A) (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 35/02 B01D 29/48 B01D 35/16 C02F 1/00

Claims (5)

(57) [Claims] 1. A method of removing a part of water discharged from a seawater circulation pump and removing larvae of shellfish attached to seawater in a shaft lubrication water line supplied as lubrication water to a shaft sealing portion of the seawater circulation pump. Rutotomoni provision of a filter, the shaft lubricating water line
A booster pump is installed to maintain the internal flow velocity at 2m / s or more.
Shellfish remover seawater circulation pump lubricating water, wherein the girder. 2. A part of discharge water of a seawater circulation pump is drained.
And supply it as lubricating water to the shaft seal of the seawater circulation pump.
Removal of larvae during the attachment of shellfish in seawater in the shaft lubrication water line
And a filter for marine
It is made of a material that has a repellent effect on objects.
The seawater circulation pump shaft lubricating water shell removal device. 3. The slit width of the filter is 500 μm or less.
3. The shell removal device for seawater circulation pump shaft lubricating water according to claim 1 or 2 . 4. A seawater circulation pump lubricating water shellfish removing device according to claim 1 or 2 backwash drain water pipe provided with heating means for heating the 40 ° C. or more filters. 5. The axial circulating water line shellfish removing device seawater circulation pump lubricating water according to claim 1 or 2 constructed in accordance with a repelling effect material against sea organisms.