Automatic floating ash adsorption device suitable for spent fuel pool of nuclear power plant

Abstract

The invention belongs to the technical field of radiation protection, and particularly relates to a nuclear power plant spent fuel pool floating ash automatic adsorption device which comprises a collecting and filtering assembly, a telescopic adjusting rod and a foreign matter prevention steel wire rope, and the telescopic adjusting rod and the foreign matter prevention steel wire rope are connected with the collecting and filtering assembly; the collecting and filtering assembly is fixed to a pool guardrail through a foreign matter preventing steel wire rope and floats on the surface of a spent fuel pool, and the position of the device in the pool is adjusted through a telescopic adjusting rod with a safety rope. The device can effectively collect and clean floating ash on the surface of the spent fuel pool, the floating ash on the surface of the spent fuel pool is removed, the water quality and transparency of the spent fuel pool are improved, and the safety of spent fuel storage is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of radiation protection, and in particular relates to an automatic floating ash adsorption device suitable for a spent fuel pool in a nuclear power plant. Background Art

[0002] According to the operating experience of pressurized water reactor nuclear power plants, after a long period of operation, a dense layer of floating ash will form on the surface of the spent fuel pool, reducing the transparency of the pool and affecting the visual inspection of the spent fuel. The accumulation of floating ash also poses a risk to the safe storage of spent fuel. The fixed skimming device of the spent fuel pool can remove the floating ash around it, but the floating ash in other areas of the spent fuel pool and on the surface of the fuel transfer compartment cannot be effectively removed. The use of existing tools such as the net bag for salvaging foreign matter in the power plant cannot effectively remove the surface floating ash. There is an urgent need to develop a floating ash adsorption device for the water surface of the spent fuel pool. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic floating ash adsorption device suitable for spent fuel pools in nuclear power plants. The device can effectively collect and clean floating ash on the surface of the spent fuel pool, remove floating ash on the surface of the spent fuel pool, improve the water quality and transparency of the spent fuel pool, and enhance the safety of spent fuel storage.

[0004] The technical solution for achieving the purpose of the present invention is as follows:

[0005] Disclosed is an automatic floating ash adsorption device suitable for a spent fuel pool in a nuclear power plant. The device comprises a collecting and filtering assembly, a telescopic adjustment rod, and a foreign body protection wire rope. The telescopic adjustment rod and the foreign body protection wire rope are respectively connected to the collecting and filtering assembly. The collecting and filtering assembly is fixed to a pool guardrail via the foreign body protection wire rope and floats on the surface of the spent fuel pool. The position of the device in the pool is adjusted via the telescopic adjustment rod with a safety rope.

[0006] The collection and filtering assembly includes: a float, a box, a water pump, and a filtering assembly. The float is symmetrically connected to both sides of the top of the box, and the water pump is installed at the outlet position at the bottom of the box; the filtering assembly is installed in the box.

[0007] The filter assembly includes: filter cotton and a filter cotton pressing plate. The filter cotton and the filter cotton pressing plate are installed at the bottom inside the filter assembly, and the filter cotton is located under the filter cotton pressing plate.

[0008] The filter assembly further comprises a buckle, through which the filter cotton pressing plate is securely fixed to the bottom of the filter assembly.

[0009] The size of the filter assembly matches the size of the inner side of the box body, and the filter assembly is opened along one side perpendicular to the direction of the float.

[0010] The collection and filtration assembly also includes: a rotating float baffle, which is a hollow cylindrical shape and is arranged above the filter cotton pressure plate in a direction perpendicular to the float and parallel to the float. It is connected to one side of the opening of the filter assembly in the box through a hinge. The two ends of the rotating float baffle are adjacent to the outer side of the float, and the inner side of the rotating float baffle and the outer side of the float form an inner ring rectangular space. The rotating float baffle can rotate and swing freely along the rotation axis.

[0011] The collection and filtration component also includes: an anti-foreign matter net, which is fixedly connected to the bottom of the box body, and completely contains the bottom outlet of the box body and the water pump in the anti-foreign matter net to prevent foreign matter from entering.

[0012] The filter assembly extends horizontally outward along the top side edges on both sides parallel to the direction of the float to form a top flange, and the top flange is overlapped on the top surface of the float. The filter assembly pressure plate is installed on the top flange of the filter assembly and the top surface of the float, and the fastening bolts pass through the filter assembly pressure plate and the top surface of the float. The filter assembly and the float are fixedly connected through the cooperation of the filter assembly pressure plate and the fastening bolts, and are also detachable.

[0013] The filter assembly handle is fixedly connected to the top flange; the filter cotton pressing plate handles are fixedly connected on both sides of the filter cotton pressing plate; and the box handles are symmetrically fixedly connected to the top of the box.

[0014] The box handle is provided with an anti-foreign object wire rope fixing hole, and the anti-foreign object wire rope is connected to the collection and filtering assembly through the anti-foreign object wire rope fixing hole; the box side is provided with a hook, and the telescopic adjustment rod is connected to the collection and filtering assembly through the hook.

[0015] The beneficial technical effects of the present invention are:

[0016] 1. The present invention provides an automatic adsorption device for floating dust in a spent fuel pool of a nuclear power plant. The device can efficiently draw floating dust and surface water together with the surface water into a filter device for filtration. The surface floating dust removal operation of the spent fuel pool can be completed in two hours.

[0017] 2. After the arrangement of the automatic floating ash adsorption device for spent fuel pools in nuclear power plants provided by the present invention is completed, the filtration work can be completed automatically. It is safe and convenient, and does not require operators to do manual work, thus effectively saving labor costs.

[0018] 3. The automatic floating ash adsorption device for spent fuel pools in nuclear power plants provided by the present invention is welded entirely with 304 stainless steel. It has a sturdy structure, is lightweight, compact, and easy to operate. It is suitable for transporting spent fuel in rooms with narrow and long passages.

[0019] 4. The automatic floating ash adsorption device for spent fuel pools in nuclear power plants provided by the present invention adopts an integrated design and a buoyancy redundancy design to ensure that the device always floats on the water surface under various possible working conditions, thereby ensuring safety.

[0020] 5. The automatic floating ash adsorption device for spent fuel pools in nuclear power plants provided by the present invention adopts a foreign matter-proof design and is free of small parts such as small bolts and nuts, thus avoiding the risk of replacement and falling. Furthermore, a foreign matter-proof net is welded to the bottom of the device, completely enclosing the lower structure and providing an additional barrier against foreign matter.

[0021] 6. The present invention provides an automatic floating dust adsorption device for spent fuel pools in nuclear power plants. The device uses a telescopic rod and a wire rope to lift the device, which is easy to maintain. The device only needs to replace the filter element, which is easy to operate.

[0022] 7. The present invention provides a filter cotton core (filter cotton) for use in an automatic adsorption device for floating ash in a spent fuel pool of a nuclear power plant. The precision of the filter cotton core and the close coordination between the filter core and the filter screen (filter cotton pressure plate) ensure the effective retention of floating ash.

[0023] 8. The present invention provides a filter core suitable for the automatic adsorption device of floating ash in spent fuel pools of nuclear power plants. Due to the interception of radioactive impurities, the filter core can be replaced without dismantling the entire device. Only the spare part needs to be replaced with the filter core. The replacement is simple and quick, reducing the radiation hazard to workers.

[0024] 9. The automatic adsorption device for floating dust in spent fuel pools of nuclear power plants provided by the present invention requires replacement of filter cotton after each use. The filter screen assembly is a reusable component and does not need to be replaced, thereby reducing the cost of use.

[0025] 10. The present invention provides a rotating buoy baffle suitable for use in an automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant, which fully utilizes the interaction between buoyancy and gravity to establish dynamic balance.

[0026] 11. The water pump outlet of the automatic floating ash adsorption device for the spent fuel pool of a nuclear power plant provided by the present invention adopts radial horizontal water outlet on all sides, which can effectively reduce the impact of drainage on the device and improve stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the water entry working state of an automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant provided by the present invention;

[0028] Figure 2 This is a left view of the automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant provided by the present invention in water-entering working state;

[0029] Figure 3 This is a front view of an automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant provided by the present invention;

[0030] Figure 4This is a left view of an automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant provided by the present invention;

[0031] Figure 5 This is a schematic structural diagram of a filter assembly in an automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant provided by the present invention;

[0032] Figure 6 This is a schematic diagram of the installation of a filter assembly in an automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant provided by the present invention;

[0033] Figure 7 This is a top view of an automatic floating ash adsorption device suitable for spent fuel pools in nuclear power plants provided by the present invention.

[0034] In the figure: 1-collection filter assembly; 2-telescopic adjustment rod; 3-filter assembly handle; 4-box handle; 5-filter cotton pressure plate; 6-filter cotton pressure plate handle; 7 float; 8-box; 9-foreign body protection net; 10-water pump; 11-water outlet; 12-foreign body protection wire rope fixing hole; 13-fastening bolt; 14-rotating float baffle; 15 rotating shaft; 16-filter assembly; 17-filter assembly pressure plate; 18-filter cotton; 19-clip; 20-foreign body protection wire rope. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] like Figure 1-2 As shown, the present invention provides an automatic floating ash adsorption device for spent fuel pools in nuclear power plants. The device comprises a collection and filtration assembly 1, a telescopic adjustment rod 2, and a foreign body protection wire rope 20. The telescopic adjustment rod 2 and the foreign body protection wire rope 20 are each connected to the collection and filtration assembly 1. The collection and filtration assembly 1 is fixed to the pool guardrail via the foreign body protection wire rope 20 and floats on the spent fuel pool surface. The position of the device within the pool is adjusted using the telescopic adjustment rod 2 with a safety rope.

[0037] like Figure 3-4 As shown, the collection and filtration assembly 1 includes: a float 7, a box body 8, an anti-foreign object net 9, a water pump 10, and a filter assembly 16. The float 7 is symmetrically connected to both sides of the top of the box body 8 by welding. The bottom of the box body 8 is a conical outlet. The water pump 10 is installed at the conical outlet position at the bottom of the box body 8. The water pump 10 is provided with a water outlet 11; the anti-foreign object net 9 is fixed to the bottom of the box body 8 by welding, and the conical outlet at the bottom of the box body 8 and the water pump 10 are all enclosed in the anti-foreign object net 9 to prevent foreign matter from entering; the filter assembly 16 is installed in the box body 8.

[0038] like Figure 5-6As shown, the size of the filter assembly 16 matches the inner size of the box body 8, and the filter assembly 16 is open on one side perpendicular to the direction of the float 7; the filter assembly 16 extends horizontally outward along the top side edges on both sides parallel to the float 7 to form a top flange, and the filter mesh assembly handle 3 is fixedly connected to the top flange, and the top flange overlaps the top surface of the float 7. The filter assembly pressure plate 17 is installed on the top flange of the filter assembly 16 and the top surface of the float 7, and the fastening bolt 13 passes through the filter assembly pressure plate 17 and the top surface of the float 7. The filter assembly 16 and the float 7 are fixedly connected through the cooperation of the filter assembly pressure plate 17 and the fastening bolt 13, and are detachable at the same time.

[0039] like Figure 5 As shown, the filter cotton 18 and the filter cotton pressing plate 5 are installed at the bottom inside the filter assembly 16. The filter cotton 18 is located below the filter cotton pressing plate 5. The filter cotton pressing plate 5 is firmly fixed to the bottom of the filter assembly 16 by the buckle 19. The filter cotton pressing plate 5 is fixedly connected to the filter cotton pressing plate handle 6 on both sides.

[0040] A box handle 4 is symmetrically fixed to the top of the box body 8. The box handle 4 is provided with a foreign body prevention wire rope fixing hole 12. The foreign body prevention wire rope 20 is connected to the collection and filter assembly 1 through the foreign body prevention wire rope fixing hole 12. A hook is provided on the side of the box body 8, and the telescopic adjustment rod 2 is connected to the collection and filter assembly 1 through the hook.

[0041] The rotating buoy baffle 14 is hollow and cylindrical, positioned parallel to and perpendicular to the buoy 7 above the filter cotton pressure plate 5. It is hinged to one side of the opening of the filter assembly 16 in the housing 8. Both ends of the rotating buoy baffle 14 are adjacent to the outer side of the buoy 7, and the inner side of the rotating buoy baffle 14 and the outer side of the buoy 7 form a sealed inner rectangular space. The rotating buoy baffle 14 freely rotates and swings along the rotation axis 15 in response to the internal and external pressure differential and buoyancy.

[0042] The working principle of the automatic floating ash adsorption device for spent fuel pools in nuclear power plants provided by the present invention is as follows:

[0043] Based on the principles of buoyancy and gravity balance, and the principle of water surface tension, the float 7 on the device of the present invention is used to support the buoyancy of the entire device, ensuring that the device can float on the surface of the spent fuel pool under any operating conditions. The rotating float baffle 14 on the device can freely rotate and swing under the action of the internal and external pressure difference and buoyancy. The rotating float baffle 14 rises to its highest position due to buoyancy, forming a sealed inner rectangular water area with the float 7 boxes on both sides, which can prevent the adsorbed dust from returning to the pool. As the water pump starts, the liquid level of the sealed inner rectangular water area drops, and the rotating float baffle 14 is lowered accordingly. When the water level outside the baffle is higher than the liquid level of the inner rectangular water area, the water outside the baffle will flood the upper edge of the rotating float baffle 14 and enter, thereby controlling the amount of water entering. A filter assembly 16 with filter cotton is set in the device, and a built-in water pump 10 under the device establishes circulation by pumping water. During operation, one end of the auxiliary anti-foreign-object steel wire rope 20 is fixed to the spent fuel pool fence, and the other end is connected to the housing 8. The device's specific position within the pool is adjusted using the telescopic adjustment rod 2. When the water pump 10 is activated, the water level within the housing 8 begins to drop. The buoyancy of the rotating buoy baffle 14 decreases, causing it to rotate downward, creating a height difference between the water surface outside the housing 8 and the water surface inside the housing 8. This allows surface water and floating debris to enter the housing 8, causing dust to accumulate within the rectangular inner ring. Floating dust, along with the surface water, is collected and filtered by the filtration device. The floating dust collects on the filter cotton 18 of the filter assembly 16. The filtered water is then discharged back into the spent fuel pool via the water pump 10, completing the cycle. After each operation, the device is pushed to shore using the adjustable telescopic rod and slowly towed out of the water using the steel wire rope. After the water in the buoy housing is emptied, the device is lifted to a safe location on shore, the filter element is cleaned, and the filter cotton is replaced based on the amount of floating dust collected.

[0044] The working process of the automatic floating ash adsorption device for a spent fuel pool in a nuclear power plant provided by the present invention is as follows:

[0045] Before use, the operator lifts the filter cotton pressing plate 5 by the filter cotton pressing plate handle 6, places the filter cotton 18 under the filter cotton pressing plate 5, presses the filter cotton pressing plate 5, and the filter cotton pressing plate 5 fixes the filter cotton 18 under the filter cotton pressing plate 5, and the filter cotton pressing plate 5 and the bottom of the filter assembly 16 are firmly fixed by the buckle 19; fix the collection filter assembly 1 on the pool guardrail through the anti-foreign matter steel wire rope 3, float it on the surface of the spent pool, and adjust the position of the device in the pool through the telescopic adjustment rod 2 with a safety rope. After the liquid level in the filtration unit rises to a stable level, the water pump 10 is activated, and the water level inside the unit begins to drop. The rotating buoy baffle 14 rotates freely around the rotation axis 15. Due to the interaction of buoyancy and pressure, the rotating buoy baffle 14 rises and falls with the liquid level inside the tank, creating a height difference between the water surface outside the tank and the water surface inside the tank. This allows surface water and floating dust to enter the unit for collection and filtration. The floating dust is collected on the filter cotton 18 in the collection assembly. The filtered water is then discharged back into the spent fuel pool through the outlet 11 of the water pump 10, completing the circulation. When the rotating buoy baffle 14 reaches its highest position due to buoyancy, it forms an inner rectangular water area with the buoy boxes on both sides. When cleaning is complete, gently lift the foreign object protection wire rope 3 upward, and the water pump 10 will remove the remaining water from the water tank. The water pump 10 is stopped, and the unit is lifted out. The filter cotton pressing plate 5 is lifted, and the filter cotton 18 is removed and properly placed, followed by a new filter cotton 10.

[0046] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. An automatic adsorption device for floating ash in spent fuel pools of nuclear power plants, characterized in that: The device comprises a collecting and filtering assembly (1), a telescopic adjustment rod (2), and a foreign body prevention steel wire rope (20), wherein the telescopic adjustment rod (2) and the foreign body prevention steel wire rope (20) are respectively connected to the collecting and filtering assembly (1); the collecting and filtering assembly (1) is fixed to a pool guardrail via the foreign body prevention steel wire rope (20) and floats on the surface of the spent water pool; the position of the device in the pool is adjusted via the telescopic adjustment rod (2) with a safety rope.

2. The automatic floating ash adsorption device for spent fuel pools in nuclear power plants according to claim 1 is characterized in that: The collecting and filtering assembly (1) comprises: a float (7), a box (8), a water pump (10), and a filtering assembly (16); the float (7) is symmetrically connected to both sides of the top of the box (8); the water pump (10) is installed at the bottom outlet position of the box (8); and the filtering assembly (16) is installed in the box (8).

3. The automatic floating dust adsorption device for spent fuel pools in nuclear power plants according to claim 2 is characterized in that: The filter assembly (16) comprises: filter cotton (18) and a filter cotton pressing plate (5); the filter cotton (18) and the filter cotton pressing plate (5) are installed at the bottom inside the filter assembly (16); the filter cotton (18) is located below the filter cotton pressing plate (5).

4. The automatic floating dust adsorption device for spent fuel pools in nuclear power plants according to claim 3 is characterized in that: The filter assembly (16) further comprises a buckle (19), which is used to securely fix the filter cotton pressing plate (5) and the bottom of the filter assembly (16).

5. The automatic floating dust adsorption device for spent fuel pools in nuclear power plants according to claim 3 is characterized in that: The size of the filter assembly (16) matches the size of the inner side of the box body (8), and the filter assembly (16) is open along one side perpendicular to the direction of the float (7).

6. The automatic floating dust adsorption device for spent fuel pools in nuclear power plants according to claim 5, characterized in that: The collecting and filtering assembly (1) further comprises: a rotating buoy baffle (14), which is hollow cylindrical and is arranged above the filter cotton pressing plate (5) in a direction perpendicular to the buoy (7) and parallel to the buoy. The rotating buoy baffle (14) is connected to one side of the opening of the filtering assembly (16) in the box body (8) through a hinge. The two ends of the rotating buoy baffle (14) are adjacent to the outer side surface of the buoy (7). The inner side surface of the rotating buoy baffle (14) and the outer side surface of the buoy (7) form an inner rectangular space. The rotating buoy baffle (14) can freely rotate and swing along the rotating axis (15).

7. The automatic floating dust adsorption device for spent fuel pools in nuclear power plants according to claim 2 is characterized in that: The collecting and filtering assembly (1) further comprises: an anti-foreign matter net (9), which is fixedly connected to the bottom of the box (8) and completely encloses the bottom outlet of the box (8) and the water pump (10) within the anti-foreign matter net (9) to prevent foreign matter from entering.

8. The automatic floating dust adsorption device for spent fuel pools in nuclear power plants according to claim 5 is characterized in that: The filter assembly (16) extends horizontally outward along the top side edges on both sides in a direction parallel to the buoy (7) to form a top flange, and the top flange is overlapped on the top surface of the buoy (7). The filter assembly pressure plate (17) is installed on the top flange of the filter assembly (16) and the top surface of the buoy (7). The fastening bolts (13) pass through the filter assembly pressure plate (17) and the top surface of the buoy (7). The filter assembly (16) and the buoy (7) are fixedly connected by the cooperation between the filter assembly pressure plate (17) and the fastening bolts (13), and are detachable at the same time.

9. The automatic floating ash adsorption device for spent fuel pools in nuclear power plants according to claim 8, characterized in that: A filter assembly handle (3) is fixedly connected to the top flange; filter cotton pressing plate handles (6) are fixedly connected to both sides of the filter cotton pressing plate (5); and box handles (4) are symmetrically fixedly connected to the top of the box body (8).

10. The automatic floating dust adsorption device for spent fuel pools in nuclear power plants according to claim 9, characterized in that: The box handle (4) is provided with a foreign body prevention wire rope fixing hole (12), and the foreign body prevention wire rope (20) is connected to the collection and filtering assembly (1) through the foreign body prevention wire rope fixing hole (12); the box (8) side is provided with a hook, and the telescopic adjustment rod (2) is connected to the collection and filtering assembly (1) through the hook.

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