CN107413187A - A kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device and method - Google Patents
A kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device and method Download PDFInfo
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- CN107413187A CN107413187A CN201710807946.2A CN201710807946A CN107413187A CN 107413187 A CN107413187 A CN 107413187A CN 201710807946 A CN201710807946 A CN 201710807946A CN 107413187 A CN107413187 A CN 107413187A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/485—Sulfur compounds containing only one sulfur compound other than sulfur oxides or hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/106—Silica or silicates
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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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/30—Capture or disposal of greenhouse gases of perfluorocarbons [PFC], hydrofluorocarbons [HFC] or sulfur hexafluoride [SF6]
Abstract
The present invention discloses a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device, it is characterised in that it includes pressure monitoring module, three-way change-over valve, straight-through valve group, supercharging valve group, high vacuum valve group, chemical processing device, equipment for separation of gases and pressure recovery device；Sulfur hexafluoride/nitrogen mixed gas air chamber connects the entrance of three-way change-over valve by pressure monitoring module, the first outlet of three-way change-over valve connects the entrance of equipment for separation of gases by being pressurized valve group, the second outlet of three-way change-over valve connects the entrance of equipment for separation of gases by leading directly to valve group, and the 3rd outlet of three-way change-over valve connects the entrance of equipment for separation of gases by high vacuum valve group；The outlet of equipment for separation of gases is sequentially connected chemical processing device and pressure recovery device.Whole separation and recovery process whole process No leakage, can recycle and reuse SF again6Gas, both meet environmental requirement, production cost can be reduced again.
Description
Technical field
The invention belongs to gas recovery techniques field, more particularly to a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas point
From retracting device and method.
Background technology
SF6Gas is the insulating gas for uniquely obtaining commercial Application so far because of its excellent insulation and arc extinction performance,
Have been widely used for breaker, fully closed combined electric unit (GIS), power transformer, direct current transportation reversal valve and Current Mutual Inductance
In the equipment such as device.But SF6Gas is strong greenhouse gases, and its global warming coefficient is about carbon dioxide (CO2) 23900
Times, once leakage can produce pollution lasting for a long time to environment, global range is interior to SF6The limitation that gas uses is more and more tighter
Lattice, it is substituted, decrement use is trend of the times.
In SF6Middle addition N2、CO2Or the common gases such as air form binary mixture and show many superiority.Mesh
Before, only sulfur hexafluoride/nitrogen mixed gas has obtained certain applications in practice in engineering, but is limited only to gas-insulated metal
The bus air chamber of closed power transmission line (GIL) and GIS device.
At present, the research for sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device is less, there is not yet engineer applied
Report.The separation and recovery effect of mixed gas not only influences the generating run cost of power equipment, more directly affects environment,
Once being revealed during separation and recovery, influence lasting for a long time can be produced to environment.Meanwhile the recycling of mixed gas
SF can effectively be reduced6Production dosage and production cost.Therefore, research and develop sulfur hexafluoride/nitrogen and mix gas separation and recovery
Device, existing real active demand, there is technological challenge again, significant.
The content of the invention
It is an object of the invention to provide a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device and side
Method, to solve above-mentioned technical problem.Apparatus of the present invention are separated using molecular sieve adsorption material, are a kind of environmentally friendly dresses
Put.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device, including pressure monitoring module, threeway conversion
Valve, straight-through valve group, supercharging valve group, high vacuum valve group, equipment for separation of gases, emptier, chemical processing device and compression
Retracting device；Sulfur hexafluoride/nitrogen mixed gas air chamber connects the entrance of three-way change-over valve by pressure monitoring module, and threeway turns
The first outlet for changing valve connects the entrance of equipment for separation of gases by being pressurized valve group, and the second outlet of three-way change-over valve passes through
The entrance of straight-through valve group connection equipment for separation of gases, the 3rd outlet of three-way change-over valve pass through the connection mixing of high vacuum valve group
The entrance of gas fractionation unit；The outlet connection bilateral switching valve of equipment for separation of gases, the first outlet of bilateral switching valve
Emptier is connected by vavuum pump, the second outlet of bilateral switching valve is sequentially connected chemical processing device and pressure recovery dress
Put.
Further, pressure monitoring module is air gauge or baroceptor, and sulfur hexafluoride/nitrogen mixed gas air chamber leads to
Cross the entrance of pipeline connection three-way change-over valve；Pipeline between mixed gas air chamber and the entrance of three-way change-over valve is provided with first
Magnetic valve and air gauge；Being pressurized valve group includes the oil-free booster pump and second solenoid valve of series connection；Straight-through valve group includes subtracting for series connection
Pressure valve and the 3rd magnetic valve；High vacuum valve group includes the high-vacuum pump and the 4th magnetic valve of series connection；Equipment for separation of gases bag
Include the 5th magnetic valve and separator of series connection；Pressure recovery device includes the 6th magnetic valve, compressor and storage dress of series connection
Put.
Further, separator is filled with the molecular sieve adsorption material for absorption nitrogen, can by pressure swing adsorption method
To complete the utilization of the circulating repetition of molecular screen material.
Further, chemical processing device is used to filter SF6Decomposition gas.
A kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separation and recovery method, including：First, according to pressure monitoring mould
The mixture pressure that block monitors, different gas circuits is selected by three-way change-over valve, the mixed gas of different pressures is carried out
Different processing：As mixture pressure P>During A bar, straight-through valve group is selected；After by straight-through valve group, mixed gas is depressurized
It is sent into separator；As pressure 0.1bar<P<During A bar, selection supercharging valve group, after mixed gas is pressurized, separation dress is sent into
Put；As pressure P<During 0.1bar, high vacuum valve group is selected with three-way change-over valve, sulfur hexafluoride/nitrogen mixed gas air chamber is entered
Row vacuumize process, sulfur hexafluoride/nitrogen mixed gas air chamber is evacuated to 10-4~10-3Mbar, then by mixed gas
It is sent into separator；In separator, the N in mixed gas2Component is by the molecular screen material adsorption filtration in device, and SF6
Component then passes through separator without absorption；In emptier, after molecular screen material is by vacuum pump pressure, it can be inhaled
Attached nitrogen desorption, is then emptied nitrogen, ensures that the circulating repetition of molecular sieve adsorption material utilizes.Then after separating
SF6Gas passes through chemical processing device；Chemical processing device is to SF that may be present6Decomposition gas carries out filtration treatment, finally mistake
SF after filter6Compressed and stored by pressure recovery device.
Further, A=3.
Relative to prior art, present invention evidence has following beneficial effect：
Whole separation and recovery process whole process No leakage of the invention, can recycle and reuse SF again6Gas, both meet environmental protection
It is required that production cost can be reduced again, and package unit cost is relatively low, possesses good promotion prospect and use value.
Apparatus of the present invention can pass through recyclable recycling according to the actual requirements to high voltage electric equipment mixed gas
Molecular sieve adsorption material is separated, then by SF6It is compressed recovery.
Apparatus of the present invention ensure each gas circuit gas confinement No leakage, mixed gas is mixed using complete built-in relief valves designs
Close gas air chamber and pressure monitoring device and use standard interface, three-way change-over valve end outfit standard interface module, it is convenient and
The connection on straight-through valve road, pressure charging valve road or high vacuum valve way solenoid valve.
Apparatus of the present invention include pressure monitoring device, the mixed gas that three-way change-over valve monitors according to pressure monitoring device
Different pressures, select different valve roads to handle mixed gas, be finally compressed recovery.
High vacuum module of the present invention can carry out vacuumize process to mixed gas mixed gas air chamber and main line, prevent
The leakage of residual gas and the influence to follow-up work.
The present invention, can be by SF that may be present in mixed gas by biochemical processing module6Decomposition gas is filtered,
Finally it is compressed recovery.
Mixed gas separating and reclaiming device of the invention whole using complete built-in relief valves designs, ensure each gas circuit closing,
No leakage, mixed gas are separated by resin adsorption material, and whole separating and reclaiming device is a kind of environment-friendly type device.Each gas
Room and each magnetic valve outfit standard interface module, facilitate the connection of each mixed gas gas circuit.
Brief description of the drawings
Fig. 1 is a kind of system pie graph of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device of the present invention；
Fig. 2 is a kind of structural representation of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device of the present invention.
Embodiment
Refer to shown in Fig. 1, a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device of the present invention, including
Pressure monitoring module, three-way change-over valve, straight-through valve group, supercharging valve group, high vacuum valve group, equipment for separation of gases, emptying dress
Put, chemical processing device and pressure recovery device.
Mixed gas air chamber connects the entrance of three-way change-over valve, the first outlet of three-way change-over valve by pressure monitoring module
The entrance of equipment for separation of gases is connected by being pressurized valve group, the second outlet of three-way change-over valve is mixed by straight-through valve group connection
The entrance of gas fractionation unit is closed, the 3rd outlet of three-way change-over valve connects equipment for separation of gases by high vacuum valve group
Entrance；The outlet connection bilateral switching valve of equipment for separation of gases, the first outlet of bilateral switching valve are connected by vavuum pump
Emptier, the second outlet of bilateral switching valve are sequentially connected chemical processing device and pressure recovery device.
Refer to shown in Fig. 2, pressure monitoring module 3 is air gauge or baroceptor, and mixed gas air chamber 1 passes through pipeline
Connect the entrance of three-way change-over valve 4；Pipeline between the entrance of mixed gas air chamber 1 and three-way change-over valve 4 is provided with the first electricity
Magnet valve 2 and air gauge 3.Being pressurized valve group includes the oil-free booster pump 5 and second solenoid valve 6 of series connection；Straight-through valve group includes series connection
The magnetic valve 8 of pressure-reducing valve 7 and the 3rd；High vacuum valve group includes the magnetic valve 10 of high-vacuum pump 9 and the 4th of series connection；Mixed gas separates
Device includes the 5th magnetic valve 11 and separator 12 of series connection；Emptier and chemical processing device 16 pass through bilateral switching valve
13 are connected with separator 12；Emptier includes vavuum pump 14 and emptier 15；SF6Aerochemistry processing unit includes changing
Learn processing unit 17；Pressure recovery device includes the 6th magnetic valve 17, compressor 18 and the storage device 19 of series connection.
A kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separation and recovery method of the present invention, comprises the following steps：Beat first
The first magnetic valve 2 is driven, the mixture pressure monitored according to pressure monitoring module 3, is selected by three-way change-over valve 4 different
Gas circuit, different processing is carried out to the mixed gas of different pressures：As mixture pressure P>During A bar (A=3), selection is straight
Port valve group, the magnetic valve 8 of pressure-reducing valve 7 and the 3rd is opened, close the magnetic valve 10 of second solenoid valve 6 and the 4th；By leading directly to valve group
Mixed gas is decompressed to after A bar and is sent into separator 12 by the 5th magnetic valve 11 by pressure-reducing valve 7, by separator 12
Molecular sieve adsorption material to mixed gas carry out separating treatment, absorb mixed gas in N2；As pressure 0.1bar<P<A
During bar, selection supercharging valve group, after mixed gas is pressurized into A bar by oil-free booster pump 5, sent by the 5th magnetic valve 11
Enter separator 12 to be handled；As pressure P<During 0.1bar, show that most of mixed gas of mixed gas air chamber 1 has been located
Reason terminates, only surplus residual gas, high vacuum valve group is selected with three-way change-over valve 4, by high-vacuum pump 9 to mixed gas air chamber 1
Vacuumize process is carried out, mixed gas air chamber is evacuated to 10-4~10-3Mbar, mixed gas is then passed through into the 5th electromagnetism
Valve 11 is sent into separator 12 and handled.In separator 12, the N in mixed gas2Component is by the molecular sieve in device
Material adsorption filtration, and SF6Component then passes through separator 12 without absorption.The outlet connection bilateral switching valve of separator 12
13, the first outlet connection emptier of bilateral switching valve, in emptier, molecular screen material is depressurized by vavuum pump 14
Afterwards, the nitrogen desorption that can be adsorbed, then nitrogen is emptied, ensure molecular sieve adsorption material by emptier 15
Circulating repetition utilize.The second outlet connection chemical processing device 16 of bilateral switching valve 13, the SF after separation6Passing through of gas
Processing unit is learned, to SF wherein that may be present6Decomposition gas, advanced water-filling is washed and then carries out alkali cleaning, then processing is dried,
By filtration treatment, finally by the 6th magnetic valve 17, the gas compression after filtering is recycled to by storage dress by compressor 18
Put 19.
Pass through the SF after the present apparatus and method separation and recovery6Gas, if after single treatment, SF6Gas purity is not up to
Recovery requires, can repeatedly be handled, until SF6Gas purity meets that recovery requires.
Claims (6)
1. a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device, it is characterised in that including pressure monitoring mould
Block, three-way change-over valve, straight-through valve group, supercharging valve group, high vacuum valve group, equipment for separation of gases, emptier, chemical treatment
Device and pressure recovery device；
Sulfur hexafluoride/nitrogen mixed gas air chamber connects the entrance of three-way change-over valve, three-way change-over valve by pressure monitoring module
First outlet the entrance of equipment for separation of gases is connected by being pressurized valve group, the second outlet of three-way change-over valve passes through straight-through
Valve group connects the entrance of equipment for separation of gases, and the 3rd outlet of three-way change-over valve connects mixed gas by high vacuum valve group
The entrance of separator；The outlet connection bilateral switching valve of equipment for separation of gases；The first outlet of bilateral switching valve passes through
Vavuum pump connects emptier；The second outlet of bilateral switching valve is sequentially connected chemical processing device and pressure recovery device.
2. a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device according to claim 1, its feature exist
In pressure monitoring module (3) is air gauge or baroceptor, and sulfur hexafluoride/nitrogen mixed gas air chamber is connected by pipeline
The entrance of three-way change-over valve (4)；Pipeline between the entrance of mixed gas air chamber (1) and three-way change-over valve (4) is provided with first
Magnetic valve (2) and air gauge (3)；Being pressurized valve group includes the oil-free booster pump (5) and second solenoid valve (6) of series connection；Straight-through valve group
Pressure-reducing valve (7) and the 3rd magnetic valve (8) including series connection；High vacuum valve group includes the high-vacuum pump (9) and the 4th electromagnetism of series connection
Valve (10)；Equipment for separation of gases includes the 5th magnetic valve (11) and separator (12) of series connection；Emptier and chemistry
Processing unit (16) is connected by bilateral switching valve (13) with separator (12)；Emptier includes vavuum pump (14) and emptying
Device (15)；Pressure recovery device includes the 6th magnetic valve (17), compressor (18) and the storage device (19) of series connection.
3. a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device according to claim 1, its feature exist
In separator (12) is filled with the molecular sieve adsorption material for absorption nitrogen.
4. a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device according to claim 1, its feature exist
In chemical processing device (13) is used to filter SF6Decomposition gas.
5. a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separation and recovery method, it is characterised in that based on Claims 1-4
Any one of a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separating and reclaiming device, including：
First, the mixture pressure monitored according to pressure monitoring module, different gas circuits is selected by three-way change-over valve, it is right
The mixed gas of different pressures carries out different processing：As mixture pressure P>During A bar, straight-through valve group is selected；By straight
Port valve group is sent into separator after mixed gas is depressurized；As pressure 0.1bar<P<During A bar, selection supercharging valve group, it will mix
After gas boosting, separator is sent into；As pressure P<During 0.1bar, high vacuum valve group is selected with three-way change-over valve, to lithium
Sulphur/nitrogen mixed gas air chamber carries out vacuumize process, and sulfur hexafluoride/nitrogen mixed gas air chamber is evacuated into 10-4~10-3Mbar, mixed gas is then sent into separator；In separator, the N in mixed gas2Component is by point in device
Son sieve material adsorption filtration, then desorbs after vacuum pump pressure and discharges, and SF6Component then without absorption is filled by separating
Put；Then the SF after separating6Gas passes through chemical processing device；Chemical processing device is to SF6Decomposition gas that may be present in gas
Body carries out filtration treatment, the SF after finally filtering6Compressed and stored by pressure recovery device.
6. a kind of environment-friendly type sulfur hexafluoride/nitrogen mixed gas separation and recovery method according to claim 5, its feature exist
In A=3.
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| CN201710807946.2A CN107413187B (en) | 2017-09-08 | 2017-09-08 | Environment-friendly sulfur hexafluoride/nitrogen mixed gas separation and recovery device and method |
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Cited By (5)
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| CN109276976A (en) * | 2018-12-05 | 2019-01-29 | 国家电网有限公司 | A kind of recyclable device and method of sulfur hexafluoride and nitrogen mixed gas |
| CN109737305A (en) * | 2019-03-15 | 2019-05-10 | 国网陕西省电力公司电力科学研究院 | A kind of air charging system and its operating method of sulfur hexafluoride and nitrogen mixed gas |
| CN109956457A (en) * | 2019-02-20 | 2019-07-02 | 常州大学 | A kind of novel energy-saving SF6/N2System for separating and purifying |
| CN113092682A (en) * | 2021-04-06 | 2021-07-09 | 广州佰迈起生物科技有限公司 | Gas concentration monitoring method and device |
| CN113915519A (en) * | 2021-10-19 | 2022-01-11 | 国网安徽省电力有限公司电力科学研究院 | Zero-emission anti-deformation ring main unit insulating gas recovery device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109276976A (en) * | 2018-12-05 | 2019-01-29 | 国家电网有限公司 | A kind of recyclable device and method of sulfur hexafluoride and nitrogen mixed gas |
| CN109956457A (en) * | 2019-02-20 | 2019-07-02 | 常州大学 | A kind of novel energy-saving SF6/N2System for separating and purifying |
| CN109737305A (en) * | 2019-03-15 | 2019-05-10 | 国网陕西省电力公司电力科学研究院 | A kind of air charging system and its operating method of sulfur hexafluoride and nitrogen mixed gas |
| CN109737305B (en) * | 2019-03-15 | 2020-12-01 | 国网陕西省电力公司电力科学研究院 | Inflation device for sulfur hexafluoride and nitrogen mixed gas and operation method of inflation device |
| CN113092682A (en) * | 2021-04-06 | 2021-07-09 | 广州佰迈起生物科技有限公司 | Gas concentration monitoring method and device |
| CN113915519A (en) * | 2021-10-19 | 2022-01-11 | 国网安徽省电力有限公司电力科学研究院 | Zero-emission anti-deformation ring main unit insulating gas recovery device and method |
| CN113915519B (en) * | 2021-10-19 | 2022-12-09 | 国网安徽省电力有限公司电力科学研究院 | Zero-emission anti-deformation ring main unit insulation gas recovery device and method |
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| CN107413187B (en) | 2020-09-29 |
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