Lead-bismuth fast reactor coolant covering gas system

Abstract

The utility model discloses a lead-bismuth fast reactor coolant covering gas system which comprises a monitoring module and a purifying module, the monitoring module comprises a monitoring pipeline, and the monitoring pipeline is provided with a radiation monitoring device and an online instrument. The purification module comprises a purification pipeline which is connected with the monitoring pipeline in parallel, and a first control valve and a second control valve are arranged at the two ends of the purification pipeline correspondingly. A filtering device, a cooling device, a hydrogen eliminating device and a fan are arranged on the purification pipeline; and the filtering device and the cooling device are arranged close to one side of the first control valve. The lead-bismuth fast reactor coolant covering gas system comprises a monitoring module and a purification module, in the normal operation stage of a unit, the monitoring module can monitor the radioactive content of covering gas in real time and judge nuclide components, meanwhile, the impurity content of the covering gas can be monitored in real time, and quality control can be conducted on the covering gas through the purification module; and the repeated utilization rate of the covering gas is improved through a circulating purification mode, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a lead-bismuth fast reactor coolant covering gas system. Background Technique

[0002] Pool-type metal reactors generally need to use inert gas to cover the primary coolant, and a system needs to be set up for the covering gas to ensure basic functions such as the quality of the covering gas.

[0003] When considering quality monitoring, most general metal reactor covering gas systems adopt relatively simple purging and replacement principles to recover the old gas and supplement the new gas. Taking the patent CN200720177975.7 as an example, its system mainly purges the primary loop covering gas into the buffer tank through purging, and then collects the waste gas into the decay tank through a compressor for decay, so as to be reused later. There are mainly two disadvantages. First, the system function is relatively single, and the purging and replacement operation must be carried out under the shutdown state. Second, auxiliary equipment such as decay tanks for recovering the old gas needs to be set up, and the filling volume of the covering gas is large, resulting in high costs. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a lead-bismuth fast reactor coolant covering gas system.

[0005] The technical solution adopted by the utility model to solve its technical problem is to construct a lead-bismuth fast reactor coolant covering gas system, including a monitoring module and a purification module;

[0006] The monitoring module includes a monitoring pipeline, both ends of the monitoring pipeline are respectively connected to the gas outlet end and the gas return end of the lead-bismuth fast reactor, and a radiation monitoring device and an on-line instrument are arranged on the monitoring pipeline;

[0007] The purification module includes a purification pipeline, the purification pipeline is connected in parallel with the monitoring pipeline, first control valves and second control valves are respectively arranged at both ends of the purification pipeline, the first control valve is arranged close to the gas outlet end, and the second control valve is arranged close to the gas return end; a filtering device, a cooling device, a hydrogen elimination device and a fan are arranged on a section of the purification pipeline between the first control valve and the second control valve, and the filtering device and the cooling device are arranged on the side close to the first control valve.

[0008] In some embodiments, the lead-bismuth fast reactor coolant covering gas system further includes a pressure control module;

[0009] The pressure control module includes a pressure control pipeline. One end of the pressure control pipeline is connected upstream of the fan, and the other end is connected downstream of the second control valve. A buffer tank is provided on the pressure control pipeline, and a reflux isolation valve is provided between the buffer tank and the upstream of the fan. The buffer tank is connected with an intake pipeline and an exhaust pipeline. An intake control valve is provided on the intake pipeline, and an exhaust control valve is provided on the exhaust pipeline.

[0010] In some embodiments, a sampling pipeline is further provided on the monitoring pipeline, and a sampling isolation valve is provided on the sampling pipeline; a sampling interface is provided on the sampling pipeline.

[0011] In some embodiments, a heating device is provided on one side of the monitoring pipeline close to the gas return end.

[0012] In some embodiments, a check valve is provided on a section between the connection of the monitoring pipeline and the purification pipeline.

[0013] In some embodiments, the on-line instrument includes a dew point meter.

[0014] In some embodiments, the on-line instrument includes a hydrogen meter.

[0015] In some embodiments, the on-line instrument includes an oxygen meter.

[0016] In some embodiments, a first valve and a second valve are respectively provided at the upstream and downstream ends of the hydrogen elimination device;

[0017] The purification module further includes a first branch pipeline;

[0018] The first branch pipeline is respectively connected in parallel upstream of the first valve and downstream of the second valve. A humidifying device is provided on the first branch pipeline, and a third valve and a fourth valve are respectively provided at the upstream and downstream ends of the humidifying device.

[0019] In some embodiments, the purification module further includes a second branch pipeline;

[0020] The second branch pipeline is respectively connected in parallel upstream of the first valve and downstream of the second valve;

[0021] A fifth valve is provided on the second branch pipeline.

[0022] In some embodiments, a deoxidation and dehumidification device is provided on the purification pipeline, and the deoxidation and dehumidification device is arranged close to the second control valve.

[0023] In some embodiments, a sixth valve and a seventh valve are respectively provided at the upstream and downstream ends of the deoxidation and dehumidification device;

[0024] The purification module further includes a third branch pipeline;

[0025] The third pipeline is respectively connected in parallel upstream of the sixth valve and downstream of the seventh valve, and an eighth valve is provided on the third pipeline.

[0026] In some embodiments, a fourth pipeline is further connected to the upstream side of the purification pipeline near the second control valve;

[0027] The fourth pipeline is provided with a ninth valve, and the fourth pipeline is provided with an exhaust gas interface.

[0028] Implementing the present utility model has the following beneficial effects: The lead-bismuth fast reactor coolant covering gas system includes a monitoring module and a purification module. During the normal operation stage of the unit, the monitoring module can monitor the radioactive content of the covering gas in real time, judge the nuclide composition, and at the same time, can monitor the impurity content of the covering gas in real time. The quality of the covering gas can be controlled through the purification module, and the recycling rate of the covering gas is improved through the way of cyclic purification, reducing the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0030] Figure 1 is a schematic diagram of the lead-bismuth fast reactor coolant covering gas system in some embodiments of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will be described in detail below with reference to the drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, and are constructed and operated in a specific orientation. It is only for the convenience of describing the technical solution, and does not indicate that the device or element referred to must have a specific orientation, so it cannot be understood as a limitation of the present utility model.

[0032] It should also be noted that, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. When a component is referred to as "above" or "below" another component, the component can be "directly" or "indirectly" located above the other component, or there may also be one or more intermediate components. Terms such as "first", "second", "third", etc. are only for the convenience of describing the technical solution of the present invention, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures, technologies, etc. are proposed to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0034] Please refer to Figure 1 , the present utility model shows a lead-bismuth fast reactor coolant cover gas system, which can be used to detect the cover gas of the lead-bismuth fast reactor 100, and can adjust and control the quality of the cover gas by purifying the cover gas. The lead-bismuth fast reactor 100 uses lead-bismuth eutectic alloy as the coolant, which belongs to the liquid metal cooled fast reactor together with the sodium-cooled fast reactor and is the main reactor type of the fourth generation nuclear energy system. The cover gas can be, including but not limited to, argon.

[0035] In some embodiments, the lead-bismuth fast reactor coolant cover gas system includes a monitoring module 10 and a purification module 20.

[0036] The monitoring module 10 may include a monitoring pipeline 11. The two ends of the monitoring pipeline 11 are respectively connected to the gas outlet end 101 and the gas return end 102 of the lead-bismuth fast reactor 100. A radiation monitoring device 12 and an on-line instrument 13 are provided on the monitoring pipeline 11.

[0037] Preferably, the radiation monitoring device 12 may include a radiation detector, which can be used to monitor alpha-ray radiation, beta-ray radiation, gamma-ray radiation, and / or X-ray radiation. In some embodiments, the radiation monitoring device 12 may select a radiation detector for gamma-ray radiation. The number of the radiation monitoring devices 12 may be one or more.

[0038] Preferably, the on-line instrument 13 may include a dew point meter, or the on-line instrument 13 may include a hydrogen meter, or the on-line instrument 13 may include an oxygen meter. The number of the on-line instruments 13 may be one or more. The setting modes of the on-line instrument 13 may be as follows: (1) The on-line instrument 13 may simply select a dew point meter, and the number of the dew point meters is one or more; (2) The on-line instrument 13 may simply select a hydrogen meter, and the number of the hydrogen meters is one or more; (3) The on-line instrument 13 may simply select an oxygen meter, and the number of the oxygen meters is one or more; (4) The on-line instrument 13 may be a dew point meter and a hydrogen meter, the number of the dew point meters is one or more, and the number of the hydrogen meters is one or more. (5) The on-line instrument 13 may be a dew point meter and an oxygen meter, the number of the dew point meters is one or more, and the number of the oxygen meters is one or more. (6) The on-line instrument 13 may be a hydrogen meter and an oxygen meter, the number of the hydrogen meters is one or more, and the number of the oxygen meters is one or more. (7) The on-line instrument 13 may be a dew point meter, a hydrogen meter, and an oxygen meter, the number of the dew point meters is one or more, the number of the hydrogen meters is one or more, and the number of the oxygen meters is one or more.

[0039] Furthermore, the set number and set position of the radiation monitoring device 12 and the on-line instrument 13 may be selected according to actual requirements, and no specific limitation is made here.

[0040] The purification module 20 may include a purification pipeline 21. The purification pipeline 21 is connected in parallel with the monitoring pipeline 11. A first control valve 22 and a second control valve 23 are respectively arranged at both ends of the purification pipeline 21. The first control valve 22 is arranged close to the air outlet end 101, and the second control valve 23 is arranged close to the air return end 102; A filtering device 24, a cooling device 25, a hydrogen elimination device 26, and a fan 27 are arranged on a section of the purification pipeline 21 between the first control valve 22 and the second control valve 23. The filtering device 24 and the cooling device 25 are arranged on the side close to the first control valve 22.

[0041] The filtering device 24 can be used to filter impurities in the covering gas flowing into the purification pipeline 21. The filtering device 24 may select a filter, such as an air filter, etc. The number of the filtering devices 24 may be one or more, and multiple filtering devices 24 can improve the filtering effect.

[0042] The cooling device 25 can be used to cool the covering gas flowing into the purification pipeline 21 to prevent the equipment in the purification pipeline 21 from being damaged due to excessive temperature of the covering gas. The cooling device 25 can be, including but not limited to, a shell-and-tube heat exchanger. In some embodiments, the cooling device 25 can be arranged at the upstream position of the filtering device 24.

[0043] The hydrogen elimination device 26 is mainly used to remove or reduce hydrogen in the covering gas. The hydrogen elimination device 26 includes, but is not limited to, a mobile hydrogen recombiner and a passive hydrogen recombiner.

[0044] The fan 27 can be used to drive the covering gas into the purification pipeline 21 and drive the covering gas to flow along the purification pipeline 21.

[0045] Among them, during the normal operation stage of the unit, the radiation monitoring device 12 can be used to monitor the radioactive content of the covering gas in real time and judge the nuclide composition. While the covering gas circulates in the monitoring pipeline 11, the on-line instrument 13 can monitor the impurity content of the covering gas in real time. When the impurities in the covering gas exceed the control requirement threshold, the purification module 20 is started. Taking hydrogen impurities as an example, when the monitoring module 10 monitors that the hydrogen concentration in the covering gas exceeds the standard, the first control valve 22 and the second control valve 23 are opened, and the fan 27 is started, so that the covering gas enters the purification pipeline 21. The covering gas is purified through the filtering device 24, the cooling device 25, and the hydrogen elimination device 26. The purified covering gas enters the monitoring pipeline 11 and returns to the lead-bismuth fast reactor 100 until the monitoring module 10 monitors that the hydrogen concentration in the covering gas is reduced to the low threshold, then the first control valve 22 and the second control valve 23 are closed, and the purification module 20 operates intermittently, and the monitoring module 10 continuously detects the covering gas.

[0046] In some embodiments, the monitoring module 10 may further include a pressure gauge, which can be used to monitor the pressure of the covering gas.

[0047] The lead-bismuth fast reactor coolant covering gas system further includes a pressure control module 30. The pressure control module 30 may include a pressure control pipeline 31. One end of the pressure control pipeline 31 is connected upstream of the fan 27, and the other end of the pressure control pipeline 31 is connected downstream of the second control valve 23. A buffer tank 32 is provided on the pressure control pipeline 31, and a reflux isolation valve 33 is provided between the buffer tank 32 and the upstream of the fan 27. The buffer tank 32 is connected with an intake pipeline 34 and an exhaust pipeline 35. An intake control valve 36 is provided on the intake pipeline 34, and an exhaust control valve 37 is provided on the exhaust pipeline 35. The intake pipeline 34 may be provided with an intake interface to be connected and communicated with a covering gas supply device or a covering gas supply system. The exhaust pipeline 35 may be provided with an exhaust interface to be connected and communicated with a covering gas collection device or a covering gas collection system. Both the intake interface and the exhaust interface can adopt quick interfaces.

[0048] Among them, when the covering gas pressure is relatively low, the intake regulating valve 36 opens to supplement gas, and the exhaust regulating valve 37 remains closed. Due to the pressure difference, the supplemented covering gas enters the buffer tank 32 through the intake pipeline 34 and then enters the lead-bismuth fast reactor 100 (such as entering the primary loop of the lead-bismuth fast reactor 100). When the covering gas pressure is relatively high, the intake regulating valve 36 closes, and the exhaust regulating valve 37 opens to exhaust gas. The exhausted covering gas enters the buffer tank 32 through the pressure control pipeline 31 and is then discharged from the exhaust pipeline 35.

[0049] When the purification module 20 is put into operation, the reflux isolation valve 33 opens, and an internal circulation can be formed to prevent the inside of the buffer tank 32 from becoming a dead zone and causing the accumulation of impurities such as lead-bismuth aerosol.

[0050] Continue to refer to Figure 1 , in some embodiments, a sampling pipeline 14 is further provided on the monitoring pipeline 11. The sampling pipeline 14 is provided with a sampling isolation valve 15 and a sampling interface 16, so as to facilitate sampling and detection of the covering gas in the monitoring pipeline 11.

[0051] In some embodiments, a heating device 17 is provided on one side of the monitoring pipeline 11 close to the gas return end 102. The heating device 17 operates continuously during the normal operation of the system to ensure that the gas temperature of the primary loop of the lead-bismuth fast reactor 100 fed back by the system is close to the gas extraction temperature of the system, reducing the influence of thermal stress. The heating device 17 may include, but is not limited to, an electric heater.

[0052] In some embodiments, a check valve 18 is provided on a section between the connection of the monitoring pipeline 11 and the purification pipeline 21.

[0053] The check valve 18 may be provided on a section of the monitoring pipeline 11 between the radiation monitoring device 12 and the gas return end 102, or the check valve 18 may be provided on a section of the monitoring pipeline 11 between the radiation monitoring device 12 and the heating device 17. That is, one end of the purification pipeline 21 may be connected to a section of the monitoring pipeline 11 between the radiation monitoring device 12 and the gas return end 102, or one end of the purification pipeline 21 may be connected to a section of the monitoring pipeline 11 between the radiation monitoring device 12 and the heating device 17.

[0054] Among them, by setting the check valve 18, the covering gas in the monitoring pipeline 11 can always enter from the gas outlet end 101 and flow back to the lead-bismuth fast reactor 100 from the gas return end 102.

[0055] In some embodiments, a first valve 261 and a second valve 262 are respectively provided at the upstream and downstream ends of the hydrogen elimination device 26. The purification module 20 further includes a first branch pipe 263, which is respectively connected in parallel upstream of the first valve 261 and downstream of the second valve 262. A humidifying device 28 is provided on the first branch pipe 263. A third valve 281 and a fourth valve 282 are respectively provided at the upstream and downstream ends of the humidifying device 28. The humidifying device 28 may include, but is not limited to, a humidifier, such as a wet film humidifier.

[0056] Further, the purification module 20 further includes a second branch pipe 264, which is respectively connected in parallel upstream of the first valve 261 and downstream of the second valve 262. A fifth valve 265 is provided on the second branch pipe 264.

[0057] Wherein, when hydrogen elimination and purification are required, the first valve 261 and the second valve 262 are opened, and the third valve 281, the fourth valve 282, and the fifth valve 265 are closed, so that the covering gas enters the hydrogen elimination device 26. When hydrogen reduction needs to be inhibited instead of hydrogen elimination and purification, the first valve 261, the second valve 262, and the fifth valve 265 are closed, and the third valve 281 and the fourth valve 282 are opened, so that the covering gas enters the humidifying device 28. When the hydrogen elimination device 26 and the humidifying device 28 are not needed, the first valve 261, the second valve 262, the third valve 281, the fourth valve 282 are closed, and the fifth valve 265 is opened. Different combinations of purification control functions can be realized by switching the bypass.

[0058] In some embodiments, an oxygen removal and dehumidification device 29 is provided on the purification pipeline 21, and the oxygen removal and dehumidification device 29 is arranged close to the second control valve 23. The oxygen removal and dehumidification device 29 may include, but is not limited to, a catalytic or adsorption type oxygen removal and dehumidification device, which reduces the oxygen concentration and moisture in the covering gas.

[0059] Further, a sixth valve 291 and a seventh valve 292 are respectively provided at the upstream and downstream ends of the oxygen removal and dehumidification device 29. The purification module 20 further includes a third branch pipe 293, which is respectively connected in parallel upstream of the sixth valve 291 and downstream of the seventh valve 292. An eighth valve 294 is provided on the third branch pipe 293.

[0060] Wherein, when oxygen removal and dehumidification are required, the sixth valve 291 and the seventh valve 292 are opened, and the eighth valve 294 is closed, and the covering gas enters the oxygen removal and dehumidification device 29. When oxygen removal and dehumidification are not required, the sixth valve 291 and the seventh valve 292 are closed, and the eighth valve 294 is opened. Different combinations of purification control functions can be realized by switching the bypass.

[0061] In some embodiments, a fourth branch pipe 210 is further connected to the upstream side of the purification pipeline 21 close to the second control valve 23. The fourth branch pipe 210 is provided with a ninth valve 211 and an exhaust gas interface 212, and the exhaust gas interface 212 can be connected to an exhaust gas collection device or an exhaust gas collection system. The fourth branch pipe 210 can be arranged between the upstream of the second control valve 23 and the downstream of the seventh valve 292.

[0062] Wherein, when the purification module 20 cannot effectively reduce the impurity concentration of the covering gas during long-term operation, or when it is necessary to reduce the radioactive concentration of the internal covering gas by purging and replacement, the intake regulating valve 36 of the pressure control module 30 and the exhaust gas interface 212 of the purification module 20 are opened to directly purge and replace the primary loop covering gas and the gas inside the system, and discharge it to the exhaust gas collection device or the exhaust gas collection system through the exhaust gas interface 212.

[0063] Take Figure 1 as an example. When purging and replacement are carried out, the first control valve 22, the fifth valve 265, the eighth valve 294, and the ninth valve 211 are opened, and the second control valve 23, the first valve 261, the second valve 262, the third valve 281, the fourth valve 282, the sixth valve 291, the seventh valve 292, and the exhaust regulating valve 37 are closed. The fan 27 is turned on. The covering gas in the covering gas supply device or the covering gas supply system enters the buffer tank 32 from the intake pipeline 34, then enters the pressure control pipeline 31 from the buffer tank 32, and enters the lead-bismuth fast reactor 100 (such as entering the primary loop of the lead-bismuth fast reactor 100) through the gas return end 102. The covering gas enters the purification pipeline 21 from the gas outlet end 101 and is discharged to the exhaust gas collection device or the exhaust gas collection system through the exhaust gas interface 212.

[0064] In some embodiments, the first control valve 22, the second control valve 23, the first valve 261, the second valve 262, the third valve 281, the fourth valve 282, the fifth valve 265, the sixth valve 291, the seventh valve 292, the eighth valve 294, the ninth valve 211, the reflux isolation valve 33, the intake regulating valve 36, and the exhaust regulating valve 37 can be selected as solenoid valves.

[0065] In some embodiments, the lead-bismuth fast reactor coolant covering gas system may further include a control device, which can be connected to some or all of the radiation monitoring device 12, on-line instrument 13, sampling isolation valve 15, heating device 17, first control valve 22, second control valve 23, filtering device 24, cooling device 25, hydrogen elimination device 26, first valve 261, second valve 262, fan 27, humidifying device 28, third valve 281, fourth valve 282, fifth valve 265, deoxidation and dehumidification device 29, sixth valve 291, seventh valve 292, eighth valve 294, ninth valve 211, reflux isolation valve 33, intake regulating valve 36, and exhaust regulating valve 37 by wireless or wired means for interlocking control.

[0066] The control device can be a nuclear island industrial control console, or it can be a PLC control terminal, which is not specifically limited here.

[0067] It can be understood that the lead-bismuth fast reactor coolant covering gas system includes a monitoring module 10 and a purification module 20. During the normal operation stage of the unit, the monitoring module 10 can monitor the radioactive content of the covering gas in real time, judge the nuclide composition, and at the same time, can monitor the impurity content of the covering gas in real time, and the purification module 20 can be used to control the quality of the covering gas.

[0068] The lead-bismuth fast reactor coolant covering gas system includes a pressure control module 30, which can perform pressure regulation operations on the covering gas.

[0069] In addition, the monitoring module 10, the purification module 20, and the pressure control module 30 cooperate with each other to perform replacement and purging operations on the covering gas.

[0070] It can be understood that the lead-bismuth fast reactor coolant covering gas system realizes the function of controlling the quality of the covering gas during the normal operation stage of the unit through internal circulation purification and relying on the on-line pressure regulation of the pressure control module 30. At the same time, the repeated utilization rate of the covering gas is improved through the way of circulating purification, and the operation cost is reduced.

[0071] The lead-bismuth fast reactor coolant covering gas system can accurately control the quality of the covering gas through the cooperation of the monitoring module 10 and the purification module 20.

[0072] Understandably, the above embodiments only represent the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several modifications and improvements can also be made, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A lead-bismuth fast reactor coolant cover gas system, characterized in that: It comprises a monitoring module (10) and a purification module (20); The monitoring module (10) comprises a monitoring pipeline (11), two ends of which are respectively connected to a gas outlet (101) and a gas return (102) of a lead-bismuth fast reactor, and a radiation monitoring device (12) and an online instrument (13) are provided on the monitoring pipeline (11); The purification module (20) comprises a purification pipeline (21), the purification pipeline (21) being connected in parallel with the monitoring pipeline (11), and a first control valve (22) and a second control valve (23) being respectively arranged at two ends of the purification pipeline (21), the first control valve (22) being arranged close to the gas outlet end (101), and the second control valve (23) being arranged close to the gas return end (102); a filtering device (24), a cooling device (25), a hydrogen removal device (26) and a fan (27) being arranged on a section of the purification pipeline (21) between the first control valve (22) and the second control valve (23), and the filtering device (24) and the cooling device (25) being arranged close to one side of the first control valve (22).

2. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The lead-bismuth fast reactor coolant cover gas system further comprises a pressure control module (30); The pressure control module (30) comprises a pressure control pipeline (31), one end of the pressure control pipeline (31) is connected to the upstream of the fan (27), and the other end of the pressure control pipeline (31) is connected to the downstream of the second control valve (23); a buffer tank (32) is provided on the pressure control pipeline (31), and a reflux isolation valve (33) is provided between the buffer tank (32) and the upstream of the fan (27); the buffer tank (32) is connected to an intake pipe (34) and an exhaust pipe (35), the intake pipe (34) is provided with an intake regulating valve (36), and the exhaust pipe (35) is provided with an exhaust regulating valve (37).

3. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The monitoring pipeline (11) is also provided with a sampling pipeline (14), and the sampling pipeline (14) is provided with a sampling isolation valve (15); the sampling pipeline (14) is provided with a sampling interface (16).

4. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: A heating device (17) is provided on the side of the monitoring pipeline (11) close to the gas return end (102).

5. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: A check valve (18) is provided on a section between the connection point of the monitoring pipeline (11) and the purification pipeline (21).

6. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The online instrument (13) comprises a dew point meter.

7. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The online instrument (13) comprises a hydrogen meter.

8. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The online instrument (13) comprises an oxygen meter.

9. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The upstream and downstream ends of the hydrogen removal device (26) are respectively provided with a first valve (261) and a second valve (262); The purification module (20) further includes a first pipeline (263); The first branch pipeline (263) is connected in parallel to the upstream of the first valve (261) and the downstream of the second valve (262), and a humidifying device (28) is provided on the first branch pipeline (263). A third valve (281) and a fourth valve (282) are provided at the upstream and downstream ends of the humidifying device (28), respectively.

10. The lead-bismuth fast reactor coolant cover gas system according to claim 9, characterized in that: The purification module (20) further includes a second branch pipeline (264); The second pipeline (264) is connected in parallel to the upstream of the first valve (261) and the downstream of the second valve (262); The second pipeline (264) is provided with a fifth valve (265).

11. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The purification pipeline (21) is provided with a deoxygenation and dehumidification device (29), and the deoxygenation and dehumidification device (29) is arranged close to one side of the second control valve (23).

12. The lead-bismuth fast reactor coolant cover gas system according to claim 11, characterized in that: The deoxygenation and dehumidification device (29) is provided with a sixth valve (291) and a seventh valve (292) at the upstream and downstream ends respectively; The purification module (20) further includes a third pipeline (293); The third branch pipeline (293) is connected in parallel to the upstream of the sixth valve (291) and the downstream of the seventh valve (292), and an eighth valve (294) is provided on the third branch pipeline (293).

13. The lead-bismuth fast reactor coolant cover gas system according to claim 1, characterized in that: The purification pipeline (21) is also connected to a fourth branch pipeline (210) on the upstream side close to the second control valve (23); The fourth branch pipeline (210) is provided with a ninth valve (211), and the fourth branch pipeline (210) is provided with an exhaust gas interface (212).

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