CN104374860A - Portable analyzer for analyzing trace dissolved gas in mineral oil and detecting method - Google Patents
Portable analyzer for analyzing trace dissolved gas in mineral oil and detecting method Download PDFInfo
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- CN104374860A CN104374860A CN201410700869.7A CN201410700869A CN104374860A CN 104374860 A CN104374860 A CN 104374860A CN 201410700869 A CN201410700869 A CN 201410700869A CN 104374860 A CN104374860 A CN 104374860A
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Abstract
The invention discloses a portable analyzer for analyzing trace dissolved gas in mineral oil and a detecting method. The portable analyzer for analyzing the trace dissolved gas in the mineral oil is characterized in that a ceramic solid oxide fuel cell detector is used for analyzing the trace dissolved gas in the mineral oil, double chromatographic columns are serially connected to each other, samples are fed into the chromatographic columns in a back flushing manner, a switching-over effect is achieved with the aid of a ten-way valve, and seven components such as hydrogen, oxygen, carbon monoxide, methane, ethylene, ethane and acetylene in the dissolved gas in the oil are analyzed. A non-split sampling mode is used in a system of the whole analyzer, all the samples are fed into the first chromatographic column at one step, after the hydrogen, the oxygen, the carbon monoxide and the methane generate peak, the ten-way valve is switched to the second chromatographic column, and then the ethylene, the ethane and the acetylene continue to generate peak. The seven components of the dissolved gas in the oil can be analyzed by the analyzer after the samples are fed at one step, only one type of carrier gas is required, a carrier gas purifying device is not required, sensitivity on key gases, particularly the hydrogen and the acetylene, of the components is excellent, and the portable analyzer is suitable for being popularized and used in projects of intelligent power grids in batches.
Description
Technical field
The invention belongs to the technology in electric power network technique field, relate to a kind of novel portable gas chromatograph and detection method, be mainly used in the mineral insulation dissolved gas analysis of large-scale oil-filled electric equipment.
Background technology
At present, carry out gas chromatographic analysis to the insulating oil of the large-scale oil-filled electric equipment of the inside such as transformer station, power plant generally to need to carry out in special laboratory, first need the operation scene of the equipment that arrives first (as generating plant, transformer station) to fetch oil sample, then off-line chromatograph in room is analyzed by experiment.Off-line chromatograph generally adopts dual-detector technology (flame ionization ditector and thermal conductivity detector (TCD)), uses parallel shunt input mode.First, in whole process, oil sample needs transport, and analytical cycle is long, period gas can dissipation of energy, especially as low-molecular-weight gas such as hydrogen, be very easy to separate out from oil, thus cause measurement result inaccurate.Secondly, above-mentioned dual-detector technology off-line chromatograph needs nitrogen, hydrogen, air three kinds of sources of the gas, and flame ionization ditector needs igniting to use, and there is potential safety hazard, be not suitable for the application carrying out on-the-spot express-analysis when being applied in substation field.And parallel shunt input mode needs manually to operate, be difficult to ensure that split ratio when at every turn operating is identical, also can the accuracy of impact analysis result.In addition, the gas chromatograph of dual-detector technology is bulky, heavier, safeguards cumbersome.
In sum, how simplify system principle and structure, the weight that reduces, the basis that reduces costs propose one is repeated, accuracy and sensitivity meets CNS and power industry standard, can simultaneously for Site Detection and applicable test in laboratory, the gas-chromatography detection method being suitable for large-scale promotion just becomes an important topic of electric power research worker.
Summary of the invention
For prior art Problems existing, the object of the invention is to: gas chromatograph and detection method that a kind of mineral dissolved gas analysis based on Solid Oxide Fuel Cell gas chromatography detector is provided, detector type is Solid Oxide Fuel Cell gas sensor, without the need to flammable explosive gas such as hydrogen as assisted gas, complete machine can move with car, can safety, stable, operate in substation field reliably, implement fast, dielectric oil chromatographic analysis accurately, avoid the gas escape that causes of long-distance transport process getting oil ring joint, thus improve efficiency and the precision of analysis of dielectric oil chromatographic analysis.
Oligodynamical gas analyzer and detection method in Portable mineral oil of the present invention, adopt the detection of single detecting device, two Coupled columns blowback input mode, ten-way valve is utilized to switch, double-colored spectrum realizes hydrogen, oxygen, carbon monoxide, methane, ethene, ethane, the separation of acetylene seven component combination gass.Once enter detecting device after each Component seperation of combination gas to detect, thus obtain each component gas concentration value.Complete machine instrument system comprises precision temperature control module, sample introduction and handover module, mixed gas separation module, feature gas detection module.
Further, described ten-way valve can simultaneously as sampling device and switching device shifter, connect two root chromatogram columns and sampling ring, and connect carrier gas gas circuit, under the promotion of carrier gas, the quantitative gas in sampling ring is sent in Solid Oxide Fuel Cell detecting device and detects.
Further, described precision temperature control module comprises heat transfer aluminium ingot, heating rod, solid-state relay, temperature sensor, temperature-control circuit system, control circuit system, by controlling the temperature of the Duty ratio control mixed gas separation module of solid-state relay, makes it maintain a steady state value.
Further, described mixed gas separation module comprises two root chromatogram columns and sampling ring, and chromatographic column is wrapped on the heat transfer aluminium ingot of precision temperature control module, and realizes the constant temperature that chromatogram lives by the constant temperature of heat transfer aluminium ingot.
Further, described feature gas detection module comprises thermocouple temperature sensor, heated quartz glass tube and heater strip, heat insulation cotton, Solid Oxide Fuel Cell detecting device body, its inlet end is connected with the endpiece of mixed gas separation module, under the promotion of carrier gas, the characteristic gas component to be detected of mixed gas separation module enters into characteristic gas detection module successively and detects.
In Portable Insulating Oil Breakdown Voltage of the present invention, oligodynamical gas analyzer and detection method have the following advantages compared with existing equipment and detection method:
One, only needs a kind of carrier gas can realize seven component analyses of Gases Dissolved in Transformer Oil.Traditional off-line red, orange, green, blue, yellow (ROGBY) needs three kinds of sources of the gas (nitrogen, hydrogen, air), and adopt hand gun sample injection method to analyze, system architecture is complicated, and cost is high, and troublesome maintenance.In Portable Insulating Oil Breakdown Voltage of the present invention, oligodynamical gas analyzer and detection method only need a kind of carrier gas of high pure nitrogen, assisted gas is done without the need to flammable explosive gas such as hydrogen, can safely, stable, long-play is at the scene of the large-scale oil-filled electric equipment such as power plant, transformer station, enormously simplify air supply system, simplify system architecture, reduce cost, realize the real time monitoring of transformer oil chromatographic, decrease oil sample transit link, ensure that real-time and the accuracy of analysis result.
Its two, adopt auto injection technology, improve system stability and reduce systematic error.Traditional off-line Dissolved Gases in Insulating Oil analytical approach owing to adopting two chromatographic column parallel-connection structure, gas sampling mode is generally " manually, parallel shunt " sample introduction.Above-mentioned sample injection method step is various, has higher requirement to operating personnel, and due to the operation technique of different personnel different, when it is to when carrying out testing same instrument, measurement result may be caused to there are differences because " split ratio " is different.In Portable Insulating Oil Breakdown Voltage of the present invention, oligodynamical gas analyzer and detection method utilize embedded computer technology to devise intelligent automation working routine, can automatically ventilate after start, temperature control, instrument is made to reach analysis state, analytical cycle is short, substantially increase the automatization level of instrument, ensure that the repeatability of sample introduction.
Its three, adopt single detector technologies.Utilize a detecting device, utilize the high sensitivity characteristic of solid ceramic oxide fuel cell detecting device, achieve the high accuracy analysis of oil dissolved gas especially acetylene, it reaches 0.1 μ L/L to the minimum detectable level of acetylene.
Accompanying drawing explanation
Fig. 1 is one-piece construction block diagram of the present invention;
Fig. 2 is baseline state process flow diagram of the present invention;
Fig. 3 is sample introduction state flow chart of the present invention.
Embodiment
As shown in Figure 1, oligodynamical gas analyzer and detection method in Portable mineral oil of the present invention, comprise casing 1, automatic sampling sample introduction mechanism 4, sample gas separating mechanism 2 and chromatogram testing agency 3 are set in casing 1, automatic sampling sample introduction mechanism 3 comprises ten-way valve 5, sampling ring 6, mixed gas separating mechanism mainly comprises rough segmentation chromatographic column 7, segmentation chromatographic column 8 and auxiliary pipeline and heat-preservation cotton, and mixed gas testing agency mainly comprises fuel cell chromatographic detector 9 and auxiliary pipeline.
As shown in Figure 2, during baseline state, carrier gas directly enters into segmentation chromatographic column 8 by ten-way valve 5, then by rough segmentation chromatographic column 7, the other end is connected to the input end of fuel cell chromatographic detector 9, the direct emptying of output terminal of fuel cell chromatographic detector 9, now injects sampling ring by sample gas, waits for baseline steadily rear sample introduction.
As shown in Figure 3, during sample introduction state, be full of mixed gas to be measured in sampling ring, rotate ten-way valve afterwards, sampling articulating enters carrier gas loop, segment the afterbody of post reverse graft to rough segmentation post, hydrogen, oxygen simultaneously, carbon monoxide, methane after the initial gross separation of rough segmentation post, then is separated further by segmentation post, and flows into detecting device detection.After methane goes out peak, switch ten-way valve, sampling ring resets, and before segmentation post is positioned at rough segmentation post, the ethene in rough segmentation post, ethane, acetylene continues to flow into detecting device and detects.The effect of segmentation post is mainly by hydrogen, and oxygen, carbon monoxide, methane Four composition is separated thoroughly, and due to ethene, ethane, acetylene is relatively easily separated, therefore its detachment process can complete in rough segmentation post.
The all operation of the present invention is all carried out control by embedded computer and is automatically realized, and avoids the interference of human factor, decreases the error of systematic analysis, improve the accuracy of analysis.
This for oligodynamical gas analyzer and detection method in the Portable mineral oil of voltage levels oil-filled electric equipment mineral insulation dissolved gas analysis according to above technical scheme, not only meet the examination criteria of domestic electrical industry to oil-filled electric equipment insulating oil testing laboratory, simultaneously to each component gas, especially hydrogen, acetylene has excellent sensitivity, not only increase the reliability that insulating oil detects analyser complete machine, the repeatability of measurement data and accuracy, simplify the hardware configuration of complete machine simultaneously, reduce volume, improve the gentle overall performance of Automated water, and reduce cost.Complete machine is lightweight, can move with car, is suitable for the Site Detection in intelligent substation repair based on condition of component project, can carry out large-scale promotion and application.
The Condition Monitoring Technology that this detection method is not only power industry provides strong technical support, is also that power transmission and transformation enterprise raising overall economic efficiency provides technical guarantee owing to having excellent cost performance simultaneously.It is to be noted and any distortion made according to the specific embodiment of the present invention all do not depart from the scope of spirit of the present invention and claim record.
Claims (5)
1. oligodynamical gas analyzer and detection method in Portable mineral oil, it is characterized in that: adopt the analysis of Solid Oxide Fuel Cell detecting device, two Coupled columns blowback sample introduction, the instrument system utilizing ten-way valve to carry out switching and detection method, analyze seven component bodies of solution gas in oil: hydrogen, carbon monoxide, methane, ethene, ethane, acetylene, instrument system comprises precision temperature control module, sample introduction and handover module, mixed gas separation module, feature gas detection module.
2. oligodynamical gas analyzer and detection method in Portable mineral oil according to claim 1, it is characterized in that, ten-way valve is simultaneously as sampling device and switching device shifter, connect two root chromatogram columns and sampling ring, and connect carrier gas gas circuit, under the promotion of carrier gas, the quantitative gas in sampling ring is sent in fuel cell chromatographic detector and detects.
3. oligodynamical gas analyzer and detection method in Portable mineral oil according to claim 2, it is characterized in that, described precision temperature control module comprises heat transfer aluminium ingot, heating rod, solid-state relay, temperature sensor, temperature-control circuit system, control circuit system, by controlling the temperature of the Duty ratio control mixed gas separation module of solid-state relay, makes it maintain a steady state value.
4. oligodynamical gas analyzer and detection method in Portable mineral oil according to claim 3, it is characterized in that, described mixed gas separation module comprises two root chromatogram columns and sampling ring, chromatographic column is wrapped on the heat transfer aluminium ingot of precision temperature control module, and realizes the constant temperature that chromatogram lives by the constant temperature of heat transfer aluminium ingot.
5. oligodynamical gas analyzer and detection method in Portable mineral oil according to claim 4, it is characterized in that, described feature gas detection module comprises thermocouple temperature sensor, heated quartz glass tube and heater strip, heat insulation cotton, Solid Oxide Fuel Cell detecting device body, its inlet end is connected with the endpiece of mixed gas separation module, under the promotion of carrier gas, the characteristic gas component to be detected of mixed gas separation module enters into characteristic gas detection module successively and detects.
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Cited By (7)
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| CN104977384A (en) * | 2015-06-24 | 2015-10-14 | 湖南大学 | Hydrogen and methane respiratory gas detection method |
| CN105758958A (en) * | 2016-03-01 | 2016-07-13 | 湖南大学 | Quick detector for hydrogen and methane components in respiratory air |
| CN106290590A (en) * | 2015-05-13 | 2017-01-04 | 湖南大学 | Minimum gas optoacoustic spectroscopy and chromatograph joint used instrument and the method for analysis in insulating oil |
| CN108169401A (en) * | 2018-01-17 | 2018-06-15 | 中国环境科学研究院 | A kind of countryside portable gas-detecting device and its operating method |
| CN109856302A (en) * | 2018-01-17 | 2019-06-07 | 中国环境科学研究院 | A kind of gas-detecting device and its operating method for benzene homologues |
| CN113984938A (en) * | 2021-12-29 | 2022-01-28 | 佛山速敏智能仪器科技有限公司 | Remove portable gas analysis chromatograph |
| CN114509472A (en) * | 2022-04-19 | 2022-05-17 | 佛山速敏智能仪器科技有限公司 | Gas detection system, detection method and gas detection device in transformer oil |
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Application publication date: 20150225 |