JP5378105B2 - Jellyfish inflow reduction network - Google Patents

Description

  The present invention relates to a jellyfish inflow reduction network for reducing the number of jellyfish inflows into a water intake mechanism that pumps seawater.

  In a thermal power / nuclear power plant or the like, for example, in order to cool a heat generating device such as a turbine, it is necessary to guide the seawater to secure the cooling water. In this case, if the foreign matter which consists of marine organisms, such as a jellyfish contained in seawater, and garbage, is drawn in, cooling efficiency will worsen or an apparatus will be damaged. For this reason, there is equipment for regulating the inflow of foreign matter upstream of the pumping pump (Patent Document 1).

  The thing of patent document 1 is providing the dust removal apparatus for removing and collect | recovering the foreign material mixed in seawater in the pump 101 vicinity which pumps up seawater, as shown in FIG. And the water intake 103 of this pump 101 and the dust removal apparatus comprise the water intake mechanism 102 (patent document 2). The dust removing device includes a rotary screen 104 provided in the vicinity of the water intake 103 and a bar screen 105 provided on the upstream side of the rotary screen 104. The rotary screen 104 rotates to draw up relatively small foreign matter while partially containing seawater, and discharge the foreign matter. The bar screen 105 is a fence-like member and removes relatively large foreign matters.

  Further, as shown in FIG. 6, jellyfish inflow prevention means 110 may be provided on the upstream side of the water intake mechanism 102 so as to surround the plurality of water intake mechanisms 1. The jellyfish inflow prevention means 110 includes a net member 111 provided on the ocean 100 and a curtain wall 112 provided on the downstream side of the net member 111. In other words, foreign matter that flows downstream by the net member 111 is reduced, foreign matter that flows further downstream by the curtain wall 112 is reduced, and only low-temperature deep water is guided downstream.

JP 2004-232379 A

  However, it cannot be said that the above-mentioned facilities (the net member 111, the curtain wall 112, the bar screen 105, and the rotary screen 104) alone are sufficient as countermeasures against jellyfish. In particular, when a large amount of jellyfish is generated, there is a problem that the existing facilities alone cannot cope with a large amount of jellyfish and cause power generation problems. When the pump is replaced with a high-performance pump, the processing capacity of the rotary screen 104 may be insufficient with respect to the pumping capacity of the pump. Thereby, it is necessary to replace each said equipment with the thing according to the processing capacity of a pump. However, since each said equipment is large sized, when replacing each equipment, there was a problem that replacement work became large and cost was required.

  Therefore, in view of the above problems, the present invention can be easily installed in existing equipment, and the effect of reducing the number of jellyfish flowing into the water intake mechanism can be stably maintained over a long period of time. Provide an inflow reduction network.

  The jellyfish inflow reduction network of the present invention is disposed between a jellyfish inflow prevention means for regulating the inflow of jellyfish to a water intake mechanism for supplying seawater to other devices provided on the ocean, and the water intake mechanism, A side opening is formed on the side facing the water intake mechanism, and a lower opening is formed in the lower side to surround the water intake mechanism, and the number of inflows of the jellyfish that has passed through the jellyfish inflow prevention means to the water intake mechanism. A jellyfish inflow reduction network to be reduced, comprising a main body portion arranged in a substantially vertical direction, and a return portion formed by folding back a lower portion of the main body portion to the outside. The return portion and a main body in the vicinity of the return portion In the lower part, the jellyfish that has approached the water intake mechanism is a reservoir that restricts the inflow of the jellyfish from the lower opening into the water intake mechanism.

  In the jellyfish inflow reduction network of the present invention, when the jellyfish that has passed through the upstream jellyfish inflow prevention means reaches the vicinity of the water intake mechanism, the water intake mechanism is surrounded so that a part of the entrance path to the water intake mechanism is shut off. The number of jellyfish flowing into the mechanism can be reduced. In this case, a lower opening is formed in the lower part, and it is not installed up to the seabed, so it is lightweight and compact. Here, the water intake mechanism includes not only a water intake port of a pump for pumping seawater but also a dust removing device (for example, a rotary screen or a bar screen) provided in the vicinity of the pump.

  By forming a reservoir part with the return part and the lower part of the main body part near the return part, it becomes a bag shape that closes downward, so that the jellyfish that reaches above the reservoir part is blocked from moving downward And you can keep the jellyfish in that position.

  The lower end of the main body can be expanded outward with respect to the upper end of the main body. Thereby, even if it tries to change the shape of a net | network by the inflow resistance of the intake mechanism of seawater, and the jellyfish to stop, the shape can be maintained.

  A floating member may be provided at the upper end of the main body, and a weight member may be provided at the lower end of the main body, and the return portion may be formed by being bent through the weight member. Thereby, a main-body part can be arrange | positioned in the water surface vicinity, and a jellyfish can be made not to exist above.

  The bent portion of the return portion can be maintained by being connected to an installation mechanism fixed to the seabed and installed in the vicinity of the jellyfish inflow prevention means via a connecting body. That is, the main body portion and the return portion are supported from the upstream side.

  According to the jellyfish inflow reduction network of the present invention, since the lower opening is formed in the lower part, it is light and compact, and can be installed on the ocean at the time of installation, and installation by diving is possible. It becomes unnecessary. Thereby, it can be easily installed in existing equipment, and the number of jellyfish inflows into the water intake mechanism can be reduced at low cost.

  By forming a reservoir portion with the main body portion and the return portion to form a bag that closes downward, it is possible to prevent the jellyfish that has reached above the reservoir portion from moving toward the lower opening. Thereby, the effect of reducing the number of jellyfish flowing into the water intake mechanism can be stably maintained over a long period of time. In addition, if the jellyfish stays in the reservoir for a long period of time, there is an advantage that the free movement of the jellyfish is restricted, and the jellyfish naturally disappears in the reservoir and the labor for processing the jellyfish can be saved.

  If the lower end portion is expanded outward with respect to the upper end portion, even if the shape of the net is about to change, the shape can be maintained, and the number of inflows of the jellyfish into the water intake mechanism can be reduced more stably. it can.

  When the main body is disposed near the water surface, there can be no jellyfish in the upper part, and the flow path of the jellyfish to the water intake mechanism can be blocked efficiently. In addition, since it is not necessary to close the upper portion, the weight is further reduced and the material cost can be reduced.

  When connected to the installation mechanism via the connecting body and maintaining the bent state of the return portion, it will be supported from the upstream side, effectively positioning the return portion outside the main body portion, and over a long period of time. The shape can be maintained stably. Thereby, the number of inflows to the jellyfish water intake mechanism can be stably reduced over a long period of time.

It is a simplified top view which shows the use condition of the jellyfish inflow reduction network of this invention. It is an AA arrow line view of the said FIG. It is a simplified side view in the sea of the jellyfish inflow reduction network of the present invention. It is the AA arrow line view of the said FIG. 1 which shows the method of reducing the jellyfish which flows in into a water intake mechanism. It is a simplified side view which shows a water intake mechanism. It is the schematic which shows the conventional jellyfish processing system.

  Hereinafter, the best mode for carrying out the present invention will be described.

  The jellyfish inflow reduction network of the present invention is provided on the ocean 50 (see FIG. 1), and is disposed between the jellyfish inflow prevention means 20 and the water intake mechanism 1, and the jellyfish that has passed through the jellyfish inflow prevention means 20 is the water intake mechanism. When reaching the vicinity, the number of jellyfish flowing into the water intake mechanism 1 is reduced. The intake mechanism 1 is a mechanism for supplying seawater as cooling water to other devices (not shown) (for example, a turbine provided in a power plant). In this embodiment, the intake port 2 of the pump (see FIG. 2). ), A rotary screen 3 and a bar screen 4.

  As shown in FIG. 1, the jellyfish inflow prevention means 20 is installed so as to surround the plurality of water intake mechanisms 1, and the net member 21 provided on the ocean 50 and the downstream side of the net member 21 (the intake mechanism side). And a curtain wall 22 provided on the wall. As shown in FIG. 2, the net member 21 is stretched from the water surface to a depth of, for example, 5 m. This net member 21 can reduce the number of jellyfish entering the downstream side. The curtain wall 22 is a wall surface that opens on the seabed side, and blocks the flow path on the water surface side. In the present embodiment, as shown in FIG. 2, the curtain wall 22 is provided along the installation mechanism 23 embedded in the seabed 6. The installation mechanism 23 includes a steel pipe pile 24 and a jetty 23 provided on the upper portion of the steel pipe pile 24. By providing the curtain wall 22, jellyfish floating near the water surface and foreign matter can be blocked from entering the downstream side, and only deep water having a low temperature can be sent to the water mechanism 1.

  The jellyfish inflow reduction network of the present invention is stretched near the water surface (in this embodiment, 1 m from the water surface), and a side opening 15 (see FIG. 1) is formed on the side facing the water intake mechanism 1. At the same time, a lower opening 7 (see FIG. 2) is formed below to make the water intake mechanism 1 in an enclosed shape. In this case, since it is not installed up to the seabed 6, it is light and compact. In addition, the depth from the water surface of the jellyfish inflow reduction network can be variously set according to the shortage of the processing capacity of the water intake mechanism 1 (particularly, the rotary screen 3), for example. That is, when the processing capacity of the rotary screen 3 is far inferior to the processing capacity of the pump 2, the depth of the jellyfish inflow reduction network is increased. On the other hand, when the processing capacity of the rotary screen 3 is slightly inferior to the processing capacity of the pump 2, the depth of the jellyfish inflow reduction network is reduced. In this manner, the depth from the water surface can be set according to the capacity of the water intake mechanism 1 and the usage environment, and the number of jellyfish inflows into the water intake mechanism 1 can be reduced by a desired amount.

  As shown in FIG. 3, the jellyfish inflow reduction network includes a main body portion 8 (2 m in this embodiment) arranged in a substantially vertical direction, and a return portion 9 (main book) formed by folding the lower portion of the main body portion 8 outward. In the embodiment, 0.5 m) is provided. The main body portion 8 and the return portion 9 are constituted by the same member as the net member 21 of the jellyfish inflow prevention means 20. The pool portion 10 is formed by the return portion 9 and the lower portion of the main body near the return portion. Since the pool portion 10 has a bag shape that closes downward, the jellyfish that reaches the upper side of the pool portion 10 can block the path of movement downward, and can keep the jellyfish in that position.

  Next, a method for installing the jellyfish inflow reduction network of the present invention on the upstream side of one intake mechanism 1 will be described. In addition, as shown in FIG. 1, when it has the some intake mechanism 1, each intake mechanism 1 is provided in the independent intake path 11, respectively.

  As shown in FIG. 1, the upstream side of the jellyfish inflow reduction network is, for example, 15 ° with respect to the inflow direction of seawater, and the side opening 15 is formed on the downstream side of the jellyfish inflow reduction network, The water intake mechanism 1 is a surrounding shape. As described above, when the upstream side of the jellyfish inflow reduction network has an acute angle, the jellyfish can be guided in a direction having an angle with respect to the inflow direction of seawater, and the jellyfish can be easily guided to the outside of the jellyfish inflow reduction network.

  Further, as shown in FIG. 3, a floating member 13 is provided at the upper end portion of the main body portion 8, and a chain-like weight member 14 is provided at the lower end portion of the main body portion 8. That is, the return portion 9 is formed by bending the net through the weight member 14. Thereby, the main-body part 8 can be arrange | positioned in the water surface vicinity, and since a water surface exists upwards, it can be set as a thing without a jellyfish. And the front-end | tip part of the floating member 13 and the return part 9, and the installation mechanism 23 are connected with the coupling body 12 which consists of a mooring rope, and the front-end | tip part of the floating member 13 and the return part 9 is supported from an upstream side. Thus, the bent state of the return portion 9 is maintained. Thereby, the lower end part (weight member 14) of the main-body part 8 shall spread outside with respect to the upper-end part (floating member 13) of the main-body part 8. FIG. In this case, the floating member 13 is set to 45 ° with respect to the weight member 14. Thereby, even if it tries to change the shape of a net | network by the inflow resistance of seawater and the jellyfish to stop, the shape can be maintained.

  Next, a method for reducing the number of jellyfish flowing into the water intake mechanism 1 using the jellyfish inflow reduction network of the present invention will be described with reference to FIG. The jellyfish existing offshore (for example, 30 cm to 60 cm) is blocked on the water surface side by the jellyfish inflow prevention means 20 including the net member 21 and the curtain wall 22 stretched on the upstream side, and the path entering the downstream side is blocked. The Thereby, as a path | route which a jellyfish approachs downstream, it becomes a deep layer part as shown to the arrow A and the arrow B. FIG. This jellyfish inflow prevention means 20 reduces the number of jellyfish entering the downstream side.

  Of the jellyfish that have passed through the jellyfish inflow prevention means 20 and have reached the vicinity of the water intake mechanism as indicated by the arrow C, the jellyfish near the water surface are prevented from flowing into the net by the main body 8 of the jellyfish inflow regulation network of the present invention. It is regulated and guided to the outside of the net. Thereby, the number of jellyfish which flows into water intake mechanism 1 can be reduced. Moreover, since the pool part 10 is provided, while the jellyfish which reached | attained upwards from the pool part 10 can interrupt | block the path | route which moves below, a jellyfish can be stopped in the position. In this case, there is an advantage that the free movement of the jellyfish is regulated so that the jellyfish is naturally extinguished in the reservoir 10 and the labor for processing the jellyfish can be saved.

  In the present invention, when the jellyfish that has passed through the upstream jellyfish inflow prevention means 20 reaches the vicinity of the water intake mechanism, the water intake mechanism 1 is enclosed and a part of the entrance path to the water intake mechanism 1 is blocked. It is possible to reduce the number of jellyfish that flow into the water. In this case, a lower opening 7 is formed in the lower part and is not installed up to the seabed 6, so that it is light and compact, and can be installed offshore during installation. Installation by is unnecessary. Thereby, it can install easily in the existing equipment and can reduce the inflow number of the jellyfish to the water intake mechanism 1 at low cost.

  By forming the reservoir portion 10 with the return portion 9 and the lower portion of the main body portion in the vicinity of the return portion 9, the jellyfish that has reached the upper side of the reservoir portion 10 moves downward. The path can be blocked and the jellyfish can be kept in that position. Thereby, it can prevent that a jellyfish moves to the lower opening part side, and can maintain stably the effect which reduces the number of the jellyfish which flows in into the water intake mechanism 1 over a long period of time.

  Since the lower end of the main body 8 is expanded outward with respect to the upper end of the main body 8, the shape of the net is changed even if the shape of the net is changed due to the inflow resistance of the seawater intake mechanism 1 and the jellyfish to be retained. Can be maintained. Thereby, the number of inflows of the jellyfish into the water intake mechanism 1 can be more stably reduced.

  A floating member 13 is provided at the upper end portion of the main body portion 8, and a weight member 14 is provided at the lower end portion of the main body portion 8, and the return portion is formed by being bent through the weight member 14. Thereby, the main-body part 8 can be arrange | positioned in the water surface vicinity, a jellyfish can be made not to exist in the upper direction, and the distribution path to the water intake mechanism side of a jellyfish can be interrupted | blocked efficiently. In addition, since it is not necessary to close the upper portion, the weight is further reduced and the material cost can be reduced.

  Since it is connected to the installation mechanism 23 which is fixed to the seabed 6 and installed in the vicinity of the jellyfish inflow prevention means 20 via the connecting body 12 and the bent portion 9 is maintained in the bent state, The return part 9 is supported from the upstream side. Thereby, while the return part 9 can be effectively located outside the main-body part 8, a shape can be maintained stably over a long period of time. Thereby, the number of inflows of the jellyfish into the water intake mechanism 1 can be stably reduced over a long period of time.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications are possible. For example, when the net of the present invention is provided, the upstream angle is an acute angle. If there is, it can be set arbitrarily. The angle between the floating member 13 and the weight member 14 can also be set arbitrarily. In the embodiment, the jellyfish inflow reduction net is configured by the same one as the net member 21 of the jellyfish inflow prevention means 20, but may be configured by another one. The jellyfish inflow prevention means 20 may be only the net member 21 or only the bar screen 22. In the embodiment, the water intake mechanism 1 includes the water intake, the rotary screen 3, and the bar screen 4. However, the water intake mechanism 1 includes only the water intake, the water intake and the rotary screen 3, or the water intake. Or a bar screen 4. In the above embodiment, the connecting body 12 is connected to the distal end portion of the return portion 9, but it may be connected to the weight member 14.

DESCRIPTION OF SYMBOLS 1 Water intake mechanism 2 Opening part 4 Reservoir 7 Lower opening part 8 Main body part 9 Return part 10 Reservation part 12 Mooring rope 13 Floating member 14 Weight member 15 Side part opening part 20 Jellyfish inflow prevention means 23 Installation mechanism

Claims (4)

A jellyfish inflow prevention means for restricting the inflow of jellyfish to an intake mechanism for supplying seawater to other devices provided on the ocean, and disposed between the intake mechanism,
A side opening is formed on the side facing the water intake mechanism, and a lower opening is formed in the lower side to surround the water intake mechanism, and the number of inflows of the jellyfish that has passed through the jellyfish inflow prevention means to the water intake mechanism. A jellyfish inflow reduction network to reduce,
A main body part arranged in a substantially vertical direction and a return part formed by folding back the lower part of the main body part to the outside. The return part and the lower part of the main body part near the return part approached the water intake mechanism. A jellyfish inflow reduction network characterized in that the jellyfish is a reservoir that restricts the jellyfish from flowing into the water intake mechanism from the lower opening.   The jellyfish inflow reduction network according to claim 1, wherein a lower end portion of the main body portion is expanded outward with respect to an upper end portion of the main body portion.   3. A floating member is provided at an upper end portion of the main body portion, a weight member is provided at a lower end portion of the main body portion, and a return portion is formed by being bent through the weight member. Jellyfish inflow reduction network.   The installation mechanism fixed to the seabed and installed in the vicinity of the jellyfish inflow prevention means is connected via a connecting body to maintain the bent state of the return portion. Any one of the jellyfish inflow reduction networks.

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