CN109444341B - Portable detection device and detection method for purity of environment-friendly mixed insulating gas - Google Patents
Portable detection device and detection method for purity of environment-friendly mixed insulating gas Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 128
- 239000004065 semiconductor Substances 0.000 claims abstract description 44
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 17
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 28
- 238000000746 purification Methods 0.000 claims description 15
- 238000004321 preservation Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 231100000331 toxic Toxicity 0.000 claims description 8
- 230000002588 toxic effect Effects 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 110
- 238000009413 insulation Methods 0.000 description 7
- 229910018503 SF6 Inorganic materials 0.000 description 5
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
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Abstract
The invention provides a portable detection device and a detection method for purity of environment-friendly mixed insulating gas, wherein the device comprises an air inlet valve, a flow regulating valve, a flow detection module and O 2 Detection module and SF 6 /N 2 The device comprises a detection module, a core control system, a power supply module, a semiconductor temperature control module and an air outlet valve; the air inlet valve, the flow regulating valve, the flow detection module and the O 2 Detection module, SF 6 /N 2 The detection module and the air outlet valve are sequentially connected through a test pipeline; the O is 2 Detection module, SF 6 /N 2 The detection module is arranged in the semiconductor temperature control module; the core control system is respectively connected with the flow detection module and the semiconductor temperature control module. The invention can accurately measure SF 6 /N 2 O in mixed insulating gas 2 、SF 6 、N 2 The purity content and the test result are not influenced by the field extreme high and low temperature environment, the structure is simple, and the carrying and the operation are facilitated.
Description
Technical Field
The invention relates to the technical field of analysis and detection control of mixed gas, in particular to a method capable of accurately measuring SF 6 /N 2 O in mixed insulating gas 2 、SF 6 、N 2 A portable content detection and analysis device and a detection method.
Background
SF 6 Is widely applied to high-voltage power equipment by the characteristics of stability and excellent insulating property, but SF 6 The gas has the defects of low-temperature liquefaction and strong greenhouse effect, so that the search for an environment-friendly excellent insulation alternative medium is particularly urgent. And SF (sulfur hexafluoride) 6 /N 2 Mixed insulating gases are generally considered to be the SF with the most development prospects in the short term 6 Alternative media, currently containing small amounts of SF 6 SF of gas 6 /N 2 The mixed insulating gas has been successfully applied to gas-insulated transformers, gas-insulated pipelines and the like.
Existing SF 6 /N 2 The detection technology of the mixed insulating gas electrical equipment is relatively lacking, while SF 6 /N 2 The content mixing proportion of the mixed insulating gas is used as an important index for evaluating the state of the electrical equipment, and the insulating arc extinguishing performance of the equipment is directly affected.
The invention in China disclosed in 20170426 and with the publication number of CN106595761A discloses a sulfur hexafluoride and nitrogen mixed gas decomposition product detection system, which comprises a main control unit, a display unit, an air inlet pipeline, an air outlet pipeline, a first detection air path and a second detection air path which are arranged in parallel, wherein an air inlet of the air inlet pipeline is provided with an air inlet pipe joint with a flow regulating valve, air inlets of the first detection air path and the second detection air path are connected with an air outlet of the air inlet pipeline, and air outlets of the first detection air path and the second detection air path are connected with an air inlet of the air outlet pipeline; the first detection gas path is provided with a decomposition product, a temperature sensing unit and a flow sensing unit, and the second detection gas path is provided with a purity sensing unit and a pressure sensing unit. The invention aims to detect the content of each component of the decomposition product gas in the mixed gas, and the content of each component of the decomposition product gas in the mixed gas is obtained through an embedded algorithm comprising crossover removal, flow compensation, temperature compensation and the like. However, as the detection gas paths are two paths, each path is provided with a plurality of sensors, the structure becomes complex, the miniaturization is not facilitated, and the portable sensor is not good. And the tail gas is not purified and directly discharged, so that the environment is not polluted.
Disclosure of Invention
The invention aims to solve the technical problem of providing the portable detection device and the detection method for the purity of the environment-friendly mixed insulating gas, which can accurately measure SF 6 /N 2 O in mixed insulating gas 2 、SF 6 、N 2 The purity content and the test result are not influenced by the on-site extreme high and low temperature environment, the portable detection device has simple structure, is beneficial to miniaturization, and the detection method is simple and convenient to operate.
The portable detection device of the invention is realized in such a way that: a portable detection device for purity of environment-friendly mixed insulating gas comprises an air inlet valve, a flow regulating valve, a flow detection module and O 2 Detection module and SF 6 /N 2 The device comprises a detection module, a core control system, a power supply module, a semiconductor temperature control module and an air outlet valve; the air inlet valve, the flow regulating valve, the flow detection module and the O 2 Detection module, SF 6 /N 2 The detection module and the air outlet valve are sequentially connected through a test pipeline; the O is 2 Detection module, stationThe SF 6 /N 2 The detection module is arranged in the semiconductor temperature control module; the core control system is respectively connected with the flow detection module and the semiconductor temperature control module; the power supply module is respectively connected with the core control system, the flow detection module and the O 2 Detection module and SF 6 /N 2 The semiconductor temperature control module is connected with the semiconductor temperature control module.
Further, the portable detection device of the present invention further comprises an exhaust gas purification module, wherein the exhaust gas purification module is connected to the SF 6 /N 2 And the detection module is arranged between the air outlet valve and the air outlet valve.
Further, the exhaust gas purifying module comprises a metal container and an alkaline filtering unit, wherein the alkaline filtering unit is arranged in the metal container.
Further, the flow detection module comprises a gas flow sensor and a first gas path chamber, wherein the gas flow sensor is arranged in the first gas path chamber;
the O is 2 The detection module comprises a zirconia method O 2 Sensor and second gas path chamber, the zirconia O method 2 The sensor is arranged in the second gas path cavity;
the SF 6 /N 2 The detection module comprises a thermal conduction SF method 6 /N 2 A sensor and a third gas path chamber; SF by thermal conduction 6 /N 2 The sensor is arranged in the third gas path cavity;
the semiconductor temperature control module comprises a semiconductor refrigerating sheet, a temperature measuring element, a heat preservation container, a radiator and a temperature control circuit; the temperature measuring element is arranged in the heat preservation container, the working surface of the semiconductor refrigerating sheet is attached to the heat preservation container, the radiating surface of the semiconductor refrigerating sheet is attached to the radiator, and the temperature control circuit is respectively connected with the temperature measuring element and the semiconductor refrigerating sheet;
the second air passage chamber and the third air passage chamber are both arranged in the heat-insulating container.
Further, the core control system comprises an AD collector, a display controller and an ARM processor, wherein the AD collector and the display controllerThe controllers are all connected to the ARM processor; the AD collector is also connected with the gas flow sensor and the zirconia O method 2 Sensor, the thermal conductivity SF 6 /N 2 A sensor and the temperature measuring element.
Further, the power module comprises a lithium battery, a voltage conversion circuit and a charge-discharge management circuit, wherein the lithium battery is connected with the voltage conversion circuit through the charge-discharge management circuit; the voltage conversion circuit is respectively connected with the gas flow sensor and the zirconia O method 2 Sensor, the thermal conductivity SF 6 /N 2 The sensor, the semiconductor refrigerating piece, the temperature measuring element, the AD collector, the display controller and the ARM processor.
Further, the air inlet valve and the air outlet valve are self-closing stainless steel air valves;
the flow regulating valve is a stainless steel needle type regulating valve.
The detection method of the invention is realized as follows: the method for detecting the purity of the environment-friendly mixed insulating gas is characterized by comprising the following steps of: the portable detection device for the purity of the environment-friendly mixed insulating gas is utilized, and the following steps are carried out:
s1, turning on a power supply of a portable detection device, wherein the core control system controls the semiconductor temperature control module to detect the environmental temperature of the heat preservation container, and the core control system controls the O according to a detection result 2 Second gas circuit chamber of detection module and SF 6 /N 2 Heating or refrigerating a third gas path chamber of the detection module, and finally enabling the temperature of the second gas path chamber to be constant at 25 ℃ and the temperature of the third gas path chamber to be constant at 55 ℃;
s2, switching the flow regulating valve from an initial closing state to a conducting state, and regulating the test flow to 200-300 ml/min;
s3, the tested gas flows into the O in sequence through the test pipeline 2 Detection module and SF 6 /N 2 Detection module for detecting O in gas in real time 2 、SF 6 、N 2 Content, and converted into an electrical signal for transmission to the coreA heart control system;
s4, when the core control system identifies O 2 、SF 6 、N 2 Matching the electric signals of the (E) with a built-in algorithm to calculate so as to finally obtain O 2 、SF 6 、N 2 Is an accurate content value of (2); the algorithm specifically comprises the following steps:
placing the device in a standard room temperature environment, and sequentially introducing SF with the concentration of 0-1% 6 O as bottom gas 2 Sample gas, 0-100% of N 2 SF for bottom gas 6 Sample gas, SF is 0-100% 6 N as bottom gas 2 The sample gas is fed to the detection device, the voltage signal value output by each concentration point can be read from the display module, and the functional relation between the sample gas concentration value Y and the output voltage signal value U can be obtained by using a least square linear fitting method: y=f (U) =k×u+b;
s5, the detected gas flows through the tail gas purification module, and the tail gas purification module absorbs toxic and harmful gas components in the detected gas and then discharges the toxic and harmful gas components into the air.
The invention has the following advantages: the invention adopts the internationally advanced zirconia method O 2 Sensor, thermal conductivity SF 6 /N 2 The sensor, the low-power consumption and small-volume semiconductor refrigerating sheet, and a miniature constant-temperature heat-insulating excellent testing environment are built, so that the device can accurately measure SF under the influence of extremely high and low temperature environments 6 /N 2 O in mixed insulating gas 2 、SF 6 、N 2 The content is as follows; the tail gas purification module is used for purifying toxic and harmful gas components in the tail gas, so that the tail gas is prevented from being directly discharged into the atmosphere, the environment is prevented from being polluted, and the personal safety of detection personnel is prevented from being damaged; the whole device adopts a fully-sealed design, so that leakage of gas in the test process and shortening of O by an air inlet pipeline are avoided 2 The service life of the sensor and the zero drift problem; and the detection device has simple structure, is beneficial to miniaturization and is convenient to carry and operate.
Drawings
The invention will be further described with reference to examples of embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of the principle structure of the portable detection device of the present invention.
Fig. 2 is a schematic structural diagram of a semiconductor temperature control module in the portable detection device according to the present invention.
Fig. 3 is a schematic structural diagram of a core control system in the portable detection device according to the present invention.
Fig. 4 is a schematic structural diagram of a power module in the portable detection device according to the present invention.
Detailed Description
Referring to fig. 1 to 4, the portable detecting device of the present invention includes an intake valve 1, a flow regulating valve 2, a flow detecting module 3, and an O 2 Detection module 4, SF 6 /N 2 The device comprises a detection module 5, a core control system 6, a power supply module 7, a semiconductor temperature control module 8 and an air outlet valve 9; the air inlet valve 1, the flow regulating valve 2, the flow detection module 3 and the O 2 Detection module 4, the SF 6 /N 2 The detection module 5 and the air outlet valve 9 are sequentially connected through a test pipeline 10; the O is 2 Detection module 4, the SF 6 /N 2 The detection module 5 is arranged in the semiconductor temperature control module 8; the core control system 6 is respectively connected with the flow detection module 3 and the semiconductor temperature control module 8; the power module 7 is respectively connected with the core control system 6, the flow detection module 3 and the flow detection module O 2 Detection module 4, SF 6 /N 2 A detection module 5 and said semiconductor temperature control module 8.
Wherein,
the air inlet valve 1 is a self-closing stainless steel air valve.
The flow regulating valve 2 is a stainless steel needle type regulating valve and is used for manually regulating the gas flow.
The flow detection module 3 comprises a gas flow sensor 31 and a first gas path chamber 32, wherein the gas flow sensor 31 is arranged in the first gas path chamber 32 and is used for detecting the size of the passing gas flow;
the O is 2 The detection module 4 comprises a zirconia method O 2 A sensor 41 and a second gas path chamber 42, the zirconia method O 2 Sensor 41Is disposed in the second gas path chamber 42 for detecting O in the passing gas 2 The content is as follows;
the SF 6 /N 2 The detection module 5 comprises a thermal conductivity SF method 6 /N 2 A sensor 51 and a third gas circuit chamber 52; SF by thermal conduction 6 /N 2 A sensor 51 is arranged in the third gas path chamber 52 for detecting SF in the passing gas 6 、N 2 The content is as follows;
as shown in fig. 2, the semiconductor temperature control module 8 includes a semiconductor cooling plate 81, a temperature measuring element 82, a thermal insulation container 83, a radiator 84, and a temperature control circuit 85; the temperature measuring element 82 is arranged in the heat preservation container 83, the temperature in the heat preservation container is collected in real time, the working face (front face) of the semiconductor refrigerating sheet 81 is attached to the heat preservation container 83, the working face (back face) of the semiconductor refrigerating sheet 81 is attached to the radiator 84, heat generated by the working of the semiconductor refrigerating sheet is discharged through the radiator, and the temperature control circuit 85 is connected with the semiconductor refrigerating sheet 81 and the temperature measuring element 82 and used for controlling the temperature of the whole heat preservation container; the thermal insulation container 83 is the O 2 SF described in detection Module 4 6 /N 2 The detection module 5 provides a closed constant temperature environment, the semiconductor refrigeration sheet 81 is used for refrigerating or heating (determined by the ambient temperature) the thermal insulation container 83, the temperature measuring element 82 is used for detecting the temperature in the thermal insulation container 83, the radiator 84 is used for radiating heat generated by the operation of the semiconductor refrigeration sheet 81, and the temperature control circuit 85 is used for controlling the temperature of the whole thermal insulation container 83;
the second air path chamber 42 and the third air path chamber 52 are both disposed in the thermal insulation container 83.
As shown in fig. 3, the core control system 6 includes an AD collector 61, a display controller 62, and an ARM processor 63, and the AD collector 61 and the display controller 62 are connected to the ARM processor 63; the AD collector 61 is also connected with the gas flow sensor 31 and the zirconia O method 2 Sensor 41, the thermal conductivity method SF 6 /N 2 A sensor 51 and said temperature measuring element 82. The AD collector 61 is used for collecting the gas flow sensor 31 and zirconiaMethod O 2 Sensor 41, thermal conductivity SF 6 /N 2 The electrical signals of the sensor 51 and the temperature measuring element 82 are amplified and conditioned; the display controller 62 is used for displaying the device temperature value acquired by the temperature measuring element 82, the flow value acquired by the gas flow sensor 31 and SF in real time 6 /N 2 Sensor 51, zirconia method O 2 O collected at sensor 41 2 、SF 6 、N 2 A content value; the ARM processor 63 is used for controlling the operation of the whole detection device;
as shown in fig. 4, the power module 7 includes a lithium battery 71 (for example, a 14.8V/5.5AH lithium battery), a voltage conversion circuit 72, and a charge/discharge management circuit 73, wherein the lithium battery 71 is connected to the voltage conversion circuit 72 through the charge/discharge management circuit 73; the voltage conversion circuit 72 is connected to the gas flow sensor 31 and the zirconia O process 2 Sensor 41, the thermal conductivity method SF 6 /N 2 Sensor 51, semiconductor refrigerating plate 81, temperature measuring element 82, AD collector 61, display controller 62 and ARM processor 63 for supplying flow rate detection module, O 2 Detection module and SF 6 /N 2 The semiconductor temperature control module is connected with the core control system.
The air inlet valve 1 and the air outlet valve 9 are self-closing stainless steel air valves;
the portable detection device of the invention further comprises an exhaust gas purification module 11, wherein the exhaust gas purification module 11 is connected with the SF 6 /N 2 Between the detection module 5 and said outlet valve 9. The exhaust gas purifying module 11 includes a metal container 111 and an alkaline filtering unit 112, and the alkaline filtering unit 112 is disposed in the metal container 111 and is capable of filtering acidic harmful gas components in the exhaust gas.
Based on the portable detection device for the purity of the environment-friendly mixed insulating gas, the detection method for the purity of the environment-friendly mixed insulating gas comprises the following steps:
s1, turning on a power supply of the portable detection device, wherein the core control system 6 controls the semiconductor temperature control module 8 to keep warmDetecting the ambient temperature of the container 83, and based on the detection result, detecting the temperature of the O 2 Second gas path chamber 42 of detection module 4 and SF 6 /N 2 The third air passage chamber 52 of the detection module 5 is heated or refrigerated, and finally the temperature of the second air passage chamber 42 is kept at 25 ℃, and the temperature of the third air passage chamber 52 is kept at 55 ℃;
s2, switching the flow regulating valve 2 from an initial closing state to a conducting state, and regulating the test flow to 200-300 ml/min;
s3, the tested gas flows into the O in sequence through the test pipeline 10 2 Detection module 4 and said SF 6 /N 2 Detection module 5 for detecting O in gas in real time 2 、SF 6 、N 2 Content, and converts the content into an electric signal to be transmitted to the core control system 6;
s4, when the core control system 6 recognizes O 2 、SF 6 、N 2 Matching the electric signals of the (E) with a built-in algorithm to calculate so as to finally obtain O 2 、SF 6 、N 2 Is an accurate content value of (2); the algorithm specifically comprises the following steps:
placing the device in a standard room temperature environment, and sequentially introducing SF with the concentration of 0-1% 6 O as bottom gas 2 Sample gas, 0-100% of N 2 SF for bottom gas 6 Sample gas, SF is 0-100% 6 N as bottom gas 2 The sample gas is fed to the detection device, the voltage signal value output by each concentration point can be read from the display module, and the functional relation between the sample gas concentration value Y and the output voltage signal value U can be obtained by using a least square linear fitting method: y=f (U) =k×u+b;
for example, if the display module can read the correspondence between the voltage signal value output by each concentration point and the concentration value of the sample gas, the following table is shown:
then, by linear fitting, respectively, it can be derived that:
o2 concentration value function: y is Y O2 ＝0.0029U O2 -5.9508；
SF6 concentration value function: y is Y SF6 ＝0.0403U SF6 -13.5049；
N2 concentration value function: y is Y N2 ＝0.0279U N2 +12.6284。
S5, the detected gas flows through the tail gas purification module, and the tail gas purification module absorbs toxic and harmful gas components in the detected gas and then discharges the toxic and harmful gas components into the air.
The invention can accurately measure SF 6 /N 2 O in mixed insulating gas 2 、SF 6 、N 2 Instrument for purity content, solving the problem of the prior pure SF 6 The gas detection mode cannot accurately measure SF 6 /N 2 O in mixed insulating gas 2 、SF 6 、N 2 Content, and test results are affected by the extreme high and low temperature environments in the field. The invention adopts the internationally advanced zirconia method O 2 Sensor, thermal conductivity SF 6 /N 2 The sensor, the low-power consumption and small-volume semiconductor refrigerating sheet, and a miniature constant-temperature heat-insulating excellent testing environment are built, so that the device can accurately measure SF under the influence of extremely high and low temperature environments 6 /N 2 O in mixed insulating gas 2 、SF 6 、N 2 The content is as follows; the tail gas purification module is used for purifying toxic and harmful gas components in the tail gas, so that the tail gas is prevented from being directly discharged into the atmosphere, the environment is prevented from being polluted, and the personal safety of detection personnel is prevented from being damaged; the whole device adopts a fully-sealed design, so that leakage of gas in the test process and shortening of O by an air inlet pipeline are avoided 2 The service life of the sensor and the zero drift problem; and the detection device has simple structure, is beneficial to miniaturization and is convenient to carry and operate.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the invention, and that equivalent modifications and variations of the invention in light of the spirit of the invention will be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a portable detection device of environmental protection mixed insulating gas purity which characterized in that: comprises an air inlet valve, a flow regulating valve, a flow detection module and O 2 Detection module and SF 6 /N 2 The device comprises a detection module, a core control system, a power module, a semiconductor temperature control module, an air outlet valve and a tail gas purification module; the air inlet valve, the flow regulating valve, the flow detection module and the O 2 Detection module, SF 6 /N 2 The detection module and the air outlet valve are sequentially connected through a test pipeline; the O is 2 Detection module, SF 6 /N 2 The detection module is arranged in the semiconductor temperature control module; the core control system is respectively connected with the flow detection module and the semiconductor temperature control module; the power supply module is respectively connected with the core control system, the flow detection module and the O 2 Detection module and SF 6 /N 2 A detection module and the semiconductor temperature control module; the tail gas purification module is connected with the SF 6 /N 2 The detection module is arranged between the air outlet valve and the air inlet valve;
the flow detection module comprises a gas flow sensor and a first gas path cavity, wherein the gas flow sensor is arranged in the first gas path cavity;
the O is 2 The detection module comprises a zirconia method O 2 Sensor and second gas path chamber, the zirconia O method 2 The sensor is arranged in the second gas path cavity;
the SF 6 /N 2 The detection module comprises a thermal conduction SF method 6 /N 2 A sensor and a third gas path chamber; SF by thermal conduction 6 /N 2 The sensor is arranged in the third gas path cavity;
the semiconductor temperature control module comprises a semiconductor refrigerating sheet, a temperature measuring element, a heat preservation container, a radiator and a temperature control circuit; the temperature measuring element is arranged in the heat preservation container, the working surface of the semiconductor refrigerating sheet is attached to the heat preservation container, the radiating surface of the semiconductor refrigerating sheet is attached to the radiator, and the temperature control circuit is respectively connected with the temperature measuring element and the semiconductor refrigerating sheet;
the second air passage chamber and the third air passage chamber are both arranged in the heat-insulating container.
2. The portable detection device for purity of environment-friendly mixed insulating gas according to claim 1, wherein: the tail gas purification module comprises a metal container and an alkaline filtration unit, wherein the alkaline filtration unit is arranged in the metal container.
3. The portable detection device for purity of environment-friendly mixed insulating gas according to claim 1, wherein: the core control system comprises an AD collector, a display controller and an ARM processor, wherein the AD collector and the display controller are connected to the ARM processor; the AD collector is also connected with the gas flow sensor and the zirconia O method 2 Sensor, the thermal conductivity SF 6 /N 2 A sensor and the temperature measuring element.
4. The portable detection device for purity of environment-friendly mixed insulating gas according to claim 3, wherein: the power module comprises a lithium battery, a voltage conversion circuit and a charge-discharge management circuit, wherein the lithium battery is connected with the voltage conversion circuit through the charge-discharge management circuit; the voltage conversion circuit is respectively connected with the gas flow sensor and the zirconia O method 2 Sensor, the thermal conductivity SF 6 /N 2 The sensor, the semiconductor refrigerating piece, the temperature measuring element, the AD collector, the display controller and the ARM processor.
5. The portable detection device for purity of environment-friendly mixed insulating gas according to claim 1, wherein:
the air inlet valve and the air outlet valve are self-closing stainless steel air valves;
the flow regulating valve is a stainless steel needle type regulating valve.
6. The method for detecting the purity of the environment-friendly mixed insulating gas is characterized by comprising the following steps of: using the portable detecting device for purity of environment-friendly mixed insulating gas according to any one of claims 1 to 5, and performing the steps of:
s1, turning on a power supply of a portable detection device, wherein the core control system controls the semiconductor temperature control module to detect the environmental temperature of the heat preservation container, and the core control system controls the O according to a detection result 2 Second gas circuit chamber of detection module and SF 6 /N 2 Heating or refrigerating a third gas path chamber of the detection module, and finally enabling the temperature of the second gas path chamber to be constant at 25 ℃ and the temperature of the third gas path chamber to be constant at 55 ℃;
s2, switching the flow regulating valve from an initial closing state to a conducting state, and regulating the test flow to 200-300 ml/min;
s3, the tested gas flows into the O in sequence through the test pipeline 2 Detection module and SF 6 /N 2 Detection module for detecting O in gas in real time 2 、SF 6 、N 2 The content is converted into an electric signal and transmitted to the core control system;
s4, when the core control system identifies O 2 、SF 6 、N 2 Matching the electric signals of the (E) with a built-in algorithm to calculate so as to finally obtain O 2 、SF 6 、N 2 Is an accurate content value of (2); the algorithm specifically comprises the following steps:
placing the device in a standard room temperature environment, and sequentially introducing SF with the concentration of 0-1% 6 O as bottom gas 2 Sample gas, 0-100% of N 2 SF for bottom gas 6 Sample gas, SF is 0-100% 6 N as bottom gas 2 The sample gas is fed to the detection device, the voltage signal value output by each concentration point can be read from the display module, and the functional relation between the sample gas concentration value Y and the output voltage signal value U can be obtained by using a least square linear fitting method: y=f (U) =k×u+b;
s5, the detected gas flows through the tail gas purification module, and the tail gas purification module absorbs toxic and harmful gas components in the detected gas and then discharges the toxic and harmful gas components into the air.
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| CN109444341B true CN109444341B (en) | 2024-01-30 |
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