A method and device for measuring SF6 decomposition gas

Abstract

The present invention provides a method and device for measuring SF6 decomposition gas, comprising: S1, measuring H2S, SO2, and CO concentrations in the SF6 decomposition gas using a spectral analysis gas measurement device; S2, correcting the H2S concentration according to the SO2 concentration correction formula to obtain a true H2S concentration; S3, correcting the SO2 concentration according to the H2S concentration correction formula to obtain a true SO2 concentration; and S4, using the CO concentration measurement value as the true CO concentration. The present invention has the beneficial effects of enabling measurement of multiple components using a single device while effectively eliminating interference from interfering components, achieving rapid measurement while ensuring the accuracy of the measurement results.

Description

Technical Field

[0001] The present invention relates to the technical field of SF6 decomposition gas detection, and in particular to a SF6 decomposition gas measurement method and device. Background Art

[0002] SF6 (sulfur hexafluoride)-filled electrical equipment boasts advantages such as compact structure, stable electrical performance, strong arc extinguishing capability, and safe and reliable operation. It is now widely used in ultra-high voltage (UHV) power systems. When SF6-filled electrical equipment experiences a potential malfunction or failure, partial discharge or overheating within the equipment causes the SF6 gas to decompose, generating various decomposition products such as SO2, H2S, CS2, and CO. Qualitative and quantitative analysis of these SF6 decomposition products can be used to identify potential insulation hazards or failures in electrical equipment, which is crucial for ensuring the stable operation of both equipment and the power grid. Therefore, regular testing of SF6 decomposition products to confirm the condition of the SF6 has become a crucial routine task for safe power production. According to State Grid Corporation of China's enterprise standard Q / GDW 1168-2013, "Test Procedures for Condition-Based Maintenance of Transmission and Transformation Equipment," and China Southern Power Grid's "Preventive Testing Procedures for Power Equipment," Q / CSG114002-2011, the primary SF6 decomposition products that require testing include SO2, H2S, and CO.

[0003] Currently, on-site detection of SF6 decomposition gas primarily relies on electrochemical gas sensors, while laboratory testing primarily relies on gas chromatography. The main advantages of electrochemical gas sensors are their fast response speed and high sensitivity, as well as their ability to conduct continuous online testing on-site, enabling rapid fault location and diagnosis. However, electrochemical gas sensors have poor gas selectivity, suffer from cross-interference, have a short lifespan for some sensors, and are susceptible to the effects of ambient temperature and humidity. When measuring the decomposition products of SF6 using the spectral analysis gas measurement device used in gas chromatography, the concentrations of the various decomposition gas products interfere with each other, making quantitative detection difficult and impacting gas detection accuracy. For example, when detecting H2S, the measured SO2 concentration will interfere with the H2S concentration, making H2S concentration detection relatively difficult. Summary of the Invention

[0004] In view of this, in order to solve the problem that when a spectral analysis gas measurement device detects the concentration of SF6 decomposition gas decomposition products, the decomposition product detection accuracy is affected by mutual interference, the embodiment of the present invention provides an SF6 decomposition gas measurement method and device.

[0005] An embodiment of the present invention provides a method for measuring SF6 decomposition gas, comprising the following steps:

[0006] S1. Measure the H2S concentration, SO2 concentration and CO concentration in the SF6 decomposition gas using a spectral analysis gas measuring device;

[0007] S2. Correct the H2S concentration measured value according to the SO2 concentration correction formula to obtain the true H2S concentration value;

[0008] S3. Correcting the SO2 concentration measured value according to the H2S concentration correction formula to obtain the true value of SO2 concentration;

[0009] S4. The measured CO concentration value is taken as the true CO concentration value.

[0010] Furthermore, the correction formula of SO2 concentration to H2S concentration in step S2 and the correction formula of H2S concentration to SO2 concentration in step S3 are obtained according to the following method:

[0011] A1. Inputting standard gases of different concentrations into the spectroscopic analysis gas measurement device in batches, wherein the standard gases include at least one of SO2, H2S, and blank gas, and measuring the concentration values of SO2 and H2S corresponding to the various concentrations of the standard gases;

[0012] A2. Calculate the correction formula of SO2 concentration to H2S concentration based on the actual value of H2S concentration in the standard gas, the measured concentration value of SO2 and the measured concentration value of H2S;

[0013] A3. Calculate the correction formula of H2S concentration to SO2 concentration based on the actual value of SO2 concentration in the standard gas, the measured concentration value of H2S and the measured concentration value of SO2.

[0014] Furthermore, the correction formula for SO2 concentration to H2S concentration in step A2 is CH2S_1=b1*CSO2_0+b2*CH2S_0+b3*CSO2_0*CSO2_0+b4*CSO2_0*CH2S_0+b5*CH2S_0*CH2S_0, wherein CH2S_1 is the concentration correction value of H2S gas, CH2S_0 is the measured concentration value of H2S gas, CSO2_0 is the measured concentration value of SO2 gas, and b1~b5 are the interference coefficients of SO2 concentration to H2S concentration.

[0015] Furthermore, the correction formula of H2S concentration to SO2 concentration in step A3 is CSO2_1=a1*CSO2_0+a2*CH2S_0+a3*CSO2_0*CSO2_0+a4*CSO2_0*CH2S_0+a5*CH2S_0*CH2S_0, where CSO2_1 is the concentration correction value of SO2 gas, CH2S_0 is the measured concentration value of H2S gas, CSO2_0 is the measured concentration value of SO2 gas, and a1~a5 are the interference coefficients of H2S concentration to SO2 concentration.

[0016] Furthermore, the blank gas is nitrogen or an inert gas.

[0017] Furthermore, the types of standard gases introduced in step A1 include blank gas, blank gas+SO2, SO2, blank gas+H2S, H2S, and SO2+H2S.

[0018] Furthermore, the step S1 specifically includes the spectral analysis gas measuring device measuring the H2S concentration value and the SO2 concentration value through the ultraviolet spectral analysis module, and the spectral analysis gas measuring device measuring the CO concentration value through the infrared spectral analysis module.

[0019] Furthermore, before step S1, the following steps are further included:

[0020] Through multiple sampling, multiple SF6 decomposition gas samples are obtained;

[0021] Scanning the plurality of SF6 decomposition gas samples by a traceable device to obtain components in the plurality of SF6 decomposition gas samples and concentration values corresponding to the components;

[0022] According to the components in the plurality of SF6 decomposition gas samples and the concentration values corresponding to the components, an infrared spectrum measurement wavelength and an ultraviolet spectrum measurement wavelength of each component are determined.

[0023] In addition, based on the above-mentioned SF6 decomposition gas measurement method, an embodiment of the present invention further provides an SF6 decomposition gas measurement device, comprising:

[0024] Gas flow channel for conveying SF6 decomposition gas;

[0025] An infrared spectrum analysis module provided on the gas flow channel is used to detect and analyze the SF6 decomposition gas to obtain a CO concentration measurement value;

[0026] An ultraviolet spectrum analysis module provided on the gas flow channel is used to detect and analyze the SF6 decomposition gas to obtain a concentration measurement value of SO2 and a concentration measurement value of H2S;

[0027] and a processor storing a correction formula for H2S concentration to SO2 concentration and a correction formula for H2S concentration to SO2 concentration, wherein the processor is configured to correct a measured concentration value of SO2 gas according to the correction formula for H2S concentration to SO2 concentration, and calculate a corrected concentration value of SO2 gas in SF6 decomposition gas; and to correct a measured concentration value of H2S gas according to the correction formula for SO2 concentration to H2S concentration, and calculate a corrected concentration value of H2S gas in SF6 decomposition gas.

[0028] The beneficial effects brought about by the technical solution provided by the embodiments of the present invention are as follows: a method and device for measuring SF6 decomposition gas of the present invention can effectively eliminate the interference of the SO2 concentration measurement value on the H2S concentration measurement value when detecting SF6 decomposition gas, thereby realizing accurate and rapid measurement of the H2S concentration; in addition, the device detects the SO2 and H2S concentrations by ultraviolet spectral analysis and detects the CO concentration by infrared spectral analysis at the same time. Through one device, it is possible to realize the measurement of multiple components and effectively eliminate the interference of interfering components, thereby realizing rapid measurement and ensuring the accuracy of the measurement results; the device has complete functions and a compact structure, and the entire device is of moderate size, light and easy to carry, and is suitable for on-site and laboratory measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of a method for measuring SF6 decomposition gas according to the present invention;

[0030] Figure 2 This is a diagram showing the verification results of a method for measuring SF6 decomposition gas according to the present invention;

[0031] Figure 3 It is a structural diagram of an SF6 decomposition gas measuring device of the present invention.

[0032] In the figure: 1-infrared spectrum analysis module, 2-ultraviolet spectrum analysis module, 3-circuit board, 4-air zero adjustment port, 5-flow meter, 6-three-way solenoid valve, 7-air pump, 8-pressure relief valve, 9-air inlet, 10-air outlet. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more apparent, embodiments of the present invention will be further described below with reference to the accompanying drawings. The following describes a preferred embodiment of the present invention among multiple possible embodiments, which is intended to provide a basic understanding of the present invention but is not intended to identify the key or decisive elements of the present invention or to limit the scope of protection.

[0034] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0035] Please refer to Figure 1 The embodiment of the present invention provides a SF6 decomposition gas measurement method, which is applied to eliminate the mutual influence of SF6 decomposition gas products when detecting the concentration of SF6 decomposition gas.

[0036] First, the concentration of SF6 decomposition gas is analyzed and studied, and the mutual interference between the components of SF6 decomposition gas is measured to determine whether there is an interference relationship between the components of SF6 decomposition gas, which serves as the basis for subsequent correction of the measured concentration.

[0037] SF6 decomposition gases primarily include SO2, H2S, and CO. Therefore, different concentrations of SO2, H2S, and CO standard gases were fed into the spectral analysis gas measurement device. Each input standard gas had a known concentration, and the measured SO2, H2S, and CO concentrations were observed. The input standard gas concentrations and measurement results are shown in Table 1 below. Table 1 shows that SO2 concentration significantly interferes with H2S concentration, while H2S concentration has less interference with SO2 concentration. There is essentially no interference between CO concentration, H2S concentration, and SO2 concentration.

[0038] Table 1 Comparison of standard gas concentration and measurement results

[0039]

[0040] The interference relationship between SO2 concentration and H2S concentration, and the interference relationship between H2S concentration and SO2 concentration, were then calculated to determine the correction formulas for SO2 concentration to H2S concentration, and H2S concentration to SO2 concentration. This prepared the way for correcting the H2S concentration and SO2 concentration values when subsequently measuring SF6 decomposition gas using a spectral analysis gas measurement device. Specifically, the correction formulas for SO2 concentration to H2S concentration, and H2S concentration to SO2 concentration were obtained using the following method:

[0041] Step A1: Input standard gases of different concentrations into the spectral analysis gas measuring device in batches, wherein the standard gas includes at least one of SO2, H2S and blank gas, and measure the concentration values of SO2 and H2S corresponding to the standard gases of various concentrations. The blank gas is nitrogen or an inert gas and does not absorb the spectrum. The types of standard gases introduced include blank gas, blank gas + SO2, SO2, blank gas + H2S, H2S, and SO2 + H2S. The standard gases specifically introduced in this embodiment are shown in Table 2 below.

[0042] Table 2 Standard gas concentration composition table

[0043] Serial number Standard gas introduced (concentration percentage) 1 <![CDATA[N2]]> 2 <![CDATA[20%SO2+80%N2 <!-- 4 -->]]> 3 <![CDATA[50%SO2+50%N2]]> 4 <![CDATA[80%SO2+20%N2]]> 5 <![CDATA[100%SO2]]> 6 <![CDATA[20%H2S+80%N2]]> 7 <![CDATA[50%H2S+50%N2]]> 8 <![CDATA[80%H2S+20%N2]]> 9 <![CDATA[100%H2S]]> 10 <![CDATA[80%SO2+20%H2S]]> 11 <![CDATA[50%SO2+50%H2S]]> 12 <![CDATA[80%SO2+20%H2S]]>

[0044] Then, using the above 12-point calibration data, we can solve the correction formulas for SO2 concentration to H2S concentration and H2S concentration to SO2 concentration.

[0045] A2. Calculate the correction formula of SO2 concentration to H2S concentration based on the actual value of H2S concentration in the standard gas, the measured concentration value of SO2 and the measured concentration value of H2S.

[0046] A3. Calculate the correction formula of H2S concentration to SO2 concentration based on the actual value of SO2 concentration in the standard gas, the measured value of H2S concentration and the measured value of SO2 concentration.

[0047] For example, in this embodiment, the correction formula of SO2 concentration to H2S concentration is CH2S_1=b1*CSO2_0+b2*CH2S_0+b3*CSO2_0*CSO2_0+b4*CSO2_0*CH2S_0+b5*CH2S_0*CH2S_0, where CH2S_1 is the concentration correction value of H2S gas, CH2S_0 is the measured concentration value of H2S gas, CSO2_0 is the measured concentration value of SO2 gas, and b1~b5 are the interference coefficients of SO2 concentration to H2S concentration, which are calculated from the true values of H2S concentration in multiple sets of standard gases, the measured concentration values of SO2 and the measured concentration values of H2S.

[0048] At the same time, in this embodiment, the correction formula of H2S concentration to SO2 concentration is CSO2_1=a1*CSO2_0+a2*CH2S_0+a3*CSO2_0*CSO2_0+a4*CSO2_0*CH2S_0+a5*CH2S_0*CH2S_0, where CSO2_1 is the concentration correction value of SO2 gas, CH2S_0 is the measured concentration value of H2S gas, CSO2_0 is the measured concentration value of SO2 gas, and a1~a5 are the interference coefficients of H2S concentration to SO2 concentration, which are calculated from the true value of SO2 concentration in multiple sets of standard gases, the measured concentration value of H2S and the measured concentration value of SO2.

[0049] The SF6 decomposition gas is then measured and corrected to obtain accurate concentration data of each component, as follows:

[0050] S1. Inputting SF6 decomposition gas into the spectral analysis gas measuring device, and measuring the H2S concentration value, SO2 concentration value and CO concentration value in the SF6 decomposition gas by the spectral analysis gas measuring device.

[0051] In step S1, the spectral analysis gas measuring device measures the H2S concentration measurement value and the SO2 concentration measurement value through the ultraviolet spectral analysis module, and the spectral analysis gas measuring device measures the CO concentration measurement value through the infrared spectral analysis module.

[0052] Furthermore, before step S1, the wavelength of ultraviolet light used by the ultraviolet spectrum analysis module to measure the gas concentration, and the wavelength of infrared light used by the infrared spectrum analysis module to measure the gas concentration are determined according to the following method:

[0053] Through multiple sampling, multiple SF6 decomposition gas samples are obtained;

[0054] Scanning the plurality of SF6 decomposition gas samples by a traceable device to obtain components in the plurality of SF6 decomposition gas samples and concentration values corresponding to the components;

[0055] According to the components in the plurality of SF6 decomposition gas samples and the concentration values corresponding to the components, an infrared spectrum measurement wavelength and an ultraviolet spectrum measurement wavelength of each component are determined.

[0056] In this way, the most appropriate infrared spectrum measurement wavelength and ultraviolet spectrum measurement wavelength are selected to improve the measurement accuracy of the H2S concentration measurement value, the SO2 concentration measurement value and the CO concentration measurement value, thereby improving the measurement accuracy of the SF6 decomposition gas.

[0057] S2. Correct the H2S concentration measured value according to the SO2 concentration correction formula to obtain the true H2S concentration value;

[0058] S3. Correcting the SO2 concentration measured value according to the H2S concentration correction formula to obtain the true value of SO2 concentration;

[0059] S4. The measured CO concentration value is taken as the true CO concentration value.

[0060] This embodiment also conducts experimental verification on the above SF6 decomposition gas measurement method, specifically verifying the interference correction effect of SO2 on H2S. Specifically, a mixed gas composed of SO2 and H2S is introduced into the spectral analysis gas measurement device at the same time, keeping the concentration of H2S unchanged and constantly changing the concentration of SO2. The test results are as follows: Figure 2 As shown in the figure, line a represents the actual concentration value of SO2 and line b represents the corrected concentration value of H2S. It can be seen from the figure that through the interference correction of the above SF6 decomposition gas measurement method, the interference is controlled within 5PPM, and the interference problem of SO2 on H2S is solved.

[0061] In order to measure the CO concentration, the above-mentioned SF6 decomposition gas measurement method further includes the spectral analysis gas measurement device detecting the CO concentration value in the SF6 decomposition gas through infrared spectral analysis. Since the CO concentration is basically not disturbed during measurement, the CO concentration measurement value is the true concentration value.

[0062] like Figure 3 As shown, based on the above SF6 decomposition gas measurement method, an embodiment of the present invention further provides an SF6 decomposition gas measurement device, including a gas flow channel, an infrared spectrum analysis module 1, an ultraviolet spectrum analysis module 2, a spectrometer 3 and a processor.

[0063] The gas flow channel is a pipeline, specifically a fluororubber tube, and the pipeline is used to receive the SF6 decomposition gas to be measured.

[0064] The infrared spectrum analysis module 1 and the ultraviolet spectrum analysis module 2 are respectively connected in series to the gas flow channel. The infrared spectrum analysis module 1 and the ultraviolet spectrum analysis module 2 are both composed of an air chamber and a spectrometer. The SF6 decomposition gas flows through the air chamber of the infrared spectrum analysis module 1 and the air chamber of the ultraviolet spectrum analysis module 2 in sequence. In this embodiment, the gas flow channel is provided with an air inlet 9, a pressure relief valve 8, a three-way solenoid valve 6, a flow meter 5, an infrared spectrum analysis module 1, an ultraviolet spectrum analysis module 2 and an air outlet 10 connected in sequence. The SF6 decomposition gas flows in from the air inlet 9 and then flows through the infrared spectrum analysis module 1 and the ultraviolet spectrum analysis module 2 in sequence. In addition, the three-way solenoid valve 6 is also connected in sequence to the air pump 7 and the air zeroing port 4 for zeroing the gas flow channel.

[0065] Under the action of infrared light, the gas in the front and rear air chambers of the infrared spectrum analysis module 1 expands. Due to the difference in expansion, a small flow rate is generated between the front and rear air chambers. After the spectrometer 3 detects the flow rate, an AC voltage signal is generated. After signal processing and output to the system, the CO concentration measurement value is obtained. The ultraviolet spectrum analysis module 2 obtains the SO2 concentration measurement value and the H2S concentration measurement value based on the ultraviolet differential absorption spectrum analysis method.

[0066] and a processor, which is a microprocessor and is disposed on the circuit board 3. The processor is connected to the infrared spectrum analysis module 1 and the ultraviolet spectrum analysis module 2, and the processor pre-stores a correction formula for H2S concentration to SO2 concentration, and a correction formula for H2S concentration to SO2 concentration. After obtaining the measured SO2 concentration value and the measured H2S concentration value, the processor is used to correct the measured SO2 gas concentration value according to the correction formula for H2S concentration to SO2 concentration to calculate a corrected SO2 gas concentration value for the SF6 decomposition gas, and to correct the measured H2S gas concentration value according to the correction formula for SO2 concentration to H2S concentration to calculate a corrected H2S gas concentration value in the SF6 decomposition gas. The corrected SO2 gas concentration value and the corrected H2S gas concentration value are the true concentration values of SO2 gas and H2S gas in the SF6 decomposition gas.

[0067] In this document, directional terms such as front, back, top, and bottom are defined based on the positions of components in the accompanying drawings and relative to each other, and are intended for clarity and convenience in describing the technical solution. It should be understood that these terms are relative and may vary depending on usage and placement. The use of these directional terms should not limit the scope of protection claimed in this application.

[0068] In the absence of conflict, the above embodiments and features in the embodiments may be combined with each other.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for measuring SF6 decomposition gas, characterized in that: The following steps are involved: S1. Measure the H2S concentration, SO2 concentration and CO concentration in the SF6 decomposition gas using a spectral analysis gas measuring device; S2. Correct the H2S concentration measured value according to the SO2 concentration correction formula to obtain the true H2S concentration value; S3. Correcting the SO2 concentration measured value according to the H2S concentration correction formula to obtain the true value of SO2 concentration; S4. Taking the measured CO concentration value as the true CO concentration value; The correction formula of SO2 concentration to H2S concentration in step S2 and the correction formula of H2S concentration to SO2 concentration in step S3 are obtained according to the following method: A1. Inputting standard gases of different concentrations into the spectroscopic analysis gas measurement device in batches, wherein the standard gases include at least one of SO2, H2S, and blank gas, and measuring the concentration values of SO2 and H2S corresponding to the various concentrations of the standard gases; A2. Calculate the correction formula for SO2 concentration to H2S concentration based on the true value of H2S concentration in the standard gas, the measured value of SO2 concentration, and the measured value of H2S concentration. The correction formula is: CH2S_1 = b1• CSO2_0 + b2• CH2S_0+ b3• CSO2_0•CSO2_0 +b4• CSO2_0 • CH2S_0+ b5• CH2S_0• CH2S_0, where CH2S_1 is the corrected value of H2S gas concentration, CH2S_0 is the measured value of H2S gas concentration, CSO2_0 is the measured value of SO2 gas concentration, and b1 to b5 are the interference coefficients of SO2 concentration to H2S concentration. A3. Based on the true value of SO2 concentration in the standard gas, the measured value of H2S concentration and the measured value of SO2 concentration, calculate the correction formula of H2S concentration to SO2 concentration. The correction formula is CSO2_1 = a1• CSO2_0 + a2• CH2S_0+ a3• CSO2_0•CSO2_0 +a4• CSO2_0 • CH2S_0+ a5• CH2S_0•CH2S_0, where CSO2_1 is the correction value of SO2 gas concentration, CH2S_0 is the measured value of H2S gas concentration, CSO2_0 is the measured value of SO2 gas concentration, and a1~a5 are the interference coefficients of H2S concentration to SO2 concentration.

2. A method for measuring SF6 decomposition gas according to claim 1, characterized in that: The blank gas is nitrogen or an inert gas.

3. A method for measuring SF6 decomposition gas according to claim 1, characterized in that: The types of standard gases introduced in step A1 include blank gas, blank gas+SO2, SO2, blank gas+H2S, H2S, and SO2+H2S.

4. A method for measuring SF6 decomposition gas according to claim 1, characterized in that: The step S1 specifically includes the spectral analysis gas measuring device measuring the H2S concentration value and the SO2 concentration value through the ultraviolet spectral analysis module, and the spectral analysis gas measuring device measuring the CO concentration value through the infrared spectral analysis module.

5. A method for measuring SF6 decomposition gas according to claim 4, characterized in that: Before step S1, the following steps are also included: Through multiple sampling, multiple SF6 decomposition gas samples are obtained; Scanning the plurality of SF6 decomposition gas samples by a traceable device to obtain components in the plurality of SF6 decomposition gas samples and concentration values corresponding to the components; According to the components in the plurality of SF6 decomposition gas samples and the concentration values corresponding to the components, an infrared spectrum measurement wavelength and an ultraviolet spectrum measurement wavelength of each component are determined.

6. A SF6 decomposition gas measuring device, characterized in that: include: Gas flow channel for conveying SF6 decomposition gas; An infrared spectrum analysis module provided on the gas flow channel is used to detect and analyze the SF6 decomposition gas to obtain a CO concentration measurement value; An ultraviolet spectrum analysis module provided on the gas flow channel is used to detect and analyze the SF6 decomposition gas to obtain a concentration measurement value of SO2 and a concentration measurement value of H2S; and a processor storing a correction formula for H2S concentration to SO2 concentration and a correction formula for H2S concentration to SO2 concentration, wherein the processor is configured to correct the measured concentration value of SO2 gas according to the correction formula for H2S concentration to SO2 concentration, calculate the corrected concentration value of SO2 gas in SF6 decomposition gas, and correct the measured concentration value of H2S gas according to the correction formula for SO2 concentration to H2S concentration, calculate the corrected concentration value of H2S gas in SF6 decomposition gas, wherein the correction formula for SO2 concentration to H2S concentration is CH2S_1 = b1•CSO2_0 + b2•CH2S_0+ b3•CSO2_0•CSO2_0 +b4•CSO2_0 •CH2S_0+ b5•CH2S_0•CH2S_0, wherein CH2S_1 is the corrected concentration value of H2S gas, and CH2S_0 is the measured concentration value of H2S gas. CSO2_0 is the measured concentration value of SO2 gas, b1~b5 are the interference coefficients of SO2 concentration on H2S concentration; the correction formula of H2S concentration to SO2 concentration is CSO2_1 = a1• CSO2_0 + a2• CH2S_0+ a3• CSO2_0• CSO2_0 +a4• CSO2_0 • CH2S_0+ a5• CH2S_0• CH2S_0, where CSO2_1 is the correction value of SO2 gas concentration, CH2S_0 is the measured concentration value of H2S gas, CSO2_0 is the measured concentration value of SO2 gas, a1~a5 are the interference coefficients of H2S concentration on SO2 concentration.

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