JP2000186317A - Apparatus for preventing flow of suspended matters into intake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically lay or erect a net erecting/laying block without providing monitoring of a state of a net that catches suspended matters on or in the sea, and without using motive energy. SOLUTION: A net 9 is provided which is extended between a sea floor 3 and a curtain wall 2 contributing to partitioning of a primary intake 4, to thereby enclose the primary intake 4 opening under the sea level. The net 9 reaches the sea floor, and is linked to the same. A portion of the net 9 near the sea floor 3, functions as an erecting/laying block 10 which is laid down based on the difference in pressure between the interior and exterior of the intake 4 under clogging of the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a floating substance at an intake for preventing jellyfish and other floating substances from the sea and underwater from entering an intake for a cooling system of a thermal power plant and a nuclear power plant. The present invention relates to an inflow prevention device.

[0002]

2. Description of the Related Art As this kind of prior art, for example,
There is one proposed by the applicant as Japanese Utility Model Publication No. 3-79327. This means that, on the sea in front of the cooling water intake port provided on the quay, a net that slopes forward and downward from the sea to near the seabed is installed around the intake port, and a lower part is placed between the lower edge of this net and the seabed. An opening is provided, and this lower opening can be opened and closed according to the distribution of jellyfish in the vertical direction. In this device, in the daytime, etc., jellyfish located in the surface layer of the underwater shall be prevented from flowing into the intake by a net that is stretched downward from the sea to near the seabed so as to surround the intake. Seawater for cooling can be sufficiently taken in from the lower opening provided between the lower edge of the net and the seabed. In this case, the opening / closing net in the lifting position is displaced downward manually or electrically to close the lower opening, thereby preventing the jellyfish from flowing into the intake port.

[0003]

However, according to this prior art, a special power for raising and lowering the opening / closing network is required.
There was a problem that constant monitoring of suspended matter was necessary.

[0004] It is an object of the present invention to solve such problems of the prior art, and it is an object of the present invention to eliminate the need to monitor the state of attachment of suspended matters to a net. Prior to any interruption of power generation or other serious problems caused by the clogging of the net by suspended matter, the whole or a part of the net, which is normally in an extended state, must be specially powered. Open automatically without the need and under sufficient seawater flow,
It is an object of the present invention to provide a device for preventing the inflow of suspended matter into an intake port, which can be automatically returned to an original extended position without power.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided a device for preventing inflow of suspended matter into an intake, between a seabed and a fixed side member which contributes to a section of a primary intake of seawater, more precisely. And a net surrounding the primary intake opening below the sea surface and extending to the sea floor. In this case, the standing portion falls down on the basis of the pressure difference between the inside and outside of the primary water intake under clogging.

[0006] In this device, under the normal stretched state of the net, the net removes jellyfish and other suspended matter from the fixed member to the seabed, regardless of the distribution of suspended matter below the sea surface. Regardless, it can be effectively collected under the selected mesh size, while seawater can flow at the required speed through the mesh of the net, based on the suction suction of cooling devices and the like. .

[0007] Under such an extended state of the net, the amount of collected suspended solids, the location of collection and the like actually change depending on the time of day, tide level, and the like. In the absence of special circumstances, most of the suspended matter trapped in the net is washed away by the tide, the swell of waves, and the like, so that the mesh of the net is not clogged.

On the other hand, a large amount of suspended matter is simultaneously collected in the net, which makes it difficult for seawater to flow smoothly through the net of the net, and causes a gap between the primary intake side and the opposite side of the net. When the pressure difference increases so as to overcome the buoyancy of the float that normally keeps the entire net or the portion near the seabed in an upright position, the entire net or the portion near the seabed has high pressure. The seawater automatically falls from the side to the low pressure side, and as a result, the lying part is opened to the primary intake.
Through its open part, it can flow smoothly into the primary intake with sufficiently low flow resistance. Therefore, by selecting the buoyancy of the float in relation to the required pressure difference, it is possible to sufficiently prevent the malfunction of the cooling device and the like.

When the whole or a part of the net is displaced in such a manner, the suspended matter collected by the net also flows into the primary intake together with seawater. There is a dust removal device installed between the primary intake and the secondary intake, mainly to remove suspended matter of small size enough to pass through the mesh of the net. Objects will also be sufficiently removed by this dust removal device.

If the above-mentioned pressure difference becomes smaller than the buoyancy of the float as a result of such a smooth flow of seawater, all of the nets in the lying state are under the action of the float itself. Alternatively, a part is automatically raised again, so that the part can collect the suspended matter again.

Thus, according to this device, when the net is clogged by the suspended matter, the standing falling part is automatically formed without monitoring the state of collecting the suspended matter and using any special power. The erected part can be automatically erected after the clogging is eliminated.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic vertical sectional view showing an embodiment in which a part of a net is a standing hill, in which 1 is a quay, 2 is a protruding structure from a quay 1 and a specific water area. Are respectively shown, and the curtain wall 2 defines a primary water intake 4 between a lower end portion thereof and the seabed 3.

In the quay 1, a secondary intake 5 for a water channel leading to a cooling device or the like is provided at a specific location in the water area surrounded by the curtain wall 2. In many cases, such a secondary intake is provided. A dust removal device 6, which can be a travel screen or the like, is provided between 5 and the primary water intake 4.

Here, the upper end of the curtain wall 2 and the anchor block 7 disposed on the seabed 3 extend in a direction in which the depth gradually increases as the distance from the curtain wall 2 increases. While being connected by a plurality of ropes 8 forming an angle of 30 to 80 °,
On these ropes, a net 9 is arranged around the curtain wall 2, surrounding it in the plane area leading to the wall 1a of the quay 1 and reaching the seabed 3, by means of which the net 9 opens below the sea surface. Surrounding the primary water intake 4 to be performed.

Here, a portion of the net 9 near the seabed, for example, a portion having a vertical height from the seabed of 1 to 1.8 m, is defined as a standing and falling part 10 and a lower end of the anchor block 7. The connected standing upright portion 10 has a float 11 having an appropriate buoyancy connected to the upper end of the inside of the slope of the rope 8 and is always kept in an upright state in which the float 11 is at an upper limit position. Note that, here, the standing position of the standing fall portion 10 can be specified by bringing the float 11 into contact with the rope 8. However, the rising position of the float 11 due to tide, wave undulation, or the like can be specified.
In order to remove the danger of entanglement with the rope 8 and to make the standing posture of the standing / falling portion 10 always sufficiently stable, an anchor rope 12 extending in the opposite direction to the rope 8 as shown in the drawing is used. It is preferable to specify the upper limit position of the float 11, and the rising and falling portion 10 can be made to stand along the rope 8 under the selection of the length of the anchor rope 12.

By the way, instead of directly connecting the upper and lower ends of the standing and falling portion 10 to the float 11 and the anchor block 7, respectively, the standing and falling portion 10 can be extended on a rope connected to each of them. It is.

In the apparatus configured as described above, when the seawater outside the net 9 is sucked through the primary and secondary water intake ports 4 and 5 based on the water suction force of the cooling device or the like, the seawater in the seawater is sucked. Jellyfish and other suspended matter will be collected by the net 9, and floating matter having a small size that cannot be collected by the net 9 will be sufficiently removed by the dust removing device 6.

Here, due to the collection of such suspended matter by the net 9, a large amount of suspended matter accumulates on the net before the collected suspended matter is washed away by a tidal current or the like. When the clogging state occurs, the suction pressure of the cooling device or the like causes a negative pressure on the intake ports 4 and 5 side from the net 9 and a positive pressure on the opposite side under the influence of the water head pressure and the like.

In this case, the force acting on the standing / falling portion 10 based on the pressure difference between the inside and outside of the net 9, and more precisely, in addition to this, the force acting on the standing / falling portion 10 When the weight of the suspended matter exceeds the buoyancy of the float 11, the float 11 sinks, and accordingly, the rising and falling portion 10 moves around its lower end connecting portion as shown by the temporary disposition line in FIG. I do. And the standing and falling part 1
When 0 is displaced in this way, seawater smoothly flows into the inside of the net 9 via the displaced portion, and flows into a cooling device or the like.
While a sufficient amount of seawater is supplied, the above pressure difference gradually decreases.

When seawater flows into the net 9 at a high speed at a high speed through the sloping portion 10 by the sloping portion 10, the sloping portion 1
Although the suspended matter collected at 0 is included, the suspended matter can be sufficiently removed by the dust removing device 6.

When the force acting on the rising and falling portion 10 based on the pressure difference between the inside and the outside of the net 9 becomes smaller than the buoyancy of the float 11, the float 11 re-emers and the rising and falling portion 10 is drawn. , And the suspended material can be collected again by the standing and falling portion 10.

Thus, in this apparatus, when the net 9 is clogged to a predetermined amount or more, the clogging state is monitored based on the pressure difference between the inside and the outside of the net 9 or the like. The portion 10 can be automatically displaced in a falling position, and can be automatically displaced in an upright position based on the elimination of the pressure difference.

FIG. 2 is a schematic vertical sectional view showing another embodiment of the present invention. This is because the curtain wall 2 is provided with a hood plate 21 projecting from the upper edge of the primary intake port 4 to the side opposite to the secondary intake port 5, and below the hood plate 21, A net 22 that stands up and down in the same manner as above is provided.
Is installed between the curtain wall 2 and the sea floor 3 via the hood plate 21 and surrounds the primary water intake 4 at the lower end portion of the curtain wall 2.

Here, the upper and lower ends of the net 22 are connected directly to the float 23 and the anchor block 7 directly or intermittently via a rope, and the float 23 is connected to the anchor block 24. Under the action of the connected rope 25, it is positioned below and very close to the hood plate 21. According to this configuration, the entire net 22 can be laid down and erected in the same manner as the above-mentioned upright erected portion 10, and the required amount of liquid can be sufficiently smoothed under the same operation and effect as the previous case. Water can be taken.

FIG. 3 shows the hood plate 2 shown in FIG.
1 shows an embodiment in which the primary intake 4 is directly surrounded by a net 22 and the whole of the net 22 is allowed to lie down and stand up, as shown in FIG. Things.

FIG. 4 is a schematic vertical sectional view showing still another embodiment, which is a frame plate having a secondary intake 5 opened to the seabed 3 and disposed above the intake 5. 31
And the first water intake 4 is opened between the water intake 5 and the flange of the water intake 5. Here, the net 32 is
When connected to the periphery of the seabed 3 and the seabed 3 and extended in a substantially frusto-conical shape, a portion near the seabed of the net 32 is formed as a rising and falling part 33 substantially similar to that shown in FIG. Of the float 34 is regulated by the anchor rope 35. Even with this configuration,
Under the action of the upstanding undulations 33, the same effects as those shown in FIGS. 1 and 2 can be obtained.

[0027]

As is apparent from the above description, according to the present invention, the standing undulations connected to the seabed are
Mainly, it is displaced on the basis of the pressure difference between the inside and outside with respect to the water intake, and when the pressure difference falls below a predetermined value, it is displaced upright to monitor the state of collection of suspended matter in the net, It is possible to automatically displace the standing and falling part as expected even if the operating power of the standing and falling part is unnecessary.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view showing another embodiment of the present invention.

FIG. 3 is a schematic vertical sectional view showing another embodiment.

FIG. 4 is a schematic vertical sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wharf 1a Wall surface 2 Curtain wall 3 Sea bottom 4 Primary water intake 5 Secondary water intake 6 Dust removal device 7,24 Anchor block 8,25 Rope 9,22,32 Net 10,33 Standing upstanding part 11,23,34 Float 12 , 35 Anchor rope 21 Hood plate 31 Frame plate

Claims (1)

[Claims] 1. A water intake, which is provided between a sea bottom and a fixed-side member contributing to a section of the water intake, surrounds the water intake opening below the sea surface, and is provided with a net reaching the sea bottom. An apparatus for preventing suspended matter from flowing into a mouth, wherein the entire net or a portion near the seabed connected to the seabed is erected on the basis of a pressure difference between an inside and an outside of an intake port under clogging thereof. A device for preventing inflow of suspended matter into an intake, characterized in that it is a part.