Activated carbon replacement system and method for iodine adsorber

Abstract

The invention provides an iodine adsorber activated carbon replacement system and method, the replacement system is communicated with an iodine adsorber and a material barrel through pipelines, the replacement system comprises a stock bin, a filtering module and a power module, and the stock bin is used for storing activated carbon materials in the iodine adsorber or the material barrel; the filtering module is used for filtering dust impurities in the pipeline; the power module is used for adjusting the replacement system to be in a positive / negative pressure state, so that the activated carbon material is transferred among the iodine adsorber, the stock bin and the charging basket. By adopting the replacement system of the compression fan, the whole replacement system has a positive / negative pressure function under different formed control loops, the positive / negative pressure in the replacement system is utilized to enable the replacement system to be in different air pressure states to form suction force and thrust force, activated carbon in the iodine adsorber is loaded and unloaded, and the replacement efficiency is improved. The problem that unsafe behaviors are caused by the adoption of a charging basket inversion method in unloading of invalid activated carbon and filling of new activated carbon in the iodine adsorber of the nuclear power station is solved.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant radioactive gas purification, and in particular to an iodine adsorber activated carbon replacement system and replacement method. Background Art

[0002] During the operation and maintenance of nuclear power plants, a large amount of radioactive smoke and aerosols will be generated. If these radioactive smoke and aerosols are not purified and filtered and directly discharged into the atmosphere, they will pose a serious threat to the environment and public safety. Therefore, radioactive aerosols and smoke need to be purified and filtered before they are discharged, and then discharged after meeting the emission standards. The radioactive smoke and aerosols in the nuclear environment contain a large amount of radioactive iodine isotopes. The thyroid gland in the human body has a high absorption capacity for iodine. Therefore, the iodine in the radioactive air must be adsorbed and purified to avoid harm to the operators. The nuclear power plant uses activated carbon purification media to adsorb radioactive iodine. As a nuclear power unit with completely independent intellectual property rights in my country, "Hualong One" uses Type III iodine adsorbers and fills activated carbon inside to purify the air in the radioactive environment.

[0003] After long-term service, the activated carbon in the iodine adsorber has a reduced adsorption efficiency and cannot effectively purify the iodine in the radioactive air, which can easily cause leakage of radioactive substances. In order to ensure that the activated carbon in the iodine adsorber always maintains a qualified purification efficiency, the purification efficiency of the activated carbon in the iodine adsorber is tested. When the purification efficiency does not meet the use requirements, the activated carbon in the iodine adsorber needs to be replaced. Due to the complex environment of the iodine adsorber, the narrow space of the equipment transportation channel, and the existing method of replacing by inverting the barrel, there are serious safety hazards, which brings great difficulties to the replacement of activated carbon on-site in nuclear power plants.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention and does not constitute any limitation to the present invention. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the present invention provides an iodine adsorber activated carbon replacement system and replacement method. By adopting a replacement system with a compression fan, the replacement system is placed in different air pressure states to form suction and thrust, so as to have the functions of unloading and loading activated carbon, so as to solve the problem of unsafe behavior caused by the inverted barrel method in the unloading of failed activated carbon and the loading of new activated carbon in the iodine adsorber of a nuclear power plant.

[0006] The present invention provides an iodine adsorber activated carbon replacement system. The replacement system is connected to the iodine adsorber and a barrel through pipelines, respectively. The replacement system comprises a silo, a filter module and a power module. The silo is used to store activated carbon materials in the iodine adsorber or the barrel; the filter module is used to filter dust and impurities in the pipeline; and the power module is used to adjust the replacement system to a positive / negative pressure state so that the activated carbon materials can be transferred between the iodine adsorber, the silo and the barrel.

[0007] In one embodiment of the present invention, the silo, the filter module and the power module are connected by pipelines, the silo is respectively connected to the discharge end of the barrel and the feed end of the iodine adsorber through pipelines, and the discharge end of the iodine adsorber is connected to the feed end of the barrel.

[0008] In one embodiment of the present invention, the pipelines between the replacement system, the iodine adsorber and the barrel are detachably connected, and the on-off state of each pipeline is controlled by a valve.

[0009] In one embodiment of the present invention, in the unloading mode of the replacement system, the discharge end of the iodine adsorber is connected to the feed end of the unloading barrel, the discharge end of the barrel is connected to the silo, the silo, the filtration module and the power module are connected in sequence, and the power module is also connected to the feed end of the iodine adsorber; the power module provides negative pressure to the connected barrel and positive pressure to the connected iodine adsorber through the silo to transfer the activated carbon material in the iodine adsorber to the barrel.

[0010] In one embodiment of the present invention, in the filling mode of the replacement system, the discharge end of the barrel filled with activated carbon material is connected to the silo, the silo, the filter module and the power module are connected in sequence, and the power module is also connected to the feed end of the iodine adsorber through the silo; the power module provides negative pressure to the connected silo to extract the activated carbon material in the barrel, and then provides positive pressure to the connected silo to blow the activated carbon material into the iodine adsorber.

[0011] In one embodiment of the present invention, a boosting module is further included. The boosting module is connected to the silo through a pipeline, and in the filling mode of the replacement system, the boosting module is connected to the feed end of the iodine adsorber through the silo together with the power module.

[0012] In one embodiment of the present invention, a distribution module is further included, and the distribution module is used to control the amount of activated carbon material blown into the pipeline in the filling mode.

[0013] The present invention also provides a method for replacing activated carbon in an iodine adsorber, comprising:

[0014] Determine whether to execute the activated carbon unloading mode or the activated carbon filling mode according to the operating state of the iodine adsorber;

[0015] Based on the activated carbon unloading mode, negative pressure is formed in the replacement system connected to the iodine adsorber to extract and unload the activated carbon in the iodine adsorber;

[0016] Based on the activated carbon filling mode, a positive pressure is formed in the replacement system connected to the iodine adsorber, and the activated carbon in the silo is blown and filled into the iodine adsorber.

[0017] In one embodiment of the present invention, the step of executing the activated carbon unloading mode or the activated carbon filling mode further includes starting a purification filtration module based on a purification circulation loop formed between the iodine adsorber, the replacement system and the barrel.

[0018] In one embodiment of the present invention, the step of executing the activated carbon filling mode further includes determining whether to start the air volume boosting module based on the model and size of the iodine adsorber.

[0019] The beneficial effects of the present invention are as follows: a method and system for replacing activated carbon in an iodine adsorber is provided, by enabling the entire replacement system to have positive / negative pressure functions under different control loops, and utilizing the positive / negative pressure in the replacement system to complete the loading and unloading of activated carbon in the iodine adsorber. It is used for replacing activated carbon in iodine adsorbers in nuclear power plants, meeting the use requirements of complex on-site working conditions and ensuring the safety of personnel during operations. By adopting this method, the unloading of failed activated carbon and the loading of new activated carbon in the iodine adsorber can be achieved, so that the iodine adsorber always maintains a high purification and filtration efficiency, and realizes the green, clean, efficient, safe and stable operation of nuclear power units.

[0020] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 It is a schematic diagram of the iodine adsorber activated carbon replacement system of the present invention in the activated carbon unloading mode;

[0023] Figure 2 It is a schematic diagram of the activated carbon replacement system of the iodine adsorber of the present invention in the activated carbon filling mode;

[0024] Figure 3 This is an operation flow chart of the iodine adsorber activated carbon replacement system of the present invention;

[0025] Figure 4 The present invention is a flow chart of the method for replacing activated carbon in an iodine adsorber.

[0026] In the figure: 1. iodine adsorber; 2. barrel; 31. silo; 32. filter module; 33. power module; 34. boost module; 35. control module. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied by other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are to describe specific specific embodiments, rather than to limit the scope of protection of the present invention.

[0028] See also Figures 1 to 4 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any structural modification, change in proportional relationship, or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as position and quantitative relationship cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0029] See also Figure 1 and Figure 2 The present invention provides an iodine adsorber activated carbon replacement system, the replacement system is connected to the iodine adsorber 1 and the barrel 2 through pipelines, the replacement system includes a silo 31, a filter module 32 and a power module 33, the silo 31 is used to store the activated carbon material in the iodine adsorber 1 or the barrel 2; the filter module 32 is used to filter dust and impurities in the pipeline; the power module 33 is used to adjust the replacement system to a positive / negative pressure state so that the activated carbon material can be transferred between the iodine adsorber 1, the silo 31 and the barrel 2.

[0030] Specifically, in an embodiment of the present invention, the silo 31 is used to store activated carbon, that is, to store the discarded activated carbon or newly filled activated carbon from the iodine adsorber 1. The filter module 32 used for purification inside the activated carbon replacement system device of the iodine adsorber 1 is used to purify and filter the dust of the activated carbon replacement device of the iodine adsorber 1 during operation, so that the system is always kept clean, dust is prevented from entering the inside of the iodine adsorber 1, the dust content in the iodine adsorber 1 is reduced, and the purification efficiency of the iodine adsorber 1 is improved. At the same time, the entire iodine adsorber 1 activated carbon replacement system device forms an air volume circulation system with the iodine adsorber 1, and during the unloading and filling process of the activated carbon, the cleanliness of the air volume in the system is guaranteed, which helps the stable operation of the equipment, and prevents the leakage and diffusion of carbon ash and radioactive aerosols during the operation, and avoids the contamination of the operator. The function of the power module 33 is to enable the activated carbon material to be smoothly transferred between the iodine adsorber 1, the silo 31 and the barrel 2 by adjusting the positive and negative pressures. The power module 33, for example, a compressor fan, is designed through a positive and negative pressure system to provide unloading and loading power for the activated carbon in the iodine adsorber 1. The air volume parameter of the compressor fan in the power module 33 can be 100-500m3 / h. After the system is designed, the unloading negative pressure formed can be 200-600mbar; the loading positive pressure can be 100-300mbar, and the loading negative pressure can be 200-600mbar. In this way, the unloading and loading requirements of the replacement system for the activated carbon in the iodine adsorber 1 can be met.

[0031] More specifically, by using a compression fan of the power module 33, a positive / negative pressure state is generated in the replacement system. For example, the replacement system is adjusted to a negative pressure state, and the negative pressure in the replacement system is used to extract the activated carbon in the iodine adsorber 1 into the waste barrel 2, thereby completing the unloading of the failed activated carbon. Similarly, the replacement system can be adjusted to a negative pressure state, and the new activated carbon can be sucked into the distribution silo 31 by negative pressure, and then the activated carbon can be blown into the iodine adsorber 1 by positive pressure. In this way, by using a set of power modules 33, i.e., a compression fan system, the replacement system can be placed in different air pressure states as needed, and has the functions of unloading and loading activated carbon. The structural design is simple, and multiple sets of fan systems are not required, which meets the working environment requirements of a small space.

[0032] See also Figure 1 and Figure 2 In one embodiment, the silo 31, the filter module 32 and the power module 33 are connected by pipelines, the silo 31 is respectively connected to the discharge end of the barrel 2 and the feed end of the iodine adsorber 1 through pipelines, and the discharge end of the iodine adsorber 1 is connected to the feed end of the barrel 2. The pipelines between the replacement system, the iodine adsorber 1 and the barrel 2 are detachably connected, and the on-off state of each pipeline is controlled by a valve.

[0033] Specifically, new activated carbon or waste activated carbon is stored in the silo 31, and the activated carbon is sent to the iodine adsorber 1 through the pipeline to load the activated carbon, that is, to provide new adsorbent for the iodine adsorber 1, or the waste activated carbon is transferred to the unloading barrel 2 to unload the activated carbon. The filter module 32 is set on the pipeline, for example, using a filter of a corresponding model, and is responsible for cleaning the gas in the connecting pipeline system. The power module 33 provides airflow to drive the activated carbon material to flow in the pipeline, and adjusts the pressure of the airflow as needed to realize the transportation of activated carbon.

[0034] More specifically, quick-connect connectors can be used to realize the disassembly and connection of the pipelines between the replacement system, the iodine adsorber 1 and the barrel 2. At the same time, valves such as ball valves or gate valves can be installed on each pipeline to control the on-off of the pipeline for unloading and loading of the activated carbon in the iodine adsorber 1. That is to say, during the operation of the replacement system, there is a corresponding control module 35 for controlling the operation of the entire replacement system, and the on-off of the valves in the corresponding pipelines is selected as needed to form the required pipeline structure, so that two working modes are operated inside the replacement system through the control module 35, namely, a discharging working mode for forming a negative pressure, and a filling working mode for forming a positive pressure.

[0035] See also Figures 1 to 3 In one embodiment, in the unloading mode of the replacement system, the discharge end of the iodine adsorber 1 is connected to the feed end of the unloading barrel 2, the discharge end of the barrel 2 is connected to the silo 31, the silo 31, the filter module 32 and the power module 33 are connected in sequence, and the power module 33 is also connected to the feed end of the iodine adsorber 1; the power module 33 provides negative pressure to the connected barrel 2 and positive pressure to the connected iodine adsorber 1 through the silo 31 to transfer the activated carbon material in the iodine adsorber 1 to the barrel 2.

[0036] Specifically, in the embodiment of the present invention, when the purification efficiency of the activated carbon in the iodine adsorber 1 is reduced after detection and cannot meet the purification and filtration requirements of the nuclear air environment, the activated carbon in the iodine adsorber 1 needs to be replaced to ensure the purification efficiency of the iodine adsorber 1. That is, the activated carbon in the iodine adsorber 1 is first unloaded, that is, the iodine adsorber 1, the unloading barrel 2, and the activated carbon replacement system of the iodine adsorber 1 are connected through a connecting pipeline; then the positive / negative pressure system is formed inside the device by using the exhaust and air supply of the power module 33; then, the activated carbon in the iodine adsorber 1 is pumped into the unloading barrel 2 by replacing the negative pressure inside the system, and the activated carbon particles fall into the barrel 2, and the dust enters the purification and filtration module 32 with the negative pressure; finally, the purified air is sent into the iodine adsorber 1 after passing through the power module 33; and the unloading of the activated carbon in the iodine adsorber 1 is completed.

[0037] See also Figures 1 to 3In one embodiment, in the filling mode of the replacement system, the discharge end of the barrel 2 filled with activated carbon material is connected to the silo 31, the silo 31, the filter module 32 and the power module 33 are connected in sequence, and the power module 33 is also connected to the feed end of the iodine adsorber 1 through the silo 31; the power module 33 provides negative pressure to the connected silo 31 to extract the activated carbon material in the barrel 2, and then provides positive pressure to the connected silo 31 to blow the activated carbon material into the iodine adsorber 1.

[0038] Specifically, in an embodiment of the present invention, when it is necessary to fill the activated carbon of the iodine adsorber 1, the iodine adsorber 1, the filling barrel 2, and the activated carbon replacement system device of the iodine adsorber 1 are also connected through a connecting pipeline; then the exhaust and air supply of the power module 33 are used to form a positive / negative pressure system inside the device; then, by changing the negative pressure inside the system, the activated carbon in the filling barrel 2 is pumped into the silo 31, the activated carbon particles remain in the silo 31, and the dust enters the purification and filtration module 32 with the negative pressure; the purified air is returned to the silo 31 after passing through the power module 33, and the activated carbon in the silo 31 is sent to the iodine adsorber 1 under the action of aerodynamics; finally, the filling of the activated carbon of the iodine adsorber 1 is completed.

[0039] See also Figures 1 to 3 In one embodiment, a booster module 34 is further included. The booster module 34 is connected to the silo 31 through a pipeline, and in the filling mode of the replacement system, the booster module 34 is connected to the feed end of the iodine adsorber 1 through the silo 31 together with the power module 33. A distribution module is also included, and the distribution module is used to control the amount of activated carbon material blown in the pipeline in the filling mode.

[0040] Specifically, in an embodiment of the present invention, the air volume boosting module 34, i.e., an additional compression fan, provides power to increase the activated carbon filling height and lift during the activated carbon filling process. Through frequency conversion regulation, it is suitable for the filling needs of different scenarios and meets the filling requirements of iodine adsorbers 1 of different models and sizes. The air volume parameter of the air volume boosting module 34 is 50-150m3 / h. In other words, when it is found during the filling process that the lift of the activated carbon delivered to the iodine adsorber 1 is small and cannot meet the filling requirements of the iodine adsorber 1, the air volume boosting module 34 is started to supplement the power air volume, increase the activated carbon filling lift, and transport the activated carbon material to the iodine adsorber 1 to ensure that the filling of the activated carbon in the iodine adsorber 1 is completed.

[0041] More specifically, a distribution module can also be set in the area of ​​the pipeline connected to the silo 31, for example, by adjusting the opening of the valve to control the amount of activated carbon material transported, so as to achieve equal distribution of the loaded activated carbon, and play a role in distributing the activated carbon material during the activated carbon filling process, so as to avoid blockage caused by uneven material transportation resulting from material accumulation in the silo 31 or the pipeline, thereby affecting the activated carbon replacement efficiency of the iodine adsorber 1.

[0042] See also Figure 4 The present invention also provides a method for replacing activated carbon in an iodine adsorber, comprising:

[0043] Determine whether to execute the activated carbon unloading mode or the activated carbon filling mode according to the operating state of the iodine adsorber 1;

[0044] Based on the activated carbon unloading mode, negative pressure is formed in the replacement system connected to the iodine adsorber 1, and the activated carbon in the iodine adsorber 1 is extracted and unloaded;

[0045] Based on the activated carbon filling mode, a positive pressure is formed in the replacement system connected to the iodine adsorber 1 , and the activated carbon in the silo 31 is blown and filled into the iodine adsorber 1 .

[0046] Specifically, in an embodiment of the present invention, by using a compression blower, a positive / negative pressure is generated in the replacement system, the replacement system is adjusted to a negative pressure state, and the negative pressure in the system is used to extract the activated carbon in the iodine adsorber 1 into the waste bucket 2, and the unloading of the failed activated carbon is completed. When the replacement system is adjusted to a positive / negative pressure state, the new activated carbon is sucked into the distribution barrel 2 by the negative pressure, and then the activated carbon is blown into the iodine adsorber 1 by the positive pressure to complete the loading of the updated activated carbon. Using this replacement method, a set of compression blower system is used, and the corresponding device structure design is carried out through the connected pipeline system. According to needs, the system is placed in different air pressure states, and has the functions of unloading and loading activated carbon, so that the structural design of running this replacement method is simple, does not require multiple sets of blower systems, and meets the working environment of a small space.

[0047] In one embodiment, in the step of executing the activated carbon unloading mode or the activated carbon filling mode, it also includes starting the purification and filtering module 32 based on the purification circulation loop formed between the iodine adsorber 1, the replacement system and the barrel 2. In the step of executing the activated carbon filling mode, it also includes determining whether to start the air volume boosting module 34 based on the model size of the iodine adsorber 1.

[0048] Specifically, the filter module 32 provided inside the replacement system device is used to purify and filter the dust in the operation process of the activated carbon replacement system of the iodine adsorber 1, so that the replacement system is always kept clean, dust is prevented from entering the iodine adsorber 1, the dust content in the iodine adsorber 1 is reduced, and the purification efficiency of the iodine adsorber 1 is ensured. The air volume booster module 34 provided inside the replacement system device is used to adjust the air volume when the iodine adsorber 1 is unloaded and loaded with activated carbon, so as to meet the replacement requirements of activated carbon in iodine adsorbers 1 of different models and sizes.

[0049] In summary, the present invention provides an iodine adsorber activated carbon replacement system and replacement method, by making the entire replacement system have positive / negative pressure functions under different control loops formed, and using the positive / negative pressure in the replacement system to complete the loading and unloading of the activated carbon in the iodine adsorber. At the same time, a filtering and purification module is used to complete the filtering and purification of activated carbon smoke in the system to ensure the cleanliness of the pipeline system; an adjustable air volume booster module is used to adjust the head during the activated carbon filling process to meet the filling requirements of iodine adsorber carbon beds of different specifications and models; and an activated carbon distribution module is used to achieve equal distribution of the filled activated carbon to avoid the aggregation and accumulation of activated carbon. The unloading of failed activated carbon and the updating of activated carbon filling in the iodine adsorber are realized, so that the iodine adsorber always maintains a high purification and filtration efficiency.

[0050] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An iodine adsorber activated carbon replacement system, characterized in that: The replacement system is connected to the iodine adsorber (1) and the material barrel (2) through pipelines, and the replacement system comprises: A silo (31), wherein the silo (31) is used to store the activated carbon material in the iodine adsorber (1) or the barrel (2); A filter module (32), the filter module (32) being used to filter dust and impurities in the pipeline; and A power module (33), wherein the power module (33) is used to adjust the replacement system to a positive / negative pressure state so that the activated carbon material can be transferred between the iodine adsorber (1), the silo (31) and the barrel (2).

2. The replacement system according to claim 1, characterized in that: The silo (31), the filter module (32) and the power module (33) are connected via pipelines; the silo (31) is respectively connected to the discharge end of the barrel (2) and the feed end of the iodine adsorber (1) via pipelines; the discharge end of the iodine adsorber (1) is connected to the feed end of the barrel (2).

3. The replacement system according to claim 2, characterized in that: The pipelines between the replacement system, the iodine adsorber (1) and the material barrel (2) are detachably connected, and the on-off state of each pipeline is controlled by a valve.

4. The replacement system according to claim 3, characterized in that: In the unloading mode of the replacement system, the discharge end of the iodine adsorber (1) is connected to the feed end of the material barrel (2) for unloading, the discharge end of the material barrel (2) is connected to the silo (31), the silo (31), the filter module (32) and the power module (33) are connected in sequence, and the power module (33) is also connected to the feed end of the iodine adsorber (1); the power module (33) provides negative pressure to the connected material barrel (2) and positive pressure to the connected iodine adsorber (1) through the silo (31), so as to transfer the activated carbon material in the iodine adsorber (1) to the material barrel (2).

5. The replacement system according to claim 3, characterized in that: In the filling mode of the replacement system, the discharge end of the material barrel (2) filled with activated carbon material is connected to the material bin (31), the material bin (31), the filter module (32) and the power module (33) are connected in sequence, and the power module (33) is also connected to the feed end of the iodine adsorber (1) through the material bin (31); the power module (33) provides negative pressure to the connected material bin (31) to extract the activated carbon material in the material barrel (2), and then provides positive pressure to the connected material bin (31) to blow the activated carbon material into the iodine adsorber (1).

6. The replacement system according to claim 5, characterized in that: It also includes a booster module (34), which is connected to the silo (31) through a pipeline, and in the filling mode of the replacement system, is connected to the feed end of the iodine adsorber (1) through the silo (31) together with the power module (33).

7. The replacement system according to claim 5, characterized in that: It also includes a distribution module, which is used to control the amount of activated carbon material blown into the pipeline in the filling mode.

8. A method for replacing activated carbon in an iodine adsorber, characterized in that: include: Determining whether to execute an activated carbon unloading mode or an activated carbon loading mode according to the operating state of the iodine adsorber (1); Based on the activated carbon unloading mode, a negative pressure is formed in the replacement system connected to the iodine adsorber (1), and the activated carbon in the iodine adsorber (1) is extracted and unloaded; Based on the activated carbon filling mode, a positive pressure is formed in the replacement system connected to the iodine adsorber (1), and the activated carbon in the silo (31) is blown and filled into the iodine adsorber (1).

9. The replacement method according to claim 8, characterized in that: The step of executing the activated carbon unloading mode or the activated carbon filling mode also includes: starting the purification filter module (32) based on the purification circulation loop formed between the iodine adsorber (1), the replacement system and the barrel (2).

10. The replacement method according to claim 8, characterized in that: The step of executing the activated carbon filling mode also includes: determining whether to start the air volume boosting module (34) based on the model size of the iodine adsorber (1).

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