Nuclear power plant cold source filtering on-line cleaning system

Abstract

The utility model relates to a nuclear power plant cold source filtering online cleaning system which comprises multiple sets of trash holding net trash suction assemblies, a vacuum main pipe, a pumping drainage unit and a control system, the trash holding net trash suction assemblies can be connected in parallel and are connected with a water inlet pipe of the pumping drainage unit through the vacuum main pipe, and a water drainage pipe of the pumping drainage unit is connected with solid-liquid separation equipment through a pipeline. The separated seawater is directly discharged into the sea, and solid garbage, sand grains and marine organisms are transferred for further treatment; in the whole pumping and draining process, marine organisms and garbage are not broken, secondary pollution is avoided, key parts are all located above the water surface, no mechanical action part exists underwater, underwater maintenance is not needed, operability is higher, and safety is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power plant filtering, in particular to an online cleaning system for filtering cold sources of nuclear power plants. Background Art

[0002] Nuclear power plants use seawater as cooling circulating water and add nets around the rotary drum filters to isolate marine life. Marine life often gathers in the net bags and can easily enter the isolation area, greatly increasing the probability of blockage in the cooling system and affecting the normal operation of the nuclear power plant. Such an accident has occurred at the Honghe Nuclear Power Plant.

[0003] In order to cope with possible cold source incidents, various nuclear power plants have taken a series of cleaning measures, such as a nuclear power plant circulating water pre-filtration system described in the existing patent application number CN202011307319.0, which includes: a first platform, a baffle, a drive member, a guide net, a second platform, a collecting net, a suction pump and a conduit. The baffle is the first device of in-depth defense, which effectively intercepts large floating objects, and also has a certain interception effect on marine organisms in the middle and upper layers, reducing the garbage and marine organisms entering the guide net. The guide net is placed underwater through the drive member, and the intercepted small floating objects enter the guide net from the through holes on the baffle or the lower end of the partition along the direction of the water flow, and finally flow from the guide net into the collecting net. At this time, starting the suction pump can transport the garbage in the collecting net to the shore. This method uses a cutting sewage pump or a non-clogging sewage pump to regularly pump out the tapered mouth of the net bag, thereby breaking up the dense marine life and discharging it to the coast for filtration and dehydration. Each net bag requires a set of pumps. Not only is the floating row heavy and expensive, but the marine life is cut into fragments. Discharging the filtered seawater directly into the sea will pollute the seawater, which needs to be further purified before it can be discharged. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the utility model is to provide a nuclear power plant cold source filtering online cleaning system which has a simple structural principle and will not cause secondary pollution.

[0005] The technical solution adopted by the utility model is: an online cleaning system for filtering cold sources of nuclear power plants, comprising a dirt-blocking net dirt-sucking assembly, a vacuum main pipe, a pumping unit and a control system, wherein the dirt-blocking net dirt-sucking assembly is connected to a water inlet pipe of the pumping unit through the vacuum main pipe, and a drain pipe of the pumping unit is connected to a solid-liquid separation device through a pipeline, and the separated seawater is directly discharged into the sea, and solid garbage, sand and marine organisms are transported for further treatment.

[0006] Furthermore, the sewage suction assembly of the sewage blocking net includes a sewage blocking net which is laterally arranged at the seawater inlet and has large and small openings. The small opening is arranged downstream of the water flow and connected to the sewage suction pipe. The sewage suction pipe extends to the water surface floating platform, connects to the vacuum diaphragm valve, and the vacuum pressure-stabilizing valve in parallel, and then is connected to the vacuum main pipe; a three-way solenoid valve is provided on the control interface at the top of the vacuum diaphragm valve.

[0007] Furthermore, the pumping unit includes two sets of cam pump groups and a casing. A control system is arranged on the side of the casing. The two sets of cam pump groups are arranged in the casing. The water inlet pipes are connected to the vacuum main pipe in parallel, and a pressure sensor is arranged at the connection.

[0008] Furthermore, the cam pump group includes a motor, a cam pump and a frame. The frame is L-shaped, and the bottom is arranged in the casing through shock absorption. The motor and the cam pump are arranged and fixed on the frame up and down, and are driven by a pulley pair. Two sets of cam pump groups are used, one for backup and the other for use.

[0009] Furthermore, the cam pump is a rotor pump, the inlet of which is provided with a ball valve 1, and the outlet is connected to a buffer tank, a one-way valve 1 and a ball valve 2 in sequence.

[0010] Furthermore, a vacuum pressure storage tank is connected in parallel to the vacuum main pipe through a second one-way valve, the opening direction of the second one-way valve is toward the vacuum main pipe, the vacuum pressure storage tank is hollow, a vacuum power tube is arranged on the top, and the vacuum power tube is connected to the three-way solenoid valve.

[0011] Furthermore, the motor, the pressure sensor, and the three-way solenoid valve are electrically connected to a control system.

[0012] Furthermore, the dirt-blocking net dirt-sucking components can be connected in parallel in multiple sets and connected to the vacuum main pipe.

[0013] Furthermore, the sewage suction pipe is made of PVC or PE, so that when cleaning marine organisms such as barnacles attached to the pipe wall, it can be lifted onto the floating platform for operation or directly replaced. Beneficial Effects

[0014] The utility model discloses an online cleaning system for filtering cold sources of nuclear power plants, which is mainly composed of a sewage interception net and sewage suction components, a vacuum main pipe, a pumping unit and a control system. Marine organisms and garbage are intercepted by the sewage interception net along with seawater, and are successively pumped and discharged to solid-liquid separation equipment by the pumping unit through the sewage suction pipe, the vacuum diaphragm valve and the vacuum main pipe. The separated seawater is directly discharged into the sea, and the solid garbage, sand and marine organisms are transported for further treatment. The whole pumping process does not break the marine organisms and garbage, and does not cause secondary pollution. Moreover, key components such as the vacuum diaphragm valve, the vacuum main pipe and the pumping unit are all above the water surface, which is convenient for maintenance. Only the sewage interception net and the sewage suction pipe are underwater, and there are no mechanical moving components. Even if marine organisms such as barnacles are attached to affect the path, they can be lifted out of the water for cleaning or replacement without going into the water for maintenance, and the operability is stronger and the safety is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0017] Figure 2 This is a schematic diagram of the top view of the structure of an embodiment of the present application.

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the extraction and exhaust unit provided in an embodiment of the present application.

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the extraction unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following is a detailed description of the embodiments of the technical solution of the utility model in combination with specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0021] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0022] like Figure 2 , 3 As shown, an online cleaning system for filtering cold sources in a nuclear power plant comprises a trash net suction assembly 1, a vacuum main pipe 3, a pumping unit 7 and a control system 702. The trash net suction assembly 1 can be connected in parallel in multiple sets and connected to the water inlet pipe 705 of the pumping unit 7 through the vacuum main pipe 3. The drain pipe 703 of the pumping unit 7 is connected to the solid-liquid separation device 8 through a pipeline. The separated seawater is directly discharged into the sea, and the solid garbage, sand and marine organisms are transported for further treatment.

[0023] like Figure 1As shown, the waste-blocking net sewage suction assembly 1 includes a waste-blocking net 101 which is arranged horizontally at the seawater inlet and has large and small openings. The small opening is arranged downstream of the water flow and connected to the sewage suction pipe 102. The sewage suction pipe extends to the water surface floating platform 2, connects the vacuum diaphragm valve 103, connects the vacuum pressure-stabilizing valve 105 in parallel, and then connects to the vacuum main pipe 3. A three-way solenoid valve 104 is arranged on the top control interface of the vacuum diaphragm valve 103. The vacuum pressure storage tank 6 is connected to the vacuum main pipe 3 in parallel through the one-way valve 2 5. The one-way valve 2 opens toward the vacuum main pipe. The vacuum pressure storage tank 6 is hollow, and a vacuum power pipe 4 is arranged on the top, and the vacuum power pipe is connected to the three-way solenoid valve 104.

[0024] like Figure 3 , 4 As shown, the pumping unit 7 includes two sets of cam pump groups and a casing 701, a control system 702 is arranged on the side of the casing, the two sets of cam pump groups are arranged in the casing 701, the water inlet pipe 705 is connected to the vacuum main pipe 3 after being connected in parallel, and a pressure sensor 704 is arranged at the connection; the cam pump group includes a motor 708, a cam pump 712 and a frame 707, the frame is L-shaped, and the bottom is arranged in the casing 701 through a shock absorber 713, the motor 708 and the cam pump 712 are arranged and fixed on the frame 707 up and down, and are driven by a pulley pair 714; the cam pump 712 is a rotor pump, the inlet is provided with a ball valve 1 706, and the outlet is connected to the buffer tank 711, the one-way valve 1 710 and the ball valve 2 709 in sequence.

[0025] In the above technical solution, the motor 708, the pressure sensor 704, the three-way solenoid valve 104 are electrically connected to the control system 702. Through the joint action of the cam pump 712, the pressure sensor 704 and the vacuum pressure stabilizing valve 104, the negative pressure in the vacuum main pipe 3, the vacuum pressure storage tank 6 and the vacuum power pipe 4 can be stabilized within the set range. When the three-way solenoid valve 104 is in the open state, the top control interface of the vacuum diaphragm valve 103 is connected to the vacuum power pipe 4, the vacuum diaphragm valve is opened, the sewage suction pipe 102 is connected to the vacuum main pipe 3, and the solid garbage in the small opening of the sewage interception net 101 is sucked into the vacuum main pipe 3 along with the seawater through the sewage suction pipe 102; when the three-way solenoid valve 104 is in the closed state, the top control interface of the vacuum diaphragm valve 103 is disconnected from the vacuum power pipe 4, the vacuum diaphragm valve is closed, and the sewage suction pipe 102 is disconnected from the vacuum main pipe 3. The vacuum main pipe 3 can be connected to multiple sets of dirt-blocking net dirt-sucking components 1 in any combination, the control system 702 can open the three-way solenoid valve 104 in a timed cycle, and the cam pump group is used in one and is in reserve, with strong applicability and high reliability.

[0026] In the above technical solution, key components such as the vacuum diaphragm valve 103, the three-way solenoid valve 104, the vacuum pressure-stabilizing valve 104, the vacuum main pipe 3 and the pumping unit 7 are all above the water surface, and maintenance is convenient. Only the sewage interception net 101 and the sewage suction pipe 102 are underwater. The materials are PVC or PE, and there are no mechanical moving parts underwater. Even if barnacles and other marine organisms are attached to affect the flow path, they can be lifted out of the water for cleaning or replacement without underwater maintenance. The system maintenance is simple, convenient, low-cost and safe.

Claims

1. A nuclear power plant cold source filtration online cleaning system, comprising a waste trap suction assembly (1), a vacuum main pipe (3), a pumping unit (7) and a control system (702), wherein: The sewage suction assembly (1) of the sewage intercepting net is connected to the water inlet pipe (705) of the pumping unit (7) through the vacuum main pipe (3), and the drainage pipe (703) of the pumping unit (7) is connected to the solid-liquid separation device (8) through the pipeline. The separated seawater is directly discharged into the sea, and the solid garbage, sand and marine organisms are transported for further treatment. The sewage suction assembly (1) of the sewage intercepting net comprises a sewage intercepting net (101) which is arranged horizontally at the seawater inlet and has large and small openings, and the small opening is arranged at the downstream of the water flow and connected to the sewage suction pipe (102). The sewage suction pipe extends to the water surface floating platform (2), is connected to the vacuum diaphragm valve (103), is connected in parallel to the vacuum pressure regulating valve (105), and is then connected to the vacuum main pipe (3); a three-way solenoid valve (104) is provided on the control interface at the top of the vacuum diaphragm valve (103).

2. The nuclear power plant cold source filtration online cleaning system according to claim 1 is characterized by: The pumping unit (7) comprises two sets of cam pump groups and a casing (701). A control system (702) is arranged on the side of the casing. The two sets of cam pump groups are arranged in the casing (701). The water inlet pipe (705) is connected to the vacuum main pipe (3) after being connected in parallel. A pressure sensor (704) is arranged at the connection point.

3. The nuclear power plant cold source filtration online cleaning system according to claim 2 is characterized by: The cam pump assembly comprises a motor (708), a cam pump (712) and a frame (707). The frame is L-shaped, and the bottom is arranged in a casing (701) through a shock absorber (713). The motor (708) and the cam pump (712) are arranged and fixed on the frame (707) from top to bottom, and are driven by a pulley pair (714). Two sets of cam pump assemblies are used, one for backup and the other for use.

4. The nuclear power plant cold source filtration online cleaning system according to claim 3 is characterized by: The cam pump (712) is a rotor pump, the inlet of which is provided with a ball valve 1 (706), and the outlet is connected to a buffer tank (711), a one-way valve 1 (710) and a ball valve 2 (709) in sequence.

5. The nuclear power plant cold source filtration online cleaning system according to claim 2 is characterized by: The vacuum main pipe (3) is connected in parallel to a vacuum pressure storage tank (6) via a second one-way valve (5). The opening direction of the second one-way valve is toward the vacuum main pipe. The vacuum pressure storage tank (6) is hollow and a vacuum power pipe (4) is arranged on the top. The vacuum power pipe is connected to a three-way solenoid valve (104).

6. The nuclear power plant cold source filtration online cleaning system according to claim 3 is characterized by: The motor (708), the pressure sensor (704), the three-way solenoid valve (104) and the control system (702) are electrically connected.

7. The nuclear power plant cold source filtration online cleaning system according to claim 6 is characterized by: The dirt-blocking net dirt-sucking assembly (1) can be connected in multiple sets in parallel and connected to the vacuum main pipe (3).

Images