CN215812406U - Optical detection system for thionyl fluoride gas - Google Patents
Optical detection system for thionyl fluoride gas Download PDFInfo
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- CN215812406U CN215812406U CN202121444499.7U CN202121444499U CN215812406U CN 215812406 U CN215812406 U CN 215812406U CN 202121444499 U CN202121444499 U CN 202121444499U CN 215812406 U CN215812406 U CN 215812406U
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Abstract
An optical detection system for thionyl fluoride gas comprises an optical gas absorption cell, a mixed gas chemical reaction device and laserThe gas outlet of the mixed gas chemical reaction device is connected with the gas inlet of the optical gas absorption pool, the gas outlet of the optical gas absorption pool is connected with the gas inlet of the exhaust device, the laser modulation and demodulation unit is connected with the optical gas absorption pool through an incident optical fiber and an emergent signal cable, and the laser modulation and demodulation unit is connected with the display unit through a communication cable. The utility model can accurately detect SF6Intermediate product SOF in early process of hidden danger or fault of high-voltage equipment2Gas, determining the nature and extent of the fault. The utility model realizes the same function by utilizing devices such as a near-infrared light source, a detector, an optical fiber and the like with low cost and technical degree, so that the product has more cost advantage and is more beneficial to popularization.
Description
Technical Field
The utility model belongs to the technical field of verification and calibration of gas detection instruments, and particularly relates to an optical detection system for thionyl fluoride gas.
Background
SF in sulfur hexafluoride electrical equipment6The content of gas decomposition products indicates the operation condition and fault hidden danger of the equipment, and improves SF6The defect diagnosis capability and the operation reliability of the electrical equipment have important significance. IEC60480 SF6The gas detection and treatment guide and earlier research results show that the thionyl fluoride (SOF)2) The sulfur hexafluoride insulation electric equipment fault analysis method is an important gas characteristic decomposition product generated by decomposition in the fault process of sulfur hexafluoride insulation electric equipment, the sulfuryl decomposition product is generated in the hidden trouble period or early fault period, the fault property and the development degree are represented, the absolute value or the proportional relation of detection data can effectively represent the relation between the equipment fault discharge energy and the overheating index, and the SOF is realized2The method can analyze and diagnose hidden danger and fault conditions of the sulfur hexafluoride insulation electrical equipment more timely and comprehensively, and has important guiding significance for early warning of potential faults and life cycle management of the sulfur hexafluoride insulation electrical equipment.
Current detection of SOF2Is immature in the detection method of (1), SOF2The detection is also a Fourier infrared absorption spectrum method equipped with a liquid nitrogen full-time cooling Mercury Cadmium Telluride (MCT) detector, the method needs to sample from the site and return to a laboratory for detection, the content condition of the decomposition products in the equipment can not be really reflected due to the influence of instability of the decomposition products and environmental factors, meanwhile, the gas path in the sampling process is complex, the instrument is expensive, and the method has limited sensitivity and can not meet the condition for carrying out on-site live detection.
Aiming at the problem, scientific researchers in China adopt titanium dioxide nanotubes, silver-doped graphene and electrochemistry to SO2F2、SOF2The research on the detection technology theory is carried out, but no product is formed. Gas chromatography also has problems of long detection time, susceptibility to environmental influences, periodic calibration, poor portability, and the like.
The optical detection technology can effectively detect the SOF2Gas detection, early investigation to discover SOF2The characteristic absorption peak mainly exists in a middle infrared band, and no obvious characteristic absorption peak exists in a near infrared band. E.g. in the mid-infrared bandThe narrow-band spectrum detection is carried out, the used intermediate infrared quantum cascade laser and the intermediate infrared band detector are expensive at present, the technical maturity of the product is not high, and the application on a large scale at the present stage is not facilitated.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides the optical detection system for the fluorinated thionyl gas, which has the advantages of high sensitivity, no cross interference and high cost performance.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a gaseous optical detection system of thionyl fluoride, including the optical gas absorption cell, the gaseous chemical reaction device of mist, laser modulation demodulation unit, display element and exhaust apparatus, the gas outlet of gaseous chemical reaction device of mist is connected with the air inlet of the gaseous absorption cell of optics, the gas outlet and the exhaust apparatus air inlet of the gaseous absorption cell of optics are connected, laser modulation demodulation unit is through incidenting optic fibre, outgoing signal cable is connected with the gaseous absorption cell of optics, laser modulation demodulation unit passes through the communication cable and is connected with display element.
The inside detection air chamber cavity that is equipped with of optical gas absorption cell, the length direction who detects the air chamber cavity sets up along left right direction, detects air chamber cavity left end portion and is equipped with optical collimator and near infrared photoelectric detector, optical collimator and incident optical fiber connection, near infrared photoelectric detector and exit signal cable connection, it is equipped with the reflection lens to detect air chamber cavity right-hand member portion, it is equipped with respectively to detect air chamber cavity left side and right side and detects the air chamber and export.
The mixed gas chemical reaction device comprises a reaction gas chamber cavity, an air inlet pipeline and a measured gas inlet pipeline, wherein the length direction of the reaction gas chamber cavity is arranged along the left-right direction, the left end and the right end of the reaction gas chamber cavity are respectively provided with a reaction gas chamber inlet and a reaction gas chamber outlet, the air inlet pipeline and the gas outlet of the measured gas inlet pipeline are both connected with the reaction gas chamber inlet, the air inlet pipeline is provided with an air electronic flowmeter, the measured gas inlet pipeline is sequentially provided with a needle valve and a sampling electronic flowmeter along the air flow direction, the reaction gas chamber outlet is connected with a detection gas chamber inlet through a reaction gas pipe, the reaction gas pipe is provided with a valve, and the air electronic flowmeter and the sampling electronic flowmeter are both connected with a laser modulation and demodulation unit through a control circuit.
The exhaust device comprises an exhaust pipe and an exhaust pump, wherein an inlet of the exhaust pipe is connected with an outlet of the detection air chamber, and the exhaust pump is installed on the exhaust pipe.
The laser modulation and demodulation unit is provided with a near infrared laser capable of emitting light absorbed by HF gas, a laser temperature control circuit, a laser signal modulation circuit and a photoelectric signal demodulation circuit, and the central wavelength of the laser includes but is not limited to 1278nm and 1310nm which can be absorbed by the HF gas.
By adopting the technical scheme, the detection method of the optical detection system for the fluorinated thionyl gas comprises the following steps:
(1) the laser modulation and demodulation unit controls the air electronic flowmeter and the sampling electronic flowmeter, so that the flow ratio of air and the measured gas entering the cavity of the reaction gas chamber is 1: 1, after the gas to be detected is uniformly mixed with air in the reaction gas chamber cavity, the gas to be detected is catalyzed by a catalyst in the reaction gas chamber cavity, and the SOF in the gas to be detected2The gas and the moisture contained in the air are fully chemically reacted to generate HF gas and SO2Gas, the reaction formula is: SOF2 + H2O =SO2+2HF。
(2) Opening a valve on the reaction gas pipe, starting an exhaust pump, and reacting HF gas and SO generated in the reaction gas chamber cavity2Introducing gas into the cavity of the detection gas chamber;
(3) the laser modulation and demodulation unit controls the laser to emit modulated laser with variable wavelength, the wavelength of the laser changes along the rule of HF gas absorption peak, the laser is guided into the cavity of the detection air chamber through the incident optical fiber, the laser is collimated into parallel light by the optical fiber collimator and then emitted to the reflection lens, the laser is reflected by the reflection lens and then emitted to the near infrared photoelectric detector, the near infrared photoelectric detector converts the absorbed optical signal into an electric signal, the signal is transmitted to the laser modulation and demodulation unit through an emergent signal cable, and the data is displayed by the display unit; the laser modulation-demodulation unit detects the absorptionThe concentration of HF gas in the gas outlet chamber is calculated by the received photoelectric absorption signal through an inversion algorithm, and the SOF in the sample gas is back-calculated through the air quantity recorded by the air electronic flowmeter and the measured gas quantity recorded by the sampling electronic flowmeter2The content of gas;
(4) and under the action of the exhaust pump, the gas in the detection air chamber cavity is extracted and exhausted through an exhaust port of the exhaust pipe.
The utility model adopts an optical detection method and uses SOF2The hot spot of gas with active chemical property and easy hydrolysis converts the reaction of the gas to be detected and water into HF and SO2（SOF2 + H2O =SO2+2 HF), detecting HF gas in near infrared band by TDLAS principle, and using the detection result to back-derive SOF2The gas concentration.
The technique has the following advantages: high sensitivity, no cross interference and high cost performance.
The reason why the sensitivity is high: tunable laser absorption spectroscopy (TDLAS) is an emerging discipline that has emerged from laser technology and developed based on traditional spectroscopy. The laser has the following characteristics: the spectrum line width is extremely narrow, the coherence is excellent, the spectrum power density is extremely high, the wavelength can be tuned, the frequency and the amplitude can be modulated, and the like. These properties of lasers have revolutionized spectroscopy. The resolution and sensitivity of laser absorption spectroscopy techniques can be much higher than conventional spectroscopic methods compared to conventional absorption spectroscopy. HF gas has strong absorption capacity in the near infrared region, and high sensitivity detection at ppb level can be realized by using the high sensitivity characteristic of TDLAS technology, so that SOF (soluble organic solvent) can be realized2High sensitivity detection.
The reason of no cross interference is as follows: the utility model adopts TDLAS technology to process SOF2The lower-level reaction product Hydrogen Fluoride (HF) is detected, the TDLAS technology adopts single-line absorption spectrum for detection, the absorption spectrum is selected to avoid an absorption spectrum line which possibly has cross interference when the absorption spectrum is detected, and an absorption spectrum line which does not interfere with other gases is selected for measurement, so that the cross interference of other gases can be avoided in principle.
The reason of high cost performance is as follows: the middle infrared band laser and the detector are immature in the prior art, expensive in price and mainly applied to the field of scientific research at present; and optical devices such as near-infrared band lasers, detectors, optical fibers and the like are overlapped with the wavelength range of the optical communication industry, so that the product maturity is high, the cost is well controlled, and the cost performance is high at present. The detection method of the utility model can use a near infrared light source to the SOF2The gas is detected, and the near infrared device with relatively low cost is utilized to complete the work which can only be carried out in the middle infrared region originally, so that the gas detection device has extremely high cost performance.
In conclusion, the utility model can accurately detect SF6Intermediate product SOF in early process of hidden danger or fault of high-voltage equipment2Gas, determining fault property and development degree, and filling domestic and foreign SOF2Detection technique of blank, sound and perfect SF6And the evaluation means of the running state of the electrical equipment further effectively ensures the safe and stable running of the equipment.
SOF2The infrared laser spectrum detection of gas originally needs to use devices such as a laser, a detector, a lens and the like in a middle infrared band, and the technology is immature and the price is high. The utility model realizes the same function by utilizing devices such as a near-infrared light source, a detector, an optical fiber and the like with low cost and technical degree, so that the product has more cost advantage and is more beneficial to popularization.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, the optical detection system for thionyl fluoride gas of the present invention includes an optical gas absorption cell, a mixed gas chemical reaction device, a laser modulation and demodulation unit 1, a display unit 2 and an exhaust device, wherein an air outlet of the mixed gas chemical reaction device is connected to an air inlet of the optical gas absorption cell, an air outlet of the optical gas absorption cell is connected to an air inlet of the exhaust device, the laser modulation and demodulation unit 1 is connected to the optical gas absorption cell through an incident optical fiber 3 and an outgoing signal cable 4, and the laser modulation and demodulation unit 1 are connected to the display unit 2 through a communication cable 5.
Inside being equipped with of optical gas absorption cell and detecting air chamber cavity 6, the length direction who detects air chamber cavity 6 sets up along left right direction, it is equipped with fiber collimator 7 and near infrared photoelectric detector 8 to detect 6 left end portions of air chamber cavity, fiber collimator 7 is connected with incident optical fiber 3, near infrared photoelectric detector 8 is connected with emitting signal cable 4, it is equipped with reflection lens 9 to detect 6 right-hand member portions of air chamber cavity, it is equipped with respectively to detect 6 left sides of air chamber cavity and right side and detects air chamber entry 10 and detect air chamber export 11.
The mixed gas chemical reaction device comprises a reaction gas chamber cavity 12, an air inlet pipeline 13 and a measured gas inlet pipeline 14, wherein the length direction of the reaction gas chamber cavity 12 is arranged along the left and right directions, the left end and the right end of the reaction gas chamber cavity 12 are respectively provided with a reaction gas chamber inlet 15 and a reaction gas chamber outlet 16, gas outlets of the air inlet pipeline 13 and the measured gas inlet pipeline 14 are respectively connected with the reaction gas chamber inlet 15, the air inlet pipeline 13 is provided with an air electronic flowmeter 17, the measured gas inlet pipeline 14 is sequentially provided with a needle valve 18 and a sampling electronic flowmeter 19 along the gas flow direction, the reaction gas chamber outlet 16 is connected with a detection gas chamber inlet 10 through a reaction gas pipe 21, the reaction gas pipe 21 is provided with a valve 20, and the air electronic flowmeter 17 and the sampling electronic flowmeter 19 are both connected with a laser modulation demodulation unit 1 through control lines.
The exhaust device comprises an exhaust pipe 22 and an exhaust pump 23, wherein the inlet of the exhaust pipe 22 is connected with the outlet 11 of the detection air chamber, and the exhaust pump 23 is arranged on the exhaust pipe 22.
The laser modulation and demodulation unit 1 is provided with a near infrared laser 24 capable of emitting light absorbed by HF gas, a laser temperature control circuit, a laser signal modulation circuit and a photoelectric signal demodulation circuit, and the central wavelength of the laser 24 includes, but is not limited to, 1278nm and 1310nm which can be absorbed by HF gas.
A detection method of an optical detection system for fluorinated thionyl gas comprises the following steps:
(1) the laser modulation and demodulation unit 1 controls the air electronic flowmeter 17 and the sampling electronic flowmeter 19, so that the flow ratio of air and the measured gas entering the reaction gas chamber cavity 12 is 1:1, after the gas to be detected is uniformly mixed with air in the reaction gas chamber cavity 12, the gas to be detected is catalyzed by a catalyst in the reaction gas chamber cavity 12, and SOF in the gas to be detected2The gas and the moisture contained in the air are fully chemically reacted to generate HF gas and SO2Gas, the reaction formula is: SOF2 + H2O =SO2+2HF。
(2) Opening the valve 20 on the reaction gas pipe 21, starting the exhaust pump 23, reacting the HF gas and SO generated in the reaction gas chamber 122Gas is introduced into the detection gas chamber cavity 6;
(3) the laser modulation and demodulation unit 1 controls a laser 24 to emit modulated laser with variable wavelength, the wavelength of the laser changes along the rule of an HF gas absorption peak, the laser is guided into a detection air chamber cavity 6 through an incident optical fiber 3, the laser is collimated into parallel light through an optical fiber collimator 7 and then emitted to a reflecting lens 9, the laser is emitted to a near infrared photoelectric detector 8 after being reflected by the reflecting lens 9, the near infrared photoelectric detector 8 converts an absorbed optical signal into an electric signal and transmits the signal to the laser modulation and demodulation unit 1 through an emergent signal cable 4, and data are displayed by a display unit 2; the laser modulation and demodulation unit 1 calculates the concentration of HF gas in the gas outlet chamber by detecting the absorbed photoelectric absorption signal and an inversion algorithm, and then back calculates the SOF in the sample gas by the air quantity recorded by the air electronic flowmeter 17 and the measured gas quantity recorded by the sampling electronic flowmeter 192The content of gas;
(4) the gas in the detection chamber 6 is pumped out by the exhaust pump 23 and is discharged through the exhaust port of the exhaust pipe 22.
The foregoing embodiments illustrate the principles and features of the present invention, but the above description is only illustrative of the preferred embodiments of the present invention and is not meant to be limiting of the embodiments. In the light of this patent, those skilled in the art can make various changes and modifications without departing from the spirit of the utility model and the scope of the appended claims. Therefore, the patent and protection scope of the present invention should be subject to the appended claims.
Claims (5)
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| CN202121444499.7U CN215812406U (en) | 2021-06-28 | 2021-06-28 | Optical detection system for thionyl fluoride gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552093A (en) * | 2021-06-28 | 2021-10-26 | 国网重庆市电力公司电力科学研究院 | Optical detection system and method for thionyl fluoride gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552093A (en) * | 2021-06-28 | 2021-10-26 | 国网重庆市电力公司电力科学研究院 | Optical detection system and method for thionyl fluoride gas |
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