CN115945170A - Preparation system and method of nuclear-grade activated carbon for trapping airborne radioactive iodine - Google Patents
Preparation system and method of nuclear-grade activated carbon for trapping airborne radioactive iodine Download PDFInfo
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- CN115945170A CN115945170A CN202211664660.0A CN202211664660A CN115945170A CN 115945170 A CN115945170 A CN 115945170A CN 202211664660 A CN202211664660 A CN 202211664660A CN 115945170 A CN115945170 A CN 115945170A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 191
- 238000002360 preparation method Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 29
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 title claims description 20
- 229910052740 iodine Inorganic materials 0.000 title claims description 20
- 239000011630 iodine Substances 0.000 title claims description 20
- 238000001914 filtration Methods 0.000 claims abstract description 31
- 239000007787 solid Substances 0.000 claims abstract description 18
- 238000000746 purification Methods 0.000 claims abstract description 13
- 238000005470 impregnation Methods 0.000 claims abstract description 12
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 43
- 238000005086 pumping Methods 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 17
- 230000033001 locomotion Effects 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000001035 drying Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 239000012071 phase Substances 0.000 description 41
- 238000007598 dipping method Methods 0.000 description 4
- 239000007790 solid phase Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a nuclear-grade activated carbon preparation system and a method for trapping airborne radioactive iodine, wherein the system comprises a gas-phase impregnant preparation module, a nuclear-grade activated carbon preparation module, a gas filtration and purification module and a control module, wherein the nuclear-grade activated carbon preparation module, the gas-phase impregnant preparation module and the gas filtration and purification module are connected through pipelines, and the control module is electrically connected with the gas-phase impregnant preparation module, the nuclear-grade activated carbon preparation module and the gas filtration and purification module; the gas-phase impregnant preparation module heats the solid impregnant to convert the solid impregnant into the gas-phase impregnant, the gas-phase impregnant generated by the gas-phase impregnant preparation module enters the nuclear-grade activated carbon preparation module through a pipeline and is mixed with the activated carbon, and the gas discharged by the nuclear-grade activated carbon preparation module is filtered and purified by the filtering and purifying unit. By adopting the system disclosed by the invention, drying is not needed, the energy consumption and the material loss are effectively reduced, the impregnation amount is accurate and controllable, and the production efficiency is effectively improved.
Description
Technical Field
The invention belongs to the field of nuclear air purification, and particularly relates to a system and a method for preparing nuclear-grade activated carbon for trapping airborne radioactive iodine.
Background
Nuclear-grade activated carbon is mainly used as an adsorbent in ventilation system loops of nuclear power stations at home and abroad so as to ensure effective trapping of airborne radioactive iodine.
The impregnation process is the key of the preparation process of the nuclear-grade activated carbon, at present, the technical route adopted by the preparation of the nuclear-grade activated carbon at home and abroad is basically the same, the modifier is dissolved in solvent water and then is impregnated on the surface of the activated carbon by means of spraying and the like, the impregnated activated carbon has the phenomenon of agglomeration and viscosity, and the activated carbon needs to be dried to ensure that the activated carbon particles are dispersed and the water content reaches the standard. Because the modifier generally has the problem of low melting point, when the drying temperature of the activated carbon is high, the impregnant can volatilize, and the effective loading capacity is reduced; when the drying temperature of the activated carbon is low, the drying time is long, the energy consumption is high, and the production efficiency is greatly influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a method for preparing nuclear-grade activated carbon for trapping airborne radioactive iodine, wherein the conversion of an impregnant from a solid phase to a gas phase is realized through temperature regulation, the microcosmic uniform permeation of impregnant gas is realized by utilizing the physical adsorption capacity of activated carbon, and the in-situ deposition of the impregnant from the gas phase to the solid phase is realized by depending on a cooling process. The dipping process does not need to be dried, effectively reduces energy consumption and material loss, has accurate and controllable dipping amount, and effectively improves production efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: in a first aspect, the system for preparing nuclear-grade activated carbon for trapping airborne radioactive iodine comprises a gas-phase impregnant preparation module, a nuclear-grade activated carbon preparation module, a gas filtration and purification module and a control module, wherein the gas-phase impregnant preparation module is connected with the nuclear-grade activated carbon preparation module through a pipeline, the nuclear-grade activated carbon preparation module is connected with the gas filtration and purification module through a pipeline, and the control module is electrically connected with the gas-phase impregnant preparation module, the nuclear-grade activated carbon preparation module and the gas filtration and purification module;
the gas phase impregnant preparation module is used for heating and converting solid impregnant into corresponding gas phase impregnant, the gas phase impregnant generated by the gas phase impregnant preparation module enters the nuclear-grade activated carbon preparation module through a pipeline and is in mixed contact with activated carbon in the nuclear-grade activated carbon preparation module, and the filtering and purifying unit is used for filtering and purifying gas discharged by the nuclear-grade activated carbon preparation module.
Further, the gas phase impregnant preparation module comprises a solid impregnant and a heating device, and a first air pump, a first air valve and a gas flowmeter are arranged on a pipeline between the gas phase impregnant preparation module and the nuclear-grade activated carbon preparation module.
Further, the nuclear-grade activated carbon preparation module comprises a tank body, a gas ejector and a discharge bin, wherein the gas ejector is arranged in the tank body, and the discharge bin is arranged below the tank body.
Further, the gas injector is connected with the gas-phase impregnant preparation module, and the gas injector is used for uniformly injecting the gas-phase impregnant prepared by the gas-phase impregnant preparation module into the tank body at a certain speed.
Furthermore, a second air valve and a second air pump are arranged on a pipeline between the air filtering and purifying module and the filtering and purifying unit.
Further, the tank body enables the gas phase impregnant to be fully mixed and contacted with the activated carbon through mechanical action.
Further, the tank body has heating and cooling functions, and a temperature sensor and a pressure sensor are arranged in the tank body.
Further, the control module is used for controlling the temperature of the heating device and the tank body, controlling the running states of the first air pump, the second air pump, the first air valve and the second air valve, and monitoring the data of the gas flowmeter
In a second aspect, a method for preparing nuclear-grade activated carbon for trapping airborne radioactive iodine, the method being used for preparing the nuclear-grade activated carbon by using a system for preparing nuclear-grade activated carbon for trapping airborne radioactive iodine according to the first aspect and any optional embodiment of the present invention, and the method comprising the following steps:
s1, filling a predetermined amount of solid impregnant into a high-temperature-resistant and chemically inert open container, and filling an activated carbon substrate into a tank body;
s2, confirming that the first air pump, the second air pump, the first air valve and the second air valve are all in a closed state;
s3, setting the same heat preservation temperature for the heating device and the tank body, setting mechanical motion parameters of the tank body, starting a mechanical motion program of the tank body, and simultaneously starting a heating program of the heating device and the tank body;
s4, the temperature of the tank body and the heating device rises to a set temperature, when the temperature of the tank body is kept warm for a preset time and the internal pressure value of the heating device reaches a preset value, a first air valve and a first air pump are simultaneously opened, gas phase impregnant is pumped into the tank body through a gas ejector, a gas flowmeter monitors the pumping quantity, when the pumping quantity reaches a single pumping quantity, the first air valve and the first air pump are simultaneously closed, the single pumping process is completed, and then gas phase impregnant pumping is carried out according to a set interval time;
s5, after the set pumping times are finished, simultaneously opening the first air valve and the first air pump again, and simultaneously closing the first air valve and the first air pump when the interior of the heating device reaches a first preset vacuum degree;
s6, closing a heating program of the heating device, continuously keeping the temperature of the tank body and the mechanical operation state for a period of time, converting the tank body from a heating mode to a cooling mode, cooling at a preset cooling rate, and stopping a mechanical movement program of the tank body after cooling to the room temperature;
and S7, simultaneously opening the second air valve and the second air pump, pumping out residual air in the tank body, filtering, and simultaneously closing the second air valve and the second air pump when the interior of the tank body reaches a second preset vacuum degree, so that the obtained nuclear-grade activated carbon is discharged from the tank body.
Further, the amount of the solid impregnant in step S1 is calculated based on the mass of the activated carbon and the impregnation ratio.
The invention has the beneficial technical effects that: by adopting the system and the method for preparing the nuclear-grade activated carbon for trapping airborne radioactive iodine, which are disclosed by the invention, a brand-new technical route is adopted, the introduction of a solvent in the traditional wet impregnation process is avoided from the source, the conversion of an impregnant from a solid phase to a gas phase is realized through temperature regulation, the uniform diffusion of impregnant gas to a pore structure is realized by skillfully utilizing the physical adsorption capacity of the activated carbon, and the in-situ deposition of the impregnant from the gas phase to the solid phase is realized by depending on a cooling process. The dipping process does not need to be dried, effectively reduces energy consumption and material loss, has extremely low pollution degree to dipping equipment, and can effectively improve production efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a nuclear-grade activated carbon preparation system for trapping airborne radioactive iodine according to a first embodiment of the present invention;
wherein: 1-heating device, 2-first air pump, 3-first air valve, 4-air flow meter, 5-tank, 6-air ejector, 7-discharging bin, 8-second air valve, 9-second air pump, 10-filtering and purifying unit, and 11-control module.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Example one
As shown in fig. 1, an embodiment of the present invention provides a nuclear-grade activated carbon preparation system for trapping airborne radioactive iodine, including a vapor phase impregnant preparation module, a nuclear-grade activated carbon preparation module, a gas filtration and purification module, and a control module. The gas phase impregnant preparation module is connected with the nuclear-grade activated carbon preparation module through a pipeline, and the nuclear-grade activated carbon preparation module is connected with the gas filtration and purification module through a pipeline. The control module is electrically connected with the gas phase impregnant preparation module, the nuclear-grade activated carbon preparation module and the gas filtration and purification module.
The gas-phase impregnant preparation module is used for heating the solid impregnant to convert the solid impregnant into corresponding gas-phase impregnant, and the gas-phase impregnant generated by the gas-phase impregnant preparation module enters the nuclear-grade activated carbon preparation module through a pipeline and is in mixed contact with the activated carbon in the nuclear-grade activated carbon preparation module. The filtering and purifying unit 10 is used for filtering and purifying the gas discharged from the nuclear-grade activated carbon preparation module.
The gas-phase impregnant preparation module comprises a solid impregnant and a heating device 1, a first air pump 2 is arranged on a pipeline between the gas-phase impregnant preparation module and the nuclear-grade activated carbon preparation module, a first air valve 3 and a gas flowmeter 4 are arranged on the pipeline, the nuclear-grade activated carbon preparation module comprises a tank body 5, a gas ejector 6 and a discharge bin 7, the gas ejector 6 is arranged in the tank body 5, the discharge bin 7 is arranged below the tank body 5, and a second air valve 8 and a second air pump 9 are arranged on the pipeline between the gas filtration purification module and the filtration purification unit 10.
The heating device 1 is used for converting an impregnant which is in a solid state at normal temperature into a corresponding gas-phase substance through heating and temperature rise, and a temperature sensor and a pressure sensor are installed inside the heating device 1.
The first air pump 2 is used for pumping the gas-phase impregnant in the heating device 1 to a gas injector 6 of the nuclear-grade activated carbon preparation module, and the first air valve 3 is used for controlling whether the gas-phase impregnant is delivered into the gas injector 6.
The gas flow meter 4 is used for measuring the delivery amount of the gas-phase impregnant to the gas injector 6, and the tank 5 can improve the mixing contact of the gas-phase impregnant and the activated carbon through mechanical action.
The tank body 5 has heating and cooling functions, and a temperature sensor and a pressure sensor are arranged in the tank body 5.
The gas injector 6 is used for uniformly injecting the gas-phase impregnant prepared by the gas-phase impregnant preparation module into the tank body 5 at a certain speed, and the discharge bin 7 is used for receiving the prepared nuclear-grade activated carbon.
The second gas valve 8 is used for controlling whether the gas in the tank 5 is transmitted to the outside, and the second gas pump 9 is used for pumping the gas in the tank 5 to the filtering and purifying unit 10.
The filtering and purifying unit 10 is used for filtering and purifying the gas discharged by the second air pump 9, and the control module 11 is used for controlling the temperatures of the heating device 1 and the tank body 5, controlling the operating states of the first air pump 2, the second air pump 9, the first air valve 3 and the second air valve 8, and monitoring the data of the gas flow meter 4.
Example two
The embodiment of the invention provides a preparation method of nuclear-grade activated carbon for trapping airborne radioactive iodine, which is based on a preparation system of nuclear-grade activated carbon for trapping airborne radioactive iodine, and comprises the following steps:
s1, weighing a certain amount of solid impregnant, putting the solid impregnant into a high-temperature-resistant and chemically inert open container, and putting the solid impregnant and the container into a heating device 1; filling an activated carbon substrate into the tank body 5;
s2, confirming that the first air pump 2, the second air pump 9, the first air valve 3 and the second air valve 8 are all in a closed state through the control module 11;
s3, inputting the total mass and the pumping times of the impregnant through the control module 11 to obtain the single pumping quantity, setting the pumping interval time, setting the same heat preservation temperature of the heating device 1 and the tank body 5, setting the mechanical motion parameters of the tank body, starting the mechanical motion program of the tank body 5, and simultaneously starting the heating programs of the heating device 1 and the tank body 5;
and S4, raising the temperature of the tank body 5 and the heating device 1 to a set temperature, and when the temperature of the tank body is kept at the set temperature for a preset time and the internal pressure value of the heating device 1 is more than or equal to 0.001MPa, indicating that the tank body 5 and the heating device 1 have the gas-phase impregnation condition. Simultaneously opening the first air valve 3 and the first air pump 2, pumping gas phase impregnant into the tank body 5 through the gas ejector 6, monitoring the pumping amount through the gas flow meter 4, closing the first air valve 3 and the first air pump 2 simultaneously when the pumping amount reaches the single pumping amount, completing the single pumping process, and subsequently pumping the gas phase impregnant according to the set interval time.
S5, after the set pumping times are finished, simultaneously opening the first air valve 3 and the first air pump 2 again, and simultaneously closing the first air valve 3 and the first air pump 2 when the vacuum degree in the heating device 1 is more than or equal to-0.005 Mpa;
s6, the heating program of the heating device 1 is closed through the control module 11, the tank body 5 is switched from the heating mode to the cooling mode after the temperature and the mechanical operation state of the tank body 5 are continuously kept for a period of time, cooling is carried out at a preset cooling rate, and the mechanical movement program of the tank body 5 is stopped after the tank body is cooled to the room temperature.
And S7, simultaneously opening the second air valve 8 and the second air pump 9 through the control module 11, pumping out residual air in the tank body, filtering, and simultaneously closing the second air valve 8 and the second air pump 9 when the vacuum degree in the tank body is more than or equal to-0.0001 Mpa. And discharging the obtained nuclear-grade activated carbon from the tank body, and placing the nuclear-grade activated carbon in a discharge bin 7 for storage.
In the step S1, the weighing mass of the impregnant is calculated according to the mass of the activated carbon and the impregnation proportion, and the impregnation proportion is not more than 20.wt%.
The pumping interval time in step S3 ranges from 10 to 30 seconds.
In the step S3, the heat preservation temperature ranges of the heating device 1 and the tank body 5 are 80-150 ℃.
And step S4, the heat preservation time of the tank body is more than or equal to 30 minutes.
The cooling rate of the tank body in the step S6 is less than or equal to 1 ℃/min.
Through the detection of a weighing method, the effective impregnation rate of the impregnant of the nuclear-grade activated carbon prepared by the preparation method of the nuclear-grade activated carbon for trapping airborne radioactive iodine provided by the embodiment of the invention is more than or equal to 97 percent and is obviously higher than 88 percent of the effective impregnation rate of the impregnant of the traditional wet impregnation method.
In addition, performance test results show that the removal efficiency of the nuclear-grade activated carbon prepared by the method provided by the embodiment of the invention on radioactive elemental iodine is more than or equal to 99.9%, and the removal efficiency of radioactive methyl iodine is more than or equal to 99.8%, which is equivalent to the removal efficiency of the nuclear-grade activated carbon prepared by the traditional wet impregnation method on radioactive iodine. That is to say, on the premise of equivalent purification efficiency, the nuclear-grade activated carbon prepared by the method provided by the embodiment of the invention has higher yield and longer effective service life, and can completely meet the production requirement of the nuclear-grade activated carbon.
According to the nuclear-grade activated carbon preparation system and the method thereof, solid impregnant is heated by the gas-phase impregnant preparation module and is converted into the gas-phase impregnant, the gas-phase impregnant generated by the gas-phase impregnant preparation module enters the nuclear-grade activated carbon preparation module through a pipeline and is mixed with activated carbon, and the gas exhausted by the nuclear-grade activated carbon preparation module is filtered and purified by the filtering and purifying unit.
The method and system of the present invention are not limited to the embodiments described in the detailed description, and those skilled in the art may derive other embodiments according to the technical solutions of the present invention, and the embodiments also belong to the technical innovation scope of the present invention.
Claims (10)
1. A nuclear-grade activated carbon preparation system for trapping airborne radioactive iodine is characterized in that: the system comprises a gas-phase impregnant preparation module, a nuclear-grade activated carbon preparation module, a gas filtration and purification module and a control module, wherein the gas-phase impregnant preparation module is connected with the nuclear-grade activated carbon preparation module through a pipeline;
the gas phase impregnant preparation module is used for heating and converting solid impregnant into corresponding gas phase impregnant, the gas phase impregnant generated by the gas phase impregnant preparation module enters the nuclear-grade activated carbon preparation module through a pipeline and is in mixed contact with activated carbon in the nuclear-grade activated carbon preparation module, and the filtering and purifying unit is used for filtering and purifying gas discharged by the nuclear-grade activated carbon preparation module.
2. A nuclear-grade activated carbon preparation system for trapping airborne radioactive iodine as claimed in claim 1, wherein: the gas-phase impregnant preparation module comprises a solid impregnant and a heating device, and a first air pump, a first air valve and a gas flowmeter are arranged on a pipeline between the gas-phase impregnant preparation module and the nuclear-grade activated carbon preparation module.
3. A system for preparing nuclear grade activated carbon for trapping airborne radioactive iodine according to claim 2, wherein: the nuclear-grade activated carbon preparation module comprises a tank body, a gas ejector and a discharge bin, wherein the gas ejector is arranged in the tank body, and the discharge bin is arranged below the tank body.
4. A system for preparing nuclear grade activated carbon for trapping airborne radioactive iodine according to claim 3, wherein: the gas injector is connected with the gas-phase impregnant preparation module and is used for uniformly injecting the gas-phase impregnant prepared by the gas-phase impregnant preparation module into the tank body at a certain speed.
5. The system for preparing the nuclear-grade activated carbon for trapping airborne radioactive iodine according to claim 4, wherein: and a second air valve and a second air pump are arranged on a pipeline between the air filtering and purifying module and the filtering and purifying unit.
6. The system for preparing the nuclear-grade activated carbon for trapping airborne radioactive iodine according to claim 5, wherein: the tank body enables the gas phase impregnant to be fully mixed and contacted with the active carbon through mechanical action.
7. The system for preparing nuclear-grade activated carbon for trapping airborne radioactive iodine according to claim 6, wherein: the jar body has heating and cooling function, jar body internally mounted has temperature sensor and pressure sensor.
8. A system for preparing nuclear grade activated carbon for trapping airborne radioactive iodine according to claim 7, wherein: the control module is used for controlling the temperatures of the heating device and the tank body, controlling the running states of the first air pump, the second air pump, the first air valve and the second air valve, and monitoring the data of the gas flow meter.
9. A method for preparing nuclear grade activated carbon for trapping airborne radioactive iodine, which adopts a nuclear grade activated carbon preparation system for trapping airborne radioactive iodine as claimed in any one of claims 1-8 to prepare nuclear grade activated carbon, and the method comprises the following steps:
s1, filling a predetermined amount of solid impregnant into a high-temperature-resistant and chemically inert open container, and filling an activated carbon substrate into a tank body;
s2, confirming that the first air pump, the second air pump, the first air valve and the second air valve are all in a closed state;
s3, setting the same heat preservation temperature for the heating device and the tank body, setting mechanical motion parameters of the tank body, starting a mechanical motion program of the tank body, and simultaneously starting a heating program of the heating device and the tank body;
s4, raising the temperature of the tank body and the heating device to a set temperature, simultaneously opening a first air valve and a first air pump when the temperature of the tank body and the heating device are kept warm for a preset time and the internal pressure value of the heating device reaches a preset value, pumping gas-phase impregnant into the tank body through a gas ejector, monitoring the pumping quantity through a gas flowmeter, simultaneously closing the first air valve and the first air pump when the pumping quantity reaches a single pumping quantity, completing the single pumping process, and subsequently pumping the gas-phase impregnant according to a set interval time;
s5, after the set pumping times are finished, simultaneously opening the first air valve and the first air pump again, and simultaneously closing the first air valve and the first air pump when the interior of the heating device reaches a first preset vacuum degree;
s6, closing a heating program of the heating device, continuously keeping the temperature of the tank body and the mechanical operation state for a period of time, converting the heating mode of the tank body into a cooling mode, cooling at a preset cooling rate, and stopping a mechanical movement program of the tank body after cooling to the room temperature;
and S7, simultaneously opening the second air valve and the second air pump, pumping out residual air in the tank body, filtering, and simultaneously closing the second air valve and the second air pump when the interior of the tank body reaches a second preset vacuum degree, so that the obtained nuclear-grade activated carbon is discharged from the tank body.
10. The method for preparing the nuclear-grade activated carbon for trapping the airborne radioactive iodine according to claim 9, wherein the method comprises the following steps: and (3) calculating the amount of the solid impregnant in the step S1 according to the mass of the activated carbon and the impregnation ratio.
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