JPS6260640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a biological removal device used in a seawater path for heat exchange or cooling in a seawater-using plant.

Conventionally, in nuclear power plants, chemical plants, and thermal power plants, seawater is circulated to remove various types of heat generated within the plant, to cool the pure water used there, or to extract chemicals such as chlorine from seawater. Water is taken in from a water intake using a water pump or a seawater pump, and sent to a condenser, heat exchanger, or chemical substance extraction device via seawater piping.

A filter such as a screen, a mesh filter, or a ball cleaning device is provided along the seawater circulation path to prevent fish and other living things from entering the seawater.

However, with the above method, shells and organisms that are too large to be removed by the screen or mesh filter may flow in and adhere to the inside of the pipes or heat exchanger, causing metal deterioration or corrosion. This has the disadvantage that pressure loss increases and the capacity of the seawater pump must be increased.

The present invention was made in view of the above circumstances, and
The purpose is to kill creatures in the seawater with electric current,
By removing this, we can prevent metal deterioration and corrosion caused by living organisms adhering to the inside of pipes and heat exchangers, extending their lifespan, and also prevent overloading of seawater pumps and prevent condensers, heat exchangers, etc. The present invention aims to provide a biological removal device that improves efficiency and safety during inspection.

An object of the present invention is to provide a biological removal device installed in a seawater path in a seawater-using plant, the biological removal device comprising a tubular body, the tubular body having a first tubular portion internally provided with an insulating lining; A second tubular part is removably connected to the downstream side of the first tubular part via an insulating packing and houses a mesh basket therein, and the first tubular part is disposed at both ends of the interior thereof. This is achieved by a biological removal device characterized by having a holding plate made of a conductive material and a plurality of thin tubes made of a conductive material attached to the holding plate, each of which is connected to an external power source via a power supply terminal. .

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

Figure 1 shows the seawater cooling system diagram of the power plant.

In the figure, the seawater cooling system includes a water intake 1 with a screen 1a for taking in seawater, a circulating water pump 2 for transferring the taken seawater, a four-way valve 3 for adjusting the flow direction of the seawater, and a heat removal system. Consisting of a condenser 4 for cooling, a ball cleaning device 5 consisting of a ball recirculation pump 5a, a collector 5b, etc. for cleaning the inside of the condenser, and a discharge port 6 for discharging seawater. In the middle of this cooling system, there is a gate valve 7 that stops the flow of seawater.
A pre-screen 8 for ball injection and a strainer 9 for recovery are provided.

Immediately after the circulating water pump 2, the cooling system is separated into two directions, each with an electric gate valve 1.
Biological removal devices 12 and 13 are arranged in parallel via 0 and 11.

As shown in FIG. 2, the biological removal device 12 includes a first tubular section 14 provided with an insulating lining 13 on the inside, and a mesh 15 connected to the downstream side of the first tubular section 14.
a second tubular part 16 that accommodates a mesh basket 15 having a diameter of 15 mm, each having flanges 17 and 18 at both ends, and is connected to each other by bolts and nuts via an insulating packing 19. .

A plurality of thin copper tubes 21 are supported in the first tubular portion 14 by a holding plate 20 made of copper, and an external power source 24, 24 are connected.

In the seawater cooling system configured as described above, the cooling seawater taken in by the circulating water pump 2 from the water intake 1 is separated into two directions and flows to the biological removal devices 12 and 12 via the electric gate valves 10 and 11. .

Next, the seawater that has flowed into the biological removal device is guided to the copper capillary tube 21, where the current supplied from the external power source 24 through the power terminals 22 and 23 flows through the seawater, and the water intake screen 1
Living things in the seawater that have passed through a die, collect in the mesh basket 15, and are removed.

As shown in FIG. 1, the biological removal device 12 is equipped with differential pressure detectors 25, 25 to check the amount accumulated in the mesh basket 15. electric gate valve 10,
11 switching is performed.

Furthermore, ammeters 26, 26 and flowmeters 27, 27 are attached to the biological removal device 12 so that its status can be constantly observed.

As explained above, according to the present invention, organisms in the seawater that have passed through the water intake are killed by the electric current and removed by the mesh basket, and larvae and microorganisms of organisms that cannot be captured by the mesh basket are killed. Because it is released from the drain, it does not adhere to the inner walls of the cooling system's seawater pipes, condensers, heat exchangers, etc., which prevents metal deterioration and corrosion, and also prevents water from circulating water pumps, etc. It prevents overload and has a great effect on improving operating efficiency, extending the life of plant equipment, and improving safety.

[Brief explanation of the drawing]

FIG. 1 is a seawater cooling system diagram including the biological removal device of the present invention, FIG. 2 a is a partial sectional view of the biological removal device of the present invention, and FIG.
Figure c is a partially cutaway perspective view of the mesh basket. 1... Water intake, 2... Circulating water pump, 3... Four-way valve,
4... Condenser, 5... Ball cleaning device, 6... Discharge port,
7... Gate valve, 8... Prescreen, 9... Strainer, 10, 11... Electric gate valve, 12... Biological removal device, 14... First tubular part, 15... Mesh basket, 16... Second tubular part, 19...Insulating packing, 21...Copper thin tube, 24...External power supply.

Claims (1)

[Scope of Claims] 1. A biological removal device installed in a seawater path in a seawater-using plant, wherein the biological removal device comprises a tubular body, and the tubular body has a first tubular portion provided with an insulating lining inside. , a second tubular part removably connected to the downstream side of the first tubular part via an insulating packing and housing a mesh basket therein, the first tubular part having both inner ends thereof. What is claimed is: 1. A biological removal device characterized by having a holding plate made of a conductive material, each of which is arranged in a press plate and connected to an external power source via a power terminal, and a plurality of thin tubes attached to the holding plate. 2. The organism removal device according to claim 1, wherein the tubular bodies are arranged in parallel with the seawater path and each has an electric gate valve on the seawater inflow side. 3. The biological removal device according to claim 1, wherein the tubular body has a differential pressure detector for detecting clogging of the mesh basket. 4. The biological removal device according to claim 1, wherein the first tubular portion has a flow meter for measuring the flow rate in the capillary.