JPS5913603B2 - Method and device for preventing seawater organisms from adhering to water intake facilities - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for preventing the adhesion of seawater organisms to water intake facilities such as water intake pipes.

For example, in order to take seawater from the ocean for power generation or cooling, intake pipes are installed with intake ports opened on the seabed near the coast.The inner walls of intake pipes are filled with various seawater creatures such as mussels, Fujitbo, and oysters. may adhere to the pipes, reducing the functionality of the water intake pipes.

Conventionally, methods for preventing the above-mentioned seawater organisms from adhering to the inner walls of intake pipes include injecting toxic chemicals such as chlorine into the intake pipes, coating the inner walls of the intake pipes with antifouling paint, or using electrical means. However, methods that use toxic chemicals such as chlorine may cause environmental damage and adverse effects on nearby seawater organisms or the human body, and methods that use antifouling paints have a short shelf life. Moreover, in the case of water intake pipes, repainting the antifouling paint is extremely time-consuming and labor-intensive.

Furthermore, although the electrical method does not have the above-mentioned problems, it does have the problem of lacking reliability.

This invention was made to solve the above-mentioned problems, and in order to prevent seawater organisms from adhering to the water intake facility, heated wastewater from a power plant is periodically injected into the water intake pipe. , is characterized by heating the water intake pipe for a certain period of time to a temperature that kills seawater organisms.

The present invention will be explained from Example 1 with reference to the drawings.

FIG. 1 is a sectional view of a device for preventing the adhesion of seawater organisms to a water intake facility according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

In the figure, reference numeral 1 denotes a floating body installed above the water intake tower 3 of the water intake pipe 2, and this floating body 1 is provided with an air supply valve 4 and a water drainage valve 5. By supplying air from the floating body 1, buoyancy can be applied to the floating body 1.

At this time, the seawater in the floating body 1 is drained from the valve 5.

On the other hand, when injecting seawater into the floating body 1, the valves 4 and 5 are opened.

A screen device 7 is installed horizontally at the water intake 6 portion of the water intake tower 3, and the floating body 1 is fixed at a fixed position on the upper surface 9 of the water intake tower 3 by a guide 8 provided above the screen device 7. It is now possible.

Incidentally, the upper surface 9 is provided with an insertion hole 10 for a hanging member to be described later.

(Four pieces in this example) 11 is a cylindrical pipe that is slidably provided in close contact with the inner wall of the water intake tower 3.

This cylindrical pipe 11 is suspended below the floating body 1 via a hanging member 12 such as a wire, and when the seawater is removed from the floating body 1 and floated, the water intake tower 3
It is now possible to rise inside the water intake port 6 and close the water intake port 6.

(Indicated by the solid line in Figure 1.) 13 is the water intake 6 I! This hot water pipe is connected to the 2nd end of the IJ water intake pipe, and is used to inject heated waste water of 40 to 45°C from a power plant (not shown) into the water intake pipe 2.

An example of a method for preventing the adhesion of seawater organisms to a water intake facility using the apparatus for preventing the adhesion of seawater organisms having the above-mentioned configuration will be described below.

FIG. 3 is an explanatory diagram showing the flow of hot water and cooling water when the method of the present invention is applied to two water intake pipes 2 and 2'.

As shown in the figure, a hot water pipe from a hot water discharge pipe (none of which is shown) of a power plant is connected to a hot water pipe 1 through a valve 14, a hot water pump 15, and valves 16 and 16' to a water intake pipe 2°2'.
3, 13'.

A water landing tank 17 is provided at the base end (land side) of the water intake pipes 2, 2'.
, 17' are provided, and two cooling water pipes 18, 18' are installed in the water landing tanks 17, 17', respectively.
9, 19' and valves 20, 20', water is taken in through the water intake pipes 2, 2', and the water landing tank 17
, 17', the seawater collected within the vessel is sent to its destination.

The cooling water pipe 18° 18' has a discharge drain pipe 21.
．． 21' are connected via valves 22 and 22'.

Therefore, when injecting hot water into the intake pipes 2 and 2',
First, close the valves 20' and 16, and close the valves 22' and 1.
4 and 16' are opened, and hot water pump 15 causes heated waste water from the power plant at a temperature of 40 to 45°C to flow into hot water pipe 13'.

In addition, by draining seawater from the floating body 1' on the intake pipe 2' side, the cylindrical pipe 11 is raised, and the water intake port 6 on the intake pipe 2' side is blocked, preventing hot water from flowing out of the intake pipe 2'. prevent.

The hot water injected into the water intake pipe 2' in this way passes through the water intake pipe 2', collects in the water landing tank 17', and discharges into the water drain pipe 21'.
It is discharged from.

When the temperature of the water intake pipe 2' reaches a predetermined temperature after a certain period of time has elapsed, the operation of the hot water pump 15 and the cooling water pump 19' is stopped to lower the temperature of the water intake pipe 2'.

Then, when the temperature of the water intake pipe 2' falls to a certain temperature, the operation of the pump 15.19 is started again and hot water is injected to raise the temperature of the water intake pipe 2'.
Pour and drain hot water according to the temperature.

With the above operations, the number of seawater organisms in the intake pipe 2' is 40 to 4.
They die due to the high temperature of 5 degrees Celsius.

After that, the valve 14 is closed, the operation of the hot water pump 15 is stopped, and seawater is injected into the floating body 1' and the cylindrical pipe 11
Lower the water intake port 6 to open the cooling water pump 1.
9' to draw seawater into the water intake pipe 2', and
After confirming that the water temperature in 7' has reached a predetermined temperature, valve 22' is closed and valve 20' is opened to perform normal operation.

Next, when hot water is injected into the other water intake pipe 2, contrary to the above case, first close the valves 20 and 16', open the valves 22, 14 and 16, and then open the hot water pump 15'.
This causes hot water to flow into the hot water pipe 13.

In addition, seawater is drained from the floating body 1 on the intake pipe 2 side, and the cylindrical pipe 1
1, the water intake port 6 on the water intake pipe 2 side is closed.

The hot water injected into the water intake pipe 2 in this way passes through the water intake pipe 2, accumulates in the water landing tank 17, and is discharged from the discharge drain pipe 21.

Then, the hot water pump 15 and the cooling water pump 19 are operated intermittently so that the temperature of the water intake pipe 2 becomes constant.

As a result, seawater organisms within the water intake pipe 2' die due to the high temperature.

It was confirmed that at a temperature of 40 to 45°C, all the various seawater organisms that adhered to the inner wall of the water intake pipe died within a few minutes.

Thereafter, the valve 14 is closed, the operation of the hot water pump 15 is stopped, and seawater is injected into the floating body 1, the cylindrical pipe 11 is lowered, and the water intake port 6 is opened.

Then, the cooling water pump 19 is operated and the seawater intake pipe 2
After confirming that the water temperature in the water landing tank 17 has reached a predetermined temperature, the valve 22 is closed and the valve 20 is opened to perform normal operation.

The above explanation is for a case where there are two intake pipes, but even if there are more than two intake pipes, by alternately injecting hot water, it is possible to prevent seawater organisms from adhering to the intake pipes without affecting the water intake. .

As explained above, according to the present invention, by effectively utilizing heated wastewater discharged from a power plant, it is economical, does not adversely affect surrounding adults, is safe and reliable, and does not affect water intake. This brings about the useful effect of being able to perform treatment to prevent seawater organisms from adhering to the inside of the water intake pipe.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a device for preventing the adhesion of seawater organisms according to an embodiment of the present invention, Fig. 2 is a plan view of the same, and Fig. 3 is an operation for preventing the adhesion of seawater organisms into a water intake pipe using the same device. It is a figure showing the flow of hot water and cooling water in case. In the drawing, 1... floating body, 2... water intake pipe, 3... water intake tower, 4... air supply valve, 5......・Drainage valve, 6...
...Water intake, 7...Screen device, 8...
... Guide, 9 ... Top surface of 3, 10 ...
...Insertion hole, 11...Cylindrical tube, 12...
・Hanging member, 13, 13'...Hot water pipe, 1
4...Valve, 15...Hot water pump, 16.16'...Pal 7.17. 17'...Water tank, 18, 18'...
・Cooling water pipe, 19°19'...Cooling water pump, 20,20'...Valve, 2L21'...
...Discharge drain pipe, 22.22'...Valve.

Claims (1)

[Scope of Claims] 1. Preventing the adhesion of seawater organisms to a water intake facility, which is characterized by blocking the intake port of a water intake pipe and injecting hot water of 40°C or higher from the intake pipe end on the intake side of the water intake pipe. Method. 2. A floating body provided at the upper part of the water intake tower of the water intake pipe, into which seawater can be injected and which can remove seawater from the inside, and a floating body that is connected to the water intake tower via a hanging member from the floating body. 1. A device for preventing the adhesion of seawater organisms to a water intake facility, comprising: a cylindrical pipe for blocking a water intake suspended therein; and a hot water pipe connected to the end of the intake pipe on the water intake side.