CN206716635U - A kind of plasma decontamination system for removing the pollution of surface tritium - Google Patents
A kind of plasma decontamination system for removing the pollution of surface tritium Download PDFInfo
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- CN206716635U CN206716635U CN201720523127.0U CN201720523127U CN206716635U CN 206716635 U CN206716635 U CN 206716635U CN 201720523127 U CN201720523127 U CN 201720523127U CN 206716635 U CN206716635 U CN 206716635U
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- decontamination
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- tritium
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Abstract
The utility model discloses a kind of plasma decontamination system for removing the pollution of surface tritium, described method produces plasma using high pressure ionization gas, plasma is selectively reacted using the active component of its high-energy with surface contaminant, it is transformed into that there is volatile compound, it is final pollutant is removed from surface, the tritium level of pollution of object surface to be decontaminated is monitored before and after decontamination, until object surface to be decontaminated reaches the surface contaminant controlling value of setting, realizes and recovers to use again.Meanwhile tail gas filtering caused by decontamination is adsorbed, the tritium catalysis oxidation in tail gas absorbs processing rear discharge up to standard.Surface high efficiency decontamination, on-line monitoring, the recovery that the plasma decontamination system of the present utility model for removing the pollution of surface tritium realizes object to be decontaminated are used again, reduce the diffusion of radioactive pollution, by in confined space automated decontamination, improve operating efficiency, the labor intensity of staff is alleviated, reduces personnel exposure's dosage.
Description
Technical field
The utility model belongs to radiation protection and environmental protection technical field, and in particular to a kind of to remove what surface tritium polluted
Plasma decontamination system.
Background technology
Decontamination to radioactive surface contamination is generally divided into chemical decontamination, physical technology of removing pollution and chemistry according to decontamination method property
Physical bond decontamination.Common chemical decontamination uses chemical solvent（Organic solvent, acid solution, complex solution, salting liquid etc.）Clearly
Wash contaminated surface etc.；Physical method has surface wipes, top layer stripping etc..As technology develops, radioactive pollution decontamination has been applied
The physics and chemical means of various modern, such as ultrasound, plasma, laser.Whether liquid is used according further to decontamination also
It is divided into dry method decontamination and wet method decontamination, dry method decontamination is few compared with secondary waste caused by wet method decontamination, and the more conducively separation of waste is returned
Receive and utilize, plasma decontamination is a kind of emerging physical chemistry dry method decontamination technology, suitable for the contaminated metal zero in surface
The decontamination of part and equipment.Detergency mechanism is：Plasma using its high-energy active component selectively with surface contamination
Thing reacts, and is transformed into having volatile compound, such as fluoride and/or phosphinylidyne based compound, finally makes pollutant from table
Face removes.Generally, on the premise of clean effect same with other conventional wet lay decontamination technologies is kept, the technology produces
Secondary waste it is less.
At present, the use of the article of plasma removal surface contamination is almost civilian cleaning in open source literature report, has few
The use of amount removes60The article of Co pollutions, but in the experiment article of simply research, the device of correlation is not introduced, especially lack
Few plasma decontamination plant to the pollution of radioactivity tritium.Currently, a kind of metal surface radioactivity tritium that removes of development is needed badly to pollute
Plasma decontamination system.
The content of the invention
Technical problem to be solved in the utility model is to provide a kind of plasma decontamination system for removing the pollution of surface tritium
System.
The plasma decontamination system of the present utility model for removing the pollution of surface tritium, is characterized in：Described plasma
Decontamination system include be linked in sequence by gas transmission pipeline plasma system, seal closure, on-Line Monitor Device, filtering
Device, valve, exhaust gas aftertreatment system；Described seal closure is the casing of sealing, and decontamination head, thing to be decontaminated are provided with seal closure
Part, the working gas and plasma system that decontamination head reception plasma system is conveyed by gas transmission pipeline pass through transmission
The electric current of cable transfer, excite generation plasma to draw in decontamination head and act on decontamination working face；Described decontamination head
Decontamination working face be plane, flat down, object to be decontaminated is placed on the lower section of decontamination working face, apart from decontamination working face
Altitude range is 0.5cm~2.0cm；Thermocouple, the temperature of thermocouple measurement object to be decontaminated are also equipped with described seal closure
Degree.
The scope of the slip of described seal closure is 20PaL/s~50PaL/s.
High, low compared with plasma cut, the required effect of the more conventional cleaning machine of described plasma decontamination system power
As a result slightly degraded for surface；
The course of work of described plasma decontamination system is as follows：
A. object to be decontaminated is placed in seal closure；
B. exhaust gas aftertreatment system, valve, filter, thermocouple are opened successively；
C. plasma system is opened, excites generation plasma to draw in decontamination head and acts on decontamination working face,
The tritium pollution decontamination of decontamination object surface is treated, thermocouple measures and records the surface temperature of object to be decontaminated in decontamination process in real time
Degree, obtains object I after the completion of decontamination；
D. object I is taken out, is placed in on-Line Monitor Device, the residual contamination on monitoring object I surface, works as residual contamination
≤40.0Bq/cm2When complete decontamination work, work as residual contamination>40.0Bq/cm2When repeat step a-d until residual contamination≤
40.0Bq/cm2；
E. the escaping gas as caused by working decontamination is transported to filter in gas transmission pipeline, by filter
Filter core and adsorption tower carry out filtering absorption, obtain gas I；
F. Open valve, gas I enter exhaust gas aftertreatment system, and the redox through exhaust gas aftertreatment system is by gas I
The tritium gas of middle carrier band is processed into HTO, and HTO is adsorbed by molecular sieve, and obtained innocuous gas is emitted into air.
Described decontamination head is that single decontamination head or multiple decontamination head integrated arrays form.
Described gas transmission pipeline overall process sealing；Described gas transmission pipeline is stainless steel pipes.
Described working gas is one kind in the mixed gas of compressed air, argon gas or hydrogen and argon gas.
Plasma system is united by high frequency pulse generator, gas and formed into components such as pipeline, connection cables.Work as connection
After power supply, a pulse voltage is produced inside radio-frequency generator, this voltage is transported to the electrode in shower nozzle by connection cables
On, and alternating electric field is formed in nozzle cavity, when the working gas of cleaning passes through this electric field, plasma can be ionized to then
Draw, ultimately form the beam-plasma that can be handled material surface.Removal surface tritium pollution of the present utility model etc.
Gas ions decontamination system produces plasma using ionized gas, and plasma utilizes the active component of its high-energy selectively
Reacted with surface contaminant, be transformed into that there is volatile compound, pollutant is removed from surface.Tritium is polluted
Object to be decontaminated, using plasma decontamination, the front and rear monitoring object surface tritium level of pollution to be decontaminated of decontamination, until to be decontaminated
Object reaches the surface contaminant controlling value of setting, realizes and recovers to use again.Meanwhile tail gas filtering caused by decontamination is adsorbed, tail
Tritium in the gas qualified discharge after catalysis oxidation absorption processing.The plasma decontamination of the present utility model for removing the pollution of surface tritium
Surface high efficiency decontamination, on-line monitoring, the recovery that system realizes object to be decontaminated are used again, reduce the expansion of radioactive pollution
Dissipate, by confined space automated decontamination, improving operating efficiency, alleviating the labor intensity of staff, reduce work
Personnel's exposure dose.
The plasma decontamination system of the present utility model for removing the pollution of surface tritium is applied to the stainless steel to tritium pollution, aluminium
The surfaces such as alloy, tungsten-molybdenum alloy or glass carry out decontamination, and decontamination result shows, by 0.5 hour decontamination time, or during decontamination
Between 15.0 minutes, interruption decontamination twice, detersive efficiency is up to more than 95.0%, and the damage to surface is small.Before and after decontamination
Surface electron-microscope scanning（SEM）Detection finds that the plasma decontamination system of the present utility model for removing the pollution of surface tritium is especially
Small to corrosion, as shown by data, corrosion depth is less than 10.0 μm, has reached after the decontamination of metal surface again extensive
The requirement used again.
Brief description of the drawings
Fig. 1 is the structural representation of the plasma decontamination system of removal surface tritium pollution of the present utility model；
In figure, the seal closure 6. of 4. thermocouple of object 5. to be decontaminated of the decontamination of 1. plasma system 2. first 3. is supervised online
Survey the exhaust gas aftertreatment system of 7. filter of device, 8. valve 9..
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
Embodiment 1
The plasma decontamination system of the present utility model for removing the pollution of surface tritium includes passing through gas transmission pipeline order
Plasma system 1, seal closure 5, on-Line Monitor Device 6, filter 7, valve 8, the exhaust gas aftertreatment system 9 of connection；It is described
Seal closure 5 be the casing of sealing, be provided with that decontamination is first 2, object to be decontaminated 3 in seal closure 5, decontamination first 2 receives plasma
The electric current that the working gas and plasma system 1 that system 1 is conveyed by gas transmission pipeline are conveyed by transmission cable, is going
Excite generation plasma to draw in dirt first 2 to act on decontamination working face；The decontamination working face of described decontamination first 2 is flat
Face, flat down, object 3 to be decontaminated is placed on the lower section of decontamination working face, and the altitude range apart from decontamination working face is 0.5cm
~2.0cm；Thermocouple 4 is also equipped with described seal closure 5, thermocouple 4 measures the temperature of object 3 to be decontaminated；
The scope of the slip of described seal closure 5 is 20PaL/s~50PaL/s；
Described plasma decontamination system power is high compared with general cleaning machine, low compared with plasma cut, required
Exercising result slightly degrade for surface；
Described decontamination first 2 is that single decontamination head or multiple decontamination head integrated arrays form.
Described gas transmission pipeline overall process sealing；Described gas transmission pipeline is stainless steel pipes.
Described working gas is one kind in the mixed gas of compressed air, argon gas or hydrogen and argon gas.
The present embodiment specific work process is as follows：
A. object 3 to be decontaminated is placed in seal closure 5；Object 3 to be decontaminated is placed on the lower section of decontamination working face, goes
Dirt first 2 is single decontamination head；Altitude range apart from decontamination working face is 0.5cm；Working gas is compressed air；
B. exhaust gas aftertreatment system 9, valve 8, filter 7, thermocouple 4 are opened successively；
C. plasma system 1 is opened, excites generation plasma to draw in decontamination first 2 and acts on decontamination working face
On, the tritium pollution decontamination on the surface of decontamination object 3 is treated, thermocouple 4 measures in real time and records object 3 to be decontaminated in decontamination process
Surface temperature, object I is obtained after the completion of decontamination；
D. object I is taken out, is placed in on-Line Monitor Device 6, the residual contamination on monitoring object I surface, works as residual contamination
≤40.0Bq/cm2When complete decontamination work, work as residual contamination>40.0Bq/cm2When repeat step a-d until residual contamination≤
40.0Bq/cm2；
E. the escaping gas as caused by working decontamination is transported to filter 7 in gas transmission pipeline, by filter 7
Filter core and adsorption tower carry out filtering absorption, obtain gas I；
F. Open valve 8, gas I enter exhaust gas aftertreatment system 9, and the redox through exhaust gas aftertreatment system 9 is by gas
The tritium gas carried in body I is processed into HTO, and HTO is adsorbed by molecular sieve, and obtained innocuous gas is emitted into air.
By 0.5 hour decontamination time, or 15.0 minutes decontamination time, twice, detersive efficiency is reachable for interruption decontamination
97.8%, and the damage to surface is small.Detected and found by the SEM surface scans before and after decontamination, removal table of the present utility model
The plasma decontamination system of face tritium pollution is especially small to corrosion, and as shown by data, corrosion depth is less than
10.0 μm, the requirement for recovering to use again has been reached after the decontamination of metal surface.
Embodiment 2
The present embodiment is identical with the structure of embodiment 1, and the main distinction is：Object 3 to be decontaminated is placed on decontamination working face
Lower section, the altitude range apart from decontamination working face is 1.0cm；Decontamination first 2 is 2 decontamination heads, and working gas is argon gas；
By 0.5 hour decontamination time, or 15.0 minutes decontamination time, twice, detersive efficiency is reachable for interruption decontamination
More than 96.2%, and the damage to surface is small.Detected and found by the SEM surface scans before and after decontamination, it is of the present utility model to go
Except surface tritium pollution plasma decontamination system especially to corrosion small, as shown by data, corrosion depth
Less than 10.0 μm, the requirement for recovering to use again has been reached after the decontamination of metal surface.
Embodiment 3
The present embodiment is identical with the structure of embodiment 1, and the main distinction is：Object 3 to be decontaminated is placed on decontamination working face
Lower section, the altitude range apart from decontamination working face is 1.0cm；Decontamination first 2 is 6 decontamination heads, and working gas is argon gas and hydrogen
The mixed gas of gas；
By 0.5 hour decontamination time, or 15.0 minutes decontamination time, twice, detersive efficiency is reachable for interruption decontamination
More than 98.8%, and the damage to surface is small.Detected and found by the SEM surface scans before and after decontamination, it is of the present utility model to go
Except surface tritium pollution plasma decontamination system especially to corrosion small, as shown by data, corrosion depth
Less than 10.0 μm, the requirement for recovering to use again has been reached after the decontamination of metal surface.
The utility model is not limited to above-mentioned embodiment, and person of ordinary skill in the field visualizes from above-mentioned
Hair, without performing creative labour, made a variety of conversion, all falls within the scope of protection of the utility model.
Claims (5)
- A kind of 1. plasma decontamination system for removing the pollution of surface tritium, it is characterised in that：Described plasma decontamination system Including the plasma system being linked in sequence by gas transmission pipeline（1）, seal closure（5）, on-Line Monitor Device（6）, filtering Device（7）, valve（8）, exhaust gas aftertreatment system（9）；Described seal closure（5）For the casing of sealing, seal closure（5）Inside it is provided with Decontamination head（2）, object to be decontaminated（3）, decontamination head（2）Receive plasma system（1）The work conveyed by gas transmission pipeline Make gas and plasma system（1）The electric current conveyed by transmission cable, in decontamination head（2）Generation plasma is inside excited to draw Go out to act on decontamination working face.
- A kind of 2. plasma decontamination system for removing the pollution of surface tritium according to claim 1, it is characterised in that：It is described Decontamination head（2）Formed for single decontamination head or multiple decontamination head integrated arrays.
- A kind of 3. plasma decontamination system for removing the pollution of surface tritium according to claim 1, it is characterised in that：It is described Decontamination head（2）Decontamination working face be plane, flat down, object to be decontaminated（3）It is placed on the lower section of decontamination working face.
- A kind of 4. plasma decontamination system for removing the pollution of surface tritium according to claim 1, it is characterised in that：It is described Decontamination head（2）Decontamination working face and object to be decontaminated（3）The distance between be 0.5cm ~ 2.0cm.
- A kind of 5. plasma decontamination system for removing the pollution of surface tritium according to claim 1, it is characterised in that：It is described Seal closure（5）Inside it is also equipped with thermocouple（4）, for measuring object to be decontaminated（3）Temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720523127.0U CN206716635U (en) | 2017-05-12 | 2017-05-12 | A kind of plasma decontamination system for removing the pollution of surface tritium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720523127.0U CN206716635U (en) | 2017-05-12 | 2017-05-12 | A kind of plasma decontamination system for removing the pollution of surface tritium |
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| CN206716635U true CN206716635U (en) | 2017-12-08 |
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| CN201720523127.0U Expired - Fee Related CN206716635U (en) | 2017-05-12 | 2017-05-12 | A kind of plasma decontamination system for removing the pollution of surface tritium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106944419A (en) * | 2017-05-12 | 2017-07-14 | 中国工程物理研究院核物理与化学研究所 | A kind of plasma decontamination system of removal surface tritium pollution |
| CN111957676A (en) * | 2020-08-14 | 2020-11-20 | 沈阳工业大学 | Laser cleaning online monitoring device and method based on temperature sensing |
-
2017
- 2017-05-12 CN CN201720523127.0U patent/CN206716635U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106944419A (en) * | 2017-05-12 | 2017-07-14 | 中国工程物理研究院核物理与化学研究所 | A kind of plasma decontamination system of removal surface tritium pollution |
| CN111957676A (en) * | 2020-08-14 | 2020-11-20 | 沈阳工业大学 | Laser cleaning online monitoring device and method based on temperature sensing |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171208 Termination date: 20190512 |