JP3961702B2 - Floating substance inflow prevention device to water intake - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a floating inflow prevention device for a water intake that prevents, for example, jellyfish and other floating materials in the sea and in the sea from entering a water intake for a thermal power plant and a cooling device of a nuclear power plant. .
[0002]
[Prior art]
As this type of prior art, for example, there is what the applicant previously proposed as Japanese Utility Model Application Laid-Open No. 3-79327.
This is because on the sea in front of the cooling water intake on the quay, a net that is inclined downward from the sea to near the bottom of the sea is placed so as to surround the intake, and the lower part is placed between the lower edge of the net and the sea floor. In addition to providing an opening, the lower opening can be opened and closed according to the distribution of the jellyfish in the vertical direction.
In this device, jellyfish located in the surface layer of the water in the daytime etc. are prevented from flowing into the intake port by a net that is inclined downward from the sea to near the bottom of the sea so as to surround the intake port. Cooling seawater can be sufficiently taken in from the lower opening provided between the lower edge of the net and the seabed, and a large amount of jellyfish is generated in the bottom of the water after sunset. Is distributed, the opening and closing net in the lifting position is moved down and moved manually or electrically, and the lower opening is closed to prevent the jellyfish from flowing into the water intake.
[0003]
[Problems to be solved by the invention]
However, in this prior art, a special power for moving up and down the switching network is required, and in order to appropriately move the switching network up and down, it is necessary to constantly monitor floating objects. was there.
[0004]
The object of the present invention is to solve such problems of the prior art, and the purpose of the invention is to make it unnecessary to monitor the state of attachment of floating substances to the net. Without the need for special power, all or part of the net that is normally in a stretched state, prior to the occurrence of a power outage or other serious problem due to the clogging of the net by floating objects To provide a device for preventing floating inflow to the water intake that can be automatically opened and restored to its original deployed position under sufficient flow of seawater and without power. is there.
[0005]
[Means for Solving the Problems]
The floating substance inflow prevention device to the intake port of the present invention is extended between the sea floor and the intake side, more precisely, a fixed side member that contributes to the division of the primary intake port of seawater, and is below the sea level. The primary intake that surrounds the opening of the primary intake and that is provided with a net that reaches the bottom of the sea. The entire net connected to the sea bottom or only the vicinity of the sea bottom is clogged with the primary intake. This is a standing lodging section that is laid down based on the pressure difference between the inside and outside of the mouth.
[0006]
With this device, under the normal stretched state of the net, the net can move jellyfish and other suspended matter between the fixed side member and the seabed, regardless of the distribution of suspended matter under the sea surface. It can be effectively collected under the selected mesh size, while seawater can flow at the required speed through the mesh of nets based on the intake suction force by a cooling device or the like.
[0007]
Note that under such a stretched state of the net, the actual amount of suspended matter collected and the location of the change may vary depending on the time of day, tide level, etc. If there is not, most of the suspended matter collected in the net will be swept away by tidal currents, wave swells, etc., so the net of the net will not be clogged.
[0008]
On the other hand, a large amount of suspended matter is collected in the net at the same time, making it difficult for the seawater to smoothly flow through the net of the net, and the pressure difference between the primary intake side and the opposite side of the net. If this pressure difference increases to overcome the buoyancy of the float that normally maintains the entire net or the vicinity of the seabed in an upright position, the entire net or the area near the bottom of the net As a result, the lodging part is released to the primary intake, so that the seawater passes through the opening and the primary intake under a sufficiently small flow resistance. Can flow smoothly into.
Therefore, by selecting the float buoyancy in relation to the required pressure difference, it is possible to sufficiently prevent the possibility of malfunction of the cooling device or the like.
[0009]
By the way, if all or part of the net is displaced in this manner, suspended matter collected by it will also flow into the primary intake with seawater. A dust removal device is installed between the intake and the secondary intake mainly to remove suspended matter that is small enough to pass through the mesh of the net. This dust removal device will sufficiently remove the dust.
[0010]
And as a result of such smooth flow of seawater, if the pressure difference as described above becomes smaller than the buoyancy of the float, all or part of the net in the lying state under the action of the float itself However, it is automatically stood up again so that the suspended matter can be collected again by that part.
[0011]
Thus, according to this device, when the net is clogged by suspended matter, the standing lodging part automatically falls without monitoring the collection status of the suspended matter or using special power. After the clogging is resolved, the standing lodging part can be automatically erected.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the drawings.
FIG. 1 is a schematic vertical cross-sectional view showing an embodiment in which a part of a net is a standing lodging portion, in which 1 is a quay and 2 is a specific water area protruding from the quay 1 The curtain wall 2 divides the primary intake 4 between the lower end portion and the seabed 3.
[0013]
In addition, the quay 1 is provided with a secondary intake 5 for a water channel leading to a cooling device or the like at a specific location in the enclosed water area by the curtain wall 2. In many cases, the secondary intake 5 and the primary intake are provided. A dust removing device 6 that can be a travel screen or the like is disposed between the water intake 4.
[0014]
Here, the upper end of the curtain wall 2 and the anchor block 7 disposed on the sea floor 3 extend in a direction in which the depth gradually increases as the distance from the curtain wall 2 increases, and 30 to 80 with respect to the sea floor 3. A net that reaches the seabed 3 by being connected by a plurality of ropes 8 having an angle of 0 °, and surrounding the curtain wall 2 around the curtain wall 2 within a plane area reaching the wall surface 1a of the quay 1 9 is arranged, and the net 9 surrounds the primary intake 4 that opens below the sea surface.
[0015]
In addition, here, the portion near the seabed of such a net 9, for example, a portion of 1 to 1.8 m in a vertical height from the seabed is a standing lodging portion 10, and the lower end is connected to the anchor block 7. With the float 11 having an appropriate buoyancy connected to the upper end of the standing lodging portion 10 on the inner side of the slope of the rope 8, the standing body 10 is normally maintained in the standing state in which the float 11 is the upper limit position. In addition, although this standing position of the standing lodging part 10 can also be specified by making the float 11 contact | abut to the rope 8, the float 11 of the float 11 to the rope 8 by a tidal current, a wave swell, etc. now exists. In order to eliminate tangling and other fears, and to make the standing posture of the standing / falling portion 10 sufficiently stable at all times, as shown in the drawing, an anchor rope 12 extending in the direction opposite to the rope 8 is used. It is preferable to specify the upper limit position, and the standing lodging part 10 can be erected along the rope 8 under the selection of the length of the anchor rope 12.
[0016]
By the way, instead of directly connecting the upper and lower ends of the standing lying portion 10 to each of the float 11 and the anchor block 7, it is possible to extend the standing lying portion 10 on a rope connected to each of them.
[0017]
In the apparatus configured as described above, when sucking the seawater outside the net 9 through the primary and secondary intakes 4 and 5 based on the intake suction force by the cooling device or the like, The suspended matter is collected by the net 9, and the suspended matter having a small size that is not collected by the net 9 is sufficiently removed by the dust removing device 6.
[0018]
Here, the trapping of such suspended matter by the net 9 causes a large amount of suspended matter to accumulate on the net before the collected suspended matter is swept away by tides, etc. Is generated, the intake suction force of the cooling device or the like causes a negative pressure on the intake ports 4 and 5 side from the net 9, and the opposite side becomes a positive pressure under the influence of the water head pressure or the like.
[0019]
In this case, the force acting on the standing lodging portion 10 based on the pressure difference between the inside and the outside of the net 9, more precisely, in addition to this, in addition to this, floating matter accumulated on the standing lodging portion 10 When the weight of the float 11 wins the buoyancy of the float 11, the float 11 sinks, and accordingly, the standing lodging section 10 is displaced around the lower end connecting section as shown by a temporary wire in the figure. Then, when the standing lodging part 10 is displaced in this manner, seawater smoothly flows into the inside of the net 9 through the lodging part, and a sufficient amount of seawater is supplied to the cooling device etc. The pressure difference gradually decreases.
[0020]
In addition, when seawater flows into the inside of the net 9 in a large amount at a high speed through the lodging portion due to the displacement of the standing lodging section 10, suspended matter collected in the standing lodging section 10 in the seawater. These suspended matters can be sufficiently removed by the dust removing device 6.
[0021]
As a result, when the force acting on the standing lodging portion 10 becomes smaller than the buoyancy of the float 11 based on the pressure difference between the inside and outside of the net 9, the float 11 re-lifts and the standing lodging portion 10 reaches the position shown in the figure. It is possible to re-collect floating matters by the standing lodging portion 10 after the standing displacement.
[0022]
Thus, in this apparatus, when the net 9 is clogged to a predetermined amount or more, the standing / falling section 10 can be installed without monitoring the clogging state or requiring special power based on the pressure difference between the inside and outside of the net 9. It is possible to automatically displace the body, and it is possible to automatically make the standing displacement based on the elimination of the pressure difference.
[0023]
FIG. 2 is a schematic longitudinal sectional view showing another embodiment of the present invention.
The curtain wall 2 is provided with a hood plate 21 that protrudes from the upper edge of the primary intake 4 to the opposite side of the secondary intake 5, and the above-described standing lodging portion 10 is provided below the hood plate 21. In the same manner as described above, a net 22 that is laid down is disposed, and this net 22 is extended between the curtain wall 2 and the seabed 3 via the hood plate 21, and the lower end of the curtain wall 2. Surround the primary water intake 4 of the part.
[0024]
Here, the upper and lower ends of the net 22 are connected 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 25, it is positioned on the underside of the hood plate 21 in the immediate vicinity thereof.
According to this configuration, the entire net 22 can fall and stand up and displace in the same manner as the above-described standing and falling portion 10, and the required amount of liquid can be sufficiently smoothed under the same effect as in the previous case. Can take water.
[0025]
FIG. 3 shows an embodiment in which the hood plate 21 is removed from the place shown in FIG. 2, which directly surrounds the primary water intake 4 with the net 22 and shows the entire net 22 in FIG. 2. In the same way, it is possible to fall and stand up and displace.
[0026]
FIG. 4 is a schematic vertical cross-sectional view showing still another embodiment, which opens a secondary intake 5 to the seabed 3 and a frame plate 31 disposed above the intake 5; The first intake 4 is opened between the flange of the intake 5.
Here, when the net 32 is connected to the peripheral edge of the frame plate 31 and the seabed 3 and is extended in a substantially conical shape, the portion near the seabed of the net 32 is substantially the same as that shown in FIG. And the position of the float 34 at the upper end thereof is regulated by the anchor rope 35.
Even in the case of such a configuration, the same operational effects as those shown in FIGS. 1 and 2 can be brought about under the action of the standing lodging portion 33.
[0027]
【The invention's effect】
As is apparent from the above description, according to the present invention, the standing lodging portion connected to the seabed is displaced and displaced mainly based on the inner and outer pressure difference with respect to the water intake, and the pressure difference is predetermined. By moving upright when the value falls below the specified value, monitoring the trapping status of floating objects on the net, operating power of the standing lodging, etc. are unnecessary, and the standing lodging is automatically performed as expected. Can be displaced.
[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 cross-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 Quay wall 1a Wall surface 2 Curtain wall 3 Sea floor 4 Primary intake 5 Secondary intake 6 Dust removal device 7, 24 Anchor block 8, 25 Rope 9, 22, 32 Net 10, 33 Standing lodging part 11, 23, 34 Float 12 , 35 Anchor rope 21 Hood plate 31 Frame plate

Claims (1)

Floating matter to the intake port that is extended between the sea floor and the fixed side member that contributes to the intake compartment, and that surrounds the intake opening that opens below the sea surface and that has a net that reaches the sea floor. An inflow prevention device,
The entire net connected to the seabed or the vicinity of the seabed is a standing lodging section that is fallen on the basis of the pressure difference between the inside and outside of the water intake under clogging. Floating substance inflow prevention device.

Images