JPH05118019A - Remover for jellyfish in intake path - Google Patents

Abstract

PURPOSE:To remove jellyfish to the sea area outside facilities without damaging the jelly fish by a method in which jellyfish is arrested by a conical net set in an intake path and sucked up by a fish pump. CONSTITUTION:A conical net 7 having an opening matching with the crosssectional area of an intake path 1, having a shape gradually throttled from the opening toward the downstream of the intake path, is set in water of the intake path 1 and a connecting tube 12 is connected to a mouth 11 connected to the outlet of the downstream side of the net 7. The connecting tube 12 is then connected to a fish pump 13 of a structure to protect jellyfish from damage. Jellyfish 6 arrested by the net 7 is sucked up by the pump 13 through the tube 12, and sent out to the sea area outside the facility through a discharge tube 14 without damaging it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility such as a nuclear power plant or a thermal power plant that uses a large amount of seawater as cooling water without damaging the jellyfish that has flowed into the intake channel. The present invention relates to a device for transferring to the sea area.

[0002]

2. Description of the Related Art At present, in nuclear power plants and thermal power plants, an intake channel is provided from the sea to the cooling device, and seawater is introduced by a powerful pump through this intake channel to generate turbine exhaust (rotating the turbine). High pressure steam after depressurization)
After cooling, the seawater is discharged into the sea. In order to introduce seawater with such a powerful pump, jellyfish and other suspended matter near the inlet (intake) of the cooling water intake channel flow into the intake together with seawater, and as a result, those suspended matter are discharged from the cooling device. If the cooling device is stopped due to the eyes and the power generation device is also stopped, the damage will be serious.

Therefore, conventionally, in order to prevent the inflow of suspended solids such as jellyfish, a net inclined forward from the sea surface to the bottom of the sea is installed in front of the intake so as to surround the intake. In addition, in order to prevent the jellyfish that have flowed in through the lower opening of the jellyfish prevention mesh on the front of the water intake from flowing into the cooling device, a dust remover (suspended material such as jellyfish clogging the iron grid screen etc. A device for scooping by power) was installed in the waterway.

[0004]

However, in the above-mentioned conventional dust removing device, when a large amount of jellyfish is generated such that the jellyfish abnormally occurs and the sea surface becomes a jellyfish color, the above-mentioned lower opening of the jellyfish prevention mesh is used. The inflow of jellyfish may be large, and the waterway may become full of jellyfish and the water surface may not be visible. In such a case, since the dust remover described above cannot raise a certain amount of jellyfish and scoop it up, the dust remover loses its role.
Due to the large amount of jellyfish that flowed into the cooling system, resulting in shutdown of the cooling system and power generation system, and the large amount of jellyfish that homes, factories, hospitals, transportation facilities, traffic signals, etc. rushed to the power plant. There was a risk of paralysis for hours or even days leading to a power outage panic. Most of the jellyfish scooped up by the dust remover were damaged, so they could not be discharged to the sea as they were, so they were landed. However, there was a problem that before it was buried, it emitted a foul odor and could cause odor pollution.

[0005]

In order to solve the above-mentioned problems, the present invention has an opening that substantially matches the cross-sectional area of the intake channel, and gradually narrows from the opening toward the downstream side of the intake channel. If necessary, install a conical net in the water of the intake channel, connect the pipe connected to the outlet on the downstream side of this conical net to a fish pump that does not damage the jellyfish, and discharge the fish pump. The pipe is guided to the sea area outside the facility to form a jellyfish elimination device in the intake channel.

[0006]

Since the device of the present invention is configured as described above, the jellyfish that has flowed into the water channel through the lower opening of the jellyfish prevention mesh provided on the front face of the intake port is meshed by the jelly-shaped jellyfish collecting net. It is guided to the outlet part downstream from the opening part, is sucked together with water by the operation of the fish pump, is discharged to the sea area outside the facility through the discharge pipe, and is carried away to the open sea along the natural tide.

That is, according to the device of the present invention, most of the jellyfish that has flowed into the water channel is collected by the catching net, and is sucked and removed by the operation of the fish pump. The fish pump used is a special volute pump that has a good track record for transferring live fish, so there is no risk of the jellyfish being damaged. Therefore, according to the device of the present invention, it is possible to prevent the stoppage of the cooling device of the power plant due to the inflow jellyfish and the damage caused by the stoppage of the power generator.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is an intake channel that guides seawater from the intake port provided on the quay to the cooling device, 2 is a side wall of the intake channel, 3 is a bottom plate of the intake channel, and 4 is an appropriate interval between the upper edges of the side walls 2. Beams crossed over by 5 are seawater flowing in the intake channel 1, 5a is the water surface, and 6 is a jellyfish floating in the seawater 5.

In this embodiment, a pyramid-shaped mesh 7 having an opening that substantially matches the cross-sectional area of the intake channel 1 and gradually narrowed from the opening toward the downstream side of the intake channel 1 is provided as necessary. It should be installed in the water of intake channel 1.

That is, FIG. 3 (a) is a front view of the net 7,
(b) is a side view thereof, and (c) is a plan view of (b). In the figure
7a is the opening of the net 7, 7b is the upper surface of the pyramid-shaped net, 7c is both side surfaces,
7d is the bottom surface. Further, 8 is a large number of floats attached to the upper edge of the opening 7a, 9 is a large number of sinks attached to the lower edge of the opening 7a,
A sheet 10 having a width of 30 to 50 cm is attached to both side edges of the opening 7a, and the water flow in the intake channel 1 acts on the sheet 10 to expand the net 7 on both sides.

Reference numeral 11 is a mouse connected to the outlet on the downstream side of the net 7, and this mouse 11 is connected via a suction pipe 12 to a fish pump 13 installed on land. The fish pump 13 is preferably a pump that does not damage the jellyfish as it passes through the pump, such as a special volute pump used for transferring live fish. Reference numeral 14 is a discharge pipe connected to the discharge port of the pump 13, and the discharge pipe 14 is extended to the sea area outside the facility so that the collected jellyfish is returned to the sea.

Reference numeral 15 is a rail bridge which is installed so as to straddle the intake channel 1, and 16 is its leg. Reference numeral 17 (see FIG. 1) is an electric traveling winch capable of moving along a rail 18 provided on the lower surface of the rail bridge 15, and 17a is connected to the mouse 11 by a rope of the winch. Further, 19 (see FIG. 2) is a winch for net landing, 19a is a rope, 20 is a hook connected to the end of the rope, and 21 is a guide roll for net landing.

22 and 23 (see FIG. 2) are net-extending winches installed on land, and 22a and 23a are ropes wound around the drums of the winches and connected to both sides of the opening of the net 7. Has been done. 24 and 25 are the guide rolls.

Since the device of the present invention is constructed as described above, when a large amount of jellyfish rush near the intake port and the jellyfish also enters the intake channel 1, the net 7 that has been fried on land is removed. Put in the intake channel 1 and spread.

That is, by operating the electric traveling winch 17,
The rear part of the net 7 is suspended together with the mouse 11 in the intake channel 1, and the winches 22 and 23 for expanding the net are operated to pull the opening of the net 7 and, as shown in FIG. 1 and FIG. 7
Deploy the water in the waterway 1.

As described above, when the net 7 is spread in the water channel 1 and the fish pump 13 is driven, the arrow A in the figure
The jellyfish 6 flows into the net 7 together with the water flow indicated by, and the jellyfish 6 gradually converges in the central part in the pyramid-shaped net 7 and is sucked into the tube 12 from the rear end of the net 7 via the mouse 11. , Is discharged from the discharge pipe 14 to the sea area outside the facility. In this case, since the fish pump 13 used in the device of the present invention does not damage the jellyfish 6, the jellyfish released into the sea again is carried away by the natural ocean current as it is.

When the jellyfish 6 disappears and the net 7 is no longer needed, the winches 22 and 23 are unwound and the ropes 22a and 23a are paid out.
By winding a, the net 7 can be unloaded. In this case, the electric traveling winch 17 suspended on the rail bridge 15 may be operated as necessary.

The above-mentioned various devices are electrically connected to a central control board to enable remote control, and can be operated by one person by installing a camera for monitoring the front of the water intake. Become.

That is, according to the above construction, when a jellyfish group comes in, the personnel of the central control unit turns on the control plate so that the spreading winches 22 and 23 start to wind and the rope 22a, When 23a is pulled, the net 7 stored on land is dropped into the intake channel 1 to start spreading.
At the same time, when the electric traveling winch 17 is operated to lower the rear end of the net 7 to the center of the water channel, the net 7 is stretched in the intake channel 1 as shown in FIGS. This stretched net 7
The jellyfish that has flowed in is sucked into the pipe 12 together with seawater, and is discharged through the discharge pipe 14.

[0020]

As described above, according to the device of the present invention, most of the jellyfish 6 that has flowed into the intake channel 1 is collected by the net 7 for collection, and the fish pump 13 operates to suck and remove the jellyfish 6. Will be done. The fish pump 13 used is a special volute pump, which has a proven track record for transferring live fish, so that the jellyfish is not damaged. Therefore, according to the device of the present invention, it is possible to obtain an excellent effect that the stoppage of the cooling device of the power plant due to the inflow jellyfish and the damage caused by the stoppage of the power generator can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional elevation view of an intake channel in which the device of the present invention is set.

FIG. 2 is a plan view of FIG.

3A is a front view of the net, FIG. 3B is a side view thereof, and FIG. 3C is a plan view of FIG.

[Explanation of symbols]

 1 Intake channel 2 Side wall 3 Bottom plate 4 Beam 5 Seawater 6 Jellyfish 7 Mesh 7a Opening 7b Upper surface 7c Side 7d Lower surface 8 Float 9 Sink 10 Seat 11 Mouse 12 Suction pipe 13 Fish pump 14 Discharge pipe 15 Rail bridge 16 Leg 17 Electric traveling winch 18 Rail 19 Winch for net landing 20 Hook 21 Guide roll 22, 23 Winch for net spreading 24, 25 Guide roll

Claims (1)

[Claims] 1. A cone-shaped net having an opening that substantially matches the cross-sectional area of the intake channel and gradually narrowing from the opening toward the downstream side of the intake channel is installed in the water of the intake channel as necessary. In this way, the pipe connected to the outlet on the downstream side of this conical net was connected to a fish pump that did not damage the jellyfish, and the discharge pipe of this fish pump was led to the sea area outside the facility. Jellyfish elimination device.