CN105738186A - SF6 decomposed gas detecting method - Google Patents
SF6 decomposed gas detecting method Download PDFInfo
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- CN105738186A CN105738186A CN201610117038.6A CN201610117038A CN105738186A CN 105738186 A CN105738186 A CN 105738186A CN 201610117038 A CN201610117038 A CN 201610117038A CN 105738186 A CN105738186 A CN 105738186A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/405—Concentrating samples by adsorption or absorption
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Abstract
The invention discloses an SF6 decomposed gas detecting method which adopts the following steps: 1) putting a gas chamber provided with an inlet and an outlet into a temperature-controlled cold trap; 2) putting a liquid adsorbent into the gas chamber; 3) setting the temperature of the cold trap to be slightly higher than the boiling point of SF6 gas; 4) opening valves on the inlet and the outlet, and feeding a gas to be sampled; 5) setting the temperature of the cold trap to be slightly higher than the boiling point of a gas, with the lowest boiling point, of SF6 decomposed gases, meanwhile feeding nitrogen gas from the inlet, and collecting the discharged gas through a collecting bag at the outlet; 6) repeating the step 5), setting the temperature of the cold trap from low to high according to the different boiling points of the gases of the SF6 decomposed gases, and using different collecting bags at the outlet respectively every time to collect the gases. The SF6 decomposed gas detecting method has the benefits that SF6 and the SF6 gas in the SF6 decomposed gases are removed firstly, so that follow-up interference on the sample can be avoided; the gathered SF6 decomposed gases can be further separated, so that the accuracy requirements on analysis and detection equipment are low, and the analysis is relatively accurate.
Description
Technical field
The present invention relates to electrotechnical measurement and detection technique field, particularly relate to the detection method of a kind of SF6 decomposition gas.
Background technology
SF6 is a kind of excellent dielectric and arc-extinguishing medium, it have nontoxic, non-combustible, dielectric strength is high and arc extinguishing ability is considerably beyond general dielectric feature, in uniform electric field, the dielectric strength of SF6 gas is about the 2 of the air that air pressure is identical, 5 times, simultaneously the decades of times that arc extinguishing ability is air of SF6 gas.Along with constantly growth and the environmental conservation of power demand are increasingly subject to the concern of people, SF6 gas is also more and more applied in high-voltage electrical equipment, is especially used as in gas-insulated switchgear device.But if gas-insulated switchgear device is internal occurs discharge fault, the SF6 gas of fault zone and solid insulating material to generate some harmful subfluoride by decomposing under the effect of heat and electricity, these substance reactions are very competent.When running into moisture and oxygen, these products with the reaction further such as electrode material, moisture, can generate multiple compounds (SO2F2, SOF2, SO2, H2S, HF etc.) again.These decomposition gases have toxicity or corrosivity mostly, very easily jeopardize the service life of equipment and the safety of staff, but the chromatographic process of routine is difficult to decomposition gas is analyzed detection, and main cause is: on the one hand because of the content very low (zero to tens ppm) of sulfur hexafluoride decomposition gas；The decomposition gas (such as SO2F2) having on the other hand and the character of SF6 gas are very close to, and in gas chromatograph, retention time is more or less the same, and its chromatographic peak is easily covered by SF6 background.The problem so brought is: by the impact of various factors or condition, the precision analyzing detection equipment improves limited, and cost increases significantly.So how raising is analyzed the concentration of sample and isolates the concentration of concrete every sample ingredient, enables existing analysis detection equipment to carry out accurate analysis detection, just becomes the technical barrier that this area is urgently to be resolved hurrily.
Summary of the invention
The invention aims to provide a kind of concentration effect good, separate the detection method of SF6 decomposition gas accurately.
For reaching above-mentioned purpose, the present invention implements according to techniques below scheme: the detection method of a kind of SF6 decomposition gas, adopts following steps:
1), being provided with the air chamber of entrance and exit as in the cold-trap of controllable temperature, described entrance and exit is equipped with valve；
2), in air chamber, liquid absorbent is set；
3), condenser temperature is arranged on the temperature slightly above SF6 gas boiling point；
4), opening the valve of entrance and exit, pass into gas to be sampled, now, SF6 gas is collected by outlet or absorbs, and SF6 decomposition gas is in a liquid state on the adsorbent being enriched in air chamber；
5), the boiling point of condenser temperature a kind of gas of being set slightly above in SF6 decomposition gas minimum boiling point, entrance passes into nitrogen simultaneously, and outlet collects expellant gas by collecting bag；
6), repeating step 5), set gradually condenser temperature from low to high according to the difference of the boiling point of gas each in SF6 decomposition gas, pass into nitrogen at entrance simultaneously, exit is collected with different collecting bags every time respectively.
7) gas, collected by different collecting bags carries out concentration analysis, and the type finally giving SF6 decomposition gas is constituted and ratio.
Further, described adsorbent is PorapakQ or molecular sieve or silica gel.
Further, the mixture of one or more of the order number 50/80,80/100,100/120 of described adsorbent.
Further, the temperature controlling range of described controllable temperature cold-trap is-65 DEG C 50 DEG C.
Further, the entrance and exit of described cold-trap is equipped with effusion meter.
Further, being placed in cold-trap by collecting bag, condenser temperature is set above the nitrogen boiling point boiling point lower than SF6 decomposition gas corresponding in collecting bag.
Compared with prior art, the invention have the benefit that
1, the SF6 gas in SF6 and decomposition gas thereof is first removed, it is to avoid the follow-up interference to sample；
2, the SF6 decomposition gas after enrichment can be separated further, the required precision analyzing detection equipment is low, analyze more accurate.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, and illustrative examples and explanation in this invention are used for explaining the present invention, but not as a limitation of the invention.
The present invention is mainly different according to the boiling point of following table SF6 and decomposition gas thereof, carries out enrichment and the separation of SF6 and decomposition gas thereof.
The detection method of a kind of SF6 decomposition gas, SF6 cited by upper table and the boiling point of decomposition gas thereof carry out the setting of condenser temperature in step, adopt following steps:
1), being provided with the air chamber of entrance and exit as in the cold-trap of controllable temperature, described entrance and exit is equipped with valve；
2), in air chamber, liquid absorbent is set；
3), condenser temperature is arranged on the temperature slightly above SF6 gas boiling point；
4), opening the valve of entrance and exit, pass into gas to be sampled, now, SF6 gas is collected by outlet or absorbs, and SF6 decomposition gas is in a liquid state on the adsorbent being enriched in air chamber；
5), the boiling point of condenser temperature a kind of gas of being set slightly above in SF6 decomposition gas minimum boiling point, entrance passes into nitrogen simultaneously, and outlet collects expellant gas by collecting bag；
6), repeating step 5), set gradually condenser temperature from low to high according to the difference of the boiling point of gas each in SF6 decomposition gas, pass into nitrogen at entrance simultaneously, exit is collected with different collecting bags every time respectively；
7) gas, collected by different collecting bags carries out concentration analysis, and the type finally giving SF6 decomposition gas is constituted and ratio.
Adsorbent is PorapakQ or molecular sieve or silica gel.The mixture of one or more of the order number 50/80,80/100,100/120 of described adsorbent.The entrance and exit of described cold-trap is equipped with effusion meter.Being placed in cold-trap by collecting bag, condenser temperature is set above the nitrogen boiling point boiling point lower than SF6 decomposition gas corresponding in collecting bag.
Technical scheme is not limited to the restriction of above-mentioned specific embodiment, every technology deformation made according to technical scheme, each falls within protection scope of the present invention.
Claims (7)
1. the detection method of a SF6 decomposition gas, it is characterised in that: adopt following steps:
1), being provided with the air chamber of entrance and exit as in the cold-trap of controllable temperature, described entrance and exit is equipped with valve；
2), it is provided with adsorbent in air chamber；
3), condenser temperature is arranged on the temperature slightly above SF6 gas boiling point；
4), opening the valve of entrance and exit, pass into gas to be sampled, now, SF6 gas is collected by outlet or absorbs, and SF6 decomposition gas is in a liquid state on the adsorbent being enriched in air chamber；
5), the boiling point of condenser temperature a kind of gas of being set slightly above in SF6 decomposition gas minimum boiling point, entrance passes into nitrogen simultaneously, and outlet collects expellant gas by collecting bag；
6), repeating step 5), set gradually condenser temperature from low to high according to the difference of the boiling point of gas each in SF6 decomposition gas, pass into nitrogen at entrance simultaneously, exit is collected with different collecting bags every time respectively；
7) gas, collected by different collecting bags carries out concentration analysis, and the type finally giving SF6 decomposition gas is constituted and ratio.
2. the detection method of a kind of SF6 decomposition gas according to claim 1, it is characterised in that: described adsorbent is PorapakQ or molecular sieve or silica gel.
3. the detection method of a kind of SF6 decomposition gas according to claim 2, it is characterised in that: described adsorbent is the mixture of one or more of order number 50/80,80/100,100/120.
4. the detection method of SF6 decomposition gas according to claim 1, it is characterised in that: the temperature controlling range of described controllable temperature cold-trap is-65 DEG C 50 DEG C.
5. the detection method of SF6 decomposition gas according to claim 1, it is characterised in that: the entrance and exit of described cold-trap is equipped with effusion meter.
6. the detection method of SF6 decomposition gas according to claim 1, it is characterised in that: being placed in cold-trap by collecting bag, condenser temperature is set above the nitrogen boiling point boiling point lower than SF6 decomposition gas corresponding in collecting bag.
7. the detection method of SF6 decomposition gas according to claim 1, it is characterised in that: described air chamber is U-tube or U-shaped container.
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| CN201610117038.6A CN105738186A (en) | 2016-03-02 | 2016-03-02 | SF6 decomposed gas detecting method |
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Cited By (4)
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| CN107525879A (en) * | 2017-09-26 | 2017-12-29 | 国网上海市电力公司 | A kind of method of propane content in measure insulating oil |
| CN107860837A (en) * | 2017-11-01 | 2018-03-30 | 广西电网有限责任公司电力科学研究院 | A kind of detection method of content of sulfur dioxide in sulfur hexafluoride gas |
| CN109884260A (en) * | 2019-04-12 | 2019-06-14 | 国网江苏省电力有限公司 | A kind of air-path control system, method and gas insulated combined electrical equipment GIS device |
| CN111595991A (en) * | 2020-05-28 | 2020-08-28 | 国网浙江省电力有限公司电力科学研究院 | Sulfur hexafluoride electrical decomposition intermediate product extraction device and extraction method |
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| CN107525879A (en) * | 2017-09-26 | 2017-12-29 | 国网上海市电力公司 | A kind of method of propane content in measure insulating oil |
| CN107860837A (en) * | 2017-11-01 | 2018-03-30 | 广西电网有限责任公司电力科学研究院 | A kind of detection method of content of sulfur dioxide in sulfur hexafluoride gas |
| CN107860837B (en) * | 2017-11-01 | 2020-05-12 | 广西电网有限责任公司电力科学研究院 | Method for detecting sulfur dioxide content in sulfur hexafluoride gas |
| CN109884260A (en) * | 2019-04-12 | 2019-06-14 | 国网江苏省电力有限公司 | A kind of air-path control system, method and gas insulated combined electrical equipment GIS device |
| CN111595991A (en) * | 2020-05-28 | 2020-08-28 | 国网浙江省电力有限公司电力科学研究院 | Sulfur hexafluoride electrical decomposition intermediate product extraction device and extraction method |
| CN111595991B (en) * | 2020-05-28 | 2022-08-12 | 国网浙江省电力有限公司电力科学研究院 | Sulfur hexafluoride electrical decomposition intermediate product extraction element |
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