CN116481735A - Sulfur hexafluoride gas leakage detection device and detection method - Google Patents
Sulfur hexafluoride gas leakage detection device and detection method Download PDFInfo
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- CN116481735A CN116481735A CN202310387947.1A CN202310387947A CN116481735A CN 116481735 A CN116481735 A CN 116481735A CN 202310387947 A CN202310387947 A CN 202310387947A CN 116481735 A CN116481735 A CN 116481735A
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- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 37
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 9
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 120
- 239000011261 inert gas Substances 0.000 claims description 23
- 238000005086 pumping Methods 0.000 claims description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000002238 carbon nanotube film Substances 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 3
- 230000004044 response Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/129—Diode type sensors, e.g. gas sensitive Schottky diodes
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- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to the technical field of gas detection and discloses a sulfur hexafluoride gas leakage detection device and a detection method. According to the detection device, the resistance value and the change trend of the gas sensor before and after contact with the gas to be detected are detected, so that the concentration of sulfur hexafluoride in the gas to be detected is calculated, the gas sensor is a metal doped carbon nano tube sensor, the gas adsorption activity is high, and the sensitivity and the selectivity are improved.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a sulfur hexafluoride gas leakage detection device and a detection method.
Background
Sulfur hexafluoride is used as a medium gas with particularly stable insulating property and is widely applied to the power industry. After a period of use, electrical equipment, devices, and containers containing sulfur hexafluoride gas may leak due to physical damage, chemical corrosion, natural aging, and the like. Leakage of sulfur hexafluoride will cause potential safety hazards for operation of corresponding power equipment or devices, environmental pollution, etc. Therefore, it is very important to periodically check the power system or other sulfur hexafluoride filled container equipment for leaks and accurately locate the leak point when a leak occurs.
The infrared leakage detection works on the principle that each substance has its own absorption spectrum, i.e. absorbs light of a certain wavelength or within a certain wavelength range, while being transparent to light of other wavelengths. Since sulfur hexafluoride has the strongest light absorption capacity to the wavelength range, it can be detected by a light source of far infrared wavelength in this wavelength range. When there is a gas leak, light incident on the area will be absorbed, and when the area is observed by an infrared camera without light reflection, a dark area appears. By observing the dark area, it can be initially considered that the dark area may be a gas leakage area.
The existing detection of Gas leakage defects of Gas-insulated metal-enclosed equipment has the following problems that firstly, a detection personnel periodically uses a handheld infrared leak detector to carry out inspection on the surface of the power equipment, the infrared leak detector is required to be aligned with the power equipment to be detected outside a specified safety distance, the focal length is adjusted, the Gas-insulated metal-enclosed power transmission line (Gas-insulated metal-enclosedTransmissionLine, GIL) in a pipe gallery is used as a special Gas-insulated metal-enclosed equipment, the length is generally about hundreds of meters, the Gas-insulated metal-enclosed power transmission line can reach thousands of meters under special conditions, manual high-frequency inspection is difficult to realize, secondly, when leakage is weaker, due to small absorption of sulfur hexafluoride, shadow is weaker, manual judgment is difficult, accurate judgment cannot be carried out on the leakage defects, thirdly, the leakage speed of the leakage points cannot be accurately estimated manually, the leakage defect endangered degree cannot be effectively judged, and the position inconvenient for infrared leakage detection in the detection process is not provided with an alternative scheme, and the overlooked problem is often selected. These above mentioned disadvantages create a very high safety risk for the safe and stable operation of the grid.
Disclosure of Invention
In order to solve the above-mentioned shortcomings in the background art, the present invention aims to provide a sulfur hexafluoride gas leakage detection device and a detection method, wherein the detection device calculates the concentration of sulfur hexafluoride in the gas to be detected by detecting the resistance value and the variation trend before and after the gas sensor contacts the gas to be detected, the gas sensor is a metal doped carbon nano tube sensor, the adsorption activity is obviously improved by the strengthening mechanism of gas reaction, and the gas sensitivity response trend and the response value are changed to different degrees by metal doping, so that the sensitivity and the selectivity of the material are improved to a great extent.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a sulfur hexafluoride gas leakage detection device, including detecting the room, detect room bottom fixed mounting gas sensor, detect room top fixed mounting laser emitter, gas sensor and electrochemical workstation electric connection, detect sulfur hexafluoride concentration in the gas that awaits measuring through the resistance change of continuous measurement gas sensor, laser emitter and light source drive module electric connection, detect room bottom and be equipped with first air inlet and gas vent, first air inlet passes through the pipeline and is connected with the end of giving vent to anger of first air inlet pump, the gas that awaits measuring is carried by the air inlet pump and is got into in the detection room, the gas vent passes through the pipeline and links to each other with the inlet end of vacuum pump, be equipped with the barometer on the pipeline between gas vent and the vacuum pump, the end of giving vent to anger of vacuum pump passes through pipeline and exhaust treatment device.
Further preferably, the side wall of the detection chamber is provided with a second air inlet, the second air inlet is connected with the air outlet end of the second air inlet pump through a pipeline, the air inlet end of the second air inlet pump is connected with a gas cylinder through a pipeline, and the gas cylinder is filled with inert gas.
Further preferably, the gas sensor is a metal-doped carbon nanotube sensor, and comprises an interdigital electrode, wherein the surface of the interdigital electrode is uniformly coated with a metal-doped carbon nanotube film, and the metal-doped carbon nanotube is one of Pt-CNT, ptPd-CNT or PtN-CNT.
Further preferably, the electrochemical workstation, the light source driving module, the first air inlet pump, the vacuum pump and the second air inlet pump are all electrically connected with the industrial personal computer.
A sulfur hexafluoride gas leakage detection method comprises the following steps:
s1, pumping out air in a detection chamber by using a vacuum pump, simultaneously filling inert gas into the detection chamber by using a second air inlet pump, and recording an initial state resistance value R when the resistance value measured by an electrochemical workstation is stable 0 ；
S2, pumping out inert gas in the detection chamber by using a vacuum pump, simultaneously filling gas to be detected into the detection chamber by using a first air inlet pump, enabling the resistance to change after the gas sensor contacts the gas to be detected, and recording a stable resistance value R after the resistance value measured by the electrochemical workstation is stabilized again 1 ；
S3, pumping out the gas to be detected in the detection chamber by using a vacuum pump, and simultaneously filling inert gas into the detection chamber 1 by using a second air inlet pump, so that the resistance value of the gas sensor is restored to the resistance value in the initial state;
s4, repeating the steps S2-S3, recording resistance values R1, R2, rn when the resistance of the gas sensor is stable after the gas to be detected is filled each time, transmitting resistance data to the industrial personal computer through the electrochemical workstation, and calculating sulfur hexafluoride in the gas to be detected at different time periods according to the resistance data by the industrial personal computer, thereby realizing sulfur hexafluoride gas leakage detection.
Further preferably, the inert gas is one of nitrogen, helium, argon.
Further preferably, the inert gas and the gas to be measured are charged at the same rate in steps S1 to S4, and the gas flow rate is 0.1 to 0.2L/min when the inert gas and the gas to be measured are charged.
The invention has the beneficial effects that:
according to the sulfur hexafluoride gas leakage detection device, the concentration of sulfur hexafluoride in the gas to be detected is calculated by detecting the resistance value and the change trend before and after the gas sensor contacts the gas to be detected, the gas sensor is a metal doped carbon nano tube sensor, the adsorption activity is obviously improved by a strengthening mechanism of gas reaction, and the gas sensitive response trend and the response value are changed to different degrees by metal doping, so that the sensitivity and the selectivity of the material are improved to a great extent. Inert gas is filled into the waste gas treatment device through the second air inlet pump so as to discharge gas residues after each detection, ensure the accuracy of the next detection, and the gas during the detection is pumped into the waste gas treatment device through the vacuum pump after the detection is completed and is absorbed through the treatment liquid.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram showing the overall structure of a sulfur hexafluoride gas leakage detecting device according to the present invention;
fig. 2 is a schematic structural view of a detecting chamber of the sulfur hexafluoride gas leakage detecting device of the invention.
1-detecting chamber, 101-gas sensor, 102-laser emitter, 103-first air inlet, 104-air outlet, 105-second air inlet, 2-electrochemical workstation, 3-light source driving template, 4-air inlet pump, 5-vacuum pump, 6-barometer, 7-exhaust gas treatment device, 8-second air inlet pump, 9-gas cylinder.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "open," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like indicate orientation or positional relationships, merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The utility model provides a sulfur hexafluoride gas leakage detection device, including detecting room 1, detecting room 1 bottom fixed mounting gas sensor 101, detecting room 1 top fixed mounting laser emitter 102, gas sensor 101 and electrochemical workstation 2 electric connection, detect sulfur hexafluoride concentration in the gas that awaits measuring through the resistance change of continuous measurement gas sensor 101, laser emitter 102 and light source drive module 3 electric connection, detecting room 1 bottom is equipped with first air inlet 103 and gas vent 104, first air inlet 103 passes through the pipeline and is connected with the end of giving vent to anger of first air inlet pump 4, the gas that awaits measuring is carried by air inlet pump 4 and is got into detecting room 1, gas vent 104 passes through the pipeline and links to each other with the inlet of vacuum pump 5, be equipped with barometer 6 on the pipeline between gas vent 104 and the vacuum pump 5, the end of giving vent to anger of vacuum pump 6 passes through the pipeline and exhaust treatment device 7.
The lateral wall of the detection chamber 1 is provided with a second air inlet 105, the second air inlet 105 is connected with the air outlet end of the second air inlet pump 8 through a pipeline, the air inlet end of the second air inlet pump 8 is connected with the air bottle 9 through a pipeline, inert gas is filled in the air bottle 9, and the inert gas is filled through the second air inlet pump so as to empty the air in the detection chamber 1, and meanwhile, the residual gas after each detection is discharged, so that the accuracy of the next detection is ensured.
The gas sensor is a metal-doped carbon nanotube sensor and comprises an interdigital electrode, the surface of the interdigital electrode is uniformly coated with a metal-doped carbon nanotube film, the metal-doped carbon nanotube is one of Pt-CNT, ptPd-CNT or PtN-CNT, and in a Pt-CNT, ptPd-CNT or PtN-CNT doping system, the gas-sensitive response trend and response value are changed to different degrees, so that the sensitivity and selectivity of the material are improved to a great extent.
The electrochemical workstation 2, the light source driving module 3, the first air inlet pump 4, the vacuum pump 5 and the second air inlet pump 8 are all electrically connected with the industrial personal computer, and the industrial personal computer control device works according to a set program to control the air inlet and the air exhaust of the detection chamber 1, and simultaneously record detection data and process the data.
A sulfur hexafluoride gas leakage detection method comprises the following steps:
s1, detecting by using a vacuum pump 5The air in the measuring chamber 1 is pumped out, meanwhile, inert gas is filled into the measuring chamber 1 through the second air inlet pump 8, and when the resistance value measured by the electrochemical workstation 2 is stable, the initial state resistance value R is recorded 0 ；
S2, pumping out inert gas in the detection chamber 1 by using a vacuum pump 5, simultaneously filling gas to be detected into the detection chamber 1 by using a first air inlet pump 4, enabling the resistance of the gas sensor to change after the gas sensor contacts the gas to be detected, and recording a stable resistance value R after the resistance value measured by the electrochemical workstation 2 is stabilized again 1 ；
S3, pumping out the gas to be detected in the detection chamber 1 by using the vacuum pump 5, and simultaneously filling inert gas into the detection chamber 1 through the second air inlet pump 8, so that the resistance value of the gas sensor is restored to the initial state resistance value;
s4, repeating the steps S2-S3, recording resistance values R1, R2, rn when the resistance of the gas sensor is stable after the gas to be detected is filled each time, transmitting resistance data to a through industrial personal computer by the electrochemical workstation 2, and calculating sulfur hexafluoride in the gas to be detected at different time periods according to the resistance data by the industrial personal computer, thereby realizing sulfur hexafluoride gas leakage detection.
The inert gas is one of nitrogen, helium and argon.
And the speed of filling the inert gas and the gas to be detected in the steps S1-S4 is the same, and the gas flow rate is 0.1-0.2L/min when the inert gas and the gas to be detected are filled.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (7)
1. The utility model provides a sulfur hexafluoride gas leakage detection device, its characterized in that, including detecting room (1), detection room (1) bottom fixed mounting gas sensor (101), detection room (1) top fixed mounting laser emitter (102), gas sensor (101) and electrochemical workstation (2) electric connection, resistance change through continuous measurement gas sensor (101) detects sulfur hexafluoride concentration in the gas that awaits measuring, laser emitter (102) and light source drive module (3) electric connection, detection room (1) bottom is equipped with first air inlet (103) and gas vent (104), first air inlet (103) are connected with the gas outlet end of first air inlet pump (4) through the pipeline, the gas that awaits measuring is carried by air inlet pump (4) and is got into detection room (1), gas vent (104) are connected with the gas inlet end of vacuum pump (5) through the pipeline, be equipped with barometer (6) on the pipeline between gas vent (104) and vacuum pump (5), the gas outlet end of vacuum pump (6) is through pipeline and exhaust treatment device (7).
2. The sulfur hexafluoride gas leakage detection device according to claim 1, wherein a second gas inlet (105) is formed in the side wall of the detection chamber (1), the second gas inlet (105) is connected with the gas outlet end of the second gas inlet pump (8) through a pipeline, the gas inlet end of the second gas inlet pump (8) is connected with a gas cylinder (9) through a pipeline, and inert gas is filled in the gas cylinder (9).
3. The sulfur hexafluoride gas leakage detection device of claim 1, wherein the gas sensor is a metal doped carbon nanotube sensor comprising interdigitated electrodes, the surface of the interdigitated electrodes is uniformly coated with a metal doped carbon nanotube film, and the metal doped carbon nanotube is one of Pt-CNT, ptPd-CNT, or PtN-CNT.
4. The sulfur hexafluoride gas leakage detection device according to claim 2, wherein the electrochemical workstation (2), the light source driving module (3), the first air intake pump (4), the vacuum pump (5) and the second air intake pump (8) are all electrically connected with the industrial personal computer.
5. A sulfur hexafluoride gas leakage detection method based on the apparatus of any one of claims 1-4, including the steps of:
s1, pumping out air in the detection chamber (1) by utilizing a vacuum pump (5), simultaneously filling inert gas into the detection chamber (1) through a second air inlet pump (8), and recording an initial state resistance value R when the resistance value measured by the electrochemical workstation (2) is stable 0 ；
S2, pumping out inert gas in the detection chamber (1) by using a vacuum pump (5), simultaneously filling gas to be detected into the detection chamber (1) by using a first air inlet pump (4), enabling the resistance of the gas sensor to change after the gas sensor contacts the gas to be detected, and recording a stable resistance value R when the resistance value measured by the electrochemical workstation (2) is stable again 1 ；
S3, pumping out the gas to be detected in the detection chamber (1) by using the vacuum pump (5), and simultaneously filling inert gas into the detection chamber (1) through the second air inlet pump (8), so that the resistance value of the gas sensor is restored to the initial state resistance value;
s4, repeating the steps S2-S3, recording resistance values R1, R2, rn when the resistance of the gas sensor is stable after the gas to be detected is filled each time, transmitting resistance data to a through industrial personal computer by the electrochemical workstation (2), and calculating sulfur hexafluoride in the gas to be detected in different periods by the industrial personal computer according to the resistance data, thereby realizing sulfur hexafluoride gas leakage detection.
6. The method for detecting sulfur hexafluoride gas leakage according to claim 5, wherein said inert gas is one of nitrogen, helium, and argon.
7. The method for detecting sulfur hexafluoride gas leakage according to claim 5, wherein the inert gas and the gas to be detected are filled in the steps S1 to S4 at the same rate, and the gas flow rate is 0.1 to 0.2L/min when the inert gas and the gas to be detected are filled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310387947.1A CN116481735A (en) | 2023-04-12 | 2023-04-12 | Sulfur hexafluoride gas leakage detection device and detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310387947.1A CN116481735A (en) | 2023-04-12 | 2023-04-12 | Sulfur hexafluoride gas leakage detection device and detection method |
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| Publication Number | Publication Date |
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| CN116481735A true CN116481735A (en) | 2023-07-25 |
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| CN202310387947.1A Pending CN116481735A (en) | 2023-04-12 | 2023-04-12 | Sulfur hexafluoride gas leakage detection device and detection method |
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