Filtering device and filtering method of lead bismuth cooling pool type reactor

Abstract

The invention is applicable to the technical field of nuclear reactors, and discloses a filtering device and a filtering method of a lead-bismuth cooling tank type reactor, and the filtering device comprises a fixing assembly, a branch pipeline and a filtering assembly; the fixing assembly is arranged on the side surface of the main channel and comprises a branch pipeline in which the filtering assembly is detachably mounted; the branch pipeline is connected with the side face of the main channel through the fixing assembly to form the branch pipeline, the filtering assembly conducts filtering and purifying in the branch pipeline, and the filtering assembly does not need to provide filtering power. The whole filtering device can be arranged in a pool type reactor to ensure the boundary integrity of a reactor body; the filter assembly is simple in structure and convenient to mount and replace, and can run in the reactor for a long time, so that the filter device is long in service life, and the replacement period of the filter device is shortened.

Description

Technical Field

[0001] The invention relates to the field of nuclear waste treatment, and in particular to a filtering device and a filtering method for a lead-bismuth cooling pool reactor. Background Art

[0002] Reactors using liquid lead-bismuth alloy as coolant have good neutronics, thermal hydraulics and safety characteristics, and have become one of the main candidate reactor types for the fourth-generation advanced nuclear energy system and accelerator-driven subcritical nuclear energy system (ADS). However, when liquid lead-bismuth alloy is used as a coolant, it will corrode structural materials and cause corrosion impurities to be generated in the coolant. These impurity particles will flow in the cooling system with the coolant, causing effects such as blocking pipes, increasing pressure drop, and reducing heat transfer coefficients, and even destroying the normal operation of the cooling system. Therefore, special attention should be paid in practical applications.

[0003] At present, there is a consensus at home and abroad on the hazards of impurities in the lead-bismuth alloy cooling system, and a variety of methods for controlling the impurity content in the coolant have been proposed, among which the filtration purification method is an effective means to remove impurity particles. Although the reactor using water or liquid sodium metal as the coolant is also equipped with a purification system and uses a filter to purify the coolant, the physical and chemical properties of liquid lead-bismuth alloy are quite different from those of water and liquid sodium metal, resulting in the impurities produced therein being different in type and nature from those produced in other coolants. Therefore, it is impossible to use the purification and filtration system in the existing reactor to filter and purify the liquid lead-bismuth alloy coolant. At the same time, the filter used in the pool reactor needs to meet the conditions of in-pile layout, long-term operation, and replacement with the material replacement cycle. At present, there is a lack of high temperature resistance, lead-bismuth corrosion resistance, long life and other properties, and at the same time meet the requirements of small and compact filtering devices and filtering methods in the reactor. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a filtering device for a lead-bismuth cooling pool reactor, aiming to solve the problem in the prior art that there is a lack of a filtering device with the properties of high temperature resistance, lead-bismuth corrosion resistance, long life, etc., while meeting the requirements of a small and compact filtering device inside the reactor.

[0005] The technical solution adopted by the present invention to solve its technical problems includes: a fixing component, a branch pipe and a filtering component; the fixing component is arranged on the side of the main channel, and the fixing component includes a branch pipe for the filtering component to be detachably installed therein; the main channel includes a first liquid inlet and a first liquid outlet; the branch pipe includes a second liquid inlet, and the filtering component includes a third liquid inlet and a third liquid outlet connected to the second liquid inlet; the second liquid inlet is connected to the main channel and is arranged close to the first liquid outlet; the third liquid outlet is arranged close to the first liquid inlet.

[0006] In one embodiment, the filter assembly includes a filter element and a filter structure, the filter structure includes an outer cylinder, an inner cylinder and a filter plate, the outer cylinder is at least partially inserted into the branch pipe; the inner cylinder is arranged in the outer cylinder, and the inner cylinder is sealed and connected to the end of the outer cylinder, the bottom of the inner cylinder is provided with a lower end opening, and the lower end opening is connected to the filter element outlet, the third liquid inlet is arranged on the filter element, the third liquid outlet is arranged on the upper part of the outer cylinder, the filter plate is arranged between the inner cylinder outlet and the third liquid outlet, the coolant flows into the filter element from the second liquid inlet through the third liquid inlet, and then passes through the inner cylinder and the filter plate in turn and flows out through the third liquid outlet.

[0007] In one embodiment, the filtering structure also includes a closed containing cavity formed between the outer cylinder and the inner cylinder, and located between the filter plate and the end of the inner cylinder and the outer cylinder sealed and connected; the filtering assembly also includes a flow limiting unit and a flow detection unit, the flow detection unit is arranged in the closed containing cavity, and the flow limiting unit is arranged on the inner cylinder.

[0008] In one embodiment, a positioning ring is further provided in the branch pipe and matches with the end of the outer cylinder.

[0009] In one embodiment, the filtering device is further provided with a control module, and the control module is electrically connected to the current limiting unit and the flow detection unit.

[0010] In one embodiment, a first flange is provided at one end of the outer cylinder close to the sealing cover, the outer cylinder is movably connected to the sealing cover via the first flange, and the other end of the outer cylinder is connected to the branch pipeline.

[0011] In one embodiment, an isolation cover is further provided at the filter element, and the isolation cover is sleeved on the filter element. A third liquid inlet is provided at the upper portion of the isolation cover, and the lower portion of the isolation cover is sealed.

[0012] In one embodiment, the filter element is a double-layer structure, which is divided into an inner layer and an outer layer, and the inner layer and the outer layer have the same filter material, or the inner layer and the outer layer have different filter materials.

[0013] The present invention also discloses a filtering method for a lead-bismuth cooling pool reactor, comprising the following steps:

[0014] Step S1, fixing the fixing assembly on the main channel in the reactor vessel;

[0015] Step S2, passing the branch pipe through the sealing cover of the reactor vessel and setting it in the main channel of the fixing assembly;

[0016] Step S3, passing the filter assembly through the sealing cover and setting it in the branch pipeline of the fixed assembly;

[0017] S4: The main channel component works, allowing the coolant to enter from the first liquid inlet of the main channel, and output to the second liquid inlet through the first liquid outlet of the main channel to enter the branch pipeline, and after being filtered by the filter component located in the branch pipeline, it is output through the third liquid outlet and enters the main channel again through the first liquid inlet.

[0018] In one embodiment, when the reactor is in normal operation, the control module controls the current limiting unit to reduce the flow rate, and when the flow detection unit detects that the flow rate reaches a specified proportion X% of the flow rate in the main channel, the flow detection unit feeds back a signal to the control module, and the control module controls the current limiting unit to suspend the action;

[0019] As the filter element captures more corrosive impurities, the flow rate of the filter assembly decreases. The flow detection unit in the filter assembly detects the flow drop and feeds back the signal to the control module. The control module controls the flow limiting unit to slowly increase the flow rate until the branch pipeline flow rate returns to the specified proportion X% of the main channel flow rate.

[0020] When the reactor produces a large amount of corrosion impurities due to certain circumstances, the control module controls the current limiting unit to increase to more than 50%, and controls the flow of the branch pipeline to reach more than 10% of the main channel flow;

[0021] When the flow limiting unit is opened and closed to 50%, the flow detection unit detects that the branch flow has dropped below half of the specified proportion X% of the main channel flow, and a feedback signal is sent to the control module, which issues an alarm for replacing the filter element.

[0022] The implementation of the present invention has the following beneficial effects: the branch pipeline is connected to the side of the main channel through a fixed component to form a branch pipeline, and the filter component performs filtering and purification in the branch pipeline, and the filter component itself does not need to provide filtering power; the filter device can be arranged in the pool-type reactor as a whole, and there is no need to set additional interfaces on the reactor container body, thereby ensuring the integrity of the reactor body boundary; the filter component has a simple structure and is easy to install and replace. The installation position of the filter device fully considers the small and compact characteristics of the pool-type reactor, and reasonably utilizes the space in the reactor to provide the filter with sufficient filtering area and pollution-receiving space, so that the filter can operate in the reactor for a long time, thereby ensuring that the filter has a long life and reducing the replacement cycle of the filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 It is an overall structural diagram of a filter device for a lead-bismuth cooling pool reactor in one embodiment of the present invention;

[0025] Figure 2 This is a branch pipeline structure diagram of a filter device for a lead-bismuth cooling pool reactor in one embodiment of the present invention;

[0026] Figure 3 It is a structural diagram of a filter assembly of a filter device for a lead-bismuth cooling pool reactor in one embodiment of the present invention;

[0027] Figure 4 It is a flow chart of a filtering method of a filtering device for a lead-bismuth cooling pool reactor in one embodiment of the present invention;

[0028] Figure 5 The present invention is a flow chart of the control of a current limiting unit of a filtering method for a filtering device of a lead-bismuth cooling pool reactor in an embodiment of the present invention.

[0029] Figure Annotation

[0030] 10. Reactor vessel; 11. Liquid lead bismuth; 20. Sealing cover; 30. Liquid pump; 31. Main channel; 32. First liquid outlet; 33. First liquid inlet; 40. Branch pipeline; 41. Positioning ring; 50. Filter assembly; 51. Third liquid inlet; 52. Filter element; 53. Second liquid inlet; 54. Opening; 55. Inner cylinder; 56. Flow detection unit; 57. Current limiting unit; 59. Third liquid outlet; 510. Filter plate; 512. Isolation cover; 513. Outer cylinder; 514. First flange; 515. Filter element outlet; 516. Inner cylinder outlet; 517. Closed accommodating chamber. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0032] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] Figures 1 to 3A filtering device for a lead-bismuth cooling pool reactor in an embodiment of the present invention is shown. The filtering device for a lead-bismuth cooling pool reactor can be used to filter impurities from liquid lead-bismuth 11, and may include a fixing component, a branch pipe 40 and a filtering component 50; the fixing component is arranged on the side of the main channel, and the fixing component includes a branch pipe 40 for the filtering component 50 to be detachably installed therein; the main channel 31 includes a first liquid inlet 33 and a first liquid outlet 32; the branch pipe 40 includes a second liquid inlet 53, and the filtering component 50 includes a third liquid inlet 51 and a third liquid outlet 59 connected to the second liquid inlet 53; the second liquid inlet 53 is connected to the main channel 31 and is arranged near the first liquid outlet 32; the third liquid outlet 59 is arranged near At the position of the first liquid inlet 33; a fixed component is first set in the reactor container 10, and then the branch pipe 40 passes through the sealing cover 20 to be connected to the fixed component. The branch pipe 40 is connected to the side of the main channel through the fixed component to form a branch pipe. The filter component 50 itself does not need to provide filtering power. The filter device can be arranged in the pool-type reactor as a whole. There is no need to set an additional interface on the reactor container body to ensure the integrity of the reactor body boundary. The filter component 50 has a simple structure and is easy to install and replace. The installation position of the filter device fully considers the small and compact characteristics of the pool-type reactor, and reasonably uses the space in the reactor to provide the filter with sufficient filtering area and pollution space, so that the filter can operate in the reactor for a long time, ensuring that the filter has a long life and reducing the replacement cycle of the filter device.

[0034] It can be understood that the working principle of the filtering device is as follows: the liquid entering the main channel through the first liquid inlet 33 flows through the main channel toward the first liquid outlet 32. When the liquid flows in the main channel, due to the flow rate and pressure, part of the liquid enters the branch pipe 40 through the second liquid inlet 53, and then enters the filter assembly 50 through the third liquid inlet 51. Impurities in the liquid are filtered by the filter element 52, and then the liquid passes through the inner cylinder 55 and comes out from the third liquid outlet 59. The liquid coming out of the third liquid outlet 59 will enter the main channel again from the first liquid inlet 33.

[0035] In a specific embodiment, the main channel 31 is a straight pipe channel, the end of the main channel 31 facing away from the sealing cover 20 is a liquid outlet, the branch pipe 40 is parallel to the main channel 31, and the end of the branch pipe 40 away from the sealing cover 20 is connected to the side wall of the main channel 31. The number of second liquid inlets 53 is several and adjusted according to actual needs.

[0036] Figures 1 to 3As shown, in one embodiment, the filter assembly 50 may include a filter element 52 and a filter structure, the filter structure includes an outer cylinder 513, an inner cylinder 55 and a filter plate 510, the outer cylinder 513 is at least partially inserted into the branch pipe 40; the inner cylinder 55 is arranged in the outer cylinder 513, and the inner cylinder 55 is sealed and connected to the end of the outer cylinder 513, the bottom of the inner cylinder 55 is provided with a lower end opening 54, the lower end opening 54 is connected to the outlet of the filter element 52, the third liquid inlet 51 is arranged on the filter element 52, the third liquid outlet 59 is arranged on the upper part of the outer cylinder 513, the filter plate 510 is arranged between the outlet of the inner cylinder 55 and the third liquid outlet 59, the coolant flows from the second liquid inlet 53 through the third liquid inlet 51 into the filter element 52, and then passes through the inner cylinder 55 and the filter plate 510 in turn and flows out through the third liquid outlet 59, the liquid undergoes multiple filtrations, and the filtering effect is significantly improved.

[0037] Figures 1 to 3 As shown, the filter element 52 in one embodiment may include a double-layer structure of the filter element 52, wherein the double-layer structure is divided into an inner layer and an outer layer, wherein the inner layer and the outer layer have the same filter material, or the inner layer and the outer layer have different filter materials.

[0038] In a specific embodiment, the filter element 52 is a double-layer structure, the outer layer uses single / multi-layer glass fiber, and the inner layer uses single / multi-layer stainless steel fiber felt. The inner and outer layers are combined to form the filter element 52. Different materials can filter different impurities, which needs to be determined based on the type and size of impurities actually generated.

[0039] In a specific embodiment, the filter element 52 is composed of two layers of stainless steel fiber felt, the outer layer of stainless steel fiber felt is a stainless steel fiber felt with a pore size of 40-60 μm, and the inner layer of stainless steel fiber felt is a stainless steel fiber felt with a pore size of 10-40 μm. The outer layer of stainless steel fiber felt with a large pore size first filters particles with larger diameters, and the inner layer of stainless steel fiber felt with a small pore size can filter particles with smaller diameters.

[0040] It is understandable that the filter element 52 may also be made of other materials, such as glass fiber, porous ceramics, etc. At the same time, different filter materials may be combined with the stainless steel fiber felt material provided in this embodiment to form a suitable filter material.

[0041] In a specific embodiment, the filter element 52 may have a cylindrical or corrugated shape, and each layer of the filter element may have a different structure.

[0042] Figures 1 to 3It is shown that the filtering structure in one embodiment may include a closed accommodating chamber 517 formed between the outer cylinder 513 and the inner cylinder 55, and located between the filter plate 510 and the end of the inner cylinder 55 and the outer cylinder 513 that are sealed and connected; the filtering assembly 50 also includes a flow limiting unit 57 and a flow detection unit 56, the flow detection unit 56 is arranged in the closed accommodating chamber 517, the flow limiting unit 57 is arranged on the inner cylinder 55, the flow detection unit 56 detects the liquid flow rate in the inner cylinder 55, and the flow limiting unit 57 controls the liquid flow rate and flow rate in the inner cylinder 55.

[0043] In a specific embodiment, the flow detection unit 56 is an ultrasonic detection sensor, which can detect the flow rate of the liquid without contacting the liquid.

[0044] In a specific embodiment, the flow limiting unit 57 is an electric valve, and the flow rate can be remotely controlled by a control unit.

[0045] Figures 1 to 3 It is shown that in one embodiment, the branch pipe 40 may include a positioning ring 41 that cooperates with the end of the outer cylinder 513. The filter assembly 50 is inserted into the branch pipe 40 and fixed at a corresponding depth by the positioning ring 41, so that the position of the filter assembly 50 is relatively fixed and will not be dislocated due to vibration of the filter assembly 50.

[0046] Figures 1 to 3 As shown, the filter element 52 may include a filtering device and a control module in one embodiment, and the control module is electrically connected to the current limiting unit 57 and the flow detection unit 56.

[0047] Figures 1 to 3 As shown, a first flange 514 is provided at one end of the outer cylinder 513 close to the sealing cover 20, and the outer cylinder 513 is movably connected to the sealing cover 20 through the first flange 514, and the other end of the outer cylinder 513 is connected to the branch pipe 40. The filter assembly 50 is fixed to the sealing cover 20 through the first flange 514, and after the first flange 514 is loosened, the filter assembly 50 can be pulled out of the reactor vessel 10 for maintenance and replacement.

[0048] Figures 1 to 3 As shown, in one embodiment, the filter element 52 may include an isolation cover 512 provided at the filter element 52, the isolation cover 512 is sleeved on the filter element 52, a third liquid inlet is provided on the upper portion of the isolation cover 512, the lower portion of the isolation cover 512 is sealed, and the filter element 52 is disposed inside the isolation cover 512. The impurity particles captured by the filter element 52 will be confined inside the isolation cover 512, and when the filter assembly 50 is replaced, the impurity particles can be removed from the reactor together, and no impurity particles will remain in the reactor.

[0049] Figures 1 to 3As shown, the main channel may include, in one embodiment, a liquid pump 30 is provided in the main channel, the liquid pump 30 is arranged in the main channel, the output direction of the liquid pump 30 is toward a direction away from the sealing cover 20, and the liquid pump 30 is used to allow the liquid to participate in the cooling cycle in the reactor vessel 10.

[0050] Figure 4 A filtering method for a lead-bismuth cooling pool reactor in one embodiment of the present invention is shown, comprising the following steps:

[0051] Step S1, fixing the fixing assembly on the main channel 31 in the reactor vessel 10;

[0052] Step S2, passing the branch pipe 40 through the sealing cover 20 of the reactor vessel 10 and setting it on the fixing assembly;

[0053] Step S3, passing the filter assembly 50 through the sealing cover 20 and setting it in the branch pipe 40 of the fixed assembly;

[0054] S4: The main channel works, and the coolant enters from the first liquid inlet 33 of the main channel 31, and is output to the second liquid inlet 53 through the first liquid outlet 32 ​​of the main channel 31 to enter the branch pipe 40, and after being filtered by the filter component 50 located in the branch pipe 40, it is output through the third liquid outlet 59 and enters the main channel 31 again through the first liquid inlet 33.

[0055] Figure 5 As shown, in one embodiment, it may include that during operation, the control module controls the flow limiting unit 57 to reduce the flow, and when the flow detection unit 56 detects that the flow reaches a specified proportion X% of the flow in the main channel 31, the flow detection unit 56 feeds back a signal to the control module, and the control module controls the flow limiting unit 57 to suspend the action;

[0056] As the filter element 52 captures more corrosive impurities, the flow rate of the filter assembly 50 decreases, and the flow detection unit 56 in the filter assembly 50 detects the decrease in flow rate and feeds back a signal to the control module, which controls the flow limiting unit 57 to slowly increase the flow rate until the flow rate of the branch pipeline 40 is restored to a specified proportion X% of the flow rate of the main channel 31;

[0057] When the reactor produces a large amount of corrosion impurities due to certain circumstances, the control module controls the flow limiting unit 57 to increase to more than 50%, and controls the flow of the branch pipeline 40 to reach more than 10% of the flow of the main channel 31;

[0058] When the flow limiting unit 57 is opened or closed to 50%, the flow detection unit 56 detects that the branch flow has dropped below half of the specified proportion X% of the flow in the main channel 31, and a feedback signal is sent to the control module, which issues an alarm to replace the filter element 52.

[0059] It can be understood that the X% means that the flow of the branch pipeline is X% of the total flow of the main channel. For example, if the flow of the branch pipeline is controlled to reach more than 10% of the flow of the main channel 31, 10% is the X%.

[0060] In one embodiment, when the filter assembly 50 is replaced, the operation of the reactor needs to be stopped, the connection between the filter assembly and the first flange 514 of the sealing cover 20 is disassembled, and then the filter assembly as a whole is lifted out of the reactor, and the new filter assembly is placed into the fixed assembly through the sealing cover 20, and the first flange 514 is installed to fix it. The replacement process is quick and efficient.

[0061] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A filtering device for a lead-bismuth cooling pool reactor, the reactor comprising a reactor vessel (10), a sealing cover (20) for sealing the reactor vessel (10), and a main channel (31) arranged in the reactor body, characterized in that: The filtering device comprises: a fixing component, a branch pipeline (40) and a filtering component (50); The fixing assembly is arranged on the side of the main channel, and the fixing assembly comprises a branch pipe (40) in which the filter assembly (50) is detachably installed; The main channel (31) comprises a first liquid inlet (33) and a first liquid outlet (32); the branch pipeline (40) comprises a second liquid inlet (53); and the filter assembly (50) comprises a third liquid inlet (51) and a third liquid outlet (59) communicated with the second liquid inlet (53); The second liquid inlet (53) is communicated with the main channel (31) and is arranged close to the first liquid outlet (32); the third liquid outlet (59) is arranged close to the first liquid inlet (33).

2. A filter device for a lead-bismuth cooling pool reactor according to claim 1, characterized in that: include: The filter assembly (50) comprises a filter element (52) and a filter structure, wherein the filter structure comprises an outer cylinder (513), an inner cylinder (55) and a filter plate (510), wherein the outer cylinder (513) is at least partially inserted into the branch pipeline (40); The inner cylinder (55) is arranged inside the outer cylinder (513), the inner cylinder (55) is sealedly connected to the end of the outer cylinder (513), a lower end opening (54) is provided at the bottom of the inner cylinder, and the lower end opening (54) is communicated with the filter element outlet (515), the third liquid inlet (51) is arranged on the filter element (52), the third liquid outlet (59) is arranged on the upper part of the outer cylinder (513), and the filter plate (510) is arranged between the inner cylinder outlet (516) and the third liquid outlet (59), and the coolant flows from the second liquid inlet (53) through the third liquid inlet (51) into the filter element (52), and then passes through the inner cylinder (55) and the filter plate (510) in sequence to flow out through the third liquid outlet (59).

3. A filter device for a lead-bismuth cooling pool reactor according to claim 2, characterized in that: The filtering structure further comprises a sealed accommodating chamber (517) formed between the outer cylinder (513) and the inner cylinder (55), and located between the filter plate (510) and an end portion where the inner cylinder (55) and the outer cylinder (513) are sealed and connected; The filter assembly (50) further comprises a flow limiting unit (57) and a flow detection unit (56); the flow detection unit (56) is arranged in the sealed accommodating chamber (517), and the flow limiting unit (57) is arranged on the inner cylinder (55).

4. A filter device for a lead-bismuth cooling pool reactor according to claim 2, characterized in that: A positioning ring (41) is also provided in the branch pipeline (40) and matches the end of the outer cylinder (513).

5. The filtering device for a lead-bismuth cooling pool reactor according to claim 3, characterized in that: include: The filtering device is also provided with a control module, and the control module is electrically connected to the current limiting unit (57) and the flow detection unit (56).

6. A filter device for a lead-bismuth cooling pool reactor according to claim 2, characterized in that: include: A first flange (514) is provided at one end of the outer cylinder (513) close to the sealing cover (20); the outer cylinder (513) is movably connected to the sealing cover (20) via the first flange (514); and the other end of the outer cylinder is connected to the branch pipe (40).

7. The filtering device for a lead-bismuth cooling pool reactor according to claim 2, characterized in that: include: The filter element (52) is also provided with an isolation cover (512), the isolation cover (512) is sleeved outside the filter element (52), the third liquid inlet (59) is arranged on the upper part of the isolation cover (512), and the lower part of the isolation cover (512) is sealed.

8. The filtering device for a lead-bismuth cooling pool reactor according to claim 2, characterized in that: include: The filter element (52) is a double-layer structure, which is divided into an inner layer and an outer layer. The filter materials of the inner layer and the outer layer are the same, or the filter materials of the inner layer and the outer layer are different.

9. A filtration method for a lead-bismuth cooling pool reactor, applied to the filtration device for a lead-bismuth cooling pool reactor according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step S1, fixing the fixing assembly on the main channel (31) in the reactor vessel (10); Step S2, passing the branch pipe (40) through the sealing cover (20) of the reactor vessel (10) and arranging it on the fixing assembly; Step S3, passing the filter assembly through the sealing cover (20) and setting it in the branch pipe (40) of the fixing assembly; S4: The main channel (31) works, allowing the coolant to enter from the first liquid inlet of the main channel, and output to the second liquid inlet through the first liquid outlet of the main channel to enter the branch pipeline, and after being filtered by the filter component located in the branch pipeline, it is output through the third liquid outlet and enters the main channel again through the first liquid inlet.

10. A filtering method for a lead-bismuth cooling pool reactor according to claim 9, characterized in that: In step S3, the following steps are also included: When the reactor is in normal operation, the control module controls the current limiting unit (57) to reduce the flow rate, and when the flow detection unit detects that the flow rate reaches a specified proportion X% of the flow rate in the main channel (31), the flow detection unit feeds back a signal to the control module, and the control module controls the current limiting unit (57) to suspend operation; As the filter element (52) captures more corrosive impurities, the flow rate of the filter assembly (50) decreases, and the flow detection unit in the filter assembly (50) detects the decrease in flow rate and feeds back a signal to the control module, and the control module controls the flow limiting unit (57) to slowly increase the flow rate until the flow rate of the branch pipeline (40) is restored to a specified proportion X% of the flow rate of the main channel (31); When the reactor produces a large amount of corrosion impurities due to certain circumstances, the control module controls the current limiting unit (57) to increase to more than 50%, and controls the flow of the branch pipeline (40) to reach more than 10% of the flow of the main channel (31); When the flow limiting unit (57) is opened or closed to 50%, the flow detection unit detects that the flow of the branch pipeline (40) drops to less than half of the specified proportion X% of the flow of the main channel (31), and a feedback signal is sent to the control module, which issues an alarm for replacing the filter element (52).

Images