CN218098832U - Gas detection system - Google Patents
Gas detection system Download PDFInfo
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- CN218098832U CN218098832U CN202221762824.9U CN202221762824U CN218098832U CN 218098832 U CN218098832 U CN 218098832U CN 202221762824 U CN202221762824 U CN 202221762824U CN 218098832 U CN218098832 U CN 218098832U
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Abstract
The utility model discloses a gas detection system, which comprises a single-point detector, an infrared laser, a light absorption cell and an infrared detector, wherein the light absorption cell and the infrared detector are sequentially arranged on the light path of the infrared laser; the photoacoustic spectrum detector comprises a wide-spectrum light source module, a photoacoustic cell arranged on the wide-spectrum light source module and a microphone arranged on the side wall of the photoacoustic cell; the degassing device comprises a degassing chamber, an oil body channel and an air inlet channel, wherein the degassing chamber is used for carrying out oil-gas separation on oil bodies of the transformer to obtain gas to be tested; and the control module is in communication connection with the single-point detector, the degassing device and the photoacoustic spectrum detector respectively and is used for controlling the single-point detector, the photoacoustic spectrum detector and the degassing device to work and determining the gas component and the gas content of the gas to be detected according to the signals collected by the single-point detector and the photoacoustic spectrum detector. The utility model discloses can improve the accuracy of measurement to gas based on optoacoustic spectroscopy.
Description
Technical Field
The utility model relates to an electrical system technical field, in particular to gaseous detecting system.
Background
Once a power transformer fails, power interruption can be caused, even fire can be caused in serious conditions, and serious consequences are brought to social life and economic development. The state and fault diagnosis of the power transformer can be accurately and comprehensively analyzed by analyzing the content of the dissolved gas in the oil. In the method for analyzing the gas content in oil, the photoacoustic spectroscopy detection technology based on the photoacoustic effect is a novel application mode, the gas in oil is decomposed in an oil-gas separation mode, and after the photoacoustic effect is formed by different gases and infrared light with different wavelengths, the photoacoustic effect is collected through a microphone and data processing is carried out to judge the type and the content of the gas.
There are also some disadvantages with the current technology. First, photoacoustic spectroscopy is unresponsive to diatomic molecules (e.g., H) 2 ) (ii) a Secondly, the gas separated from the transformer oil comprises methane (CH) 4 ) Ethylene (C) 2 H 4 ) Ethane (C) 2 H 6 ) Hydrogen (H) 2 ) Carbon monoxide (CO) and carbon dioxide (CO) 2 ) Water (H) 2 0) Acetylene (C) 2 H 2 ) The infrared absorption wavelengths corresponding to different gases are not completely independent, and the different gases are easy to interfere with each other, particularly, the infrared absorption wavelength of H2O molecules has large influence, and noise is generated for higher or lower waves; in addition, the photothermal phenomenon generated by part of the gas is weak, so that the measurement accuracy of the gas is still low based on the photoacoustic spectroscopy at present。
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in that it is still lower to the measurement accuracy of gas based on photoacoustic spectrometry at present, to prior art's not enough, provides a gas detection system.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts as follows:
a gas detection system for use in the detection of dissolved gas in transformer oil, comprising:
the single-point detector comprises a middle infrared laser, a light absorption cell and an infrared detector, wherein the light absorption cell and the infrared detector are sequentially arranged on a light path of the infrared laser;
the photoacoustic spectrum detector comprises a wide-spectrum light source module, a photoacoustic cell arranged on the wide-spectrum light source module and a microphone arranged on the side wall of the photoacoustic cell;
the degassing device comprises a degassing chamber, an oil body channel and an air inlet channel, wherein the degassing chamber is used for carrying out oil-gas separation on oil bodies of the transformer to obtain gas to be detected, the oil body channel is connected with the degassing chamber and the transformer, and the air inlet channel is respectively communicated with the photoacoustic cell and the light absorption cell;
and the control module is respectively in communication connection with the single-point detector, the degassing device and the photoacoustic spectrum detector and is used for controlling the single-point detector, the photoacoustic spectrum detector and the degassing device to work and determining the gas composition and the gas content of the gas to be detected according to the signals collected by the single-point detector and the photoacoustic spectrum detector.
Optionally, the mid-infrared laser includes a laser transmitter, and a laser control module in communication connection with the mid-infrared laser.
Optionally, the wide-spectrum light source module includes a wide-spectrum light source, and a light path processing unit disposed on the light path of the wide-spectrum light source.
Optionally, the light path processing unit includes a focusing lens, an optical chopper, and a filter disk, which are sequentially disposed on the light path of the wide-spectrum light source.
Optionally, the light absorption cell includes a first entrance window and an exit window disposed on the optical path of the infrared laser;
the photoacoustic cell includes a second incidence window disposed on a light path of the broad spectrum light source.
Optionally, the first injection window, the injection window and/or the second injection window is zinc selenide window glass.
Optionally, the gas inlet channel further comprises a plate-shaped portion connected to the degasser, a first extension portion extending outward from the plate-shaped portion and connected to the light absorption cell, and a second extension portion extending outward from the plate-shaped portion and connected to the photoacoustic cell.
Optionally, the degassing device further comprises a first solenoid valve provided to the plate-shaped portion;
the light absorption cell and/or the photoacoustic cell further comprise an exhaust passage for exhausting the gas to be measured and a second electromagnetic valve for controlling the exhaust passage.
Optionally, the control module includes a first signal processing unit, a second signal processing unit and a control unit;
the first signal processing unit is in communication connection with the microphone and the optical chopper respectively, the second signal processing unit is in communication connection with the infrared detector and the laser emitter respectively, and the control unit is in communication connection with the first signal processing unit and the second signal processing unit respectively.
Optionally, the first signal processing unit and/or the second signal processing unit comprises a lock-in amplifier.
Has the advantages that: compared with the prior art, the utility model provides a gas detection system, gas detection device includes single-point detector, optoacoustic spectrum detector, degasser and control module, degasser can extract gaseous in the transformer oil of transformer to transmit to single-point detector and optoacoustic spectrum detector, single-point detector can carry out laser absorption's collection to the gas that individual easily received the interference, and optoacoustic spectrum detector can be based on wide spectrum light source module, carry out vibration signal's collection to a plurality of gases, carry out the analysis to the signal of gathering at last, confirm gas composition and gas content in the transformer oil. The scheme can realize more accurate detection result and can obtain more accurate detection result for the gas with interference.
Drawings
Fig. 1 is a schematic structural diagram of the gas detection system provided by the present invention.
The meanings marked in the drawings are as follows:
10, a single point detector; 20, a photoacoustic spectroscopy detector; 30, a control module; 40, a degassing device; 11, a laser transmitter; 12, a light absorption cell; 13, an infrared detector; 14, an emission window; 15, a first injection window; 16, a laser control module; 21, a photoacoustic cell; 22, a microphone; 24, a second entrance window; 231, a broad spectrum light source; 232, a focusing lens; 233, an optical chopper; 234, a filter wheel; 30, a control module; 31, a first signal processing unit; 32, a second signal processing unit; 33, a control unit; 41, a degassing chamber; 42, an oil inlet channel; 43, an oil outlet channel; 44, an intake passage.
Detailed Description
The utility model provides a gas detection system, for making the utility model discloses a purpose, technical scheme and effect are clearer, make clear and definite, and it is right that the following refers to the attached drawing and the embodiment of lifting the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Research shows that the measurement accuracy of gases based on photoacoustic spectroscopy is still low at present. To this end, a gas detection system is provided that combines photoacoustic spectroscopy with single laser detection.
The following description of the embodiments will further explain the present invention by referring to the figures.
As shown in fig. 1, the present embodiment provides a gas detection system, in which solid arrows indicate the flowing direction of gas, dashed arrows indicate the optical path of light beams, and dashed connections between elements indicate that there are communication connections with each other, and the gas detection is used for detecting the composition and content of gas in transformer oil, so as to detect the safety of the transformer, and to find and locate faults.
The gas detection system includes a single point detector 10, a photoacoustic spectroscopy detector 20, a control module 30, and a degasser 40. The single point detector 10 uses a single laser to individually detect certain interfering gases. The photoacoustic spectroscopy detector 20 is a photoacoustic spectroscopy-based detector, and mainly utilizes that under the stimulation of laser light with a certain wavelength, gas absorbs light energy and is excited back in a mode of releasing heat energy, the released heat energy causes the sample and the surrounding medium to generate periodic heating according to the modulation frequency of the light, so that the medium generates periodic pressure fluctuation, and the measurement of the type and concentration of the gas is realized through the detection of the fluctuation. The degasser 40 is used for obtaining an oil sample in the transformer, and extracting gas to be detected in the transformer oil by adopting an oil-gas separation mode for subsequent detection. And the control module 30 controls the operation of the single-point detector 10, the photoacoustic spectrum detector 20 and/or the degassing device 40, and processes and analyzes the data collected by the single-point detector 10 and the photoacoustic spectrum detector 20 to perform qualitative and quantitative analysis on the gas in the transformer oil.
The single point detector 10 includes a mid-infrared laser, a light absorption cell 12 and an infrared detector 13. A beam of infrared rays with specific wavelength is irradiated on the gas to be detected, and some molecules in the gas to be detected can absorb the infrared rays with the specific wavelength to form an infrared absorption spectrum of the molecules. Mid-infrared lasers are used to emit infrared radiation at a specific wavelength. The optical absorption cell 12 is a container for carrying a sample for optical characteristic analysis, and in this embodiment, the optical absorption cell 12 is used for accommodating the extracted gas to be measured. The infrared detector 13 is capable of absorbing infrared radiation of different wavelengths in the environment and its intensity.
The light absorption cell 12 comprises a first incidence window 15 and an emission window 14, the light absorption cell 12 and the infrared detector 13 are sequentially arranged on a light path of the intermediate infrared laser, infrared rays emitted by the intermediate infrared laser enter the light absorption cell 12 through the first incidence window 15, pass through the light absorption cell 12, and exit the light absorption cell 12 through the emission window 14 to reach the infrared detector 13, and the infrared detector 13 records the intensity of the infrared rays with specific wavelengths. If the gas to be measured absorbs part of the infrared ray, the infrared ray passing through the light absorption cell 12 lacks part of the wavelength of the laser light, and therefore the intensity change of the infrared ray before and after entering the light absorption cell 12 is compared. According to the specific absorption wavelengths corresponding to different gases, the gas contained in the gas to be measured in the optical absorption cell 12 and the concentration of the gas can be determined. The intermediate infrared laser in this embodiment includes a laser transmitter 11 and a laser control module 16, and the laser control module 16 is in communication connection with the laser transmitter 11 to control the laser transmitter 11 to emit infrared rays with specific intensity and wavelength. The laser transmitter 11 may use a single wavelength of mid-infrared laser light. The first entrance window 15 piece and the exit window 14 piece may employ zinc selenide window glass.
The photoacoustic spectrum detector 20 includes a photoacoustic cell 21, a microphone 22, and a broad spectrum light source module. The photoacoustic cell 21 is a core device in the photoacoustic spectroscopy gas detection system, and can be in the shape of a symmetrical resonant cavity with a cylindrical and near horn-shaped end, a T-shaped photoacoustic cell, an oval photoacoustic cell based on quartz enhanced photoacoustic spectroscopy, and the like. Taking a cylindrical photoacoustic cell with cylindrical buffer cavities on both sides as an example, as shown in fig. 1, in the photoacoustic cell 21, cylindrical cavities are provided at both ends, and a connecting channel for passing laser light is provided between the two cylindrical cavities. An air inlet can be arranged on the cylindrical cavity at one side, and the gas to be measured can flow into the cylindrical wall body from the air inlet. The microphone 22 is a device capable of converting mechanical wave energy into electrical energy. When the mechanical wave passes through the microphone 22, the microphone 22 can make the current change correspondingly with the change of the mechanical wave to generate an electric signal. The broad spectrum light source module is used for generating a light beam which is emitted into the photoacoustic cell 21. The second entrance window is located on the light path of the broad spectrum light source module, and the light beam emitted by the broad spectrum light source module can pass through the second entrance window 24 and enter the photoacoustic cell 21. Different from a single-point laser, the wide-spectrum light source module can generate light beams with a wide wavelength range, and the microphone 22 can collect mechanical movement of gas in the photoacoustic cell 21 caused by laser with different wavelengths, so that photoacoustic spectra corresponding to the gas to be measured are collected. The second entrance window 24 may be made of zinc selenide window glass.
The degassing device 40 includes a degassing chamber 41, an oil inlet passage 42, an oil outlet passage 43, and an air inlet passage 44, the oil inlet passage 42 is used for sucking the transformer oil in the transformer into the degassing chamber 41, and the oil outlet passage 43 is used for discharging the transformer oil back into the transformer, so as to achieve recycling of the transformer oil. The degassing chamber 41 can realize oil-gas separation, and the degassing chamber 41 can adopt an oil-gas separation membrane, vacuum degassing and other modes. The gas inlet channel 44 is respectively connected with the light absorption cell 12 and the photoacoustic cell 21 to introduce the gas to be measured into the light absorption cell 12 and the photoacoustic cell 21. The control module 30 is respectively connected with the single-point detector 10, the degassing device 40 and the photoacoustic spectrum detector 20 in a communication manner, so as to control the starting of the detection of the gas to be detected by the single-point detector 10, the sucking of the transformer oil into the transformer by the degassing device 40 and the starting of the detection of the gas to be detected by the photoacoustic spectrum detector 20. The whole device works as follows:
based on the oil inlet channel 42, the control module 30 controls the degassing device 40 to suck transformer oil from the transformer, the transformer oil is subjected to oil-gas separation in the degassing chamber 41 to obtain a gas to be detected, and the gas to be detected enters the photoacoustic cell 21 of the photoacoustic spectrometry detector 20 and the light absorption cell 12 of the single-point laser through the gas inlet channel 44. When the gas to be measured enters the photoacoustic cell 21, the wide-spectrum light source module emits laser to the photoacoustic cell 21, the laser of the wide-spectrum light source module enters the second incidence window 24 through the second incidence window 24 to generate a photoacoustic spectrum effect, and the photoacoustic spectrum effect is collected by the microphone 22 and transmitted to the control processing module. According to the intensity of mechanical signals caused by the lasers with different wavelengths collected by the microphone 22, the processing module is controlled to determine the components and the concentration in the gas to be detected.
When the gas to be detected enters the light absorption cell 12, the laser emitter 11 emits infrared rays to the first entrance window 15, enters the light absorption cell 12, passes through the exit window 14, is detected by the infrared detector 13, and is transmitted to the control processing module. For the gas to be detected in the light absorption cell 12, the processing module is controlled to determine the content of one or more gases in the gas to be detected according to the relationship between the light absorption intensity of the gas to be detected to a specific wavelength and the content of the substance to be detected.
The present embodiment can separately detect the gases interfering with each other by two detection methods. For example, the methane gas interferes with the detection of other gases, and therefore, the single-point laser is used for monitoring in the optical absorption cell 12, thereby improving the detection accuracy of methane. And for other gases with small interference, the photoacoustic spectrum can be directly adopted for wide detection.
Further, in order to avoid mutual interference between mechanical vibrations generated by lasers with different wavelengths, in this embodiment, the wide-spectrum light source module includes a wide-spectrum light source 231 and a light path processing unit disposed on a light path of the wide-spectrum light source 231, and the light path processing unit can process the light beam emitted by the wide-spectrum light source 231, for example, the light path processing unit includes a filter disk 234, and a plurality of filters are disposed on the filter disk 234, and each filter filters a part of the wavelength light beam in the laser emitted by the wide-spectrum light source module, and only allows a specific wavelength light beam to pass through. In addition, the optical path processing unit may be provided with an optical chopper 233, and when the optical chopper 233 operates, the optical chopper 233 applies pulse modulation to the optical signal emitted from the broad spectrum light source module, so that the gas to be measured is periodically heated at the modulation frequency of light, and a photoacoustic spectrum is generated. In order to ensure that the laser light emitted from the wide-spectrum light source 231 can be accurately incident on the second incident window 24 and the optical filter, the optical path processing unit further includes a focusing lens 232. In one implementation, the optical path processing unit of the wide-spectrum light source 231 includes a focusing lens 232, an optical chopper 233, and a filter wheel 234, which are sequentially disposed on the optical path of the wide-spectrum light source 231. The wide-spectrum light source 231 may be a wide-spectrum mid-infrared light source, and the focusing lens 232 may be an infrared focusing lens 232.
In operation, taking the wide infrared spectrum light source 231 as an example, the wide infrared spectrum light source 231 emits light with a mid-infrared wavelength, the light passes through the infrared focusing lens 232 and then converges the laser, the laser passes through the optical chopper 233 and then modulates the light signal into a sine wave signal, the sine wave signal passes through the filter disk 234 and then filters the laser, the filter disk 234 has filters with different wavelengths and is corresponding to methane (CH) in oil 4 ) Ethylene (C) 2 H 4 ) Ethane (C) 2 H 6 ) Hydrogen (H) 2 ) Carbon monoxide (CO), carbon dioxide (CO) 2 ) Water (H) 2 O), acetylene (C) 2 H 2 ) The absorption wavelength of the gas is equal, and finally enters the photoacoustic cell 21.
Further, in order to arrange the devices more compactly and save materials, the gas inlet channel 44 of the degassing device 40 is T-shaped, and specifically includes a plate-shaped portion connected to the degassing device 40, a first extension portion extending outward from the plate-shaped portion and connected to the light absorption cell 12, and a second extension portion extending outward from the plate-shaped portion and connected to the photoacoustic cell 21. The gas to be measured enters the first and second extension portions through the plate-shaped portion, and enters the light absorption cell 12 from the first extension portion, and enters the photoacoustic cell 21 from the second extension portion. The light absorption cell 12 and/or the photoacoustic cell 21 further include an exhaust passage for exhausting the gas to be measured out of the chamber. In order to control the inflow and outflow time of the gas to be measured to form a closed space for detection, a first electromagnetic valve may be provided on the plate-shaped portion, and a second exhaust valve may be provided on the exhaust passage.
Further, the control module 30 includes a first signal processing unit 31, a second signal processing unit 32, and a control unit 33 communicatively connected to the first signal processing unit 31 and the second signal processing unit 32, respectively. The first signal processing unit 31 is respectively connected with the microphone 22 and the optical chopper 233 in a communication manner, the microphone 22 transmits the collected signals to the first signal processing unit 31, and meanwhile, signals generated by rotation of the optical chopper 233 in the wide-spectrum light source can also be transmitted to the first signal processing unit 31. In this embodiment, the first signal processing unit 31 may employ a lock-in amplifier, the lock-in amplifier may be in communication connection with the microphone 22 and the optical chopper 233, respectively, and according to a signal input to the lock-in amplifier by the optical chopper 233, the lock-in amplifier may perform noise reduction on the signal collected by the microphone 22, improve the signal-to-noise ratio, and increase the intensity of the weak signal. Meanwhile, the second signal processing unit 32 is in communication connection with the infrared detector 13 and the laser control module 16, and the second signal processing unit 32 may also use a lock-in amplifier to amplify the collected signal according to the laser control module 16. The first signal processing unit 31 and the second signal processing unit 32 are both in communication connection with the control unit 33, and send the processed signals to the control unit 33, so that the control unit 33 can process the acquired signals conveniently and calculate the corresponding gas concentration.
In addition, in this embodiment, the control unit 33 may further be in communication connection with the laser control module 16 to indirectly control the time when the laser emitter 11 emits the laser, and the control module 30 is also in communication connection with the wide-spectrum light source module to control the time when the wide-spectrum light source 231 emits the laser.
The invention has high structural integration degree and convenient use. The advantages of the gas content detection technology of photoacoustic spectroscopy and mid-infrared single-point laser are combined, two measurement modes can be freely arranged to measure the gas to be separately measured, and the gas measurement precision is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A gas detection system for use in the detection of dissolved gas in transformer oil, comprising:
the single-point detector comprises a middle infrared laser, a light absorption cell and an infrared detector, wherein the light absorption cell and the infrared detector are sequentially arranged on a light path of the infrared laser;
the photoacoustic spectrum detector comprises a wide-spectrum light source module, a photoacoustic cell arranged on the wide-spectrum light source module and a microphone arranged on the side wall of the photoacoustic cell;
the degassing device comprises a degassing chamber, an oil body channel and an air inlet channel, wherein the degassing chamber is used for carrying out oil-gas separation on oil bodies of the transformer to obtain gas to be detected, the oil body channel is connected with the degassing chamber and the transformer, and the air inlet channel is respectively communicated with the photoacoustic cell and the light absorption cell;
and the control module is respectively in communication connection with the single-point detector, the degassing device and the photoacoustic spectrum detector and is used for controlling the single-point detector, the photoacoustic spectrum detector and the degassing device to work and determining the gas composition and the gas content of the gas to be detected according to the signals collected by the single-point detector and the photoacoustic spectrum detector.
2. The gas detection system of claim 1, wherein the mid-infrared laser comprises a laser transmitter, and a laser control module communicatively coupled to the mid-infrared laser.
3. The gas detection system of claim 2, wherein the broad spectrum light source module comprises a broad spectrum light source and an optical path processing unit disposed on the broad spectrum light source optical path.
4. The gas detection system of claim 2, wherein the light absorption cell comprises a first entrance window and an exit window disposed in the optical path of the infrared laser;
the photoacoustic cell includes a second incidence window disposed on a light path of the broad spectrum light source.
5. The gas detection system of claim 4, wherein the first injection window, the exit window, and/or the second injection window is zinc selenide window glass.
6. The gas detection system of claim 1, wherein the gas inlet channel further comprises a plate portion coupled to the degasser, a first extension portion extending outward from the plate portion and coupled to the light absorption cell, and a second extension portion extending outward from the plate portion and coupled to the photoacoustic cell.
7. The gas detection system according to claim 6, wherein the degasser further comprises a first solenoid valve provided to the plate-like portion;
the light absorption cell and/or the photoacoustic cell further comprise an exhaust passage for exhausting the gas to be measured, and a second electromagnetic valve for controlling the exhaust passage.
8. The gas detection system according to claim 3, wherein the optical path processing unit includes a focusing lens, an optical chopper, and a filter wheel, which are sequentially disposed on the optical path of the wide spectrum light source.
9. The gas detection system of claim 8, wherein the control module comprises a first signal processing unit, a second signal processing unit, and a control unit, respectively;
the first signal processing unit is in communication connection with the microphone and the optical chopper respectively, the second signal processing unit is in communication connection with the infrared detector and the laser emitter respectively, and the control unit is in communication connection with the first signal processing unit and the second signal processing unit respectively.
10. The gas detection system of claim 9, wherein the first signal processing unit and/or the second signal processing unit comprises a lock-in amplifier.
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| CN202221762824.9U CN218098832U (en) | 2022-07-07 | 2022-07-07 | Gas detection system |
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| CN202221762824.9U CN218098832U (en) | 2022-07-07 | 2022-07-07 | Gas detection system |
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| CN218098832U true CN218098832U (en) | 2022-12-20 |
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