Filtering device and filtering method for lead-bismuth cooled pool-type reactor

Abstract

The present invention is applicable to the technical field of nuclear reactors, and discloses a filtering device and filtering method for a lead-bismuth cooled pool-type reactor. The filtering device comprises a fixed assembly, a branch pipe, and a filtering assembly; the fixed assembly is arranged on the side surface of a main channel, and the filtering assembly is detachably mounted in the branch pipe; and the branch pipe is connected to the side surface of the main channel by means of the fixed assembly, and the filtering assembly performs filtration and purification in the branch pipe, without requiring the filtering assembly itself to provide filtering power. The filtering device as a whole can be arranged in the pool-type reactor, ensuring the integrity of the reactor body boundary; and the filtering assembly has a simple structure, is convenient to mount and replace, can operate for a long time in the reactor, ensures a long service life of the filtering device, and reduces the replacement cycle of the filtering device.

Description

Filtering device and filtering method for lead-bismuth cooled pool type reactor TECHNICAL FIELD

[0001] The present application relates to the field of nuclear waste treatment, in particular to a filtering device and filtering method for 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 the accelerator driven subcritical nuclear energy system (ADS). However, during the application process of liquid lead-bismuth alloy as coolant, the coolant will be corroded to generate corrosion impurities, and these impurity particles will flow in the cooling system with the coolant, which will cause effects 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 is needed in actual application.

[0003] At present, the harm of impurities 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, among which the filtering purification method is an effective means to remove impurity particles. Although the reactors with water or liquid sodium metal as coolant also have 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, resulting in different types and properties of impurities generated in the two coolants, so the existing purification filter system in the reactor cannot be used for filtering and purifying 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 arrangement, long-term operation, replacement with the refueling period, etc., and currently there is still no filter with the performance of 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 filtering device with the performance of 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 scheme adopted by the present application to solve its technical problems 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 fixed component comprises the branch pipeline in which the filtering component is detachably installed; 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 at a position close to the first liquid outlet; and the third liquid outlet is arranged at a position close to the first liquid inlet.

[0006] In an embodiment, the filtering component comprises a filter core and a filtering structure, the filtering structure comprises an outer cylinder, an inner cylinder and a filter plate, the outer cylinder is 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 which is in communication with the outlet of the filter core, the third liquid inlet is arranged on the filter core, the third liquid outlet is arranged on the upper part of the outer cylinder, and the filter plate is arranged between the outlet of the inner cylinder and the third liquid outlet, so that the coolant flows into the filter core through the third liquid inlet from the second 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 filtering structure further comprises a closed containing cavity which is formed between the outer cylinder and the inner cylinder and is located between the filter plate and the end of the inner cylinder which is sealingly connected with the outer cylinder; the filtering component further comprises 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 an embodiment, the branch pipeline is further provided with a positioning ring which cooperates with the end of the outer cylinder.

[0009] In an embodiment, the filtering device is further provided with a control module which 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 at one end close to 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 which is sleeved on the filter core, the upper part of the isolation cover is provided with the third liquid inlet, and the lower part of the isolation cover is sealed.

[0012] In an 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 different filter materials.

[0013] The application also discloses a filtering method of the filtering device of the lead-bismuth cooled 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] Step S3, passing the filtering assembly through the sealing cover and arranging the filtering assembly in the branch pipeline of the fixing assembly;

[0017] S4: the main channel works, the coolant enters the main channel from the first liquid inlet, is output from the first liquid outlet of the main channel to the second liquid inlet, enters the branch pipeline, is filtered by the filtering assembly in the branch pipeline, is output from the third liquid outlet, and enters the main channel from the first liquid inlet again.

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

[0019] As the filter element captures more corrosion impurities, the flow of the filtering assembly decreases, the flow detection unit in the filtering assembly detects the decrease of the 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 pipeline recovers to the specified proportion X% of the flow of the main channel.

[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 pipeline to be more than 10% of the flow of the main channel.

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

[0022] The present application has the following advantages: the branch pipeline is connected to the side of the main channel through the fixing assembly to form a branch pipeline, and the filtering assembly filters and purifies in the branch pipeline without the filtering assembly itself providing filtering power; the filtering device as a whole can be arranged in the pool-type reactor without the reactor container body being provided with an additional interface to ensure the integrity of the reactor body boundary; the filtering assembly 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 reasonably utilizes the space in the reactor 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 has a long service life, and the replacement cycle of the filtering device is reduced. 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 combination with the 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. Other related drawings can also be obtained by those skilled in the art without creative labor. In the drawings:

[0024] Fig. 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] Fig. 2 is a structure diagram of a branch pipeline of the filtering device of the lead-bismuth cooled pool-type reactor in an embodiment of the present application;

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

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

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

[0029] LIST OF REFERENCE NUMBERS

[0030] 10, reactor container; 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; 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 make the technical features, objectives and effects of the present application clearer, the specific embodiments of the present application will be described in detail below 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, so 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 or interaction relationship of 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 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] Fig. 1 to Fig. 3 show a filtering device of a lead-bismuth cooled pool type reactor in one embodiment of the present application, which can be used for impurity filtering of liquid lead-bismuth 11, and can include a fixed assembly, a branch pipe 40 and a filtering assembly 50; the fixed assembly is arranged on the side of the main channel, and includes the branch pipe 40 in which the filtering assembly 50 is detachably installed; 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 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 near the first liquid outlet 32; the third liquid outlet 59 is arranged near the first liquid inlet 33; the fixed assembly is first arranged in the reactor vessel 10, and then the branch pipe 40 is communicated to the fixed assembly through the sealing cover 20, and the branch pipe 40 is connected with the side of the main channel through the fixed assembly to form a branch pipe, and the filtering assembly 50 does not need to provide filtering power itself, the whole filtering device can be arranged in the pool type reactor, and no additional interface needs 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 period of the filtering device is reduced.

[0034] It can be understood that 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 pipe 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 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 pipe 40 is parallel to the main channel 31, the end of the branch pipe 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] Fig. 1 to Fig. 3 show that the filter assembly 50 in an embodiment can include a filter element 52 and a filter structure, the filter structure including 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 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, a third liquid inlet 51 is arranged on the filter element 52, and a third liquid outlet 59 is arranged at 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 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 turn through the inner cylinder 55 and the filter plate 510, the liquid is filtered by multiple times, and the filtering effect is obviously improved.

[0037] Fig. 1 to Fig. 3 show that the filter element 52 in an embodiment can include a filter element 52 with a double-layer structure, 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 has 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 types and sizes of impurities.

[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 stainless steel fiber felt with a pore size of 40-60 μm, and the inner layer of stainless steel fiber felt is 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 filters relatively large diameter particles first, and the inner layer of stainless steel fiber felt with a small pore size filters relatively small diameter particles.

[0040] It can be understood that the material of the filter element 52 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 structure of the filter element 52 can be cylindrical or corrugated, and each layer of the filter element can have a different structure.

[0042] Fig. 1 to Fig. 3 show 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] Fig. 1 to Fig. 3 show 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] Fig. 1 to Fig. 3 show that the filter core 52 can include, in an embodiment, that the filtering device is further provided with a control module, which is electrically connected with the flow limiting unit 57 and the flow detection unit 56.

[0047] Fig. 1 to Fig. 3 show that the outer cylinder 513 is provided with a first flange 514 near one end of 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 with the branch pipeline 40; the filtering assembly 50 is fixed to 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] Fig. 1 to Fig. 3 show that the filter core 52 can include, in an embodiment, that the filter core 52 is further provided with an isolation cover 512, the isolation cover 512 is sleeved on the filter core 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 core 52 is arranged in the isolation cover 512, and the impurity particles captured by the filter core 52 are limited in the isolation cover 512; when the filtering assembly 50 is replaced, the impurity particles can be removed out of the reactor together, and the situation that the impurity particles are left in the reactor does not occur.

[0049] Fig. 1 to Fig. 3 show that 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] Fig. 4 shows a filtering method of a lead-bismuth cooled pool type reactor in an embodiment of the present application, comprising 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 branch pipe 40 through the first liquid outlet 32 of the main channel 31, and is filtered through the filtering assembly 50 in the branch pipe 40, and is output through the third liquid outlet 59, and enters the main channel 31 again through the first liquid inlet 33.

[0055] Fig. 5 shows that, in an embodiment, the control module controls the flow limiting unit 57 to reduce the flow during operation, when the flow detection unit 56 detects that the flow reaches a specified proportion X% of the flow of 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 of 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 of 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 of 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, when the filter assembly 50 is replaced, the reactor operation needs to be stopped, the filter assembly is disconnected from the first flange 514 of the sealing cover 20, and then the filter assembly is taken out from the reactor as a whole, a new filter assembly is placed into the fixed assembly through the sealing cover 20, and the first flange 514 is installed and fixed. 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 the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled 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 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 filtering device for a lead-bismuth cooled pool type reactor, the reactor comprising a reactor vessel (10), a closure lid (20) sealing the reactor vessel (10) and a primary channel (31) arranged inside the reactor vessel, characterized in that, The filter device comprises a fixed assembly, a branch pipeline (40) and a filter assembly (50); The fixed assembly is arranged on the side of the main channel, and comprises the branch pipeline (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) 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); and the third liquid outlet (59) is arranged at a position close to the first liquid inlet (33).

2. The filtering device of a lead-bismuth cooled pool type reactor according to claim 1, characterized in that, The filter device comprises a fixed assembly, a branch pipeline (40) and a filter assembly (50); The filter assembly (50) comprises a filter core (52) and a filter structure, the filter structure comprising an outer cylinder (513), an inner cylinder (55) and a filter plate (510), the outer cylinder (513) being at least partially inserted into the branch pipeline (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 bottom of the inner cylinder is provided with a lower end opening (54), the lower end opening (54) is in communication with the filter core outlet (515); the third liquid inlet (51) is arranged on the filter core (52); the third liquid outlet (59) is arranged on the upper portion of the outer cylinder (513); the filter plate (510) is arranged between the inner cylinder outlet (516) and the third liquid outlet (59); and the coolant flows into the filter core (52) from the second liquid inlet (53) through the third liquid inlet (51), and then flows out through the third liquid outlet (59) in sequence through the inner cylinder (55) and the filter plate (510).

3. The filtering device of a lead-bismuth cooled pool type reactor according to claim 2, characterized in that, The filter structure further comprises a sealed accommodation cavity (517) formed between the outer cylinder (513) and the inner cylinder (55) and located between the filter plate (510) and the end of the outer cylinder (513) and the inner cylinder (55) which are sealingly connected. The filter assembly (50) further comprises a flow limiting unit (57) and a flow detection unit (56), the flow detection unit (56) being arranged in the sealed accommodation cavity (517), and the flow limiting unit (57) being arranged on the inner cylinder (55).

4. The filtering device of a lead-bismuth cooled pool type reactor according to claim 2, characterized in that, The branch pipeline (40) is further provided with a positioning ring (41) which cooperates with the end of the outer cylinder (513).

5. The filtering device of a lead-bismuth cooled pool type reactor according to claim 3, characterized in that, The filter device further comprises a control module, the control module being electrically connected with the flow limiting unit (57) and the flow detection unit (56). The outer cylinder (513) is provided with a first flange (514) at one end close to the sealing cover (20), the outer cylinder (513) being movably connected to the sealing cover (20) through the first flange (514), and the other end of the outer cylinder being connected with the branch pipeline (40).

6. The filtering device of a lead-bismuth cooled pool type reactor according to claim 2, characterized in 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) being movably connected to the sealing cover (20) through the first flange (514), and the other end of the outer cylinder being connected with the branch pipeline (40). ​ 7. The filtering device of a lead-bismuth cooled pool type reactor according to claim 2, characterized in that, ​ The filter element (52) is also provided with a isolation cover (512) which 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 of a lead-bismuth cooled pool type reactor according to claim 2, characterized in that, Comprise: The filter element (52) is a double-layer structure, which is divided into an inner layer and an outer layer, and the filtering materials of the inner layer and the outer layer are the same or different.

9. A filtering method of a lead-bismuth cooled pool type reactor, applied to the filtering device of any one of claims 1 to 8, characterized in that, Comprise the following steps: Step S1, fixing the fixed assembly on the main channel (31) in the reactor vessel (10); Step S2, passing the branch pipeline (40) from the sealing cover (20) of the reactor vessel (10) and arranging it on the fixed assembly; Step S3, passing the filter assembly from the sealing cover (20) and arranging it in the branch pipeline (40) of the fixed assembly; S4: the main channel (31) works, the coolant enters from the first liquid inlet of the main channel, and is output to the second liquid inlet of the branch pipeline through the first liquid outlet of the main channel, and is filtered through the filter assembly in the branch pipeline, and is output through the third liquid outlet, and enters the main channel through the first liquid inlet again.

10. The filtering method of a lead-bismuth cooled pool type reactor according to claim 9, characterized in that, characterized in that, In the step S3, further comprising the following steps: When the reactor is normally operated, the control module controls the flow limiting unit (57) to reduce the flow, and when the flow detection unit detects that the flow reaches the specified proportion X% of the flow of the main channel (31), the flow detection unit feeds back a signal to the control module, and the control module controls the flow limiting unit (57) to suspend action; As the filter element (52) captures more corrosion impurities, the flow of the filter assembly (50) decreases, and the flow detection unit in the filter 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 pipeline (40) recovers to the specified proportion X% of the flow of the main channel (31); 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 pipeline (40) to be more than 10% of the flow of the main channel (31); When the flow limiting unit (57) is opened and closed to 50%, the flow detection unit detects that the flow of the branch pipeline (40) decreases to less than half of the specified proportion X% of the flow of the main channel (31), and feeds back a signal to the control module, and the control module issues a warning to replace the filter element (52).

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