CN114486810B - Oil sample oil mixing system based on multicomponent gas marking system and detection method - Google Patents
Oil sample oil mixing system based on multicomponent gas marking system and detection method Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 90
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 238000007872 degassing Methods 0.000 claims abstract description 65
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 claims abstract description 51
- 230000001502 supplementing effect Effects 0.000 claims abstract description 28
- 239000003921 oil Substances 0.000 claims description 189
- 230000003068 static effect Effects 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000010724 circulating oil Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 228
- 239000000306 component Substances 0.000 description 16
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- KEUKAQNPUBYCIC-UHFFFAOYSA-N ethaneperoxoic acid;hydrogen peroxide Chemical compound OO.CC(=O)OO KEUKAQNPUBYCIC-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000004847 absorption spectroscopy Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention discloses an oil sample oil mixing system and a detection method based on a multi-component gas marking system, wherein the oil sample oil mixing system comprises a gas distribution system and an oil mixing system; the oil mixing system comprises an oil supplementing pump, an oil marking oil tank, a gas-liquid mixing pump, a venturi jet device and a degassing loop pump, wherein the oil supplementing pump is connected with the gas-liquid mixing pump inlet through a pipeline, the oil marking tank is connected with the gas-liquid mixing pump inlet and the venturi jet device air inlet through a pipeline, the gas-liquid mixing pump outlet is connected with the oil marking oil tank inlet through a pipeline, the oil marking oil tank outlet is connected with the venturi jet device oil inlet through a pipeline, the venturi jet device outlet is connected with the gas-liquid mixing pump inlet through a pipeline, the oil marking oil tank is further connected with a degassing loop, and the degassing loop pump and the degassing device are arranged on the degassing loop. The invention mainly comprises a multi-component gas distribution system and an oil sample oil mixing system, and can efficiently obtain multi-component gas and oil with stable gas content as degassing samples, thereby realizing the calibration and test of the TDLAS gas detection module.
Description
Technical Field
The invention relates to the technical field related to transformer oil liquid detection, in particular to an oil sample oil mixing system based on a multi-component standard gas system and a detection method.
Background
TDLAS gas analysis techniques are essentially absorption spectroscopy techniques that obtain gas concentrations by analyzing the selective absorption of a measured beam of light by a gas. The principle is that when the laser emits light signal to pass through the gas cavity, the photoelectric detector is used to receive the light power of the laser, when the driving current of the laser is changed, the output light power is changed, the wavelength of the light output is changed, so that the change relation between the output light power and the wavelength of the light output is deduced, if no gas absorption line appears in the range of wavelength sweep, the light power received by the photoelectric detector and the light power output by the laser should be the same. However, when the absorption line is found in the wavelength range, there is a depression at the time of optical power test. The type and intensity of the gas can be determined by the wavelength and depth of the recess, which is the basic principle of gas detection.
The TDLAS gas detection module can be used for detecting gas in transformer oil, and in order to perfect research and development, calibration and field practical use of the TDLAS gas detection module and ensure accuracy and reliability of the TDLAS gas detection module, oil with stable multicomponent gas content needs to be obtained as a degassing sample, so that a gas distribution system, an oil mixing system and a corresponding detection method capable of ensuring high-accuracy and large-range test of the TDLAS gas detection module are required to be developed. The traditional oil mixing system mainly adopts an oscillation gas mixing principle or an oil tank oil mixing mode, has the advantages of longer full mixing time, lower mixing efficiency and uncontrollable concentration, and cannot ensure the linearity and accuracy test of the TDLAS gas detection module in a wider concentration range.
Disclosure of Invention
The invention aims to provide an oil sample oil mixing system and a detection method based on a multi-component gas marking system.
The invention aims to achieve the aim, and the aim is achieved by the following technical scheme:
according to one aspect of the invention, an oil sample oil mixing system based on a multi-component gas marking system is provided, and the oil sample oil mixing system comprises a gas distribution system and an oil mixing system;
the gas distribution system comprises a plurality of gas storage tanks for storing single-component gas with fixed concentration, and the plurality of gas storage tanks are respectively connected to an inlet of a static mixer through a single-pole pressure reducing valve, a mass flowmeter and a gate valve which are sequentially arranged on a pipeline, and the inlet of the static mixer is communicated with a standard gas tank;
the oil mixing system comprises an oil supplementing pump, an oil marking tank, a gas-liquid mixing pump, a venturi jet device and a degassing loop pump, wherein the oil supplementing pump is connected with the gas-liquid mixing pump inlet through a pipeline, the gas marking tank is connected with the gas-liquid mixing pump inlet and the venturi jet device air inlet through a pipeline, the gas-liquid mixing pump outlet is connected with the oil marking tank inlet through a pipeline, the oil marking tank outlet is connected with the venturi jet device oil inlet through a pipeline, the venturi jet device outlet is connected with the gas-liquid mixing pump inlet through a pipeline, a cooler is arranged on the pipeline, the oil marking tank is further connected with a degassing loop, and the degassing loop pump and the degassing device are arranged on the degassing loop, and the degassing device is connected with the TDLAS gas detection module.
Further, a first switch valve is arranged on a connecting pipeline of the standard gas tank and the gas-liquid mixing pump, a second switch valve is arranged on a connecting pipeline of the standard gas tank and the air inlet of the venturi jet device, a third switch valve is arranged on a connecting pipeline of the outlet of the venturi jet device and the gas-liquid mixing pump, and a first vacuum pump is arranged on a pipeline between the second switch valve and the venturi jet device.
Further, a one-way valve and a first exhaust valve are arranged on a pipeline connected with the gas-liquid mixing pump at the outlet of the Venturi ejector, and a second exhaust valve and a fourth switch valve are arranged on a pipeline connected with the Venturi ejector.
Further, a second vacuum pump and a flowmeter are also arranged on the degassing loop.
Further, the outlet of the oil marking oil tank, the oil inlet of the Venturi ejector and the degassing loop are communicated through a first two-position three-way electromagnetic valve;
the outlet of the gas-liquid mixing pump, the degassing loop and the inlet of the oil marking oil tank are communicated through a second two-position three-way electromagnetic valve.
Further, the gas distribution system further comprises a first reversing valve and a second reversing valve, the outlet of the static pressure mixer is connected with the inlet of the first reversing valve, the first reversing valve is provided with two outlets, the two outlets are respectively connected with the inlet of the second reversing valve and the gas marking tank, the gas marking tank is connected with a gas chromatograph through a gate valve, the second reversing valve is provided with two outlets, and the two outlets are respectively connected with the TDLAS gas detection module and the atmosphere.
Further, the standard gas tank is connected with a third vacuum pump.
Further, the N2 gas storage tanks for storing the single-component gas comprise an N2 gas storage tank for providing background gas and a plurality of target gas storage tanks, a first pressure gauge is arranged on a pipeline connected with the N2 gas storage tank and the static mixer, and the first pressure gauge is arranged behind a gate valve on a corresponding pipeline.
Further, the gas mixer further comprises a gas combiner, and the plurality of target gas storage tanks are connected to the gas combiner first and then connected with the static mixer.
Further, a second pressure gauge is arranged on a connecting pipeline of the gas combiner and the static mixer, and a third pressure gauge is arranged on the gas tank.
According to another aspect of the present invention, there is provided a method for detecting a standard gas system and an oil sample mixing system, for calibration and calibration of a TDLAS gas detection module, the method comprising a standard gas detection method and an oil sample detection method, wherein the standard gas detection method comprises the steps of:
s11, enabling a gate valve corresponding to the background gas N2 to be in a normally open state, enabling the first reversing valve to be communicated with the second reversing valve, enabling the second reversing valve to be communicated with the atmosphere, opening a gate valve of a target gas required, and switching the second reversing valve to be communicated with the TDLAS gas detection module after the target gas is refluxed and mixed;
s12, after the mixed multi-component gas enters the TDLAS gas detection module, the detection result tends to be stable, at the moment, the second reversing valve is switched to be communicated with the standard gas tank, the gas is led into the standard gas tank which is vacuumized in advance, the third pressure gauge reaches 0.3MPa, the mixing of the gas can be stopped, the first reversing valve and the second reversing valve are restored to the initial state, the mixed gas filled in the standard gas tank is injected into the gas chromatograph for detection, and the detection data and the TDLAS gas detection module data are compared and analyzed;
the oil sample detection method comprises the following steps:
s21, enabling the first two-position three-way valve to be in a state that the gas-liquid mixing pump is communicated with the standard oil tank, enabling the second two-position three-way valve to be in a state that the degassing loop is communicated with the standard oil tank, enabling the oil supplementing pump to operate at a low speed, enabling the oil supplementing pump to be connected with the one-way valve, enabling the oil supplementing pump to be connected with the gas-liquid mixing pump to be connected with the first switching valve, enabling the gas-liquid mixing pump to be connected with the standard oil tank to be connected with the fourth switching valve, enabling the gas in the pipeline to be fully filled with blank oil, and stopping operation of the oil supplementing pump and the gas-liquid mixing pump after being discharged from the first exhaust valve and the second exhaust valve;
s22, starting the first vacuum pump, vacuumizing the venturi ejector to the gas-liquid flow channels of the second switch valve, the third switch valve and the fourth switch valve, wherein the vacuum degree is lower than 30mPa, and stopping the first vacuum pump;
s23, opening a fourth switch valve to enable the oil supplementing pump and the gas-liquid mixing pump to run slowly again, enabling oil to enter a venturi ejector to flow channels of the second switch valve, the third switch valve and the fourth switch valve and be full, then opening the third switch valve, enabling the oil to pass through a cooler, a one-way valve and a first exhaust valve, discharging gas in a pipeline from the first exhaust valve, returning to an oil way at the oil supplementing pump, running for a period of time, and closing the first exhaust valve after all the gas in the pipeline is discharged;
s24, opening the first switch valve and the second switch valve, simultaneously opening the cooler, and enabling the gas-liquid mixing pump to run at a standard speed, so that the standard gas and the blank oil liquid are mixed;
s25, after a period of operation, stopping the operation of the gas-liquid mixing pump, starting the second vacuum pump, vacuumizing the degassing oil path, and stopping the operation of the second vacuum pump when the vacuum degree is lower than 30mPa, wherein the first two-position three-way valve and the second two-position three-way valve are switched, so that the oil in the oil marking oil tank is in vacuum due to the fact that the pipeline is in the oil marking oil tank, and the oil flows into the degassing oil path and is full;
s26, starting a degassing loop pump, circulating oil in a degassing oil way, overflowing a gas degasser in the oil under the action of pressure, continuously remaining the oil in the degassing oil way, after a period of circulation, starting a switch valve at the rear of the degasser, and detecting that gas enters a TDLAS gas detection module
Compared with the prior art, the invention has the beneficial effects that:
1. the invention mainly comprises a gas distribution system of standard gas and an oil mixing system of a standard oil sample, wherein the required standard gas is obtained through the gas distribution system, the standard oil sample is obtained by mixing the obtained standard gas with a blank oil sample, a Venturi ejector commonly used for mixing gas and liquid is combined with a gas-liquid mixing pump to form a closed-circuit liquid flow circulation system, and devices such as oil supplementing, gas supplementing, cooling, oil taking and degassing are matched in the closed-circuit system to form a liquid flow system capable of dynamically circulating and continuously achieving oil-gas balance, after repeated circulation mixing, the mixed oil liquid is degassed through a degassing module to obtain a standard degassing sample, and the TDLAS gas detection module is used for detection, so that the calibration and the calibration of a TDLAS gas detection module can be realized.
2. In the gas distribution system, a plurality of single-component gases with fixed concentrations are input, wherein N2 is background gas, other gases are target gases to be detected by the TDLAS gas detection module, the required gases can be added according to the test requirement, when one or more gases need to be detected, the corresponding gate valve is opened, the gases can be detected and analyzed through the TDLAS gas detection module and the gas chromatograph through switching of the first reversing valve and the second reversing valve, the development and the calibration of the TDLAS gas detection module are realized through data comparison of the TDLAS gas detection module and the gas chromatograph, and the precision and the reliability of the TDLAS gas detection module are ensured.
3. According to the detection method, the calibration, the measurement and the like of the TDLAS gas detection module can be realized through the data comparison of the TDLAS gas detection module and the gas chromatograph in the gas distribution system, and the calibration, the calibration and the like of the TDLAS gas detection module can be realized through the detection in the oil mixing system.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic diagram of the gas distribution system of the present invention.
The reference numbers shown in the drawings:
1. a make-up pump; 2. a gas-liquid mixing pump; 3. a gas marking tank; 4. a standard oil tank; 5. a venturi jet; 6. a degasser; 7. a degassing circuit pump; 8. a first vacuum pump; 9. a cooler; 10. a one-way valve; 11. a first exhaust valve; 12. a first two-position three-way valve; 13. a second two-position three-way valve; 14. a flow meter; 15. a second exhaust valve; 16. a first switching valve; 17. a second switching valve; 18. a third switching valve; 19. a fourth switching valve; 20. a second vacuum pump; 21. a monopolar pressure relief valve; 22. a mass flowmeter; 23. a gate valve; 24. a first pressure gauge; 25. a static mixer; 26. a gas combiner; 27. a second pressure gauge; 28. a first reversing valve; 29. a second gate valve; 210. a third pressure gauge; 211. a second reversing valve; 212. a TDLAS gas detection module; 213. a third vacuum pump; 214. a gas chromatograph.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it will be understood that various changes or modifications may be made by those skilled in the art after reading the teachings of the invention, and such equivalents are intended to fall within the scope of the invention as defined herein.
As shown in fig. 1 and 2, the invention provides an oil sample oil mixing system based on a multi-component standard gas system. The system mainly comprises two parts: standard gas distribution system and oil mixing system. The gas distribution system is mainly used for obtaining required standard gas, the standard gas is fully mixed with blank oil samples in the oil mixing system, the required standard oil samples are finally obtained, the standard oil samples are circularly subjected to degassing treatment in the degassing loop, and the required test samples are finally obtained.
Example 1:
the embodiment provides a gas distribution system of standard gas, which is mainly used for obtaining multi-component standard gas, wherein the standard gas is stored in a standard gas tank and is used for being mixed with blank oil liquid to obtain a standard oil sample. The gas distribution system provided by the embodiment can also provide corresponding data support for research, development, calibration and the like of the TDLAS gas detection module, so that the accuracy of the TDLAS gas detection module is ensured.
Specifically, the air distribution system provided in this embodiment adopts the core components such as the high-precision mass flowmeter 22 and the static mixer 25, so that the multicomponent standard gas can be mixed and proportioned efficiently, uniformly and accurately, and the mass flowmeter 22 is used for dynamic air distribution, so that the influence of pressure and temperature changes of the medium is minimized.
As shown in fig. 2, the system inputs a plurality of single-component gases with fixed concentrations, in the illustration, N2 is background gas, other gases are target gases to be detected by the TDLAS gas detection module, and the target gases are 6 gases including CO, CO2, CH4, C2H6, C2H4 and C2H2, and other types of gases can be additionally added according to the test requirement.
The left side of the system in fig. 2 is a gas storage tank for each single-component gas, the gas in the gas storage tank is decompressed by a single-pole decompression valve 21 and then enters a mass flowmeter 22, and the output flow rate of each gas is controlled by the mass flowmeter 22. The N2 gas tank is connected to the static mixer 25 through the gate valve 23, and the target gas tank enters the gas combiner 26 through the gate valve 23 and flows into the static mixer 25 through the gas combiner 26. The gate valve 23 of the corresponding pipeline of the background gas N2 is in a normally open state, the gate valves 23 of other single-component gases are in a normally closed state, and when one or more gases need to be detected, the corresponding gate valves 23 are opened. The initially-converged gas is not sufficiently mixed, so that the gas outputted from the gas converging device 26 is converged with the background gas N2 again and enters the static mixer 25. The principle of the static mixer 25 is to break up turbulence by means of a spoiler to allow the gases to mix well. The outlet of the static pressure mixer 25 is connected to the inlet of the first reversing valve 28, the first reversing valve 28 is provided with two outlets, the two outlets are respectively connected with the inlet of the second reversing valve 211 and the standard gas tank 3, the outlet of the standard gas tank 3 is connected with the gas chromatograph 214 through the second gate valve 29, the standard gas tank 3 is simultaneously connected with the third vacuum pump 213, the second reversing valve 211 is also provided with two outlets, and the two outlets are respectively connected with the TDLAS gas detection module 12 and the atmosphere.
In the present embodiment, preferably, in order to facilitate detection of the pressure of each pipeline, a first pressure gauge 24 is provided on the background gas N2 pipeline, a second pressure gauge 27 is provided on the connecting pipeline of the gas combiner 26 and the static mixer 25, and a third pressure gauge 210 is provided at the standard gas tank 3.
Since the gate valve 23 of the background gas N2 is in a normally open state, in order to ensure the system pipeline purging effect and the system safety, the first reversing valve 28 and the second reversing valve 211 are set in the state shown in fig. 2, when the gate valve of the target gas is opened, after converging and mixing, the second reversing valve 211 is switched, the multicomponent gas enters the TDLAS gas detection module 212 to be detected, after the multicomponent gas is mixed for a period of time and blown through the TDLAS gas detection module 212, the detection result tends to be stable, the first reversing valve 211 is switched, the gas is led into the target gas tank 3 which is vacuumized in advance, and the mixing of the gas can be stopped when the third pressure gauge 210 reaches 0.3MPa, and both the first reversing valve 28 and the second reversing valve 211 are restored to the initial states. The mixed gas filled in the standard gas tank 3 is injected into the gas chromatograph 214 for detection, and the detection data of the gas chromatograph 214 corresponds to the data of the TDLAS gas detection module 212 one by one, so as to be used for development and calibration of the TDLAS gas detection module 212.
In the actual use process, in order to reduce the flow ratio of the background gas N2 to each single-component gas during the gas mixing, the control of the flow by the mass flowmeter 22 is improved, which is more beneficial to improving the gas mixing precision, so that each single-component gas in the gas storage tank should be correspondingly diluted. The output pressure of each air storage tank needs to be limited, and the pressure cannot be too high or too low. Firstly, the pressure setting is not more than 0.2MPa (2 Bar), although the pressure-resistant grade of the mass flowmeter 2 can reach 3MPa and the maximum working pressure is 0.45MPa, the pressure of the air chamber of the TDLAS gas detection module 212 is basically equal to the atmospheric pressure, and the pressure drop flowing out of the mass flowmeter 22 is overlarge, so that turbulence is formed in the valve to directly impact the air chamber of the detection module, and oscillation is formed, the turbulence is aggravated, the air flow is unstable, and the corresponding detection value is unstable. Secondly, the pressure must not be lower than 1Bar, because the working pressure range of the mass flowmeter 22 needs to be larger than 0.5Bar (the lowest pressure of the small range is >0.5Bar, the lowest pressure of the large range is >1 Bar), and too low pressure can weaken the valve core control of the mass flowmeter 2, the control accuracy of the flow value is poor, and the actual gas concentration fluctuation range is enlarged, so that the measurement is unstable. In summary, it is preferable to control the output pressure of the gas tank to be 1-2 bar.
Example 2:
the present embodiment provides an oil-like oil mixing system based on the standard gas tank 3 of embodiment 1, and the standard gas used in the oil mixing system is the standard gas stored in the standard gas tank 3 of embodiment 1.
As shown in fig. 1, the oil mixing system comprises an oil supplementing pump 1, a gas standard tank 3, an oil standard tank 4, a gas-liquid mixing pump 2, a venturi jet device 5 and a degassing loop pump 7, wherein the oil supplementing pump 1 is used for pumping a blank oil sample from an oil tank and sending the blank oil sample into an inlet of the gas-liquid mixing pump 2, the gas standard tank 3 is used for providing standard gas, is connected with the inlet of the gas-liquid mixing pump 2 through a pipeline and is used for sending the standard gas into the gas-liquid mixing pump 2, primary mixing is carried out in the gas-liquid mixing pump 2, the gas standard gas tank 3 is simultaneously connected with an air inlet of the venturi jet device 5, an outlet of the gas-liquid mixing pump 2 is connected with an inlet of the oil standard tank 4 through a pipeline and is connected with an oil inlet of the venturi jet device 4, an outlet of the oil standard tank 4 is connected with an oil inlet of the venturi jet device 5 through a pipeline, a venturi effect is utilized in the venturi jet device 5, low pressure is generated near fluid flowing at high speed, so as to generate adsorption effect, the standard gas and the mixed oil liquid is mixed again, the mixed oil liquid is cooled again through a cooler 9, the temperature after the standard gas and the mixed oil liquid passes through the pump and the venturi jet device 5, the temperature is increased, the solubility of the standard oil is improved, the mixed oil is mixed after the mixed oil liquid is mixed again and the standard oil liquid is mixed again and the mixed in the gas circulation mode after the mixed oil liquid and the standard oil liquid is mixed. The oil tank 4 is also connected with a degassing loop, a degassing loop pump 7 and a degassing device 6 are arranged on the degassing loop, the mixed oil is degassed through the degassing device 6 in the circulation process, and the degassing is detected by a TDLAS gas detection module or detected by gas chromatography.
Preferably, in this embodiment, a first switch valve 16 is disposed on a connecting pipeline between the target gas tank 3 and the gas-liquid mixing pump 2 for controlling on/off of the gas, a second switch valve 17 is disposed on a connecting pipeline between the target gas tank 3 and the gas inlet of the venturi jet 5 for controlling on/off of the gas, a third switch valve 18 is disposed on a connecting pipeline between the outlet of the venturi jet 5 and the gas-liquid mixing pump 2 for controlling on/off of the mixed oil, a first vacuum pump 8 is disposed on a pipeline between the second switch valve 17 and the venturi jet 5, and a one-way valve 10 and a first exhaust valve 11 are disposed on a pipeline connected between the outlet of the venturi jet 5 and the gas-liquid mixing pump 2 for preventing backflow of the oil, and exhaust is achieved at the same time.
Preferably, in this embodiment, the pipeline connecting the standard oil tank 4 and the venturi jet device 5 is provided with a second exhaust valve 15 and a fourth switch valve 19 for controlling the on-off and exhaust of the pipeline, the degassing circuit is also provided with a second vacuum pump 20 for vacuumizing the pipeline, and the degassing circuit is also provided with a flowmeter 14 for detecting flow.
Preferably, in the present embodiment, the outlet of the oil marking tank 4 is connected to the first two-position three-way electromagnetic valve 12, and two outlets of the first two-position three-way electromagnetic valve 12 are respectively connected with the oil inlet of the venturi jet device 5 and the degassing loop, and the outlet of the oil marking tank 4 is controlled to be communicated with the venturi jet device 5 or the degassing loop through the first two-position three-way electromagnetic valve 12; similarly, the outlet of the gas-liquid mixing pump 2, the degassing loop and the inlet of the oil marking tank 4 are communicated through a second two-position three-way electromagnetic valve 13, and the inlet of the oil marking tank 4 is controlled to be communicated with the gas-liquid mixing pump 2 or the degassing loop through the second two-position three-way electromagnetic valve 13.
Example 3:
the embodiment provides a detection method, which mainly comprises the steps of detecting gas in a gas distribution system and detecting degassing in an oil mixing system, and can realize experiments such as calibration, linear calibration, research and development of a TDLAS gas detection module through data measured by the TDLAS gas detection module.
In this embodiment, the method for detecting gas in a gas distribution system mainly includes the following steps:
s11, since the gate valve 23 of the background gas N2 is in a normally open state, in order to ensure the purging effect of a system pipeline and the system safety, the first reversing valve 28 and the second reversing valve 211 are set in the state shown in FIG. 2, and after the gate valve of the target gas is opened, the second reversing valve 211 is switched through confluence and mixing, and the multi-component gas enters the TDLAS gas detection module 212 for detection;
s12, after the multi-component gas is mixed for a period of time and blown through the TDLAS gas detection module 212, the detection result tends to be stable, the first reversing valve 211 is switched, the gas is led into the standard gas tank 3 which is vacuumized in advance, the third pressure gauge 210 reaches 0.3MPa, and then the gas mixing can be stopped, and the first reversing valve 28 and the second reversing valve 211 are restored to the initial states. The mixed gas filled in the standard gas tank 3 is injected into the gas chromatograph 214 for detection, and the detection data of the gas chromatograph 214 corresponds to the data of the TDLAS gas detection module 212 one by one, so as to be used for development and calibration of the TDLAS gas detection module 212.
In this embodiment, the degassing detection method in the oil mixing system is as follows:
in the initial state, as shown in fig. 1, all the on-off valves are in a normally closed state, the first two-position three-way valve 12 and the second two-position three-way valve 13 are also in the states shown in the figure, and the method operates according to the following steps:
s21, enabling the oil supplementing pump 1 and the gas-liquid mixing pump 2 to operate at a low speed, enabling the oil supplementing pump 1 to the one-way valve 10, the oil supplementing pump 1 to the gas-liquid mixing pump 2 to the first switch valve 16, and the gas-liquid mixing pump 2 to the standard oil tank 4 to the fourth switch valve 19 to be full of blank oil, and stopping the operation of the oil supplementing pump 1 and the gas-liquid mixing pump 2 after the gas in the pipeline is discharged from the first exhaust valve 11 and the second exhaust valve 15;
s22, starting the first vacuum pump 8, vacuumizing the gas-liquid flow channels from the venturi ejector 5 to the second switch valve 17, the third switch valve 18 and the fourth switch valve 19, wherein the vacuum degree is lower than 30mPa, and stopping the operation of the first vacuum pump 8;
s23, opening a fourth switch valve 19 to enable the oil supplementing pump 1 and the gas-liquid mixing pump 2 to run at a low speed again, enabling oil to enter a flow passage from the Venturi ejector 5 to the second switch valve 17, the third switch valve 18 and the fourth switch valve 19 and be full, then opening the third switch valve 18, enabling the oil to pass through the cooler 9, the one-way valve 10 and the first exhaust valve 11, discharging gas in a pipeline from the first exhaust valve 11, returning to an oil way at the oil supplementing pump 1, running for a period of time, discharging all the gas in the pipeline, and closing the first exhaust valve 11;
s24, opening the first switch valve 16 and the second switch valve 17, simultaneously opening the cooler 9, enabling the gas-liquid mixing pump 2 to run at a standard speed, and starting mixing of standard gas and blank oil;
s25, after a period of operation, stopping the operation of the gas-liquid mixing pump 2, starting the second vacuum pump 20, vacuumizing a degassing oil path, and stopping the operation of the second vacuum pump 20 when the vacuum degree is lower than 30mPa, wherein the positions of the first two-position three-way valve 12 and the second two-position three-way valve 13 are switched, so that the vacuum is formed in a pipeline in the oil marking oil tank 4, and oil flows into the degassing oil path and is filled;
s26, the degassing loop pump 7 is started, oil circulates in a degassing oil way, under the action of pressure, the gas in oil degasifier 6 overflows, the oil still continuously remains in the degassing oil way, after a period of circulation, a switching valve at the rear of the degasifier 6 is started, gas enters a TDLAS gas detection module for detection, and the TDLAS gas detection module can realize linearity and accuracy test in a relatively wide range due to controllable concentration, so that a data basis is provided for the practical detection application of the TDLAS gas detection module to the gas in transformer oil.
Claims (10)
1. An oil sample oil mixing system based on a multi-component gas marking system is characterized by comprising a gas distribution system and an oil mixing system;
the gas distribution system comprises a plurality of gas storage tanks for storing single-component gas with fixed concentration, and the plurality of gas storage tanks are respectively connected to an inlet of a static mixer through a single-pole pressure reducing valve, a mass flowmeter and a gate valve which are sequentially arranged on a pipeline, and the inlet of the static mixer is communicated with a standard gas tank;
the oil mixing system comprises an oil supplementing pump, an oil marking tank, a gas-liquid mixing pump, a venturi jet device and a degassing loop pump, wherein the oil supplementing pump is connected with the gas-liquid mixing pump inlet through a pipeline, the gas marking tank is connected with the gas-liquid mixing pump inlet and the venturi jet device air inlet through a pipeline, the gas-liquid mixing pump outlet is connected with the oil marking tank inlet through a pipeline, the oil marking tank outlet is connected with the venturi jet device oil inlet through a pipeline, the venturi jet device outlet is connected with the gas-liquid mixing pump inlet through a pipeline, a cooler is arranged on the pipeline of the venturi jet device outlet, the oil marking tank is further connected with a degassing loop, the degassing loop pump and a degassing device are arranged on the degassing loop, and the degassing device is connected with a TDLAS gas detection module.
2. The oil sample oil mixing system based on the multicomponent gas marking system according to claim 1, wherein a first switch valve is arranged on a connecting pipeline of the gas marking gas tank and the gas-liquid mixing pump, a second switch valve is arranged on a connecting pipeline of the gas marking gas tank and the venturi jet device air inlet, a third switch valve is arranged on a connecting pipeline of the venturi jet device outlet and the gas-liquid mixing pump, and a first vacuum pump is arranged on a pipeline between the second switch valve and the venturi jet device.
3. The oil sample oil mixing system based on the multi-component gas marking system according to claim 1, wherein a one-way valve and a first exhaust valve are arranged on a pipeline connected with the venturi jet outlet and the gas-liquid mixing pump, and a second exhaust valve and a fourth switch valve are arranged on a pipeline connected with the venturi jet of the oil marking oil tank.
4. The oil-like oil mixing system based on a multi-component gas marking system according to claim 1, wherein a second vacuum pump and a flowmeter are further arranged on the degassing circuit.
5. The oil sample oil mixing system based on the multi-component gas marking system according to claim 1, wherein the outlet of the oil marking tank, the inlet of the venturi jet device and the degassing loop are communicated through a first two-position three-way electromagnetic valve;
the outlet of the gas-liquid mixing pump, the degassing loop and the inlet of the oil marking oil tank are communicated through a second two-position three-way electromagnetic valve.
6. The oil-like mixing system based on a multi-component gas marking system according to any one of claims 1-5, wherein the gas distribution system further comprises a first reversing valve and a second reversing valve, the static mixer outlet is connected to the first reversing valve inlet, the first reversing valve has two outlets, the two outlets are respectively connected to the second reversing valve inlet and the gas marking gas tank, the gas marking gas tank is connected to a gas chromatograph through a gate valve, the second reversing valve has two outlets, and the two outlets are respectively connected to the TDLAS gas detection module and the atmosphere.
7. The oil-sample oil mixing system based on the multi-component gas marking system according to claim 6, wherein the plurality of gas tanks for storing single-component gas comprise an N2 gas tank for providing background gas and a plurality of target gas tanks, a first pressure gauge is arranged on a pipeline connected with the static mixer, and the first pressure gauge is arranged behind a gate valve on a corresponding pipeline.
8. The multi-component gas standard system-based oil-sample oil mixing system according to claim 7, further comprising a gas combiner, wherein the plurality of target gas reservoirs are commonly connected to the gas combiner before being connected to the static mixer.
9. The oil-sample oil mixing system based on the multi-component gas marking system according to claim 8, wherein a second pressure gauge is arranged on a connecting pipeline of the gas combiner and the static mixer, a third pressure gauge is arranged on the gas marking gas tank, and the gas marking gas tank is connected with a third vacuum pump.
10. A method of detecting an oil-like oil mixing system based on a multi-component gas marking system according to any one of claims 1-9 for calibration and calibration of TDLAS gas detection modules, characterized in that the method of detecting comprises a standard gas detection method and an oil-like detection method, wherein the standard gas detection method comprises the steps of:
s11, enabling a gate valve corresponding to the background gas N2 to be in a normally open state, enabling the first reversing valve to be communicated with the second reversing valve, enabling the second reversing valve to be communicated with the atmosphere, opening a gate valve of a target gas required, and switching the second reversing valve to be communicated with the TDLAS gas detection module after the target gas is refluxed and mixed;
s12, after the mixed multi-component gas enters the TDLAS gas detection module, the detection result tends to be stable, at the moment, the second reversing valve is switched to be communicated with the standard gas tank, the gas is led into the standard gas tank which is vacuumized in advance, the third pressure gauge reaches 0.3MPa, the mixing of the gas can be stopped, the first reversing valve and the second reversing valve are restored to the initial state, the mixed gas filled in the standard gas tank is injected into the gas chromatograph for detection, and the detection data and the TDLAS gas detection module data are compared and analyzed;
the oil sample detection method comprises the following steps:
s21, enabling the first two-position three-way valve to be in a state that the gas-liquid mixing pump is communicated with the standard oil tank, enabling the second two-position three-way valve to be in a state that the degassing loop is communicated with the standard oil tank, enabling the oil supplementing pump to operate at a low speed, enabling the oil supplementing pump to be connected with the one-way valve, enabling the oil supplementing pump to be connected with the gas-liquid mixing pump to be connected with the first switching valve, enabling the gas-liquid mixing pump to be connected with the standard oil tank to be connected with the fourth switching valve, enabling the gas in the pipeline to be fully filled with blank oil, and stopping operation of the oil supplementing pump and the gas-liquid mixing pump after being discharged from the first exhaust valve and the second exhaust valve;
s22, starting the first vacuum pump, vacuumizing the venturi ejector to the gas-liquid flow channels of the second switch valve, the third switch valve and the fourth switch valve, wherein the vacuum degree is lower than 30mPa, and stopping the first vacuum pump;
s23, opening a fourth switch valve to enable the oil supplementing pump and the gas-liquid mixing pump to run slowly again, enabling oil to enter a venturi ejector to flow channels of the second switch valve, the third switch valve and the fourth switch valve and be full, then opening the third switch valve, enabling the oil to pass through a cooler, a one-way valve and a first exhaust valve, discharging gas in a pipeline from the first exhaust valve, returning to an oil way at the oil supplementing pump, running for a period of time, and closing the first exhaust valve after all the gas in the pipeline is discharged;
s24, opening the first switch valve and the second switch valve, simultaneously opening the cooler, and enabling the gas-liquid mixing pump to run at a standard speed, so that the standard gas and the blank oil liquid are mixed;
s25, after a period of operation, stopping the operation of the gas-liquid mixing pump, starting the second vacuum pump, vacuumizing the degassing oil path, and stopping the operation of the second vacuum pump when the vacuum degree is lower than 30mPa, wherein the first two-position three-way valve and the second two-position three-way valve are switched, so that the oil in the oil marking oil tank is in vacuum due to the fact that the pipeline is in the oil marking oil tank, and the oil flows into the degassing oil path and is full;
s26, starting a degassing loop pump, circulating oil in a degassing oil way, overflowing a gas degassing device in the oil under the action of pressure, continuously remaining the oil in the degassing oil way, and after a period of circulation, starting a switch valve at the rear of the degassing device, wherein the gas enters a TDLAS gas detection module for detection.
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