JP2005113450A - Apparatus for preventing inflow of foreign matter into intake - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for positively preventing inflow of foreign matter into an intake, especially when a large amount of jellyfish flows into an inflow channel. <P>SOLUTION: The apparatus has a recovering pontoon, a bottom net, and two float chains. The recovering pontoon floats on the sea level of the inflow channel for introducing cooling sea water from the sea, and functions as a foreign matter receiving port. The bottom net is triangularly spread from the recovering pontoon as a vertex toward the sea bottom on an entering side of the intake channel. The float chains extend on the sea level from the recovering pontoon along two sides of a triangle defining the bottom net, extending from the vertex. Further the apparatus has vertical nets expanding in a front layer area of the sea, which is firmly hung from the float chains to form openings between lower edges of the respective vertical nets and the bottom net. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention prevents floating foreign substances such as jellyfish from flowing into water intakes that reach water intakes of facilities that use a large amount of seawater as cooling water, such as nuclear power plants and thermal power plants. The present invention relates to an apparatus for preventing foreign matter from flowing into a water intake channel.

  At present, nuclear power plants and thermal power plants take a large amount of seawater for use as cooling water. In order to prevent floating foreign substances such as jellyfish from flowing into the seawater intake port, a travel screen, for example, is placed in front of the water intake port, and foreign matter on the seawater surface or in the seawater is captured on a rotating screen. , This is pulled up to the ground together with the screen and collected. The collected foreign matter is mainly jellyfish and is buried in the facility or treated as industrial waste.

  However, when a large amount of jellyfish is generated or when a large amount of jellyfish flows in due to the flow of tide, the screen is easily clogged and water intake is hindered. In addition, since a large amount of jellyfish must be treated as waste, the influence on the environment must be taken into account, and the processing cost is also problematic.

In order to solve such a problem, it is advantageous to reduce the amount of foreign matter collected at the intake port, and it is necessary to prevent the inflow of foreign matter in the intake passage leading to the intake port.
For example, the applicant previously installed a cone-shaped net that has an opening substantially matching the cross-sectional area of the intake channel and is gradually narrowed from the opening toward the downstream of the intake channel in Patent Publication 1, It was proposed to connect the pipe connected to the outlet on the downstream side of this conical net to a fish pump, and to guide the discharge pipe of this fish pump to the sea area outside the facility.
Japanese Patent Laid-Open No. 5-118019

  By the means proposed in Patent Document 1, the amount of foreign matter such as jellyfish that reaches the water intake can be greatly reduced. However, when a large amount of jellyfish has flowed into the intake channel, A large amount of jellyfish is captured in the conical net, and the mesh is blocked by the jellyfish. As a result, seawater does not circulate in the mesh and the inflow of seawater into the mesh stops, and as a result, it may be impossible to capture more jellyfishes with a cone-shaped net.

  Accordingly, an object of the present invention is to provide a device that can reliably prevent the inflow of foreign matter at a water intake even when a large amount of jellyfish flows into the water intake.

That is, the gist configuration of the present invention is as follows.
(1) A recovery trolley that floats on the surface of the intake channel that leads the seawater for cooling water from the ocean to the intake, and serves as a receiving port for foreign objects, and the recovery trolley at the top of the recovery floor A bottom net that expands in a triangular shape toward the bottom, and two float chains that extend from the recovery platform on the sea surface corresponding to two sides that extend from the apexes of the triangle that forms the bottom net. An apparatus for preventing foreign matter from flowing into a water intake, characterized in that a vertical net developed in the surface area of the sea is suspended and fixed, and an opening is provided between the lower end of the vertical net and the bottom net.

(2) The apparatus for preventing foreign matter from flowing into the water intake port according to (1) above, wherein a side net rising from the bottom net is provided on each of the two sides extending from the bottom net recovery boat.

(3) In (1) or (2) above, a transfer pump for foreign matter received from the recovery trolley is installed on the recovery trolley or on the quay, and the discharge pipe of this pump is outside the recovery tank or water intake path on the quay. A foreign matter inflow prevention device for water intakes, characterized by being led to the sea area.

(4) In the above (3), the foreign matter inflow prevention device to the water intake is characterized in that the transfer pump is a fish pump capable of transporting living organisms alive.

(5) In any one of the above (2) to (4), the foreign matter inflow prevention device to the water intake port is characterized in that a slip prevention rope is stretched between the side net and the vertical net.

(6) In any one of the above (1) to (5), an apparatus for preventing foreign matter from flowing into a water intake, wherein a bubbling pipe for ejecting bubbles is disposed below the bottom mesh.

  According to the apparatus of the present invention, when a foreign substance flowing into the intake port is guided by a net and introduced into the foreign substance receiving port, even if a large quantity of foreign substance flows into the range of the developed net, Since the collection of the foreign matter can be continued constantly without any trouble, the inflow of the foreign matter to the water intake is surely avoided.

Next, the apparatus of the present invention will be described in detail with reference to the drawings.
That is, FIG. 1 shows a case where the foreign matter inflow prevention device of the present invention is installed in a water intake channel 3 that protrudes forward from a quay wall 2 having a seawater intake 1. Here, the intake channel 3 is partitioned between the side walls 4 provided so as to protrude from the quay 2 toward the ocean, and is used for introducing seawater from between the standing piles 5 on the ocean side to flow into the intake 1. is there.

  The foreign matter inflow prevention device of the present invention is provided toward the seawater entering side of the intake channel 3, and first, as shown in FIG. It is placed on the sea near the intake 1 of No. 3. And the bottom net | network 7 which expand | deploys in the shape of a triangle toward the seabed by the side of the standing pile 5 of the intake channel 3 is provided by making this collection | recovery trolley | bogie 6 a vertex. The bottom net 7 is fixed to a rope stretched through a pulley between the sea surface and the sea bottom along the vertical pile 5, for example, and the installation depth is adjusted by operating this rope. Is possible.

  On the other hand, on the sea, two float chains 8a and 8b are erected from the recovery platform 6 in correspondence with the two sides 7a and 7b extending from the top of the triangle (the recovery platform 6) that forms the bottom net 7. In the illustrated example, each tip is fixed to the standing pile 5. Here, the float chains 8a and 8b are obtained by connecting a number of floats with ropes.

  Furthermore, the vertical chains 9a and 9b that extend to the surface layer of the sea, specifically, the range of 1 to 4 m below the sea surface are suspended and fixed to the float chains 8a and 8b, and the lower ends and bottoms of these vertical nets 9a and 9b are fixed. It is important to provide openings 10 a and 10 b between the net 7. Below, it demonstrates centering on the effect of this opening part.

  Now, as shown in FIG. 3 and FIG. 4, the seawater to be cooled is led from the standing pile 5 that hits the inlet of the intake channel 3 to the intake channel 3 and the intake port 1, riding on this seawater flow, and the jellyfish 12 The foreign matter enters the intake channel 3. Normally, turbulent flow is generated when seawater passes through the standing pile 5, and the jellyfish 12 floating near the seabed rises to the surface layer area below the sea level. That is, most of the jellyfish 12 that entered the intake channel 3 from the vertical pile 5 floats near the sea surface, so that they are converged on the recovery truck 6 by the vertical networks 9a and 9b developed in the surface layer of the sea. Guided.

On the other hand, the jellyfish 12 that floats in the sea without rising near the vertical pile 5 from the vicinity of the seabed is also returned to the recovery truck 6 by the bottom net 7 having an upward slope from the seabed or near the seabed toward the recovery truck 6. Guided.
Thus, the jellyfishes 12 gathered to the collection trolley 6 are collected as a receiving port.

  Here, when a large amount of jellyfish, which is a conventional problem, flows into the apparatus, a large amount of jellyfish is captured by the vertical meshes 9a and 9b and the bottom mesh 7, and the mesh is blocked by the jellyfish. This is the same as the conventional example described above. However, even if the net is blocked by jellyfish, the circulation of seawater is ensured through the openings 10a and 10b provided between the bottom net 7 and the vertical nets 9a and 9b, and the opening has a recovery limit. If an excessive amount of jellyfish enters, it will function as a bypass to escape excess jellyfish. That is, since the circulation of seawater in the capture area constituted by the vertical nets 9a and 9b and the bottom net 7 is always maintained, and jellyfish exceeding the processing limit is excluded, a large amount of jellyfish 12 in the capture area is gradually increased. As a result of collecting from this to the recovery trolley 6 and recovering from here, it eventually returns to a steady recovery state.

  Note that the openings 10a and 10b preferably have an area of 60% or more of each triangle having the two sides 7a and 7b and the float chains 8a and 8b as two sides. More preferably, it is 80% or more. This is because if the area of the opening is less than 60% of the triangle, it is difficult to ensure the flow of seawater that passes through the net even when a large amount of jellyfish flows into the net.

  Further, in order to more surely guide the jellyfish 12 by the bottom mesh 7, as shown in the figure, side networks 11a and 11b rising from the bottom mesh 7 on the two sides 7a and 7b of the bottom mesh 7, and further 11c are provided. It is preferable to provide it. Also in this case, it is important to secure the openings 10a and 10b between the tips of the side nets 11a and 11b and the lower ends of the vertical nets 9a and 9b. This side net is preferably about 1 to 2 m in height.

Moreover, as shown in FIG. 2, foreign substances such as jellyfish that have gathered in the recovery trolley 6 are sucked through a transfer pump 13 installed in the recovery trolley 6, and the discharge pipe 14 of this pump is placed on the quay 2. The jellyfish 12 is led to the collection tank 15 and stored in the collection tank 15, and is appropriately discarded from here. At that time, it is advantageous to separate the seawater by the separator 16 and discharge only the jellyfish to the recovery tank 15. Alternatively, the discharge pipe 14 can be extended to the sea area outside the water path, and the jellyfish can be returned to the sea. At that time, it is recommended to use a fish pump (for example, Kyoei Construction Machinery Co., Ltd. Kyoei-style jellyfish transfer pump) that can transport living organisms as the transfer pump 13 and a flexible hose as the discharge pipe 14. The
The transfer pump 13 may be installed on the quay 2 instead of on the recovery trolley 6.

  Further, as shown in FIG. 2, the gap between the side nets 11a and 11b and the vertical nets 9a and 9b is extended by an appropriate number so that the opposing position between the side nets and the vertical nets is increased. It is preferable to prevent the jellyfish from being displaced.

Here, as shown in FIG. 2, bubbling pipes 18 for blowing bubbles are arranged at the bottom of the bottom net 7, and in the process of injecting air from the bubbling pipes 18 to make the bubbles rise above the sea surface, It is also possible to raise the foreign matter so that the guidance to the collection trolley 6 along the bottom net 7 can be performed more reliably.
Similarly, by attaching elasticity to the upper end edges of the side nets 11a and 11b connected to the bottom net 7 at intervals of 50 cm, for example, so that the bottom net 7 is always tensioned, Movement along the bottom net 7 of the jellyfish can be performed more smoothly.

Further, the transfer pump 13 on the recovery trolley 6 (or on the quay) can be operated in accordance with the invasion of a jellyfish or the like without always operating. That is, as shown in FIG. 5, an inclinometer 19 is installed on the entrance side of the foreign substance suction port 6a of the recovery trolley 6, and the invasion of the jellyfish is detected by the inclinometer 19, and the transfer pump 13 is activated at that time. Can be made. Here, the inclinometer 19 has a plurality of sensor rods 19a arranged at predetermined intervals in the width direction of the recovery trolley 6, and the jellyfish 12 comes into contact with any one of these sensor rods 19a so that the sensor rod 19a is The operation circuit of the transfer pump 13 is connected when it is pushed down and falls down.
The inclinometer 19 can be installed in a path through which the jellyfish flows, for example, in the vertical pile 5 or in the vicinity thereof, in addition to the recovery trolley 6.

  Using the apparatus described in Patent Document 1 described above, when the jellyfish were mainly collected in the intake channel over a period of 6 months in which a large amount of jellyfish was generated, the situation where the recovery was impossible, that is, the net was clogged. As a result, there was a situation where the distribution of seawater was hindered, so it was necessary to cut the net to eliminate the internal jellyfish.

  On the other hand, when the apparatus of the present invention is installed in the same intake channel almost at the same time and mainly jellyfish are collected according to the situation shown in FIG. Met.

It is a figure which shows the intake channel which installed the foreign material inflow prevention apparatus of this invention. It is a perspective view which shows the foreign material inflow prevention apparatus of this invention. It is a top view which shows the foreign material inflow prevention apparatus of this invention. It is a side view which shows the foreign material inflow prevention apparatus of this invention. It is a figure which shows the means to detect inflow of a foreign material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intake port 2 Quay wall 3 Intake channel 4 Side wall 5 Standing pile 6 Recovery trolley 7 Bottom net 8a, 8b Float chain 9a, 9b Vertical net 10a, 10b Opening 11a, 11b Side net 12 Jellyfish 13 Transfer pump 14 Discharge pipe 15 Recovery Tank 16 Separator 17 Slip prevention rope 18 Bubbling pipe 19 Inclinometer

Claims (6)

  A recovery trolley that floats on the surface of the intake channel that leads the seawater for cooling water from the ocean to the intake, and a triangle toward the bottom of the intake channel with the recovery trolley at the top. Corresponding to two sides extending from the apex of the triangle forming the bottom net, and two float chains extending from the recovery platform on the sea surface. An apparatus for preventing foreign matter from flowing into a water intake, wherein a vertical mesh developed in a surface area is suspended and fixed, and an opening is provided between a lower end of the vertical mesh and a bottom mesh.   2. The apparatus for preventing foreign matter from flowing into a water intake according to claim 1, wherein a side net rising from the bottom net is provided on each of the two sides extending from the bottom stand recovery boat.   In Claim 1 or 2, the transfer pump for foreign matter received from the recovery trolley was installed on the recovery trolley or on the quay, and the discharge pipe of this pump was led to the recovery tank on the quay or to the sea area outside the intake route. A foreign matter inflow prevention device to a water intake characterized by   4. The foreign matter inflow prevention device according to claim 3, wherein the transfer pump is a fish pump capable of transporting living organisms alive.   5. The foreign matter inflow prevention device according to claim 2, wherein a slip prevention rope is stretched between the side net and the vertical net.   6. The apparatus for preventing foreign matter from flowing into a water intake according to any one of claims 1 to 5, wherein a bubbling pipe for ejecting bubbles is disposed below the bottom mesh.

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