CN108101006B - SF (sulfur hexafluoride)6And N2Device and method for rapidly recovering and treating mixed gas - Google Patents
SF (sulfur hexafluoride)6And N2Device and method for rapidly recovering and treating mixed gas Download PDFInfo
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- CN108101006B CN108101006B CN201711381517.XA CN201711381517A CN108101006B CN 108101006 B CN108101006 B CN 108101006B CN 201711381517 A CN201711381517 A CN 201711381517A CN 108101006 B CN108101006 B CN 108101006B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910018503 SF6 Inorganic materials 0.000 title claims description 110
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims description 17
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims description 17
- 239000007789 gas Substances 0.000 claims abstract description 272
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 110
- 238000000926 separation method Methods 0.000 claims abstract description 63
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 53
- 238000000746 purification Methods 0.000 claims abstract description 46
- 238000011084 recovery Methods 0.000 claims abstract description 46
- 238000009833 condensation Methods 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 24
- 230000005494 condensation Effects 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000007906 compression Methods 0.000 claims abstract description 11
- 238000009924 canning Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 105
- 239000012528 membrane Substances 0.000 claims description 33
- 239000012510 hollow fiber Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 6
- 239000002808 molecular sieve Substances 0.000 claims description 6
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 5
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 abstract description 8
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229920005597 polymer membrane Polymers 0.000 abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000005431 greenhouse gas Substances 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/45—Compounds containing sulfur and halogen, with or without oxygen
- C01B17/4507—Compounds containing sulfur and halogen, with or without oxygen containing sulfur and halogen only
- C01B17/4515—Compounds containing sulfur and halogen, with or without oxygen containing sulfur and halogen only containing sulfur and fluorine only
- C01B17/453—Sulfur hexafluoride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/04—Purification or separation of nitrogen
- C01B21/0405—Purification or separation processes
- C01B21/0433—Physical processing only
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/04—Purification or separation of nitrogen
- C01B21/0405—Purification or separation processes
- C01B21/0433—Physical processing only
- C01B21/0438—Physical processing only by making use of membranes
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Drying Of Gases (AREA)
Abstract
The invention relates to SF6And N2The invention relates to a device and a method for quickly recovering and treating mixed gas6The device comprises a recovery device, a gas separation device and a nitrogen recovery device; SF is arranged on the drying and filtering device and the gas separating device through pipelines6A gas analyzer, wherein SF is arranged on the nitrogen recovery device through a pipeline6The invention relates to a gas detector, which comprises the following steps: mixing SF6And N2Step of recovering and purifying mixed gas, SF6Step of gas condensation purification, SF6And N2Step of separating the mixed gas, N2Purifying the gas and canning; adopts the compression condensation separation and the polymer membrane separation technology, improves the recovery processing speed, and realizes SF6And N2And (5) rapidly recovering and treating the mixed gas.
Description
Technical Field
The invention relates to SF6And N2A device and a method for rapidly recovering and treating mixed gas belong to the technical field of purification treatment of mixed insulating gas in the power industry.
Background
Pure SF6The (sulfur hexafluoride) gas is colorless, odorless, nontoxic and incombustible gas at normal temperature and normal pressure, has excellent insulating property and arc extinguishing capability, and is an ideal insulating medium. With the rapid development of the power industry and the improvement of the technical equipment level, a large number of sulfur hexafluoride circuit breakers and totally-enclosed combined electrical appliances are continuously put into construction and operation, and the usage amount of sulfur hexafluoride is larger and larger.
However, SF6Gases also have their disadvantages in applications: (1) the electric field uniformity is sensitive, and the advantages can be displayed only in a uniform or slightly non-uniform electric field; (2) SF discharged in the atmosphere6The gas is difficult to degrade, has long existence time and has cumulative effect on global warming; (3) SF6The price of the gas is higher, and the cost is increased.
In recent years, more and more attention is paid to the reduction of greenhouse gas emission and environmental protection at home and abroad, and in order to respond to environmental protection requirements, the emission of sulfur hexafluoride greenhouse gas is reduced in various large related industries; the method is also used for reducing the consumption of sulfur hexafluoride gas in high-voltage switch electrical equipment and promoting the application of mixed insulating gas in the electrical equipment, in particular to promote the SF6And N2Use of mixed insulating gases, in use, for SF6And N2And (5) carrying out purity detection on the mixed insulating gas.
SF generally used in high and cold low temperature areas of China6And N2The gas inside the high-voltage switch equipment of the mixed gas also needs to be recycled and purified under the condition that the gas does not meet the use standard of sulfur hexafluoride gas in operation. But now at the stageThe similar equipment on the market relates to the aspects of purification and purification of sulfur hexafluoride gas, and relates to N2The related equipment for separation and purification is not mature.
Chinese patent 'a separation and purification treatment device for sulfur hexafluoride and nitrogen mixed gas and a method for purifying and treating mixed gas' (patent number CN 104174249B) provides a method for purifying and treating SF6And N2The gas mixing method, however, has the following disadvantages: firstly, the SF is purified by adopting a liquefaction-solidification-dissolution strategy6Gas, insufficient utilization of SF6Gas is easy to compress and liquefy and N2The characteristic of difficult liquefaction, waste a large amount of energy in the heating process after cooling deeply; second, SF6And N2The mixed insulating gas is difficult to completely recover SF by only adopting compression cryogenic treatment6Gas, unrecovered SF6Gas with N2Together with the air, can cause damage to the environment.
Disclosure of Invention
The invention aims to solve the technical problem of providing the SF in the electrical equipment which has simple operation, good treatment effect, energy conservation and environmental protection6And N2A method for rapidly recovering and treating mixed insulating gas.
The invention adopts the following technical scheme:
the device comprises a check valve, a drying and filtering device and SF which are sequentially connected through a pipeline6The device comprises a recovery device, a gas separation device and a nitrogen recovery device; SF is arranged on the drying and filtering device and the gas separating device through pipelines6A gas analyzer, wherein SF is arranged on the nitrogen recovery device through a pipeline6A gas detector.
The drying and filtering device comprises a first self-sealing joint, a first ball valve, a drying tank, a filtering tank and a first buffer tank which are sequentially connected through a pipeline; a fifth pressure gauge is arranged between the first self-sealing joint and the first ball valve, the side part of the first buffer tank is respectively provided with a second self-sealing joint and a third self-sealing joint through pipelines, a first electromagnetic valve is arranged between the first buffer tank and the second self-sealing joint, and the first buffer tank and the third self-sealing jointA second ball valve is arranged between the heads, and a second self-sealing joint and SF6The recovery device is connected with the third self-sealing joint and SF6One side of the gas analyzer is connected with an interface; a first pressure sensor and a first pressure gauge are respectively arranged at the upper part of the first buffer tank through pipelines; a first screwing valve and a first safety valve are arranged between the first buffer tank and the first pressure gauge; filling a molecular sieve with the model of 5A in the drying tank; and a HEPA filter screen core is filled in the filter tank, and the filter precision is less than 0.5 mu m.
SF in the device of the invention6The recovery device comprises a first compressor, a condensing tank, a purification tank and SF which are sequentially connected through pipelines6A gas cylinder; the condensing tank is arranged above the purifying tank, the bottom of the condensing tank is connected with the top of the purifying tank, and a refrigerator is arranged between the condensing tank and the purifying tank; a first heat exchanger connected with the refrigerator is arranged in the side part of the condensing tank, and a second heat exchanger connected with the refrigerator is arranged in the top part of the purifying tank; a fourth self-sealing joint is arranged on one side of the first compressor through a pipeline and connected with the second self-sealing joint; a first one-way valve is arranged between the other side of the first compressor and the condensing tank; a fifth pressure sensor and a first temperature sensor are arranged on the purification tank; a second pressure sensor and a second pressure gauge are arranged at the top of the condensing tank, and a second screwing valve and a second safety valve are arranged between the condensing tank and the second pressure gauge; a fifth self-sealing joint, a sixth self-sealing joint and a second temperature sensor are respectively arranged on the other side of the condensing tank through pipelines, the fifth self-sealing joint and the sixth self-sealing joint are respectively connected with a gas separation device, a fourth electromagnetic valve is arranged between the condensing tank and the fifth self-sealing joint, and a third one-way valve is arranged between the condensing tank and the sixth self-sealing joint; at SF6A third ball valve is arranged between the gas storage cylinder and the purification tank; a weigher is arranged at the bottom of the purification tank; the model of the refrigerator is CWZ-75, and the refrigeration depth is-40 ℃; the first compressor is an oil-free compressor.
The gas separation device comprises a second buffer tank, a second compressor arranged at the lower part of one side of the second buffer tank through a pipeline, and a gas separation device arranged in the second buffer tank through a pipelineA membrane separation tank on the upper part of one side; a fourth ball valve is arranged between the second compressor and the second buffer tank; a tenth self-sealing joint is arranged on the other side of the second compressor through a pipeline; a seventh self-sealing joint and a second one-way valve are arranged at the upper part of one side of the second buffer tank through a pipeline, the seventh self-sealing joint is connected with a fifth self-sealing joint, and the tenth self-sealing joint is connected with a sixth self-sealing joint; install the relief pressure valve between membrane separation jar and second buffer tank, set up the eighth in the membrane separation jar outside and proclaim oneself the joint fourth check valve that second buffer tank opposite side lower part and bottom set up through the pipeline respectively, the ninth proclaim oneself joint and sixth ball valve, eleventh proclaim oneself the joint, proclaim oneself the joint and the ninth proclaim oneself the joint and be connected with nitrogen recovery unit respectively in the eighth, proclaim oneself the joint and SF from the joint and be connected with SF recovery unit6The other side of the gas analyzer is connected with an interface; a third pressure sensor and a third pressure gauge are arranged at the top of the second buffer tank, and a third screwing valve and a third safety valve are arranged between the second buffer tank and the third pressure gauge; the second compressor is an oil-free compressor; and a hollow fiber gas separation membrane is filled in the membrane separation tank.
The nitrogen recovery device comprises N connected through a pipeline2The gas storage cylinder, the third compressor and the nitrogen tank; a twelfth self-sealing joint and a fifth electromagnetic valve are arranged outside the third compressor through a pipeline, wherein N is2The gas storage cylinder is connected with a pipeline between the twelfth self-sealing joint and the fifth electromagnetic valve in parallel, and N is2The upper part of the gas storage cylinder is provided with a fifth ball valve; the twelfth self-sealing joint is connected with the ninth self-sealing joint, a sixth electromagnetic valve, a thirteenth self-sealing joint, a seventh ball valve and a fourteenth self-sealing joint are arranged on the upper portion and the lower portion of the other side of the nitrogen tank through pipelines respectively, the thirteenth self-sealing joint is connected with the eighth self-sealing joint, and the fourteenth self-sealing joint is connected with the SF self-sealing joint6The gas detector is connected; a fourth pressure sensor and a fourth pressure gauge are arranged at the top of the nitrogen tank, and a fourth screwing valve and a fourth safety valve are arranged between the nitrogen tank and the fourth pressure gauge; the third compressor is an oil-free compressor, the inlet gas pressure is 0.05MPa to 2MPa, and the outlet gas pressure is greater than 12.5 MPa.
Hair brushBright set of said SF6Model number of gas analyzer is RA912FSF6(ii) a The model of the gas detector is PGD1-A-SF6。
SF according to the invention6And N2The quick recovery processing method of the mixed gas comprises the following steps:
step (one), adding SF6And N2And (3) recovering and purifying mixed gas:
before working, ensuring that various valves are all in a closed state, and recycling the check valve and SF required to be recycled6And N2Connecting the mixed gas container, opening the first ball valve and the first screw valve, SF6And N2The mixed gas is purified by sequentially passing through a drying tank, a filtering tank and a first buffer tank, and SF in the first buffer tank (205) is monitored by a first pressure sensor6And N2The pressure of the mixed gas; opening the second ball valve, opening SF6Gas analyzer for measuring SF6Gas purity, micro water and decomposed product, purified SF6And N2The water content of the mixed gas is less than 150 muL/L, the volume fraction content of sulfur dioxide is less than 1 muL/L, the volume fraction content of hydrogen sulfide is less than 1 muL/L, and the molecular sieve filled in the drying tank is replaced when the three indexes do not meet the requirements;
step (II), SF6Condensing and purifying gas:
opening the second screwing valve and starting the refrigerator, opening the first electromagnetic valve, starting the first compressor, opening the first one-way valve, SF6And N2The mixed gas enters a condensing tank, and is pressurized and cooled to obtain SF6And N2Most of SF in the mixed gas6The gas being condensed into a liquid, liquid SF6Gas enters the purification tank through a pipeline, the weight of the purification tank is measured by the weighing device to be increased by more than 100 kg than that before the purification tank starts to work, when the pressure in the purification tank is measured by the fifth pressure sensor to be more than 5MPa, the first compressor and the first check valve are closed, the third ball valve is opened, and liquid sulfur hexafluoride is filled into the SF6In the gas cylinder; the weight of the purification tank measured by the weigher is increased by less than 30 kg than that before the start of the work, and the pressure of the purification tank measured by the fifth pressure sensorWhen the pressure is less than 2MPa, the third ball valve is closed, the first electromagnetic valve, the first compressor and the first one-way valve are opened, and then SF6Condensing and purifying the gas to continue;
step (III), SF6And N2Separating mixed gas:
when the pressure of the condensing tank measured by the second pressure sensor is more than 3MPa, the fourth electromagnetic valve, the second one-way valve, the third screwing valve, the fourth screwing valve, the pressure reducing valve and the sixth electromagnetic valve are opened, and the pressure of the condensing tank contains a small part of SF6SF of gas6And N2The mixed gas enters a second buffer tank, SF6And N2The mixed gas is decompressed by a pressure reducing valve and then enters a membrane separation tank, and the SF is separated by using a hollow fiber gas separation membrane filled in the membrane separation tank6Gas and N2Gas separation, N2After passing through the hollow fiber gas separation membrane, the gas enters a nitrogen tank from a membrane separation tank; when the third pressure sensor measures that the pressure in the second buffer tank is more than 4MPa, the sixth ball valve is opened, and SF is used6SF measured by gas analyzer6When the gas purity is more than 40%, opening the fourth ball valve, the third one-way valve and starting the second compressor to enable SF in the second buffer tank6And N2Reversely compressing the mixed gas into a condensing tank, and repeating the step (II); when the third pressure sensor detects that the pressure in the second buffer tank is more than 5MPa, the fourth ball valve, the third one-way valve and the second compressor are opened, and SF in the second buffer tank is converted into SF6And N2Reversely compressing the mixed gas into a condensing tank, and repeating the step (II); when the third pressure sensor detects that the pressure in the second buffer tank is less than 2MPa, the fourth ball valve is closed, the third one-way valve is closed, and the second compressor is closed, so that the low air pressure in the second buffer tank is avoided;
step (IV), N2Gas purification and canning:
when the fourth pressure sensor detects that the pressure in the nitrogen tank is more than 5MPa, the seventh ball valve is opened, and SF is utilized6Gas detector for measuring SF of gas in nitrogen tank6Gas volume concentration; SF in nitrogen tank6When the gas content is not more than 100 mu L/L, opening a fifth electromagnetic valve, a fifth ball valve and a third compressor, and introducing nitrogenIn pot N2Compression of gas to N2The gas storage bottle; SF of gas in nitrogen tank6When the gas content is more than 100 mu L/L, opening a fifth electromagnetic valve, a fourth one-way valve and a third compressor to enable SF in the nitrogen tank to be filled6And N2Compressing the mixed gas into a second buffer tank, and repeating the step (III); and when the fourth pressure sensor detects that the pressure in the nitrogen tank is less than 2MPa, the seventh ball valve, the fifth electromagnetic valve and the third compressor are closed, so that the low air pressure in the nitrogen tank is avoided.
The invention has the following positive effects:
1. SF according to the invention6And N2The mixed gas rapid recovery processing device is in SF6Condensation purification of gas, SF6And N2A reverse loop is arranged in the mixed gas separation process to separate the SF in the second buffer tank6And N2The mixed gas is reversely compressed to a condensing tank for re-condensation and purification, thereby realizing SF to the maximum extent6And (5) recovering the gas.
2. SF according to the invention6And N2The mixed gas rapid recovery processing device is in SF6And N2Separation of the gas mixture, N2A reverse loop is arranged in the purification canning process to lead the SF of the gas in the nitrogen tank6SF when gas volume fraction content is more than 100 mu L/L6And N2The mixed gas is compressed to a second buffer tank for gas separation again, thereby reducing SF to the maximum6Mixing in N2Neutralized and eventually vented to the atmosphere, reducing SF6And (4) discharging greenhouse gases.
3. SF according to the invention6And N2Method for rapidly recovering and treating mixed gas and effectively utilizing SF6Gas compressible liquefaction, easy cooling liquefaction, N2The characteristics of no compression liquefaction and difficult cooling liquefaction are adopted, the compression condensation separation and the polymer membrane separation technology are adopted, the recovery processing speed is improved, and the SF is realized6And N2And (5) rapidly recovering and treating the mixed gas.
4. SF according to the invention6And N2SF in mixed gas rapid recovery processing method6And N2The mixed gas is dried and filtered before being recycledConversion of SF6Direct canning of the gas after liquefaction, N2Gas compression canning, SF6And N2The purity is high. Recovering the treated SF6The gas meets the requirement of GB/T12022 'Industrial sulfur hexafluoride' fresh gas standard, and the N after recovery processing2The purity is more than or equal to 99.9 percent, the two gas indexes meet the filling requirement of a mixed insulating gas tank of electrical equipment, and SF is realized6And N2And recycling the mixed insulating gas.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a drying and filtering apparatus according to the present invention;
FIG. 3 shows SF according to the invention6The structure schematic diagram of the recovery device;
FIG. 4 is a schematic view of the gas separation apparatus of the present invention;
FIG. 5 is a schematic structural view of a nitrogen recovery device according to the present invention.
Detailed Description
As shown in FIGS. 1 to 5, SF according to the invention6And N2The mixed gas rapid recovery processing device comprises a check valve 1, a drying and filtering device 2 and SF which are sequentially connected through pipelines6A recovery device 3, a gas separation device 4 and a nitrogen recovery device 5; SF is arranged on the drying and filtering device 2 and the gas separating device 4 through pipelines6A gas analyzer 6, SF is arranged on the nitrogen recovery device 5 through a pipeline6And a gas detector 7. The SF6The model of the gas analyzer 6 is RA912F II, and SF can be realized6Detecting gas purity, micro water and decomposition products; SF6The model of the gas detector 7 is PGD1-A-SF6Said SF6Gas detector capable of realizing SF6And detecting the trace concentration of the gas.
SF according to the invention6And N2The device for rapidly recovering and treating the mixed gas comprises a drying and filtering device 2, a gas-liquid separator and a gas-liquid separator, wherein the drying and filtering device 2 comprises a first self-sealing joint 201, a first ball valve 202, a drying tank 203, a filtering tank 204 and a first buffer tank 205 which are sequentially connected through pipelines; a fifth pressure gauge 214 is arranged between the first self-sealing joint 201 and the first ball valve 202, anda second self-sealing joint 207 and a third self-sealing joint 208 are respectively arranged at the side part of the first buffer tank 205 through a pipeline, a first solenoid valve 206 is arranged between the first buffer tank 205 and the second self-sealing joint 207, a second ball valve 211 is arranged between the first buffer tank 205 and the third self-sealing joint 208, and the second self-sealing joint 207 and SF6The recovery device 3 is connected with the third self-sealing joint 208 and SF6One side of the gas analyzer 6 is connected with an interface; a first pressure sensor 209 and a first pressure gauge 210 are respectively arranged on the upper part of the first buffer tank 205 through pipelines; a first screw valve 212 and a first relief valve 213 are arranged between the first buffer tank 205 and the first pressure gauge 210; filling a molecular sieve with the model number of 5A in the drying tank 203; and a HEPA filter screen core is filled in the filter tank 204, and the filtering precision is less than 0.5 mu m.
The drying tank 203 and the filtering tank 204 are both stainless steel shells, the wall thickness of the tank body is 6mm, the volume is 50L, and the working pressure is 2 MPa; the first buffer tank 205 is a stainless steel shell, the wall thickness of the tank body is 6mm, the volume is 60L, and the working pressure is 2 MPa; the setting value of the first safety valve 213 is 3 MPa; the measuring range of the first pressure sensor 209 is 0 MPa-3 MPa, and the accuracy is +/-0.01 MPa.
SF according to the invention6And N2Device for rapid recovery and treatment of mixed gas, SF6The recovery device 3 comprises a first compressor 301, a condensing tank 302, a purifying tank 303 and SF which are connected in sequence through pipelines6 A gas cylinder 304; the condensing tank 302 is arranged above the purifying tank 303, the bottom of the condensing tank 302 is connected with the top of the purifying tank 303, and a refrigerator 307 is arranged between the condensing tank 302 and the purifying tank 303; a first heat exchanger 322 connected with a refrigerator 307 is arranged in the side part of the condensation tank 302, and a second heat exchanger 321 connected with the refrigerator 307 is arranged in the top part of the purification tank 303; the refrigerants used by the first heat exchanger 322 and the second heat exchanger 321 are provided by the refrigerator 307; a fourth self-sealing joint 305 is arranged on one side of the first compressor 301 through a pipeline, and the fourth self-sealing joint 305 is connected with the second self-sealing joint 207; a first check valve 306 is arranged between the other side of the first compressor 301 and the condensing tank 302; the other side of the first compressor 301 and the input end of the first check valve 306The condensation tank 302 is connected with the output end of the first one-way valve 306; a fifth pressure sensor 308 and a first temperature sensor 309 are provided on the purification tank 303; a second pressure sensor 310 and a second pressure gauge 311 are arranged at the top of the condensation tank 302, and a second screw valve 312 and a second safety valve 313 are arranged between the condensation tank 302 and the second pressure gauge 311; a fifth self-sealing joint 314, a sixth self-sealing joint 315 and a second temperature sensor 319 are respectively arranged on the other side of the condensation tank 302 through pipelines, the fifth self-sealing joint 314 and the sixth self-sealing joint 315 are respectively connected with the gas separation device 4, a fourth electromagnetic valve 316 is arranged between the condensation tank 302 and the fifth self-sealing joint 314, and a third one-way valve 317 is arranged between the condensation tank 302 and the sixth self-sealing joint 315; the sixth self-sealing joint 315 is connected with the input end of a third one-way valve 317, and the condensation tank 302 is connected with the output end of the third one-way valve 317; at SF6A third ball valve 318 is arranged between the gas cylinder 304 and the purification tank 303; a weigher 320 is provided at the bottom of the purification tank 303.
The first compressor 301 is an oil-free compressor, the inlet gas pressure is 0.05MPa to 1.0MPa, and the outlet gas pressure is greater than 5 MPa; the model of the refrigerator 307 is CWZ-75, the refrigeration depth is-40 ℃, and the refrigerant for refrigeration is absolute ethyl alcohol; the first heat exchanger 322 is a stainless steel coiled pipe exchanger, and the second heat exchanger 321 is a stainless steel coiled pipe exchanger; the material of the condensing tank 302 and the material of the purifying tank 303 are both stainless steel, the wall thickness of the tank body is 8mm, the working pressure is 5.0MPa, and the volume is 50L; the measuring range of the second pressure sensor 310 is 0MPa to 6.0MPa, and the precision is +/-0.01 MPa; the setting value of the second safety valve 313 is 6.0 MPa; the measurement range of the second temperature sensor 319 is-100-50 ℃, and the precision is +/-0.5 ℃; the measurement range of the fifth pressure sensor 308 is 0MPa to 6.0MPa, and the precision is +/-0.01 MPa; the measurement range of the first temperature sensor 309 is-100-50 ℃, and the accuracy is +/-0.5 ℃.
SF according to the invention6And N2The mixed gas rapid recovery processing device comprises a second buffer tank 401, a second compressor 402 arranged at the lower part of one side of the second buffer tank 401 through a pipeline and a second buffer tank arranged at the second buffer tank through a pipeline, wherein the gas separation device 4 comprises a gas separation deviceA membrane separation tank 403 at the upper part of the other side of the tank 401; a fourth ball valve 404 is installed between the second compressor 402 and the second buffer tank 401; a tenth self-sealing joint 405 is installed on the other side of the second compressor 402 through a pipeline; a seventh self-sealing joint 406 and a second one-way valve 407 are arranged at the upper part of one side of the second buffer tank 401 through pipelines, the seventh self-sealing joint 406 is connected with the input end of the second one-way valve 407, the second buffer tank 401 is connected with the output end of the second one-way valve 407, the seventh self-sealing joint 406 is connected with the fifth self-sealing joint 314, and the tenth self-sealing joint 405 is connected with the sixth self-sealing joint 315; a pressure reducing valve 408 is arranged between the membrane separation tank 403 and the second buffer tank 401, an eighth self-sealing joint 409 is arranged outside the membrane separation tank 403, the lower part and the bottom of the other side of the second buffer tank 401 are respectively connected with a fourth one-way valve 410, a ninth self-sealing joint 411, a sixth ball valve 412 and an eleventh self-sealing joint 413 which are arranged through pipelines, and the eighth self-sealing joint 409 and the ninth self-sealing joint 411 are respectively connected with the nitrogen recovery device 5; the ninth self-sealing joint 411 is connected with the input end of a fourth one-way valve 410, and the second buffer tank 401 is connected with the output end of the fourth one-way valve 410; the eleventh self-sealing joint 413 and SF6The other side of the gas analyzer 6 is connected with an interface; a third pressure sensor 414 and a third pressure gauge 415 are arranged at the top of the second buffer tank 401, and a third screw valve 416 and a third safety valve 417 are arranged between the second buffer tank 401 and the third pressure gauge 415; the second buffer tank 401 is made of stainless steel, the wall thickness of the tank body is 8mm, the working pressure is 5.0MPa, and the volume is 50L; the measurement range of the third pressure sensor 414 is 0 MPa-6.0 MPa, and the precision is +/-0.01 MPa; the setting value of the third safety valve 417 is 6.0 MPa; the second compressor 402 is an oil-free compressor, the inlet gas pressure is 0.05MPa to 1MPa, and the outlet gas pressure is greater than 5 MPa; the membrane separation tank 403 is made of a stainless steel shell, the wall thickness of the tank body is 6mm, the working pressure is 2.0MPa, the volume is 50L, and a hollow fiber gas separation membrane is filled in the tank body.
SF according to the invention6And N2The mixed gas rapid recovery processing device comprises a nitrogen recovery device 5 and N pipelines2A gas bomb 501, a third compressor 502 and a nitrogen tank 503; in the third compressorA twelfth self-sealing joint 506 and a fifth electromagnetic valve 504 are arranged outside the 502 through pipelines, and N is2The gas storage cylinder 501 is connected with and arranged on a pipeline between the twelfth self-sealing joint 506 and the fifth electromagnetic valve 504 in parallel, wherein N is2A fifth ball valve 505 is arranged at the upper part of the gas storage cylinder 501; the twelfth self-sealing joint 506 is connected with the ninth self-sealing joint 411, a sixth electromagnetic valve 507, a thirteenth self-sealing joint 508, a seventh ball valve 509 and a fourteenth self-sealing joint 510 are respectively arranged at the upper part and the lower part of the other side of the nitrogen tank 503 through pipelines, the thirteenth self-sealing joint 508 is connected with the eighth self-sealing joint 409, and the fourteenth self-sealing joint 510 is connected with the SF6The gas detector 7 is connected; a fourth pressure sensor 511 and a fourth pressure gauge 512 are provided on the top of the nitrogen gas tank 503, and a fourth screw valve 513 and a fourth safety valve 514 are provided between the nitrogen gas tank 503 and the fourth pressure gauge 512.
The nitrogen tank 503 is made of stainless steel, the wall thickness of the tank body is 8mm, the working pressure is 5.0MPa, and the volume is 50L; the measuring range of the fourth pressure sensor 511 is 0 MPa-6.0 MPa, and the precision is +/-0.01 MPa; the setting value of the fourth safety valve 514 is 6.0 MPa; the third compressor 502 is an oil-free compressor, the inlet gas pressure is 0.05MPa to 2MPa, and the outlet gas pressure is greater than 12.5 MPa.
SF according to the invention6And N2The mixed gas rapid recovery processing device is in SF6Condensation purification of gas, SF6And N2A reverse loop is arranged in the mixed gas separation process to separate the SF in the second buffer tank6And N2The mixed gas is reversely compressed to a condensing tank for re-condensation and purification, thereby realizing SF to the maximum extent6Gas recovery; SF according to the invention6And N2The mixed gas rapid recovery processing device is in SF6And N2Separation of the gas mixture, N2A reverse loop is arranged in the purification canning process to lead the SF of the gas in the nitrogen tank6SF when gas content is greater than 100 muL/L6And N2The mixed gas is compressed to a second buffer tank for gas separation again, thereby reducing SF to the maximum6Mixing in N2Neutralized and eventually vented to the atmosphere, reducing SF6And (4) discharging greenhouse gases.
SF according to the invention6And N2The quick recovery processing method of the mixed gas comprises the following steps:
step (one), adding SF6And N2And (3) recovering and purifying mixed gas:
before working, ensuring that various valves are all in a closed state, and recycling the check valve 1 and SF required to be recycled6And N2The mixed gas container is connected, and the first ball valve 202 and the first screw valve 212 are opened, SF6And N2The mixed gas is purified by passing through the drying tank 203, the filtering tank 204 and the first buffer tank 205 in sequence, and SF in the first buffer tank 205 is monitored by the first pressure sensor 2096And N2The pressure of the mixed gas; opening the second ball valve 211, opening SF6Gas analyzer 6, measuring SF6Gas purity, micro water and decomposed product, purified SF6And N2The water content of the mixed gas is less than 150 muL/L, the sulfur dioxide content is less than 1 muL/L, the hydrogen sulfide content is less than 1 muL/L, and the molecular sieve filled in the drying tank 203 is replaced when the three indexes do not meet the standard;
step (II), SF6Condensing and purifying gas:
opening the second screw valve (312) and starting the refrigerator 307, opening the first solenoid valve 206, starting the first compressor 301, opening the first check valve 306, SF6And N2The mixed gas enters a condensing tank 302, and SF is pressurized and cooled6And N2Most of SF in the mixed gas6The gas being condensed into a liquid, liquid SF6Gas enters the purification tank 303 through a pipeline, the weight of the purification tank 303 is increased by more than 100 kilograms when measured by the weighing device 320 than before the work is started, the first compressor 301 and the first check valve 306 are closed when the pressure in the purification tank 303 is measured by the fifth pressure sensor 308 to be more than 5MPa, the third ball valve 318 is opened, and liquid sulfur hexafluoride is filled into the SF6In the gas cylinder 304; the weight of the purification tank 303 is increased by less than 30 kilograms before the purification tank 303 begins to work, and when the fifth pressure sensor 308 detects that the pressure of the purification tank 303 is less than 2MPa, the third ball valve 318 is closed, and the first electromagnetic valve 206 are openedCompressor 301 and first check valve 306, SF6Condensing and purifying the gas to continue;
step (III), SF6And N2Separating mixed gas:
when the pressure of the condensation tank 302 is detected to be more than 3MPa by the second pressure sensor 310, the fourth solenoid valve 316, the second one-way valve 407, the third screw valve 416, the fourth screw valve 513, the pressure reducing valve 408 and the sixth solenoid valve 507 are opened, and the small part of SF is contained6SF of gas6And N2The mixed gas enters a second buffer tank 401, SF6And N2The mixed gas is decompressed by a decompression valve 408 and enters a membrane separation tank 403, and SF is separated by a hollow fiber gas separation membrane filled in the membrane separation tank 4036Gas and N2Gas separation, N2After passing through the hollow fiber gas separation membrane, the gas enters a nitrogen tank (503) from a membrane separation tank 403; when the third pressure sensor 414 detects that the pressure in the second buffer tank 401 is greater than 4MPa, the sixth ball valve 412 is opened, and SF is used6SF measurement by gas analyzer 66When the gas purity is more than 40%, opening the fourth ball valve 404, the third one-way valve 317 and starting the second compressor 402 to enable the SF in the second buffer tank 401 to be discharged6And N2Reversely compressing the mixed gas into the condensing tank 302, and repeating the step (II);
when the third pressure sensor 414 detects that the pressure in the second buffer tank 401 is greater than 5MPa, the fourth ball valve 404, the third one-way valve 317 and the second compressor 402 are opened, and the SF in the second buffer tank 401 is converted into the SF6And N2Reversely compressing the mixed gas into the condensing tank 302, and repeating the step (II);
when the third pressure sensor 414 detects that the pressure in the second buffer tank 401 is less than 2MPa, the fourth ball valve 404 is closed, the third check valve 317 is closed, and the second compressor 402 is closed, so that the air pressure in the second buffer tank 401 is prevented from being low; so as to avoid influencing the normal work of the hollow fiber gas separation membrane;
step (IV), N2Gas purification and canning:
when the fourth pressure sensor 511 detects that the pressure in the nitrogen tank 503 is greater than 5MPa, the seventh ball valve 509 is opened by using SF6Gas detectionInstrument 7 measures the SF of the gas in nitrogen tank 5036Gas volume concentration; SF in nitrogen tank 5036When the gas content is not more than 100 mu L/L, opening a fifth electromagnetic valve 504, a fifth ball valve 505 and a third compressor 502, and introducing N in a nitrogen tank 5032Compression of gas to N2The gas storage cylinder 501; SF of gas in nitrogen tank 5036When the gas content is more than 100 mu L/L, the fifth electromagnetic valve 504, the fourth one-way valve 410 and the third compressor 502 are opened, and SF in the nitrogen tank 503 is filled6And N2Compressing the mixed gas into a second buffer tank 401, and repeating the step (three);
when the fourth pressure sensor 511 detects that the pressure in the nitrogen tank 503 is less than 2MPa, the seventh ball valve 509, the fifth electromagnetic valve (504) and the third compressor 502 are closed to avoid the low pressure in the nitrogen tank 503. So as not to affect the normal operation of the hollow fiber gas separation membrane filled in the membrane separation tank 403.
SF according to the invention6And N2Method for rapidly recovering and treating mixed gas and effectively utilizing SF6Gas compressible liquefaction, easy cooling liquefaction, N2The characteristics of no compression liquefaction and difficult cooling liquefaction are adopted, the compression condensation separation and the polymer membrane separation technology are adopted, the recovery processing speed is improved, and the SF is realized6And N2Rapidly recovering and treating the mixed gas; SF according to the invention6And N2SF in mixed gas rapid recovery processing method6And N2The mixed gas is dried, filtered and purified before being recycled, and SF6Direct canning of the gas after liquefaction, N2Gas compression canning, SF6And N2The purity is high. Recovering the treated SF6The gas meets the requirement of GB/T12022 'Industrial sulfur hexafluoride' fresh gas standard, and the N after recovery processing2The purity is more than or equal to 99.9 percent, the two gas indexes meet the filling requirement of a mixed insulating gas tank of electrical equipment, and SF is realized6And N2And recycling the mixed insulating gas.
Claims (3)
1. SF (sulfur hexafluoride)6And N2The mixed gas rapid recovery processing device is characterized by comprising a check valve (1) and a dry valve which are sequentially connected through a pipelineDrying and filtering device (2), SF6A recovery device (3), a gas separation device (4) and a nitrogen recovery device (5); SF is arranged on the drying and filtering device (2) and the gas separating device (4) through pipelines6A gas analyzer (6) installed with SF on the nitrogen gas recovery device (5) through a pipeline6A gas detector (7);
the drying and filtering device (2) comprises a first self-sealing joint (201), a first ball valve (202), a drying tank (203), a filtering tank (204) and a first buffer tank (205) which are sequentially connected through pipelines; install fifth manometer (214) between first proclaim oneself joint (201) and first ball valve (202) first buffer tank (205) lateral part sets up second proclaim oneself joint (207) and third proclaim oneself joint (208) through the pipeline respectively, installs first solenoid valve (206) between first buffer tank (205) and second proclaim oneself joint (207), installs second ball valve (211) between first buffer tank (205) and third proclaim oneself joint (208), proclaim oneself joint (207) and SF second proclaim oneself and connect (207) and SF6The recovery device (3) is connected, and the third self-sealing joint (208) is connected with SF6One side of the gas analyzer (6) is connected with an interface;
a first pressure sensor (209) and a first pressure gauge (210) are respectively arranged at the upper part of the first buffer tank (205) through pipelines; a first screwing valve (212) and a first safety valve (213) are arranged between the first buffer tank (205) and the first pressure gauge (210);
filling a molecular sieve with the model number of 5A in the drying tank (203); a HEPA filter screen core is filled in the filter tank (204), and the filtering precision is less than 0.5 mu m;
the SF6The recovery device (3) comprises a first compressor (301), a condensing tank (302), a purification tank (303) and SF which are sequentially connected through pipelines6A gas cylinder (304); the condensation tank (302) is arranged above the purification tank (303), the bottom of the condensation tank (302) is connected with the top of the purification tank (303), and a refrigerator (307) is arranged between the condensation tank (302) and the purification tank (303); a first heat exchanger (322) connected with a refrigerator (307) is arranged in the side part of the condensing tank (302), and a second heat exchanger (321) connected with the refrigerator (307) is arranged in the top part of the purifying tank (303);
a fourth self-sealing joint (305) is arranged on one side of the first compressor (301) through a pipeline, and the fourth self-sealing joint (305) is connected with the second self-sealing joint (207); a first one-way valve (306) is arranged between the other side of the first compressor (301) and a condensing tank (302);
a fifth pressure sensor (308) and a first temperature sensor (309) are arranged on the purification tank (303);
a second pressure sensor (310) and a second pressure gauge (311) are arranged at the top of the condensation tank (302), and a second screw valve (312) and a second safety valve (313) are arranged between the condensation tank (302) and the second pressure gauge (311);
a fifth self-sealing joint (314), a sixth self-sealing joint (315) and a second temperature sensor (319) are respectively arranged on the other side of the condensation tank (302) through pipelines, the fifth self-sealing joint (314) and the sixth self-sealing joint (315) are respectively connected with the gas separation device (4), a fourth electromagnetic valve (316) is arranged between the condensation tank (302) and the fifth self-sealing joint (314), and a third one-way valve (317) is arranged between the condensation tank (302) and the sixth self-sealing joint (315);
at SF6A third ball valve (318) is arranged between the gas storage bottle (304) and the purification tank (303); a weigher (320) is arranged at the bottom of the purification tank (303);
the model of the refrigerator (307) is CWZ-75, and the refrigeration depth is-40 ℃;
the first compressor (301) is an oil-free compressor;
the gas separation device (4) comprises a second buffer tank (401), a second compressor (402) arranged at the lower part of one side of the second buffer tank (401) through a pipeline, and a membrane separation tank (403) arranged at the upper part of the other side of the second buffer tank (401) through a pipeline;
installing a fourth ball valve (404) between the second compressor (402) and the second buffer tank (401);
installing a tenth self-sealing joint (405) on the other side of the second compressor (402) through a pipeline;
a seventh self-sealing joint (406) and a second one-way valve (407) are arranged at the upper part of one side of the second buffer tank (401) through a pipeline, the seventh self-sealing joint (406) is connected with the fifth self-sealing joint (314), and the tenth self-sealing joint (405) is connected with the sixth self-sealing joint (315);
a membrane separation tank (403) and a second buffer tank (401) are arranged between the twoPress valve (408), set up the eighth from sealing joint (409) in membrane separation jar (403) outside second buffer tank (401) opposite side lower part and bottom are respectively through fourth check valve (410), ninth from sealing joint (411) and sixth ball valve (412), the eleventh from sealing joint (413) that the pipeline set up, eighth from sealing joint (409) and ninth from sealing joint (411) and be connected with nitrogen gas recovery unit (5) respectively, eleventh from sealing joint (413) and SF6The other side of the gas analyzer (6) is connected with an interface;
a third pressure sensor (414) and a third pressure gauge (415) are arranged at the top of the second buffer tank (401), and a third screwing valve (416) and a third safety valve (417) are arranged between the second buffer tank (401) and the third pressure gauge (415);
the second compressor (402) is an oil-free compressor; the membrane separation tank (403) is filled with a hollow fiber gas separation membrane;
the nitrogen recovery device (5) comprises N connected through a pipeline2A gas storage cylinder (501), a third compressor (502) and a nitrogen tank (503);
a twelfth self-sealing joint (506) and a fifth electromagnetic valve (504) are arranged outside the third compressor (502) through pipelines, and N is2The gas storage cylinder (501) is arranged on a pipeline between the twelfth self-sealing joint (506) and the fifth electromagnetic valve (504) in parallel, and N is2A fifth ball valve (505) is arranged at the upper part of the gas storage bottle (501); the twelfth self-sealing joint (506) is connected with the ninth self-sealing joint (411),
a sixth electromagnetic valve (507), a thirteenth self-sealing joint (508), a seventh ball valve (509) and a fourteenth self-sealing joint (510) are respectively arranged at the upper part and the lower part of the other side of the nitrogen tank (503) through pipelines,
the thirteenth self-sealing joint (508) is connected with the eighth self-sealing joint (409), and the fourteenth self-sealing joint (510) is connected with SF6The gas detector (7) is connected;
a fourth pressure sensor (511) and a fourth pressure gauge (512) are arranged at the top of the nitrogen tank (503), and a fourth screwing valve (513) and a fourth safety valve (514) are arranged between the nitrogen tank (503) and the fourth pressure gauge (512);
the third compressor (502) is an oil-free compressor, the inlet gas pressure is 0.05 MPa-2 MPa, and the outlet gas pressure is greater than 12.5 MPa.
2. SF according to claim 16And N2The device for rapidly recovering and treating the mixed gas is characterized in that the SF6The gas analyzer (6) is RA912F (II), SF6The model of the gas detector (7) is PGD1-A-SF6。
3. SF (sulfur hexafluoride)6And N2The method for rapidly recovering and treating the mixed gas is characterized by comprising the following steps of:
step (one), adding SF6And N2And (3) recovering and purifying mixed gas:
before working, ensuring that various valves are all in a closed state, and connecting the check valve (1) with SF to be recycled6And N2Connecting the mixed gas container, opening the first ball valve (202) and the first screwing valve (212), SF6And N2The mixed gas is purified by sequentially passing through a drying tank (203), a filtering tank (204) and a first buffer tank (205), and SF in the first buffer tank (205) is monitored by a first pressure sensor (209)6And N2The pressure of the mixed gas;
opening the second ball valve (211), opening SF6A gas analyzer (6) for measuring SF6Gas purity, micro water and decomposed product, purified SF6And N2The water content of the mixed gas is less than 150 muL/L, the sulfur dioxide is less than 1 muL/L, the hydrogen sulfide content is less than 1 muL/L, and the molecular sieve filled in the drying tank (203) is replaced when the three indexes do not meet the requirements;
step (II), SF6Condensing and purifying gas:
opening the second screw valve (312) and starting the refrigerator (307), opening the first solenoid valve (206), starting the first compressor (301), opening the first check valve (306), SF6And N2The mixed gas enters a condensing tank (302), and SF is pressurized and cooled6And N2Most of SF in the mixed gas6The gas being condensed into a liquid, liquid SF6The gas enters a purifying tank (303) through a pipeline and is weighedWhen the mass of the purification tank (303) is increased by more than 100 kilograms when measured by the device (320) than before the work is started, and when the pressure in the purification tank (303) is more than 5MPa when measured by the fifth pressure sensor (308), the first compressor (301) and the first check valve (306) are closed, the third ball valve (318) is opened, and liquid sulfur hexafluoride is filled into the SF6A gas cylinder (304); the weight of the purification tank (303) is increased by less than 30 kilograms when measured by the weigher (320) than before the start of work, when the pressure of the purification tank (303) is measured by the fifth pressure sensor (308) to be less than 2MPa, the third ball valve (318) is closed, the first electromagnetic valve (206), the first compressor (301) and the first one-way valve (306) are opened, and then SF is detected6Condensing and purifying the gas to continue;
step (III), SF6And N2Separating mixed gas:
when the pressure of the condensation tank (302) is measured to be more than 3MPa by the second pressure sensor (310), the fourth electromagnetic valve (316), the second one-way valve (407), the third screwing valve (416), the fourth screwing valve (513), the pressure reducing valve (408) and the sixth electromagnetic valve (507) are opened, and the pressure containing a small part of SF6SF of gas6And N2The mixed gas enters a second buffer tank (401), and SF6And N2The mixed gas is decompressed by a decompression valve (408) and then enters a membrane separation tank (403), and the SF is separated by a hollow fiber gas separation membrane filled in the membrane separation tank (403)6Gas and N2Gas separation, N2After passing through the hollow fiber gas separation membrane, the gas enters a nitrogen tank (503) from a membrane separation tank (403);
when the third pressure sensor (414) detects that the pressure in the second buffer tank (401) is more than 4MPa, the sixth ball valve (412) is opened, and SF is used6SF measured by a gas analyzer (6)6When the gas purity is more than 40%, opening a fourth ball valve (404), a third one-way valve (317) and starting a second compressor (402) to enable SF in a second buffer tank (401)6And N2Reversely compressing the mixed gas into a condensing tank (302), and repeating the step (II);
when the third pressure sensor (414) detects that the pressure in the second buffer tank (401) is more than 5MPa, the fourth ball valve (404), the third one-way valve (317) and the second compressor (402) are opened, and SF in the second buffer tank (401) is treated6And N2Reversely compressing the mixed gas into a condensing tank (302), and repeating the step (II);
when the third pressure sensor (414) detects that the pressure in the second buffer tank (401) is less than 2MPa, the fourth ball valve (404) is closed, the third one-way valve (317) is closed, the second compressor (402) is closed, and the low air pressure in the second buffer tank (401) is avoided;
step (IV), N2Gas purification and canning:
when the fourth pressure sensor (511) detects that the pressure in the nitrogen tank (503) is more than 5MPa, the seventh ball valve (509) is opened and SF is used6The gas detector (7) measures SF of the gas in the nitrogen tank (503)6Gas volume concentration; SF in nitrogen tank (503)6When the gas content is not more than 100 mu L/L, opening a fifth electromagnetic valve (504), a fifth ball valve (505) and a third compressor (502), and introducing N in a nitrogen tank (503)2Compression of gas to N2The gas storage bottle (501); SF of gas in nitrogen tank (503)6When the gas content is more than 100 mu L/L, opening a fifth electromagnetic valve (504), a fourth one-way valve (410) and a third compressor (502), and introducing SF in a nitrogen tank (503)6And N2Compressing the mixed gas into a second buffer tank (401), and repeating the step (III);
and when the fourth pressure sensor (511) detects that the pressure in the nitrogen tank (503) is less than 2MPa, the seventh ball valve (509), the fifth electromagnetic valve (504) and the third compressor (502) are closed, so that the low pressure in the nitrogen tank (503) is avoided.
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| CN201711381517.XA CN108101006B (en) | 2017-12-20 | 2017-12-20 | SF (sulfur hexafluoride)6And N2Device and method for rapidly recovering and treating mixed gas |
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| CN201711381517.XA CN108101006B (en) | 2017-12-20 | 2017-12-20 | SF (sulfur hexafluoride)6And N2Device and method for rapidly recovering and treating mixed gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109276976B (en) * | 2018-12-05 | 2023-07-04 | 国家电网有限公司 | Recovery device and method for sulfur hexafluoride and nitrogen mixed gas |
| CN111547685B (en) * | 2020-04-10 | 2022-01-25 | 国网河北省电力有限公司电力科学研究院 | Low-concentration SF6 gas recovery processing device and method in closed space |
| CN113074320B (en) * | 2021-03-19 | 2022-06-14 | 国网新疆电力有限公司检修公司 | SF (sulfur hexafluoride)6/CF4High-purity separation and recovery device and method for mixed gas |
| 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 |
| CN114100310A (en) * | 2021-12-02 | 2022-03-01 | 国网安徽省电力有限公司电力科学研究院 | SF under sudden failure in GIL pipe gallery6Quick recovery system and device for gas leakage |
| CN114857492B (en) * | 2022-04-19 | 2023-10-31 | 安徽新力电业科技咨询有限责任公司 | Sectional type supercharged and continuously stored SF 6 Gas on-site recovery device |
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