CN111678036A - Sulfur hexafluoride tail gas recovery device - Google Patents
Sulfur hexafluoride tail gas recovery device Download PDFInfo
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- CN111678036A CN111678036A CN202010451395.2A CN202010451395A CN111678036A CN 111678036 A CN111678036 A CN 111678036A CN 202010451395 A CN202010451395 A CN 202010451395A CN 111678036 A CN111678036 A CN 111678036A
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- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 59
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 46
- 238000011084 recovery Methods 0.000 title claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 230000006835 compression Effects 0.000 claims abstract description 38
- 238000007906 compression Methods 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 47
- 230000000694 effects Effects 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 232
- 238000000354 decomposition reaction Methods 0.000 description 13
- 238000013094 purity test Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000002411 adverse Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 206010003497 Asphyxia Diseases 0.000 description 1
- 208000007101 Muscle Cramp Diseases 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 208000005392 Spasm Diseases 0.000 description 1
- 206010047924 Wheezing Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000005801 respiratory difficulty Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/065—Arrangements for producing propulsion of gases or vapours
- F17D1/07—Arrangements for producing propulsion of gases or vapours by compression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/01—Propulsion of the fluid
- F17C2227/0128—Propulsion of the fluid with pumps or compressors
- F17C2227/0135—Pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/044—Avoiding pollution or contamination
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Abstract
A sulfur hexafluoride tail gas recovery device relates to the recovery field of sulfur hexafluoride tail gas. The invention aims to solve the technical problems that the tail gas detected by the existing sulfur hexafluoride gas detecting instrument is directly discharged to the atmosphere without any treatment measures, the safety influence on the environment and field workers is large, the detection data is extremely sensitive to the pressure change of a testing cavity, and the tail gas is collected by directly using a compressor to extract air from an exhaust port of the detecting instrument, so that the test data drift is caused. The tail gas outlet of the detection instrument is provided with the gas buffer unit, the start and stop of the diaphragm pump are controlled by the controller, so that the gas pressure in the gas buffer unit is always kept in a proper range, and the gas is compressed by the gas compression unit and transferred to the gas storage unit under the condition that the gas storage unit can store sulfur hexafluoride gas with proper density. The invention can solve the environmental protection problem that greenhouse effect gas is directly discharged to pollute the atmosphere.
Description
Technical Field
The invention relates to the field of sulfur hexafluoride tail gas recovery.
Background
Sulfur hexafluoride (SF)6) As a new generation of ultrahigh voltage insulating dielectric material, the material is widely used as a good gas insulator for gas insulation of electronic and electric equipment, and plays a role in insulating and extinguishing arcs. Electrical equipment hand-off tests and preventive test protocols stipulate that SF in electrical equipment needs to be detected periodically6Humidity, purity, decomposition products, etc. of the gas, and SF6The detection instrument needs to be calibrated and checked regularly. Although sulfur hexafluoride itself is non-toxic and harmless to the human body, it is a greenhouse effect gas. This is because sulfur hexafluoride (SF)6) The effect of gas molecules on the greenhouse effect is CO225000 times of molecules, while emitting sulfur hexafluoride (SF) in the atmosphere6) The gas life is very long, about 3400 years. Sulfur hexafluoride is an asphyxiant, which in high concentrations causes respiratory difficulties, wheezing, bluish skin and mucous membranes, and general spasms. After the mixed gas of 80% of sulfur hexafluoride and 20% of oxygen is inhaled for a few minutes, limbs of a human body are numb, and even death occurs by suffocation. At present, sulfur hexafluoride tail gas is detected to be directly discharged to the atmosphere without any treatment measures, and the safety influence on the environment and field workers is large. The humidity of sulfur hexafluoride gas,The test data of the purity and the decomposition products are sensitive to the pressure change of the test cavity, the test data drift can be caused by directly using the compressor to extract air from the exhaust port of the detection instrument to collect tail gas, and the influence is avoided by searching a proper technical means.
Disclosure of Invention
The invention provides a sulfur hexafluoride tail gas recovery device, aiming at solving the technical problems that tail gas detected by a sulfur hexafluoride gas detecting instrument at present is directly discharged to the atmosphere without any treatment measures, the safety influence on environment and field workers is large, the detection data is sensitive to the pressure change of a testing cavity, and the test data drift can be caused by directly using a compressor to extract air from an exhaust port of the detecting instrument to collect the tail gas.
The sulfur hexafluoride tail gas recovery device is composed of a pressure sensor 1, a gas buffer unit 2, a gas compression unit 3, a gas storage unit 4, a diaphragm pump 5, a first electromagnetic valve 6, a second electromagnetic valve 7, a third electromagnetic valve 8 and a controller;
the pressure sensor 1 is arranged in the gas buffer unit 2, and a gas inlet of the gas buffer unit 2 is communicated with a gas outlet of the detection instrument 9; a first electromagnetic valve 6 is arranged on a pipeline between the gas buffer unit 2 and the detection instrument 9; the gas outlet of the gas buffer unit 2 is communicated with the gas inlet of the gas compression unit 3, a pipeline between the gas buffer unit 2 and the gas compression unit 3 is provided with a diaphragm pump 5 and a second electromagnetic valve 7, and the diaphragm pump 5 is arranged on one side relatively close to the gas buffer unit 2; the gas outlet of the gas compression unit 3 is communicated with the gas inlet of the gas storage unit 4, and a third electromagnetic valve 8 is arranged between the gas compression unit 3 and the gas storage unit 4;
the signal output end of the pressure sensor 1 is connected with the signal input end of the controller, and the signal output end of the controller is respectively connected with the signal input ends of the gas compression unit 3, the diaphragm pump 5, the first electromagnetic valve 6, the second electromagnetic valve 7 and the third electromagnetic valve 8.
Detection of SF6Recovery of tail gas is different from SF in the plant6Gas recovery treatment, namely, the recovery of the detection tail gas is firstly ensuredThe invention aims to develop SF (sulfur hexafluoride) by adopting a two-stage buffer mode6The recovery unit of gaseous detection tail gas realizes above-mentioned function. The method specifically comprises the following steps: according to the invention, a gas buffer unit 2 is arranged at a tail gas outlet of a detection instrument 9, a pressure sensor 1 is arranged in the gas buffer unit 2, the starting and stopping of a diaphragm pump 5 are controlled by a controller according to the gas pressure fed back by the pressure sensor 1, so that the gas pressure in the gas buffer unit 2 is always kept in a proper area (the specific pressure control range is determined according to the actual working condition), and the gas is compressed by a gas compression unit 3 and transferred to a gas storage unit 4 under the condition, so that more gas can be stored in the gas storage unit 4.
The gas buffer unit 2 temporarily stores the test tail gas below a set pressure value, and when the gas pressure value in the gas buffer unit 2 reaches the set pressure value, the controller starts the diaphragm pump 5 to collect SF in the unit 26The gas is pumped and then is compressed and transferred to a gas storage unit 4 through a gas compression unit 3; the start and stop of each electromagnetic valve, the gas compression unit 3 and the diaphragm pump 5 are controlled by a controller.
In order to ensure that the accuracy of test data is not affected when sulfur hexafluoride tail gas is recovered, it is necessary to ensure that the gas pressure in the gas buffer unit 2 is always in a proper area (the specific pressure control range is determined according to actual working conditions), and the diaphragm pump 5 can pump away the tail gas in the gas buffer unit 2 when appropriate, so that the problem of test data drift caused by directly pumping from the gas outlet of the detection instrument 9 is avoided.
The invention can realize the recovery of SF under the premise of not influencing the accuracy of the detection data6Tail gas generated by various gas detections is avoided from being discharged in the detection process6The adverse effects of gas and its decomposition products on environment and human body to realize SF6Zero emission and recycling of gas have economic, environmental and safe benefits.
Drawings
Fig. 1 is a schematic diagram of a sulfur hexafluoride tail gas recovery device according to a first embodiment.
Detailed Description
The first embodiment is as follows: the embodiment is a sulfur hexafluoride tail gas recovery device, as shown in fig. 1, and specifically comprises a pressure sensor 1, a gas buffer unit 2, a gas compression unit 3, a gas storage unit 4, a diaphragm pump 5, a first electromagnetic valve 6, a second electromagnetic valve 7, a third electromagnetic valve 8 and a controller (not shown);
the pressure sensor 1 is arranged in the gas buffer unit 2, and a gas inlet of the gas buffer unit 2 is communicated with a gas outlet of the detection instrument 9; a first electromagnetic valve 6 is arranged on a pipeline between the gas buffer unit 2 and the detection instrument 9; the gas outlet of the gas buffer unit 2 is communicated with the gas inlet of the gas compression unit 3, a pipeline between the gas buffer unit 2 and the gas compression unit 3 is provided with a diaphragm pump 5 and a second electromagnetic valve 7, and the diaphragm pump 5 is arranged on one side relatively close to the gas buffer unit 2; the gas outlet of the gas compression unit 3 is communicated with the gas inlet of the gas storage unit 4, and a third electromagnetic valve 8 is arranged between the gas compression unit 3 and the gas storage unit 4;
the signal output end of the pressure sensor 1 is connected with the signal input end of the controller, and the signal output end of the controller is respectively connected with the signal input ends of the gas compression unit 3, the diaphragm pump 5, the first electromagnetic valve 6, the second electromagnetic valve 7 and the third electromagnetic valve 8.
Detection of SF6Recovery of tail gas is different from SF in the plant6The gas recovery treatment, the recovery of the detection tail gas firstly ensures that the pressure and the gas flow rate of a gas path of a detection system are not influenced, the accuracy of a detection result is not influenced, and the gas recovery is realized on the basis, the invention aims to develop SF by adopting a two-stage buffer mode6The recovery unit of gaseous detection tail gas realizes above-mentioned function. The method specifically comprises the following steps: the invention arranges a gas buffer unit 2 at the tail gas outlet of a detecting instrument 9, installs a pressure sensor 1 in the gas buffer unit 2, controls the start and stop of a diaphragm pump 5 by a controller according to the gas pressure fed back by the pressure sensor 1, and leads the gas buffer unit to buffer the gasThe gas pressure in the unit 2 is always kept in a proper area (the specific pressure control range is determined according to the actual working condition), and the gas is compressed by the gas compression unit 3 and transferred to the gas storage unit 4 under the condition, so that more gases can be stored in the gas storage unit 4.
The gas buffer unit 2 temporarily stores the test tail gas below a set pressure value, and when the gas pressure value in the gas buffer unit 2 reaches the set pressure value, the controller starts the diaphragm pump 5 to collect SF in the unit 26The gas is pumped and then is compressed and transferred to a gas storage unit 4 through a gas compression unit 3; the start and stop of each electromagnetic valve, the gas compression unit 3 and the diaphragm pump 5 are controlled by a controller.
In order to ensure that the accuracy of test data is not affected when sulfur hexafluoride tail gas is recovered, it is necessary to ensure that the gas pressure in the gas buffer unit 2 is always in a proper area (the specific pressure control range is determined according to actual working conditions), and the diaphragm pump 5 can pump away the tail gas in the gas buffer unit 2 when appropriate, so that the problem of test data drift caused by directly pumping from the gas outlet of the detection instrument 9 is avoided.
The embodiment can realize the recovery of SF on the premise of not influencing the accuracy of the detection data6Tail gas generated by various gas detections is avoided from being discharged in the detection process6The adverse effects of gas and its decomposition products on environment and human body to realize SF6Zero emission and recycling of gas have economic, environmental and safe benefits.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the gas compression unit 3 is a cylinder. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the gas storage unit 4 is a steel cylinder. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the gas buffer unit 2 is a gas storage tank. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the controller is a combinational logic controller. The rest is the same as the fourth embodiment.
The invention was verified with the following tests:
test one: the test is a sulfur hexafluoride tail gas recovery device, as shown in fig. 1, and specifically comprises a pressure sensor 1, a gas buffer unit 2, a gas compression unit 3, a gas storage unit 4, a diaphragm pump 5, a first electromagnetic valve 6, a second electromagnetic valve 7, a third electromagnetic valve 8 and a controller;
the pressure sensor 1 is arranged in the gas buffer unit 2, and a gas inlet of the gas buffer unit 2 is communicated with a gas outlet of the detection instrument 9; a first electromagnetic valve 6 is arranged on a pipeline between the gas buffer unit 2 and the detection instrument 9; the gas outlet of the gas buffer unit 2 is communicated with the gas inlet of the gas compression unit 3, a pipeline between the gas buffer unit 2 and the gas compression unit 3 is provided with a diaphragm pump 5 and a second electromagnetic valve 7, and the diaphragm pump 5 is arranged on one side relatively close to the gas buffer unit 2; the gas outlet of the gas compression unit 3 is communicated with the gas inlet of the gas storage unit 4, and a third electromagnetic valve 8 is arranged between the gas compression unit 3 and the gas storage unit 4;
the signal output end of the pressure sensor 1 is connected with the signal input end of a controller, and the signal output end of the controller is respectively connected with the signal input ends of the gas compression unit 3, the diaphragm pump 5, the first electromagnetic valve 6, the second electromagnetic valve 7 and the third electromagnetic valve 8;
the gas compression unit 3 is a cylinder; the gas storage unit 4 is a steel cylinder; the gas buffer unit 2 is a gas storage tank; the controller is a combinational logic controller.
Detection of SF6Recovery of tail gas is different from SF in the plant6The gas recovery treatment, namely the recovery of the detection tail gas, firstly ensures that the pressure and the gas flow rate of a gas circuit of a detection system are not influenced, and the accuracy of a detection result is not influenced, so that the gas recovery is realized on the basisMode for developing SF6The recovery unit of gaseous detection tail gas realizes above-mentioned function. The method specifically comprises the following steps: this experiment sets up a gas buffer unit 2 at the tail gas outlet of detecting instrument 9, and at 2 internally mounted pressure sensor 1 of gas buffer unit, according to the gas pressure of pressure sensor 1 feedback, start and stop to diaphragm pump 5 through the controller and control, make the gas pressure in the gas buffer unit 2 remain throughout in the region of atmospheric pressure, and compress gas through gas compression unit 3 under this prerequisite, shift to gas storage unit 4, make gas storage unit 4 can store more gas in.
The gas buffer unit 2 temporarily stores the test tail gas under the atmospheric pressure, and when the gas pressure value in the gas buffer unit 2 reaches the atmospheric pressure, the controller starts the diaphragm pump 5 to collect SF in the unit 26The gas is pumped and then is compressed and transferred to a gas storage unit 4 through a gas compression unit 3; the start and stop of each electromagnetic valve, the gas compression unit 3 and the diaphragm pump 5 are controlled by a controller.
In order to ensure that the accuracy of test data is not affected when sulfur hexafluoride tail gas is recovered, the gas pressure in the gas buffer unit 2 must be ensured to be always at atmospheric pressure, and the diaphragm pump 5 can pump away the tail gas in the gas buffer unit 2 when appropriate, so that the problem of test data drift caused by directly pumping from the gas outlet of the detection instrument 9 is avoided.
The test can realize the recovery of SF on the premise of not influencing the accuracy of the detection data6Tail gas generated by various gas detections is avoided from being discharged in the detection process6The adverse effects of gas and its decomposition products on environment and human body to realize SF6Zero emission and recycling of gas have economic, environmental and safe benefits.
The maximum allowable pressure value in the gas buffer unit 2 in this test was determined by the following test, and the pressure in the gas buffer unit 2 was controlled by starting and stopping the diaphragm pump 5.
Humidity test
Using the same SF6Gas humidity detector (detecting instrument 9 in figure 1)For three different bottles of SF6The gas samples (gas sources A, B and C) are detected, the influence of different pressures in the gas buffer unit 2 on the humidity detection result is analyzed, and the maximum allowable pressure in the gas buffer unit 2 is analyzed.
The instrument adopted in the humidity test is an RA601 FD dew-point hygrometer, the measurement precision is +/-1 ℃, and the test results are shown in Table 1.
TABLE 1
Analysis of the data in table 1 shows that:
1) the greater the pressure in the gas buffer unit 2, the greater the deviation of the test data from that at atmospheric pressure;
2) when the pressure in the gas buffer unit 2 is 0.108MPa, the maximum deviation of the test data is only 0.6 ℃ compared with the test data under the atmospheric pressure, and the maximum deviation is far less than the measuring precision +/-1 ℃ of the instrument; when the pressure in the gas buffer unit 2 reaches 0.11Mpa and 0.112Mpa, the deviation thereof starts to increase, so that the allowable maximum value of the pressure in the gas buffer unit 2 is set to 0.108Mpa for the humidity test.
Second, purity test
Using the same SF6The gas purity detector (detector 9 in FIG. 1) measures four different SF bottles6The gas samples (gas sources A, B, C and D) are tested and the effect of the different pressures in the gas buffer unit 2 on the purity test results is analyzed to find the maximum allowable pressure in the gas buffer unit 2.
The purity test adopts an RA500FP type purity meter, the test principle is a thermal conductivity principle, the measurement range is 90-100%, and the test results are shown in Table 2.
TABLE 2
As can be seen from the data in table 2:
1) as in the humidity test, the greater the pressure in the gas buffer unit 2, the greater the deviation of the purity test data from the test data at atmospheric pressure;
2) in the purity test, even if the pressure in the gas buffer unit 2 reaches 0.112MPa, the maximum deviation of the test data from the test data at atmospheric pressure is not more than ± 0.2%, and therefore, the allowable maximum value in the gas buffer unit 2 can reach 0.112MPa only for the purity test.
Third, decomposition product test
Using the same SF6Gas decomposition detector (detector 9 in FIG. 1) for three different bottles of SF6Gas source samples (gas sources A, B and C) were tested and analyzed for pressure in different gas buffer units 2 versus decomposition products SO2The influence of the result is an analysis of the maximum allowable pressure in the gas buffer unit 2.
Project to SO2The components are subjected to a simulation test, an RA601FA decomposition product instrument is adopted as an instrument, the test principle is an electrochemical sensor principle, and the measurement range is 0-100 mu L/L. The test results are shown in Table 3.
TABLE 3
As can be seen from the data of Table 3, when the pressure in the gas buffer unit 2 reached 0.108MPa at the time of the decomposition product test, only the gas source C having the content of the decomposition product reaching the upper limit of the test range was slightly deviated by more than 1. mu.L/L (1.1. mu.L/L) from the test data at atmospheric pressure; when the pressures in the gas buffer unit 2 reached 0.112Mpa and 0.116Mpa, the relative deviation thereof was large, and therefore the allowable maximum value in the gas buffer unit 2 was 0.108Mpa for the decomposition product test.
In summary, the following steps:
1) when the humidity and the decomposition products are tested, the pressure in the gas buffer unit 2 is not more than 0.108MPa, and the deviation of test data is within an acceptable range;
2) during the purity test, the pressure in the gas buffer unit 2 is not more than 0.112MPa, and the deviation of test data is within an acceptable range;
3) setting the starting pressure value of the diaphragm pump 5 as a corresponding maximum allowable pressure value; when the pressure monitored by the pressure sensor 1 reaches the starting pressure value of the diaphragm pump 5, the diaphragm pump 5 starts to start, and the gas in the gas buffer unit 2 is pumped to the gas compression unit 3 to be compressed; when the pressure returns to the standard value, the diaphragm pump 5 is stopped.
Claims (5)
1. A sulfur hexafluoride tail gas recovery device is characterized by comprising a pressure sensor (1), a gas buffer unit (2), a gas compression unit (3), a gas storage unit (4), a diaphragm pump (5), a first electromagnetic valve (6), a second electromagnetic valve (7), a third electromagnetic valve (8) and a controller;
a pressure sensor (1) is arranged in the gas buffer unit (2), and a gas inlet of the gas buffer unit (2) is communicated with a gas outlet of a detection instrument (9); a first electromagnetic valve (6) is arranged on a pipeline between the gas buffer unit (2) and the detection instrument (9); the gas outlet of the gas buffer unit (2) is communicated with the gas inlet of the gas compression unit (3), a diaphragm pump (5) and a second electromagnetic valve (7) are arranged on a pipeline between the gas buffer unit (2) and the gas compression unit (3), and the diaphragm pump (5) is arranged on one side relatively close to the gas buffer unit (2); the gas outlet of the gas compression unit (3) is communicated with the gas inlet of the gas storage unit (4), and a third electromagnetic valve (8) is arranged between the gas compression unit (3) and the gas storage unit (4);
the signal output end of the pressure sensor (1) is connected with the signal input end of the controller, and the signal output end of the controller is respectively connected with the signal input ends of the gas compression unit (3), the diaphragm pump (5), the first electromagnetic valve (6), the second electromagnetic valve (7) and the third electromagnetic valve (8).
2. The sulfur hexafluoride tail gas recovery device according to claim 1, wherein the gas compression unit (3) is a cylinder.
3. The sulfur hexafluoride tail gas recovery device according to claim 1, wherein the gas storage unit (4) is a steel cylinder.
4. The sulfur hexafluoride tail gas recovery device according to claim 1, wherein the gas buffer unit (2) is a gas storage tank.
5. The sulfur hexafluoride tail gas recovery device of claim 1, wherein the controller is a combinational logic controller.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113958869A (en) * | 2021-10-19 | 2022-01-21 | 国网安徽省电力有限公司电力科学研究院 | Zero-emission insulating gas purification treatment device and method |
| CN114839235A (en) * | 2022-04-22 | 2022-08-02 | 国网黑龙江省电力有限公司电力科学研究院 | Mixed gas decomposition product measuring device based on electrochemical principle |
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| JPH09285719A (en) * | 1996-04-23 | 1997-11-04 | Mitsubishi Electric Corp | Gaseous sulfur hexafluoride recovering and regenerating device and mobile recovering and regenerating device |
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| CN114839235A (en) * | 2022-04-22 | 2022-08-02 | 国网黑龙江省电力有限公司电力科学研究院 | Mixed gas decomposition product measuring device based on electrochemical principle |
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