CN116046280A - Online monitoring system and method for greenhouse gas leakage in GIL equipment - Google Patents
Online monitoring system and method for greenhouse gas leakage in GIL equipment Download PDFInfo
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- G01M3/00—Investigating fluid-tightness of structures
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Abstract
The invention discloses an online monitoring system and method for greenhouse gas leakage in GIL equipment, wherein the scheme can comprise the following steps: the system comprises a QCLAS detection unit array arranged in a space where the GIL equipment is deployed, wherein the QCLAS detection unit array is used for carrying out on-line monitoring on greenhouse gases leaked by an integral pipeline of the GIL equipment, and comprises a plurality of QCLAS detection units, and the range of a superposition area of the detection ranges of two adjacent QCLAS detection units is smaller than a preset range; the cloud server is used for calculating greenhouse gas concentration data leaked out by the GIL equipment in the local area to which each QCLASE detection unit belongs according to the detection data of each QCLASE detection unit; the QCLASE detection unit comprises an FPGA module, a QCL laser system, a first stepping motor, a second stepping motor, a pressure sensor, a temperature sensor, a first vibrating mirror and a second vibrating mirrorAnd (5) vibrating the mirror. The technical scheme of the invention can monitor whether SF exists in the application scene of the GIL with longer pipeline length in real time on line 6 The gas leakage problem accurately positions the leakage position.
Description
Technical Field
The invention relates to the technical field of greenhouse gases, in particular to an online monitoring system and method for greenhouse gas leakage in GIL equipment.
Background
The gas-insulated metal-enclosed transmission line is one of electric equipment, and because the underground transmission line does not have enough space to erect high-voltage lines, the concentrated transmission equipment has high insulation requirement and SF (sulfur hexafluoride) 6 Because of its good insulation, gas is often used to create an insulating environment for transmission lines. SF (sulfur hexafluoride) 6 The gas is a kind of greenhouse gas, and the toxic gas generated by leakage of the gas can cause people who leak the gas to quickly asphyxate and even die, so that the gas is used for SF 6 The detection of gas leakage is important. Currently, in order to determine whether an SF exists in an electrical device 6 The method for detecting gas leakage is mainly divided into two types, namely, SF is directly detected 6 Detection of gases, another type is for SF 6 The products of the decomposition are detected. Direct pair SF 6 The method for detecting the gas comprises an acoustic wave method, a high insulation method, an electrochemical method, a relay density measurement method and the like. For SF 6 The method for detecting the decomposed products comprises a Fourier infrared spectrometry, a non-dispersive infrared spectrometry, an electrochemical gas sensor method, a tunable semiconductor laser method and the like. However, due to SF 6 The decomposed gas products are various, and are specific to SF 6 The way of indirectly measuring the decomposition products of the gas sensor can meet the problems of multi-component gas detection, difficult identification of the gas decomposition products and the like. And to SF 6 The difficulty of the direct gas detection method is that in the application of GIL, the pipeline length is too long, so that it is difficult to install gas leakage sensors in each pipeline, and most of the SF pairs 6 The gas detection is based on extraction gas type sensing, but this cannot be satisfied for SF in GIL scenarios 6 The detection speed and the high standard requirement of accurate positioning of the real-time leakage detection of the gas.
Therefore, it is necessary to provide a greenhouse suitable for the application scene of GIL equipment with long pipeline lengthGases, e.g. SF 6 The gas detection method is used for carrying out real-time on-line monitoring on the gas leakage condition of the GIL equipment and can quickly read and locate leakage points.
Disclosure of Invention
The invention provides an online monitoring system and method for greenhouse gas leakage in GIL equipment, which are used for overcoming at least one technical problem in the prior art.
According to a first aspect of an embodiment of the present invention, there is provided an online monitoring system for greenhouse gas leakage in GIL equipment, comprising:
the system comprises a QCLAS detection unit array arranged in a space where the GIL equipment is deployed, wherein the QCLAS detection unit array is used for carrying out on-line monitoring on greenhouse gases leaked by an integral pipeline of the GIL equipment, the QCLAS detection unit array comprises a plurality of QCLAS detection units, and the range of a superposition area of detection ranges of two adjacent QCLAS detection units in the QCLAS detection unit array is smaller than a preset range;
the cloud server is used for receiving the detection data of each QCLASS detection unit in the QCLASS detection unit array and calculating greenhouse gas concentration data leaked out by GIL equipment in a local area to which each QCLASS detection unit belongs according to the detection data of each QCLASS detection unit;
the QCLAS detection unit comprises an FPGA module, a QCL laser system, a first stepping motor, a second stepping motor, a pressure sensor, a temperature sensor, a first vibrating mirror and a second vibrating mirror; the first stepping motor is used for driving the first vibrating mirror to rotate, the second stepping motor is used for driving the second vibrating mirror to rotate, and the positions of the first vibrating mirror and the second vibrating mirror are kept orthogonal in the rotating process; the QCL laser system is used for emitting detection laser for detecting greenhouse gases, the first vibrating mirror is used for reflecting the detection laser to the second vibrating mirror, and the second vibrating mirror is used for reflecting the detection laser to a region to be detected; the FPGA module is used for cooperatively controlling the working processes of the first driving motor, the second driving motor and the QCL driver in the QCL laser system; the pressure sensor is used for sending the pressure data to the cloud server after detecting the pressure data of the area to be detected, and the temperature sensor is used for sending the temperature data to the cloud server after detecting the temperature data of the area to be detected.
Preferably, the system further comprises user layer software, wherein the user layer software is used for controlling the communication module to receive the greenhouse gas concentration data leaked by the GIL equipment in the local area, and then displaying the greenhouse gas concentration data through a display unit arranged in a central control room, and the greenhouse gas concentration data leaked by the GIL equipment in the local area is sent to the communication module by the cloud server.
Preferably, the system further comprises a virtual alarm unit for alarming when the greenhouse gas concentration data exceeds a predetermined gas concentration.
Preferably, the system further comprises a data storage unit for storing greenhouse gas concentration data leaked out of the GIL device in the local area.
Preferably, the QCL laser system comprises a QCL driver, a QCL laser, a function generator, a lock-in amplifier, a mid-infrared detector and a data acquisition card; the function generator is used for transmitting a low-frequency triangular wave signal, the lock-in amplifier is used for transmitting a high-frequency sine wave signal, and the wavelength of laser transmitted by the QCL laser is modulated after the low-frequency triangular wave signal and the high-frequency sine wave signal are overlapped; the QCL driver is used for driving the QCL laser, the middle infrared detector is used for receiving detection laser signals reflected back through the reflecting surface in the area to be detected, and the data acquisition card is used for processing the reflected detection laser signals.
According to a second aspect of the embodiment of the present invention, there is provided an online monitoring method for greenhouse gas leakage in GIL equipment, including:
loading high-frequency cosine modulation current on the driving current of a QCL laser system of each QLAS detection unit in the QLAS detection unit array, and modulating the emitted laser wavelength of the QCL laser system;
for any one QCLASS detection unit in the QCLASS detection unit array, driving a first vibrating mirror of the any one QCLASS detection unit by using a first stepping motor of the any one QCLASS detection unit to enable the first vibrating mirror to rotate, driving a second vibrating mirror of the any one QCLASS detection unit by using a second stepping motor of the any one QCLASS detection unit to enable the second vibrating mirror to rotate, and performing cooperative control on the first stepping motor and the second stepping motor by using an FPGA module of the any one QCLASS detection unit to enable the first vibrating mirror and the second vibrating mirror to keep orthogonal in the rotating process, so that emitted laser of the QCL laser system is reflected to the second vibrating mirror after being reflected by the first vibrating mirror, and then the second vibrating mirror performs 0-180 DEG rotation scanning on a to-be-detected area to which the any one QCLASS detection unit belongs;
measuring temperature data of a region to be detected by using a temperature sensor arranged in the region to be detected, and measuring pressure data of the region to be detected by using a pressure sensor arranged in the region to be detected;
and calculating the greenhouse gas concentration of the to-be-detected area by using a wavelength modulation spectrum method based on the temperature data and the pressure data for any QCLAS detection unit, and alarming a monitoring person when the greenhouse gas concentration exceeds a preset gas concentration so that the monitoring person further determines the to-be-detected area with the greenhouse gas leakage.
One embodiment of the present disclosure can achieve at least the following advantages: in the technical scheme, the QCLASS detection unit array for carrying out on-line monitoring on greenhouse gas leaked by the whole pipeline of the GIL equipment is arranged in the space where the GIL equipment is deployed, and the detection ranges of the two adjacent QCLASS detection units are overlapped, so that the detection range of the QCLASS detection unit array can completely cover the GIL equipment, thereby no dead angle is monitored, and the detection range is also used forThe range of the overlapping area is smaller than the preset range, so that the QCLASS detection units with the smallest number are arranged on the premise of covering the GIL equipment without dead angles. Meanwhile, the QCL laser system in the QCLS detection unit has stronger transmitting power of hundred milliwatts, so that the signal-to-noise ratio of signal extraction is effectively improved, the QCLS detection unit not only can realize the opposite-penetrating type optical path interval, but also can realize the remote sensing type structure that the laser and the detector are positioned at one side, and therefore, by applying the technical scheme of the invention, whether the GIL equipment has SF or not is monitored 6 When gas leaks and positions the leakage points, the effect similar to that of the monitoring camera is achieved on the use effect, namely whether the GIL equipment has SF can be monitored in real time 6 The gas leaks, and the leakage position can be positioned in real time, so that the monitoring personnel can take further measures.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an arrangement mode of a qlas detection unit array in a greenhouse gas leakage online monitoring system in GIL equipment according to an embodiment of the present disclosure;
FIG. 2 is a block diagram of an on-line monitoring system for greenhouse gas leakage in a GIL facility according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a detection range of a single QCLASE detection unit in an online monitoring system for greenhouse gas leakage in a GIL apparatus according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram showing SF in an on-line monitoring system for leakage of greenhouse gases in a GIL apparatus according to an embodiment of the present disclosure 6 A gas absorption line intensity diagram of the gas;
FIG. 5 is a schematic diagram of a QCL laser system used in an on-line monitoring system for greenhouse gas leakage in a GIL apparatus according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of the positions of the first galvanometer and the second galvanometer in a QCL laser system used in an on-line monitoring system for greenhouse gas leakage in GIL equipment according to an embodiment of the present disclosure;
FIG. 7 is a schematic flow chart of a method for online monitoring of greenhouse gas leakage in GIL equipment according to an embodiment of the disclosure.
Wherein 1 denotes a GIL pipe, 2 denotes a qcilas detecting unit, 3 denotes a detection range of the qcilas detecting unit, 4 denotes a leaked SF 6 Gas, 5, 6, 7, 8, and 8 represent a first stepper motor, a second stepper motor, a first galvanometer, and a second galvanometer.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of one or more embodiments of the present specification more clear, the technical solutions of one or more embodiments of the present specification will be clearly and completely described below in connection with specific embodiments of the present specification and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present specification. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are intended to be within the scope of one or more embodiments herein.
It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another.
SF 6 Gases are widely used in the electrical industry. SF (sulfur hexafluoride) 6 Electrical equipment (gas insulated switchgear GIS, gas insulated transformer GIT, long-distance gas insulated pipeline GIL, gas insulated breaker GCB, cable GIC and the like) is widely applied to the field of power transmission and distribution equipment due to the outstanding advantages of very good insulation and arc extinguishing characteristics, small occupied area, safe and reliable operation, long maintenance period and the like, and the working voltage of the electrical equipment covers all 35kV-1000kVA stage.
SF 6 The gas is one of six greenhouse gases which are discovered at present, and has serious pollution to the air. During the power transmission, abnormal local heating and high-power arc are generated in the equipment, which can lead to SF 6 The gas is decomposed to produce a plurality of solid and a plurality of toxic and corrosive gas decomposition products (H 2 S，HF，S 2 F 2 ，SF 4 ，S 2 F 10 ，SOF 2 ，SO 2 Etc.), these decomposition products are discharged into the atmosphere, which not only brings great pollution and damage to the living environment, but also affects the normal operation of the electrical equipment.
The foregoing describes whether or not there is SF in the electrical equipment 6 The method for detecting the gas leakage mainly comprises the steps of directly detecting SF 6 Detection and SF of gas 6 Method for detecting products of gas decomposition, in the prior art, SF 6 The way of indirectly measuring the decomposition products of the gas sensor can meet the problems of multi-component gas detection, difficult identification of the gas decomposition products and the like. And to SF 6 The difficulty of the direct gas detection method is that in the application of GIL, the pipeline length is too long, so that it is difficult to install gas leakage sensors in each pipeline, and most of the SF pairs 6 The gas detection is based on extraction gas type sensing, but this cannot be satisfied for SF in GIL scenarios 6 The detection speed and the high standard requirement of accurate positioning of the real-time leakage detection of the gas.
The invention provides a greenhouse gas leakage online monitoring system in GIL equipment, and provides a greenhouse gas leakage online monitoring method in the GIL equipment based on the system, which is suitable for SF under the application scene of GIL with longer pipeline length 6 The technical scheme of the invention can be used for monitoring whether SF exists or not in real time on line 6 And (3) gas leaks, and the leakage position is accurately positioned.
The basic principle according to the technical scheme of the invention is explained below, and the method mainly comprises the technology of detecting gas and tunable quantum cascade laser absorption spectrum based on an infrared spectrum absorption method, as shown in fig. 4, because gas molecules have spectral absorption characteristics in an infrared band and different components have different absorption center peaks, the concentration of the gas can be measured, and the components of the gas can be judged by the unique absorption spectrum fingerprint of the gas by detecting the gas through the infrared spectrum absorption method.
The QCL laser system in the qcilas detection unit, which may also be referred to as a quantum cascade laser (Quantum Cascade Laser, QCL), is a unipolar light source generated based on inter-band transitions between semiconductor coupled quantum well sub-bands, whose wavelength range can cover mid-to far-infrared and whose output power is on the order of mW to W. Because of the characteristics of high coherence, high directivity, high brightness and the like, the light-emitting diode is currently regarded as an ideal light-emitting device for detecting the middle infrared trace gas.
A tunable semiconductor laser (Tunable Diode Laser Absorption Spectroscopy, TDLAS) is a very powerful means of trace gas detection, employing a narrow-band tunable laser with a frequency close to the absorption line of the gas to be measured, using a frequency modulated laser to scan a certain characteristic line of the gas to be measured, the concentration of the gas being proportional to the absorption of the light intensity of the gas at a specific line according to the beer lambert law. And detecting laser signals after the gas to be detected is absorbed, and analyzing to calculate the concentration of the trace gas.
The tunable quantum cascade laser absorption spectrum (Quantum Cascade Laser Absorption Spectroscopy, qcilas) gas detection technology combines a quantum cascade laser and a tunable semiconductor laser gas detection technology, and the concentration of the gas is proportional to the light intensity absorption of the gas at a specific spectral line according to the beer lambert law. And detecting laser signals after the gas to be detected is absorbed, and analyzing to calculate the concentration of the trace gas. For the gas with the characteristic absorption spectrum line of the gas to be detected in the middle infrared and even the far infrared, the semiconductor laser used by the traditional TDLAS method cannot emit the laser of the required middle and far infrared, so that the QCL laser light source capable of covering the middle and far infrared wave band is adopted, and the gas concentration analysis is carried out by combining the technology of tuning the laser.
Next, an on-line monitoring system for greenhouse gas leakage in GIL devices provided for in the embodiments of the specification will be specifically described with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an arrangement mode of a qlas detection unit array in an online monitoring system for greenhouse gas leakage in GIL equipment according to an embodiment of the present disclosure, in fig. 1, 1 represents a GIL pipe, 2 represents a qlas detection unit, 3 represents a detection range of the qlas detection unit, and 4 represents leaked SF 6 And (3) gas. In the space where the GIL equipment is deployed, a qlas detecting unit array is arranged, and the qlas detecting unit array is used for on-line monitoring of greenhouse gas leaked from an overall pipeline of the GIL equipment, as shown in fig. 1, the qlas detecting unit array includes a plurality of qlas detecting units 2, and a range of a coincidence area of detection ranges of two adjacent qlas detecting units in the qlas detecting unit array is smaller than a predetermined range. Because the detection ranges of two adjacent QCLASS detection units are overlapped, the detection range of the QCLASS detection unit array can completely cover GIL equipment with longer pipeline length in the scheme, so that dead angle-free monitoring is realized, and the range of the overlapped area is smaller than the preset range, so that the QCLASS detection units with the least number are arranged on the premise of covering the GIL equipment without dead angles. It should be noted that, when the qlas detecting unit array is deployed, the distance between two adjacent qlas detecting units may be flexibly set according to the actual scene, so long as the detecting ranges of the two adjacent qlas detecting units have a certain degree of overlap ratio. As shown in fig. 3, fig. 3 is a schematic view of a detection range of a single qlas detection unit in the online monitoring system for greenhouse gas leakage in GIL equipment according to the embodiment of the present disclosure, and symbol 2 in fig. 3 indicates the qlas detection unit, and the detection range of the qlas detection unit can be seen in fig. 3.
The greenhouse gas leakage online monitoring system provided by the invention further comprises a cloud server (not shown in fig. 1, fig. 2 is an overall architecture diagram of the greenhouse gas leakage online monitoring system in GIL equipment provided by the embodiment of the present disclosure, the cloud server is shown in the overall architecture diagram shown in fig. 2), and the cloud server is used for receiving each qlas detection unit in the qlas detection unit arrayAnd calculating greenhouse gas concentration data of a local area to which each QCLAST detection unit belongs according to the detection data of each QCLAST detection unit. In a possible implementation manner, the FPGA module in the qlas detection unit to be described below sends the detection data of each qlas detection unit to the cloud server, and calculates the SF of the location corresponding to each qlas detection unit based on the powerful computing power of the cloud server 6 Concentration of gas, and SF of leakage is judged based on the concentration 6 When the gas exceeds the standard, the gas is absorbed by interaction with the target gas, detected by a photoelectric detector, converted into an electric signal, then input into a lock-in amplifier for demodulation, the demodulated signal is collected by a data collection card and then transmitted to a cloud server, and SF is obtained after calculation 6 And (5) detecting the gas concentration.
The qlas detecting unit in the embodiment is described below, and the qlas detecting unit includes an FPGA module, a QCL laser system, a first stepper motor, a second stepper motor, a pressure sensor, a temperature sensor, a first vibrating mirror, and a second vibrating mirror; the first stepping motor is used for driving the first vibrating mirror to rotate, the second stepping motor is used for driving the second vibrating mirror to rotate, and the rotation directions of the first vibrating mirror and the second vibrating mirror are orthogonal; the QCL laser system is used for emitting detection laser, and the detection laser sequentially passes through the first vibrating mirror and the second vibrating mirror to be reflected and then is detected in the region to be detected; the FPGA module is used for controlling the working processes of the first driving motor, the second driving motor and the QCL driver in the QCL laser system; the pressure sensor is used for sending the pressure data to the cloud server after detecting the pressure data of the area to be detected, and the temperature sensor is used for sending the temperature data to the cloud server after detecting the temperature data of the area to be detected, so that SF can be measured more accurately 6 Concentration value of gas. Wherein the first galvanometer, the first stepping motor and the second stepping motor are installed schematically as shown in fig. 6, in which 5 represents the first stepping motor, 6 represents the second stepping motor, 7 represents the first galvanometer, 8 represents the second galvanometer, and in which the first galvanometer 7 and the second galvanometerThe second galvanometer 8 is held in quadrature in orientation during rotation.
The system is based on a long-optical-path absorption gas concentration detection principle (Beer-Lambert law), wherein Beer-Lambert law is a theoretical basis of laser absorption spectrum, and represents the relation between the intensity of absorption of a substance to a certain monochromatic light and the concentration of the absorption substance, and when a beam of parallel monochromatic light passes through a uniform non-scattering sample, the absorbance of the sample to the light is in direct proportion to the concentration of the sample.
The phase-locked amplifier of the QCL laser system is utilized to carry out harmonic detection on photoelectric signals absorbed by target gas, namely, after a beam of monochromatic laser passes through a gas medium, the attenuation of the laser intensity follows the beer-lambert law,
wherein, symbol I t Indicating transmitted laser intensity, symbol I 0 The incident laser intensity, the laser frequency, the absorption, the ambient temperature, the line intensity of the absorption line, the total ambient pressure, the concentration of the target gas, the effective absorption optical path, the normalized linear function, and the normalized linear function are represented by the symbol v, the symbol αv, the symbol T, the symbol TK, and the symbol P. From the beer-lambert law, it is known that the volume concentration of the target gas in the mixed gas can be calculated by measuring the transmitted laser intensity, knowing the incident laser intensity, the absorption line intensity, the gas pressure, the effective absorption optical path and the linear function.
In the technical scheme, the QCLASdetection unit array for carrying out on-line monitoring on greenhouse gas leaked from the whole pipeline of the GIL equipment is arranged in the space where the GIL equipment is deployed, and the detection ranges of the two adjacent QCLASdetection units are overlapped, so that the detection range of the QCLASdetection unit array can completely cover the GIL equipment in the scheme, dead angle-free monitoring is achieved, and the range of the overlapped area is smaller than the preset range, so that the arrangement quantity is as small as possible on the premise of meeting the condition that the dead angle-free GIL equipment is coveredQlas detection unit of (a). Meanwhile, the QCL laser system in the QCLS detection unit has stronger transmitting power of hundred milliwatts, so that the signal-to-noise ratio of signal extraction is effectively improved, the QCLS detection unit not only can realize the opposite-penetrating type optical path interval, but also can realize the remote sensing type structure that the laser and the detector are positioned at one side, and therefore, by applying the technical scheme of the invention, whether the GIL equipment has SF or not is monitored 6 When gas leaks and positions the leakage points, the effect similar to that of the monitoring camera is achieved on the use effect, namely whether the GIL equipment has SF can be monitored in real time 6 The gas leaks, and the leakage position can be positioned in real time, so that the monitoring personnel can take further measures.
The present description examples also provide some specific embodiments of the method based on the system of fig. 1, as described below.
In an optional technical scheme, the system further comprises user layer software, wherein the user layer software is used for controlling the communication module to receive greenhouse gas concentration data leaked by the GIL equipment in the local area, and then displaying the greenhouse gas concentration data through a display unit arranged in a central control room, wherein the greenhouse gas concentration data leaked by the GIL equipment in the local area is sent to the communication module by the cloud server.
In this alternative, user layer software may be developed based on a computer programming language, which may have a graphical user interface displayed on a display unit within the central office, since the cloud server may calculate the SF of the area covered by each qlas detection unit based on the detection data of each qlas detection unit 6 The gas concentration data, and thus the user layer software can receive the SF of the area covered by each QCLASS detection unit calculated by the cloud server based on the communication module 6 Gas concentration data and SF for the area covered by each QCLAST detection unit 6 The gas concentration data is displayed, so that monitoring staff can visually and conveniently judge whether SF exists in the GIL equipment 6 Monitoring gas leakage and precisely locating which QCLAST detection unitSF for covered detection area 6 The gas leaks, thereby facilitating the monitoring personnel to take further measures.
In an alternative solution, the system further comprises a virtual alarm unit for alarming when the greenhouse gas concentration data exceeds a predetermined gas concentration. In this alternative, a virtual alarm unit may be set in the user layer software, and SF exists in the detection area covered by a certain qlas detection unit 6 SF for the one QCLASE detection unit in the graphical user interface when gas leaks 6 And alarming is carried out nearby the gas concentration data, so that monitoring personnel can find leakage conditions in time.
In an alternative embodiment, the system further comprises a data storage unit for storing greenhouse gas concentration data leaked out of the GIL device in the local area. In this scheme, for each SF detected by the QCLAST detection unit 6 The gas concentration data is stored and the stored data can be used for subsequent analysis, such as screening SF 6 The region with more gas leakage times can be further wrong, such as replacing parts of the GIL equipment in the region, thereby minimizing SF of the GIL equipment in the region 6 A gas leak event.
In an alternative technical scheme, as shown in fig. 5, the QCL laser system includes a QCL driver, a QCL laser, a function generator, a lock-in amplifier, a mid-infrared detector and a data acquisition card; the phase-locked amplifier is an electronic instrument for measuring dynamic signals, and mainly comprises a band-pass filter, a mixer and a low-pass filter. The working process is that the signal to be measured is input, amplified and band-pass filtered, then is input together with the reference signal into the mixer, and then is input into the low-pass filter for filtering and then is output. By using the principle of orthogonality, the phase and amplitude of a signal of a certain frequency can be measured from a signal which is submerged in noise, signals of non-selected frequencies (i.e. noise) are removed, and information of selected frequencies is retained. The middle infrared detector is one kind of photoelectric detector and is used to detect transmitted laser, and the photoelectric effect of matter is utilized to convert detected light signal into electric signal for amplification. In the QCL laser system, a function generator is used for transmitting a low-frequency triangular wave signal, a lock-in amplifier is used for transmitting a high-frequency sine wave signal, the wavelength of laser transmitted by the QCL laser is modulated after the low-frequency triangular wave signal and the high-frequency sine wave signal are overlapped, a QCL driver is used for driving the QCL laser, a middle infrared detector is used for receiving a detection laser signal reflected back through a reflecting surface in a region to be detected, and a data acquisition card is used for processing the reflected detection laser signal.
In this embodiment scheme, QCLAS detecting element adopts QCL laser as the light source to carry out gas detection, has following advantage: 1. an ultra-wide spectral range (midirtotthz) may be provided. 2: excellent wavelength tunability. 3: high power and high stability. 4: narrow linewidth. By reasonably selecting the wavelength, the measurement of various oxynitride compositions can be accomplished.
Based on the same thought, the embodiment of the specification also provides a corresponding method of the system. FIG. 7 is a schematic flow chart of a method for online monitoring of greenhouse gas leakage in a GIL apparatus corresponding to FIG. 1 according to an embodiment of the disclosure. As shown in fig. 7, the method may include:
and 702, loading high-frequency cosine modulation current on the driving current of the QCL laser system of each QLAS detection unit in the QLAS detection unit array, and modulating the emission laser wavelength of the QCL laser system.
Step 704: for any one QCLASS detection unit in the QCLASS detection unit array, a first stepping motor of the any one QCLASS detection unit is used for driving a first vibrating mirror of the any one QCLASS detection unit, so that the first vibrating mirror rotates, a second stepping motor of the any one QCLASS detection unit is used for driving a second vibrating mirror of the any one QCLASS detection unit, so that the second vibrating mirror rotates, an FPGA module of the any one QCLASS detection unit is used for cooperatively controlling the first stepping motor and the second stepping motor, so that the first vibrating mirror and the second vibrating mirror keep orthogonal in the rotating process, and emitted laser of the QCL laser system is reflected to the second vibrating mirror after being reflected by the first vibrating mirror, and then the second vibrating mirror performs 0-180 DEG rotation scanning on a to-be-detected area to which the any one QCLASS detection unit belongs.
Step 706: and measuring the temperature data of the region to be detected by using a temperature sensor arranged in the region to be detected, and measuring the pressure data of the region to be detected by using a pressure sensor arranged in the region to be detected.
Step 708: and calculating the greenhouse gas concentration of the to-be-detected area by using a wavelength modulation spectrum method based on the temperature data and the pressure data for any QCLAS detection unit, and alarming a monitoring person when the greenhouse gas concentration exceeds a preset gas concentration so that the monitoring person further determines the to-be-detected area with the greenhouse gas leakage.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
Those of ordinary skill in the art will appreciate that: the modules in the apparatus of the embodiments may be distributed in the apparatus of the embodiments according to the description of the embodiments, or may be located in one or more apparatuses different from the present embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. An on-line monitoring system for greenhouse gas leakage in a GIL plant, the system comprising:
the system comprises a QCLAS detection unit array arranged in a space where the GIL equipment is deployed, wherein the QCLAS detection unit array is used for carrying out on-line monitoring on greenhouse gases leaked by an integral pipeline of the GIL equipment, the QCLAS detection unit array comprises a plurality of QCLAS detection units, and the range of a superposition area of detection ranges of two adjacent QCLAS detection units in the QCLAS detection unit array is smaller than a preset range;
the cloud server is used for receiving the detection data of each QCLASS detection unit in the QCLASS detection unit array and calculating greenhouse gas concentration data leaked out by GIL equipment in a local area to which each QCLASS detection unit belongs according to the detection data of each QCLASS detection unit;
the QCLAS detection unit comprises an FPGA module, a QCL laser system, a first stepping motor, a second stepping motor, a pressure sensor, a temperature sensor, a first vibrating mirror and a second vibrating mirror; the first stepping motor is used for driving the first vibrating mirror to rotate, the second stepping motor is used for driving the second vibrating mirror to rotate, and the positions of the first vibrating mirror and the second vibrating mirror are kept orthogonal in the rotating process; the QCL laser system is used for emitting detection laser for detecting greenhouse gases, the first vibrating mirror is used for reflecting the detection laser to the second vibrating mirror, and the second vibrating mirror is used for reflecting the detection laser to a region to be detected; the FPGA module is used for cooperatively controlling the working processes of the first driving motor, the second driving motor and the QCL driver in the QCL laser system; the pressure sensor is used for sending the pressure data to the cloud server after detecting the pressure data of the area to be detected, and the temperature sensor is used for sending the temperature data to the cloud server after detecting the temperature data of the area to be detected.
2. The system of claim 1, further comprising user layer software for controlling a communication module to receive greenhouse gas concentration data leaked out of GIL devices in the local area, and displaying the greenhouse gas concentration data through a display unit disposed in a central control room, wherein the greenhouse gas concentration data leaked out of GIL devices in the local area is transmitted to the communication module by the cloud server.
3. The system of claim 2, further comprising a virtual alarm unit for alerting when the greenhouse gas concentration data exceeds a predetermined gas concentration.
4. The system of claim 2, further comprising a data storage unit for storing greenhouse gas concentration data leaked out of GIL equipment in the local area.
5. The system of claim 1, wherein the QCL laser system comprises a QCL driver, a QCL laser, a function generator, a lock-in amplifier, a mid-infrared detector, and a data acquisition card; the function generator is used for transmitting a low-frequency triangular wave signal, the lock-in amplifier is used for transmitting a high-frequency sine wave signal, and the wavelength of laser transmitted by the QCL laser is modulated after the low-frequency triangular wave signal and the high-frequency sine wave signal are overlapped; the QCL driver is used for driving the QCL laser, the middle infrared detector is used for receiving detection laser signals reflected back through the reflecting surface in the area to be detected, and the data acquisition card is used for processing the reflected detection laser signals.
6. A method for on-line monitoring of greenhouse gas leakage in GIL equipment, comprising:
loading high-frequency cosine modulation current on the driving current of a QCL laser system of each QLAS detection unit in the QLAS detection unit array, and modulating the emitted laser wavelength of the QCL laser system;
for any one QCLASS detection unit in the QCLASS detection unit array, driving a first vibrating mirror of the any one QCLASS detection unit by using a first stepping motor of the any one QCLASS detection unit to enable the first vibrating mirror to rotate, driving a second vibrating mirror of the any one QCLASS detection unit by using a second stepping motor of the any one QCLASS detection unit to enable the second vibrating mirror to rotate, and performing cooperative control on the first stepping motor and the second stepping motor by using an FPGA module of the any one QCLASS detection unit to enable the first vibrating mirror and the second vibrating mirror to keep orthogonal in the rotating process, so that emitted laser of the QCL laser system is reflected to the second vibrating mirror after being reflected by the first vibrating mirror, and then the second vibrating mirror performs 0-180 DEG rotation scanning on a to-be-detected area to which the any one QCLASS detection unit belongs;
measuring temperature data of a region to be detected by using a temperature sensor arranged in the region to be detected, and measuring pressure data of the region to be detected by using a pressure sensor arranged in the region to be detected;
and calculating the greenhouse gas concentration of the to-be-detected area by using a wavelength modulation spectrum method based on the temperature data and the pressure data for any QCLAS detection unit, and alarming a monitoring person when the greenhouse gas concentration exceeds a preset gas concentration so that the monitoring person further determines the to-be-detected area with the greenhouse gas leakage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110248A (en) * | 2023-10-23 | 2023-11-24 | 三峡科技有限责任公司 | System for monitoring leakage of dangerous gas based on ultraviolet light |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117110248A (en) * | 2023-10-23 | 2023-11-24 | 三峡科技有限责任公司 | System for monitoring leakage of dangerous gas based on ultraviolet light |
| CN117110248B (en) * | 2023-10-23 | 2024-02-06 | 三峡科技有限责任公司 | System for monitoring leakage of dangerous gas based on ultraviolet light |
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Inventor after: Qin Yunsong Inventor after: Yang Dezhi Inventor after: Chen Duojie Inventor after: Wang Xiaojia Inventor after: Wang Shuai Inventor before: Wu Peng Inventor before: Yang Dezhi Inventor before: Chen Duojie Inventor before: Wang Xiaojia Inventor before: Lv Qin |