Methane determinator determination error correction method, system, equipment and medium

Abstract

The invention belongs to the technical field of underground gas detection, and discloses a methane determinator determination error correction method, system, equipment and medium, and the method comprises the following steps: preparing methane standard gas samples with different oxygen concentration conditions, and selecting a plurality of methane determinators; methane concentrations of the methane standard gas samples under different oxygen concentration conditions are measured through the methane measuring instruments; calculating a methane concentration mean value according to the measured methane concentration, and calculating an error value between the methane concentration mean value measured by each methane measuring instrument under different oxygen concentrations and on-site actual concentration data; and calculating variation trend data between the error value and the oxygen concentration, performing data fitting based on the data calculated in each step to obtain a correction formula, and correcting the methane measurement data to be corrected based on the correction formula. According to the technical scheme, the accuracy of gas inspection work can be guaranteed, and meanwhile underground production safety is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of underground gas detection, and in particular relates to a method, system, equipment and medium for correcting measurement errors of a methane measuring instrument. Background Art

[0002] Coal mine gas is an explosive gas, the main component of which is CH4. The Coal Mine Safety Regulations stipulate that when the CH4 volume fraction at the location where the methane sensor is set reaches specific values ​​such as 0.5%, 1%, and 1.5%, an alarm or power-off response is required. At present, the technical principles used for CH4 concentration detection in coal mines mainly include: catalytic combustion method, thermal conductivity method, optical interferometry, non-dispersive infrared spectroscopy (NDIR), and tunable semiconductor laser absorption spectroscopy (TDLAS). Due to the main factors influencing the coal mine environment, such as large coal dust, large temperature differences, large humidity, electromagnetic interference, and complex gas composition, the measurement accuracy and stability of methane detection technology will be adversely affected, resulting in inaccurate or even erroneous measurement results. As an instrument used for CH4 concentration detection in coal mines, the optical interferometry methane meter has a large difference between the CH4 value detected at the return air corner of the working face and the true value, which leads to safety hazards. Summary of the invention

[0003] The purpose of the present invention is to provide a method, system, device and medium for correcting measurement errors of a methane measuring instrument to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides a method for correcting measurement errors of a methane measuring instrument, comprising:

[0005] Step 1: Prepare methane standard gas samples with different oxygen concentrations and select several methane measuring instruments;

[0006] Step 2: measuring the methane concentration of the methane standard gas samples under different oxygen concentration conditions by each of the methane measuring instruments;

[0007] Step 3: Calculate the mean methane concentration according to the measured methane concentration, and calculate the error value between the mean methane concentration measured by each methane measuring instrument at different oxygen concentrations and the actual concentration data on site;

[0008] Step 4: Count the variation trend data between the error value and the oxygen concentration, perform data fitting based on the data calculated in each step, obtain a correction formula, and correct the methane measurement data to be corrected based on the correction formula.

[0009] Optionally, the step one further includes: performing an equipment inspection on each of the methane measuring instruments, and measuring the methane concentration based on the methane measuring instruments that have passed the equipment inspection.

[0010] Optionally, each of the methane measuring instruments is subjected to an equipment inspection, specifically including:

[0011] Perform appearance inspection and performance inspection on each of the methane measuring instruments.

[0012] Optionally, the process of acquiring the actual on-site concentration data specifically includes:

[0013] The methane concentration of methane standard gas samples under different oxygen concentration conditions is detected by chromatography as the actual on-site concentration data.

[0014] Optionally, the correction formula is specifically:

[0015] Y=-0.14X1+2.89,C 校 =C 光 -Y=C 光 -(-0.14X1+2.89)

[0016] In the formula, Y is the correction coefficient, X1 is the O2 concentration, C 校 is the CH4 concentration correction value, C 光 It is the CH4 concentration measured by the optical interferometer methane meter.

[0017] A methane measuring instrument measurement error correction system, comprising:

[0018] The measurement preparation module is used to configure methane standard gas samples with different oxygen concentration conditions and select several methane measuring instruments;

[0019] A measuring module, used for measuring the methane concentration of methane standard gas samples under different oxygen concentration conditions by means of each of the methane measuring instruments;

[0020] The correction module is used to calculate the mean methane concentration according to the measured methane concentration, calculate the error value between the mean methane concentration measured by each methane measuring instrument under different oxygen concentrations and the actual concentration data on site; statistically analyze the change trend data between the error value and the oxygen concentration, perform data fitting based on the data calculated in each step, obtain a correction formula, and correct the methane measurement data to be corrected based on the correction formula.

[0021] An electronic device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the method for correcting measurement errors of a methane measuring instrument.

[0022] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for correcting measurement errors of a methane measuring instrument is implemented.

[0023] The technical effects of the present invention are:

[0024] The optical interference type methane measuring instrument measurement error correction method disclosed in the present invention corrects the error of the optical interference type methane measuring instrument in measuring CH4 concentration, ensures the accuracy of gas inspection work, ensures the safety of underground production; and can avoid the economic losses caused by mine gas disasters caused by inaccurate gas concentration detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 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.

[0026] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 A variation trend diagram of the difference between the mean value of CH4 detected by the methane detector and the standard gas value as the O2 concentration changes, using partial data in an embodiment of the present invention;

[0028] Figure 2 Comparison of the corrected CH4 concentration error difference and the original error difference in the first example in the embodiment of the present invention;

[0029] Figure 3 The comparison between the corrected CH4 concentration error difference and the original error difference in the second example in the embodiment of the present invention;

[0030] Figure 4 4 is a calibration flow chart in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0032] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0033] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art generally understood by the present invention. Although the present invention describes only preferred methods, any method similar or equivalent to that described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0034] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present application description and examples are exemplary only.

[0035] The words “include,” “including,” “have,” “contain,” etc. used in this article are open-ended terms, meaning including but not limited to.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] Embodiment 1

[0038] like Figure 1 - Figure 4 As shown, this embodiment provides a method for correcting measurement errors of a methane measuring instrument, comprising:

[0039] Step 1: Prepare methane standard gas samples with different oxygen concentrations and select several methane measuring instruments;

[0040] Step 2: measuring the methane concentration of the methane standard gas samples under different oxygen concentration conditions by each of the methane measuring instruments;

[0041] Step 3: Calculate the mean methane concentration according to the measured methane concentration, and calculate the error value between the mean methane concentration measured by each methane measuring instrument at different oxygen concentrations and the actual concentration data on site;

[0042] Step 4: Count the variation trend data between the error value and the oxygen concentration, perform data fitting based on the data calculated in each step, obtain a correction formula, and correct the methane measurement data to be corrected based on the correction formula.

[0043] This embodiment provides a method for correcting the measurement error of an optical interference methane measuring instrument, comprising the following steps:

[0044] S1: Configure standard gas samples with different oxygen concentration conditions in the laboratory;

[0045] S2: Select three optical interferometry methane meters, namely CJG10D, CJG10, and CJG10B. The parameters of the optical interferometry methane meters are as follows: CJG10 optical interferometry methane meter, unique identification is AYC20211706-1, the manufacturer is Hunan Coal Mine Safety Equipment Co., Ltd., and the factory number is 1712060; CJG10D optical interferometry methane meter, unique identification is AYC20211706-2, the manufacturer is Xi'an Heavy Equipment Mining Electrical Equipment Co., Ltd., and the factory number is 1404738; CJG10B optical interferometry methane meter, unique identification is AYC20211706-3, the manufacturer is Hunan Coal Mine Safety Equipment Co., Ltd., and the factory number is 1906191.

[0046] S3: The laboratory inspected and tested the appearance, interference fringes, and basic errors of three different types of optical interference methane detectors. The appearance inspection results showed that the paint and electroplating layers were uniform, firm, and consistent in color, and the optical parts had no significant mildew, bubbles, sand holes, pitting, scratches, fingerprints, and dust; there was no debonding after the optical parts were glued; there was no debonding on the coated optical parts, the instrument parts were firmly and reliably connected, and the tightness was appropriate, and the rotating parts of the instrument rotated smoothly and flexibly. The interference fringe inspection results showed that there was enough field of view to observe the interference fringes, the interference fringes were clear, without significant bending and tilting, the reference interference fringes did not change levels within the entire scale range, there was no sudden jump when adjusting the interference fringes, there was no obvious secondary image in the field of view, and when adjusting the telescope eyepiece, the graticule image did not shake significantly. The test results can rule out errors caused by quality problems of the instrument itself during the determination of CH4 concentration.

[0047] S4: Use the above three optical interference methane detectors to detect the CH4 concentration of standard gas samples under different oxygen concentration conditions;

[0048] S5: According to the test results, the difference between the mean value of CH4 measured by the optical interference methane meter and the value of CH4 in the standard gas is calculated. Some results are as follows: when the O2 concentration is 14%, the difference is 0.995%; when the O2 concentration is 15%, the difference is 0.780%; when the O2 concentration is 16%, the difference is 0.735%; when the O2 concentration is 17%, the difference is 0.595%; when the O2 concentration is 18%, the difference is 0.455%; when the O2 concentration is 19%, the difference is 0.260%;

[0049] S6: Statistical analysis of the data measured in the laboratory showed that the difference between the mean value of CH4 measured by the optical interference methane meter and the value of CH4 in the standard gas varies within a certain range. The overall trend is that the higher the O2 concentration, the smaller the difference.

[0050] S7: Perform data fitting on the laboratory measured data to obtain the corresponding relationship between the CH4 concentration value measured by the optical interference methane meter and the correction value, Y = -0.14X1 + 2.89, C 校 =C 光 -Y=C 光 -(-0.14X1+2.89), Y is the correction factor, X1 is the O2 concentration, C 校 is the CH4 concentration correction value, C 光 is the CH4 concentration measured by the optical interferometer methane meter;

[0051] The error correction method for the optical interferometer methane meter disclosed in the present embodiment corrects the error of the optical interferometer methane meter in measuring CH4 concentration, ensures the accuracy of gas inspection work, and ensures the safety of underground production; the error correction method for the optical interferometer methane meter disclosed in the present embodiment avoids the economic losses caused by mine gas disasters due to inaccurate gas concentration detection.

[0052] For the first calculation example, see Figure 2 A method for correcting the measurement error of an optical interference methane meter is provided. According to the detection of relevant parameters and concentration of air in a closed drainage tunnel of a certain working face of a certain mine, the correction formula obtained from the laboratory data is brought into the field detection data to correct the measurement error of the optical interference methane meter, which includes the following steps:

[0053] A. Determine the O2 concentration on the working surface;

[0054] B. Use the optical interference methane meter to detect the CH4 concentration of the working surface and obtain the CH4 concentration value C 光 ;

[0055] C. On-site chromatographic detection of CH4 concentration value C 实 ;

[0056] D. Based on the corresponding relationship between the CH4 concentration value and the correction value measured by the optical interference methane meter obtained from the laboratory data, the CH4 concentration correction value C is calculated. 校 , Y=-0.14X1+2.89, C 校 =C 光 -Y=C 光 -(-0.14X1+2.89), Y is the correction factor, X1 is the O2 concentration, C 校 is the CH4 concentration correction value, C 光 is the CH4 concentration measured by the optical interferometer methane meter;

[0057] E. Comparison of the corrected CH4 mean value with the on-site chromatographic detection value shows that the error difference after correction is between 0.21% and 0.34%, while the error difference of the uncorrected CH4 concentration is between 3.32% and 4.23%.

[0058] For the second calculation example, see Figure 3 A method for correcting the measurement error of an optical interference methane meter is provided. According to the detection of air-related parameters and concentrations in the return air corner of a certain working face of a certain mine, the correction formula obtained from the laboratory data is brought into the field detection data to correct the measurement error of the optical interference methane meter, which includes the following steps:

[0059] A. Determine the O2 concentration on the working surface;

[0060] B. Use the optical interference methane meter to detect the CH4 concentration of the working surface and obtain the CH4 concentration value C 光 ;

[0061] C. On-site chromatographic detection of CH4 concentration value C 实 ;

[0062] D. Based on the corresponding relationship between the CH4 concentration value and the correction value measured by the optical interference methane meter obtained from the laboratory data, the CH4 concentration correction value C is calculated. 校 , Y=-0.14X1+2.89, C 校 =C 光 -Y=C 光 -(-0.14X1+2.89), Y is the correction factor, X1 is the O2 concentration, C 校 is the CH4 concentration correction value, C 光 is the CH4 concentration measured by the optical interferometer methane meter;

[0063] E. The corrected CH4 mean value was compared with the on-site chromatographic detection value, and the corrected error difference was between 0.06% and 0.121%.

[0064] A methane measuring instrument measurement error correction system, comprising:

[0065] The measurement preparation module is used to configure methane standard gas samples with different oxygen concentration conditions and select several methane measuring instruments;

[0066] A measuring module, used for measuring the methane concentration of methane standard gas samples under different oxygen concentration conditions by means of each of the methane measuring instruments;

[0067] The correction module is used to calculate the mean methane concentration according to the measured methane concentration, calculate the error value between the mean methane concentration measured by each methane measuring instrument under different oxygen concentrations and the actual concentration data on site; statistically analyze the change trend data between the error value and the oxygen concentration, perform data fitting based on the data calculated in each step, obtain a correction formula, and correct the methane measurement data to be corrected based on the correction formula.

[0068] An electronic device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the method for correcting measurement errors of a methane measuring instrument.

[0069] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for correcting measurement errors of a methane measuring instrument is implemented.

[0070] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for correcting measurement errors of a methane measuring instrument, characterized in that: include: Step 1: Prepare methane standard gas samples with different oxygen concentrations and select several methane measuring instruments; Step 2: measuring the methane concentration of the methane standard gas samples under different oxygen concentration conditions by each of the methane measuring instruments; Step 3: Calculate the mean methane concentration according to the measured methane concentration, and calculate the error value between the mean methane concentration measured by each methane measuring instrument at different oxygen concentrations and the actual concentration data on site; Step 4: Count the variation trend data between the error value and the oxygen concentration, perform data fitting based on the data calculated in each step, obtain a correction formula, and correct the methane measurement data to be corrected based on the correction formula.

2. A methane measuring instrument measurement error correction method according to claim 1, characterized in that: The step one further includes: performing equipment inspection on each of the methane measuring instruments, and measuring the methane concentration based on the methane measuring instruments that have passed the equipment inspection.

3. A methane measuring instrument measurement error correction method according to claim 2, characterized in that: Conduct equipment inspection on each of the methane measuring instruments, specifically including: Perform appearance inspection and performance inspection on each of the methane measuring instruments.

4. The method for correcting measurement errors of a methane measuring instrument according to claim 1, characterized in that: The process of obtaining the actual on-site concentration data specifically includes: The methane concentration of methane standard gas samples under different oxygen concentration conditions is detected by chromatography as the actual on-site concentration data.

5. The method for correcting measurement errors of a methane measuring instrument according to claim 1, characterized in that: The correction formula is specifically: Y=-0.14X1+2.89,C 校 =C 光 -Y=C 光 -(-0.14X1+2.89) In the formula, Y is the correction coefficient, X1 is the O2 concentration, C 校 is the CH4 concentration correction value, C 光 It is the CH4 concentration measured by the optical interferometer methane meter.

6. A methane measuring instrument measurement error correction system, characterized in that: include: The measurement preparation module is used to configure methane standard gas samples with different oxygen concentration conditions and select several methane measuring instruments; A measuring module, used for measuring the methane concentration of methane standard gas samples under different oxygen concentration conditions by means of each of the methane measuring instruments; The correction module is used to calculate the mean methane concentration according to the measured methane concentration, calculate the error value between the mean methane concentration measured by each methane measuring instrument under different oxygen concentrations and the actual concentration data on site; statistically analyze the change trend data between the error value and the oxygen concentration, perform data fitting based on the data calculated in each step, obtain a correction formula, and correct the methane measurement data to be corrected based on the correction formula.

7. An electronic device, characterized in that: The electronic device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute a methane measuring instrument measurement error correction method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: It stores a computer program, and when the computer program is executed by a processor, a method for correcting measurement errors of a methane measuring instrument as described in any one of claims 1 to 5 is implemented.

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