Spectral analysis method and device for arc discharge decomposition product of mixed environment-friendly gas

Abstract

The invention discloses a spectral analysis method and device for an arc discharge decomposer of a mixed environment-friendly gas, and the method comprises the steps: injecting the mixed environment-friendly gas into an arc discharge device, and setting discharge parameters; the mixed environment-friendly gas comprises perfluoroisobutyronitrile and carbon dioxide; the discharge parameters at least comprise discharge current and discharge voltage; controlling the arc discharge device to perform arc discharge so as to decompose the mixed environment-friendly gas to generate a decomposer; collecting decomposed products through a gas collecting device, and pretreating the decomposed products; analyzing the preprocessed decomposer through a spectrum instrument to obtain spectrum data; the spectral data at least comprises wavelength, intensity and peak value; acquiring a characteristic spectral line of the decomposer according to the spectral data; determining the type and the measurement concentration of the decomposer according to the standard database and the characteristic spectral line; and checking and correcting the measured concentration of the decomposer. According to the technical scheme provided by the invention, the reliability and the accuracy of decomposition product detection are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mixed environmentally friendly gases, and in particular to a spectrum analysis method and device for arc discharge decomposition products of mixed environmentally friendly gases. Background Art

[0002] C4F7N / C02 mixed environmentally friendly gas is an innovative environmentally friendly gas mixture, mainly composed of perfluoroisobutyronitrile (C4F7N) and carbon dioxide (CO2) mixed in precise scientific proportions. This composite material is particularly valued in the field of electrical engineering because it exhibits excellent insulation performance and dielectric properties, while providing a safer and more reliable working environment in electrical insulation switchgear and substations.

[0003] The arc discharge decomposition products of existing C4F7N / C02 mixed environmentally friendly gas appliances lack suitable spectral analysis methods for decomposition product detection, and the analysis accuracy is poor, which makes it impossible to accurately detect the trace components of the decomposition products, and the reliability and accuracy of the results are poor. Summary of the invention

[0004] The embodiments of the present invention provide a method and device for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases, so as to improve the reliability and accuracy of decomposition product detection.

[0005] In a first aspect, an embodiment of the present invention provides a method for spectral analysis of arc discharge decomposition products of a mixed environmentally friendly gas, comprising:

[0006] Injecting a mixed environmentally friendly gas into an arc discharge device and setting discharge parameters; the mixed environmentally friendly gas includes perfluoroisobutyronitrile and carbon dioxide; the discharge parameters include at least a discharge current and a discharge voltage;

[0007] Controlling the arc discharge device to perform arc discharge so as to decompose the mixed environmentally friendly gas to produce decomposition products;

[0008] collecting the decomposition products through a gas collection device and pre-treating the decomposition products;

[0009] Analyzing the pre-treated decomposed product by a spectrometer to obtain spectral data; the spectral data at least includes wavelength, intensity and peak value;

[0010] Acquire characteristic spectral lines of the decomposition product according to the spectral data; and determine the type and measured concentration of the decomposition product according to a standard database and the characteristic spectral lines;

[0011] The measured concentrations of the decomposition products are calibrated and corrected.

[0012] In a second aspect, an embodiment of the present invention provides a spectral analysis device for arc discharge decomposition products of mixed environmentally friendly gases, which can execute the spectral analysis method for arc discharge decomposition products of mixed environmentally friendly gases provided by any embodiment of the present invention, including: a controller; and a gas injection system, an arc discharge device, a gas collection device and a spectral instrument electrically connected to the controller;

[0013] The controller controls the gas injection system to inject a mixed environmentally friendly gas into the arc discharge device and sets discharge parameters; the mixed environmentally friendly gas includes perfluoroisobutyronitrile and carbon dioxide; the discharge parameters include at least a discharge current and a discharge voltage;

[0014] The controller controls the arc discharge device to perform arc discharge so as to decompose the mixed environmentally friendly gas to produce decomposition products;

[0015] The controller controls the spectrometer to analyze the pre-treated decomposition product to obtain spectral data; the spectral data at least includes wavelength, intensity and peak value;

[0016] The controller obtains the characteristic spectrum line of the decomposition product according to the spectral data; determines the type and measured concentration of the decomposition product according to the standard database and the characteristic spectrum line; and verifies and corrects the measured concentration of the decomposition product.

[0017] In the present invention, first, a mixed environmentally friendly gas of perfluoroisobutyronitrile and carbon dioxide is injected into an arc discharge device for arc discharge, and the decomposition products generated by the decomposition of the mixed environmentally friendly gas are obtained. The discharge parameters of the arc discharge device are set to a suitable range so that the arc is maintained stable. Afterwards, the decomposition products are collected by a gas collection device, and pre-treatment operations such as filtering are performed on the decomposition products, and the decomposition products are analyzed by a spectrometer to obtain spectral data. According to the spectral data, the characteristic spectral lines of the decomposition products can be identified, and the characteristic spectral lines of the decomposition products are compared with the spectral lines in the standard database to determine the type and measured concentration of the decomposition products. The high-energy environment generated by the arc discharge in this embodiment excites the gas molecules and produces rich spectral features, which is conducive to in-depth analysis of the type and concentration of the decomposition products, and by comparing with the standard database, and subsequently verifying and verifying, the reliability and accuracy of the results are improved. In addition, the measured concentration of the decomposition products can be verified and corrected through multiple experiments to further improve the reliability and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic flow chart of a method for spectral analysis of arc discharge decomposition products of a mixed environmentally friendly gas provided by an embodiment of the present invention;

[0019] Figure 2A schematic structural diagram of a spectral analysis device for arc discharge decomposition products of a mixed environmentally friendly gas provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0021] As an environmentally friendly alternative, C4F7N / C02 mixed environmentally friendly gas shows a smaller global greenhouse gas effect, especially compared with traditional insulating gases such as sulfur hexafluoride (SF6), and its potential impact on global warming is greatly reduced. This mixed environmentally friendly gas also has the advantage of being easy to handle because it is gaseous at room temperature and does not require high-pressure storage, making it more economical and efficient in transportation and installation.

[0022] Key application areas for this mixed environmentally friendly gas include ultra-high voltage and high voltage gas insulated switchgear (GIS), gas insulated substation (GIS). In these critical infrastructures, C4F7N / C02 mixed environmentally friendly gas provides efficient insulation performance, reduces harmful gas emissions, and is therefore in line with the global pursuit of more sustainable energy solutions. Its environmentally friendly characteristics also make it a viable option that the electrical industry is actively considering. With the increasing demand for environmental impact assessment and reduction of greenhouse gas emissions, C4F7N / C02 mixed environmentally friendly gas represents a step towards a greener and safer future.

[0023] However, there is a lack of suitable spectral analysis methods for detecting arc discharge decomposition products of existing C4F7N / C02 mixed environmentally friendly gas appliances, and the analysis accuracy is poor, which makes it impossible to accurately detect the trace components of the decomposition products, and the reliability and accuracy of the results are poor. An embodiment of the present invention provides a spectral analysis method for arc discharge decomposition products of C4F7N / C02 mixed environmentally friendly gas. Figure 1 A schematic flow chart of a method for spectral analysis of arc discharge decomposition products of a mixed environmentally friendly gas provided by an embodiment of the present invention, such as Figure 1 As shown, the method of this embodiment includes the following steps:

[0024] Step S101, injecting a mixed environmentally friendly gas into an arc discharge device, and setting discharge parameters; the mixed environmentally friendly gas includes perfluoroisobutyronitrile and carbon dioxide; the discharge parameters include at least a discharge current and a discharge voltage.

[0025] Before performing arc discharge, it is necessary to prepare the sample to be tested of the C4F7N / C02 mixed environmentally friendly gas. Optionally, before injecting the mixed environmentally friendly gas into the arc discharge device, it may also include: detecting the composition parameters and purity parameters of the mixed environmentally friendly gas through a gas analyzer; injecting the mixed environmentally friendly gas into the arc discharge device may include: injecting a set flow of mixed environmentally friendly gas into the arc discharge device through a gas injection system; the gas injection system controls the set flow through a high-pressure gas bottle or a gas flowmeter. When preparing the sample to be tested of the C4F7N / C02 mixed environmentally friendly gas, it is necessary to obtain the composition parameters and purity parameters of the mixed environmentally friendly gas, so as to understand the composition and content of the mixed environmentally friendly gas before decomposition, and to compare it with the decomposition product after decomposition. In this embodiment, the value of the flow rate can be selected according to the experimental requirements, and can be selected according to user needs. This embodiment does not specifically limit this. Furthermore, in order to put the C4F7N / C02 mixed environmentally friendly gas in a better discharge state, the set discharge parameters of the arc discharge device can be set accordingly. For example, the discharge parameters may include a discharge current and a discharge voltage. This embodiment can keep the discharge current and the discharge voltage in a suitable range so that the C4F7N / C02 mixed environmentally friendly gas is in a stable arc and improves the generation effect of decomposition products.

[0026] Step S102: Control the arc discharge device to perform arc discharge to decompose the mixed environmentally friendly gas to produce decomposition products.

[0027] This step is the arc discharge operation. Before the arc discharge operation, you can check whether the cooling system is operating normally, so that after the arc discharge operation is completed, you can collect the decomposition products produced by the decomposition of the mixed environmentally friendly gas and cool the decomposition products through the cooling system. After that, you can set the discharge parameters and start the arc discharge device. Start the gas flow, and generate an arc between the positive and negative electrodes of the arc discharge device by starting the power supply. The current passes through the mixed environmentally friendly gas. The high-energy environment generated by the arc discharge excites and ionizes the mixed environmentally friendly gas molecules, producing rich spectral characteristics. The operator can observe the color and shape of the arc at any time, and adjust various variables such as the discharge parameters and environmental parameters of the arc discharge device at any time, so as to maintain the continuous stability of the arc.

[0028] Step S103: collecting decomposition products through a gas collection device and pre-treating the decomposition products.

[0029] After the mixed environmentally friendly gas decomposes to produce decomposition products, they are collected by a gas collection device for spectral feature detection. It should be noted that before the spectral characteristic detection, the decomposition products need to be pre-treated, for example, cooling, filtering solid particles and impurities, etc., to reduce the interference of factors such as temperature and impurities on the detection of spectral characteristics.

[0030] Step S104: Analyze the pre-treated decomposition product by a spectral instrument to obtain spectral data; the spectral data at least includes wavelength, intensity and peak value.

[0031] In this embodiment, a spectroscopic instrument can also be selected according to the properties of the decomposed product (sample) and the purpose of analysis. Optionally, the spectroscopic instrument includes a plasma emission spectrometer, a mass spectrometer, a photoacoustic spectrometer or a Raman spectrometer. Highly sensitive equipment such as a plasma emission spectrometer and a mass spectrometer can effectively detect trace components of the decomposed product. The high-energy environment generated by the arc discharge excites the gas molecules and produces rich spectral features, which is helpful for in-depth analysis of the type and concentration of the decomposed product. Through multiple experimental verifications and standard comparisons, the reliability and accuracy of the results are improved to ensure that the experimental results are repeatable. In addition, data processing software can be used for baseline correction, noise filtering and spectral line identification to ensure the quality of spectral data.

[0032] Step S105, acquiring characteristic spectral lines of the decomposition products according to the spectral data; and determining the type and measured concentration of the decomposition products according to the standard database and the characteristic spectral lines.

[0033] The spectrum line of the decomposition product, i.e., the characteristic spectrum line, is obtained from the spectrum data. The spectrum data such as the characteristic spectrum line of the characteristic spectrum line is identified and recorded, and the identified characteristic spectrum line is compared with a known spectrum library or standard database to confirm the type of the decomposition product, and the measured concentration of the decomposition product is obtained based on the spectrum data of the standard sample.

[0034] Step S106: Verify and correct the measured concentration of the decomposition product.

[0035] To further improve the accuracy of the measured concentration of the decomposition product, the present embodiment can verify the accuracy and repeatability of the measured concentration, make necessary corrections and adjustments, write an analysis report, and summarize the experimental results and findings. Exemplarily, the measured concentration of the decomposition product in the present embodiment can be measured using different spectrometers to verify the measurement accuracy of the measured concentration of the decomposition product. Alternatively, a standard sample (standard decomposition product) of a known concentration can be measured by the same spectrometer as the measured concentration of the decomposition product in the present embodiment, thereby verifying the measurement accuracy of the measured concentration of the decomposition product.

[0036] In an embodiment of the present invention, a mixed environmentally friendly gas of perfluoroisobutyronitrile and carbon dioxide is first injected into an arc discharge device for arc discharge, and decomposition products generated by the decomposition of the mixed environmentally friendly gas are obtained. The discharge parameters of the arc discharge device are set to a suitable range so that the arc is maintained stable. Afterwards, the decomposition products are collected by a gas collection device, and pre-treatment operations such as filtering are performed on the decomposition products, and the decomposition products are analyzed by a spectrometer to obtain spectral data. According to the spectral data, the characteristic spectral lines of the decomposition products can be identified, and the characteristic spectral lines of the decomposition products are compared with the spectral lines in the standard database to determine the type and measured concentration of the decomposition products. The high-energy environment generated by the arc discharge in this embodiment excites the gas molecules and produces rich spectral features, which is conducive to in-depth analysis of the type and concentration of the decomposition products, and by comparing with the standard database, and then verifying and verifying, the reliability and accuracy of the results are improved. In addition, the measured concentration of the decomposition products can be verified and corrected through multiple experiments to further improve the reliability and accuracy.

[0037] Optionally, before controlling the arc discharge device to perform arc discharge, it may also include: selecting electrodes of corresponding materials according to the mixed environmentally friendly gas and installing them in the arc discharge device; adjusting the mixed environmentally friendly gas to be within a set pressure range, and setting the discharge mode and discharge parameters; the discharge mode includes at least a continuous discharge mode and a pulse discharge mode; controlling the arc discharge device to perform arc discharge may include: starting a discharge power supply to generate an arc between the electrodes so that the discharge current passes through the mixed environmentally friendly gas; monitoring and adjusting the electrode spacing, discharge parameters and environmental parameters so that the arc maintains the same discharge state; the environmental parameters include at least gas flow and temperature; the discharge parameters also include discharge time.

[0038] Before the arc discharge operation, in addition to preparing the sample, the arc discharge device must also be prepared. Specifically, first, check whether the cooling system is operating normally; then, select the electrode material according to the gas characteristics of the mixed environmental gas and the experimental requirements, and install it in the discharge device; monitor the gas pressure of the mixed environmental gas within the set pressure range to avoid excessive or low pressure affecting the discharge effect; set the discharge current, discharge voltage and discharge time according to the experimental design; select continuous discharge mode or pulse discharge mode as needed.

[0039] After the arc discharge device is prepared, the arc discharge device is started and controlled. Specifically, the gas flow is started, and an arc is generated between the electrodes by starting the discharge power supply. The discharge current passes through the mixed environmentally friendly gas, causing the gas molecules to be excited and ionized, and the color and shape of the arc are observed. The electrode spacing or discharge current is fine-tuned as needed, and the discharge current, discharge voltage, gas flow rate and temperature are monitored. The above parameters are adjusted in time to maintain the continuous stability of the arc, and the discharge time is set according to the experimental requirements. This embodiment accurately controls various parameters in the arc discharge, optimizes the discharge effect, improves the analysis accuracy, adjusts the analysis process and equipment according to different experimental requirements, has good flexibility, and detailed step-by-step guidance ensures standardized operation of each link, reduces human errors, and improves the standardization of the experiment. Each experimental link is recorded in detail for subsequent reproduction and data tracing.

[0040] Optionally, collecting decomposition products through a gas collection device may include: detecting that the sealing and cleanliness of the gas collection device meet the experimental threshold; the gas collection device is a condenser, an air bag or a gas sampling bottle; connecting the gas collection device to an arc discharge device, and detecting environmental parameters in the gas collection device; the environmental parameters at least include gas flow, temperature and gas pressure. Collecting decomposition products specifically includes selecting a gas collection device according to experimental requirements, including a condenser, an air bag or a gas sampling bottle, etc., checking the sealing and cleanliness of the gas collection device, connecting the gas collection device to the arc discharge device, using a gas flowmeter to adjust the gas flow, monitoring the environmental parameters of the gas collection device such as gas flow, temperature and gas pressure, and setting the collection time according to the experimental design. In this embodiment, accurate measurement of the environmental parameters of the gas collection device is conducive to improving the accuracy of subsequent spectral detection.

[0041] Optionally, pretreatment of the decomposition product may include: transferring the decomposition product to a sealed gas bottle and cooling it; filtering impurities in the decomposition product through a filter; detecting the filtered decomposition product through a gas analyzer, and recording the marking data of the decomposition product; the marking data at least includes: sample source, pretreatment date and pretreatment data; the pretreatment data at least includes at least one of the following: gas flow rate, filtration time and adsorbent. The pretreatment of the decomposition product specifically includes transferring the decomposition product to a sealed gas bottle. The sample gas temperature is relatively high, and it is cooled using a cooling jacket or condenser. A membrane filter or an activated carbon filter may be used to remove solid particles or impurities in the gas decomposition product. The filtered sample is detected using a gas analyzer, and the treated sample (decomposition product) is clearly marked. The marking data includes the sample source, pretreatment date and pretreatment data. The pretreatment data is various data involved in the pretreatment process of the decomposition product, including gas flow rate, filtration time, and adsorbent used, so as to improve the standardization of the experiment and record each experimental link in detail for subsequent reproduction and data tracing.

[0042] Optionally, pre-treating the decomposition product may also include: diluting the decomposition product to a spectral analysis concentration range by an inert gas according to a dilution ratio; the dilution ratio is obtained according to the detection range and sensitivity of the spectrometer. In addition, before analyzing the pre-treated decomposition product by a spectrometer, some pre-treatment operations need to be performed, for example, using an inert gas to dilute the decomposition product to a suitable spectral analysis concentration range, and calculating the above dilution ratio according to the expected detection range and sensitivity of the spectrometer. This embodiment further improves the accuracy of the spectral feature acquisition process and improves the measurement accuracy of the type and concentration of the final decomposition product.

[0043] Optionally, analyzing the pretreated decomposition product by a spectroscopic instrument to obtain spectral data may include: calibrating the spectral parameters of the spectroscopic instrument by a standard sample of known composition; the spectral parameters include at least the light source intensity, wavelength range and scanning speed; performing spectral measurement on the pretreated decomposition product by a spectroscopic instrument, and recording the spectral data of the decomposition product at different wavelengths; the spectral data includes at least the wavelength, intensity and peak value.

[0044] In the process of spectral analysis, first, a spectral instrument is selected according to the properties of the sample and the purpose of analysis, and the wavelength range (such as ultraviolet, visible, near-infrared bands, etc.) is set according to the analysis requirements, and the sampling frequency, integration time and signal gain of the spectral instrument are set. The spectral instrument may include a plasma emission spectrometer, a mass spectrometer, a photoacoustic spectrometer or a Raman spectrometer. Check the status of the spectral instrument, including the light source, the detector and the optical path, to avoid equipment failure of the spectral instrument. The spectral analysis process is specifically as follows: the spectral instrument is calibrated using a standard sample of known composition, and the spectral parameters such as the light source intensity, the wavelength range and the scanning speed can be calibrated mainly, so that no error occurs due to the above spectral parameters in the subsequent spectral analysis of the decomposition product. After the calibration is completed, the sample to be tested (decomposition product) is spectrally measured. For example, the decomposition product is introduced into a spectral measurement cell or an optical path, and a light source (such as a xenon lamp, a deuterium lamp or a laser) is used to excite the spectral signal of the decomposition product, and the emission spectrum or absorption spectrum of the decomposition product is recorded. The spectral signal of the sample at different wavelengths is recorded, and the spectral data obtained by the measurement is recorded in real time, so as to facilitate the extraction of information such as the type of decomposition product and the measured concentration from the spectral data.

[0045] Optionally, characteristic spectral lines of decomposition products are obtained based on spectral data, including: performing baseline correction on spectral data and eliminating background noise or interference signals; identifying characteristic spectral lines of decomposition products; obtaining the wavelength and intensity of characteristic spectral lines, and the position and intensity of characteristic peaks of characteristic spectral lines; determining the type and measured concentration of decomposition products based on a standard database and characteristic spectral lines, including: comparing the characteristic spectral lines with standard spectral lines in a standard database to determine the type of decomposition products; establishing a standard curve of concentration-spectral intensity based on spectral data of the standard spectral lines; and obtaining the measured concentration of the decomposition products through a linear regression model based on the intensity of the decomposition products and the standard curve.

[0046] In the process of spectral data processing and analysis, the original spectral data obtained by the spectral instrument is first imported into the data processing software to check whether there are missing values ​​or outliers. For example, if the spectral signal is intermittent or the instrument error occurs, some bands may have no signal, resulting in missing values; or, due to interference or equipment failure, some bands may have abnormally high or low spectral intensities, resulting in outliers. After that, the spectral data needs to be baseline corrected to eliminate the influence of background noise or interference signals; the background baseline is deducted by the sliding average method, or the Savitzky-Golay filter is used to reduce noise, the spectral data is normalized, and the data processing software is used to identify the position and intensity of each characteristic peak in the spectrum, and the wavelength and intensity value of each spectral line are recorded. The automatic peak recognition algorithm is used to automatically analyze the spectral data, thereby identifying the characteristic spectral lines, and recording the wavelength and intensity of the characteristic spectral lines, as well as the position and intensity of the characteristic peaks of the characteristic spectral lines. Among them, since the characteristic peaks are spectral characteristics unique to the decomposed products, it is convenient for operators to distinguish and identify the decomposed products according to the characteristic peak machine.

[0047] Baseline correction is a commonly used spectral data processing method, which is mainly used to eliminate the influence of background signals (such as instrument noise, sample environment interference, etc.) on the spectrum, so that the starting point or reference line of the spectral curve is restored to the correct zero point or reference level. This processing method can improve the quality of spectral data and highlight the characteristic signals in the spectrum for further qualitative and quantitative analysis. Exemplarily, if the present embodiment performs baseline correction on the arc discharge decomposition of CO2 and C4F7N mixed gas, under the high-voltage arc discharge environment, the mixed gas of C4F7N and CO2 will produce a variety of decomposition products (such as CO, CF4, etc.), and the spectral data of the decomposition product may be covered by the background radiation of the arc discharge or the instrument noise, and the spectral data of the decomposition product needs to be baseline corrected. The baseline correction step can specifically include: recording the arc background spectral data when there is no decomposition product; recording the spectral data of the decomposition product of the C4F7N / CO2 mixed gas after arc discharge; subtracting the background spectral data from the spectral data of the decomposition product, and retaining the characteristic spectrum of the decomposition product. This embodiment can obtain the wavelength and intensity of the characteristic spectrum, as well as the position and intensity of the characteristic peak of the characteristic spectrum line. For example, the characteristic absorption peaks of CO and CF4 can be successfully identified in the 200-300nm band.

[0048] In the process of reducing high-frequency noise or random signal interference through Savitzky-Golay filtering, a polynomial is used to fit local data to smooth the spectral curve while retaining the shape and position of the peak. Savitzky-Golay filtering is a signal smoothing method based on polynomial fitting. It can retain the peak shape and characteristic position in the signal while reducing noise, and is very suitable for spectral data processing. Specifically, Savitzky-Golay filtering achieves a smoothing effect by fitting a low-order polynomial to the local data points of the signal in a sliding window to replace the original data points. Exemplarily, if the sliding window size is 2m+12m+1 (m is an odd number), 2m+12m+1 continuous data points are selected as a sliding window each time, and the data at the center point of the current window will be replaced by the fitted polynomial value, and then the window slides one data point, and the above steps are repeated until the entire data set is covered. Specifically, within the window, the data points are fitted with a low-order polynomial (such as a 1st or 2nd order polynomial), for example, y=a0+a1x+a2x 2 +…+a k x k ; where a0, a1, ..., a k are polynomial coefficients, and the polynomial system can be estimated by the least squares method, x is the horizontal coordinate value of the spectral curve, and y is the vertical coordinate value of the spectral curve.

[0049] The purpose of normalizing the spectral data is to eliminate the intensity difference between different spectral signals and make the spectral signals comparable at the same scale. Exemplarily, the spectral intensity can be normalized to the range of [0, 1]. After that, the spectral features can be extracted. Specifically, the characteristic peaks are identified and matched with the characteristic spectral lines according to the characteristic peaks. When identifying the characteristic peaks, the automatic peak recognition algorithm in the data processing software is used, and a threshold is set in the automatic peak recognition algorithm to filter the noise peaks, and the peak position (wavelength or wave number) and its corresponding intensity value are recorded to obtain the characteristic spectral lines.

[0050] The process of determining the type of decomposition product according to the standard database and the characteristic spectrum line is specifically as follows: comparing the identified characteristic spectrum line with the standard spectrum line in the known spectrum library or standard database, and considering the spectral resolution, peak offset and intensity change in the comparison process, determining the chemical composition corresponding to the decomposition product of each peak, and thus confirming the type of decomposition product. The process of determining the measured concentration of the decomposition product is specifically as follows: using a standard sample of known concentration (such as a gas mixture with known decomposition product concentration), collecting its spectral data, and recording the intensity values ​​of the main characteristic peaks in the spectrum, establishing the relationship between the concentration and the spectral intensity, and drawing a standard curve. Specifically, this embodiment can use a linear regression model for estimation to quantify the strong correlation between the concentration and the light intensity. For example, the standard curve can be a linear relationship C=kI+b; C is the concentration of the decomposition product; I is the spectral intensity; k and b are the regression coefficients obtained by fitting. Substitute the intensity values ​​of each characteristic peak in the measured spectral data into the standard curve to calculate the concentration of the decomposition product. In the process of spectrum data processing and analysis, this embodiment effectively reduces background noise, improves the accuracy of characteristic peak identification, and enhances the high sensitivity and accuracy of spectrum analysis through baseline correction, filtering and normalization. It also accelerates the identification and concentration calculation of characteristic spectral lines through automated algorithms, which can not only identify the type of decomposition products, but also quantify their concentrations, providing comprehensive decomposition product analysis results with both qualitative and quantitative analysis. This embodiment can effectively identify and quantify the decomposition products of C4F7N / CO2 mixed gas arc discharge through the above process, providing important reference data for the research and application of environmentally friendly gas appliances.

[0051] Optionally, the measured concentration of the decomposition product is verified and corrected, which may include: re-detecting the measured concentration of the decomposition product through different spectroscopic instruments to generate a first verification concentration; if the difference between the first verification concentration and the measured concentration of the decomposition product is greater than a first difference range, the measured concentration of the decomposition product is unqualified; a standard sample of known concentration is passed through a spectroscopic instrument to obtain a second verification concentration; if the difference between the second verification concentration and the known concentration is greater than a second difference range, it is necessary to adjust the spectral parameters of the spectroscopic instrument, and obtain the measured concentration of the decomposition product through the adjusted spectroscopic instrument.

[0052] The operation process of result verification and reporting may specifically include: according to the measured spectral intensity and the standard curve, using a linear regression model to recalculate the measured concentration of the decomposition product, which is referred to as the first verification concentration in this embodiment, or the measured concentration of the decomposition product may be calculated multiple times. It should be noted that each measurement uses a different analysis method or spectral instrument to verify the same sample to be tested (decomposition product), and the consistency of the results is compared. If the difference between the first verification concentration and the measured concentration of the decomposition product is less than or equal to the first difference range, it means that the measurement accuracy of the decomposition product is high. If the difference between the first verification concentration and the measured concentration of the decomposition product is greater than the first difference range, the measured concentration of the decomposition product may have an error, which needs to be verified and corrected again.

[0053] The re-calibration and correction process is as follows: use a standard sample of known concentration to obtain a second calibration concentration through a spectrometer. It should be noted that the spectrometer and the measured concentration of the decomposition product are obtained by the same spectrometer. Verify the accuracy of the measured concentration. According to the verification result, adjust the parameters of the spectral analysis. For example, if the difference between the second calibration concentration and the known concentration is less than or equal to the second difference range, it means that the measured concentration of the decomposition product is accurate. If the difference between the second calibration concentration and the known concentration is greater than the second difference range, it is necessary to adjust the spectral parameters of the spectrometer, and measure and obtain the measured concentration of the decomposition product again through the adjusted spectrometer. The report of this embodiment needs to describe the experimental design, sample processing, analysis method and instrument settings in detail, and compare the similarities and differences with existing literature or standard data. This embodiment promotes the development and application of new environmentally friendly materials through in-depth spectral analysis, provides basic data for research in related fields, reduces resource waste and improves experimental efficiency through effective experimental design and data processing. Problems found during the experiment can promote continuous optimization of experimental processes and equipment configurations to improve overall efficiency and effectiveness.

[0054] In addition, the verification and correction of the measured concentration of the decomposition product may also include: if there is a baseline drift or a systematic error, the baseline drift or the systematic error is corrected again, and the measured concentration of the decomposition product is obtained according to the corrected spectral data. During the execution of the spectral analysis method of arc discharge decomposition products of the entire mixed environmentally friendly gas, any systematic error in any link can be corrected. Moreover, when model data errors occur during data processing and analysis, such as baseline drift, the baseline can also be corrected and the decomposition product can be measured again, thereby improving the measurement accuracy.

[0055] Baseline drift is a common systematic error, usually caused by environmental interference, instrument performance or changes in experimental conditions. The method to correct baseline drift is to use a polynomial to fit the background part (baseline) of the spectrum and subtract the fitted baseline from the original spectrum. For example, select a baseline point without a characteristic peak, fit the baseline with a low-order polynomial (such as first-order or second-order), subtract the fitted baseline, and obtain the corrected spectral signal.

[0056] In addition to baseline drift, other systematic errors may be encountered in spectral analysis, including instrument error, sample error, and environmental error. Among them, instrument errors may be wavelength drift, insufficient spectral resolution, dark current error, etc. Wavelength drift is a situation where the measured wavelength is offset from the actual value due to aging of the grating, spectrometer, or detector of the spectrometer. In this case, it is necessary to use a standard light source (such as a neon lamp or a mercury lamp) to measure the known characteristic peak position and adjust the instrument parameters or perform wavelength correction on the data. The spectral data is offset by using the difference between the actual position and the measured position of the known standard spectrum line. Insufficient spectral resolution is caused by insufficient resolution of the spectrometer, which leads to blurred peak position or peak overlap. It is necessary to increase the instrument sampling resolution and use a deconvolution algorithm to perform peak separation on the spectral data. The dark current error is because the detector still generates a dark current signal when there is no signal input. The correction method is to record the dark current signal before the experiment and subtract it from the spectral signal. Sample error can be sample concentration error or sample cell optical path error. Sample concentration error is the situation where the sample concentration is inaccurate or the sample is uneven, resulting in deviation in the spectral results. The correction method is to use a high-precision balance to accurately prepare the sample concentration and use homogenization technology to ensure uniform distribution of the sample; sample cell optical path error is the inconsistent sample cell thickness (optical path) in the spectral measurement, which affects the absorbance calculation. The correction method is to use a high-precision optical path to calibrate the sample cell and correct the optical path deviation in the calculation. Environmental related errors can be temperature drift, ambient light interference or humidity effects. Temperature drift is the situation where temperature changes cause changes in sample properties (such as absorption peak drift or intensity changes). The correction method is to conduct experiments in a constant temperature environment and record temperature change data for temperature correction; ambient light interference is the situation where stray light in the environment may interfere with spectral measurement. The correction method is to use an optical isolation device or a darkroom to measure and subtract the background light signal from the measurement signal; humidity effect is the situation where humidity may affect the optical properties of the sample or the performance of the instrument. The correction method is to measure the sample under constant humidity conditions and use a desiccant or a closed sample container to reduce the humidity effect. In this embodiment, the general steps of system error correction include: pre-experiment calibration, using standard samples or standard light sources to calibrate the instrument; control during the experiment, strictly controlling the experimental conditions (such as temperature, humidity, light intensity, etc.) to reduce environmental interference; data post-processing, mathematical processing of the measured spectral data (such as baseline correction, normalization, noise filtering); error analysis and verification, comparing the experimental results with theoretical values ​​or reference values, evaluating the source of errors, and adjusting instrument parameters or experimental conditions for compensation. This effectively corrects the baseline drift and other system errors in spectral analysis, thereby improving the accuracy and reliability of spectral analysis.

[0057] In summary, the spectral analysis method of arc discharge decomposition products of C4F7N / C02 mixed environmentally friendly gas in this embodiment uses highly sensitive equipment such as plasma emission spectrometer and mass spectrometer, which can effectively detect the trace components of the decomposition products. The high-energy environment generated by arc discharge excites gas molecules and produces rich spectral characteristics, which is helpful for in-depth analysis of the types and concentrations of decomposition products. Through multiple experimental verifications and standard comparisons, the reliability and accuracy of the results are improved, and the experimental results are repeatable. The data processing software is used for baseline correction, noise filtering and spectral line identification to ensure data quality. In addition, the experimental process is standardized and the records are detailed, which improves the analysis accuracy and result repeatability, and is conducive to the development of new environmentally friendly materials and scientific research.

[0058] Based on the same concept, the embodiment of the present invention also provides a spectral analysis device for arc discharge decomposition products of mixed environmentally friendly gases, such as Figure 2 As shown, Figure 2 A schematic diagram of the structure of a spectroscopic analysis device for arc discharge decomposition products of mixed environmentally friendly gases provided in an embodiment of the present invention. The spectroscopic analysis device for arc discharge decomposition products of mixed environmentally friendly gases comprises: a controller 11; a gas injection system 12, an arc discharge device 13, a gas collection device 14 and a spectrometer 15 electrically connected to the controller 11;

[0059] The controller 11 controls the gas injection system 12 to inject the mixed environmentally friendly gas into the arc discharge device 13 and set the discharge parameters; the mixed environmentally friendly gas includes perfluoroisobutyronitrile and carbon dioxide; the discharge parameters include at least the discharge current and the discharge voltage;

[0060] The controller 11 controls the arc discharge device 13 to perform arc discharge, so as to decompose the mixed environmentally friendly gas to produce decomposition products;

[0061] The controller 11 controls the spectrometer 15 to analyze the pre-treated decomposition product to obtain spectral data; the spectral data at least includes wavelength, intensity and peak value;

[0062] The controller 11 obtains the characteristic spectrum of the decomposition product according to the spectrum data; determines the type and measured concentration of the decomposition product according to the standard database and the characteristic spectrum; and verifies and corrects the measured concentration of the decomposition product.

[0063] In the present invention, first, a mixed environmentally friendly gas of perfluoroisobutyronitrile and carbon dioxide is injected into an arc discharge device for arc discharge, and the decomposition products generated by the decomposition of the mixed environmentally friendly gas are obtained. The discharge parameters of the arc discharge device are set to a suitable range so that the arc is maintained stable. Afterwards, the decomposition products are collected by a gas collection device, and pre-treatment operations such as filtering are performed on the decomposition products, and the decomposition products are analyzed by a spectrometer to obtain spectral data. According to the spectral data, the characteristic spectral lines of the decomposition products can be identified, and the characteristic spectral lines of the decomposition products are compared with the spectral lines in the standard database to determine the type and measured concentration of the decomposition products. The high-energy environment generated by the arc discharge in this embodiment excites the gas molecules and produces rich spectral features, which is conducive to in-depth analysis of the type and concentration of the decomposition products, and by comparing with the standard database, and subsequently verifying and verifying, the reliability and accuracy of the results are improved. In addition, the measured concentration of the decomposition products can be verified and corrected through multiple experiments to further improve the reliability and accuracy.

[0064] Based on the above embodiments, the spectral analysis device for arc discharge decomposition products of mixed environmentally friendly gases provided in this embodiment has the technical characteristics of the spectral analysis method for arc discharge decomposition products of mixed environmentally friendly gases provided in any embodiment of the present invention, and has the beneficial effects of the corresponding characteristics, which will not be repeated here.

[0065] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A spectral analysis method for arc discharge decomposition products of mixed environmentally friendly gases, characterized in that: include: Injecting a mixed environmentally friendly gas into an arc discharge device and setting discharge parameters; the mixed environmentally friendly gas includes perfluoroisobutyronitrile and carbon dioxide; the discharge parameters include at least a discharge current and a discharge voltage; Controlling the arc discharge device to perform arc discharge so as to decompose the mixed environmentally friendly gas to produce decomposition products; collecting the decomposition products through a gas collection device and pre-treating the decomposition products; Analyzing the pre-treated decomposed product by a spectrometer to obtain spectral data; the spectral data at least includes wavelength, intensity and peak value; Acquire characteristic spectral lines of the decomposition product according to the spectral data; and determine the type and measured concentration of the decomposition product according to a standard database and the characteristic spectral lines; The measured concentrations of the decomposition products are calibrated and corrected.

2. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 1, characterized in that: Before the mixed environmentally friendly gas is injected into the arc discharge device, it also includes: Detecting the composition parameters and purity parameters of the mixed environmentally friendly gas by a gas analyzer; Injecting mixed environmentally friendly gas into the arc discharge device includes: The mixed environmentally friendly gas of a set flow rate is injected into the arc discharge device through a gas injection system; the gas injection system controls the set flow rate through a high-pressure gas bottle or a gas flow meter.

3. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 1, characterized in that: Before controlling the arc discharge device to perform arc discharge, the method further includes: Selecting electrodes of corresponding materials according to the mixed environmentally friendly gas and installing them in the arc discharge device; Adjusting the mixed environmentally friendly gas to be within a set pressure range, and setting a discharge mode and the discharge parameters; the discharge mode includes at least a continuous discharge mode and a pulse discharge mode; Controlling the arc discharge device to perform arc discharge, comprising: Starting a discharge power supply to generate an arc between the electrodes so that the discharge current passes through the mixed environmentally friendly gas; The electrode spacing, discharge parameters and environmental parameters are monitored and adjusted to keep the arc in the same discharge state; the environmental parameters include at least gas flow and temperature; the discharge parameters also include discharge time.

4. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 1, characterized in that: The decomposition products are collected by a gas collection device, including: The sealing degree and cleanliness of the gas collection device are tested to meet the experimental threshold; the gas collection device is a condenser, a gas bag or a gas sampling bottle; The gas collection device is connected to the arc discharge device, and the environmental parameters in the gas collection device are detected; the environmental parameters at least include gas flow, temperature and gas pressure.

5. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 1, characterized in that: Pre-treatment of decomposed products, including: transferring the decomposed product to a sealed gas bottle and cooling it; filtering impurities in the decomposed product through a filter; The filtered decomposition products are detected by a gas analyzer, and the marking data of the decomposition products are recorded; the marking data at least includes: sample source, pretreatment date and pretreatment data; the pretreatment data at least includes at least one of the following: gas flow, filtration time and adsorbent.

6. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 5, characterized in that: Pretreatment of the decomposed products also includes: The decomposition product is diluted to a concentration range for spectral analysis by an inert gas according to a dilution ratio; the dilution ratio is obtained according to the detection range and sensitivity of the spectral instrument.

7. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 1, characterized in that: The pre-treated decomposition product is analyzed by a spectral instrument to obtain spectral data, including: Calibrate the spectral parameters of the spectral instrument by using a standard sample of known composition; the spectral parameters at least include light source intensity, wavelength range and scanning speed; The spectrum instrument is used to perform spectrum measurement on the decomposed product after pretreatment, and spectrum data of the decomposed product at different wavelengths are recorded; the spectrum data at least includes wavelength, intensity and peak value.

8. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 1, characterized in that: Acquiring characteristic spectral lines of the decomposition product according to the spectral data includes: Performing baseline correction on the spectral data and eliminating background noise or interfering signals; Identifying the characteristic spectral line of the decomposition product; obtaining the wavelength and intensity of the characteristic spectral line, and the position and intensity of the characteristic peak of the characteristic spectral line; Determining the type and measured concentration of the decomposition product according to the standard database and the characteristic spectrum line includes: Comparing the characteristic spectrum with the standard spectrum in a standard database to determine the type of the decomposition product; According to the spectral data of the standard spectral line, a standard curve of concentration-spectral intensity is established; According to the intensity of the decomposition product and the standard curve, the measured concentration of the decomposition product is obtained through a linear regression model.

9. The method for spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases according to claim 1, characterized in that: The measured concentration of the decomposition product is verified and corrected, including: The measured concentration of the decomposition product is detected again by different spectral instruments to generate a first verification concentration; if the difference between the first verification concentration and the measured concentration of the decomposition product is greater than a first difference range, the measured concentration of the decomposition product is unqualified; A standard sample of known concentration is passed through the spectroscopic instrument to obtain a second calibration concentration; if the difference between the second calibration concentration and the known concentration is greater than a second difference range, the spectral parameters of the spectroscopic instrument need to be adjusted, and the measured concentration of the decomposition product is obtained through the adjusted spectroscopic instrument.

10. A spectral analysis device for arc discharge decomposition products of mixed environmentally friendly gases, characterized in that: A method for performing spectral analysis of arc discharge decomposition products of mixed environmentally friendly gases as described in any one of claims 1 to 9, comprising: a controller; and a gas injection system, an arc discharge device, a gas collection device and a spectral instrument electrically connected to the controller; The controller controls the gas injection system to inject a mixed environmentally friendly gas into the arc discharge device and sets discharge parameters; the mixed environmentally friendly gas includes perfluoroisobutyronitrile and carbon dioxide; the discharge parameters include at least a discharge current and a discharge voltage; The controller controls the arc discharge device to perform arc discharge so as to decompose the mixed environmentally friendly gas to produce decomposition products; The controller controls the spectrometer to analyze the pre-treated decomposition product to obtain spectral data; the spectral data at least includes wavelength, intensity and peak value; The controller obtains the characteristic spectrum line of the decomposition product according to the spectral data; determines the type and measured concentration of the decomposition product according to a standard database and the characteristic spectrum line; and verifies and corrects the measured concentration of the decomposition product.

Images