CN110097991B - Movable radioactive gas treatment system used under accident condition - Google Patents
Movable radioactive gas treatment system used under accident condition Download PDFInfo
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- CN110097991B CN110097991B CN201810095597.0A CN201810095597A CN110097991B CN 110097991 B CN110097991 B CN 110097991B CN 201810095597 A CN201810095597 A CN 201810095597A CN 110097991 B CN110097991 B CN 110097991B
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- detention
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/02—Treating gases
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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
Abstract
The invention relates to a movable radioactive gas treatment system used under accident conditions, which comprises a primary filtering mechanism and a secondary filtering mechanism which are connected with each other, wherein the primary filtering mechanism comprises an air inlet pipeline, and the air inlet pipeline is connected with an aerosol prefilter, an aerosol high-efficiency filter and an iodine removing unit; the secondary filtering mechanism comprises a drying bed connected with the iodine removing unit through an air inlet pipeline, the air outlet end of the drying bed is connected with one or more detention beds through an air inlet branch pipe, each detention bed is provided with an air inlet end and an air outlet end, the air inlet end of each detention bed is connected with a regeneration loop branch pipe, and each regeneration loop branch pipe is connected with a regeneration loop main pipe. The purifying system is designed to continuously perform air purification and exchange on the personnel residence environment under the accident condition by utilizing the purging regeneration of the residence bed activated carbon, and can realize the graded purification treatment of radioactive aerosol, radioactive iodine and inert gas in the gas.
Description
Technical Field
The invention belongs to the technical field of nuclear industry, and particularly relates to a movable radioactive gas treatment system used under accident conditions.
Background
There may be a risk of large amounts of radioactive iodine, aerosols, inert gases being released into the environment where personnel in the main control room, emergency building, etc. may reside in the event of a nuclear facility accident. In order to ensure the safety of the environment in which the personnel are located and the emergency treatment work of the personnel for as long as possible under the accident condition, the living environment of the personnel needs to be purified. The radioactive aerosol can be filtered and purified by a high-efficiency filter, and the radioactive iodine is adsorbed by a traditional iodine adsorber filled with active carbon. For fission products such as radioactive inert gases Xe and Kr, the prior treatment mainly adopts two modes of pressurized storage decay and active carbon retention decay. The pressurized storage decay process mainly collects and sends the radioactive waste gas such as covering gas, purge exhaust gas, overhaul exhaust gas and the like stored in a container of a loop coolant into a buffer tank, and after the buffer tank reaches a certain pressure, the waste gas is pressurized and conveyed into a decay tank for storage, and the radioactive level of the radioactive waste gas is reduced by storing and decaying short-life nuclides such as Xe, kr and the like. The active carbon detention and decay process mainly utilizes the physical adsorption principle of an active carbon adsorbent to adsorb and detention short-service-life nuclides such as Xe, kr and the like in waste gas, and decay reduces the radioactivity level of the nuclides. The active carbon detention decay process is superior to the pressurized storage decay process from the aspects of system safety, operation convenience, space saving and the like, and a complete purification system for carrying out emergency treatment on radioactive iodine, aerosol and inert gas is required for conveniently purifying the living environment of personnel.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a movable radioactive gas treatment system used under accident conditions.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a movable radioactive gas treatment system used under accident conditions comprises a primary filtering mechanism and a secondary filtering mechanism which are connected with each other, wherein the primary filtering mechanism comprises an air inlet pipeline, and the air inlet pipeline is connected with an aerosol prefilter, an aerosol high-efficiency filter and an iodine removing unit;
the secondary filtering mechanism comprises a drying bed connected with the iodine removing unit through an air inlet pipeline, the air outlet end of the drying bed is connected with the air inlet end of the detention bed through an air inlet branch pipe, the air inlet end of the detention bed is also connected with a regeneration loop pipe, and the air outlet end of the detention bed is connected with an air outlet branch pipe.
Further, the plurality of detention beds are arranged, the air outlet ends and the air inlet ends of the adjacent detention beds are connected through serial pipelines, the air inlet ends of the detention beds are connected with regeneration loop branch pipes, and the regeneration loop branch pipes are connected with a regeneration loop main pipe;
the primary filter mechanism and the secondary filter mechanism can be integrated into two independent modules, the two independent modules are respectively provided with a bracket or a shell, the bracket or the shell is provided with a roller, the fixing and the moving are convenient, the primary filter mechanism and the secondary filter mechanism can be connected through quick connecting pipes, the disassembly and the assembly are convenient at any time, and the two independent modules can be independently used after being separated.
The air outlet end of each detention bed is connected with an air outlet branch pipe, and the air outlet end and the air inlet end of the adjacent detention bed are connected through a series pipeline.
Further, a primary fan is arranged on an air inlet pipeline of the primary filtering mechanism, and a secondary fan is arranged on a main pipe of the regeneration loop.
Further, the air inlet pipeline, each air inlet branch pipe, the regeneration loop branch pipe and the serial pipeline are provided with throttle valves.
Further, each air outlet branch pipe and the serial connection pipe are provided with an air outlet regulating valve.
Further, the iodine removing unit is an iodine adsorber filled with active carbon.
Further, each of the outlet branch pipes and the regeneration loop main pipe are provided with a radioactive substance monitoring system.
Further, the radioactive material monitoring system is a radiometer.
The beneficial effects of the invention are as follows: 1. the method comprises the steps of utilizing the activated carbon of a detention bed to purge and regenerate, and continuously purifying and exchanging air in a personnel residence environment under accident conditions by a designed purification system;
2. the system can realize the graded purification treatment of radioactive aerosol, radioactive iodine and inert gas in the gas;
3. the primary filter mechanism and the secondary filter mechanism can be integrated into two independent modules, the two independent modules are provided with a bracket or a shell, the bracket or the shell is provided with a roller, the fixing and the moving are convenient, the primary filter mechanism and the secondary filter mechanism can be connected through quick connecting pipes, the disassembly and the assembly are convenient at any time, and the two independent modules can be independently used after being separated;
4. the ventilation air quantity purification requirements of different personnel living environments can be met by changing the flow of a system fan, the pre-filter, the high-efficiency filter, the drying bed and the active carbon usage amount of the detention bed;
5. the flow rate of the purified gas is less than 3000m3/h, the efficiency of the high-efficiency filter is more than 99.9%, the efficiency of the iodine adsorber is more than 99%, and the dynamic adsorption coefficient of the detention bed active carbon to Kr is more than 20mL/g.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1, a mobile radioactive gas treatment system used under an accident condition comprises a primary filtering mechanism 1 and a secondary filtering mechanism 2 which are connected with each other, wherein the primary filtering mechanism 1 comprises an air inlet pipeline 11, the air inlet pipeline 11 is connected with an aerosol prefilter 12, an aerosol high-efficiency filter 13 and an iodine removal unit 14, the iodine removal unit 14 is an iodine adsorber filled with active carbon, and a primary fan ZV001 is arranged on the air inlet pipeline.
The secondary filtering mechanism 2 comprises a drying bed 21 connected with the iodine removing unit 14 through an air inlet pipeline, the air outlet end of the drying bed 21 is connected with one or more than one detention beds through an air inlet branch pipe, two detention beds shown in the drawing of the patent are respectively a detention bed E1 and a detention bed E2, the air outlet end of the drying bed 21 is connected with the detention bed E1 through an air inlet branch pipe 22, and the air outlet end of the drying bed 21 is connected with the detention bed E2 through an air inlet branch pipe 23;
the detention bed E1 and the detention bed E2 are provided with an air inlet end and an air outlet end, the air inlet end of each detention bed is connected with a regeneration loop branch pipe, the air inlet end of the detention bed E1 is connected with a regeneration loop branch pipe 24, the air inlet end of the detention bed E2 is connected with a regeneration loop branch pipe 25, the regeneration loop branch pipe 24 and the regeneration loop branch pipe 25 are connected with a regeneration loop main pipe 26, and the regeneration loop main pipe 26 is connected with a secondary fan ZV002.
Further, the air outlet end of each detention bed is connected with an air outlet branch pipe, the detention bed E1 is connected with an air outlet branch pipe 27, the detention bed E2 is connected with an air outlet branch pipe 28, and the air outlet end of the detention bed E1 is connected with the air inlet end of the detention bed E2 through a serial pipeline 29.
The purified gas is required to be detected whether the safety index reaches the standard, and in order to conveniently detect the purified gas, each of the gas outlet branch pipes and the main pipe of the regeneration loop is provided with a radioactive substance monitoring system, wherein the radioactive substance monitoring system is a radioactive measuring instrument, specifically, the gas outlet branch pipe 27 is connected with a radioactive measuring instrument A001, the gas outlet branch pipe 28 is connected with a radioactive measuring instrument A002, and the main pipe of the regeneration loop 26 is connected with a radioactive measuring instrument A003.
In order to ensure that each pipeline can independently exhaust or intake, each pipeline is provided with a corresponding throttle valve, and the throttle valve is specifically as follows with reference to the accompanying drawings:
the valve V001 is arranged on the air inlet pipeline 11, the valve V002 is arranged on the air inlet branch pipe 22, the valve V003 is arranged on the air inlet branch pipe 23, the valve V004 is arranged on the air outlet branch pipe 27, the valve V005 is arranged on the serial pipeline 29, the valve V006 is arranged on the air outlet branch pipe 28, the valve V007 is arranged on the regeneration loop branch pipe 25, the valve V008 is arranged on the regeneration loop branch pipe 24, the valve V009 is arranged at the upstream end of the radioactive measuring instrument A001, the valve V010 is arranged at the upstream end of the radioactive measuring instrument A002, and each valve can control the gas flow in the branch pipeline.
The system mainly comprises two main functions, wherein the first function mainly has the effect of purifying the external gas, and the second function mainly comprises the purification of the indoor gas and the regeneration of the detention bed;
the purifying process is as follows:
closing valves V003, V004, V005, V006 and V008, cutting off pipelines of the valves, opening the pipelines of the valves V001, V002, V003, V009 and V010, starting a fan ZV001, purifying radioactive gas through a prefilter 12, a high-efficiency filter 13 and an iodine removal unit 14, sequentially entering a drying bed, a detention bed E1 and a detention bed E2, and allowing the purified gas to enter a personnel residence space;
(II) Process for regeneration of a retention bed
When the radioactivity monitoring value of the outlet of the detention bed reaches a certain limit value, the air supply fan ZV001 is closed, the valves V002, V005, V007 and V009 are closed, the valves V004 and V008 are opened, the fan ZV002 is started, the gas in the room passes through the valve V004 and the detention bed after being used, the activated carbon in the bed is subjected to inert gas nuclide desorption regeneration, and the regenerated gas is discharged to the external environment after passing through the fan. And stopping the regeneration of the retention bed when the radioactivity monitoring value is lower than a certain value.
The purification process and the detention bed regeneration process of the system are simply described above, wherein the detention beds E1 and E2 can be independently used in parallel or can be used in series, and the valves on the corresponding branch pipelines can be regulated in a specific connection mode.
In the invention, as the primary filter mechanism 1 mainly purifies radioactive iodine and aerosol, the secondary filter mechanism 2 mainly purifies inert gas, the primary filter mechanism 1 and the secondary filter mechanism 2 can be integrated into two independent modules for convenient and targeted purification of gas, the two independent modules are provided with the bracket or the shell, the bracket or the shell is provided with the roller, the bracket or the shell is convenient to fix and move, the primary filter mechanism 1 and the secondary filter mechanism 2 can be connected through the quick connection pipe, the disassembly and the assembly are convenient at any time, and the two independent modules can be independently used after being separated.
The system utilizes the active carbon of the detention bed to purge and regenerate, and the designed purification system continuously performs air purification and exchange on the personnel residence environment under the accident condition; the method can realize the graded purification treatment of radioactive aerosol, radioactive iodine and inert gas in the gas; the ventilation air quantity purification requirements of different personnel living environments can be met by changing the flow of a system fan, the pre-filter, the high-efficiency filter, the drying bed and the active carbon usage amount of the detention bed; the flow rate of the purified gas is less than 3000m3/h, the efficiency of the high-efficiency filter is more than 99.9%, the efficiency of the iodine adsorber is more than 99%, and the dynamic adsorption coefficient of the detention bed active carbon to Kr is more than 20mL/g.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A movable radioactive gas treatment system used under accident conditions comprises a primary filtering mechanism and a secondary filtering mechanism which are connected with each other, and is characterized in that the primary filtering mechanism comprises an air inlet pipeline, wherein the air inlet pipeline is connected with an aerosol prefilter, an aerosol high-efficiency filter and an iodine removing unit;
the secondary filtering mechanism comprises a drying bed connected with the iodine removing unit through an air inlet pipeline, the air outlet end of the drying bed is connected with the air inlet end of the detention bed through an air inlet branch pipe, the air inlet end of the detention bed is also connected with a regeneration loop pipe, and the air outlet end of the detention bed is connected with an air outlet branch pipe;
the primary filter mechanism and the secondary filter mechanism can be integrated into two independent modules, the two independent modules are provided with brackets or shells, the brackets or shells are provided with rollers, the primary filter mechanism and the secondary filter mechanism can be connected through quick connecting pipes, so that the primary filter mechanism and the secondary filter mechanism can be conveniently disassembled and assembled at any time, and the two independent modules can be independently used after being separated;
the plurality of detention beds are arranged, the air outlet ends and the air inlet ends of the adjacent detention beds are connected through serial pipelines, the air inlet ends of the detention beds are connected with regeneration loop branch pipes, the regeneration loop branch pipes are connected with regeneration loop main pipes, the air outlet ends of the detention beds are connected with air outlet branch pipes, air outlet regulating valves are arranged on the air outlet branch pipes and the serial pipelines, and the radioactive substance monitoring systems are arranged on the air outlet branch pipes and the regeneration loop main pipes;
the radioactive gas is purified by an aerosol prefilter, an aerosol high-efficiency filter and an iodine removing unit and then sequentially enters a drying bed and a plurality of detention beds, the purified gas enters a personnel residence space,
when the radioactivity monitoring value of the outlet of the detention bed reaches a certain limit value, the gas in the room passes through the gas outlet branch pipe and the detention bed after use, the activated carbon in the bed carries out inert gas nuclide desorption regeneration, the regeneration gas is discharged to the external environment after passing through the main pipe of the regeneration loop, and when the radioactivity monitoring value is lower than a certain value, the detention bed is stopped from regenerating.
2. The mobile radioactive gas treatment system for use in an accident situation according to claim 1, wherein the primary air intake duct of the primary filtering means is provided with a primary air blower and the main pipe of the regeneration circuit is provided with a secondary air blower.
3. A mobile radioactive gas treatment system for use in an accident situation according to claim 1, wherein the inlet conduit, each inlet manifold, regeneration circuit manifold and series line are provided with throttles.
4. A mobile radioactive gas treatment system for use in an accident situation according to claim 1, wherein the iodine removal unit is an iodine adsorber loaded with activated carbon.
5. A mobile radioactive gas treatment system for use in an accident situation according to claim 1, wherein the radioactive material monitoring system is a radiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810095597.0A CN110097991B (en) | 2018-01-31 | 2018-01-31 | Movable radioactive gas treatment system used under accident condition |
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| CN201810095597.0A CN110097991B (en) | 2018-01-31 | 2018-01-31 | Movable radioactive gas treatment system used under accident condition |
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| CN110097991B true CN110097991B (en) | 2023-07-14 |
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| CN113577974A (en) * | 2021-07-28 | 2021-11-02 | 刘菊红 | Radon removing and purifying method and device |
| CN114883022B (en) * | 2022-05-12 | 2023-06-27 | 华能核能技术研究院有限公司 | High-temperature reactor purification and regeneration waste gas treatment system and method |
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