CN211955348U - Helium ionization gas chromatograph for analyzing dissolved gas in transformer oil - Google Patents
Helium ionization gas chromatograph for analyzing dissolved gas in transformer oil Download PDFInfo
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- CN211955348U CN211955348U CN202020129405.6U CN202020129405U CN211955348U CN 211955348 U CN211955348 U CN 211955348U CN 202020129405 U CN202020129405 U CN 202020129405U CN 211955348 U CN211955348 U CN 211955348U
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- 239000007789 gas Substances 0.000 title claims abstract description 134
- 239000001307 helium Substances 0.000 title claims abstract description 68
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 68
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000005520 cutting process Methods 0.000 claims abstract description 56
- 238000004458 analytical method Methods 0.000 claims abstract description 53
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 43
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 43
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 31
- 238000007664 blowing Methods 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 239000012159 carrier gas Substances 0.000 claims description 30
- 238000010926 purge Methods 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 23
- 238000012545 processing Methods 0.000 claims description 9
- 238000013022 venting Methods 0.000 claims description 6
- 238000004587 chromatography analysis Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000011208 chromatographic data Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000004868 gas analysis Methods 0.000 abstract description 10
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000002349 favourable effect Effects 0.000 abstract description 2
- -1 helium ion Chemical class 0.000 description 22
- 239000003570 air Substances 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 239000001257 hydrogen Substances 0.000 description 9
- 229910052739 hydrogen Inorganic materials 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000005070 sampling Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 5
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 2
- 229910001872 inorganic gas Inorganic materials 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- WFYPICNXBKQZGB-UHFFFAOYSA-N butenyne Chemical group C=CC#C WFYPICNXBKQZGB-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004573 interface analysis Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The utility model provides a helium ionization gas chromatograph that is arranged in transformer oil to dissolve gas analysis, include: the system comprises a gas cleaning and blowing system, a medium heavy hydrocarbon cutting and back blowing system, an air interference cutting system, a sample introduction system, a helium ion detector and a control system, wherein the gas cleaning and blowing system is communicated with the medium heavy hydrocarbon cutting and back blowing system; the medium heavy hydrocarbon cutting back-blowing system is respectively communicated with the air interference cutting system and the sample injection system; the air interference cutting system is communicated with the sample injection system; the sample introduction system is communicated with the helium ion detector. The utility model avoids the interference of high molecular hydrocarbons to low molecular hydrocarbons, improves the efficiency of continuous sample analysis, and improves the reliability and repeatability of sample analysis results; meanwhile, the helium ion detector has wide analysis range and high detection limit sensitivity, is favorable for timely finding out internal faults of detection equipment, enables the equipment with latent faults to be repaired in a planned and economical manner, and avoids equipment damage and unplanned power failure.
Description
Technical Field
The utility model relates to a transformer technical field particularly, relates to a helium ionization gas chromatograph that is arranged in transformer oil to dissolve gas analysis.
Background
At present, the transformer is the most important equipment in a power system and has very wide application. The insulating oil and the organic insulating material in the transformer are gradually aged and decomposed by heat and electricity over a long period of time with the increase of operation time, and generate a very small amount of gas, and the gas dissolved in the oil includes hydrogen, methane, ethylene, ethane, acetylene, carbon monoxide, carbon dioxide, and the like. However, when a fault occurs inside the transformer, the content of gas in the oil is greatly changed. As the failure progresses, when the gas production is greater than the dissolved amount, a portion of the gas is released as free gas. Practice has proved that most of the initial defects of the transformer show early signs, so that the internal faults of the transformer can be discovered as early as possible by measuring and analyzing the content of gas dissolved in oil.
At present, a common division method is that a gas chromatograph is provided with three detectors, namely a hydrogen flame ionization detector and a thermal conductivity cell detector; the problems with this approach are: the types of working gases need to be provided with three detectors of nitrogen, hydrogen and air, the types are multiple, and the safety coefficient is low; the related detectors have various types, complex structure and difficult maintenance; the analysis range is narrow, and the universality is poor: thermal Conductivity Detectors (TCDs) respond to all substances, but have low sensitivity; flame Ion Detectors (FIDs) respond to almost all organic species, but they cannot be used to analyze inorganic species and permanent gases; the detection sensitivity is low, and potential problems are not found timely.
Therefore, a helium ionized gas chromatograph is needed to solve the above problems.
Disclosure of Invention
In view of this, the utility model provides a helium ionization gas chromatograph for solution gas analysis in transformer oil aims at solving the problem that improves the continuous sample analysis's of helium ionization gas chromatograph efficiency.
In one aspect, the utility model provides a helium ionization gas chromatograph for solution gas analysis in transformer oil, include: the system comprises a gas cleaning and blowing system, a medium heavy hydrocarbon cutting and back blowing system, an air interference cutting system, a sample feeding system, a helium ion detector and a control system, wherein the gas cleaning and blowing system is communicated with the medium heavy hydrocarbon cutting and back blowing system; the medium heavy hydrocarbon cutting and back blowing system is respectively communicated with the air interference cutting system and the sample injection system; the air interference cutting system is communicated with the sample feeding system; the sample introduction system is communicated with the helium ion detector; the control system is respectively and electrically connected with the gas cleaning and blowing system, the medium heavy hydrocarbon cutting and back blowing system, the air interference cutting system, the sample introduction system and the helium ion detector; wherein,
the control system comprises a gas chromatograph central controller, a chromatographic data processing control workstation and a chromatographic analysis database, wherein the gas chromatograph central controller is used for controlling the actions of the gas cleaning and purging system, the medium heavy hydrocarbon cutting and back flushing system and the air interference cutting system;
the gas cleaning and blowing system comprises a six-way valve, and the medium heavy hydrocarbon cutting and back blowing system comprises two ten-way valves, namely a first ten-way valve and an twentieth-way valve.
Further, No. 1 port and the introduction port intercommunication of six-way valve, No. 2 ports of six-way valve are used for the gas unloading, No. 3 ports of six-way valve with No. 1 port intercommunication of twenty-way valve, No. 4 ports of six-way valve with No. 2 ports intercommunication of twenty-way valve, No. 5 ports of six-way valve with No. 2 ports intercommunication of first ten-way valve, No. 6 ports of six-way valve with No. 1 port intercommunication of first ten-way valve.
Furthermore, the port 1 of the six-way valve is communicated with a purging helium branch, and the sample inlet is arranged on the purging helium branch.
Further, a pressure stabilizing valve is further arranged on the purging helium branch circuit, and the pressure stabilizing valve is arranged between the port 1 of the six-way valve and the sample inlet.
Furthermore, a port 3 of the first ten-way valve is communicated with a port 10 of the first ten-way valve through a first quantitative ring, a port 4 of the first ten-way valve is communicated with first carrier gas, a port 5 of the first ten-way valve is communicated with a port 9 of the first ten-way valve through a first chromatographic column, a port 6 of the first ten-way valve is communicated with the air interference cutting system, a port 7 of the first ten-way valve is communicated with second carrier gas, and a port 8 of the first ten-way valve is used for emptying the sample.
Furthermore, No. 3 port of the twentieth valve is communicated with No. 10 port of the twentieth valve through a second quantitative ring, No. 4 port of the twentieth valve is communicated with a third carrier gas, No. 5 port of the twentieth valve is communicated with No. 9 port of the twentieth valve through an analytical column, No. 6 port of the twentieth valve is used for emptying samples, No. 7 port of the twentieth valve is communicated with a fourth carrier gas, and No. 8 port of the twentieth valve is communicated with the sample injection system.
Further, the air interference cutting system comprises a first four-way valve, a port 1 of the first four-way valve is communicated with the sample injection system, a port 2 of the first four-way valve is communicated with fifth carrier gas, a port 3 of the first four-way valve is used for emptying the sample, and a port 4 of the first four-way valve is communicated with a port 6 of the first ten-way valve through a first 5A analysis column.
Further, sampling system includes the second cross valve, No. 1 mouth of second cross valve with No. 1 mouth of first cross valve passes through second 5A analytical column intercommunication, No. 2 mouths of second cross valve with helium ion detector intercommunication, No. 3 mouths of second cross valve with No. 8 mouths of twentieth cross valve are linked together through the second chromatographic column, No. 4 mouths of second cross valve are used for the sample to empty.
Compared with the prior art, the helium ionized gas chromatograph for analyzing the dissolved gas in the transformer oil has the advantages that the helium ionized gas chromatograph avoids the interference of high molecular hydrocarbons on low molecular hydrocarbons, improves the efficiency of continuous sample analysis, and improves the reliability and the repeatability of sample analysis results; meanwhile, the helium ion detector has wide analysis range and high detection limit sensitivity, is favorable for timely finding out internal faults of detection equipment, enables the equipment with latent faults to be repaired in a planned and economical manner, and avoids equipment damage and unplanned power failure.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a helium ionization gas chromatograph for analyzing dissolved gas in transformer oil according to an embodiment of the present invention;
fig. 2 is a schematic view of a connection structure in a first working state according to an embodiment of the present invention;
fig. 3 is a schematic view of a second working state connection structure provided by the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, the present embodiment provides a helium ionization gas chromatograph for analysis of dissolved gas in transformer oil, comprising: the device comprises a gas cleaning and purging system 2, a medium heavy hydrocarbon cutting and back blowing system 3, an air interference cutting system 4, a sampling system 5, a helium ion detector 12 and a control system 1, wherein the gas cleaning and purging system 2 is communicated with the medium heavy hydrocarbon cutting and back blowing system 3; the medium heavy hydrocarbon cutting and back-blowing system 3 is respectively communicated with the air interference cutting system 4 and the sample injection system 5; the air interference cutting system 4 is communicated with the sample injection system 5; the sample introduction system 5 is communicated with a helium ion detector 12; the control system 1 is respectively and electrically connected with the gas cleaning and purging system 2, the medium heavy hydrocarbon cutting and back blowing system 3, the air interference cutting system 4, the sampling system 5 and the helium ion detector 12.
Specifically, control system 1 includes gas chromatograph central controller, chromatogram data processing control workstation, communication interface and chromatographic analysis database, and gas chromatograph central controller is used for controlling the action of gaseous washing purge system 2, well heavy hydrocarbon cutting blowback system 3 and air interference cutting system 4, and communication interface is used for being connected with external equipment to carry out communication and data transmission.
Specifically, the gas chromatograph central controller is an automated gas chromatograph central controller, the communication interface is a networking and data communication interface, and the chromatographic data processing control workstation is an automated chromatographic data processing control workstation.
Specifically, the helium ionization gas chromatograph adopts an embedded technology, a software component technology and a networking technology to realize the integration of the gas chromatography control system 1 in the control and processing analysis processes, so that the integrity of the whole sample analysis from analysis flow control, data acquisition, chromatography processing and analysis, statistical report forms and the like is stronger.
It can be seen that the helium ionized gas chromatograph for analyzing the dissolved gas in the transformer oil in the embodiment avoids the interference of high molecular hydrocarbons on low molecular hydrocarbons, improves the efficiency of continuous sample analysis, and improves the reliability and repeatability of sample analysis results; meanwhile, the helium ion detector 12 is wide in analysis range and high in detection limit sensitivity, internal faults of detection equipment can be found timely, the equipment with latent faults can be repaired in a planned and economical mode, and damage to the equipment and unplanned power failure are avoided.
Specifically, as shown in fig. 2 and 3, the gas cleaning and purging system 2 includes a six-way valve 7, the six-way valve 7 is provided with ports 1 to 6, the medium heavy hydrocarbon cutting and back flushing system 3 includes two ten-way valves, the ten-way valves are provided with ports 1 to 10, and the two ten-way valves are a first ten-way valve 8 and a twentieth-way valve 9, respectively.
Specifically, No. 1 port of the six-way valve 7 is communicated with the sample inlet 13, No. 2 port of the six-way valve 7 is used for gas venting, that is, No. 2 port of the six-way valve 7 is communicated with a gas venting branch to perform gas venting, No. 3 port of the six-way valve 7 is communicated with No. 1 port of the twenty-way valve 9, No. 4 port of the six-way valve 7 is communicated with No. 2 port of the twentieth-way valve 9, No. 5 port of the six-way valve 7 is communicated with No. 2 port of the first ten-way valve 8, and No. 6 port of the six-way valve 7 is communicated with No. 1 port of the first ten-way valve 8.
Specifically, a port 1 of the six-way valve 7 is communicated with a purging helium branch, the purging helium branch is used for inputting purging helium into the port 1 of the six-way valve 7, and the sample inlet 13 is arranged on the purging helium branch; and a pressure stabilizing valve 14 is further arranged on the purging helium branch circuit, and the pressure stabilizing valve 14 is arranged between the port 1 of the six-way valve 7 and the sample inlet 13, namely, the pressure stabilizing valve 14 is arranged on the purging helium branch circuit and is positioned between the port 1 of the six-way valve 7 and the sample inlet 13.
Specifically, a port 3 of the first ten-way valve 8 is communicated with a port 10 of the first ten-way valve 8 through a first quantitative ring 15, a communicating air passage is arranged between the port 3 of the first ten-way valve 8 and the port 10 of the first ten-way valve 8, and the first quantitative ring 15 is arranged on the communicating air passage; a port 4 of the first ten-way valve 8 is communicated with a first carrier gas He1, a port 5 of the first ten-way valve 8 is communicated with a port 9 of the first ten-way valve 8 through a first chromatographic column 16, a communicating gas path is arranged between the port 5 of the first ten-way valve 8 and the port 9 of the first ten-way valve 8, and the first chromatographic column 16 is arranged on the communicating gas path; the port 6 of the first ten-way valve 8 is communicated with the air interference cutting system 4, the port 7 of the first ten-way valve 8 is communicated with the second carrier gas He2, and the port 8 of the first ten-way valve 8 is used for emptying the sample.
Preferably, the first chromatographic column 16 is preferably a HayesepQ analytical column.
Specifically, a port 3 of the twentieth through valve 9 is communicated with a port 10 of the twentieth through valve 9 through a second quantitative ring 21, a communicating gas path is arranged between the port 3 of the twentieth through valve 9 and the port 10 of the twentieth through valve 9, and the second quantitative ring 21 is arranged on the communicating gas path; a port 4 of the twentieth valve 9 is communicated with a third carrier gas He3, a port 5 of the twentieth valve 9 is communicated with a port 9 of the twentieth valve 9 through an analytical column 20, a communicating gas path is arranged between the port 5 of the twentieth valve 9 and the port 9 of the twentieth valve 9, and the analytical column 20 is arranged on the communicating gas path; the No. 6 port of the twentieth through valve 9 is used for emptying the sample, the No. 7 port of the twentieth through valve 9 is communicated with the fourth carrier gas He4, and the No. 8 port of the twentieth through valve 9 is communicated with the sample injection system 5.
Specifically, the air interference cutting system 4 includes a first four-way valve 10, a port 1-4 is arranged on the first four-way valve 10, a port 1 of the first four-way valve 10 is communicated with a sample injection system 5, a port 2 of the first four-way valve 10 is communicated with a fifth carrier gas He5, a port 3 of the first four-way valve 10 is used for emptying samples, a port 4 of the first four-way valve 10 is communicated with a port 6 of a first ten-way valve 8 through a first 5A analytical column 17, a communication air passage is arranged between the port 4 of the first four-way valve 10 and the port 6 of the first ten-way valve 8, and the first 5A analytical column 17 is arranged on the communication air passage.
Specifically, the sample introduction system 5 comprises a second four-way valve 11, a port 1-4 is arranged on the second four-way valve 11, the port 1 of the second four-way valve 11 is communicated with the port 1 of the first four-way valve 10 through a second 5A analytical column 18, a communicating gas path is arranged between the port 1 of the second four-way valve 11 and the port 1 of the first four-way valve 10, and the second 5A analytical column 18 is arranged on a communicating gas path; a port 2 of the second four-way valve 11 is communicated with the helium ion detector 12, a port 3 of the second four-way valve 11 is communicated with a port 8 of the twentieth through valve 9 through a second chromatographic column 19, a communicating gas path is arranged between the port 3 of the second four-way valve 11 and the port 8 of the twentieth through valve 9, and the second chromatographic column 19 is arranged on the communicating gas path; port 4 of the second four-way valve 11 is used for sample emptying.
Preferably, the second chromatography column 19 is a HayesepQ analytical column.
The helium ionized gas chromatograph for analyzing the dissolved gas in the transformer oil needs few types of working gas and is high in safety coefficient. The helium ionized gas chromatograph is provided with a valve center cutting and back flushing technology, and can realize 9 components (H) of dissolved gas in transformer oil2、O2、N2、CH4、C2H6、C2H4、C2H2、CO、CO2) Separation and determination of (a); the detection limit of each component reaches 10-9 orders of magnitude, the peak signal value of the detector is greatly enhanced, the detection limit is respectively improved by 5-80 times, hydrogen is not needed as auxiliary gas, and potential safety hazards are reduced.
Meanwhile, the helium ionization gas chromatograph for analyzing the dissolved gas in the transformer oil is simple and convenient to operate, and is provided with a back flushing system for components C3+ and above in a transformer oil sample, wherein the system comprises two ten-way valves, two four-way valves, one purging valve and a helium ion detector 12. The utility model discloses convenient operation, factor of safety is high, detects the limit and can reach 5ppb level, has solved sample gas influence each other simultaneously, oil deviate from the difficult problem of other impurity interference tests in the gas to instrument stability time is short, and the measuring accuracy is high.
In specific implementation, when the transformer insulating oil is heated or high-energy discharge occurs in oil filling equipment, the insulating oil can be cracked to generate hydrogen or low-molecular hydrocarbon characteristic gasThe analysis of the characteristic gas can detect the failure of the equipment at an early stage. The commonly used characteristic gases are mainly: methane CH4Ethylene C2H4Ethane C2H6Acetylene C2H2 and the like. However, C may be contained in the actual insulating oil decomposition product3、C4Higher molecular hydrocarbons, e.g. propylene C3H6Propane C3H8Vinyl acetylene C4H4And the like. When a traditional gas chromatography analyzer is configured to analyze an insulating oil sample, the larger the number of macromolecular hydrocarbon molecules contained in the sample is, the longer the retention time in a chromatographic column is. If all hydrocarbons are discharged at a lower column temperature, such as 60 ℃, it takes about one hour, which seriously affects the analysis efficiency. If the sample is continuously injected after the low molecular hydrocarbon is separated, problems such as overlapping of the high molecular hydrocarbon sample and the low molecular hydrocarbon sample at the time of the previous time and the like occur, and the analysis result is influenced.
It can be understood that the helium ionized gas chromatograph for analyzing the dissolved gas in the transformer oil avoids the interference of high molecular hydrocarbons on low molecular hydrocarbons, improves the efficiency of continuous sample analysis, and improves the reliability and repeatability of sample analysis results; meanwhile, the helium ion detector 12 is wide in analysis range and high in detection limit sensitivity, internal faults of detection equipment can be found timely, the equipment with latent faults can be repaired in a planned and economical mode, and damage to the equipment and unplanned power failure are avoided.
Specifically, in the above embodiment, referring to fig. 2, the analysis flow of the gas chromatograph is as follows: the sample gas sequentially enters a port 1 of the six-way valve 7, a port 6 of the six-way valve 7, a port 1 of the first ten-way valve 8, a port 10 of the first ten-way valve 8, a first quantitative ring 15, a port 3 of the first ten-way valve 8, a port 2 of the first ten-way valve 8, a port 5 of the six-way valve 7, a port 4 of the six-way valve 7, a port 2 of the twenty-way valve 9, a port 3 of the twenty-way valve 9, a second quantitative ring 21, a port 10 of the twenty-way valve 9 and a port 1 of the twenty-way valve 9, and the first ten-way valve 8 and the sampling twenty-way valve 9 are controlled by software built in a central controller of the gas chromatograph to realize sample collection.
Further, as shown in fig. 3, after the gas chromatograph central controller controls and switches the first ten-way valve 8, the sample sequentially enters the port 10 of the first ten-way valve 8, the port 9 of the first ten-way valve 8, the first chromatographic column 16, the port 5 of the first ten-way valve 8, the port 6 of the first ten-way valve 8, and the first 5A analytical column 17 through the first quantitative ring 15, the interference of air in a large amount of sample gas is eliminated by controlling and switching the first four-way valve 10 through the gas chromatograph central controller, and then the sample gas to be analyzed enters the helium ion detector 12(PDD) through the second 5A analytical column 18, the port 1 of the second four-way valve 11, and the port 2 of the second four-way valve 11 to perform inorganic gas analysis.
Further, as shown in fig. 2 and 3, the organic gas analysis process is as follows: the sample gas sequentially enters the port 9 of the twentieth through valve 9, the analytical column 20, the port 5 of the twentieth through valve 9, and the port 6 of the twentieth through valve 9 through the second quantitative ring 21, the twentieth through valve 9 is switched after the inorganic gas analyzed by the first ten-way through valve 8 is exhausted, the sample gas sequentially enters the port 5 of the twentieth through valve 9, the analytical column 20, the port 9 of the twentieth through valve 9, the port 8 of the twentieth through valve 9, the port 3 of the second four-way through valve 11, the port 2 of the second four-way through valve 11, and finally enters the helium ion detector 12(PDD) through the port 2 of the second four-way through valve 11 for analysis.
Specifically, in the above embodiment, referring to fig. 2, the sampling flow of the sample gas is as follows: after passing through the port 1 of the six-way valve 7 and the port 6 of the six-way valve 7, the sample gas enters the port 1 of the first ten-way valve 8, the port 10 of the first ten-way valve 8, the first quantitative ring 15, the port 3 of the first ten-way valve 8 and the port 2 of the first ten-way valve 8, and then enters the port 2 of the twenty-way valve 9, the port 3 of the twenty-way valve 9, the second quantitative ring 21, the port 10 of the twenty-way valve 9 and the port 1 of the twenty-way valve 9 through the port 5 of the six-way valve 7 and the port 4 of the six-way valve 7, and then the sample gas flows through the port 3 of the six-way valve 7 and the port 2 of the six-way valve 7 to be discharged, so that the sample gas is subjected to displacement sampling in the above flow paths, and the measured sample is filled in the whole sampling system in real time.
Specifically, in the embodiment, referring to fig. 3, a first sample gas injection flow is as follows: all valves in the analysis system adopt an embedded technology and a software component technology, and automatically operate and switch after parameters are set by a computer, namely, the valves are automatically controlled by a central controller of a gas chromatograph. After the sample gas is replaced for 0.5 minute in the system according to the sampling process, the process is as follows: the six-way valve 7 is changed from the state of fig. 2 to the state of fig. 3, at this time, the states of the first ten-way valve 8 and the twenty-way valve 9 are not changed, the samples sampled by the first quantitative ring 15 and the second quantitative ring 21 in the first ten-way valve 8 and the twenty-way valve 9 are respectively intercepted in the first quantitative ring 15 and the second quantitative ring 21, the samples are controlled by the central controller of the gas chromatograph according to the analysis requirements, after 0.1min, the first ten-way valve 8 acts, and the first carrier gas He1 drives the samples to pass through the port 4 of the sample injection first ten-way valve 8, the port 3 of the first ten-way valve 8, the first quantitative ring 15, the port 10 of the first ten-way valve 8, and the port 9 of the first ten-way valve 8 to enter the first chromatographic column 16 for analysis process.
Specifically, in the embodiment, as shown in fig. 2 and 3, the first flow of sample gas analysis: the first carrier gas He1 carries the sample gas to enter the first chromatographic column 16 through the No. 4 port of the first ten-way valve 8, the No. 3 port of the first ten-way valve 8, the first quantitative ring 15, the No. 10 port of the first ten-way valve 8 and the No. 9 port of the first ten-way valve 8, the sample gas is preliminarily separated, when hydrogen, oxygen, nitrogen, methane and carbon monoxide enter the first 5A analytical column 17 and carbon dioxide does not flow out, the first ten-way valve 8 is reset, at this time, the second carrier gas He2 passes through the No. 7 port of the first ten-way valve 8, the No. 6 port of the first ten-way valve 8, the first 5A analytical column 17, the No. 4 port of the first four-way valve 10 and the No. 1 port of the first four-way valve 10, when hydrogen flows out of the first four-way valve 10 after 0.4min, the first four-way valve 10 is switched to the state shown in the figure 3, after the oxygen and nitrogen are emptied, the first four-way valve 10 is reset, and methane and carbon monoxide enter the second 5A analytical column, the helium ion detector 12 (the state of the second four-way valve 11 shown in fig. 2) is entered through port 1 of the second four-way valve 11 and port 2 of the second four-way valve 11.
Specifically, in the embodiment, as shown in fig. 3, the sample gas injection flow is a second flow: after waiting for 5min, after the sample gas analysis process is finished, the twentieth valve 9 is switched to the state shown in fig. 3, and the third carrier gas He3 drives the sample gas to pass through the port 4 of the twentieth valve 9, the port 3 of the twentieth valve 9, the second quantifying ring 21, the port 10 of the twentieth valve 9 and the port 9 of the twentieth valve 9 to enter the pre-column for analysis process
Specifically, in the embodiment, as shown in fig. 3, the second flow of sample gas analysis: the third carrier gas He3 carries the sample gas into the analytical column 20 through the port 4 of the twentieth valve 9, the port 3 of the twentieth valve 9, the second quantitative ring 21, the port 10 of the twentieth valve 9 and the port 9 of the twentieth valve 9, preliminarily separating the sample gas, after 0.2min, when hydrogen, oxygen, nitrogen, methane and carbon monoxide flow out and carbon dioxide, ethane, ethylene and acetylene do not flow out, resetting the twentieth valve 9 to the state in figure 2, at this time, the third carrier gas He3 carries the carbon dioxide and ethane which have not flowed out, and the ethylene and the acetylene enter the helium ion detector 12 through the port 4 of the twentieth valve 9, the port 5 of the twentieth valve 9, the analytical column 20, the port 9 of the twentieth valve 9, the port 8 of the twentieth valve 9, the second chromatographic column 19, the port 3 of the second four-way valve 11, and the port 2 of the second four-way valve 11 to be analyzed.
Specifically, in the above example, and in conjunction with FIG. 3, the heavy hydrocarbon blowdown process is as follows: after 6min, when the component C2 enters the second chromatographic column 19 and the heavy hydrocarbon component above C3+ does not flow out of the analytical column 20, the valve 5 is switched to the state shown in fig. 3, the fourth carrier gas He4 carries carbon dioxide and ethane, and ethylene and acetylene enter the helium ion detector 12 through the port 7 of the twentieth through valve 9, the port 8 of the twentieth through valve 9, the second chromatographic column 19, the port 3 of the second four-way through valve 11 and the port 2 of the second four-way through valve 11; the heavy hydrocarbon components above C3+ are discharged from a third carrier gas He3 through a port 4 of the twentieth valve 9, a port 3 of the twentieth valve 9, a second quantitative ring 21, a port 10 of the twentieth valve 9, a port 9 of the twentieth valve 9, an analytical column 20, a port 5 of the twentieth valve 9 and a port 6 of the twentieth valve 9.
Specifically, in the embodiment, referring to fig. 2, the sample gas purging flow includes: after the sample gas analysis process is finished and enters the next analysis process, purging work of the first quantitative ring 15 and the second quantitative ring 21 is performed, and after the purging helium passes through the port 1 of the six-way valve 7 and the port 6 of the six-way valve 7, enters the port 1 of the first ten-way valve 8, the port 10 of the first ten-way valve 8, the first quantitative ring 15, the port 3 of the first ten-way valve 8 and the port 2 of the first ten-way valve 8, and then enters the port 2 of the twenty-way valve 9, the port 3 of the twenty-way valve 9, the second quantitative ring 21, the port 10 of the twenty-way valve 9 and the port 1 of the twenty-way valve 9, and then flows through the port 3 of the six-way valve 7 and the port 2 of the six-way valve 7 to be vented.
Specifically, in the above embodiment, referring to fig. 2, the air interference cutting process in the sample gas includes: after passing through the port 7 of the first ten-way valve 8, the port 6 of the first ten-way valve 8, the first 5A analytical column 17, the port 4 of the first four-way valve 10 and the port 1 of the first four-way valve 10 for 0.4min, when hydrogen flows out of the first four-way valve 10, the first four-way valve 10 is switched to the state shown in the figure 3, oxygen and nitrogen are discharged through the port 4 of the first four-way valve 10 and the port 3 of the first four-way valve 10, after 1.4min, the first four-way valve 10 is reset to the state shown in the figure 1, methane and carbon monoxide enter the second 5A analytical column 18 for further separation, and enter the helium ion detector 12 for analysis through the port 1 of the second four-way valve 11 and the port 2 of the second four-way valve 11.
Specifically, in the embodiment, as shown in fig. 3, the first cutting process is as follows: the first carrier gas He1 is used for emptying heavy hydrocarbon components and carbon dioxide above C3+ by a port 4 of the first ten-way valve 8, a port 5 of the first ten-way valve 8, the first chromatographic column 16, a port 9 of the first ten-way valve 8 and a port 8 of the first ten-way valve 8 to complete the cutting and back blowing process.
Specifically, in the embodiment, as shown in fig. 3, the second cutting process is as follows: and the third carrier gas He3 is discharged through the port 4 of the twentieth through valve 9, the port 3 of the twentieth through valve 9, the second quantitative ring 21, the port 10 of the twentieth through valve 9, the port 9 of the twentieth through valve 9, the analytical column 20, the port 5 of the twentieth through valve 9 and the port 6 of the twentieth through valve 9, so that the process of cutting the heavy hydrocarbon components with the weight of more than C3+ is completed.
Specifically, in the embodiment, as shown in fig. 3, the center cutting process includes: when the sample gas contains a large amount of oxygen and nitrogen, redundant oxygen and nitrogen are discharged through the port 7 of the first ten-way valve 8, the port 6 of the first ten-way valve 8, the first 5A analysis column 17, the port 4 of the first four-way valve 10 and the port 3 of the first four-way valve 10, so that redundant oxygen and nitrogen in the sample gas are eliminated, interference of the redundant oxygen and nitrogen on sample analysis is avoided, and the accuracy of analysis results is improved.
Specifically, in the embodiment described above, in conjunction with fig. 2 and 3, switching of the helium ion detector 12: when the first ten-way valve 8 is used for sample analysis, analysis gas enters the helium ion detector 12 through the port 1 of the second four-way valve 11 and the port 2 of the second four-way valve 11 for sample analysis; when the sample injection analysis of the twentieth through valve 9 is performed, the second four-way valve 11 is switched, and the analysis gas enters the helium ion detector 12 through the port 3 of the second four-way valve 11 and the port 11 of the second four-way valve for sample analysis.
The helium ionization detector gas chromatograph in the above embodiment is provided with one six-way valve 7 for purging, two ten-way valves for sample injection, namely a first ten-way valve 8 and a twenty-way valve 9, and two four-way valves for cutting, namely a first four-way valve 10 and a second four-way valve 11; the six-way valve 7 is used for purging and replacing residual samples of the quantitative tube during purging and manual sample introduction of the quantitative ring on the two sample introduction valves, namely the first ten-way valve 8 and the twentieth-way valve 9, and locking trace samples in the quantitative ring after sample introduction so as to exchange sample introduction analysis between the two ten-way valves for sample introduction; the first ten-way valve 8 is used for sample injection, cutting and back blowing, H2、O2、N2、CH4When entering the first four-way valve 10, the first ten-way valve 8 empties the rest components; when O in the sample2、N2When the content is high, the first four-way valve 10 performs center cutting to reduce and avoid the influence on the analysis, and the second four-way valve 11 is used as a detector of a sample injection valve; the twentieth valve 9 is used for sampling, cutting and analyzing SF6\C2\CO2。
Therefore, the helium ionized gas chromatograph for analyzing the dissolved gas in the transformer oil avoids the interference of high molecular hydrocarbons on low molecular hydrocarbons, improves the efficiency of continuous sample analysis, and improves the reliability and the repeatability of sample analysis results; meanwhile, the helium ionization detector is wide in analysis range and high in detection limit sensitivity, internal faults of detection equipment can be found timely, the equipment with latent faults can be overhauled in a planned and economical mode, and damage to the equipment and unplanned power failure are avoided.
Specifically, the above-described first carrier gas He1, second carrier gas He2, third carrier gas He3, fourth carrier gas He4, and fifth carrier gas He5 are preferably helium.
Specifically, the gas chromatograph central controller is configured to control actions of the six-way valve 7, the first ten-way valve 8, the twentieth valve 9, the first four-way valve 10, and the second four-way valve 11, that is, the gas chromatograph central controller is configured to control state switching of the six-way valve 7, the first ten-way valve 8, the twentieth valve 9, the first four-way valve 10, and the second four-way valve 11.
Specifically, the gas chromatograph central controller includes a processing unit, and the processing unit outputs a switching control command.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A helium-ionized gas chromatograph for analysis of dissolved gas in transformer oil, comprising: the system comprises a gas cleaning and blowing system, a medium heavy hydrocarbon cutting and back blowing system, an air interference cutting system, a sample feeding system, a helium ion detector and a control system, wherein the gas cleaning and blowing system is communicated with the medium heavy hydrocarbon cutting and back blowing system; the medium heavy hydrocarbon cutting and back blowing system is respectively communicated with the air interference cutting system and the sample injection system; the air interference cutting system is communicated with the sample feeding system; the sample introduction system is communicated with the helium ion detector; the control system is respectively and electrically connected with the gas cleaning and blowing system, the medium heavy hydrocarbon cutting and back blowing system, the air interference cutting system, the sample introduction system and the helium ion detector; wherein,
the control system comprises a gas chromatograph central controller, a chromatographic data processing control workstation and a chromatographic analysis database, wherein the gas chromatograph central controller is used for controlling the actions of the gas cleaning and purging system, the medium heavy hydrocarbon cutting and back flushing system and the air interference cutting system;
the gas cleaning and blowing system comprises a six-way valve, and the medium heavy hydrocarbon cutting and back blowing system comprises two ten-way valves, namely a first ten-way valve and an twentieth-way valve.
2. A helium ionization gas chromatograph for analysis of dissolved gas in transformer oil as claimed in claim 1 wherein port 1 of the six way valve communicates with a sample inlet, port 2 of the six way valve is for gas venting, port 3 of the six way valve communicates with port 1 of the twenty way valve, port 4 of the six way valve communicates with port 2 of the twenty way valve, port 5 of the six way valve communicates with port 2 of the first ten way valve, port 6 of the six way valve communicates with port 1 of the first ten way valve.
3. A helium-ionized gas chromatograph for analysis of dissolved gas in transformer oil as defined in claim 2 wherein port No. 1 of the six-way valve communicates with a purge helium branch on which the sample inlet is disposed.
4. A helium ionized gas chromatograph for analysis of dissolved gas in transformer oil as defined in claim 3 wherein a pressure maintaining valve is further disposed on the purge helium branch, the pressure maintaining valve being disposed between port 1 of the six-way valve and the sample inlet.
5. A helium ionized gas chromatograph for analysis of dissolved gases in transformer oil as defined in claim 2 wherein port 3 of the first ten way valve is in communication with port 10 of the first ten way valve through a first dosing ring, port 4 of the first ten way valve is in communication with a first carrier gas, port 5 of the first ten way valve is in communication with port 9 of the first ten way valve through a first chromatographic column, port 6 of the first ten way valve is in communication with the air interference cutting system, port 7 of the first ten way valve is in communication with a second carrier gas, port 8 of the first ten way valve is used for sample evacuation.
6. A helium ionized gas chromatograph for analysis of dissolved gas in transformer oil as defined by claim 5 wherein port 3 of said twenty-way valve is in communication with port 10 of said twenty-way valve through a second dosing ring, port 4 of said twenty-way valve is in communication with a third carrier gas, port 5 of said twenty-way valve is in communication with port 9 of said twenty-way valve through an analytical column, port 6 of said twenty-way valve is used for sample evacuation, port 7 of said twenty-way valve is in communication with a fourth carrier gas, and port 8 of said twenty-way valve is in communication with said sample injection system.
7. A helium ionized gas chromatograph for analysis of dissolved gases in transformer oil as claimed in claim 6 wherein said air interference cutting system comprises a first four way valve with port 1 in communication with said sample injection system, port 2 in communication with a fifth carrier gas, port 3 in said first four way valve for sample venting, port 4 in said first four way valve in communication with port 6 in said first ten way valve through a first 5A analytical column.
8. A helium ionized gas chromatograph for analysis of dissolved gas in transformer oil as defined in claim 7 wherein the sample injection system comprises a second four-way valve having port 1 in communication with port 1 of the first four-way valve via a second 5A analytical column, port 2 of the second four-way valve in communication with the helium ion detector, port 3 of the second four-way valve in communication with port 8 of the twentieth valve via a second chromatographic column, port 4 of the second four-way valve being used for sample venting.
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| CN114705628A (en) * | 2022-04-06 | 2022-07-05 | 西安交通大学 | Transformer oil gas detection system and method with high anti-interference capability |
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| CN114705628A (en) * | 2022-04-06 | 2022-07-05 | 西安交通大学 | Transformer oil gas detection system and method with high anti-interference capability |
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