CN114620691A - Sulfur hexafluoride purification device and method - Google Patents
Sulfur hexafluoride purification device and method Download PDFInfo
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- CN114620691A CN114620691A CN202210425347.5A CN202210425347A CN114620691A CN 114620691 A CN114620691 A CN 114620691A CN 202210425347 A CN202210425347 A CN 202210425347A CN 114620691 A CN114620691 A CN 114620691A
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- sulfur hexafluoride
- gas
- solidification
- liquefaction
- separation tower
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- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 56
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000000746 purification Methods 0.000 title claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 90
- 238000007711 solidification Methods 0.000 claims abstract description 46
- 230000008023 solidification Effects 0.000 claims abstract description 44
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000001179 sorption measurement Methods 0.000 claims abstract description 5
- 238000009924 canning Methods 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 40
- 230000003472 neutralizing effect Effects 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000007710 freezing Methods 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action 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
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram 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
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000005057 refrigeration Methods 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention relates to a sulfur hexafluoride purification device, which comprises the following components: comprises a refrigerator, an oil-free compressor, an adsorption filter, a liquefying device, a solidifying device, a neutralizing tank, a liquefying separation tank and a liquefying separation tower. The solidification separation tank, the solidification separation tower and the neutralization tank are connected through vacuum pipelines; a method for purifying sulfur hexafluoride by a sulfur hexafluoride purification device comprises the following steps: 1. injecting sulfur hexafluoride gas to be purified into the liquefaction separation tank through a K1 port; 2. filling sulfur hexafluoride gas to be purified in the liquefaction separation tower, continuously cooling the gas in the liquefaction separation tower by a refrigerator until the gas is liquefied, and pumping the unliquefied mixed gas in the liquefaction separation tower into a solidification separation tank; 3. after the solidification separation tower is filled with the mixed gas, the residual gas in the solidification separation tower is pumped to a neutralization tank for neutralization treatment and then discharged, and the problems that the equipment needs to be attended by a specially-assigned person and the waste gas is discharged after one-time freezing, the sulfur hexafluoride content in the waste gas is high, and the recovery rate is low are solved.
Description
Technical Field
The invention relates to the field of sulfur hexafluoride purification, in particular to a sulfur hexafluoride purification device and a sulfur hexafluoride purification method.
Background
Sulfur hexafluoride gas (SF6) can be decomposed to generate partial harmful decomposition products under the action of electric arcs, and when moisture and oxygen exist, the sulfur hexafluoride gas reacts with electrode materials and the moisture to generate compounds with very complex components, so that the performance degradation of organic insulating materials in equipment or the corrosion of metal can be caused, the insulating performance of the equipment is greatly reduced, serious consequences are brought to the electrical equipment, and potential safety hazards can be caused to operators. The sulfur hexafluoride gas (SF6) is also determined as a gas causing the greenhouse effect, the greenhouse effect of the gas is 23900 times of that of the equivalent CO2 gas, the recovered sulfur hexafluoride gas contains certain harmful decomposition products, can not be directly reused, and can be recycled after being purified, and the existing sulfur hexafluoride purification device in the market adopts a single-stage refrigeration purification separation mode, and the mode has the defects in the actual production: 1. the equipment needs to be attended by specially-assigned persons, more labor cost is consumed, 2, the waste gas is discharged after once freezing, the content of sulfur hexafluoride in the waste gas is high, and the recovery rate is low.
In order to solve the problems of the prior stage, 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 purification device and a method thereof to solve the problems in the prior art.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a sulfur hexafluoride purification device: the method is characterized in that: including refrigerator, oil-free compressor, adsorption filter, liquefaction equipment, solidification equipment and neutralization pond, liquefaction equipment include VZD1 low temperature solenoid valve, VZD2 low temperature solenoid valve, VT2 coaxial valve, YS1 compressor, LN condenser, VD7 electric ball valve, liquefaction knockout drum and liquefaction knockout drum, solidification equipment include VD2 electric ball valve, oil-free vacuum pump P02, solidification knockout drum, VD1 electric ball valve, VD3 electric ball valve, solidification knockout drum, VD8 electric ball valve, oil-free vacuum pump P03 and neutralization pond, liquefaction knockout drum. The solidification separation tank, the solidification separation tower and the neutralization pond are connected through vacuum pipelines, and the liquefaction separation tower and the solidification separation tower are internally provided with a pressure sensor and a temperature detection device.
Further, the separator tank further comprises a weighing instrument which can be used for weighing the separator tank.
Further defined, liquid level sensors are installed in the solidification separation tank and the liquefaction separation tank.
A method for purifying sulfur hexafluoride by a sulfur hexafluoride purification 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, starting a refrigerator, simultaneously opening a VT2 coaxial valve, a YS1 compressor, an LN condenser and a VD7 electric ball valve, and injecting sulfur hexafluoride gas to be purified into a liquefaction separation tank through a K1 port;
step S2: opening a VD1 electric ball valve for 2-10 minutes to ensure that sulfur hexafluoride gas to be purified is filled in the liquefaction separation tower, closing the VD1 electric ball valve after two-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 pressure value is reduced to be less than 0.02MPa within ten minutes, and pumping the non-liquefied mixed gas in the liquefaction separation tower into a solidification separation tank;
step S3: opening the VD1 electric ball valve for two to ten minutes after pumping, filling sulfur hexafluoride gas to be purified in the liquefaction separation tower for liquefaction separation again, repeating the step S2, filling mixed gas in the solidification separation tower for two to ten minutes, then closing the 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, if the reduction value of the pressure value is less than 0.03MPa within ten minutes, opening the VD8 electric ball valve and the P03 oil-free vacuum pump, pumping the residual gas in the solidification separation tower to a neutralization tank for neutralization treatment, and then discharging;
step S4: the separation tank is canned.
Further limiting, the opening or closing time of all the electric ball valves is three minutes;
further limiting, continuously cooling the gas in the liquefaction separation tower by the refrigerator, and continuously liquefying sulfur hexafluoride gas by cooling to-25 ℃;
further limiting, the refrigerator continuously cools the gas in the solidification separation tower to-65 ℃ so that the sulfur hexafluoride gas is continuously solidified.
Compared with the prior art, the invention has the following beneficial effects:
1. the special person is not needed to watch, so that the labor consumption can be reduced;
2. can be repeatedly used, and is energy-saving and environment-friendly.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic front view of the apparatus of the present invention;
FIG. 3 is a schematic left side view of the apparatus of the present invention;
FIG. 4 is a schematic top view of the apparatus of the present invention.
The designations in the figures correspond respectively to: 1-neutralization tank, 2-PV1 vacuum pump, 3-adsorption filter, 4-P03 oil-free vacuum pump, 5-LN condenser, 6-VD7 electric ball valve, 7-VD8 electric ball valve, 8-solidification separation tower, 9-VZD1 low-temperature electromagnetic valve, 10-VD2 electric ball valve, 11-P02 oil-free vacuum pump, 12-VZD2 low-temperature electromagnetic 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 electromagnetic valve, 28-VZ5 solenoid valve, 29-VZ3 solenoid valve, 30-VZ1 solenoid valve, 31-VT2 coaxial valve, 32-oil-free compressor, 33-K1 purge interface.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are further described below with reference to the accompanying drawings and examples.
Example (b):
as shown in fig. 1-4, a sulfur hexafluoride purification apparatus: the device comprises a refrigerator 13, an oil-free compressor 32, an adsorption filter 3, a liquefying device, a weighing instrument 22, a solidifying device and a neutralizing tank 1, wherein the liquefying device comprises a VZD1 low-temperature electromagnetic valve 9, a VZD2 low-temperature electromagnetic valve 12, a VT2 coaxial valve 31, a YS1 compressor, an LN condenser 5, a VD7 electric ball valve 6, a liquefying separation tank 20 and a liquefying separation tower 15, the solidifying device comprises a VD2 electric ball valve 10, an oil-free vacuum pump P0211, a solidifying separation tank 16, a VD1 electric ball valve 17, a VD3 electric ball valve 14, a solidifying separation tower 8, a VD8 electric ball valve 7, a P03 oil-free vacuum pump 4 and a neutralizing tank 1, the liquefying separation tank 20, the liquefying separation tower 15, the solidifying separation tank 16, the solidifying separation tower 8 and the neutralizing tank 1 are connected through vacuum pipelines, pressure sensors and temperature detection devices are arranged in the liquefying separation tower 15 and the solidifying separation tower 8, the separating tanks are placed on the weighing instrument 22, liquid level sensors are installed 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, starting a refrigerating machine 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 port;
step S2: opening the VD1 electric ball valve 17 for three minutes to fill the sulfur hexafluoride gas to be purified in the liquefaction separation tower 15, closing the VD1 electric ball valve 17 after three minutes, continuously cooling the gas in the liquefaction separation tower 15 by the 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, and opening the VD2 electric ball valve 10 and the P02 oil-free vacuum pump 11 if the pressure value is reduced to be less than 0.02MPa in 10 minutes, and pumping the unliquefied mixed gas in the liquefaction separation tower 15 into the solidification separation tank 16;
step S3: and after pumping, opening the VD1 electric ball valve 17 for three minutes, filling the sulfur hexafluoride gas to be purified in the liquefaction separation tower 15 for liquefaction separation again, repeating the step S2, filling the mixed gas in the solidification separation tower 8 for three minutes, then closing the VD3 electric ball valve 14, continuously cooling the gas in the solidification separation tower 8 by the refrigerator 13 to-65 ℃ to continuously solidify the sulfur hexafluoride gas, continuously reducing the pressure in the solidification separation tower 8 in the solidification process, and if the reduction value of the pressure value is less than 0.03MPa within 10 minutes, opening the VD8 electric ball valve 7 and the P03 oil-free vacuum pump 4, pumping the residual gas in the solidification separation tower 8 to the neutralization tank 1 for neutralization treatment and then discharging.
Step S4: the separation tank is canned.
The canning of the separation tank in the step S4 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 includes the following steps: connecting a standard steel bottle with a K2 canning connector 23 by 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, when the vacuum degree in the canned pipeline reaches 80000Pa, the VD9 electric ball valve 25, the VD6 electric ball valve 26, the VZ1 electromagnetic valve 30, the YS1 compressor, the LN condenser 5 and the VD7 electric ball valve 6 are closed, and the VD10 electric ball valve 24 and the PV1 vacuum pump 2 are opened at the same time, vacuumizing the canned pipeline, closing the VD10 electric ball valve 24 and the PV1 vacuum pump 2 when the vacuum degree in the canned pipeline reaches 15Pa, delaying thirty seconds, opening the VD4 electric ball valve 19 and the low-temperature pump, canning the sulfur hexafluoride into a steel cylinder, when the weight of sulfur hexafluoride in the steel cylinder reaches a set value, closing the VD4 electric ball valve 19 and the low-temperature pump; the steps of filling the liquefaction separation tank 20 are as follows: connecting a standard steel bottle with a K2 canning connector 23 by a high-pressure pipeline, placing the steel bottle on a weighing instrument 22, starting a VD9 electric ball valve 25, a VD6 electric ball valve 26, a VZ1 electromagnetic valve 30, a compressor, an LN condenser 5 and a VD7 electric ball valve 6, pumping gas in the canning pipeline into a liquefaction separation tank 20, when the vacuum degree in the canned pipeline reaches 80000Pa, the VD9 electric ball valve 25, the VD6 electric ball valve 26, the VZ1 electromagnetic valve 30, the YS1 compressor, the LN condenser 5 and the VD7 electric ball valve 6 are closed, and the VD10 electric ball valve 24 and the PV1 vacuum pump 2 are opened at the same time, vacuumizing the canned pipeline, closing the VD10 electric ball valve 24 and the PV1 vacuum pump 2 when the vacuum degree in the canned pipeline reaches 15Pa, delaying for 30 seconds, opening the VD5 electric ball valve 21 and the low-temperature pump, canning the sulfur hexafluoride into a steel cylinder, and when the weight of the sulfur hexafluoride in the steel cylinder reaches a set value, closing the VD5 electric ball valve 21 and the cryogenic pump.
Compared with the prior art, the device has the functions of high recovery rate and good filling weight effect.
The purification device and method for sulfur hexafluoride provided by the invention are described in detail above. The description of the specific embodiments is only intended to facilitate an understanding of the method of the invention and its core ideas. It should be noted that, for a person skilled in the art, several modifications and changes can be made to the present invention without departing from the present invention, and these modifications and changes also fall into the protection scope of the present invention.
Claims (7)
1. The utility model provides a sulfur hexafluoride purification device which characterized in that: including refrigerator, oil-free compressor, adsorption filter, liquefaction equipment, solidification equipment and neutralization pond, liquefaction equipment include VZD1 low temperature solenoid valve, VZD2 low temperature solenoid valve, VT2 coaxial valve, YS1 compressor, LN condenser, VD7 electric ball valve, liquefaction knockout drum and liquefaction knockout drum, solidification equipment include VD2 electric ball valve, oil-free vacuum pump P02, solidification knockout drum, VD1 electric ball valve, VD3 electric ball valve, solidification knockout drum, VD8 electric ball valve, oil-free vacuum pump P03 and neutralization pond, liquefaction knockout drum. The solidification separation tank, the solidification separation tower and the neutralization pond are connected through vacuum pipelines, and the liquefaction separation tower and the solidification separation tower are internally provided with a pressure sensor and a temperature detection device.
2. The sulfur hexafluoride purification device as recited in claim 1, wherein: also comprises a weighing instrument.
3. The sulfur hexafluoride purification device as recited in claim 1, wherein: liquid level sensors are arranged in the solidification separation tank and the liquefaction separation tank.
4. The method for purifying sulfur hexafluoride recited in claim 1, wherein the method comprises the following steps: 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, starting a refrigerator, simultaneously opening a VT2 coaxial valve, a YS1 compressor, an LN condenser and a VD7 electric ball valve, and injecting sulfur hexafluoride gas to be purified into a liquefaction separation tank through a K1 port;
step S2: opening the VD1 electric ball valve for two to ten minutes to ensure that the liquefaction separation tower is filled with sulfur hexafluoride gas to be purified, closing the VD1 electric ball valve after two to ten minutes, continuously cooling the gas in the liquefaction separation tower by using 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 the P02 oil-free vacuum pump if the reduction value of the pressure value is less than 0.02MPa within 10 minutes, and pumping the non-liquefied mixed gas in the liquefaction separation tower into a solidification separation tank;
step S3: and after pumping, opening the VD1 electric ball valve for two to ten minutes, filling sulfur hexafluoride gas to be purified in the liquefaction separation tower for liquefaction separation again, repeating the step S2, filling mixed gas in the solidification separation tower for two to ten minutes, then closing the 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, if the reduction value of the pressure value is less than 0.03MPa within ten minutes, opening the VD8 electric ball valve and the P03 oil-free vacuum pump, pumping the residual gas in the solidification separation tower to a neutralization tank for neutralization treatment, and then discharging.
Step S4: and canning the separation tank.
5. The method for purifying sulfur hexafluoride recited in claim 4, wherein the method comprises the following steps: the method is characterized in that: all the electric ball valves are opened or closed for three minutes.
6. The method for purifying sulfur hexafluoride recited in claim 4, wherein the method comprises the following steps: the refrigerator continuously cools the gas in the liquefaction separation tower to-25 ℃ so as to continuously liquefy the sulfur hexafluoride gas.
7. The method for purifying sulfur hexafluoride recited in claim 4, wherein the method comprises the following steps: the refrigerator continuously cools the gas in the solidification separation tower to-65 ℃ so that the sulfur hexafluoride gas is continuously solidified.
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2022
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