A filtering device and filtering method for lead-bismuth cooled pool type reactors

Abstract

The application is suitable for the field of nuclear reactor technology and discloses a filtering device and filtering method for a lead-bismuth cooled pool type reactor, which comprises a fixing assembly, a branch pipeline and a filtering assembly; the fixing assembly is arranged on the side of the main channel, and the fixing assembly comprises the branch pipeline in which the filtering assembly is detachably installed; the branch pipeline is connected with the side of the main channel through the fixing assembly to form the branch pipeline, and the filtering assembly is used for filtering and purifying in the branch pipeline without providing filtering power by itself; the filtering device as a whole can be arranged in the pool type reactor to ensure the integrity of the boundary of the reactor body; the filtering assembly has a simple structure and is convenient to install and replace, and can be operated in the reactor for a long time, so that the filtering device has a long service life and the replacement period of the filtering device is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear waste treatment, in particular to a filtering device and filtering method of a lead-bismuth cooled pool type reactor. BACKGROUND

[0002] The reactor with liquid lead-bismuth alloy as coolant has good neutron, thermal hydraulic and safety characteristics, and has become one of the main candidate reactor types of the fourth generation advanced nuclear energy system and accelerator driven subcritical nuclear energy system (ADS). However, during the application process of liquid lead-bismuth alloy as coolant, the structural material will be corroded to generate corrosion impurities in the coolant. These impurity particles will flow with the coolant in the cooling system, which will cause influences such as blocking the pipeline, increasing the pressure drop, reducing the heat transfer coefficient, and even damaging the normal operation of the cooling system, so special attention needs to be paid in actual application.

[0003] At present, the impurity hazard in the lead-bismuth alloy cooling system has been recognized at home and abroad, and various methods for controlling the content of impurities in the coolant have been proposed. The filtering and purifying method is an effective means to remove impurity particles. Although the reactor with water or liquid sodium metal as coolant is also provided with a purification system, a filter is used to purify the coolant, but the physical and chemical properties of liquid lead-bismuth alloy are quite different from those of water and liquid sodium metal, so the types and properties of the impurities generated therein are different from those generated in other coolants. Therefore, the existing purification and filtering system in the reactor cannot be used for filtering and purifying the liquid lead-bismuth alloy coolant. At the same time, the filter applied in the pool type reactor needs to meet the conditions of in-pile arrangement, long-term operation, replacement with the refueling period, etc. At present, there is still lack of a filter with high temperature resistance, lead-bismuth corrosion resistance, long service life, etc., which meets the requirements of small and compact filtering device and filtering method in the reactor. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a filtering device for a lead-bismuth cooled pool type reactor, which aims to solve the problem of lack of a filtering device with high temperature resistance, lead-bismuth corrosion resistance, long service life, etc., which meets the requirements of small and compact filtering device in the reactor.

[0005] The technical solution adopted by the present application to solve the technical problem comprises: a fixed component, a branch pipeline and a filtering component; the fixed component is arranged on the side of the main channel, and the branch pipeline is connected with the side of the main channel through the fixed component; the main channel comprises a first liquid inlet and a first liquid outlet; the branch pipeline comprises a second liquid inlet, and the filtering component comprises a third liquid inlet and a third liquid outlet which are in communication with the second liquid inlet; the second liquid inlet is in communication with the main channel and is arranged close to the position of the first liquid outlet; and the third liquid outlet is arranged close to the position of the first liquid inlet.

[0006] In an embodiment, the filter assembly comprises a filter core and a filter structure, the filter structure comprising an outer cylinder, an inner cylinder and a filter plate, the outer cylinder being at least partially inserted into the branch pipeline; the inner cylinder is arranged in the outer cylinder and is sealingly connected with the end of the outer cylinder, the bottom of the inner cylinder is provided with a lower end opening, the lower end opening is in communication with the filter core outlet, the third liquid inlet is arranged on the filter core, 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, and the coolant flows into the filter core from the second liquid inlet through the third liquid inlet, and then flows out through the third liquid outlet in sequence through the inner cylinder and the filter plate.

[0007] In an embodiment, the filter structure further comprises a sealed containing cavity formed between the outer cylinder and the inner cylinder, located between the filter plate and the end of the inner cylinder and the outer cylinder sealingly connected; the filter assembly further comprises a flow limiting unit and a flow detection unit, the flow detection unit is arranged in the sealed containing cavity, and the flow limiting unit is arranged on the inner cylinder.

[0008] In an embodiment, the branch pipeline is further provided with a positioning ring matched with the end of the outer cylinder.

[0009] In an embodiment, the filter device is further provided with a control module, and the control module is electrically connected with the flow limiting unit and the flow detection unit.

[0010] In an embodiment, the outer cylinder is provided with a first flange near one end of the sealing cover, the outer cylinder is movably connected to the sealing cover through the first flange, and the other end of the outer cylinder is connected with the branch pipeline.

[0011] In an embodiment, the filter core is further provided with an isolation cover, the isolation cover is sleeved on the filter core, the upper part of the isolation cover is provided with a third liquid inlet, and the lower part of the isolation cover is sealed.

[0012] In an embodiment, the filter core is a double-layer structure, the double-layer structure comprises 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.

[0013] The application further discloses a filtering method of the filtering device of the lead-bismuth cooling pool type reactor.

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

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

[0016]

[0016] Step S3, the filter assembly is passed through the sealing cover and arranged in the branch pipe of the fixed assembly;

[0017] Step S4, the main channel works, the coolant enters from the first inlet of the main channel, and is output to the second inlet of the main channel, enters the branch pipe, is filtered by the filter assembly in the branch pipe, and is output through the third outlet, and then enters the main channel through the first inlet.

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

[0019] As the filter element captures more corrosion impurities, the flow of the filter assembly decreases, and the flow detection unit in the filter assembly detects the decrease in flow and feeds back a signal to the control module, and the control module controls the flow limiting unit to slowly increase the flow until the flow of the branch pipe recovers to a specified proportion X% of the main channel flow;

[0020] When the reactor produces a large amount of corrosion impurities due to some conditions, the control module controls the flow limiting unit to increase to more than 50%, and controls the flow of the branch pipe to be more than 10% of the main channel flow;

[0021] When the flow limiting unit is opened and closed to more than 50%, the flow detection unit detects that the branch flow decreases to less than half of the specified proportion X% of the main channel flow, and feeds back a signal to the control module, and the control module issues a filter element replacement alarm.

[0022] The present application has the following beneficial effects: The branch pipe is connected to the side of the main channel through the fixed assembly to form a branch pipe, the filter assembly filters and purifies in the branch pipe, and does not need to provide filtering power by itself; The overall filter device can be arranged in the pool-type reactor, does not need to set an additional interface in the reactor container body, ensures the integrity of the reactor body boundary, has a simple structure, is convenient to install and replace, and fully considers the small and compact characteristics of the pool-type reactor when installing the filter device, reasonably utilizes the reactor internal space, provides sufficient filtering area and pollution space for the filter, enables the filter to operate in the reactor for a long time, and ensures that the filter has a long service life and reduces the replacement period of the filter device. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the present application, the present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0024] Figure 1 is a whole structure diagram of a filtering device of a lead-bismuth cooled pool type reactor in an embodiment of the present application;

[0025] Figure 2 is a branch pipeline structure diagram of a filtering device of a lead-bismuth cooled pool type reactor in an embodiment of the present application;

[0026] Figure 3 is a filtering assembly structure diagram of a filtering device of a lead-bismuth cooled pool type reactor in an embodiment of the present application;

[0027] Figure 4 is a flow chart of a filtering method of a filtering device of a lead-bismuth cooled pool type reactor in an embodiment of the present application;

[0028] Figure 5 is a control flow chart of a flow limiting unit of a filtering method of a filtering device of a lead-bismuth cooled pool type reactor in an embodiment of the present application.

[0029] Reference Signs

[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, filtering assembly; 51, third liquid inlet; 52, filter element; 53, second liquid inlet; 54, opening; 55, inner cylinder body; 56, flow detection unit; 57, flow limiting unit; 58, end of inner cylinder body; 59, third liquid outlet; 510, filtering plate; 512, isolation cover; 513, outer cylinder body; 514, first flange; 515, filter element outlet; 516, inner cylinder body outlet; 517, sealed containing cavity. DETAILED DESCRIPTION

[0031] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical solutions, and do not indicate that the devices or elements indicated must have a particular direction, therefore, it cannot be understood as a limitation on the present application.

[0032] It should also be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there can be one or more intervening elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly include one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Figures 1 to 3A filtering device of a lead-bismuth cooled pool type reactor in an embodiment of the present application is shown, which can be used for impurity filtering of liquid lead-bismuth 11, and can include a fixed assembly, a branch pipeline 40, and a filtering assembly 50; the fixed assembly is arranged at the side of the main channel 31, and the branch pipeline 40 is connected with the side of the main channel 31 through the fixed assembly; the main channel 31 includes a first liquid inlet 33 and a first liquid outlet 32; the branch pipeline 40 includes a second liquid inlet 53, and the filtering assembly 50 includes a third liquid inlet 51 and a third liquid outlet 59 which are in communication with the second liquid inlet 53; the second liquid inlet 53 is in communication with the main channel 31 and is arranged at a position close to the first liquid outlet 32; the third liquid outlet 59 is arranged at a position close to the first liquid inlet 33; the fixed assembly is first arranged in the reactor vessel 10, and then the branch pipeline 40 is connected to the fixed assembly through the sealing cover 20, and the branch pipeline 40 is connected with the side of the main channel through the fixed assembly to form a branch pipeline, and the filtering assembly 50 does not need to provide filtering power itself, the overall filtering device can be arranged in the pool type reactor, and an additional interface does not need to be arranged on the reactor vessel body to ensure the integrity of the reactor body boundary, the filtering assembly 50 has a simple structure and is convenient to install and replace, the installation position of the filtering device fully considers the small and compact characteristics of the pool type reactor, and the space in the reactor is reasonably utilized to provide sufficient filtering area and pollution space for the filter, so that the filter can operate in the reactor for a long time, and the long service life of the filter is ensured, and the replacement cycle of the filtering device is reduced.

[0034] Understandably, the working principle of the filtering device is that the liquid entering the main channel through the first liquid inlet 33 flows towards the first liquid outlet 32, and part of the liquid flows into the branch pipeline 40 through the second liquid inlet 53 due to the flow rate and pressure in the main channel, and then enters the filtering assembly 50 through the third liquid inlet 51, the impurities in the liquid are filtered by the filter element 52, and then the liquid flows out of the third liquid outlet 59 through the inner cylinder body 55, and the liquid flowing out of the third liquid outlet 59 enters 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 main channel 31 is an outlet towards the end away from the sealing cover 20, the branch pipeline 40 is parallel to the main channel 31, the end of the branch pipeline 40 away from the sealing cover 20 is connected with the side wall of the main channel 31, and the number of the second liquid inlets 53 is several, which can be adjusted according to actual needs.

[0036] Figures 1 to 3As shown, the filter assembly 50 can include a filter element 52 and a filter structure including an outer cylinder 513, an inner cylinder 55 and a filter plate 510 in an embodiment, 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 sealingly connected with the end of the outer cylinder 513, the inner cylinder 55 is provided with a lower end opening 54 at the bottom, the lower end opening 54 is in communication with the outlet of the filter element 52, the third liquid inlet 51 is arranged on the filter element 52, and the third liquid outlet 59 is arranged at the upper part of the outer cylinder 513, the filter plate 510 is arranged between the inner cylinder outlet 516 and the third liquid outlet 59, the coolant flows into the filter element 52 through the third liquid inlet 51 from the second liquid inlet 53, and then flows out through the third liquid outlet 59 in sequence through the inner cylinder 55 and the filter plate 510, so that the liquid is filtered multiple times, and the filtering effect is obviously improved.

[0037] Figures 1 to 3 As shown, the filter element 52 can include a double-layer structure in an embodiment, the double-layer structure 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.

[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, and different materials can filter different impurities, which need to be determined according to the actual generated impurity types and sizes.

[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 a large diameter, and the inner layer of stainless steel fiber felt with a small pore size can filter particles with a small diameter.

[0040] It can be understood that the filter element 52 material can also be other materials, such as glass fiber, porous ceramic, etc., and different filter materials can be combined with the stainless steel fiber felt material provided in the embodiment to form a suitable filter material.

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

[0042] Figures 1 to 3It is shown that the filtering structure can include, in an embodiment, a closed containing cavity 517 formed between the outer cylinder 513 and the inner cylinder 55, located between the filtering plate 510 and the end of the inner cylinder 55 and the outer cylinder 513 sealingly connected; the filtering assembly 50 further comprises a flow limiting unit 57 and a flow detection unit 56, the flow detection unit 56 is arranged in the closed containing cavity 517, and the flow limiting unit 57 is arranged on the inner cylinder 55; the flow detection unit 56 detects the flow rate of the liquid in the inner cylinder 55, and the flow limiting unit 57 controls the flow and flow rate of the liquid 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, which can remotely control the flow through the control unit.

[0045] Figures 1 to 3 It is shown that the branch pipeline 40 can include, in an embodiment, a positioning ring 41 arranged in the branch pipeline 40 and matched with the end of the outer cylinder 513; the filtering assembly 50 is inserted into the branch pipeline 40 and fixed at a corresponding depth through the positioning ring 41, so that the position of the filtering assembly 50 is relatively fixed and cannot be removed from the position due to vibration of the filtering assembly 50.

[0046] Figures 1 to 3 It is shown that the filter element 52 can include, in an embodiment, that the filtering device is further provided with a control module, and the control module is electrically connected with the flow limiting unit 57 and the flow detection unit 56.

[0047] Figures 1 to 3 It is shown that the outer cylinder 513 is provided with a first flange 514 at one end close to the sealing cover 20, 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 with the branch pipeline 40. The filtering assembly 50 is fixed on the sealing cover 20 through the first flange 514, and after the first flange 514 is loosened, the filtering assembly 50 can be taken out of the reactor vessel 10 for maintenance and replacement.

[0048] Figures 1 to 3 It is shown that the filter element 52 can include, in an embodiment, that the filter element 52 is further provided with an isolation cover 512, the isolation cover 512 is sleeved on the filter element 52, the upper part of the isolation cover 512 is provided with a third liquid inlet, and the lower part of the isolation cover 512 is sealed; the filter element 52 is arranged in the isolation cover 512, the impurity particles captured by the filter element 52 are limited in the isolation cover 512, and when the filtering assembly 50 is replaced, the impurity particles can be removed out of the reactor together, so that the impurity particles are not left in the reactor.

[0049] Figures 1 to 3As shown, the main channel can include, in an embodiment, the main channel is provided with a liquid pump 30, the liquid pump 30 is arranged in the main channel, the output direction of the liquid pump 30 is directed away from the sealing cover 20, and the liquid pump 30 is used to make the liquid participate in the cooling circulation in the reactor vessel 10.

[0050] Figure 4 As shown, the filtering method of the lead-bismuth cooled pool type reactor in an embodiment of the present application includes the following steps:

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

[0052] Step S2, passing the branch pipe 40 from the sealing cover 20 of the reactor vessel 10 and arranging it on the fixed assembly;

[0053] Step S3, passing the filtering assembly 50 from the sealing cover 20 and arranging it in the branch pipe 40 of the fixed assembly;

[0054] S4: the main channel works, the coolant enters from the first liquid inlet 33 of the main channel 31, and is output to the second liquid inlet 53 of the main channel 31 through the main channel 31, and then enters the branch pipe 40, and is filtered through the filtering assembly 50 in the branch pipe 40, and is output through the third liquid outlet 59, and then enters the main channel 31 through the first liquid inlet 33 again.

[0055] Figure 5 As shown, in an embodiment, during operation, the control module controls the flow limiting unit 57 to reduce the flow, 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 action;

[0056] As the filter element 52 captures more corrosion impurities, the flow of the filtering assembly 50 decreases, and the flow detection unit 56 in the filtering assembly 50 detects the decrease in flow and feeds back a signal to the control module, and the control module controls the flow limiting unit 57 to slowly increase the flow until the flow of the branch pipe 40 recovers to a specified proportion X% of the flow in the main channel 31.

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

[0058] When the flow limiting unit 57 is opened and closed to 50%, and the flow detection unit 56 detects that the branch flow decreases to less than half of the specified proportion X% of the flow in the main channel 31, it feeds back a signal to the control module, and the control module issues an alarm for replacing the filter element 52.

[0059] It can be understood that the X% means that the branch pipe flow is X% of the total flow of the main channel, for example, the flow of the control branch pipe described above is more than 10% of the flow of the main channel 31, and 10% is the X%.

[0060] In one embodiment, the filter assembly 50 can be replaced by stopping the operation of the reactor, disassembling the first flange 514 of the filter assembly and the sealing cover 20, and then taking out the filter assembly from the reactor as a whole, placing a new filter assembly into the fixed assembly through the sealing cover 20, and fixing the first flange 514. The replacement process is quick and efficient.

[0061] It can be understood that the above embodiments only express the preferred embodiments of the present application, which are described in detail and specifically, but cannot be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled persons in the art, the above technical features can be freely combined without departing from the concept of the present application, and several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, any equivalent transformation and modification within the scope of the claims of the present application should belong to the scope of the claims of the present application.

Claims

1. A filtration device for a lead-bismuth cooling pool reactor, the reactor comprising a reactor vessel (10), a sealing cap (20) sealing the reactor vessel (10), and a main channel (31) disposed within the reactor vessel (10), characterized in that, The filtration device includes: a fixed assembly, a branch pipe (40), and a filter assembly (50); The fixing component is disposed on the side of the main channel (31), and the branch pipe (40) is connected to the side of the main channel (31) through the fixing component; The main channel (31) includes a first inlet (33) and a first outlet (32); the branch pipe (40) includes a second inlet (53); and the filter assembly (50) includes a third inlet (51) and a third outlet (59) connected to the second inlet (53). The second liquid inlet (53) is connected to the main channel (31) and is located near the first liquid outlet (32); the third liquid outlet (59) is located near the first liquid inlet (33); The filter assembly (50) includes 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 disposed inside the outer cylinder (513). The inner cylinder (55) and the outer cylinder (513) are sealed at their ends. The bottom of the inner cylinder is provided with a lower opening (54), which is connected to the filter element outlet (515). The third liquid inlet (51) is disposed on the filter element (52). The third liquid outlet (59) is disposed on the upper part of the outer cylinder (513). The filter plate (510) is disposed between the inner cylinder outlet (516) 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 flows through the inner cylinder (55) and the filter plate (510) in sequence and out through the third liquid outlet (59). The filter structure further includes a sealed receiving cavity (517) formed between the outer cylinder (513) and the inner cylinder (55), located between the filter plate (510) and the end of the inner cylinder (55) that is sealed to the outer cylinder (513); The filter assembly (50) further includes a flow limiting unit (57) and a flow detection unit (56), wherein the flow detection unit (56) is disposed in the sealed receiving cavity (517) and the flow limiting unit (57) is disposed on the inner cylinder (55); The filtration device is also equipped with a control module, which is electrically connected to the flow limiting unit (57) and the flow detection unit (56).

2. The filtration device for a lead-bismuth cooling pool reactor according to claim 1, characterized in that, The branch pipe (40) is also provided with a positioning ring (41) that cooperates with the end of the outer cylinder (513).

3. The filtration device for a lead-bismuth cooling pool reactor according to claim 1, characterized in that, include: The outer cylinder (513) is provided with a first flange (514) at one end near the sealing cover (20). The outer cylinder (513) is movably connected to the sealing cover (20) through the first flange (514). The other end of the outer cylinder is connected to the branch pipe (40).

4. The filtration device for a lead-bismuth cooling pool reactor according to claim 1, characterized in that, include: The filter element (52) is also provided with an isolation cover (512), which is sleeved on the outside of the filter element (52). The third liquid inlet (51) is located on the upper part of the isolation cover (512), and the lower part of the isolation cover (512) is sealed.

5. A filtration device for a lead-bismuth cooling pool reactor according to claim 1, characterized in that, include: The filter element (52) has a double-layer structure, which is divided into an inner layer and an outer layer. The inner and outer layers are made of the same filter material or the inner and outer layers are made of different filter materials.

6. A filtration method for a lead-bismuth cooled pool reactor, applied to the filtration device of the lead-bismuth cooled pool reactor according to any one of claims 1 to 5, characterized in that, Includes the following steps: Step S1: Fix the fixing component to the main channel (31) inside the reactor vessel (10); Step S2, the branch pipe (40) passes through the sealing cap (20) of the reactor vessel (10) and is mounted on the fixing assembly; Step S3: Pass the filter assembly through the sealing cover (20) and place it in the branch pipe (40) of the fixing assembly; Step S4: The main channel (31) operates, allowing coolant to enter from the first inlet of the main channel, and then be output through the main channel to the second inlet into the branch pipeline. After being filtered by the filter assembly located in the branch pipeline, the coolant is output through the third outlet and then enters the main channel again through the first inlet.

7. The filtration method for a lead-bismuth cooled pool reactor according to claim 6, characterized in that, Step S3 further includes the following steps: When the reactor is running normally, the control module controls the flow limiting unit (57) to reduce the flow. When the flow detection unit detects that the flow reaches the specified percentage X% of the flow in the main channel (31), the flow detection unit sends a signal to the control module, and the control module controls the flow limiting unit (57) to stop operating. As the filter element (52) captures more corrosive impurities, the flow rate of the filter assembly (50) decreases. The flow detection unit inside the filter assembly (50) detects the decrease in flow rate and feeds the signal back to the control module. The control module controls the flow limiting unit (57) to slowly increase the flow rate until the flow rate of the branch pipe (40) recovers to a specified proportion X% of the flow rate of the main channel (31). When the reactor generates 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 rate of the branch pipeline (40) to reach more than 10% of the flow rate of the main channel (31); When the flow limiting unit (57) is opened to 50%, the flow detection unit detects that the flow rate of the branch pipe (40) drops to less than half of the specified percentage X% of the flow rate of the main channel (31), and sends a feedback signal to the control module, which then issues a filter replacement alarm (52).

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