Floating object repelling device and method for nuclear power plant

Abstract

The invention relates to the field of nuclear power plant unit water intakes, in particular to a nuclear power plant floating object repelling device and method, the device comprises a floating bridge, the floating bridge surrounds the outer side of the water intakes, the floating bridge comprises a plurality of floating bridge units, and each floating bridge unit comprises a floating mat, an inner side anchor chain, an outer side anchor chain and an electric rotating impeller. An inner side anchor chain is arranged below one side, facing the water intake, of the floating mat, and an outer side anchor chain is arranged below one side, facing the water body, of the floating mat; an electric rotating impeller is installed on the side, facing the water body, of the floating mat and drives the water body to rotate in the direction opposite to the flowing direction of the tide water, and the floating objects are driven away from the water taking opening. Through guiding of the device, aquatic plants and other sundries floating on the water surface of the water intake are far away from the water intake of the power plant through water flow inertia, it is ensured that the aquatic plants are not sucked by the water intake, and therefore floating object repelling is achieved.

Description

Technical Field

[0001] The present invention relates to the field of water intake of nuclear power plant units, and particularly to a floating object removal device and a removal method for a nuclear power plant. Background Art

[0002] For nuclear power plants using the Haihe River water source as the ultimate heat sink, the floating waterweeds and sundries on the water surface pose a real threat to the cold source safety of the nuclear power plant units. If a large amount of floating waterweeds and sundries on the water surface are not intervened in time, a large amount of waterweeds may enter the heat exchange system, which will not only affect the safety and stability of operating equipment and systems, but also block the flow channels of the cold source system, resulting in a significant decrease in the heat exchange capacity of the nuclear power plant cold source system. There have been many unplanned power reduction events in nuclear power plants caused by the floating and aggregation of waterweeds at the water intake. In some cases, it even poses a threat to the operation of the safety service water system of the nuclear power plant. To eliminate the impact of floating waterweeds at the water intake on the nuclear power plant, the cold source plan set by the nuclear power plant requires that when waterweeds are visually found to be aggregated at the water intake, the main control room of the nuclear power plant notifies the relevant assistance departments, and fishing boats are used to manually fish with fishing nets.

[0003] In the prior art, the method of manual fishing has low efficiency and there are certain safety hazards in manual operations on the sea surface. Especially during typhoon periods, which are often the moments when a large amount of waterweeds are aggregated at the water intake. However, due to the adverse weather conditions, fishing boats cannot go to sea for operations. At this time, the nuclear power plant cold source system can only remove waterweeds through existing blocking facilities and decontamination devices. However, limited by the processing capacity of these devices, once the influx speed of waterweeds and sundries exceeds the processing capacity of the devices, it will inevitably lead to waterweeds entering the power plant cold source system, and the power plant can only passively reduce power, shut down or even shut down the reactor, and even threaten the export of the residual power of the nuclear power plant core. In addition, during normal operation, operators need to track in real time through the water intake monitoring, the differential pressure alarm of the drum screen and the situation of waterweeds and sundries on site. After the alarm is triggered, if the floating waterweeds cannot be driven away at the front end of the water intake, after the floating waterweeds enter the cold source water intake, the nuclear power plant can only intervene based on the existing blocking and decontamination systems. Summary of the Invention

[0004] The present invention provides a floating object removal device and a removal method for a nuclear power plant, which are used to solve the problems in the prior art that manual fishing of waterweeds by fishing boats is required at the water intake of the nuclear power plant, resulting in labor consumption, low efficiency and untimely removal.

[0005] The technical solution of the present invention is as follows:

[0006] The present invention provides a device for driving away floating objects in a nuclear power plant. The device includes a floating bridge that surrounds the outside of the water intake. The floating bridge consists of several floating bridge units. Each floating bridge unit includes a floating raft, an inner anchor chain, an outer anchor chain, and an electric rotary impeller. The inner anchor chain is provided below one side of the floating raft facing the water intake, and the outer anchor chain is provided below one side of the floating raft facing the water body. An electric rotary impeller is installed on one side of the floating raft facing the water body, and the electric rotary impeller drives the water to rotate in the direction opposite to the direction of the tide flow, driving the floating objects away from the water intake.

[0007] In some embodiments, the floating bridge surrounds the outside of the water intake in a trapezoidal shape and is formed by connecting several straight lines.

[0008] In some embodiments, inner guardrails and outer guardrails are installed at the upper end of the floating raft of the floating raft unit. After several floating bridge units form the floating bridge, a pedestrian passage is formed between the inner guardrail and the outer guardrail.

[0009] In some embodiments, the device is also provided with a monitoring tower, a camera, and a tide gauge. The camera and the tide gauge are installed on the monitoring tower, and the tide gauge monitors the tide level to determine the direction of the tide flow.

[0010] In some embodiments, an electric water pump is installed on one side of the floating bridge unit facing the water body. The water inlet of the electric water pump is at the bottom of the pump, and the outlet direction is towards the side of the floating bridge unit facing the water body.

[0011] In some embodiments, the water outlet nozzle of the electric water pump can adjust the water spraying direction, and the adjustment angle of the water outlet nozzle is ±60°.

[0012] In some embodiments, multiple electric rotary impellers and electric water pumps can be installed on the floating bridge unit.

[0013] The present invention provides a method for driving away floating objects in a nuclear power plant. The method includes:

[0014] The tide gauge on the monitoring tower measures the tide level of the tide, judges the direction of the tide flow according to the rising and ebbing tides, and rotates the electric rotary impeller according to the direction of the tide flow, so that the electric rotary impeller drives the water to flow in the direction opposite to the direction of the tide flow, thereby making the floating objects move away from the water intake; when floating objects are found near the floating bridge during inspection, start the electric water pump to spray water, thereby making the floating objects move away from the water intake.

[0015] In some embodiments, when floating objects are found near the floating bridge during inspection and the electric water pump is started to spray water to make the floating objects move away from the water intake, it specifically includes: the camera on the monitoring tower monitors the number of floating objects around the floating bridge. When floating objects are detected within 3 meters of the floating bridge by the camera, start the electric water pump and rotate the water outlet nozzle of the electric water pump, and the electric water pump sprays water to make the floating objects move away from the water intake; when no floating objects are detected within 3 meters of the floating bridge by the camera, stop the electric water pump.

[0016] Implementing the present invention has the following beneficial effects:

[0017] The present invention provides a nuclear power plant floating object repelling device and a repelling method. The floating bridge of the device is composed of several floating bridge units, and electric rotating impellers or electric water pumps can be installed on the floating bridge units. The electric rotating impeller can control the rotation direction according to the rising or falling tide, and the electric water pump can control the start or stop according to the number of floating objects in the seawater. Through the guidance of the repelling device, sundries such as waterweeds on the water surface of the water intake are moved away from the power plant water intake by the inertia of the water flow, ensuring that these waterweeds are not sucked by the water intake, thereby realizing the repelling of floating objects. Through the above device, the manpower consumption is reduced, and the influence of floating objects such as waterweeds on the nuclear power plant is effectively reduced. Description of the Drawings

[0018] Figure 1 Schematic diagram of a floating bridge unit with an electric rotating impeller of a nuclear power plant floating object repelling device proposed in an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of a floating bridge unit with an electric water pump of a nuclear power plant floating object repelling device proposed in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of a nuclear power plant floating object repelling device proposed in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of a monitoring tower of a nuclear power plant floating object repelling device proposed in an embodiment of the present invention;

[0022] Description of the Drawings: 1. Floating raft; 2. Inner guardrail; 3. Outer guardrail; 4. Inner anchor chain; 5. Outer anchor chain; 6. Electric rotating impeller; 7. Electric water pump; 8. Monitoring tower; 9. Camera; 10. Tide gauge; 11. Water intake; 12. Floating bridge. Detailed Embodiments

[0023] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] As Figures 1 to 4 shown, the present invention provides a nuclear power plant floating object repelling device, which includes a floating bridge 12 and a monitoring tower 8. The floating bridge 12 surrounds the outside of the water intake 11 in a trapezoidal shape, as Figure 3As shown in the figure, one side of the water intake 11 is close to the shore, and the other three sides are surrounded by a floating bridge 12 in a trapezoidal shape. The trapezoidal surrounding method requires a shorter length of the floating bridge 12 than a rectangular shape, reducing the number of required floating bridge units. The side of the floating bridge unit facing the ocean is the outer side, and the side facing the water intake 11 is the inner side.

[0025] As Figure 3 shown in the figure, the floating bridge 12 is composed of floating bridge units. A plurality of floating bridge units are arranged linearly and connected together, completely enclosing the water intake 11 to prevent floating objects in the seawater from reaching the inner side of the floating bridge 12 and then entering the water intake 11. The floating bridge unit consists of a floating raft 1, an inner guardrail 2, an outer guardrail 3, an inner anchor chain 4, and an outer anchor chain 5. The floating raft 1 serves as the main body of the floating bridge unit. The inner anchor chain 4 is installed below the inner side, and the outer anchor chain 5 is installed below the outer side. The inner anchor chain 4 and the outer anchor chain 5 are connected to the underwater cement anchor blocks to fix the floating bridge unit and do not affect the floating bridge 12 from always floating on the seawater surface according to the tide level change. An inner guardrail 2 is installed above the inner side of each floating raft 1, and an outer guardrail 3 is installed above the outer side. After several floating bridge units form the floating bridge 12, a complete guardrail will be connected on the inner and outer sides above the floating bridge 12. The upper part of the floating bridge 12 can be used as a pedestrian passage, and the guardrails on both sides play a protective role. When the number of floating objects in the seawater exceeds the driving ability of the driving device, personnel can stand on the floating bridge 12 for manual fishing and transport it to the seawall through the floating bridge 12.

[0026] The floating bridge unit is also provided with an electric rotating impeller 6. The electric rotating impeller 6 is installed on the outer side of the floating raft 1 of the floating bridge unit, and the electric rotating impeller 6 can rotate forward or backward. When the tide gauge 10 on the monitoring tower 8 monitors the tide flow, the electric rotating impeller 6 drives the water body to flow in the same direction as the tide flow, which will accelerate the flow of floating objects and make the floating objects move away from the water intake 11.

[0027] As Figure 4 shown in the figure, a camera 9 and a tide gauge 10 are installed on the monitoring tower 8. When the tide gauge 10 monitors the rising tide level, it is a flood tide. As Figure 3 shown, during the flood tide, the seawater flows in the direction marked as the flood tide direction in Figure 3 . At this time, the electric rotating impeller 6 rotates forward, that is, rotates clockwise when looking down at the electric rotating impeller 6, driving away the floating objects in the seawater; when the tide gauge 10 monitors the falling tide level, it is an ebb tide. During the ebb tide, the seawater flows in the direction marked as the ebb tide direction in Figure 3 . At this time, the electric rotating impeller 6 rotates backward, that is, rotates counterclockwise when looking down at the electric rotating impeller 6, driving away the floating objects in the seawater.

[0028] In some embodiments, the floating bridge unit is also provided with an electric water pump 7. The electric water pump 7 is installed outside the floating bridge unit. According to the number of floating objects around the floating bridge 12 monitored by the camera 9, the electric water pump 7 is started when the number of floating objects is detected to be large, and the electric water pump 7 is stopped when the number of floating objects is detected to be small. The water inlet of the electric water pump 7 is at the bottom of the pump, and the water outlet direction is to spray water outward. The water outlet nozzle can adjust the water spraying direction, and the adjustment angle is ±60°. When the water outlet nozzle of the electric water pump 7 is at 0°, it is perpendicular to the floating row 1. Each floating bridge unit can be installed with an electric rotating impeller 6 or an electric water pump 7. As Figure 3 shown, the floating bridge unit can also be installed with an electric rotating impeller 6 and an electric water pump 7 at the same time, and the electric rotating impeller 6 and the electric water pump 7 are installed in a 1:1 ratio. The installation ratio of the electric rotating impeller 6 and the electric water pump 7 can be determined according to the types and quantities of floating objects in the seawater.

[0029] The present invention provides a method for driving away floating objects in a nuclear power plant, which includes:

[0030] The tide gauge 10 on the monitoring tower 8 measures the tide level, judges the tide flow direction according to the flood tide and ebb tide conditions, and rotates the electric rotating impeller 6 according to the tide flow direction, so that the electric rotating impeller 6 drives the water body to flow in the opposite direction to the tide flow direction, thereby making the floating objects move away from the water intake 11.

[0031] The camera 9 on the monitoring tower 8 monitors the number of floating objects around the floating bridge 12. When the camera 9 detects that there are floating objects within 3 meters of the floating bridge 2, the electric water pump 7 is started and the water outlet nozzle of the electric water pump 7 is rotated. The electric water pump 7 sprays water to make the floating objects move away from the water intake 11. When the camera 9 checks that there are no floating objects within 3 meters of the floating bridge 12, the electric water pump 7 is stopped.

[0032] The above embodiments only represent several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A floating object removal device for a nuclear power plant, characterized in that: The device comprises a floating bridge (12), the floating bridge (12) surrounds the outside of the water intake (11), the floating bridge (12) comprises a plurality of floating bridge units, the floating bridge units comprise a floating row (1), an inner anchor chain (4), an outer anchor chain (5) and an electric rotary impeller (6), the inner anchor chain (4) is arranged below the side of the floating row (1) facing the water intake (11), and the outer anchor chain (5) is arranged below the side of the floating row (1) facing the water body; the electric rotary impeller (6) is installed on the side of the floating row (1) facing the water body, and the electric rotary impeller (6) drives the water body to flow in the direction of the tidal flow.

2. A floating object removal device for a nuclear power plant according to claim 1, characterized in that: The floating bridge (12) surrounds the outside of the water intake (11) in a trapezoidal shape, and the floating bridge (12) is formed by connecting a plurality of straight lines.

3. A floating object removal device for a nuclear power plant according to claim 2, characterized in that: The upper end of the floating row (1) of the floating row (1) unit is installed with an inner guardrail (2) and an outer guardrail (3). After a plurality of the floating bridge units form a floating bridge (12), a pedestrian passage is formed between the inner guardrail (2) and the outer guardrail (3).

4. A floating object removal device for a nuclear power plant according to claim 1, characterized in that: The device is also provided with a monitoring tower (8), a camera (9) and a tide gauge (10). The monitoring tower (8) is provided with the camera (9) and the tide gauge (10). The tide gauge (10) monitors the tide level to determine the direction of tidal water flow.

5. A floating object removal device for a nuclear power plant according to claim 4, characterized in that: An electric water pump (7) is installed on the side of the floating bridge unit facing the water body, the water inlet of the electric water pump (7) is at the bottom of the water pump, and the water outlet is directed to spray water toward the side of the floating bridge unit facing the water body.

6. A floating object removal device for a nuclear power plant according to claim 5, characterized in that: The water outlet nozzle of the electric water pump (7) can adjust the water spraying direction, and the adjustment angle of the water outlet nozzle is ±60°.

7. A floating object removal device for a nuclear power plant according to claim 6, characterized in that: The floating bridge unit can be equipped with a plurality of the electric rotary impellers (6) and the electric water pump (7).

8. A method for removing floating objects from a nuclear power plant according to claims 1-7, characterized in that: The method comprises: The tide gauge (10) on the monitoring tower (8) measures the tide level, determines the direction of tide flow according to the high tide and low tide conditions, and rotates the electric rotary impeller (6) according to the direction of tide flow, so that the electric rotary impeller (6) drives the water body to flow in the opposite direction of the tide flow, thereby keeping floating objects away from the water intake (11); when there are floating objects near the inspection pontoon (12), the electric water pump (7) is started to spray water, thereby keeping the floating objects away from the water intake (11).

9. A method for removing floating objects from a nuclear power plant according to claim 8, characterized in that: In the method, when it is detected that there are floating objects near the floating bridge (12), the electric water pump (7) is started to spray water, thereby moving the floating objects away from the water intake (11), and specifically includes: the camera (9) on the monitoring tower (8) monitors the number of floating objects around the floating bridge (12); when the camera (9) detects that there are floating objects within a range of 3 meters of the floating bridge (12), the electric water pump (7) is started and the water outlet nozzle of the electric water pump (7) is rotated, and the electric water pump (7) sprays water to move the floating objects away from the water intake (11); when the camera (9) detects that there are no floating objects within a range of 3 meters of the floating bridge (12), the electric water pump (7) is stopped.

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