JP2002363958A - Intake screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake screen device capable of preventing intrusion of marine organisms and eliminating their being caught by a net in taking sea waters for using it as cooling water. SOLUTION: This intake screen device is provided with two partitioning walls 6 extending from the both sides of an intake 10 toward the sea, a netted screen 8 installed near their tips in such a state as closing the opening part between the partitioning walls 6, a head sprocket wheel 5 tensioning the screen 8 in a belt shape and rotatably moving it, a motor 4 rotating the head sprocket wheel 5, guides 2 provided at prescribed intervals in contact with the screen 8 for guiding and extending in the vertical direction, and a scraper board provided between the tip of the partitioning walls and a belt-shaped fold part adjacency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water intake screen device for preventing foreign objects such as jellyfish and seafood from entering a water intake when seawater is taken as cooling water in a plant such as a nuclear power plant or a thermal power plant. About.

[0002]

2. Description of the Related Art In a power plant of a thermal power plant or a nuclear power plant, seawater is taken and used as cooling water.
Cooling water is taken from the water intake and taken into the cooling water circulation system. When marine organisms such as jellyfish flow into the cooling water circulation system, the pipes are clogged and the amount of cooling water is reduced, so that the power generation capacity has to be reduced.

[0003] In order to prevent jellyfish from particularly flowing into the seawater to be taken, a net is provided so as to surround the water intake. The net is extended over a wide area to prevent clogging even if a large amount of jellyfish occurs. It is also known to extend the network automatically. This is described, for example, in JP-A-8-209667.

[0004]

In the prior art, a net is extended over a wide area so as to surround an intake port. For this reason, there is a problem that equipment for preventing the inflow of foreign substances such as jellyfish becomes large, and handling becomes troublesome. Also,
Since the jellyfish die, there is also a disadvantage that the disposal cost increases the operating cost.

An object of the present invention is to provide a water intake screen device which can prevent invasion of marine organisms and does not catch on a net.

[0006]

According to the present invention, there are provided two partition walls extending from both sides of an intake port toward the sea, and a net-like screen installed near a front end so as to close an opening of the partition wall. A head sprocket wheel that stretches and rotates the screen in a belt shape, a motor that rotates the head sprocket wheel, a guide that is provided at a predetermined interval and extends vertically to contact and guide the screen, and a tip of a partition wall. And a scraping plate provided between the belt-shaped folded portion and the vicinity thereof.

According to the present invention, a screen stretched perpendicular to the sea surface is continuously rotated in a belt-like manner in the horizontal direction, and marine organisms, particularly jellyfish, are transported to the vicinity of the scraping plate. The jellyfish and the like are peeled off with a scraper and released into seawater by the tide. Therefore, invasion of marine organisms into the intake can be prevented.

[0008]

FIG. 1 is a plan view showing an intake screen device according to the present invention, and FIG. 2 is a front view thereof.

In FIGS. 1 and 2, two concrete partition walls 6 are installed toward the sea, which is upstream of the water intake port 10, and a mesh-like partition wall 6 is provided near the front end of the partition wall 6 so as to close the opening. The screen 8 is arranged. The screen 8 is stretched in a belt shape and rotated by the head sprocket wheel 5 via the first shaft 3a. Reference numeral 3b serves to turn the screen 8 around the second axis to form a belt.

Reference numeral 4 denotes an electric motor, which is a drive source for rotating the head sprocket wheel 5. The axes 3a and 3b are
It is rotatably supported by bearings 11 installed vertically.

Reference numeral 1 denotes a jellyfish representing a marine creature. During the breeding season, the jellyfish rushes toward the coast as a large army and floats. Numeral 2 is a guide which becomes a support and is installed extending at a predetermined interval in the vertical direction to prevent the screen 8 stretched in a belt shape from being largely bent by waves or tides. This guide 2 is composed of bars 2a, 2b extending horizontally
And the lower rod 2a is buried in the sand on the sea floor.

Numeral 7 denotes a scraping plate which, when the jellyfish 1 is transported by the screen 8, discharges the jellyfish 1 to the seawater side so as not to enter the water intake port 10 side.

In this configuration, the partition wall 6 is buried deep in the seabed sand so as to withstand waves and water pressure. The lower side of the screen 8 is slightly higher than the seabed. If the lower side contacts the seabed, the net 8 cannot rotate and move, which may cause an accident. Since the jellyfish 1 floats near the sea surface, it does not enter through the lower gap.
In addition, the upper side is provided with a margin higher than the sea level 15b at the time of high tide so as to cope with the rising and falling of the tide.

The size of the screen 8 is, for example, 50 m in width and 20 m in depth.
Is about 7 cm square. The mesh is set to an appropriate size according to the marine organism to be suspended.

The jellyfish 1 approaching on the seawater flow 15a floats near the screen 8, and when it hits the jellyfish 1, the screen 8 rotates in the direction of the arrow 16 so that the second jellyfish near the turn is turned. It is sent to the shaft 3b side. Next, the jellyfish 1 is peeled off from the screen 8 by the scraping plate 7 installed in the vicinity, and discharged to the seawater side by the tide.
Therefore, the jellyfish 1 does not become an industrial waste and can also contribute to environmental protection, and seawater is taken into the intake port 10 without any foreign matter.

The motor 4 does not always need to be driven at all times, but may be driven at any time and at any time depending on the state of occurrence of marine organisms by observing the state of seawater from the partition wall 6. The moving speed of the screen 8 may be set according to the situation. The electric motor 4 is not limited, and may be a gasoline engine or the like as long as it serves as a power source.

[0017]

According to the present invention, the marine organisms represented by jellyfish are separated by the rotational movement of the screen and the scraping plate, and are discharged alive in seawater so as not to become industrial waste. This has the effect of taking seawater into the water outlet.

[Brief description of the drawings]

FIG. 1 is a plan view showing a water intake screen device of the present invention.

FIG. 2 is a front view showing a water intake screen device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Jellyfish 2 ... Guide 3a ... 1st axis 3b ... 2nd axis 4 ... Electric motor 5 ... Head sprocket wheel 6 ... Partition wall 7 ... Scrapping plate 8 ... Screen 10 ... Water intake

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Ima 3-2-2, Sachimachi, Hitachi, Ibaraki Prefecture Within Hitachi Engineering Services Co., Ltd. (72) Inventor Tetsuya Otake 3-2-2, Sachimachi, Hitachi, Ibaraki No. 2 Inside Hitachi Engineering Services Co., Ltd.

Claims (1)

[Claims] 1. Two partition walls extending from both sides of an intake port toward the sea, a net-like screen installed near the front end so as to close an opening of the two partition walls, and a belt connecting the screen. A head sprocket wheel that stretches and rotates the head, a motor that rotates the head sprocket wheel, a vertically extending guide that is provided at a predetermined interval and contacts and guides the screen,
An intake screen device, comprising: a scraping plate provided between a tip of the partition wall and a vicinity of the belt-shaped folded portion.