CN113713485A - Nuclear power plant automatic dredging system and rotary filter screen dredging method - Google Patents
Nuclear power plant automatic dredging system and rotary filter screen dredging method Download PDFInfo
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- CN113713485A CN113713485A CN202110839153.5A CN202110839153A CN113713485A CN 113713485 A CN113713485 A CN 113713485A CN 202110839153 A CN202110839153 A CN 202110839153A CN 113713485 A CN113713485 A CN 113713485A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
Abstract
The invention discloses an automatic dredging system for a nuclear power plant and a dredging method for a rotary filter screen. The automatic dredging system for the nuclear power plant is used for forming a solid-liquid mixture from marine biological garbage at the bottom of the rotary filter screen, and then lifting the solid-liquid mixture to the solid-liquid vibrating screen on the ground by the power provided by the cam pump for solid-liquid separation, so that odorless cleaning of the garbage and separation of sludge and marine biological garbage are realized, and operation risk and labor intensity are reduced; the water-saving device is suitable for installation and use under water-deficient and water-free working conditions and in narrow field space.
Description
Technical Field
The invention relates to the technical field of nuclear power plant dredging, in particular to an automatic dredging system for a nuclear power plant and a dredging method of a rotary filter screen.
Background
The circulating cooling water of the nuclear power unit is taken from seawater, large garbage is intercepted by a trash rack, and then the large garbage is filtered by a filter screen (rotary filter screen). The water inlet mode of the rotary filter screen has two design modes of 'external inlet and internal outlet' and 'internal inlet and external outlet', and the two design modes have advantages and disadvantages respectively. Wherein the rotary filter screen for 'external inlet and internal outlet' is designed as ITFH6XXE60073 by Beaudrey, France, and the bottom is covered by sludge gradually deposited and mixed with a large amount of rainbow and barnacle. During overhaul, cleaning is completed manually, the labor intensity is high, and high-risk operation is realized. Research and development novel automatic desilting system helps reducing operation risk and intensity of labour, improves desilting efficiency.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an automatic dredging system for a nuclear power plant and a dredging method of a rotary filter screen using the dredging system, which are capable of reducing operation risks and labor intensity, aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the automatic dredging system for the nuclear power plant comprises a mixing tank, a cam pump, a silt sinking water storage tank, a solid-liquid vibrating screen, a water return pipe and a water feeding pipe, wherein the mixing tank is arranged at the bottom of a rotary filter screen and used for containing marine biological garbage, the cam pump is arranged at the bottom of the rotary filter screen and connected with an outlet of the mixing tank, the silt sinking water storage tank is arranged on the ground close to the top of the rotary filter screen, the solid-liquid vibrating screen is arranged above the silt sinking water storage tank, the water return pipe is connected between an inlet of the mixing tank and the silt sinking water storage tank, and the water feeding pipe is connected between the cam pump and the solid-liquid vibrating screen;
the water in the silt sinking water storage tank enters the mixing tank through the water return pipe under the action of gravity to form a solid-liquid mixture with the marine biological garbage; the cam pump provides power to convey a solid-liquid mixture to the solid-liquid vibrating screen through the water feeding pipe for solid-liquid separation, and separated mud water returns to the silt settling water storage tank.
Preferably, the inlet and the outlet of the mixing trough are respectively positioned at two opposite sides of the mixing trough; and a knife edge grating is arranged in the mixing groove and close to the outlet.
Preferably, a water pressing plate is arranged in the mixing groove and close to the inlet.
Preferably, the silt settling water storage tank comprises a water storage tank body, at least one settling partition plate and at least one defoaming partition plate, wherein the at least one settling partition plate and the at least one defoaming partition plate are arranged in the water storage tank body;
the sedimentation partition plates and the defoaming partition plates are distributed in the water storage box body at intervals, and a water storage space in the water storage box body is divided into at least one sedimentation partition chamber and at least one defoaming partition chamber.
Preferably, the water storage tank body is further provided with an overflow pipe or an overflow port communicated with the silt settling compartment.
Preferably, the solid-liquid vibrating screen is connected to the water storage box body through a spring support, is located above the sedimentation compartment and communicated with the sedimentation compartment, and muddy water separated by the solid-liquid vibrating screen enters the sedimentation compartment.
Preferably, the top of the silt settling compartment is open or provided with a mesh plate;
the top of the defoaming compartment is sealed by a cover plate or provided with a screen plate.
Preferably, the sedimentation partition plate is vertically connected to the bottom surface of the water storage tank body, and a gap is reserved between the top of the sedimentation partition plate and the top surface of the water storage tank body to form an overflow channel;
the defoaming baffle with the settlement baffle looks interval just is close to the wet return, upright connection be in the top surface of retaining box, the bottom of defoaming baffle with leave the interval between the bottom surface of retaining box, form the rivers passageway.
Preferably, the water return pipe and the water feeding pipe are both made of black rubber pipes.
Preferably, the automatic dredging system for the nuclear power plant further comprises a hydraulic pump station; and the hydraulic pump station is connected with the hydraulic motor of the cam pump through an oil inlet pipe and an oil outlet pipe.
The invention also provides a desilting method of a rotary filter screen, which adopts any one of the automatic desilting systems of the nuclear power plants, and comprises the following steps:
s1, after the seawater at the bottom of the rotary filter screen is pumped out, transferring the marine biological garbage accumulated at the bottom of the rotary filter screen into a mixing tank;
s2, flushing water in the silt settling water storage tank into the mixing tank through a water return pipe, and flushing away the marine biological garbage in the mixing tank to form a solid-liquid mixture;
s3, starting a cam pump, and pumping a solid-liquid mixture into the cam pump and conveying the solid-liquid mixture to a solid-liquid vibrating screen through a water feeding pipe under the self-priming action of an inlet of the cam pump;
s4, carrying out solid-liquid separation on the solid-liquid mixture by the solid-liquid vibrating screen, returning the separated mud water to the silt depositing water storage tank, and discharging the separated solid garbage to the collection tank.
Preferably, in step S4, after the muddy water enters the silt sinking water storage tank, the silt sinking compartment in the silt sinking water storage tank is settled, the silt in the muddy water sinks to the bottom of the silt sinking compartment, and the water on the upper layer of the silt sinking compartment flows to the defoaming compartment from the overflow channel at the upper end of the silt sinking compartment, and enters the water return pipe after being defoamed.
The automatic dredging system for the nuclear power plant is used for forming a solid-liquid mixture from marine biological garbage at the bottom of the rotary filter screen, providing power by the cam pump to lift the solid-liquid mixture to the solid-liquid vibration screen on the ground for solid-liquid separation, so that odorless cleaning of the garbage and separation of sludge and marine organisms are realized, and compared with a traditional manual dredging mode, the automatic dredging system for the nuclear power plant reduces operation risks and labor intensity; the water-saving device is suitable for installation and use under water-deficient and water-free working conditions and in narrow field space.
The automatic dredging system for the nuclear power plant is suitable for dredging operation during overhaul, effectively reduces risks, improves efficiency, saves construction period, improves environment, can be popularized to power plants with the same type of circulating water rotary drum networks, and provides reference for dredging operation under similar working conditions.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of an installation structure of an automated nuclear power plant dredging system according to an embodiment of the present invention;
FIG. 2 is a connection block diagram of an automated nuclear power plant desilting system according to an embodiment of the present invention;
fig. 3 is a schematic view of the internal structure of the silt depositing water tank of fig. 2.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in figures 1 and 2, the automatic dredging system for the nuclear power plant comprises a mixing tank 10, a cam pump 20, a silt settling water storage tank 30, a solid-liquid vibrating screen 40, a water return pipe 50 and a water feeding pipe 60. The solid-liquid vibrating screen 40 is arranged above the silt depositing water storage tank 30 and is connected with the silt depositing water storage tank 30 in a liquid guiding way; the water return pipe 50 is connected between the silt deposit water storage tank 30 and the inlet of the mixing tank 10, the cam pump 20 is connected to the outlet of the mixing tank 10, and the water supply pipe 60 is connected between the cam pump 20 and the solid-liquid vibrating screen 40, so that the mixing tank 10, the cam pump 20, the water supply pipe 60, the solid-liquid vibrating screen 40, the silt deposit water storage tank 30 and the water return pipe 50 form a desilting circulation loop.
The automated nuclear power plant desilting system of the present invention is used to desilt a rotating screen (also known as a drum screen) 100. Wherein, the mixing groove 10 and the cam pump 20 are arranged at the bottom (elevation-15 m) of the rotary filter screen 100, and the silt settling water storage tank 30 and the solid-liquid vibration screen 40 are arranged on the ground (ground 0m) close to the top of the rotary filter screen 100. The mixing tank 10 is used for loading marine biological garbage (including marine organisms such as rainbow and barnacle, sludge, sundries and the like) accumulated at the bottom of the rotary filter screen 100, and water in the silt settling water storage tank 30 enters the mixing tank 10 through the water return pipe 50 under the action of gravity to form a solid-liquid mixture with the marine biological garbage; the solid-liquid mixture is conveyed to the solid-liquid vibrating screen 40 by the power provided by the cam pump 20 through the water feeding pipe 60 for solid-liquid separation, the separated mud water returns to the silt depositing and storing water tank 30, and the separated solid garbage can be discharged into the collecting tank.
Specifically, the top of the mixing tank 10 is open, so that the marine biological garbage accumulated at the bottom of the rotary filter screen 100 can be conveniently transferred into the mixing tank 10 manually or by other means. The inlet and outlet of the mixing bowl 10 are preferably located on opposite sides thereof such that externally supplied water enters the mixing bowl 10 from the inlet to disperse the marine waste therein to form a solid-liquid mixture having a solids content (up to 10%) meeting pumping requirements and is then discharged from the outlet on the opposite side.
Because the mixing tank 10 is positioned below the silt sinking water storage tank 30 in the vertical height, the stored water is conveyed into the mixing tank 10 through the water return pipe 50, and the water generates water flow energy (passive) by utilizing gravity in the downward conveying process to disperse the marine biological garbage and can be fully mixed with the marine biological garbage to form a solid-liquid mixture.
When the solid-liquid mixture is output, in order to prevent the aggregation of large garbage in the solid-liquid mixture, a knife-edge grating is arranged in the mixing groove 10 and close to the outlet, and the knife-edge grating further breaks up the solid-liquid mixture.
In addition, a water pressing plate can be arranged in the mixing groove 10 close to the inlet, so that water rushing into the mixing groove 10 is pressed to a certain extent, resistance is reduced, and the mixing degree of the water and the marine biological garbage is improved.
The cam pump 20 is arranged at one side of the outlet of the mixing trough 10, and the inlet end of the cam pump 20 can be connected with the outlet of the mixing trough 10 through a black rubber pipe. After the cam pump 20 is started, the solid-liquid mixture enters the pump body under the self-priming action of the inlet of the cam pump 20, and the forward conveying is completed.
The lobe pump 20 is a rotary displacement pump and also belongs to a non-contact rotor pump. The same two rotors are arranged in the rotor cavity of the cam pump 20, and the two rotors rotate synchronously in the flow channel of the pump shell, and partial vacuum is formed at the inlet end by continuous rotation, so that liquid is sucked into the pump. In the invention, the cam pump 20 is selected as a power pump, the diameter of a single particle in the allowed garbage can reach 60mm, the garbage is friendly to the conglutinated impurities, and the garbage is not easy to wind, jam and block.
The cam pump 20 is adopted as a power source in the invention, and the invention has the following advantages; (1) the cam pump 20 has strong self-absorption capacity (the suction stroke theory can reach 6-8m), can actively absorb media under the condition of no pressure head, and is particularly suitable for garbage with marine organisms mixed with silt and poor fluidity; (2) the rotor of the cam pump 20 is designed into 2-3 convex leaves, the space of the rotor cavity is large, and the rotor cavity is not sensitive to solid and fibrous objects, and is suitable for large-diameter solid substances such as shellfish and barnacles in marine biological garbage and green strip-shaped substances which are wound and grow; (3) the cam pump 20 is a low-shearing force rotor pump, has soft action on fluid media, does not have rigid shearing extrusion, and can cause the solid marine solid garbage to damage the rotor and the rotor cavity less; (4) along with the increase of the fluid viscosity, the internal leakage amount between the rotor and the rotor cavity is reduced, and the device is particularly suitable for conveying high-viscosity fluid and large amount of sludge mixed in marine biological garbage; (5) the solid content is high, fluid with large gas content is allowed to be pumped, cavitation is not easy to occur, the gas-liquid ratio can reach 4:6, and the device is suitable for marine biological waste transmission under the working condition of limited water storage amount; (6) the rotor can be in reverse transmission, so that the short-time reverse conveying of the medium is realized, the possible locked rotor can be effectively eliminated, and the flowability is improved; (7) the hydraulic motor can be matched with a hydraulic motor, and is driven by a hydraulic system in a specific humid environment, so that the electric shock prevention requirement of a humid working condition is met; (8) the pump cavity has high volume utilization coefficient and small overall dimension, and is suitable for the working condition with high requirement on the space dimension.
In addition, the lobe pump 20 has the following advantages: the corrosion resistance is good, and the pump body material can be duplex stainless steel or cast iron; the wear resistance is high, the cam pump generally works between 150 and 400 revolutions per minute, and the movement speed is low; the maintenance is convenient, and the rotor tip or the rotor can be replaced on line; the transmission is stable, and the flow is adjustable.
The rotating speed of the cam pump 20 is more than or equal to 200r/min, preferably 200r/min-250 r/min; the lift of the cam pump 20 is more than or equal to 20 m; the flow rate is more than or equal to 80m3H, may be preferably 85m3H is 140m 3/h. In this embodiment, in order to facilitate the lifting of the lobe pump 20 into and out of the bottom of the rotary strainer 100 and to reduce the space in which the lobe pump 20 is fixed at the bottom, the lobe pump 20 is preferably a lobe pump with a shaft power of 12.6 kw. In actual operation, the rotation speed of the cam pump 20 can be 232r/min, the lift is 29m, and the flow is 100m to improve the efficiency3/h。
The inlet of the mixing trough 10 is connected with the silt sinking water storage tank 30 through a water return pipe 50, and the outlet end of the cam pump 20 is connected with the solid-liquid vibrating screen 40 through a water feeding pipe 60. Wherein, one end of the water return pipe 50 and one end of the water feeding pipe 60 are both arranged at the bottom (elevation-15 m) of the rotary filter screen and are respectively connected with the inlet of the mixing trough 10 and the outlet end of the cam pump 20. The other ends of the water return pipe 50 and the water feeding pipe 60 are positioned on the ground of 0m and are respectively connected with the silt settling water storage tank 30 and the solid-liquid vibrating screen 40. An electric butterfly valve with adjustable opening degree is arranged on the water return pipe 50 to control the water return flow.
The water return pipe 50 and the water supply pipe 60 are used as conveying pipelines, and preferably, black rubber pipes (steel lining black rubber pipes) are adopted. In a preferred embodiment, the black rubber tube of DN100 is preferred, the conveying efficiency is high, and the blockage is not easy to occur. The black rubber pipe is provided with the lining steel ring, so that the tensile force in the axial direction and the radial direction of the pipe can be borne; the bending property is certain, and the installation is convenient; the wear resistance is good, and marine organism particles are not easy to scratch; bear the positive pressure of 8Mpa and the negative pressure, and meet the requirements of working conditions.
On the ground of 0m, the solid-liquid vibration sieve 40 is connected above the silt depositing water storage tank 30 through a spring support, receives the solid-liquid mixture conveyed by the water feeding pipe 60, and performs solid-liquid separation on the solid-liquid mixture in a vibration sieving mode.
Specifically, the solid-liquid vibrating screen 40 receives the solid-liquid mixture from the water feeding pipe 60 through the receiving tank, the solid-liquid mixture falls onto the mesh screen below from the receiving tank, the mesh screen vibrates under the driving of the motor and the eccentric wheel to separate muddy water from the solid garbage, the muddy water permeates into the silt depositing and storing tank 30 downwards, and the solid garbage vibrates along a straight line on the screen surface and is automatically collected into the collecting tank.
The sludge settling water storage tank 30 receives the muddy water separated by the solid-liquid vibrating screen 40, the muddy water is subjected to sedimentation treatment, and the clear water on the upper layer after sedimentation can be sent into the mixing tank 10 through the water return pipe 50 to realize cyclic utilization.
As shown in fig. 3, the settling tank 30 may include a tank body 31, at least one settling baffle 32 and at least one demister baffle 33 disposed within the tank body 31. The settling baffles 32 and the demister baffles 33 are spaced apart within the body 31 to separate a water holding space within the body 31 into at least one settling compartment 301 and at least one demister compartment 302.
Wherein, the sedimentation partition plate 32 is vertically connected to the bottom surface of the water storage tank body 31, and a space is left between the top of the sedimentation partition plate 32 and the top surface of the water storage tank body 31 to form an overflow channel. The settling partition 32 and the inner side face of the water storage tank body 31 opposite to the settling partition 32 form a settling compartment 301, and an overflow channel is communicated with the settling compartment 301 and a defoaming compartment 302. The defoaming partition plate 33 and the settling partition plate 32 are spaced and close to the water return pipe 50, and are vertically connected to the top surface of the water storage tank body 31, and a gap is reserved between the bottom of the defoaming partition plate 33 and the bottom surface of the water storage tank body 31 to form a water flow channel. The space between the defoaming partition plate 33 and the settling partition plate 32 forms a defoaming compartment 302, clear water entering the defoaming compartment 302 through an overflow channel is blocked at the defoaming compartment 302 by the defoaming partition plate 33 when the clear water passes through the water flow channel, and the water after the defoaming is removed enters the water return pipe 50 through the space between the defoaming partition plate 33 and the inner side surface of the water storage tank body 31 opposite to the defoaming partition plate.
Above the silt settling water storage tank 30, the solid-liquid vibrating screen 40 is mainly located above the silt settling compartment 31 and is communicated with the silt settling compartment 301, and mud water separated by the solid-liquid vibrating screen 40 from solid and liquid enters the silt settling compartment 301 downwards. In order to realize the communication between the solid-liquid vibrating screen 40 and the silt sinking compartment 301, the top of the silt sinking compartment 301 is open or provided with a mesh plate, and muddy water directly enters the silt sinking compartment 301 from the open top or enters the silt sinking compartment 301 through the mesh plate.
After the muddy water enters the sedimentation compartment 301, the silt in the muddy water settles to the bottom of the sedimentation compartment 301, and the clear water (relative to the muddy water) at the upper layer flows to the defoaming compartment 302 from the overflow channel at the upper end of the sedimentation compartment 301, is defoamed and then is output from the water return pipe 50.
The top of the defoaming compartment 302 is closed by a cover plate or provided with a mesh plate, so that the defoaming partition plate 33 can be conveniently connected and fixed.
The water storage tank 31 is also provided with an overflow pipe 34 or an overflow port communicated with the silt settling compartment 301. The overflow pipe 34 or the overflow port is located at the upper end of the side surface of the water storage tank body 31 to form a high water level overflow port, so that the liquid level in the water storage tank body 31 is prevented from being too high, and the floating foam on the water surface is timely drained away.
In addition, the water storage tank body 31 is also provided with a water replenishing port and a liquid level switch which are respectively used for replenishing water medium and maintaining the working liquid level in the water storage tank body 31. The water storage tank body 31 may further be provided with a manhole for cleaning the inside sludge of the water storage tank body 31 after the dredging operation is completely completed.
Further, the automatic dredging system for nuclear power plant of the present invention further comprises a hydraulic pump station 70, which is also disposed on the ground (at an elevation of 0m) near the top of the rotary screen 100. The hydraulic pump station 70 is connected to the hydraulic motor of the cam pump 20 through an oil inlet pipe and an oil outlet pipe.
The automatic dredging system of the nuclear power plant is used for dredging the rotary filter screen 100, particularly for the external-in and internal-out type rotary filter screen. Referring to fig. 1, the rotary filter screen 100 is desilted by using the automatic desilting system of the nuclear power plant, and the desilting method can comprise the following steps:
s1, after the seawater at the bottom of the rotary strainer 100 is exhausted, the marine biological waste accumulated at the bottom of the rotary strainer 100 is transferred to the mixing tank 10.
Wherein, the mixing tank 10 and the cam pump 20 are hoisted to the bottom of the rotary filter screen 100 after seawater at the bottom of the rotary filter screen 100 is pumped out. The marine life garbage is transferred into the mixing tank 10 manually or by a robot.
With respect to the manner of manually transferring marine biological waste into the mixing bowl 10, after the manual transfer is completed, the worker can withdraw from the bottom of the rotary strainer 100 without waiting for a long time at the bottom full of offensive odor.
S2, flushing the water in the silt settling water storage tank 30 into the mixing tank 10 through the water return pipe 50, and flushing away the marine life garbage in the mixing tank 10 to form a solid-liquid mixture.
The amount of water flushed into the mixing bowl 10 and the solids content of the solid-liquid mixture formed may depend on the pumping requirements of the lobe pump 20.
S3, starting the cam pump 20, and under the self-priming action of the inlet of the cam pump 20, pumping the solid-liquid mixture into the cam pump 20 and conveying the solid-liquid mixture to the solid-liquid vibrating screen 40 through the water feeding pipe 60.
S4, performing solid-liquid separation on the solid-liquid mixture by the solid-liquid vibrating screen 40, returning the separated mud water to the silt depositing water storage tank 30, and discharging the separated solid garbage to the collection tank.
After muddy water enters the silt settling water storage tank 30, the silt settling compartment 301 in the silt settling water storage tank 30 is settled, silt in the muddy water settles to the bottom of the silt settling compartment 301, water on the upper layer of the silt settling compartment 301 flows to the foam removing compartment 302 from an overflow channel at the upper end of the silt settling compartment 301, and then enters the water return pipe 50 after foam removal, so that cyclic utilization is realized.
In conclusion, the automatic dredging system for the nuclear power plant is used for dredging the rotary filter screen, and can reduce the requirement that 12 persons continuously operate for 3 days in the traditional dredging mode to the requirement that only 6 persons take 1.5 days to finish the dredging; effectively shortens the dredging operation time and avoids the risk of generating toxic gas due to putrefaction when marine organisms are exposed in the air. Because the solid-liquid mixture is separated by the solid-liquid vibrating screen, the quantity of the collected solid garbage can be effectively reduced to 4 buckets from 8 buckets (about 30 cubes) in the prior art, the trouble of sewage is eliminated, the field air quality is improved, and the operation environment is effectively improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. An automatic dredging system of a nuclear power plant is characterized by comprising a mixing tank, a cam pump, a silt sinking water storage tank, a solid-liquid vibrating screen, a water return pipe and a water feeding pipe, wherein the mixing tank is arranged at the bottom of a rotary filter screen and used for containing marine biological garbage, the cam pump is arranged at the bottom of the rotary filter screen and connected with an outlet of the mixing tank, the silt sinking water storage tank is arranged on the ground close to the top of the rotary filter screen, the solid-liquid vibrating screen is arranged above the silt sinking water storage tank, the water return pipe is connected between an inlet of the mixing tank and the silt sinking water storage tank, and the water feeding pipe is connected between the cam pump and the solid-liquid vibrating screen;
the water in the silt sinking water storage tank enters the mixing tank through the water return pipe under the action of gravity to form a solid-liquid mixture with the marine biological garbage; the cam pump provides power to convey a solid-liquid mixture to the solid-liquid vibrating screen through the water feeding pipe for solid-liquid separation, and separated mud water returns to the silt settling water storage tank.
2. The automated nuclear power plant dredging system according to claim 1, wherein the inlet and the outlet of the mixing tank are respectively located at two opposite sides of the mixing tank; and a knife edge grating is arranged in the mixing groove and close to the outlet.
3. The automated nuclear power plant dredging system of claim 2, wherein a water pressing plate is disposed in the mixing tank near the inlet.
4. The automated nuclear power plant dredging system of claim 1, wherein the desilting reservoir comprises a reservoir body, at least one sedimentation partition plate and at least one defoaming partition plate disposed within the reservoir body;
the sedimentation partition plates and the defoaming partition plates are distributed in the water storage box body at intervals, and a water storage space in the water storage box body is divided into at least one sedimentation partition chamber and at least one defoaming partition chamber.
5. The automated nuclear power plant dredging system of claim 4, wherein the storage tank body is further provided with an overflow pipe or an overflow port communicated with the desilting compartment.
6. The automated dredging system of nuclear power plant according to claim 4, wherein the solid-liquid vibrating screen is connected to the water storage tank body through a spring support, is located above the desilting compartment and is communicated with the desilting compartment, and muddy water separated by solid and liquid of the solid-liquid vibrating screen enters the desilting compartment.
7. The automated nuclear power plant dredging system according to claim 6, wherein the top of the desilting compartment is open or provided with a mesh plate;
the top of the defoaming compartment is sealed by a cover plate or provided with a screen plate.
8. The automated nuclear power plant dredging system according to claim 4, wherein the sedimentation partition is vertically connected to the bottom surface of the water storage tank body, and a space is left between the top of the sedimentation partition and the top surface of the water storage tank body to form an overflow channel;
the defoaming baffle with the settlement baffle looks interval just is close to the wet return, upright connection be in the top surface of retaining box, the bottom of defoaming baffle with leave the interval between the bottom surface of retaining box, form the rivers passageway.
9. The automated nuclear power plant dredging system of claim 1, wherein the water return pipe and the water supply pipe are both made of black rubber pipes.
10. The automated nuclear power plant dredging system according to any one of claims 1-9, wherein the automated nuclear power plant dredging system further comprises a hydraulic power unit; and the hydraulic pump station is connected with the hydraulic motor of the cam pump through an oil inlet pipe and an oil outlet pipe.
11. A method for dredging a rotary filter screen, which is characterized in that the automatic dredging system for the nuclear power plant as claimed in any one of claims 1 to 10 is adopted, and the method for dredging the rotary filter screen comprises the following steps:
s1, after the seawater at the bottom of the rotary filter screen is pumped out, transferring the marine biological garbage accumulated at the bottom of the rotary filter screen into a mixing tank;
s2, flushing water in the silt settling water storage tank into the mixing tank through a water return pipe, and flushing away the marine biological garbage in the mixing tank to form a solid-liquid mixture;
s3, starting a cam pump, and pumping a solid-liquid mixture into the cam pump and conveying the solid-liquid mixture to a solid-liquid vibrating screen through a water feeding pipe under the self-priming action of an inlet of the cam pump;
s4, carrying out solid-liquid separation on the solid-liquid mixture by the solid-liquid vibrating screen, returning the separated mud water to the silt depositing water storage tank, and discharging the separated solid garbage to the collection tank.
12. The method of claim 11, wherein in step S4, after the muddy water enters the desilting reservoir, the muddy water is settled in the desilting compartment in the desilting reservoir, the silt in the muddy water settles to the bottom of the desilting compartment, and the water on the upper layer of the desilting compartment flows from the overflow channel at the upper end of the desilting compartment to the defoaming compartment, and after defoaming, the water enters the water return pipe.
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