A natural gas purification system and method

Abstract

The present invention discloses a natural gas purification system and method, which relates to the technical field of natural gas purification, and includes a gas collection module, a gas sample processing module, a data acquisition module, a monitoring module, a judgment module and an alarm module; the gas collection module collects natural gas gas that needs to be tested for sulfide concentration. The present invention monitors the process of sulfide concentration detection by a gas chromatograph, and when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, notifies the relevant operators to know, and promptly inspects and repairs the gas chromatograph in advance, and performs maintenance and management on the gas chromatograph in advance when abnormal hidden dangers are found in the gas chromatograph, effectively avoiding relevant operators from making decisions based on erroneous data, ensuring that potential problems are detected in time when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, and effectively avoiding leakage of dangerous gases or excessive emissions that endanger personnel safety and the environment.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas purification, and in particular to a natural gas purification system and method. Background Art

[0002] A natural gas purification system is a device or engineering project used to remove impurities and pollutants from natural gas. These pollutants can include hydrogen sulfide, sulfur dioxide, nitrogen oxides, particulate matter, volatile organic compounds, and other impurities. The purpose of purifying natural gas is to improve its quality to meet the requirements of industrial, commercial, and domestic uses, reduce pollution to the environment, and ensure the normal operation of natural gas transmission pipelines and equipment.

[0003] Gas Chromatograph (GC) plays an important role in the natural gas purification system. It is mainly used to analyze and monitor various gas components in natural gas, especially sulfides such as hydrogen sulfide and sulfur dioxide. Gas chromatograph is usually used to analyze the concentration of hydrogen sulfide and sulfur dioxide in natural gas to determine the efficiency of natural gas desulfurization. This is because gas chromatograph is a high-precision instrument that can separate and quantify different gas components, including hydrogen sulfide and sulfur dioxide.

[0004] Gas chromatographs are able to provide highly accurate quantitative analysis, measuring the concentrations of different components in natural gas, which is important for determining the concentrations of sulfides such as hydrogen sulfide and sulfur dioxide to ensure that their concentrations in natural gas meet specified standards.

[0005] The existing technology has the following shortcomings: If the measurement accuracy of the gas chromatograph deteriorates but the gas chromatograph itself is not aware of this problem, it will cause the gas chromatograph to measure the sulfide concentration inaccurately, which means that the system operators will make decisions based on incorrect data and will not be able to detect potential problems in time, which may lead to dangerous gas leakage or excessive emissions, endangering personnel safety and the environment.

[0006] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0007] The purpose of the present invention is to provide a natural gas purification system and method, which monitors the process of sulfide concentration detection by a gas chromatograph, notifies relevant operators when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, and promptly inspects and repairs the gas chromatograph in advance. When abnormal hidden dangers are found in the gas chromatograph, the gas chromatograph is maintained and managed in advance, effectively avoiding relevant operators from making decisions based on erroneous data, ensuring that potential problems are detected in time when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, and effectively avoiding leakage of dangerous gases or excessive emissions that endanger personnel safety and the environment, so as to solve the problems in the above-mentioned background technology.

[0008] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a natural gas purification system, including a gas collection module, a gas sample processing module, a data acquisition module, a monitoring module, a judgment module and an alarm module;

[0009] A gas collection module collects natural gas that needs to be tested for sulfide concentration and transmits the collected natural gas to a gas sample processing module;

[0010] The gas sample processing module is used to pre-process the collected natural gas samples to remove interfering substances before analysis. After the processing is completed, the processed natural gas samples are introduced into the gas chromatograph for detection;

[0011] The data acquisition module collects a number of data information when the gas chromatograph in the natural gas purification system detects sulfide concentration, including fluid dynamics parameter information and performance information. After the data is collected, the fluid dynamics parameter information and performance information of the gas chromatograph during operation are processed and uploaded to the monitoring module;

[0012] The monitoring module comprehensively monitors the processed fluid dynamic parameter information and performance information when the gas chromatograph detects sulfide concentration, generates a detection evaluation coefficient, and transmits the detection evaluation coefficient to the judgment module;

[0013] The judgment module compares and analyzes the detection evaluation coefficient generated by the gas chromatograph when performing sulfide concentration detection with a preset detection evaluation coefficient reference threshold, generates a first hidden danger signal or a second hidden danger signal, and transmits the signal to the alarm module, which issues an alarm prompt for the first hidden danger signal through the alarm module.

[0014] Preferably, the fluid dynamic parameter information when the gas chromatograph in the natural gas purification system detects the sulfide concentration includes the carrier gas flow rate drift index and the operating pressure anomaly concealment index, and the performance characteristic information when the gas chromatograph in the natural gas purification system detects the sulfide concentration includes the detector linear response instability index. After collection, the carrier gas flow rate drift index and the operating pressure anomaly concealment index are calibrated as ψ respectively through the data acquisition module. QL and λ YL , the detector linear response instability index is calibrated as ζ XX .

[0015] Preferably, the monitoring module detects the sulfide concentration in the gas chromatograph of the natural gas purification system and measures the carrier gas flow rate drift index ψ QL , Operation pressure abnormal concealment index λ YL and the detector linear response instability index ζ XX Perform a formulaic analysis to generate the detection evaluation coefficient φφ, based on the formula: Where f1, f2, and f3 are the carrier gas velocity drift index ψ QL , Operation pressure abnormal concealment index λ YL , detector linear response instability index ζ XX The preset proportional coefficient, and f1, f2, and f3 are all greater than 0.

[0016] Preferably, the judgment module compares and analyzes the detection evaluation coefficient generated when the gas chromatograph performs sulfide concentration detection with a preset detection evaluation coefficient reference threshold, and the result of the comparison and analysis is as follows:

[0017] If the detection evaluation coefficient is greater than or equal to the detection evaluation coefficient reference threshold, a first hidden danger signal is generated by the judgment module, and the signal is transmitted to the alarm module, and an alarm prompt is issued for the first hidden danger signal by the alarm module to inform relevant operators;

[0018] If the detection evaluation coefficient is less than the detection evaluation coefficient reference threshold, a second hidden danger signal is generated by the judgment module and the signal is transmitted to the alarm module, and an alarm prompt is not issued for the second hidden danger signal through the alarm module.

[0019] Preferably, the logic for obtaining the carrier gas flow rate drift index is as follows:

[0020] S101, obtaining the optimal carrier gas flow rate range when the gas chromatograph performs sulfide concentration detection, and calibrating the optimal carrier gas flow rate range as [ψ QL min , ψ QL max ];

[0021] S102, obtaining the actual carrier gas flow rate at different times during the time T when the gas chromatograph performs sulfide concentration detection, and calibrating the actual carrier gas flow rate as ψ QL v , v represents the number of the actual carrier gas flow rate at different times within the time T when the gas chromatograph performs sulfide concentration detection, v = 1, 2, 3, 4, ..., w, w is a positive integer;

[0022] S103, calculating the carrier gas flow rate drift index, the calculation expression is: In the formula, ψ QL v' represents the actual carrier gas flow rate that is not within the optimal carrier gas flow rate range obtained within T time when the gas chromatograph performs sulfide concentration detection, v' represents the number of the actual carrier gas flow rate that is not within the optimal carrier gas flow rate range obtained within T time when the gas chromatograph performs sulfide concentration detection, v'=1, 2, 3, 4, ..., w', w' is a positive integer,

[0023] Preferably, the logic for obtaining the operating pressure anomaly concealment index is as follows:

[0024] S201, obtaining the actual operating pressure at different times during the T time when the gas chromatograph performs sulfide concentration detection, and calibrating the actual operating pressure as λ YL y , y represents the number of the actual operating pressure at different times during the T time when the gas chromatograph performs sulfide concentration detection, y=1, 2, 3, 4, ..., n, n is a positive integer;

[0025] S202, calculating the operating pressure abnormal concealment index, the calculation expression is: n represents the total number of actual operating pressures obtained within T time when the gas chromatograph performs sulfide concentration detection.

[0026] Preferably, the logic of obtaining the detector linear response instability index is as follows:

[0027] S301, obtaining a plurality of signal intensities generated by a detector in a gas chromatograph during a T time period when performing sulfide concentration detection and the sulfide concentration at the corresponding signal intensities, and calibrating the signal intensities and the sulfide concentrations as ζ 信号 x and 浓度 x , x represents the number of signal intensities generated by the detector in the gas chromatograph during the time T when detecting the sulfide concentration and the sulfide concentration under the corresponding signal intensities, x=1, 2, 3, 4, ..., m, m is a positive integer;

[0028] S302, calculating the linear response ratio of the detector by using a plurality of signal intensities generated during the T time when the detector in the gas chromatograph detects the sulfide concentration and the sulfide concentration under the corresponding signal intensities, and the calculation expression is: 线性 x =ζ 信号 x / ζ 浓度 x , where ζ 线性 x It represents the linear response ratio of the detector;

[0029] S303, when the sulfide concentration is detected by the detector in the gas chromatograph, a plurality of detector linear response ratios ζ generated within T time 线性 x Calculate the standard deviation of the detector linear response ratio. The expression is: Wherein, ζ1 represents the standard deviation of the detector linear response ratio, ζ2 is the average value of the detector linear response ratio calculated by using several detector linear response ratios when the detector in the gas chromatograph detects sulfide concentration,

[0030] S304, calculating the detector linear response instability index, the calculation expression is: Where ζ1 / ζ2 represents the variation of the linear response ratio of several detectors generated within T time when the detector in the gas chromatograph detects sulfide concentration.

[0031] Preferably, it also includes a feedback module;

[0032] The feedback module analyzes several detection evaluation coefficients generated by the monitoring module during the maintenance of the gas chromatograph to ensure the successful maintenance of the gas chromatograph;

[0033] The feedback module establishes a data set for several detection evaluation coefficients generated by the monitoring module during gas chromatograph maintenance, and calibrates the data set as Z, then Z = {φφ u}, u represents the number of several detection evaluation coefficients in the data set, u = 1, 2, 3, 4, ..., s, s is a positive integer;

[0034] The detection evaluation coefficient standard deviation and the detection evaluation coefficient average value are calculated through the detection evaluation coefficient in the data set, and the generated detection evaluation coefficient standard deviation and the detection evaluation coefficient average value are respectively compared and analyzed with the pre-set standard deviation reference threshold and the pre-set detection evaluation coefficient reference threshold in real time. When the detection evaluation coefficient standard deviation is less than the standard deviation reference threshold and the detection evaluation coefficient average value is less than the detection evaluation coefficient reference threshold, a maintenance management success signal is generated through the feedback module and the signal is transmitted to the mobile terminal, prompting the gas chromatograph maintenance management success through the mobile terminal.

[0035] A natural gas purification method comprises the following steps:

[0036] S1. Collect natural gas that needs to be tested for sulfide concentration, and subject the collected natural gas samples to a pretreatment step to remove interfering substances before analysis. After the treatment is completed, introduce the treated natural gas samples into a gas chromatograph for testing;

[0037] S2. Collecting multiple data information when the gas chromatograph in the natural gas purification system detects sulfide concentration, including fluid dynamics parameter information and performance information, and after collection, processing the fluid dynamics parameter information and performance information when the gas chromatograph is running;

[0038] S3, comprehensively monitoring the processed fluid dynamic parameter information and performance information when the gas chromatograph performs sulfide concentration detection, and generating a detection evaluation coefficient;

[0039] S4, comparing and analyzing the detection evaluation coefficient generated when the gas chromatograph performs sulfide concentration detection with a preset detection evaluation coefficient reference threshold, generating a first hidden danger signal or a second hidden danger signal, and issuing an alarm prompt for the first hidden danger signal;

[0040] S5. Analyze several detection evaluation coefficients generated during gas chromatograph maintenance to ensure successful maintenance of the gas chromatograph.

[0041] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0042] The present invention monitors the process of sulfide concentration detection by the gas chromatograph, notifies relevant operators when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, and promptly inspects and repairs the gas chromatograph in advance. When the gas chromatograph is found to have abnormal hidden dangers, the gas chromatograph is maintained and managed in advance, effectively avoiding relevant operators from making decisions based on erroneous data, ensuring that potential problems are detected in time when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, and effectively avoiding leakage of dangerous gases or excessive emissions that endanger personnel safety and the environment;

[0043] The present invention comprehensively analyzes the real-time operating status of the gas chromatograph during maintenance, observes the maintenance status of the gas chromatograph in real time, prevents relevant maintenance personnel from maintaining the gas chromatograph based on their own experience, and causes the gas chromatograph to have abnormal hidden dangers of measurement accuracy again, thereby ensuring successful maintenance of the gas chromatograph and ensuring stable and efficient operation of the gas chromatograph. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application 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 recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0045] Figure 1 The module diagram of a natural gas purification system and method of the present invention is shown in FIG.

[0046] Figure 2 The present invention is a method flow chart of a natural gas purification system and method. DETAILED DESCRIPTION

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0048] The present invention provides Figure 1 A natural gas purification system shown includes a gas collection module, a gas sample processing module, a data acquisition module, a monitoring module, a judgment module and an alarm module;

[0049] A gas collection module collects natural gas that needs to be tested for sulfide concentration and transmits the collected natural gas to a gas sample processing module;

[0050] Natural gas is usually extracted from the natural gas stream through pipelines or sampling tanks. When sampling, it is necessary to ensure the representativeness and integrity of the sample;

[0051] The gas sample processing module is used to pre-process the collected natural gas samples to remove interfering substances before analysis. After the processing is completed, the processed natural gas samples are introduced into the gas chromatograph for detection;

[0052] The purpose of removing interfering substances is to improve the accuracy of the analysis, which includes removing water, impurities and other interferents;

[0053] Once the gas sample enters the gas chromatograph, it will be separated by a chromatographic column. The chromatographic column is a long, thin tube with a specific type of coating (such as polysiloxane) on the inside. This coating separates the compounds based on their affinity and molecular size. Once the sulfide compounds are separated, they enter the detector. The gas chromatograph will use different types of detectors. The most common ones are Flame Photometric Detector (FPD) or Sulfur-Selective Detector (Sulfur-Selective Detector) to detect sulfide compounds and generate corresponding signals. The signal generated by the detector is recorded and compared with a standard curve of known sulfide compounds to determine the concentration of sulfide in the sample. Usually, the concentration is expressed in ppm (parts per million) or ppb (parts per billion);

[0054] The data acquisition module collects a number of data information when the gas chromatograph in the natural gas purification system detects sulfide concentration, including fluid dynamics parameter information and performance information. After the data is collected, the fluid dynamics parameter information and performance information of the gas chromatograph during operation are processed and uploaded to the monitoring module;

[0055] The fluid dynamics parameter information of the gas chromatograph in the natural gas purification system for sulfide concentration detection includes the carrier gas flow rate drift index and the operating pressure anomaly concealment index. After collection, the carrier gas flow rate drift index and the operating pressure anomaly concealment index are calibrated as ψ QL and λ YL ;

[0056] The carrier gas flow rate when the gas chromatograph is used to detect the concentration of sulfide refers to the gas flow rate used to carry the gas sample through the chromatographic column for analysis in the gas chromatograph. In the gas chromatograph, the carrier gas is an inert gas, usually helium, nitrogen or hydrogen, which is used to transport the sample gas to be tested into the chromatographic column in order to separate and detect different gas components;

[0057] In the natural gas purification system, the carrier gas flow rate of the gas chromatograph will affect the accuracy of sulfide concentration measurement. A large or small carrier gas flow rate may lead to poor accuracy. The specific reasons are as follows:

[0058] Large carrier gas flow rate:

[0059] Decreased precision: When the carrier gas flow rate is larger, the compounds move faster in the GC column, which may lead to insufficient separation between different sulfide compounds in the analysis because the sulfide compounds do not have enough time to separate in the packing, which will cause the peaks of different sulfides to overlap, making it difficult to accurately identify and quantify;

[0060] Lack of resolution: High carrier gas flow rates may reduce resolution and make the differences between sulfide compounds less distinct, which can lead to inaccurate measurements, especially when it is necessary to distinguish between similar sulfides;

[0061] The carrier gas flow rate is low:

[0062] Improved separation: A smaller carrier gas flow rate allows compounds to move more slowly in the column, giving them enough time to interact with the packing, leading to better separation of different sulfide compounds. This may improve resolution and separation performance, helping to accurately measure sulfide concentrations;

[0063] Increased analysis time: Lower carrier gas flow rates may require longer analysis times to complete the separation, but this generally results in greater precision and accuracy;

[0064] Therefore, by testing the carrier gas flow rate when the gas chromatograph in the natural gas purification system detects the sulfide concentration, it is possible to promptly discover the potential problem that the carrier gas flow rate of the gas chromatograph is too large or too small, which may cause the gas chromatograph to have poor measurement accuracy for sulfides.

[0065] The logic of obtaining the carrier gas flow rate drift index is as follows:

[0066] S101, obtaining the optimal carrier gas flow rate range when the gas chromatograph performs sulfide concentration detection, and calibrating the optimal carrier gas flow rate range as [ψ QL min , ψ QL max ];

[0067] It should be noted that, first of all, the analytical requirements for sulfide concentration detection need to be clearly defined, including the target sulfide composition, the concentration range of detection, the resolution, the detection limit, etc. These requirements will guide subsequent experiments and optimizations. At the beginning, an appropriate initial value of the carrier gas flow rate can be selected, which is usually the recommended flow rate for common carrier gases (such as helium) under standard experimental conditions. This initial value can be used as a starting point, and the initial carrier gas flow rate is used for analysis to obtain initial results. According to the initial results, the carrier gas flow rate is gradually adjusted. Generally speaking, if the separation is insufficient, you can try to increase the flow rate, and if the separation is too good, you can try to reduce the flow rate. It is generally recommended to gradually optimize the flow rate with small changes to find the optimal carrier gas flow rate range for gas chromatograph to detect sulfide concentration. The optimal carrier gas flow rate range for gas chromatograph to detect sulfide concentration is not specifically limited here and can be adjusted according to actual needs and experimental results.

[0068] S102, obtaining the actual carrier gas flow rate at different times during the time T when the gas chromatograph performs sulfide concentration detection, and calibrating the actual carrier gas flow rate as ψ QLv , v represents the number of the actual carrier gas flow rate at different times within the time T when the gas chromatograph performs sulfide concentration detection, v = 1, 2, 3, 4, ..., w, w is a positive integer;

[0069] It should be noted that a flow meter is an instrument used to measure the flow rate of a gas. A gas chromatograph is usually equipped with a flow meter that can be used to monitor the flow rate of a carrier gas in real time. The flow meter usually displays the flow rate in milliliters per minute (mL / min) or milliliters per hour (mL / h).

[0070] S103, calculating the carrier gas flow rate drift index, the calculation expression is: In the formula, ψ QL v' represents the actual carrier gas flow rate that is not within the optimal carrier gas flow rate range obtained within T time when the gas chromatograph performs sulfide concentration detection, v' represents the number of the actual carrier gas flow rate that is not within the optimal carrier gas flow rate range obtained within T time when the gas chromatograph performs sulfide concentration detection, v'=1, 2, 3, 4, ..., w', w' is a positive integer,

[0071] From the calculation expression of the carrier gas flow rate drift index, it can be seen that the greater the value of the carrier gas flow rate drift index generated within the T time when the gas chromatograph in the natural gas purification system detects the sulfide concentration, the greater the hidden danger of the measurement accuracy deterioration when the gas chromatograph measures the sulfide concentration. Conversely, the smaller the hidden danger of the measurement accuracy deterioration when the gas chromatograph measures the sulfide concentration.

[0072] In the natural gas purification system, the operating pressure of the gas chromatograph for sulfide concentration detection refers to the gas pressure used to push the carrier gas and sample gas through the analysis system during the chromatographic analysis process. This operating pressure is a key operating parameter that affects the efficiency, separation performance and accuracy of the analysis.

[0073] Large fluctuations in the operating pressure of the gas chromatograph may result in poor accuracy in the measurement of sulfide concentrations, because the operating pressure is a key parameter that affects the separation efficiency and analytical performance of the gas chromatograph. The following is a detailed explanation:

[0074] Separation efficiency is affected: changes in operating pressure will directly affect the speed at which the gas sample passes through the chromatographic column in the gas chromatograph. If the operating pressure becomes too high, the gas sample may pass through the column too quickly, resulting in the inability to fully separate different sulfide components. On the contrary, if the operating pressure is too low, the gas sample flow rate may decrease, resulting in longer analysis time, but the separation efficiency may be improved. Therefore, the instability of the operating pressure will affect the separation of sulfide components, thereby affecting the accuracy;

[0075] Peak shape is affected: In gas chromatography analysis, sulfide components usually appear in the form of peaks on the chromatogram. When the operating pressure changes greatly, the shape of the peak may change, which will directly affect the concentration measurement. The change in peak shape may make it difficult to accurately measure the peak area, thereby reducing the accuracy of concentration measurement;

[0076] Impaired repeatability: Changes in operating pressure will reduce the repeatability of the analysis. If the operating pressure varies significantly between analyses, the results between different analyses may differ, making the sulfide concentration measurement unreliable.

[0077] Inaccurate concentration measurements: Ultimately, when the operating pressure is unstable, the accuracy of sulfide concentration measurements is affected. Sulfide concentration is usually determined by measuring the area or height of the peak. If the shape and size of the peak are unstable, then the concentration measurement will be inaccurate;

[0078] Therefore, by testing the operating pressure of the gas chromatograph in the natural gas purification system when detecting the sulfide concentration, it is possible to timely discover the hidden danger that the large fluctuation of the operating pressure of the gas chromatograph may cause the gas chromatograph to have a poor measurement accuracy for sulfides.

[0079] The logic for obtaining the operational pressure anomaly concealment index is as follows:

[0080] S201, obtaining the actual operating pressure at different times during the T time when the gas chromatograph performs sulfide concentration detection, and calibrating the actual operating pressure as λ YL y , y represents the number of the actual operating pressure at different times during the T time when the gas chromatograph performs sulfide concentration detection, y=1, 2, 3, 4, ..., n, n is a positive integer;

[0081] It should be noted that the pressure sensor is a device specially designed to measure gas pressure. The pressure sensor can be installed in the pipeline or analysis system of the gas chromatograph to monitor the changes in operating pressure. The pressure sensor can usually provide real-time operating pressure readings and transmit these data to the instrument's control system or data acquisition system;

[0082] S202, calculating the operating pressure abnormal concealment index, the calculation expression is: n represents the total number of actual operating pressures obtained within T time when the gas chromatograph performs sulfide concentration detection;

[0083] From the calculation expression of the operating pressure anomaly concealment index, it can be seen that the greater the performance value of the operating pressure anomaly concealment index generated within the T time when the gas chromatograph in the natural gas purification system detects the sulfide concentration, the greater the hidden danger of the measurement accuracy deterioration when the gas chromatograph measures the sulfide concentration, and vice versa, the smaller the hidden danger of the measurement accuracy deterioration when the gas chromatograph measures the sulfide concentration;

[0084] The performance characteristics of the gas chromatograph in the natural gas purification system when detecting sulfide concentration include the detector linear response instability index. After collection, the detector linear response instability index is calibrated as ζ through the data acquisition module. XX ;

[0085] The linear response of the gas chromatograph detector refers to the characteristic that the detector responds linearly to the concentrations of different compounds in the sample, which means that when the concentration of the compound changes within a certain range, there is a direct, proportional relationship between the detector output signal (usually expressed as absorbance or signal intensity) and the concentration. The existence of linear response enables the gas chromatograph to quantitatively measure the concentration of various components in the sample, because the relationship between concentration and detection signal is predictable and stable;

[0086] When the linear response stability of the gas chromatograph detector is poor, the accuracy of the measurement of the sulfide concentration in natural gas will deteriorate. This is because the unstable linear response of the detector will cause the following problems:

[0087] Inaccurate quantification: Instability in the linear response will cause the detector to respond inconsistently at different concentrations, which means that the proportional relationship between the detection signal and the concentration will change. Therefore, when measuring sulfide concentration, inaccurate quantification will occur. Even if the concentration does not actually change, the instrument may produce inconsistent measurement results.

[0088] Difficulty in establishing an accurate calibration curve: The calibration curve is a key tool for converting detection signals into concentration values. Unstable linear response will lead to unstable calibration curves, which makes it difficult to establish an accurate concentration-signal relationship. Therefore, it is impossible to accurately convert the detection signal into sulfide concentration, which in turn affects the accuracy of the measurement;

[0089] Non-repeatability of measurement results: Due to the instability of linear response, the measurement results obtained at different time points or under different instrument conditions may be inconsistent, which reduces the repeatability and comparability of the measurement and makes it difficult to determine the true change in concentration;

[0090] Quality control issues: Unstable linear response can cause quality control issues. During the quality control process, standard samples of known concentrations are usually used to verify the performance of the instrument. Unstable linear response may result in failure to meet quality control standards, thus affecting the reliability of the test results.

[0091] Therefore, by testing the linear response of the detector when the gas chromatograph in the natural gas purification system detects the sulfide concentration, it is possible to timely discover the potential problem that the unstable linear response of the detector may cause the gas chromatograph to have a poor measurement accuracy for sulfides.

[0092] The logic of obtaining the detector linear response instability index is as follows:

[0093] S301, obtaining a plurality of signal intensities generated by a detector in a gas chromatograph during a T time period when performing sulfide concentration detection and the sulfide concentration at the corresponding signal intensities, and calibrating the signal intensities and the sulfide concentrations as ζ 信号 x and 浓度 x , x represents the number of signal intensities generated by the detector in the gas chromatograph during the time T when detecting the sulfide concentration and the sulfide concentration under the corresponding signal intensities, x=1, 2, 3, 4, ..., m, m is a positive integer;

[0094] It should be noted that the signal intensity and the corresponding sulfide concentration under the signal intensity have the same subscript, indicating the corresponding sulfide concentration under the same signal intensity. Secondly, the detector of the gas chromatograph (for example, light absorption detector, fluorescence detector, flame photometer detector, etc.) will generate signal intensity information and sulfide concentration information under the corresponding signal intensity during the analysis process. The signal intensity is usually recorded in the form of voltage or current;

[0095] S302, calculating the linear response ratio of the detector by using a plurality of signal intensities generated during the T time when the detector in the gas chromatograph detects the sulfide concentration and the sulfide concentration under the corresponding signal intensities, and the calculation expression is: 线性 x =ζ 信号 x / ζ 浓度 x , where ζ 线性 x It represents the linear response ratio of the detector;

[0096] S303, when the sulfide concentration is detected by the detector in the gas chromatograph, a plurality of detector linear response ratios ζ generated within T time 线性 x Calculate the standard deviation of the detector linear response ratio. The expression is: Wherein, ζ1 represents the standard deviation of the detector linear response ratio, ζ2 is the average value of the detector linear response ratio calculated by using several detector linear response ratios when the detector in the gas chromatograph detects sulfide concentration,

[0097] S304, calculating the detector linear response instability index, the calculation expression is: In the formula, ζ1 / ζ2 represents the variation of the linear response ratios of several detectors generated within T time when the detector in the gas chromatograph performs sulfide concentration detection. The larger the performance value of ζ1 / ζ2, the worse the stability of the linear response ratios of several detectors generated within T time when the detector in the gas chromatograph performs sulfide concentration detection. Conversely, the better the stability of the linear response ratios of several detectors generated within T time when the detector in the gas chromatograph performs sulfide concentration detection.

[0098] From the calculation expression of the detector linear response instability index, it can be seen that the larger the performance value of the detector linear response instability index generated within the T time when the gas chromatograph in the natural gas purification system performs sulfide concentration detection, the greater the hidden danger of the measurement accuracy deterioration when the gas chromatograph measures the sulfide concentration, and vice versa, the smaller the hidden danger of the measurement accuracy deterioration when the gas chromatograph measures the sulfide concentration;

[0099] The monitoring module comprehensively monitors the processed fluid dynamic parameter information and performance information when the gas chromatograph detects sulfide concentration, generates a detection evaluation coefficient, and transmits the detection evaluation coefficient to the judgment module;

[0100] The monitoring module uses the processed carrier gas flow rate drift index ψ when the gas chromatograph in the natural gas purification system detects sulfide concentration QL , Operation pressure abnormal concealment index λ YL and the detector linear response instability index ζ XX Perform a formulaic analysis to generate the detection evaluation coefficient φφ, based on the formula: Where f1, f2, and f3 are the carrier gas velocity drift index ψ QL , Operation pressure abnormal concealment index λ YL , detector linear response instability index ζ XX The preset proportional coefficient, and f1, f2, and f3 are all greater than 0;

[0101] It can be seen from the calculation formula that the greater the carrier gas flow rate drift index generated within T time when the gas chromatograph in the natural gas purification system detects sulfide concentration, the greater the operating pressure abnormal concealment index, and the greater the detector linear response instability index, that is, the greater the performance value of the detection evaluation coefficient φφ generated within T time when the gas chromatograph in the natural gas purification system detects sulfide concentration, the greater the hidden danger of measurement accuracy deterioration when the gas chromatograph measures sulfide concentration, and vice versa, the smaller the hidden danger of measurement accuracy deterioration when the gas chromatograph measures sulfide concentration;

[0102] The judgment module compares and analyzes the detection evaluation coefficient generated when the gas chromatograph performs sulfide concentration detection with a preset detection evaluation coefficient reference threshold, generates a first hidden danger signal or a second hidden danger signal, and transmits the signal to the alarm module, and issues an alarm prompt for the first hidden danger signal through the alarm module;

[0103] The judgment module compares and analyzes the detection evaluation coefficient generated by the gas chromatograph when performing sulfide concentration detection with the pre-set detection evaluation coefficient reference threshold. The results of the comparison analysis are as follows:

[0104] If the detection evaluation coefficient is greater than or equal to the detection evaluation coefficient reference threshold, a first hidden danger signal is generated through the judgment module, and the signal is transmitted to the alarm module, and an alarm prompt is issued for the first hidden danger signal through the alarm module to inform relevant operators that when the gas chromatograph generates the first hidden danger signal when performing sulfide concentration detection, it indicates that the gas chromatograph may have a hidden danger of poor measurement accuracy when measuring sulfide concentration, and it is necessary to promptly inspect and repair the gas chromatograph in advance. When abnormal hidden dangers are found in the gas chromatograph, the gas chromatograph should be maintained and managed in advance;

[0105] If the detection evaluation coefficient is less than the detection evaluation coefficient reference threshold, a second hidden danger signal is generated by the judgment module, and the signal is transmitted to the alarm module, and the alarm module does not issue an alarm prompt for the second hidden danger signal. When the gas chromatograph generates the second hidden danger signal when performing sulfide concentration detection, it indicates that the gas chromatograph has a relatively high accuracy in measuring the sulfide concentration.

[0106] It also includes a feedback module;

[0107] The feedback module analyzes several detection evaluation coefficients generated by the monitoring module during the maintenance of the gas chromatograph to ensure the successful maintenance of the gas chromatograph;

[0108] The feedback module establishes a data set for several detection evaluation coefficients generated by the monitoring module during gas chromatograph maintenance, and calibrates the data set as Z, then Z = {φφ u}, u represents the number of several detection evaluation coefficients in the data set, u = 1, 2, 3, 4, ..., s, s is a positive integer;

[0109] The detection evaluation coefficient standard deviation and the detection evaluation coefficient average value are calculated through the detection evaluation coefficient in the data set (the calculation process of the detection evaluation coefficient standard deviation and the detection evaluation coefficient average value refers to the detector linear response ratio standard deviation and the detector linear response ratio average value, which will not be described in detail here), and the generated detection evaluation coefficient standard deviation and the detection evaluation coefficient average value are respectively compared and analyzed in real time with a preset standard deviation reference threshold and a preset detection evaluation coefficient reference threshold. When the detection evaluation coefficient standard deviation is less than the standard deviation reference threshold and the detection evaluation coefficient average value is less than the detection evaluation coefficient reference threshold, a maintenance management success signal is generated through the feedback module, and the signal is transmitted to the mobile terminal, and the gas chromatograph maintenance management is successful.

[0110] The present invention monitors the process of sulfide concentration detection by the gas chromatograph, notifies relevant operators when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, and promptly inspects and repairs the gas chromatograph in advance. When the gas chromatograph is found to have abnormal hidden dangers, the gas chromatograph is maintained and managed in advance, effectively avoiding relevant operators from making decisions based on erroneous data, ensuring that potential problems are detected in time when there is a hidden danger of deterioration in the measurement accuracy of the gas chromatograph, and effectively avoiding leakage of dangerous gases or excessive emissions that endanger personnel safety and the environment;

[0111] The present invention comprehensively analyzes the real-time operating status of the gas chromatograph during maintenance, observes the maintenance status of the gas chromatograph in real time, prevents relevant maintenance personnel from maintaining the gas chromatograph based on their own experience, and causes the gas chromatograph to have abnormal hidden dangers of measurement accuracy again, thereby ensuring successful maintenance of the gas chromatograph and ensuring stable and efficient operation of the gas chromatograph.

[0112] The present invention provides Figure 2 A natural gas purification method is shown, comprising the following steps:

[0113] S1. Collect natural gas that needs to be tested for sulfide concentration, and subject the collected natural gas samples to a pretreatment step to remove interfering substances before analysis. After the treatment is completed, introduce the treated natural gas samples into a gas chromatograph for testing;

[0114] S2. Collecting multiple data information when the gas chromatograph in the natural gas purification system detects sulfide concentration, including fluid dynamics parameter information and performance information, and after collection, processing the fluid dynamics parameter information and performance information when the gas chromatograph is running;

[0115] S3, comprehensively monitoring the processed fluid dynamic parameter information and performance information when the gas chromatograph performs sulfide concentration detection, and generating a detection evaluation coefficient;

[0116] S4, comparing and analyzing the detection evaluation coefficient generated when the gas chromatograph performs sulfide concentration detection with a preset detection evaluation coefficient reference threshold, generating a first hidden danger signal or a second hidden danger signal, and issuing an alarm prompt for the first hidden danger signal;

[0117] S5. Analyze several detection evaluation coefficients generated during the maintenance of the gas chromatograph to ensure successful maintenance of the gas chromatograph;

[0118] A natural gas purification method provided in an embodiment of the present invention is implemented by the above-mentioned natural gas purification system. The specific method and process of the natural gas purification method are detailed in the embodiment of the above-mentioned natural gas purification system, which will not be repeated here.

[0119] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0120] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0121] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0122] In the several embodiments provided in the present application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0123] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0124] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0125] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which 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 natural gas purification system, characterized in that: It includes a gas collection module, a gas sample processing module, a data acquisition module, a monitoring module, a judgment module and an alarm module; A gas collection module collects natural gas that needs to be tested for sulfide concentration and transmits the collected natural gas to a gas sample processing module; The gas sample processing module is used to pre-process the collected natural gas samples to remove interfering substances before analysis. After the processing is completed, the processed natural gas samples are introduced into the gas chromatograph for detection; The data acquisition module collects a number of data information when the gas chromatograph in the natural gas purification system detects sulfide concentration, including fluid dynamics parameter information and performance information. After the data is collected, the fluid dynamics parameter information and performance information of the gas chromatograph during operation are processed and uploaded to the monitoring module; The fluid dynamic parameter information of the gas chromatograph in the natural gas purification system when detecting the sulfide concentration includes the carrier gas flow rate drift index and the operating pressure anomaly concealment index. The performance characteristics of the gas chromatograph in the natural gas purification system when detecting the sulfide concentration include the detector linear response instability index. After collection, the carrier gas flow rate drift index and the operating pressure anomaly concealment index are calibrated as and , the detector linear response instability index is calibrated as ; The logic of obtaining the carrier gas flow rate drift index is as follows: S101, obtaining the optimal carrier gas flow rate range when the gas chromatograph performs sulfide concentration detection, and calibrating the optimal carrier gas flow rate range as ; S102, obtaining the actual carrier gas flow rate at different times during the T time when the gas chromatograph performs sulfide concentration detection, and calibrating the actual carrier gas flow rate as , v It indicates the number of the actual carrier gas flow rate at different times during the T time when the gas chromatograph is detecting the sulfide concentration. v =1, 2, 3, 4, ..., w , w is a positive integer; S103, calculating the carrier gas flow rate drift index, the calculation expression is: , where It indicates the actual carrier gas flow rate that is not within the optimal carrier gas flow rate range obtained within T time when the gas chromatograph performs sulfide concentration detection. Indicates the number of the actual carrier gas flow rate that is not within the optimal carrier gas flow rate range obtained within T time when the gas chromatograph performs sulfide concentration detection. , is a positive integer, ; The logic for obtaining the operational pressure anomaly concealment index is as follows: S201, obtaining the actual operating pressure at different times during the T time when the gas chromatograph performs sulfide concentration detection, and calibrating the actual operating pressure as , y The number indicating the actual operating pressure at different times during the T time when the gas chromatograph is detecting the sulfide concentration. y =1, 2, 3, 4, ..., n , n is a positive integer; S202, calculating the operating pressure abnormal concealment index, the calculation expression is: , n It represents the total number of actual operating pressures obtained within T time when the gas chromatograph performs sulfide concentration detection; The logic of obtaining the detector linear response instability index is as follows: S301, obtaining a plurality of signal intensities generated by a detector in a gas chromatograph during a T time period when performing sulfide concentration detection and the sulfide concentration at the corresponding signal intensities, and calibrating the signal intensities and the sulfide concentrations as and , x It indicates the number of signal intensities generated by the detector in the gas chromatograph during the T time when detecting the sulfide concentration and the sulfide concentration under the corresponding signal intensities. x =1, 2, 3, 4, ..., m , m is a positive integer; S302, calculating the linear response ratio of the detector by using a plurality of signal intensities generated within T time when the detector in the gas chromatograph detects the sulfide concentration and the sulfide concentration under the corresponding signal intensities, and the calculation expression is: , where It represents the linear response ratio of the detector; S303, when the sulfide concentration is detected by the detector in the gas chromatograph, a plurality of detector linear response ratios generated within T time Calculate the standard deviation of the detector linear response ratio. The expression is: , where represents the standard deviation of the detector linear response ratio, It is the average value of the linear response ratio of the detector calculated by using several linear response ratios of the detector when the detector in the gas chromatograph detects the sulfide concentration. ; S304, calculating the detector linear response instability index, the calculation expression is: , where It indicates the variation of several detector linear response ratios generated within T time when the detector in the gas chromatograph detects sulfide concentration; The monitoring module comprehensively monitors the processed fluid dynamic parameter information and performance information when the gas chromatograph performs sulfide concentration detection, generates a detection evaluation coefficient, and transmits the detection evaluation coefficient to the judgment module; The monitoring module uses the processed carrier gas flow rate drift index when the gas chromatograph in the natural gas purification system detects sulfide concentration. , Operation pressure abnormal concealment index and the detector linear response instability index Perform formula analysis to generate detection evaluation coefficients , based on the formula: ; In the formula, , , Carrier gas velocity drift index , Operation pressure abnormal concealment index , detector linear response instability index The preset scaling factor of , , All are greater than 0; The judgment module compares and analyzes the detection evaluation coefficient generated by the gas chromatograph when performing sulfide concentration detection with a preset detection evaluation coefficient reference threshold, generates a first hidden danger signal or a second hidden danger signal, and transmits the signal to the alarm module, which issues an alarm prompt for the first hidden danger signal through the alarm module.

2. A natural gas purification system according to claim 1, characterized in that: The judgment module compares and analyzes the detection evaluation coefficient generated by the gas chromatograph when performing sulfide concentration detection with the pre-set detection evaluation coefficient reference threshold. The results of the comparison analysis are as follows: If the detection evaluation coefficient is greater than or equal to the detection evaluation coefficient reference threshold, a first hidden danger signal is generated by the judgment module, and the signal is transmitted to the alarm module, and an alarm prompt is issued for the first hidden danger signal by the alarm module to inform relevant operators; If the detection evaluation coefficient is less than the detection evaluation coefficient reference threshold, a second hidden danger signal is generated by the judgment module and the signal is transmitted to the alarm module, and an alarm prompt is not issued for the second hidden danger signal through the alarm module.

3. A natural gas purification system according to claim 1, characterized in that: It also includes a feedback module; The feedback module analyzes several detection evaluation coefficients generated by the monitoring module during the maintenance of the gas chromatograph to ensure the successful maintenance of the gas chromatograph; The feedback module establishes a data set for several detection evaluation coefficients generated by the monitoring module during gas chromatograph maintenance, and calibrates the data set as Z ,but , u Indicates the number of detection evaluation coefficients in the data set, u =1, 2, 3, 4, ..., s , s is a positive integer; The detection evaluation coefficient standard deviation and the detection evaluation coefficient average value are calculated through the detection evaluation coefficient in the data set, and the generated detection evaluation coefficient standard deviation and the detection evaluation coefficient average value are respectively compared and analyzed with the pre-set standard deviation reference threshold and the pre-set detection evaluation coefficient reference threshold in real time. When the detection evaluation coefficient standard deviation is less than the standard deviation reference threshold and the detection evaluation coefficient average value is less than the detection evaluation coefficient reference threshold, a maintenance management success signal is generated through the feedback module and the signal is transmitted to the mobile terminal, prompting the gas chromatograph maintenance management success through the mobile terminal.

4. A natural gas purification method, implemented by a natural gas purification system according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Collect natural gas that needs to be tested for sulfide concentration, and subject the collected natural gas samples to a pretreatment step to remove interfering substances before analysis. After the treatment is completed, introduce the treated natural gas samples into a gas chromatograph for testing; S2. Collecting multiple data information when the gas chromatograph in the natural gas purification system detects sulfide concentration, including fluid dynamics parameter information and performance information, and after collection, processing the fluid dynamics parameter information and performance information when the gas chromatograph is running; S3, comprehensively monitoring the processed fluid dynamic parameter information and performance information when the gas chromatograph performs sulfide concentration detection, and generating a detection evaluation coefficient; S4, comparing and analyzing the detection evaluation coefficient generated when the gas chromatograph performs sulfide concentration detection with a preset detection evaluation coefficient reference threshold, generating a first hidden danger signal or a second hidden danger signal, and issuing an alarm prompt for the first hidden danger signal; S5. Analyze several detection evaluation coefficients generated during gas chromatograph maintenance to ensure successful maintenance of the gas chromatograph.

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