Correction method and intelligent correction system for influence factors of coal mine light interference type methane measuring device

Abstract

The invention discloses a correction method and an intelligent correction system for influence factors of a coal mine light interference type methane measuring device. The method comprises the following steps: determining that an error exists in the interference type methane measuring device through comparison of detection results; analyzing and eliminating irrelevant factor interference; the coal mine light interference type methane measuring device is calibrated; compounding experimental gas by using an inversion method; the method comprises the following steps: carrying out an experiment of measuring experimental gas by using a light interference type methane measuring device in a laboratory, and analyzing laboratory data to obtain influence factors of measuring errors; and carding and analyzing coal mine site and laboratory data, and correcting the precision of the light interference type methane measuring device. The precision of a mine gas detection instrument can be improved, it is ensured that the methane concentration value of the underground coal mine light interference type methane measuring device is true and reliable, certain safety benefits are created for improving the mine gas safety management level, and the method has high application and popularization value and application prospects for mines with similar problems.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine safety, in particular to a correction method and an intelligent correction system for influencing factors of a coal mine optical interference type methane detector. Background Art

[0002] At present, coal mine gas accidents are still one of the biggest safety hazards in the coal mine production process, and one of the key and difficult points of coal mine safety production. Among them, gas explosion accidents are the most harmful. Gas explosion refers to the thermal-chain oxidation reaction that occurs when gas mixes with air under certain conditions. The instantaneous temperature generated during the explosion can reach 1850-2650℃, and the gas pressure after the explosion is 7-10 times the pressure before the explosion, producing a large amount of harmful gases and greatly reducing oxygen. It has a very strong local destructive ability and may also cause underground coal dust explosions and fires, which can easily develop into a vicious disaster that causes mass casualties, destroys tunnels, damages equipment, and even destroys the entire mine.

[0003] The technical principles used for methane concentration detection in coal mines mainly include: catalytic combustion method, thermal conductivity method, optical interference method, non-dispersive infrared spectroscopy, and tunable semiconductor laser absorption spectroscopy. Due to the main influencing factors of the coal mine environment, such as large coal dust, large temperature difference, large humidity, electromagnetic interference, and complex gas composition, it will have an adverse effect on the measurement accuracy and stability of methane detection technology, resulting in inaccurate or even wrong measurement results. In the coal mine gas inspection, it was found that the CH4 concentration detected by the optical interference methane detector in the goaf and corners of the working surface of some coal mines was inconsistent with the values ​​detected by the portable methane detection alarm and the methane sensor in the safety monitoring system. The results show that the detection results of the optical interference methane detector are generally higher than those of the portable methane detection alarm and the methane sensor, and the deviation is relatively large. Summary of the invention

[0004] In response to the problems existing in the above-mentioned prior art, the present invention proposes a correction method and intelligent correction system for the influencing factors of a coal mine optical interference methane detector, which can improve the accuracy of mine gas detection instruments, create certain safety benefits for improving mine gas safety management, and have strong promotion and application value and application prospects for mines with similar problems.

[0005] like Figure 2 As shown, the present invention discloses a correction method and intelligent correction system for influencing factors of a coal mine optical interference methane detector, comprising:

[0006] S1: Compare the test results of the on-site coal mine optical interferometric methane detector with other methane detection devices to determine the error of the interferometric methane detector;

[0007] S2: Eliminate interference from irrelevant factors based on on-site data analysis;

[0008] S3: Calibrate the optical interferometry methane detector in coal mines;

[0009] S4: Compounding experimental gases in the laboratory using the inversion method;

[0010] S5: Taking the data of methane concentration measured by the on-site optical interferometer methane detector as samples and the actual data on site as standards, an experiment of measuring experimental gas by the optical interferometer methane detector is carried out in the laboratory, and the laboratory data is analyzed to obtain the influencing factors of the measurement error;

[0011] S6: Sort and analyze the coal mine site and laboratory data to correct the accuracy of the optical interferometry methane detector.

[0012] Furthermore, the step S1 includes: comparing the test results of several optical interferometric methane detectors with those of a portable methane detection alarm, a methane sensor, and a gas chromatograph to determine whether errors exist in the interferometric methane detectors.

[0013] Furthermore, the step S2 comprises:

[0014] Judge the accuracy of the chromatograph; judge the impact of changes in environmental parameters such as temperature, humidity, and air pressure; judge the impact of unknown combustible gases on the site on the measurement results.

[0015] Furthermore, the step S3 includes: the calibration of the optical interference methane detector includes accuracy, appearance and interference fringe verification.

[0016] Furthermore, the step S4 comprises:

[0017] S401: Use detection instruments to measure the gas concentration in the goaf and return air corner of the working face, and select specific data;

[0018] S402: Compounding the experimental gas in the laboratory using an inversion method based on the selected specific data.

[0019] Furthermore, in the step S401, the detection instrument includes an optical interference methane detector and a gas chromatograph, and the measurement result of the gas chromatograph is used as the standard result;

[0020] The step S401 specifically includes: numbering a plurality of optical interference methane detectors in sequence, multiple people simultaneously performing detection at the same location and recording the results, and taking a gas sample from the detection location with a balloon to the ground for analysis with a gas chromatograph to select specific data; wherein the detection location includes the goaf area and the return air corner of the coal mining working face; the specific data are the six groups of data with the highest frequency of the goaf area and the return air corner of the working face measured on site;

[0021] Furthermore, in the step S402, the compounding of experimental gas refers to compounding of gas components manually in the laboratory according to the gas analysis results of the gas chromatograph during the on-site measurement, so as to restore the gas components on the coal mine site to the greatest extent.

[0022] Furthermore, in the step S5, the experimental process includes: first, a first round of experiments is carried out while maintaining the original state of the optical interference methane detector, and then a second round of experiments is carried out after the optical interference methane detector is overhauled and reaches the standard error range, and finally a third round of experiments is carried out using a gas chromatograph; the experiments use oxygen, carbon monoxide, carbon dioxide, coal mine on-site compound mixed gas samples and adsorbents as investigation factors, and the specific parameter settings are as follows: 13% to 20% oxygen is prepared based on nitrogen, and one is prepared for every 1%; 0.1% to 0.6% carbon dioxide is prepared based on air, and one is prepared for every 0.1%; 0.04% to 0.09% carbon monoxide is prepared based on air, and one is prepared for every 0.01%; six groups of gas samples with the highest frequency in the goaf and return air corners of the compound working face are prepared; and the adsorbent particle size, drug amount, and drug discoloration loss are configured for each.

[0023] Furthermore, the step S6 includes: performing data fitting on the field detection data and the laboratory measured data to obtain a correction formula for the differentiation of the optical interference methane detector under the differences in environmental gas composition in different regions, and further verifying the field detection data to make its error value within the allowable range; and correcting the accuracy of the optical interference methane detector based on the correction formula.

[0024] The present invention also discloses an intelligent correction system for influencing factors of a coal mine optical interferometry methane detector, characterized in that the system is used to implement the correction method for influencing factors of the coal mine optical interferometry methane detector described above, and the system comprises:

[0025] The comparison module is used to compare the detection results of the on-site coal mine optical interference methane detector with other methane detection devices to determine whether the interference methane detector has errors;

[0026] Interference elimination module, used to: eliminate interference from irrelevant factors based on on-site data analysis;

[0027] Calibration module, used for: calibrating coal mine optical interference methane detector;

[0028] Compounding module, used to: compound experimental gas in the laboratory using the inversion method;

[0029] The influencing factor determination module is used to: take the data of methane concentration measured by the on-site optical interference methane detector as a sample, take the actual data on site as a standard, conduct an experiment of measuring experimental gas by the optical interference methane detector in the laboratory, and analyze the laboratory data to obtain the influencing factors of the measurement error;

[0030] Correction module: Sort and analyze the coal mine site and laboratory data to correct the accuracy of the optical interference methane detector.

[0031] The beneficial effects of the present invention will be described in detail in the specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural principle diagram of the optical interference methane detector disclosed in an embodiment of the present invention.

[0034] Figure 2 It is a flow chart of a method for correcting influencing factors of a coal mine optical interference methane detector disclosed in an embodiment of the present invention.

[0035] Figure 3 It is the regression curve of oxygen and carbon dioxide disclosed in the embodiment of the present invention.

[0036] Figure 4 This is an interface for filling in influencing factors of the optical interference methane detector disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0038] First, this embodiment briefly describes the optical interference type methane detector. Figure 1The optical interference type methane detector shown in the figure comprises a light source 1, a condenser 2, a plane mirror 3, a parallel glass 4, an air chamber 5, a refracting prism 6, a reflecting prism 7, a telescope 8, a methane chamber 9, and an air chamber 10. The optical interference type methane detector emits light from a light source 1, i.e., a light bulb, and the light from the light source 1 is condensed by a condenser 2 to form a parallel light beam. The parallel light beam is directed to the plane mirror 3, and is divided into two beams when passing through the plane mirror 3, one beam passing through the air chamber 10 of the reflecting air chamber 5, and the other beam entering the air sample chamber of the air chamber 5 after refraction. The light beam entering the air chamber 10 changes its propagation path twice after passing through the refracting prism 6, and enters the upper air chamber of the air chamber 5, where it returns to the plane mirror 3, and is directed to the reflecting prism 7 under the action of refraction and reflection of the plane mirror 3, and the reflecting prism 7 reflects the light beam, and the light beam is transferred into the telescope 8. The light beam entering the gas sample chamber is incident in parallel to the refractive prism 6. Under the action of the refractive prism 6, it returns to the gas sample chamber again after 180° reverse rotation. The light beam is directed back to the plane mirror 3, and after reflection by the plane mirror 3, it merges with the light velocity that initially enters the air chamber 10, and enters the telescope 8 together. The two beams of light act together on the focal plane of the objective lens, producing interference, an inherent characteristic of white light. When the air chamber 10 of the gas chamber 5 and the gas sample chamber contain the same gas, the optical path of the two beams of light is the same, and the interference fringes will not move. If the gas in the gas sample chamber changes, the refractive index of the light changes, and the optical path of the two beams of light is different, and the interference fringes will move. According to the movement of the interference fringes, the change in the refractive index of the gas can be known, thereby quantifying the gas concentration.

[0039] The refractive index is an inherent physical property of gas. The optical interference methane detector calculates the concentration of CH4 by the difference between the refractive index of air containing CH4 and the air in the reference gas chamber. If the air composition in the coal mine changes greatly, incorrect readings will be obtained. The gases measured by the optical interference methane detector are mainly N2, O2, CO, CO2, and H2O. The refractive index of CO2 and CH4 is not much different, that is, the measured values ​​output by the same concentration of CO2 and CH4 are approximately the same, so CO2 has a greater impact on the CH4 measurement results. Therefore, in the process of detecting CH4 in coal mines, the gas must first absorb CO2 and H2O through the prepared reagent. However, when the CO2 concentration is too high, the reagent cannot fully absorb CO2, which will cause measurement errors. For places where the CO2 concentration is too high, such as old lanes and goafs, it is necessary to use the optical interference methane detector to detect the CH4 concentration with caution. The refractive index of N2 is not much different from that of air. The increase in N2 concentration does not directly affect the calculation results, but it will cause a decrease in the volume fraction of O2, resulting in a large deviation in the instrument detection results. In addition to the influence of gas, changes in pressure and temperature will also cause changes in the refractive index, thereby causing errors.

[0040] The specific steps of step S1 disclosed in this embodiment are as follows: According to the requirements of the "Coal Mine Safety Regulations", gas inspectors must carry portable optical methane detectors and portable methane detection alarms to conduct gas inspections. The values ​​measured by the optical interferometric methane detector and the portable methane detection alarm, methane sensor, and gas chromatograph in the corner of the A3015 working face, the return air of the A3015 working face, and the goaf of the A3009 transport lane in a certain mine are quite different. The on-site detection results are as follows:

[0041] (1) Instruments and equipment used: 6 optical interferometers for methane determination (hereinafter referred to as optical watts), portable methane detection alarm, methane sensor, and gas chromatograph.

[0042] (2) Measurement locations: upper corner of A3015 working face, return air of A3015 working face, and goaf of A3009 transport lane.

[0043] (3) Measurement period: Continuous on-site testing from March 15 to April 1, 2022.

[0044] (4) Determination method: First, use the No. 1 and No. 2 optical watts to measure and record (when two people are testing, No. 1 and No. 2 optical watts are measured at the same time), and at the same time, use the bladder to take the gas sample at the measurement location and bring it to the ground for chromatographic analysis of the gas sample, record the sampling time and record the readings of the methane sensor and portable methane detection alarm at the test location, as well as the temperature of the location. The optical watts are grouped and compared: No. 1 and No. 2 are grouped together; No. 3 and No. 4 are grouped together; No. 4 and No. 5 are grouped together; No. 5 and No. 6 are grouped together. Compare and collect data for optical watts from different manufacturers and the same manufacturer.

[0045] Before measuring at each test location, the light tile is calibrated to zero in the same horizontal fresh air flow. Each time a sample is taken, the light tile airbag is pressed 7-10 times to take a reading, and the air intake points of different light tiles at the same test location are kept the same as far as possible.

[0046] The test results show that the optical interference methane detector has a large deviation from the test results of the other three instruments, and the methane content detected by the optical interference methane detector is on the high side. The portable methane detection alarm uses the principle of carrier catalytic combustion, the methane sensor of the monitoring system uses the laser principle, and the chromatograph is a chromatographic separation and analysis method that uses gas as the mobile phase. The test principles of these three instruments are different, and the test results are basically the same. It is preliminarily judged that the test results of these three instruments are correct; the test results of the optical interference methane detector are on the high side.

[0047] Table 1 Field measurement data

[0048]

[0049]

[0050] The specific steps of step S2 disclosed in this embodiment are as follows: S2.1 Chromatograph accuracy determination:

[0051] By comparing the working principles and test accuracy of portable methane detection alarms, methane sensors and chromatographic instruments in the field environment, it was determined that the chromatograph had the highest test accuracy in the field environment and was least affected by other factors. First, after the chromatograph was calibrated with a standard gas sample, a chromatograph in a mine was compared with a chromatograph in a coal industry.

[0052] We started to compare and calibrate the chromatographs. We compared the same bag of gas samples from the same sampling point with a chromatograph from a certain mine (called chromatograph No. 1) and a chromatograph from a certain coal industry (called chromatograph No. 2). The results of the two chromatograms showed little difference, indicating that the chromatograph from the certain mine was normal.

[0053] Table 2 Chromatographic instrument comparison data

[0054]

[0055] The oxygen concentration in the goaf of the A3009 transport tunnel in a mine was 0 according to the chromatographic analysis, and the oxygen concentration in the goaf of the A3009 transport tunnel in a coal mine was 1.9195% according to the chromatographic analysis. The reason for the difference in oxygen in the gas sample in the closed wall may be that the experiment interval between the mine and the coal mine was about 5 hours, and the gas would undergo some oxygen changes. To verify this conjecture, after the chromatographic analysis of a mine was completed, the gas bag after the experiment was placed for one day and then the chromatographic analysis was performed again. The results are as follows, and some oxygen changes also occurred. This experiment was repeated for three groups of tests with the same results.

[0056] Table 3 Changes in gas components of a mine chromatographic analysis of gas samples placed in a closed wall for one day

[0057]

[0058]

[0059] Through the above experimental comparison and analysis, the gas analyzed by the chromatograph of a certain mine in the on-site environment is real and accurate, and can be used as a reference condition for the next step of laboratory configuration to simulate the on-site gas composition. It also further proves the accuracy of the test results of the portable methane detection alarm and methane sensor.

[0060] S2.2 The impact of changes in environmental parameters such as temperature, humidity, and air pressure:

[0061] According to the table above and the requirements of the working environment parameters of the three test instruments, different environmental parameters (temperature, humidity, and air pressure) at the test site may affect the measured values ​​of the instrument. By measuring the environmental parameters of the upper corner of the A3015 working surface and the return air of the A3015 working surface in different time periods, the temperature, humidity, and air pressure data are relatively stable, with little fluctuation, and are all within the working environment requirements of each instrument. According to the analysis of the measurement results, the three parameters of environmental factors (temperature, humidity, and air pressure) are in line with the instrument use environment, and the test results of the three instruments at the return air of the A3015 working surface are within the allowable error range. Therefore, the influence of environmental factors on the inconsistent and large differences in the test results of methane sensors, portable methane detection alarms, and optical interference methane detectors can be ruled out.

[0062] S2.3 On-site unknown combustible gas analysis:

[0063] Considering that unknown gases may affect the on-site gas detection data, it is necessary to identify whether there are unknown combustible gases on site. The portable methane detection alarm uses a catalytic combustion reaction. When there is combustible gas in the air, the test result value will increase. In the above table, the portable methane detection alarm has tested the gas in the corner of the A3015 working face, and the test results are all 0. Therefore, there are no other unknown combustible gases under the on-site conditions. For further verification, coal samples were taken on site to the laboratory to analyze the gas components present in the coal body under different conditions.

[0064] Two coal samples were taken from each of the 10m deep hole of the A3015 working face, the 10m deep hole at the upper corner of the A3015 working face, and the 10m deep hole for return air of the A3015 working face, and the samples were sealed and sent back to the National Key Laboratory of Shenyang Institute for experiments.

[0065] The 6 collected coal samples were crushed and sieved in the air in turn into 80 mesh samples, each with 20g of original coal sample, put into sealed bags and numbered 1, 2, 3, 4, 5, 6, and then put into laboratory drying bags. The 6 coal samples were burned separately, and the infrared spectrum analyzed the gas components produced by the combustion of each coal sample. Instruments required for the experiment: Fourier infrared spectrometer, comprehensive thermal analyzer, gas residual content tester, gas chromatograph.

[0066] From the above coal sample analysis results, it can be concluded that there is no unknown combustible gas in the three coal samples of the 10m deep hole of the A3015 working face, the 10m deep hole of the upper corner of the A3015 working face, and the 10m deep hole of the return air of the A3015 working face. Combined with the test results of the on-site portable methane detection alarm at the upper corner of the A3015 working face, the influence of unknown combustible gas on the measurement results is ruled out.

[0067] The specific steps of step S3 disclosed in this embodiment are as follows:

[0068] According to the "Optical Interference Methane Determination Instrument" (MT 28-2005), the calibration of the optical interference methane determination instrument adopts the pressure method. According to its working principle, when there is no methane in the measured environment, the methane chamber and the air chamber of the methane determination instrument are filled with air, with the same refractive index and optical path, and the interference fringes in the instrument do not move. When there is methane in the measured environment, the gas composition of the methane chamber changes, the refractive index changes, the optical path of the methane chamber also changes, and the interference fringes move. The movement of the interference fringes is proportional to the volume fraction of methane. By measuring this movement, the volume fraction of methane in the air can be measured. When the methane chamber and the air chamber are both filled with air, when the pressure of the methane chamber is changed, the gas refractive index and optical path of the methane chamber will also change, and the interference fringes will also move. The movement of the interference fringes is proportional to the pressure applied to the methane chamber. Under certain temperature conditions, the corresponding relationship between the methane volume fraction and pressure that causes the same amount of interference fringes movement is:

[0069]

[0070] In the formula: X is the methane volume fraction corresponding to the pressure P, %; P is the methane volume fraction corresponding to the measuring device at ambient temperature, Pa; t is the ambient temperature, °C.

[0071] When calibrating the instrument, use a standard pressure gauge to measure the pressure applied to the methane chamber of the measuring device, and convert the corresponding standard methane volume fraction using the above formula to compare with the reading of the instrument being tested.

[0072] The laboratory inspected and tested the appearance and interference fringes of 6 different types of optical interference methane detectors, and the test results are shown in Table 4. The test results basically ruled out the influence of the quality of the drug selection and absorption efficiency on the measurement difference. Therefore, it can be ruled out that the error caused by the quality problem of the instrument itself during the measurement of methane concentration.

[0073] Table 4 Appearance and interference fringe test results of optical interferometric methane detector

[0074]

[0075] Step S4 disclosed in this embodiment is specifically as follows:

[0076] S4.1 Inversion of field measured data:

[0077] Through on-site measurement and recording of the upper corner of the goaf, we found out the six groups of data with the highest frequency, including (N2=90%, CO2=9.3%), (N2=92%, CO2=7.9%), O2=18% and O2=17% in the upper corner. The gas composition of these two points was analyzed by a chromatograph of a mine. By distributing the gas according to the components analyzed by the chromatographic analysis (due to the limitation of the distribution conditions, only similar gas samples can be prepared and 100% consistency cannot be achieved), we can reproduce the on-site light watt measurement data.

[0078] Six kinds of mixed gases were prepared according to the A3009 transport tunnel goaf and the corner of the A3015 working surface to simulate the on-site gas environment. The first round of experiments was carried out with the original state of the light tiles, and then the second round of experiments was carried out after maintenance and reaching the standard error range.

[0079] Table 5 selects the following real combination mixed gas

[0080]

[0081] Table 6 Laboratory simulation data of A3009 transport lane goaf

[0082]

[0083]

[0084] Table 7 Laboratory simulation of A3015 working surface corner data

[0085]

[0086] Table 8 Laboratory test data statistical results

[0087]

[0088]

[0089] From the data results in the comprehensive table, it can be seen that the average error between the measurement results of 6 different models of optical interference methane detectors and the true value exceeds the allowable range, indicating that there is a large error in the gas measurement results of the optical interference methane detector in a certain mine.

[0090] S4.2 Measurement result trend:

[0091] In the laboratory at about 25℃, standard gas is used to simulate the on-site gas environment. The trend of methane measurement values ​​is: the original state of the coal mine site light watts > the original state of the laboratory light watts ≈ the state of the laboratory light watts after maintenance; the trend of the coal mine site measurement results is similar to the measurement results in the laboratory, and the measurement values ​​are slightly different. The maximum value of the theoretical value range of the light watts in the closed wall of the goaf of the A3009 transport tunnel is the theoretical influence value of oxygen plus the theoretical influence value of carbon dioxide (the maximum value assumes that the absorption rate of carbon dioxide by the adsorbent is 0, and the actual absorption rate is determined by factors such as the agent and carbon dioxide concentration).

[0092] In the absence of carbon dioxide adsorbents, the experiment of "comparison of simulated on-site gas environment measurement values ​​with actual on-site measurement values ​​in coal mines" was repeated, and the measured values ​​were all larger than those with carbon dioxide adsorbents, indicating that carbon dioxide gas has an impact on the measurement values ​​of light watts.

[0093] The specific steps of step S5 disclosed in this embodiment are as follows:

[0094] This embodiment uses the data of methane concentration measured by an optical interference methane detector in the goaf and upper corner of a mine as samples, and the methane concentration data measured by a gas chromatograph as the standard, and statistically summarizes the data obtained by measuring the methane concentration by the laboratory optical interference methane detector, analyzes the factors affecting the measurement error of the detector by different gas types and different oxygen concentrations, and obtains corresponding conclusions.

[0095] S5.1 Analysis of the influence of oxygen concentration on the measurement results of optical interference methane detector

[0096] The laboratory is equipped with standard gases with different oxygen concentration conditions, and the optical interferometer methane detector is used to detect the methane concentration of the standard gas. The laboratory measured data is statistically analyzed to obtain the influence of oxygen concentration changes on the measurement error of the optical interferometer methane detector.

[0097] First, the first round of experiments was carried out while keeping the light tiles in their original state, and then the second round of experiments was carried out after they were overhauled and within the standard error range.

[0098] Table 9: Nitrogen as base gas with 13%-20% oxygen, each 1% with one

[0099]

[0100]

[0101]

[0102] As shown in the above table, in a laboratory environment at about 25°C, when the oxygen concentration is in the range of 13% to 20%, for every 1% decrease in the oxygen value, the measured value of the optical interference methane detector increases by 0.18% to 0.20% (but there is no methane in reality), and the values ​​detected by the methane detector are all greater than the actual values.

[0103] According to the gas composition analyzed by the chromatograph of a certain mine, the oxygen and carbon concentration in the corner of the A3015 working surface is in the range of 13% to 20%. The laboratory uses nitrogen as the base to prepare 13% to 20% oxygen, and prepares one type for every 1%; simulating the influence of single gas oxygen in the upper corner of a certain mine, the results show that single gas oxygen (regardless of the presence or absence of adsorption agent) will have a greater impact on the measurement results of the optical interference methane detector. As the oxygen concentration decreases, the measurement value error increases, and the higher the oxygen concentration, the smaller the error.

[0104] Take the No. 1 optical watt as an example, and take the data with absorbent after maintenance. When the oxygen concentration changes from 13.1% to 19.83%, the values ​​detected by the optical interference methane detector are all greater than the actual values. The difference between the average value of methane measured by the detector and the methane value in the actual gas varies between 0.26% and 1.5%. The overall trend is that the higher the oxygen concentration, the smaller the difference.

[0105] Table 10 Error analysis of methane concentration measured by optical interference methane detector in different oxygen concentration atmospheres

[0106]

[0107]

[0108] Table 11 Trend of mean methane concentration and oxygen concentration measured by optical interference methane detector

[0109]

[0110] S5.2 Analysis of the influence of CO2 concentration on the measurement results of the optical interference methane detector:

[0111] With air as the base, add 0.1% to 0.6% carbon dioxide, and add one type for every 0.1%; 6% to 9% carbon dioxide, and add one type for every 1%; and add 1% and 1.5% carbon dioxide. The following table is a statistical analysis of the data of No. 1 light watt.

[0112] Under the same concentration, when the CO2 concentration changes from 0.1% to 9%, in the presence of a respirator, the error range between the methane value measured by the methane detector and the actual value is not large.

[0113]

[0114]

[0115]

[0116]

[0117]

[0118]

[0119]

[0120]

[0121] As shown in Tables 12 to 14 above, under a laboratory environment of about 25°C, when the carbon dioxide concentration is in the range of 0.1% to 1.0%, the measured value with the adsorbent is 0.10% to 0.15%; when the carbon dioxide concentration is in the range of 1.5% to 7.0%, the measured value with the adsorbent is 0.15% to 0.20%; when the carbon dioxide concentration is 7.99%, the measured value with the adsorbent is 0.3% to 0.4%; when the carbon dioxide concentration is 8.95%, the measured value with the adsorbent is 0.6% to 0.7%; the carbon dioxide adsorbent has an obvious adsorption effect, which gradually deteriorates with the increase of concentration.

[0122] According to the gas composition analyzed by a chromatograph of a certain mine, the carbon dioxide concentration in the corner of the A3015 working face is in the range of 0.1% to 0.6%. The laboratory uses air as the base to mix 0.1% to 0.6% carbon dioxide, and mixes one type for every 0.1%; the carbon dioxide concentration in the goaf of the A3009 transport lane is in the range of 6% to 9%. The laboratory uses air as the base to mix 6% to 9% carbon dioxide, and mixes one type for every 1%; the impact of single gas carbon dioxide in the upper corner and goaf on site is simulated.

[0123] The results show that when considering a single gas, especially carbon dioxide, even in the presence of an adsorbent, it still has a significant impact on the measurement results of the optical interferometer methane detector. As the concentration of carbon dioxide increases, this effect gradually increases, resulting in a continuous increase in measurement errors.

[0124] S5.3 Analysis of the influence of CO concentration on the measurement results of the optical interference methane detector:

[0125] Carbon monoxide (0.049989%) and carbon monoxide (0.09854%), with or without adsorbent, have no effect on the measured values ​​of the optical watt. According to the experimental results, see Table 15 for analysis, carbon monoxide has little effect on the measurement results of the optical interference methane detector and can be ignored.

[0126] Table 15 Error analysis of methane concentration measured by optical interference methane detector in different CO concentration atmospheres

[0127]

[0128]

[0129] S5.4 Analysis of the influence of adsorbent on the measurement results of optical interference methane detector:

[0130] During on-site testing, whether or not to bring an adsorbent has a significant impact on the test results. The specific results are shown in the following table.

[0131] Table 16 Effect of adsorbent on test results during field testing

[0132]

[0133] In order to study the specific effects of adsorbents, the next detailed test was conducted in a laboratory environment. (1) The effect of adsorbent particle size on the light watt measurement value:

[0134] Simulating the gas environment of the A3009 transport tunnel goaf on March 15 and March 30, the values ​​of carbon dioxide (0.601%, 1.49%, 5.99%, 7.99%) were measured at different drug dosages in the state of single-tube small-particle adsorption and single-tube large-particle adsorption. Small particles: length 9-11mm, diameter 3.2-3.3mm, large particles: length 7-10mm, diameter 5.2-5.3mm.

[0135] Table 17 Comparison of small particle adsorption agent and large particle adsorption agent

[0136]

[0137] The effect of absorbing carbon dioxide by a single-tube small-particle adsorbent is better than that by a single-tube large-particle adsorbent. The large-particle adsorbent is the adsorbent used at a certain mine site. It is recommended to replace it with a small-particle adsorbent, which is also one of the factors affecting the measurement results of the optical interference methane detector.

[0138] (2) The influence of the amount of adsorbed drug on the light watt measurement value:

[0139] In a simulated gas environment, Guangwa measured the values ​​of the drugs at different dosages in single-tube adsorbent, two-tube adsorbent and three-tube adsorbent soda-lime states.

[0140] Table 18 Effect of adsorption drug dosage on measured values

[0141]

[0142]

[0143] The effect of adsorbing carbon dioxide does not change significantly after the amount of adsorbent increases. Only when the carbon dioxide concentration reaches 7.99%, there is some effect. Therefore, in the daily work on the coal mine site, there is no need to increase the amount of adsorbent.

[0144] (3) The influence of discoloration loss of adsorbed chemicals on the measured value of light watts

[0145] The gas environment in the goaf of A3009 transport tunnel on March 15 and March 30 was simulated, and the values ​​were measured under the normal state and the color change and loss state of single-tube small particle adsorption medicine.

[0146] Table 19 The influence of discoloration loss of adsorbed chemicals on the measured value of light watts

[0147] Simulated location Single tube small particle adsorption drug normal state Single tube small particle adsorption drug discoloration loss state Gas environment in the goaf of A3009 transport lane on March 15 3.90％～4.28％ 6.00％～6.64％ Gas environment in the goaf of A3009 transport lane on March 30 3.92％～4.24％ 4.74％～5.41％

[0148] The discoloration and loss of the adsorbed chemical will have a great impact on the measured value of the optical watt. After the adsorbed chemical changes color and is lost, the chemical should be replaced in time to avoid affecting the measurement results of the optical interference methane detector.

[0149] In summary, the main factors that cause errors in the measurement results of the optical interferometer methane detector are the changes in the CO2 and O2 concentrations in the gas components at the measuring point and the adsorbent. Among them, the main controlling factors are different in different locations. In the corner oxygen concentration of the A3015 working surface, the main controlling factor affecting the measurement accuracy of the optical interferometer methane detector is the oxygen concentration. In the goaf of the A3009 transport tunnel, the combined factor of oxygen and carbon dioxide concentration is the main controlling factor affecting the measurement accuracy of the optical interferometer methane detector.

[0150] S5.5 Summary

[0151] This embodiment discloses the results of analyzing the gas composition using a chromatograph collected on-site at a certain mine. In the laboratory simulation of the gas composition verification in the A3009 transport lane goaf and the A3015 working surface corner, the coal mine on-site measurement results are similar to the laboratory measurement results, and the measured values ​​are slightly different. In the laboratory single gas impact experiment, it conforms to the theoretical change trend and law of oxygen and carbon dioxide concentrations. Analysis of the experimental data of a certain mine shows that the main influencing factors of the optical interference methane detector are: the accuracy and adjustment error of the optical watt itself, gas concentration, and absorbent consumables.

[0152] (1) The accuracy and calibration error of the optical watt: Generally, optical watts are calibrated to within the national standard and industry standard error range before leaving the factory. However, due to factors such as transportation and use, the basic error of the instrument will increase beyond the normal usable range. The maximum error of the No. 4 optical watt used in the test is 1%, which is much larger than the standard requirement.

[0153] (2) Influence of oxygen: The influence of single gas oxygen in the upper corner of the field was simulated. The results showed that single gas oxygen (regardless of the presence or absence of adsorbent) would affect the measurement results of the optical interferometer methane detector. As the oxygen concentration decreased, the measured value increased. For every 1% decrease in the oxygen value, the measured value of the optical watt increased by 0.18% to 0.20%. Among them, the oxygen concentration in the underground gas composition is the main controlling factor affecting the test accuracy of the optical interferometer methane detector.

[0154] (3) Impact of carbon dioxide: The impact of single gas carbon dioxide in the upper corner and goaf of the site was simulated. The results showed that single gas carbon dioxide, even in the presence of adsorbents, would affect the measurement results of the optical interferometer methane detector. As the carbon dioxide concentration increased, the impact gradually expanded, resulting in a continuous increase in measurement errors.

[0155] (4) Influence of absorbent: The effect of a single-tube small-particle absorbent on absorbing carbon dioxide is better than that of a single-tube large-particle absorbent. Large-particle absorbent is used at a mine site. It is recommended to replace it with a small-particle absorbent. The discoloration and loss of the absorbent will have a great impact on the measured value of the optical watt. After the discoloration and loss of the absorbent, the absorbent should be replaced in time to avoid affecting the measurement results of the optical interference methane detector.

[0156] The specific steps of S6 disclosed in this embodiment are as follows:

[0157] Through detailed sorting and analysis of coal mine site and laboratory data, the changing trend curves of oxygen and carbon dioxide gas concentrations were systematically studied; combined with adsorption agents and specific factors of the coal mine site, this project successfully developed intelligent correction management software for optical interferometric methane detectors to accurately correct the measurement results of the interferometric methane detector.

[0158] like Figure 3 and Figure 4 As shown in the figure, the developed software was used to accurately fit the field test data and laboratory measurement data. Through this process, the correction formula for the methane concentration of the optical interference methane detector was obtained. Subsequently, the relevant gas parameters measured at a mine site were imported into the correction formula for verification. After calculation and verification, the methane concentration calculated by the correction formula is close to the actual methane concentration value at the mine site, and the error value is within an acceptable range.

[0159] Therefore, after correction, the optical interferometry methane detector of a certain mine can basically meet the requirements of underground gas inspection and provide reliable technical support for mine safety monitoring.

[0160] The intelligent correction management software for the optical interference type methane detector has passed comprehensive tests on laboratory simulation data and coal mine site data. This software has the function of correcting the measurement results of the optical interference type methane detector. The correction process involves detailed correction coefficient formulas and verification processes, which will be described in detail below.

[0161] S6.1 Correction coefficient and true value calculation:

[0162] According to the results analyzed above, the main factor affecting the error of the optical interference type methane detector when detecting methane concentration at a certain coal mine site is caused by the change of oxygen concentration, and the change of CO2 concentration and adsorbent also affect the detection of methane concentration by the optical interference type methane detector; therefore, in combination with the actual situation on site, when calculating the correction coefficient, the O2 and CO2 concentrations are used as independent variables, considering the presence or absence of adsorbent, and the correction coefficient is used as the dependent variable. The software is used to perform data fitting on the data measured in the laboratory to obtain the correction formula for the influencing factors of the methane concentration of the optical interference type methane detector.

[0163] The curve fitting method is often used in the fields of scientific research and engineering technology to process experimental and detection data and determine the relationship between variables. Based on the least square theory and the L-M algorithm, the field detection data is non-linearly fitted through an exponential function model.

[0164] Since the gas components in the gob area of the A3009 haulage roadway and the upper corner of the A3015 working face at the site are completely different and the influencing factors are also different, different correction formulas are calculated for these two areas.

[0165] Correction formula for the gob area of the haulage roadway: In the case of having an adsorbent, the correction formula:

[0166] Y = 丨C - 0.1797a + 0.1896b 2 - 3.3364b + 9.2079丨

[0167] In the formula: Y—the corrected reading value, %; a—the O2 concentration, %; b—the CO2 concentration, %; C—the methane concentration measured by the optical interference type methane detector, %.

[0168] Correction formula for the upper corner of the working face:

[0169] Y = 丨C + 0.1797a - 3.744丨

[0170] In the formula: Y—the corrected reading value, %; a—the O2 concentration, %; C—the methane concentration measured by the optical interference type methane detector, %.

[0171] S6.2 Verification of the correction coefficient in the on-site values:

[0172] Numerical verification of the transport tunnel goaf area: Substitute the correction formula obtained from the transport tunnel goaf area into the on-site test data for verification. The corrected methane mean value is compared with the on-site chromatographic test value, and the error is significantly reduced after correction. See the table below for details.

[0173] Table 20 Numerical verification in the goaf of the transport tunnel

[0174]

[0175] By comparing the methane values ​​obtained by the corrected optical interferometer with the on-site chromatographic detection data, it is found that the error difference between the corrected values ​​and the actual data is between 0.0048% and 1.2593%. Correspondingly, the error difference between the methane values ​​obtained by the uncorrected optical interferometer and the on-site chromatographic detection values ​​is between 4.4392% and 6.1925%.

[0176] It can be seen that the application effect of the corrected optical interferometer methane detector in the goaf of the transport lane is good. The correction formula basically conforms to the actual situation on site, and the corrected optical interferometer methane detector value can basically meet the prediction and monitoring management needs of the site. This means that the corrected measurement results can be used to guide the safety production monitoring work on site and provide reliable support for actual operations. This study provides strong technical support for improving the practicality and accuracy of the optical interferometer methane detector, which is of great significance to coal mine gas monitoring.

[0177] Numerical verification of the upper corner of the working surface: Substitute the correction formula obtained from the upper corner of the working surface into the on-site test data for verification. The corrected methane mean value is compared with the on-site chromatographic test value, and the error is significantly reduced after correction. See the table below for details.

[0178] Table 21 Numerical verification of corner angles on the working surface

[0179]

[0180] By comparing the methane values ​​measured by the corrected optical interferometer with the on-site chromatographic detection data, it is found that the error difference between the corrected values ​​and the actual data is between 0.0142% and 0.2302%. In contrast, the error difference between the methane values ​​measured by the uncorrected optical interferometer and the on-site chromatographic detection values ​​is between 0.2% and 1.1399%.

[0181] Therefore, the correction formula of the upper corner of the working surface basically conforms to the actual situation on site. The corrected optical interference methane detector value can basically meet the prediction and monitoring management needs of the site, and can be used to guide the safety production monitoring work on site.

[0182] Based on the above steps, this embodiment draws the following conclusions:

[0183] According to the results of gas composition analysis using a chromatograph collected on site at a certain mine, in the verification of gas composition in the A3009 transport tunnel goaf and the A3015 working face corner in the laboratory simulation site, the coal mine on-site measurement results are similar to the laboratory measurement results, and the measurement values ​​are slightly different. In the laboratory single gas impact experiment, it conforms to the theoretical change trend and law of oxygen and carbon dioxide concentrations. Analysis of the experimental data of a certain mine shows that the main influencing factors of the optical interference methane detector are: the accuracy and adjustment error of the optical watt itself, gas concentration, and absorbent consumables. And based on the influencing factors and correction coefficient formula, the intelligent correction management software of the optical interference methane detector was developed.

[0184] (1) The accuracy and calibration error of the optical watt: Generally, optical watts are calibrated to within the national standard and industry standard error range before leaving the factory. However, due to factors such as transportation and use, the basic error of the instrument will increase beyond the normal usable range. The maximum error of the No. 4 optical watt used in the test is 1%, which is much larger than the standard requirement.

[0185] (2) Influence of oxygen: The influence of single gas oxygen in the upper corner of the scene was simulated. The results showed that single gas oxygen (regardless of the presence or absence of adsorbent) would affect the measurement results of the optical interference methane detector. As the oxygen concentration decreased, the measured value increased. For every 1% decrease in oxygen value, the measured value of the optical watt increased by 0.18% to 0.2%.

[0186] (3) Impact of carbon dioxide: The impact of single gas carbon dioxide in the upper corner and goaf of the site was simulated. The results showed that single gas carbon dioxide, even in the presence of adsorbents, would affect the measurement results of the optical interferometer methane detector. As the carbon dioxide concentration increased, the impact gradually expanded.

[0187] (4) Influence of composite gas: The laboratory simulated the mixed gas composition in the upper corner and goaf of the site, and reversed the influence trend of the on-site gas changes. The analysis showed that the main controlling factors in different locations were different. In the corner of the A3015 working face, the oxygen concentration was the main controlling factor affecting the measurement accuracy of the optical interferometer methane detector. In the goaf of the A3009 transport tunnel, the composite factor of oxygen and carbon dioxide concentration was the main controlling factor affecting the measurement accuracy of the optical interferometer methane detector.

[0188] (5) Influence of adsorbents: The effect of a single-tube small-particle adsorbent on absorbing carbon dioxide is better than that of a single-tube large-particle adsorbent. Large-particle adsorbents are used on site at a mine, and it is recommended to use smaller-particle adsorbents. The discoloration and loss of adsorbents have a great impact on the measured value of the optical watt. It is recommended that if the discoloration and loss of adsorbents are found on site, the drugs should be replaced in time to avoid affecting the measurement results of the optical interference methane detector.

[0189] (6) Based on the on-site measurement data, a correction coefficient formula applicable to the determination of methane concentration by the optical interference type methane detector in coal mines is obtained. Since the gas components in the goaf of the A3009 haulage roadway and the upper corner of the A3015 working face on-site are completely different and the influencing factors are also different, different correction formulas are calculated for these two areas. In the case of having adsorbents in the goaf of the haulage roadway, the correction formula is:

[0190] Y = |C - 0.1797a + 0.1896b 2 - 3.3364b + 9.2079|

[0191] The correction formula for the upper corner of the working face:

[0192] Y = |C + 0.1797a - 3.744|

[0193] In the formula: Y—the corrected reading value, %; a—the O2 concentration, %; b—the CO2 concentration, %; C—the methane concentration measured by the interference type methane detector, %.

[0194] The result of comparing the methane concentration measured by the optical interference type methane detector in coal mines after correction with the on-site chromatographic detection data shows that in the goaf of the haulage roadway, the error difference range between the corrected measured value and the actual chromatographic detection data is between 0.0048% and 1.2593%. And in the upper corner of the working face, the error difference range between the corrected measured value and the actual data is between 0.0142% and 0.2302%.

[0195] This indicates that the intelligent correction management software of the optical interference type methane detector shows good precision and accuracy in the gas inspection work in coal mines. The corrected measurement results can meet the needs of underground gas inspection and provide reliable technical support for ensuring the safe production of the mine.

[0196] The present invention has the following beneficial effects:

[0197] Technical benefits: By introducing an intelligent correction system, the successful application of multiple technological innovation points has been realized, including improving the accuracy of the optical methane detector itself, correcting the measured values of oxygen and carbon dioxide, accurately analyzing the composite gas environment, optimizing the selection of adsorption agents, developing intelligent correction software, etc. These technological innovations together improve the accuracy and stability of the optical interference type methane detector in the complex coal mine underground environment, laying a solid foundation for achieving more reliable methane concentration detection.

[0198] Economic benefits: The introduction of the intelligent correction system effectively improves the accuracy of methane concentration measurement and reduces the error range, thereby reducing the risk of accidents that may occur in coal mine production and improving the safety of coal mine production. By accurately grasping the methane concentration, coal mine production can more scientifically and reasonably carry out gas control and safe production management, reduce the probability of accidents, and thus reduce potential economic losses.

[0199] Safety benefits: The implementation of the intelligent correction system for optical interference methane detectors provides a more reliable technical means for gas inspection in coal mines. By accurately correcting factors such as oxygen and carbon dioxide, potential safety hazards caused by measurement errors are avoided. The intelligent management of the system makes operation easier and improves the convenience of practical applications. This is of great significance to the life safety of coal miners and the safe and stable operation of coal mine production.

[0200] Environmental benefits: Through precise correction, the optical interference methane detector intelligent correction system helps reduce gas emissions in coal mines. While ensuring the safety of coal mine production, it effectively controls the release of harmful gases such as methane, which has a positive impact on improving the underground environment and reducing pollution to groundwater and air.

[0201] Social benefits: The implementation of the intelligent correction system not only improves the safety and efficiency of coal mine production, but also has a positive effect on the entire society. By reducing the occurrence of accidents, it not only reduces the risk of injury and life safety of coal miners, but also reduces the negative impact of coal mine accidents on society. At the same time, it improves the sustainability of coal mine production and makes a positive contribution to social stability and sustainable development.

[0202] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for correcting the influencing factors of a coal mine optical interference methane detector, characterized in that: include: S1: Compare the test results of the on-site coal mine optical interferometric methane detector with other methane detection devices to determine the error of the interferometric methane detector; S2: Eliminate interference from irrelevant factors based on on-site data analysis; S3: Calibrate the optical interferometry methane detector in coal mines; S4: Compounding experimental gases in the laboratory using the inversion method; S5: Taking the data of methane concentration measured by the on-site optical interferometer methane detector as samples and the actual data on site as standards, an experiment of measuring experimental gas by the optical interferometer methane detector is carried out in the laboratory, and the laboratory data is analyzed to obtain the influencing factors of the measurement error; S6: Sort and analyze the coal mine site and laboratory data to correct the accuracy of the optical interferometry methane detector.

2. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 1, characterized in that: The step S1 includes: comparing the test results of several optical interference methane detectors with those of portable methane detection alarms, methane sensors, and gas chromatographs to determine whether errors exist in the interference methane detectors.

3. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 2, characterized in that: The step S2 comprises: Judge the accuracy of the chromatograph; judge the impact of changes in environmental parameters such as temperature, humidity, and air pressure; judge the impact of unknown combustible gases on the site on the measurement results.

4. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 3, characterized in that: The step S3 includes: calibration of the optical interference methane detector including accuracy, appearance and interference fringe verification.

5. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 1, characterized in that: The step S4 comprises: S401: Use detection instruments to measure the gas concentration in the goaf and return air corner of the working face, and select specific data; S402: Compounding the experimental gas in the laboratory using an inversion method based on the selected specific data.

6. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 5, characterized in that: In the step S401, the detection instrument includes an optical interference methane detector and a gas chromatograph, and the measurement result of the gas chromatograph is used as the standard result; The step S401 specifically includes: numbering multiple optical interference methane detectors in sequence, multiple people simultaneously conducting detection at the same location and recording the results, and using a balloon to take a gas sample from the detection location to the ground for analysis by a gas chromatograph to select specific data; wherein the detection location includes the goaf area and return air corner of the coal mining working face; the specific data are the six groups of data with the highest frequency of occurrence in the goaf area and return air corner of the working face measured on site.

7. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 6, characterized in that: In the step S402, the compounding of experimental gas refers to compounding of gas components manually in the laboratory according to the gas analysis results of the gas chromatograph during the on-site measurement, so as to restore the gas components on the coal mine site to the greatest extent.

8. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 7, characterized in that: In the step S5, the experimental process includes: first, the first round of experiments is carried out while maintaining the original state of the optical interference methane detector, and then the second round of experiments is carried out after the optical interference methane detector is overhauled and reaches the standard error range, and finally the third round of experiments is carried out using a gas chromatograph; the experiments use oxygen, carbon monoxide, carbon dioxide, coal mine on-site compound mixed gas samples and adsorbents as investigation factors, and the specific parameter settings are as follows: 13% to 20% oxygen is prepared based on nitrogen, and one is prepared for every 1%; 0.1% to 0.6% carbon dioxide is prepared based on air, and one is prepared for every 0.1%; 0.04% to 0.09% carbon monoxide is prepared based on air, and one is prepared for every 0.01%; six groups of gas samples with the highest frequency in the goaf and return air corners of the working face are compounded; and the adsorbent particle size, drug amount, and drug discoloration loss are configured.

9. The method for correcting the influencing factors of the coal mine optical interference methane detector according to claim 8, characterized in that: The step S6 includes: performing data fitting on the field detection data and the laboratory measured data to obtain a correction formula for the difference of the optical interference methane detector under the difference of the environmental gas composition in different regions, and further verifying the field detection data to make its error value within the allowable range; and correcting the accuracy of the optical interference methane detector based on the correction formula.

10. An intelligent correction system for influencing factors of a coal mine optical interference methane detector, characterized in that: The system is used to implement the correction method of the influencing factors of the coal mine optical interference methane detector according to any one of claims 1 to 9, and the system comprises: The comparison module is used to compare the detection results of the on-site coal mine optical interference methane detector with other methane detection devices to determine whether the interference methane detector has errors; Interference elimination module, used to: eliminate interference from irrelevant factors based on on-site data analysis; Calibration module, used for: calibrating coal mine optical interference methane detector; Compounding module, used to: compound experimental gas in the laboratory using the inversion method; The influencing factor determination module is used to: take the data of methane concentration measured by the on-site optical interference methane detector as a sample, take the actual data on site as a standard, conduct an experiment of measuring experimental gas by the optical interference methane detector in the laboratory, and analyze the laboratory data to obtain the influencing factors of the measurement error; Correction module: Sort and analyze the coal mine site and laboratory data to correct the accuracy of the optical interference methane detector.

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