A nuclear power plant drum-type filter screen waterweed impurity treatment device

Abstract

The present application belongs to the technical field of nuclear power plant debris treatment, and particularly relates to a nuclear power plant drum-type filter screen aquatic plant debris treatment device, which comprises a crushing wheel, a crusher, a first conveying belt, a conveying motor, a second conveying belt motor and a second conveying belt. The device can automatically cut aquatic plants and other debris on both sides of the drum-type filter screen of the nuclear power plant, and convey the treated aquatic plants and debris into a collecting tank. The device can judge the accumulation degree of the aquatic plants and debris, and realize real-time intervention through the fast and slow cleaning speed of the device. Meanwhile, the device reminds the main control room of the nuclear power plant to take actions such as reducing the unit power, stopping and shutting down to avoid the situation, and ensures the effective export of the residual power of the reactor core.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant debris treatment technology, specifically relating to a device for treating aquatic plants and debris using a drum-type filter screen in nuclear power plants. Background Technology

[0002] For nuclear power plants that use marine water as their final heat sink, floating debris such as aquatic plants at the intake water surface poses a real threat to the cooling source safety of the nuclear power plant units. Debris entering the drum filters of the circulating water and safety water systems, if not promptly removed, will accumulate inside the filters. This blockage can cause high differential pressure alarms in the circulating water and safety water systems, leading to a significant decrease in the heat exchange capacity of the nuclear power plant's cooling source system. This seriously affects the safe and stable operation of the nuclear power plant's equipment and systems, posing a safety hazard. Numerous unplanned power reduction incidents have occurred at nuclear power plants due to the failure to promptly remove floating debris such as aquatic plants from the drum filters.

[0003] To mitigate the impact of weeds and debris on the drum filter screens of nuclear power plants, the plant's cold source contingency plan requires personnel to conduct daily inspections of the weed and debris accumulation at the discharge outlets on both sides of the drum filter screens, promptly removing the weeds and debris by hand. This method is inefficient and poses safety hazards when operating within the rotating drum filter area. Particularly during the flood season when upstream reservoirs release water, large amounts of weeds and debris accumulate. At this time, the only way to remove weeds and debris entering the drum filter screens is to increase personnel for patrols. However, limited by manpower, if the accumulation rate exceeds the capacity for human intervention, it becomes impossible to clear the accumulated weeds in time. This buildup affects the efficiency of the drum filter screens and the cold source system, forcing the nuclear power plant to passively reduce power output, shut down, or even terminate the reactor, potentially threatening the extraction of remaining power from the reactor core. Summary of the Invention

[0004] The purpose of this invention is to provide a device for treating aquatic plants and debris on the drum filter screen of a nuclear power plant. This device can automatically cut aquatic plants and other debris on both sides of the drum filter screen and transfer the treated aquatic plants and debris to a collection tank. It can also judge the degree of accumulation of aquatic plants and debris and intervene in real time by adjusting the speed of the device's cleaning. At the same time, it can remind the nuclear power plant's main control room to take timely avoidance actions such as reducing unit power, shutting down, or stopping the reactor, to ensure the effective extraction of the remaining power of the reactor core. This effectively overcomes the problems of current methods for removing debris from the drum filter screen of nuclear power plants, which cannot intervene in real time, causing the nuclear power plant's main control room to be unable to take timely avoidance actions such as reducing unit power, shutting down, or stopping the reactor, thus threatening the effective extraction of the remaining power of the nuclear power plant's reactor core.

[0005] Technical solution to achieve the purpose of this invention:

[0006] A device for treating aquatic plants and debris on a drum-type filter screen in a nuclear power plant, comprising: a crushing wheel, a crusher, a primary conveyor belt, a conveyor motor, a secondary conveyor motor, and a secondary conveyor belt; the crushing wheel is installed inside the crusher, which receives aquatic plants and debris from the drum-type filter screen, and the crushing wheel crushes the received aquatic plants and debris; the primary conveyor belt is connected to the conveyor motor, which drives the primary conveyor belt for conveying operations; the secondary conveyor belt is connected to the secondary conveyor motor, which drives the secondary conveyor belt for conveying operations; the input side of the primary conveyor belt is installed on the crusher... Directly below the crusher, the input side of the secondary conveyor belt is installed directly below the output side of the primary conveyor belt. The input side of the primary conveyor belt receives the crushed aquatic plants and debris from the crusher and conveys them to the input side of the secondary conveyor belt. The secondary conveyor belt then conveys the crushed aquatic plants and debris from its input side to its output side. The crushed aquatic plants and debris are then dumped from the output side of the secondary conveyor belt into the first collection trough located directly below the output side of the secondary conveyor belt, or they are conveyed from the output side of the secondary conveyor belt to the next-level conveyor belt.

[0007] The device also includes a gravity sensor, which is installed inside the primary conveyor belt and connected to the conveyor motor. The gravity sensor measures the weight of the aquatic plants and debris received on the primary conveyor belt, generates a weight signal, and feeds the weight signal back to the conveyor motor. The conveyor motor receives the weight signal and automatically switches between high and low speeds based on the weight signal.

[0008] The device also includes a secondary conveyor belt lifting motor, which is connected to the secondary conveyor belt and is used to adjust the height of the secondary conveyor belt.

[0009] The device further includes: a three-stage conveyor belt and a three-stage conveyor belt motor. The three-stage conveyor belt is connected to the three-stage conveyor belt motor, and the three-stage conveyor belt is driven by the three-stage conveyor belt motor to carry out the conveying work. The input side of the three-stage conveyor belt is installed directly below the output side of the two-stage conveyor belt, and a second collection trough is provided directly below the output side of the three-stage conveyor belt. The broken aquatic plants and debris are conveyed from the output side of the two-stage conveyor belt to the input side of the three-stage conveyor belt. The three-stage conveyor belt conveys the broken aquatic plants and debris from the input side of the three-stage conveyor belt to the output side of the three-stage conveyor belt. The broken aquatic plants and debris are poured from the output side of the three-stage conveyor belt into the second collection trough located directly below the output side of the three-stage conveyor belt.

[0010] The device also includes a three-stage conveyor belt lifting motor, which is connected to the three-stage conveyor belt and is used to adjust the height of the three-stage conveyor belt.

[0011] The device also includes: several sets of three-stage conveyor belts, three-stage conveyor belt motors, and three-stage conveyor belt lifting motors. Each set of three-stage conveyor belts is connected to a three-stage conveyor belt motor, which drives the three-stage conveyor belts to transport materials. The three-stage conveyor belt lifting motors are connected to the three-stage conveyor belts and are used to adjust the height of the three-stage conveyor belts. The output side of each set of three-stage conveyor belts is installed directly above the input side of the next set of three-stage conveyor belts. A collection trough is located directly below the output side of the last set of three-stage conveyor belts. The broken aquatic plants and debris are conveyed sequentially on each set of three-stage conveyor belts until they reach the last set of three-stage conveyor belts. The output side of the last set of three-stage conveyor belts then dumps the broken aquatic plants and debris into the collection trough.

[0012] The device also includes a monitoring device, which is installed on the crusher and connected to the main control room of the nuclear power plant. The monitoring device acquires real-time video signals of water plants and debris on the drum filter of the nuclear power plant and sends the video signals to the main control room of the nuclear power plant. When the amount of water plants and debris on the drum filter of the nuclear power plant exceeds the warning value, the monitoring device generates an alarm signal and sends the alarm signal to the main control room of the nuclear power plant.

[0013] The transmission motor is connected to the main control room of the nuclear power plant. When the transmission motor is running at high speed, it generates a high-speed alarm signal and sends the high-speed alarm signal to the main control room of the nuclear power plant. When the transmission motor jams, it generates a jamming alarm signal and sends the jamming alarm signal to the main control room of the nuclear power plant.

[0014] The beneficial technical effects of this invention are as follows:

[0015] 1. The present invention provides a device for treating aquatic plants and debris at a drum-type filter screen in a nuclear power plant. By installing a gravity sensor on the primary conveyor belt, the gravity sensor provides real-time feedback of weight signals to the conveyor motor. During the operation of the circulating water and safety water in the nuclear power plant unit, the device can automatically remove aquatic plants and other debris at the drum-type filter screen at high and low speeds based on the amount of debris. This ensures that aquatic plants and other debris at the drum-type filter screen are not sucked into the system by the circulating water pump or the safety water pump or affect the inlet flow of the circulating water pump or the safety water pump. This allows for real-time intervention and greatly saves manpower for personnel who spend long periods of time at the pump room and water intake during typhoons and when upstream reservoirs release floodgates, thus improving work efficiency.

[0016] 2. The present invention provides a device for treating aquatic plants and debris at a drum-type filter screen in a nuclear power plant. By installing a monitoring device, it can monitor the accumulation of aquatic plants and other debris at the drum-type filter screen of the nuclear power plant's circulating water and safety plant water. When the accumulation of aquatic plants and other debris at the drum-type filter screen of the nuclear power plant's circulating water and safety plant water exceeds the warning value, an early warning is issued, reminding the nuclear power plant's main control room to take timely avoidance actions such as reducing unit power, shutting down, and stopping the reactor to ensure the effective extraction of the remaining power of the reactor core. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a drum-type filter device for treating aquatic plants and debris in a nuclear power plant, provided by the present invention.

[0018] In the diagram: 1-crushing wheel; 2-crusher; 3-primary conveyor belt; 4-gravity sensor; 5-conveyor motor; 6-secondary conveyor belt motor; 7-monitoring device; 8-secondary conveyor belt; 9-secondary conveyor belt lifting motor; 10-tertiary conveyor belt lifting motor; 11-tertiary conveyor belt motor; 12-tertiary conveyor belt. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, the present invention provides a device for treating aquatic plants and debris in a drum-type filter screen of a nuclear power plant, comprising: a crushing wheel 1, a crusher 2, a primary conveyor belt 3, a conveyor motor 5, a secondary conveyor belt motor 6, a secondary conveyor belt 8, and a secondary conveyor belt lifting motor 9.

[0021] The crushing wheel 1 is installed inside the crusher 2. The crusher 2 receives aquatic plants and debris from the drum-shaped filter screen. The crushing wheel 1 rotates and crushes the received aquatic plants and debris from the drum-shaped filter screen. The crushed aquatic plants and debris then enter the primary conveyor belt 3 below.

[0022] The primary conveyor belt 3 is connected to the conveyor motor 5, which drives the primary conveyor belt 3 to perform conveying work; the secondary conveyor belt 8 is connected to the secondary conveyor motor 6, which drives the secondary conveyor belt 8 to perform conveying work.

[0023] The input side of the primary conveyor belt 3 is installed directly below the crusher 2, and the input side of the secondary conveyor belt 8 is installed directly below the output side of the primary conveyor belt 3. The input side of the primary conveyor belt 3 receives the water plants and debris crushed by the crusher 2, and conveys the crushed water plants and debris to the input side of the secondary conveyor belt 8 through the conveyor motor 5. The secondary conveyor belt 8 conveys the crushed water plants and debris from the input side of the secondary conveyor belt 8 to the output side of the secondary conveyor belt 8 through the secondary conveyor belt motor 6.

[0024] The secondary conveyor belt lifting motor 9 is connected to the secondary conveyor belt 8, and the height of the secondary conveyor belt 8 is adjusted by the secondary conveyor belt lifting motor 9.

[0025] The broken aquatic plants and debris are poured from the output side of the secondary conveyor belt 8 into the first collection trough located directly below the output side of the secondary conveyor belt 8, completing one collection and cleaning cycle; or the broken aquatic plants and debris are conveyed from the output side of the secondary conveyor belt 8 to the next level conveyor belt.

[0026] In a preferred embodiment, a gravity sensor 4 is installed inside the primary conveyor belt 3. The gravity sensor 4 is connected to the conveyor motor 5. The gravity sensor 4 measures the weight of the aquatic plants and debris received on the primary conveyor belt 3, generates a weight signal, and feeds the weight signal back to the conveyor motor 5. The conveyor motor 5 receives the weight signal and automatically switches between high and low speeds based on the weight signal.

[0027] In a preferred embodiment, the conveyor motor 5 is also connected to the main control room of the nuclear power plant. When the conveyor motor 5 is running at high speed, it generates a high-speed alarm signal and sends it to the main control room of the nuclear power plant to remind the main control personnel to pay attention to the condition of weeds and debris on the drum filter screen. When the conveyor motor 5 jams, it generates a jamming alarm signal and sends it to the main control room of the nuclear power plant to remind the main control personnel that the equipment has malfunctioned.

[0028] In a preferred embodiment, a monitoring device 7 is installed on the crusher 2. The monitoring device 7 has night vision function and is connected to the main control room of the nuclear power plant. The monitoring device 7 acquires the image signal of water plants and debris on the drum filter of the nuclear power plant in real time and sends the image signal to the main control room of the nuclear power plant. When the amount of water plants and debris on the drum filter of the nuclear power plant exceeds the warning value, the monitoring device 7 generates an alarm signal and sends the alarm signal to the main control room of the nuclear power plant.

[0029] In a specific embodiment, the device of the present invention further includes: a three-stage conveyor belt 12, a three-stage conveyor belt motor 11, and a three-stage conveyor belt lifting motor 10. The three-stage conveyor belt 12 is connected to the three-stage conveyor belt motor 11, and the three-stage conveyor belt 12 is driven by the three-stage conveyor belt motor 11 to perform conveying operations. The input side of the three-stage conveyor belt 12 is installed directly below the output side of the two-stage conveyor belt 8, and a second collection trough is provided directly below the output side of the three-stage conveyor belt 12. The broken aquatic plants and debris are conveyed from the output side of the two-stage conveyor belt 8 to the input side of the three-stage conveyor belt 12. The three-stage conveyor belt 12 conveys the broken aquatic plants and debris from the input side of the three-stage conveyor belt 12 to the output side of the three-stage conveyor belt 12. The three-stage conveyor belt lifting motor 10 is connected to the three-stage conveyor belt 12, and the height of the three-stage conveyor belt 12 is adjusted by the three-stage conveyor belt lifting motor 10. The broken aquatic plants and debris are poured from the output side of the three-stage conveyor belt 12 into the second collection trough located directly below the output side of the three-stage conveyor belt 12.

[0030] In a specific implementation, depending on the site environment, multiple conveyor belts can be set up, such as several sets of three-stage conveyor belts 12, three-stage conveyor belt motors 11, and three-stage conveyor belt lifting motors 10. Each set of three-stage conveyor belts 12 is connected to the three-stage conveyor belt motors 11, and the three-stage conveyor belts 12 are driven by the three-stage conveyor belt motors 11 to transport materials. The three-stage conveyor belt lifting motors 10 are connected to the three-stage conveyor belts 12 and are used to adjust the height of the three-stage conveyor belts 12. The output side of each set of three-stage conveyor belts 12 is installed directly above the input side of the next set of three-stage conveyor belts 12. A collection trough is provided directly below the output side of the last set of three-stage conveyor belts 12. The broken aquatic plants and debris are conveyed sequentially on each set of three-stage conveyor belts 12 until they are conveyed to the last set of three-stage conveyor belts 12. The output side of the last set of three-stage conveyor belts 12 then dumps the broken aquatic plants and debris into the collection trough.

[0031] 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, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A device for treating aquatic plants and debris using a drum-type filter screen in a nuclear power plant, characterized in that, The device includes: a crushing wheel (1), a crusher (2), a primary conveyor belt (3), a conveyor motor (5), a secondary conveyor motor (6), and a secondary conveyor belt (8); the crushing wheel (1) is installed inside the crusher (2), which receives aquatic plants and debris from the drum-shaped filter screen, and the crushing wheel (1) crushes the received aquatic plants and debris from the drum-shaped filter screen; the primary conveyor belt (3) is connected to the conveyor motor (5), and the primary conveyor belt (3) is driven by the conveyor motor (5) to perform conveying work; the secondary conveyor belt (8) is connected to the secondary conveyor motor (6), and the secondary conveyor belt (8) is driven by the secondary conveyor motor (6) to perform conveying work; the input side of the primary conveyor belt (3) is installed directly below the crusher (2), and the input side of the secondary conveyor belt (8) is installed directly below the output side of the primary conveyor belt (3); the input side of the primary conveyor belt (3) receives the aquatic plants and debris crushed by the crusher (2). The device further includes: a gravity sensor (4), which is installed in the primary conveyor belt (3) and connected to the conveyor motor (5). The gravity sensor (4) measures the weight of the water plants and debris received on the primary conveyor belt (3), generates a weight signal, and feeds the weight signal back to the conveyor motor (5). The conveyor motor (5) receives the weight signal and automatically switches between high and low speeds according to the weight signal. The device also includes: a monitoring device (7), which is installed on the crusher (2) and connected to the main control room of the nuclear power plant. The monitoring device (7) acquires the image signal of water plants and debris on the drum filter screen of the nuclear power plant in real time and sends the image signal to the main control room of the nuclear power plant. When the amount of water plants and debris on the drum filter screen of the nuclear power plant exceeds the warning value, the monitoring device (7) generates an alarm signal and sends the alarm signal to the main control room of the nuclear power plant. The transmission motor (5) is connected to the main control room of the nuclear power plant. When the transmission motor (5) is running at high speed, the transmission motor (5) generates a high-speed alarm signal and sends the high-speed alarm signal to the main control room of the nuclear power plant. When the transmission motor (5) is stuck, the transmission motor (5) generates a stuck alarm signal and sends the stuck alarm signal to the main control room of the nuclear power plant.

2. The device for treating aquatic plants and debris using a drum-type filter screen in a nuclear power plant according to claim 1, characterized in that, The device also includes a secondary conveyor belt lifting motor (9), which is connected to the secondary conveyor belt (8) and is used to adjust the height of the secondary conveyor belt (8).

3. The device for treating aquatic plants and debris using a drum-type filter screen in a nuclear power plant according to claim 1, characterized in that, The device also includes: a three-stage conveyor belt (12) and a three-stage conveyor belt motor (11). The three-stage conveyor belt (12) is connected to the three-stage conveyor belt motor (11), and the three-stage conveyor belt (12) is driven by the three-stage conveyor belt motor (11) to carry out the conveying work. The input side of the three-stage conveyor belt (12) is installed directly below the output side of the two-stage conveyor belt (8), and a second collection trough is provided directly below the output side of the three-stage conveyor belt (12). The broken aquatic plants and debris are conveyed from the output side of the two-stage conveyor belt (8) to the input side of the three-stage conveyor belt (12). The three-stage conveyor belt (12) conveys the broken aquatic plants and debris from the input side of the three-stage conveyor belt (12) to the output side of the three-stage conveyor belt (12). The broken aquatic plants and debris are poured from the output side of the three-stage conveyor belt (12) into the second collection trough located directly below the output side of the three-stage conveyor belt (12).

4. The device for treating aquatic plants and debris using a drum-type filter screen in a nuclear power plant according to claim 3, characterized in that, The device also includes a three-stage conveyor belt lifting motor (10), which is connected to the three-stage conveyor belt (12) and is used to adjust the height of the three-stage conveyor belt (12).

5. A device for treating aquatic plants and debris using a drum-type filter screen in a nuclear power plant according to claim 4, characterized in that, The device also includes: several sets of three-stage conveyor belts (12), three-stage conveyor belt motors (11), and three-stage conveyor belt lifting motors (10). Each set of three-stage conveyor belts (12) is connected to the three-stage conveyor belt motors (11) and drives the three-stage conveyor belts (12) to carry out the work. The three-stage conveyor belt lifting motors (10) are connected to the three-stage conveyor belts (12) and are used to adjust the height of the three-stage conveyor belts (12). The output side of each set of three-stage conveyor belts (12) is installed directly above the input side of the next set of three-stage conveyor belts (12). A collection trough is provided directly below the output side of the last set of three-stage conveyor belts (12). The broken aquatic plants and debris are conveyed sequentially on each set of three-stage conveyor belts (12) until they are conveyed to the last set of three-stage conveyor belts (12). The broken aquatic plants and debris are poured into the collection trough by the output side of the last set of three-stage conveyor belts (12).

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