CN114620691B - Sulfur hexafluoride purifying device and method - Google Patents
Sulfur hexafluoride purifying device and method Download PDFInfo
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- CN114620691B CN114620691B CN202210425347.5A CN202210425347A CN114620691B CN 114620691 B CN114620691 B CN 114620691B CN 202210425347 A CN202210425347 A CN 202210425347A CN 114620691 B CN114620691 B CN 114620691B
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- separation tower
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- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 62
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000000926 separation method Methods 0.000 claims abstract description 112
- 238000007711 solidification Methods 0.000 claims abstract description 61
- 230000008023 solidification Effects 0.000 claims abstract description 59
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 21
- 238000001179 sorption measurement Methods 0.000 claims abstract description 6
- 238000009924 canning Methods 0.000 claims description 20
- 238000000746 purification Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 42
- 239000002912 waste gas Substances 0.000 abstract description 4
- 238000007710 freezing Methods 0.000 abstract description 3
- 230000008014 freezing Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/08—Separating gaseous impurities from gases or gaseous mixtures or from liquefied gases or liquefied gaseous mixtures
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention relates to a sulfur hexafluoride purifying device, which comprises: comprises a refrigerator, an oil-free compressor, an adsorption filter, liquefaction equipment, solidification equipment, a neutralization tank, a liquefaction separation tank and a liquefaction separation tower. The solidification separation tank, the solidification separation tower and the neutralization pond are all connected through a vacuum pipeline; a method for purifying sulfur hexafluoride by a sulfur hexafluoride purifying device comprises the following steps: 1. sulfur hexafluoride gas to be purified is injected into the liquefaction separation tank through a K1 port; 2. the liquefied separation tower is filled with sulfur hexafluoride gas to be purified, the refrigerator continuously cools the gas in the liquefied separation tower until the gas is liquefied, and the mixed gas which is not liquefied in the liquefied separation tower is pumped into the solidification separation tank; 3. after the mixed gas is filled in the solidification separation tower, the residual gas in the solidification separation tower is pumped to a neutralization tank for neutralization treatment and then discharged, so that the problems that equipment needs to be attended by a special person and waste gas is discharged after one-time freezing, the content of sulfur hexafluoride in the waste gas is high, and the recovery rate is lower are solved.
Description
Technical Field
The invention relates to the field of sulfur hexafluoride cutting purification, in particular to a sulfur hexafluoride purifying device and a sulfur hexafluoride cutting purifying method.
Background
Sulfur hexafluoride gas (SF 6) can be decomposed to generate partial harmful decomposition products under the action of an electric arc, and when moisture and oxygen exist, the sulfur hexafluoride gas reacts with an electrode material and the moisture to generate a compound with very complex components, so that the performance of an organic insulating material in equipment is degraded or metal is corroded, the insulating performance of the equipment is greatly reduced, serious consequences are brought to electric equipment, and potential safety hazards are caused to operators. Sulfur hexafluoride gas (SF 6) is also defined as a gas causing greenhouse effect, the greenhouse effect of the sulfur hexafluoride gas is 23900 times of that of equivalent CO2 gas, the recovered sulfur hexafluoride gas cannot be directly reused due to the fact that the recovered sulfur hexafluoride gas contains certain harmful decomposers, the recovered sulfur hexafluoride gas can be recycled after being purified and purified, and the existing sulfur hexafluoride purifying and purifying device in the market adopts a single-stage freezing, purifying and separating mode, so that the mode has the defects in actual production: 1. the equipment needs to be specially-attended, more labor cost is consumed, waste gas is discharged after one-time freezing, the content of sulfur hexafluoride in the waste gas is high, and the recovery rate is low.
In order to solve the problems in the prior art, the inventor provides a sulfur hexafluoride purification device and a method thereof.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a sulfur hexafluoride purifying device and a sulfur hexafluoride purifying method for solving the problems in the prior art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
sulfur hexafluoride purifying device: the method is characterized in that: the device comprises a refrigerator, an oil-free compressor, an adsorption filter, liquefaction equipment, solidification equipment and a neutralization tank, wherein the liquefaction equipment comprises a VZD1 low-temperature electromagnetic valve, a VZD2 low-temperature electromagnetic valve, a VT2 coaxial valve, a YS1 compressor, a LN condenser, a VD7 electric ball valve, a liquefaction separation tank and a liquefaction separation tower, and the solidification equipment comprises a VD2 electric ball valve, an oil-free vacuum pump P02, a solidification separation tank, a VD1 electric ball valve, a VD3 electric ball valve, a solidification separation tower, a VD8 electric ball valve, an oil-free vacuum pump P03 and the neutralization tank. The solidification separation tank, the solidification separation tower and the neutralization tank are all connected through a vacuum pipeline, and the liquefaction separation tower and the solidification separation tower are both provided with a pressure sensor and a temperature detection device.
Further defined, a weight scale is included that may be used to weigh the separator tank.
Further defined, liquid level sensors are provided in the solidification and liquefaction separation tanks.
A method for purifying sulfur hexafluoride by a sulfur hexafluoride purifying device comprises the following steps: the method comprises the following specific steps:
step S1: opening a VZD1 low-temperature electromagnetic valve and a VZD2 low-temperature electromagnetic valve, opening a refrigerator, simultaneously opening a VT2 coaxial valve, a YS1 compressor, a LN condenser and a VD7 electric ball valve, and injecting sulfur hexafluoride gas to be purified into the liquefaction separation tank through a K1 port;
step S2: opening the VD1 electric ball valve for 2-10 minutes to fill the liquefied separation tower with sulfur hexafluoride gas to be purified, closing the VD1 electric ball valve after two to ten minutes, continuously cooling the gas in the liquefied separation tower by a refrigerator until the gas is liquefied, continuously reducing the pressure in the liquefied separation tower in the liquefying process, opening the VD2 electric ball valve and a P02 oil-free vacuum pump if the pressure value is reduced within ten minutes to be less than 0.02MPa, and pumping the mixed gas which is not liquefied in the liquefied separation tower into a solidification separation tank;
step S3: after the extraction is finished, opening a VD1 electric ball valve for two to ten minutes, filling sulfur hexafluoride gas to be purified in a liquefaction separation tower, liquefying and separating again, repeating the step S2, after the mixed gas is filled in the solidification separation tower for two to ten minutes, closing a VD3 electric ball valve, continuously cooling the gas in the solidification separation tower by a refrigerator, continuously solidifying the sulfur hexafluoride gas, continuously reducing the pressure in the solidification separation tower in the solidification process, opening a VD8 electric ball valve and a P03 oil-free vacuum pump if the pressure value is less than 0.03MPa within ten minutes, pumping the residual gas in the solidification separation tower to a neutralization tank for neutralization treatment, and discharging;
step S4: and (5) canning the separating tank.
Further defined, the time for all the motorized ball valves to open or close is three minutes;
further limiting, the refrigerator continuously cools the gas in the liquefaction separation tower to-25 ℃ to continuously liquefy sulfur hexafluoride gas;
further limited, the refrigerator continuously cools the gas in the solidification separation tower to-65 ℃ to continuously solidify sulfur hexafluoride gas.
Compared with the prior art, the invention has the following beneficial effects:
1. the special personnel is not required to be on duty, so that the manpower consumption can be reduced;
2. can be repeatedly used, and is energy-saving and environment-friendly.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic front view of the apparatus of the present invention;
FIG. 3 is a schematic left-hand view of the apparatus of the present invention;
fig. 4 is a schematic top view of the apparatus of the present invention.
The reference symbols in the figures correspond to: 1-neutralization tank, 2-PV1 vacuum pump, 3-adsorption filter, 4-P03 oilless vacuum pump, 5-LN condenser, 6-VD7 electric ball valve, 7-VD8 electric ball valve, 8-solidification separation tower, 9-VZD1 low temperature solenoid valve, 10-VD2 electric ball valve, 11-P02 oilless vacuum pump, 12-VZD2 low temperature solenoid valve, 13-refrigerator, 14-VD3 electric ball valve, 15-liquefaction separation tower, 16-solidification separation tank, 17-VD1 electric ball valve, 18-liquid level sensor, 19-VD4 electric ball valve, 20-liquefaction separation tank, 21-VD5 electric ball valve, 22-weighing instrument, 23-K2 canning interface, 24-VD10 electric ball valve, 25-VD9 electric ball valve, 26-VD6 electric ball valve, 27-VZ4 solenoid valve, 28-VZ5 solenoid valve, 29-VZ3 solenoid valve, 30-VZ1 solenoid valve, 31-VT2 coaxial valve, 32-oil-free compressor, 33-K1 purification interface.
Detailed Description
In order that those skilled in the art can better understand the technical scheme of the present invention, the technical scheme of the present invention will be further described with reference to the accompanying drawings and examples.
Examples:
as shown in fig. 1-4, a sulfur hexafluoride purifying device: the device comprises a refrigerator 13, an oil-free compressor 32, an adsorption filter 3, liquefaction equipment, a weighing instrument 22, a solidifying device and a neutralization tank 1, wherein the liquefaction equipment comprises a VZD1 low-temperature electromagnetic valve 9, a VZD2 low-temperature electromagnetic valve 12, a VT2 coaxial valve 31, a YS1 compressor, a LN condenser 5, a VD7 electric ball valve 6, a liquefaction separation tank 20 and a liquefaction separation tank 15, the solidifying device comprises a VD2 electric ball valve 10, an oil-free vacuum pump P0211, a solidification separation tank 16, a VD1 electric ball valve 17, a VD3 electric ball valve 14, a solidification separation tank 8, a VD8 electric ball valve 7, a P03 oil-free vacuum pump 4 and the neutralization tank 1, the liquefaction separation tank 20, the liquefaction separation tank 15, the solidification separation tank 16, the solidification separation tank 8 and the neutralization tank 1 are all connected through vacuum pipelines, the liquefaction separation tank 15 and the solidification separation tank 8 are all provided with a pressure sensor and a temperature detection device, the separation tank is placed on the weighing instrument 22, and the liquid level sensor is arranged in the solidification separation tank 16 and the liquefaction separation tank 20.
A method for purifying sulfur hexafluoride by a sulfur hexafluoride purifying device comprises the following steps: the method comprises the following specific steps:
step S1: opening a VZD1 low-temperature electromagnetic valve 9 and a VZD2 low-temperature electromagnetic valve 12, opening a refrigerator 13, simultaneously opening a VT2 coaxial valve 31, a YS1 compressor, an LN condenser 5 and a VD7 electric ball valve 6, and injecting sulfur hexafluoride gas to be purified into the liquefaction separation tank 20 through a K1 purification interface 33;
step S2: opening a VD1 electric ball valve 17 for three minutes to enable the liquefaction separation tower 15 to be filled with sulfur hexafluoride gas to be purified, closing the VD1 electric ball valve 17 after three minutes, continuously cooling the gas in the liquefaction separation tower 15 by a refrigerator 13 to-25 ℃ to continuously liquefy the sulfur hexafluoride gas, continuously reducing the pressure in the liquefaction separation tower 15 in the liquefaction process, opening the VD2 electric ball valve 10 and a P02 oil-free vacuum pump 11 if the pressure value is reduced to be less than 0.02MPa within 10 minutes, and pumping the non-liquefied mixed gas in the liquefaction separation tower 15 into a solidification separation tank 16;
step S3: after the extraction, opening the VD1 electric ball valve 17 for three minutes, filling sulfur hexafluoride gas to be purified into the liquefaction separation tower 15 for re-liquefaction separation, repeating the step S2, after the solidification separation tower 8 is filled with mixed gas, closing the VD3 electric ball valve 14 after three minutes, continuously cooling the gas in the solidification separation tower 8 by the refrigerator 13, cooling to-65 ℃ to continuously solidify the sulfur hexafluoride gas, continuously reducing the pressure in the solidification separation tower 8 in the solidification process, opening the VD8 electric ball valve 7 and the P03 oilless vacuum pump 4 if the pressure value is reduced within 10 minutes to be less than 0.03MPa, and discharging the residual gas in the solidification separation tower 8 after the neutralization treatment in the neutralization tank 1.
Step S4: and (5) canning the separating tank.
In step S4, the canning of the separation tank is further divided into the canning of the solidification separation tank 16 and the canning of the liquefaction separation tank 20, and the canning of the solidification separation tank 16 is performed as follows: connecting a standard steel bottle with a K2 canning interface 23 through a high-pressure pipeline, placing the steel bottle on a weighing instrument 22, opening a VD9 electric ball valve 25, a VD6 electric ball valve 26, a VZ1 electromagnetic valve 30, a compressor, a cold LN condenser 5 and a VD7 electric ball valve 6, pumping gas in the canning pipeline into a liquefaction separation tank 20, closing the VD9 electric ball valve 25, the VD6 electric ball valve 26, the VZ1 electromagnetic valve 30, a YS1 compressor, the LN condenser 5 and the VD7 electric ball valve 6 after the vacuum degree in the canning pipeline reaches 80000Pa, simultaneously opening a VD10 electric ball valve 24 and a PV1 vacuum pump 2, vacuumizing the canning pipeline, closing the VD10 electric ball valve 24 and the PV1 vacuum pump 2 after the vacuum degree in the canning pipeline reaches 15Pa, opening a VD4 electric ball valve 19 and a low-temperature pump after thirty seconds of delay, canning sulfur hexafluoride into the steel bottle, and closing the VD4 electric ball valve 19 and the low-temperature pump after the sulfur hexafluoride weight in the steel bottle reaches a set value; the liquefaction knockout drum 20 is canned as follows: the standard steel bottle is connected with a K2 canning interface 23 through a high-pressure pipeline, the steel bottle is placed on a weighing instrument 22, a VD9 electric ball valve 25, a VD6 electric ball valve 26, a VZ1 electromagnetic valve 30, a compressor, a LN condenser 5 and a VD7 electric ball valve 6 are opened, gas in the canning pipeline is pumped into a liquefaction separation tank 20, after the vacuum degree in the canning pipeline reaches 80000Pa, the VD9 electric ball valve 25, the VD6 electric ball valve 26, the VZ1 electromagnetic valve 30, a YS1 compressor, the LN condenser 5 and the VD7 electric ball valve 6 are closed, simultaneously, a VD10 electric ball valve 24 and a PV1 vacuum pump 2 are opened, vacuumizing treatment is carried out on the canning pipeline, after the vacuum degree in the canning pipeline reaches 15Pa, the VD10 electric ball valve 24 and the PV1 vacuum pump 2 are closed, after 30 seconds of time delay, the VD5 electric ball valve 21 and the low-temperature pump are opened, the sulfur hexafluoride is canned into the steel bottle, and after the sulfur hexafluoride weight in the canning pipeline reaches a set value of sulfur hexafluoride, the VD5 electric ball valve 21 and the low-temperature pump are closed.
Compared with the prior art, the device has the functions of high recovery rate and good filling weight effect.
The sulfur hexafluoride purifying device and the sulfur hexafluoride purifying method provided by the invention are described in detail. The description of the specific embodiments is only intended to aid in understanding the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the scope of the invention as defined in the following claims.
Claims (5)
1. Sulfur hexafluoride purifying device: the method is characterized in that: comprises a refrigerator, an oil-free compressor, an adsorption filter, liquefaction equipment, solidification equipment, a weighing instrument and a neutralization pond, wherein the liquefaction equipment comprises a VZD1 low-temperature electromagnetic valve, a VZD2 low-temperature electromagnetic valve, a VT2 coaxial valve, a YS1 compressor, an LN condenser, a VD7 electric ball valve, a liquefaction separation tank and a liquefaction separation tower, the solidification equipment comprises a VD2 electric ball valve, an oil-free vacuum pump P02, a solidification separation tank, a VD1 electric ball valve, a VD3 electric ball valve, a solidification separation tower, a VD8 electric ball valve, an oil-free vacuum pump P03 and the neutralization pond, the liquefaction separation tank, the liquefaction separation tower, the solidification separation tank, the solidification separation tower and the neutralization pond are all connected through vacuum pipes, the liquefaction separation tank and a K1 liquid inlet interface are connected through vacuum pipes, the VT2 coaxial valve, the adsorption filter, the YS1 compressor, the LN condenser and the VD7 electric ball valve are sequentially arranged on the vacuum pipes between the liquefaction separation tank and the K1 liquid inlet interface, the refrigerator is connected with the liquefaction separation tank, the liquefaction separation tower, the solidification separation tank and the solidification separation tower through vacuum pipelines, the VZD1 low-temperature electromagnetic valve is arranged on the vacuum pipeline between the refrigerator and the liquefaction separation tower, the VZD2 low-temperature electromagnetic valve is arranged on the vacuum pipeline between the refrigerator and the solidification separation tower, the liquefaction separation tank is connected with the liquefaction separation tower through the vacuum pipeline, the solidification separation tank is connected with the solidification separation tower through the vacuum pipeline, the liquefaction separation tower is connected with the solidification separation tower through the vacuum pipeline, the VD1 electric ball valve is arranged on the vacuum pipeline between the liquefaction separation tower and the liquefaction separation tank, the VD3 electric ball valve is arranged on the vacuum pipeline between the solidification separation tower and the solidification separation tank, the oil-free vacuum pump P02 and the VD2 electric ball valve are arranged on a vacuum pipeline between the liquefaction separation tower and the solidification separation tower, the VD2 electric ball valve is positioned on the right side of the oil-free vacuum pump P02, the VD8 electric ball valve and the oil-free vacuum pump P03 are arranged on the vacuum pipeline between the solidification separation tower and the neutralization pond, the oil-free vacuum pump P03 is positioned on the right side of the VD8 electric ball valve, and the liquefaction separation tower and the solidification separation tower are internally provided with a pressure sensor and a temperature detection device; the solidifying and separating tank and the liquefying and separating tank are provided with liquid level sensors.
2. The method for purifying sulfur hexafluoride by using the sulfur hexafluoride purification device according to claim 1: the method is characterized in that: the method comprises the following specific steps:
step S1: opening a VZD1 low-temperature electromagnetic valve and a VZD2 low-temperature electromagnetic valve, opening a refrigerator, simultaneously opening a VT2 coaxial valve, a YS1 compressor, a LN condenser and a VD7 electric ball valve, and injecting sulfur hexafluoride gas to be purified into the liquefaction separation tank through a K1 port;
step S2: opening a VD1 electric ball valve for two to ten minutes to fill sulfur hexafluoride gas to be purified in the liquefaction separation tower, closing the VD1 electric ball valve after two to ten minutes, continuously cooling the gas in the liquefaction separation tower by a refrigerator until the gas is liquefied, continuously reducing the pressure in the liquefaction separation tower in the liquefaction process, opening the VD2 electric ball valve and a P02 oil-free vacuum pump if the reduction value of the pressure value is less than 0.02MPa within 10 minutes, and pumping the mixed gas which is not liquefied in the liquefaction separation tower into a solidification separation tank;
step S3: after the extraction is finished, opening a VD1 electric ball valve for two to ten minutes, filling sulfur hexafluoride gas to be purified in a liquefaction separation tower, liquefying and separating again, repeating the step S2, after the mixed gas is filled in the solidification separation tower for two to ten minutes, closing a VD3 electric ball valve, continuously cooling the gas in the solidification separation tower by a refrigerator, continuously solidifying the sulfur hexafluoride gas, continuously reducing the pressure in the solidification separation tower in the solidification process, opening a VD8 electric ball valve and a P03 oil-free vacuum pump if the pressure value is less than 0.03MPa within ten minutes, pumping the residual gas in the solidification separation tower to a neutralization tank for neutralization treatment, and discharging;
step S4: and (5) canning the separating tank.
3. The method for purifying sulfur hexafluoride by using the sulfur hexafluoride purification device according to claim 2, wherein: the method is characterized in that: all motorized ball valves are opened or closed for three minutes.
4. The method for purifying sulfur hexafluoride by using the sulfur hexafluoride purification device according to claim 2, wherein: in step S2, the refrigerator continuously cools the gas in the liquefaction separation tower to-25 ℃ so as to continuously liquefy the sulfur hexafluoride gas.
5. A method for purifying sulfur hexafluoride by a sulfur hexafluoride purification device according to claim 3: in step S3, the refrigerator continuously cools the gas in the solidification separation tower to-65 ℃ to continuously solidify sulfur hexafluoride gas.
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