CN114887445A - Polonium removal system and method for lead bismuth cooled reactor - Google Patents
Polonium removal system and method for lead bismuth cooled reactor Download PDFInfo
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- CN114887445A CN114887445A CN202210293734.8A CN202210293734A CN114887445A CN 114887445 A CN114887445 A CN 114887445A CN 202210293734 A CN202210293734 A CN 202210293734A CN 114887445 A CN114887445 A CN 114887445A
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Abstract
The examples of the invention disclose a polonium removal system and method for a lead bismuth cooled reactor. Wherein the polonium removal system is connected to the reactor vessel of the lead-bismuth cooled reactor for removing polonium aerosol in a cover gas in the reactor vessel. The polonium removal system comprises: an adsorption device, in which an adsorption module is installed, for adsorbing polonium in the cover gas; the gas circulation pipeline is arranged between the adsorption device and the reactor vessel, and is provided with a circulating pump which is used for conveying the cover gas in the reactor vessel to the adsorption device and conveying the cover gas subjected to adsorption and purification back to the reactor vessel; a polonium monitoring device disposed on the gas circulation line for monitoring polonium content in the blanket gas.
Description
Technical Field
The embodiment of the invention relates to the technical field of radioactive substance treatment, in particular to a polonium removal system and method for a lead-bismuth cooled reactor.
Background
The liquid lead bismuth alloy is a good coolant for the block neutron reactor. When the liquid lead bismuth alloy is used as a coolant of a fast neutron reactor, radioactive polonium is generated after the lead bismuth alloy is subjected to neutron radiation, and the risk is high. And, because polonium has strong volatility, under high temperature conditions, polonium volatilizes from the liquid lead-bismuth alloy coolant into the blanket gas above the coolant, so that a certain amount of radioactive polonium exists in the blanket gas.
Therefore, in order for a lead bismuth-cooled reactor to operate safely and to prevent the leakage or venting of cover gases containing radioactive polonium to the atmosphere, it is necessary to remove the polonium from the cover gas.
Disclosure of Invention
According to one aspect of the present invention, a polonium removal system for a lead bismuth cooled reactor is provided. The polonium removal system is connected to the reactor vessel of the lead-bismuth cooled reactor for removing polonium aerosol in the cover gas in the reactor vessel. The polonium removal system comprises: an adsorption device, in which an adsorption module is installed, for adsorbing polonium in the cover gas; the gas circulation pipeline is arranged between the adsorption device and the reactor vessel, and is provided with a circulating pump which is used for conveying the cover gas in the reactor vessel to the adsorption device and conveying the cover gas subjected to adsorption and purification back to the reactor vessel; a polonium monitoring device disposed on the gas circulation line for monitoring polonium content in the blanket gas.
According to another aspect of the invention, a method for polonium removal for a lead bismuth cooled reactor is provided. The polonium removal method comprises the following steps: starting a circulating pump on a gas circulating pipeline in a polonium removal system, and conveying cover gas in a reactor container to an adsorption device so as to enable polonium aerosol in the cover gas to be adsorbed on an adsorption module in the adsorption device; conveying the cover gas subjected to adsorption purification back to the reactor container; the cover gas in the reactor vessel is cyclically adsorbed until the polonium content in the cover gas reaches a predetermined level, and gas circulation in the gas circulation line is stopped.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, and may help to provide a full understanding of the present invention.
Fig. 1 is a schematic diagram of the structure of a polonium removal system according to one embodiment of the present invention.
Fig. 2 is a schematic diagram of the structure of an adsorption device in a polonium removal system according to one embodiment of the present invention.
Fig. 3 is a schematic flow diagram of a polonium removal process according to one embodiment of the present invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Description of the reference numerals:
10. an adsorption device; 20. an isolation valve; 30. a circulation pump; 40. a vacuum device; 50. an inert gas device; 60. a polonium monitoring device; 70. a heat tracing and heat insulating device; 81. a flow measuring device; 82. a pressure measuring device; 83. a temperature measuring device; 90. sealing the transfer device; 200. a reactor vessel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in detail and completely with reference to the accompanying drawings of the embodiments of the present application. It should be apparent that the described embodiment is one embodiment of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
It is to be noted that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.
Fig. 1 shows a schematic diagram of a polonium removal system according to one embodiment of the present invention. The polonium removal system of this example was used in a lead bismuth reactor, and was connected to the reactor vessel of the lead bismuth reactor for removing polonium aerosol from the cover gas within the reactor vessel. The inert gas is a gas for protecting the coolant and/or the coolant line in the reactor vessel, and an inert gas, such as argon, is generally used as the cover gas.
As shown in fig. 1, the polonium removal system of the present embodiment includes an adsorption apparatus 10, a gas circulation line, and a polonium monitoring apparatus 60. Wherein, an adsorption module 13 is installed in the adsorption device 10, and the adsorption module 13 is used for adsorbing polonium (Po-210) in the cover gas. The gas circulation pipeline is arranged between the adsorption device 10 and the reactor vessel 200, the gas circulation pipeline is provided with a circulation pump 30, and the circulation pump 30 is used for conveying the cover gas in the reactor vessel 200 to the adsorption device 10 and conveying the cover gas after adsorption and purification back to the reactor vessel 200, so that the cover gas in the reactor vessel circulates in the gas circulation pipeline. The polonium monitoring device 60 is disposed on the gas circulation line for monitoring the polonium content in the cover gas, thereby determining whether the cover gas in the reactor vessel meets the purification requirements.
With the polonium removal system in this embodiment, polonium aerosol generated during the operation of the lead-bismuth reactor can be removed, and polonium in the cover gas in the reactor vessel can be removed by adsorbing the polonium aerosol. And the radioactive cover gas adopts a loop structure design between the polonium removal system and the reactor container, so that the radioactive gas forms closed circulation, the risk of leakage of the radioactive gas is reduced, and polonium in the cover gas can be continuously, efficiently and safely adsorbed and removed.
Circulating pump 30 on the gas circulation pipeline in this embodiment can be used for adjusting the gas flow in the gas circulation pipeline, and operating personnel can get rid of the running state of system according to polonium, adjusts gas flow in real time through the circulating pump. Optionally, the circulating pump in this embodiment may be in a range of 0 to 5.0m 3 The gas flow is adjusted in the range of/h. In addition, the leakage rate of the gas circulation pipeline in the embodiment is extremely small and is not more than 1 multiplied by 10 -7 Pa·m/s。
In addition, the gas circulation pipeline in this embodiment is further provided with a measuring device for measuring a gas parameter of the gas in the gas circulation pipeline, wherein the gas parameter of the gas includes at least one of flow rate, pressure and temperature of the gas. The measuring means includes at least one of a flow measuring device 81, a pressure measuring device 82, and a temperature measuring device 83.
In some embodiments, the polonium removal system may be coupled to a lead bismuth cooled reactor. An isolation valve 20 is disposed between the polonium removal system and the reactor vessel, and the isolation valve 20 may be selectively opened or closed. When the isolation valve is opened, gas communication can be performed between the inside of the reactor vessel and the polonium removal system; when the isolation valve is closed, gas cannot circulate between the inside of the reactor vessel and the inside of the polonium removal system, so that the polonium removal system is isolated from the reactor vessel.
Fig. 2 shows a schematic structural view of an adsorption apparatus according to an embodiment of the present invention. As shown in fig. 2, a plurality of adsorption modules 13 are installed in the adsorption apparatus 10 in this embodiment. The plurality of adsorption modules 13 are arranged in parallel, and a predetermined interval is provided between two adjacent adsorption modules. The blanket gas in the reactor vessel 200 is introduced from the inlet 11 of the adsorption apparatus 10 through a gas circulation line, and flows into the flow channels in the adsorption apparatus 10 along the intervals between the adsorption modules in the adsorption apparatus 10.
The adsorption apparatus 10 in this embodiment is provided with a flow distributor and a plurality of flow channels, wherein the flow channels are used for allowing the cover gas to flow, and the flow distributor is used for distributing the cover gas entering the adsorption apparatus 10 to each flow channel. The flow distributor is disposed near the inlet of the adsorption apparatus 10, and the cover gas introduced from the inlet is distributed to the flow channels through the flow distributor, and the flow channels may pass through the adsorption modules 13, so that the cover gas flows through the adsorption modules 13 through the flow channels and then flows out of the outlet 12 of the adsorption apparatus 10 into the gas circulation line. As shown in fig. 2, the blanket gas flows in the flow direction a within the adsorption device 10, wherein the inlets of the flow channels may be arranged in the spaces between the adsorption modules 13. The adsorption module 13 in this embodiment can maximally adsorb and fix polonium aerosol in the blanket gas, thereby implementing adsorption and purification of the blanket gas.
Optionally, a serpentine flow channel is disposed between the adsorption modules 13 in the adsorption apparatus 10, and the cover gas flows in the serpentine flow channel and passes through each adsorption module 13 multiple times, so that the polonium aerosol in the cover gas is adsorbed and fixed to the adsorption modules 13, thereby achieving cover gas purification.
In this embodiment, the adsorption module 13 includes a metal net and a non-metal film wrapped outside the metal net. The non-metal film may be made of a polymer material such as cellulose or resin, or may be made of an oxide material such as silicon dioxide or manganese dioxide, or a composite material based on the oxide material. The metal mesh can be a wire mesh made of gold, silver, platinum, stainless steel and other materials. Alternatively, the non-metallic membrane or metallic mesh may be arranged in a single layer or in multiple layers in an overlapping arrangement to physically adsorb and filter the blanket gas mixed with polonium aerosol.
In some embodiments, a chemical adsorption unit is further disposed in the adsorption module 13, and the chemical adsorption unit may be disposed between two metal nets, two non-metal films, or between a metal net and a non-metal film. For example, the adsorption module 13 is provided with a non-metal film, a metal net, a chemical adsorption unit, a metal net, and a non-metal film in sequence from one side to the other side. The chemisorption unit utilizes a chemical reaction to convert Po-210 and its compounds to other stable compounds containing Po-210, thereby completing the removal of Po-210.
With the adsorption apparatus 10 in this embodiment, polonium in the blanket gas can be adsorbed mainly by physical adsorption and secondarily by chemical adsorption to purify the blanket gas.
As shown in fig. 1, the polonium monitoring device 60 in the present embodiment is disposed on the gas circulation line before the inlet of the adsorption device 10, and/or on the gas circulation line after the outlet of the adsorption device 10. The polonium monitoring device 60 in this embodiment can monitor the polonium content of the gas in the gas circulation pipeline, so as to provide a judgment basis for the adsorption efficiency and the purification effect of the polonium removal system.
Alternatively, the polonium monitoring device 60 may be detected by on-line enrichment of the sample.
The polonium monitoring device 60 disposed before the inlet of the adsorption device 10 may monitor the polonium content of the cover gas delivered from the reactor vessel, thereby determining whether the cover gas in the reactor vessel meets the purification requirement. After the cover gas in the reactor vessel meets the purification requirement, the gas flow can be adjusted by the circulating pump 30 on the gas circulating pipeline, so that the gas flow in the gas circulating pipeline is gradually reduced until the gas flow is zero, and the purification of the cover gas in the reactor vessel is completed.
Meanwhile, a polonium monitoring device 60 disposed after the outlet of the adsorption device 10 may monitor the polonium content of the blanket gas purified by adsorption by the adsorption device 10. According to the monitoring results of the polonium monitoring devices 60 before and after the adsorption device 10, the adsorption efficiency of the adsorption device 10 can be judged.
The working gas environment of the adsorption device 10 in this embodiment is a cover gas and radioactive polonium aerosol, and the polonium removal system further includes a vacuum device 40 and an inert gas device 50 to maintain the working gas environment of the adsorption device 10.
As shown in fig. 1, the vacuum apparatus 40 is connected to the adsorption apparatus for adjusting the pressure of the gas in the adsorption apparatus to maintain the working gas environment required by the adsorption apparatus while maintaining the polonium removal system in gas equilibrium with the reactor vessel.
The polonium removal system further includes an inert gas device 50, wherein the inert gas device 50 is connected to the adsorption device 10, and is configured to provide the adsorption device 10 with an inert gas that is the same as the cover gas in the reactor vessel 200, provide the adsorption device with a required working gas environment, maintain the required working gas environment of the adsorption device, and simultaneously maintain the gas balance between the polonium removal system and the reactor vessel.
In addition, the adsorption device 10 may be operated at a higher temperature. The adsorption device 10 in the embodiment can be used for adsorbing the covering gas in the lead-bismuth cooling reactor, the working temperature of the adsorption device is 200-400 ℃, and the working pressure is-0.1 MPa-0.5 MPa.
As shown in fig. 1, the polonium removal system in this embodiment further includes a closed transfer device 70. The closed transfer device 70 is used for disassembling, replacing and sealing and transferring the adsorption module 13 in the adsorption device 10.
After the absorption and purification of the cover gas in the reactor vessel and the separation of the polonium removal system and the reactor vessel are completed, the absorption module with polonium adsorbed and fixed in the absorption device can be detached by the closed transfer device 70, and the polonium is automatically packaged and transferred to a designated area in a sealed manner for proper disposal. After the used adsorption module 13 having polonium fixed thereon is detached, a new adsorption module 13 may be installed by the sealed transfer device 70 to perform the next gas purification. The leakage rate of the closed transfer device 70 in the embodiment is small and is not more than 1 multiplied by 10 -8 Pa · m/s, reduces the risk of radioactive leakage.
As shown in fig. 1, the polonium removal system also includes a heat tracing holding apparatus 90. The heat tracing and heat insulating device 90 is arranged at the position close to the inlet of the reactor vessel 200 and on the gas circulation pipeline and used for heating and insulating the purified cover gas, so that the purified cover gas is heated to the temperature level equal to that of the cover gas in the reactor vessel 200 and is insulated, and then enters the reactor vessel, thereby avoiding the thermal disturbance caused by the overlarge temperature difference and damaging the thermal balance in the reactor vessel.
Optionally, the heat tracing insulation device 90 may be a heating tape wrapped on the gas circulation pipeline, and may heat the gas in the gas circulation pipeline. Optionally, temperature measuring devices 83 are provided on the gas circulation lines near the inlet and outlet of the reactor vessel. The temperature measuring device 83 at the outlet can measure the temperature of the cover gas in the reactor vessel 200, and provides reference data for the heating of the cover gas by the heat tracing and heat insulating device 90, so that the purified gas is heated to be consistent with the temperature of the gas in the reactor vessel 200. The temperature measuring device 83 at the inlet may measure the temperature of the cleaned blanket gas to determine if it needs to be heated.
In addition, the polonium removal system further includes a control device (not shown) connected to at least one of the circulation pump 30, the vacuum device 40, the inert gas device 50, and the heat tracing insulation device 90 on the gas circulation line for controlling gas parameters within the gas circulation line.
Alternatively, when the adsorption efficiency of the adsorption apparatus 10 does not meet the standard, the parameters of the gas in the polonium removal system may be adjusted according to the parameters of gas flow, pressure, temperature, etc. monitored by the measurement device in the gas circulation line, so as to make the adsorption efficiency of the adsorption apparatus meet the standard.
The polonium removal system in the embodiment of the invention has the characteristics of safe and stable operation and high adsorption efficiency, and can realize the functions of online enrichment, detection and removal of polonium in a lead-bismuth cooled reactor. The polonium removal system in the embodiment of the invention mainly adopts physical adsorption and secondarily adopts chemical adsorption, so that polonium in cover gas in the lead-bismuth cooled reactor can be safely and efficiently removed. And, the polonium removal system adopts a loop structure design, so that the radioactive cover gas and the polonium aerosol mixed therein form a closed cycle, and the risk of radioactive gas leakage is reduced.
The embodiments of the present invention also provide a polonium removal method for lead bismuth cooled reactors. The polonium removal method of the present embodiment can be implemented using the polonium removal system of the above embodiment. In addition, the polonium removal process in this example may be performed when the reactor is shut down.
Fig. 3 shows a flow diagram of a polonium removal process according to one embodiment of the present invention. As shown in fig. 3, the polonium removal method of this embodiment includes the following steps.
In step S10, the circulation pump on the gas circulation line in the polonium removal system is started.
Step S20, controlling the cover gas in the reactor vessel to circulate in the polonium removal system, wherein the circulation pump delivers the cover gas in the reactor vessel to an adsorption device, so that the polonium aerosol in the cover gas is adsorbed by an adsorption module in the adsorption device; and conveying the cover gas subjected to adsorption purification back to the reactor container.
In step S30, polonium content in the blanket gas is monitored in real time.
In step S40, when the polonium content in the blanket gas reaches a predetermined level, the gas circulation in the gas circulation line is stopped.
Specifically, in step S10, before the circulation pump is started, the operation state of the polonium removal system needs to be detected to ensure that the devices, apparatuses and meters in the system operate stably, and the polonium removal system has a purifying capability of removing polonium from the cover gas in the reactor vessel.
In addition, before starting, an isolation valve between the reactor and the polonium removal system needs to be opened to release the separation of the polonium removal system from the reactor, so as to start the polonium removal system.
In this embodiment, after starting the circulation pump on the gas circulation line between the reactor vessel and the polonium removal system, the circulation pump may be controlled to control the gas flow rate in the gas circulation line at a lower predetermined flow rate level to establish a gas circulation loop in the polonium removal system. Wherein the predetermined flow level may be set to 0.5m 3 /h。
Further, after the polonium removal system is stably operated, the flow rate of the circulating gas in the gas circulation line may be gradually increased.
In step S20, when the cover gas is circulated in the polonium removal system, the adsorption device in the adsorption device may adsorb the polonium aerosol in the cover gas through the adsorption device, thereby purifying the cover gas. The purified covering gas is conveyed back to the reactor container through a gas circulation pipeline, so that the covering gas in the reactor container is subjected to cyclic adsorption.
When the polonium content of the blanket gas reaches a predetermined level, the gas circulation in the gas circulation line may be stopped, thereby completing the purging of the blanket gas within the reactor vessel.
In some embodiments, the polonium content of the gas entering and/or exiting the adsorption device may be monitored in real time as the cover gas in the reactor vessel is circulated through the polonium removal system to determine whether the polonium content of the cover gas in the reactor vessel meets a predetermined standard.
Alternatively, the adsorption efficiency of the adsorption device may also be determined in real time based on the polonium content of the gas entering and exiting the adsorption device. In some embodiments, the adsorption efficiency may be determined by a first indication of a polonium monitoring device after the outlet of the adsorption device and a second indication of a polonium monitoring device before the inlet of the adsorption device. For example, when the first index is 5% or less of the second index, it may be determined that the adsorption efficiency of the adsorption apparatus at this time is 95% or more.
In order to maximize the utilization of the adsorption device, the adsorption efficiency of the adsorption device may be controlled above a predetermined efficiency. For example, the adsorption efficiency of the adsorption apparatus is set to 95%. In this embodiment, the adsorption efficiency of the adsorption device can be adjusted by adjusting the gas parameters in the gas circulation line. Wherein the gas parameter comprises at least one of flow, pressure, temperature of the gas.
Specifically, the adsorption efficiency can be adjusted by adjusting the gas flow rate in the gas circulation line. When the adsorption efficiency of the adsorption device is greater than the predetermined efficiency, the flow rate of the circulating gas in the system can be increased appropriately by controlling the circulating pump to maximize the utilization of the adsorption modules in the adsorption device, and the purification of the blanket gas in the reactor vessel can be rapidly realized by the adsorption modules. When the adsorption efficiency of the adsorption device is less than the predetermined efficiency, the flow rate of the circulating gas in the system can be reduced by controlling the circulating pump, so that the adsorption efficiency of the adsorption device is over 95 percent, and thus the efficient removal of polonium is realized.
In this example, the polonium removal system was operated under a gas atmosphere blanketing with gas and polonium aerosol. By controlling the vacuum and/or inert gas devices, the gas environment in the adsorption unit can be maintained, and the balance of polonium removal system and gas within the reactor vessel can also be maintained.
In addition, when the cover gas circulates in the polonium removal system, the gas circulation pipeline close to the inlet of the reactor vessel can be subjected to heat tracing and heat preservation, so that the cover gas after adsorption and purification is heated to the same temperature as the cover gas in the reactor vessel and then is conveyed back to the reactor vessel, and the phenomenon that the temperature difference is too large to cause thermal disturbance and destroy the thermal balance in the reactor vessel is avoided.
In step S30, the polonium content of the blanket gas in the reactor vessel is monitored in real time by a polonium monitoring device before the adsorption device during the gas cycle.
When the polonium content in the cover gas in the reactor vessel reaches a predetermined level, the gas flow in the gas circulation line may be slowly decreased to 0m 3 Per hour, bring out polonium removal system. The predetermined standard may be set according to actual needs, and the polonium content below the predetermined standard may be considered to be the completion of blanket gas purification.
After the operation of the polonium removal system is stopped, the isolation valve between the reactor vessel and the polonium removal system is closed, the polonium removal system is isolated from the reactor vessel, and the adsorption and purification of the cover gas in the reactor vessel are finished.
After adsorption purification is finished, the adsorption modules in the adsorption device are disassembled and sealed to be transferred, and new adsorption modules are installed in the adsorption device. In particular, the adsorbent modules in the adsorbent device may be packaged and sealed using a closed transfer device and then transferred to a designated area for proper disposal. Simultaneously, install new adsorption module for adsorption equipment through airtight transfer system to carry out next gas purification.
And finally, after the adsorption module in the adsorption device is replaced, controlling the reactor to recover to operate.
By adopting the polonium removal method in the embodiment, polonium in the cover gas in the lead-bismuth cooled reactor can be safely, efficiently and continuously removed, and the risk of radioactive gas leakage is reduced.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (20)
1. A polonium removal system for lead bismuth cooled reactor is characterized in that,
the polonium removal system is connected to the reactor vessel of the lead-bismuth cooled reactor for removing polonium aerosol in a cover gas in the reactor vessel;
the polonium removal system comprises:
an adsorption device, in which an adsorption module is installed, for adsorbing polonium in the cover gas;
the gas circulation pipeline is arranged between the adsorption device and the reactor vessel, and is provided with a circulating pump which is used for conveying the cover gas in the reactor vessel to the adsorption device and conveying the cover gas subjected to adsorption and purification back to the reactor vessel;
A polonium monitoring device disposed on the gas circulation line for monitoring polonium content in the blanket gas.
2. The polonium removal system of claim 1, wherein an isolation valve is disposed between the polonium removal system and the reactor vessel, the isolation valve being selectively openable or closable for controlling gas communication between the polonium removal system and the reactor vessel.
3. The polonium removal system of claim 1, wherein a plurality of adsorption modules are installed at intervals in the adsorption apparatus.
4. The polonium removal system of claim 3, wherein the adsorption module has a flow distributor and a plurality of flow channels disposed therein;
wherein the flow distributor is configured to distribute the cover gas entering the adsorption device to the plurality of flow channels;
the flow channel is used for flowing the covering gas and is connected with a plurality of adsorption modules.
5. A polonium removal system of any of claims 1-4 wherein the adsorption module comprises: the metal net and the non-metal film wrapped outside the metal net.
6. The polonium removal system of claim 1, wherein the polonium monitoring device is disposed on a gas circulation line before the inlet of the adsorption device and/or on a gas circulation line after the outlet of the adsorption device.
7. The polonium removal system of claim 1, further comprising: the vacuum device is connected with the adsorption device and is used for adjusting the pressure of the gas in the adsorption device.
8. A polonium removal system according to claim 1 or 7, further comprising: and the inert gas device is connected with the adsorption device and used for providing the adsorption device with the inert gas which is the same as the covering gas in the reactor container.
9. The polonium removal system of claim 1, further comprising: and the closed transfer device is used for disassembling, replacing and hermetically transferring the adsorption module in the adsorption device.
10. The polonium removal system of claim 1, further comprising: and the heat tracing and heat insulating device is arranged on the gas circulation pipeline close to the inlet of the reactor vessel and is used for heating and insulating the purified cover gas.
11. The polonium removal system of claim 1, further comprising: and the gas measuring device is arranged on the gas circulating pipeline and used for measuring the gas parameters of the gas in the gas circulating pipeline.
12. A polonium removal system according to any one of claims 1-11 comprising:
And the control device is connected with at least one of the circulating pump, the vacuum device, the inert gas device and the heat tracing and heat insulating device on the gas circulating pipeline and is used for controlling gas parameters in the gas circulating pipeline.
13. A polonium removal method for a lead-bismuth cooled reactor, comprising:
starting a circulating pump on a gas circulating pipeline in the polonium removal system,
controlling a cover gas in a reactor vessel to circulate in a polonium removal system, wherein the circulation pump delivers the cover gas within the reactor vessel to an adsorption device to cause polonium aerosol in the cover gas to be adsorbed by an adsorption module within the adsorption device; conveying the cover gas subjected to adsorption purification back to the reactor container;
the polonium content of the blanket gas was monitored in real time,
when the polonium level in the blanket gas reaches a predetermined level, the gas circulation in the gas circulation line is stopped.
14. The method of claim 13 wherein a vacuum device and/or an inert gas device is controlled to maintain a gas environment in the adsorption device and/or a polonium removal system in equilibrium with the gases within the reactor vessel.
15. The method of claim 13 wherein the polonium content of the gas entering and/or exiting the adsorption unit is monitored to determine whether the polonium content of the blanket gas in the reactor vessel meets a predetermined criterion.
16. The method of claim 15 wherein the adsorption efficiency of the adsorption unit is determined according to the polonium content of the gas entering and exiting the adsorption unit.
17. The method of claim 16, wherein a gas parameter in the gas circulation line is adjusted to adjust the adsorption efficiency of the adsorption device.
18. The method of claim 17, wherein the gas parameters comprise: at least one of flow rate, pressure, temperature of the gas.
19. The method of claim 13, wherein the gas circulation line near the reactor vessel inlet is heat traced to heat the blanket gas after adsorptive cleaning to the same temperature as the blanket gas in the reactor vessel and then returned to the reactor vessel.
20. The method of claim 13, further comprising:
after adsorption purification is finished, the adsorption modules in the adsorption device are disassembled and sealed to be transferred, and new adsorption modules are installed in the adsorption device.
Priority Applications (1)
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