A natural gas sampling and component analysis system

Abstract

The present invention relates to the technical field of natural gas analysis, and specifically discloses a natural gas sampling and component analysis system. The system first matches the environmental data corresponding to the natural gas sampling by setting an environmental data matching module, a sampling inspection module, a quality stability index evaluation module and an analysis quality index determination module, so as to ensure that the acquired samples are more accurate and reliable, and arranges a natural gas transmission pipeline for several sampling arrangements according to a preset sampling arrangement mode. The natural gas belonging to the sampling transmission pipeline is sampled and transferred for inspection according to the environmental data corresponding to the natural gas sampling, and the quality stability index of the natural gas in the transfer inspection period is determined, so as to ensure that the quality of the natural gas in the transfer inspection process meets the standards, which is helpful to timely discover and deal with potential safety hazards in the transfer inspection process, ensure transportation safety, and determine the analysis quality index of the component analysis equipment, so as to provide feedback on the natural gas sampling and component analysis.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas analysis, in particular to a natural gas sampling and component analysis system. Background Art

[0002] At present, natural gas is a clean and efficient energy source with the advantages of complete combustion, high unit calorific value, and low environmental impact of combustion products. Therefore, its proportion in the global energy structure is increasing. Before using natural gas, its quality needs to be strictly monitored to ensure that it meets relevant standards and regulations. Natural gas component analysis is one of the important links in natural gas detection. The main components are saturated hydrocarbons (hydrocarbon compounds), among which methane has the highest content, usually accounting for 70%~90%. Through detailed analysis of natural gas components, we can fully understand its chemical composition and property characteristics.

[0003] For example, the invention patent with the announcement number CN104764795B relates to a method for analyzing liquefied natural gas, which includes the following steps: (1) gasifying the liquefied natural gas sample to obtain a gaseous sample; (2) measuring the relative contents of methane, helium, oxygen, hydrogen sulfide, carbonyl sulfide and sulfur dioxide components of the gaseous sample by mass spectrometry; (3) measuring the relative contents of hydrogen, helium, nitrogen, oxygen and argon components of the gaseous sample by mass spectrometry; (4) measuring the relative contents of methane, ethane, The relative contents of ethylene, propane, isobutane, normal butane, neopentane, isopentane and normal pentane components; ⑸ The relative contents of isopentane + normal pentane, hexane, methylcyclopentane, benzene, cyclohexane, heptane, methylcyclohexane, toluene and octane components obtained by gas chromatography; ⑹ The relative content of carbon dioxide component obtained by gas chromatography; ⑺ Merge data; ⑻ Normalize data; ⑼ Calculate gas density, calorific value and gasification rate; ⑽ Calculate liquid density.

[0004] For example, the invention patent with announcement number CN103472156B announces a raw natural gas sampling and component analysis system, in which a sampling probe is provided at one end of the sampling pipeline, and the sampling probe is connected to the incoming pipeline; the other end of the sampling pipeline is connected to the pre-stage treatment device, and the obtained raw natural gas sample is sent to the pre-stage treatment device for insulation and decompression, and the heating pipe is connected between the pre-stage treatment device and the pre-treatment device, and the raw natural gas sample after insulation and decompression by the pre-stage treatment device is sent to the pre-treatment device for pretreatment, and the raw natural gas sample after pretreatment enters the first gas chromatograph for measuring N2 and C6+ components and the second gas chromatograph for measuring high-range sulfur compounds and high-range CO2 components for analysis, thereby obtaining the content of each component in the raw natural gas sample.

[0005] Combining the above technical solutions, it is found that with the importance and wide application of natural gas, more efficient, convenient and accurate technical solutions for natural gas sampling and component analysis are needed. However, most of the technical solutions for natural gas sampling and component analysis, on the one hand, sample natural gas according to a fixed sampling method, which will lead to deviations in the subsequent component analysis results. On the other hand, they pay little attention to the analysis quality of the analysis equipment. If the analysis quality of the equipment declines, it will affect the accuracy of the analysis results. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a natural gas sampling and component analysis system, which can effectively solve the problems involved in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a natural gas sampling and component analysis system, including an environmental data matching module, which is used to obtain natural gas sampling historical data and establish a comprehensive evaluation index for natural gas sampling, so as to match the environmental data corresponding to the natural gas sampling; a sampling and inspection module, which is used to perform a number of sampling layouts on the natural gas transmission pipeline according to a preset sampling layout method, and randomly extract a certain sampling layout transmission pipeline, which is recorded as a sampling transmission pipeline, thereby sampling the natural gas belonging to the sampling transmission pipeline through the environmental data corresponding to the natural gas sampling and transferring it for inspection; a quality stability index evaluation module, which is used to obtain the natural gas quality information of the cylinder device to which the transfer and inspection belongs, determine the quality stability index of the natural gas in the transfer and inspection period, and compare it with the predefined quality stability preset value. If the quality stability index of the natural gas in the transfer and inspection period is greater than the quality stability preset value, the natural gas in the cylinder device is subjected to component analysis; an analysis quality index determination module, which is used to obtain the operating status data of the component analysis equipment, and determine the analysis quality index of the component analysis equipment in combination with the quality stability index of the natural gas in the transfer and inspection period, so as to provide feedback on the natural gas sampling and component analysis.

[0008] As a further solution, the comprehensive evaluation index of natural gas sampling is established, and the specific establishment process is: the natural gas sampling historical data specifically includes the historical average flow rate of the natural gas medium, the historical average temperature of the natural gas pipeline, and the historical average density of the natural gas medium; the historical adaptation flow rate, historical adaptation temperature and historical reference density are extracted from the natural gas analysis information library; based on the natural gas sampling historical data, the comprehensive evaluation index of natural gas sampling is comprehensively established.

[0009] As a further solution, the preset sampling layout method is specifically to arrange the sampling according to the preset pipeline depth, pipeline length and pipeline natural gas flow direction.

[0010] As a further solution, the natural gas quality information of the cylinder device to which the transfer for inspection belongs specifically includes the methane content of the natural gas at the start time of the transfer for inspection, the methane content of the natural gas at the end time of the transfer for inspection, the medium density of the natural gas medium at the end time of the transfer for inspection, and the internal average temperature and average pressure value of the cylinder device during the transfer for inspection period.

[0011] As a further solution, the quality stability index of natural gas during the transfer inspection period is determined by: extracting the medium reference density from the natural gas analysis information database; comprehensively determining the quality stability index of natural gas during the transfer inspection period according to the natural gas quality information of the cylinder device to which the transfer inspection belongs, and the specific method is as follows:

[0012]

[0013] In the formula, It is the quality stability index of natural gas during the transfer and inspection period. is the methane content of natural gas at the time when the transfer and inspection begins. is the methane content of natural gas at the end of transfer and inspection, is the medium density of the natural gas medium at the end of the transfer and inspection time, is the medium reference density, is the average internal temperature of the cylinder device during the transfer and inspection period. is the ambient temperature corresponding to natural gas sampling, is the average pressure value of the cylinder device during the transfer and inspection period. is the ambient pressure value corresponding to natural gas sampling, is the impact factor corresponding to the unit value of methane deviation content predefined in the natural gas analysis information database, is the influencing factor corresponding to the unit value of the internal and external temperature deviation value predefined in the natural gas analysis information database, It is the influencing factor corresponding to the unit value of the internal and external pressure deviation value predefined in the natural gas analysis information database, and e is a natural constant.

[0014] As a further solution, the quality stability index of the natural gas during the transfer and inspection period is compared with a predefined quality stability preset value. The specific comparison process is: if the comparison result shows that the quality stability index of the natural gas during the transfer and inspection period is greater than the quality stability preset value, the natural gas in the cylinder device is subjected to component analysis; if the comparison result shows that the quality stability index of the natural gas during the transfer and inspection period is equal to or less than the quality stability preset value, the acquisition of natural gas sampling historical data is added, and the environmental data corresponding to the natural gas sampling is matched again, so that the natural gas in the cylinder device can finally be subjected to component analysis.

[0015] As a further solution, the analysis quality index of the component analysis equipment is determined by the following specific process: extracting suitable environmental humidity and vibration limit frequency from a natural gas analysis information database; comprehensively determining the analysis quality index of the component analysis equipment based on the operating status data of the component analysis equipment and in combination with the quality stability index of the natural gas during the transfer and inspection period.

[0016] As a further solution, the feedback on natural gas sampling and component analysis is carried out, and the specific feedback process is: comparing the analysis quality index of the component analysis equipment with the predefined analysis quality preset index; if the analysis quality index of the component analysis equipment is greater than the analysis quality preset index, quality feedback is carried out on the natural gas sampling and component analysis; if the analysis quality index of the component analysis equipment is equal to or less than the analysis quality preset index, an early warning is issued on the operating status of the component analysis equipment.

[0017] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0018] (1) The present invention provides a natural gas sampling and component analysis system. First, the environmental data corresponding to the natural gas sampling is matched. Considering these environmental factors, the sampling method and equipment can be adjusted to ensure that the samples obtained are more accurate and reliable. The natural gas transmission pipeline is arranged in a number of sampling arrangements according to a preset sampling arrangement. The natural gas belonging to the sampling transmission pipeline is sampled and transferred for inspection based on the environmental data corresponding to the natural gas sampling. The quality stability index of the natural gas during the transfer and inspection period is determined to ensure that the quality of the natural gas during the transfer and inspection process meets the standards, which helps to timely discover and deal with potential safety hazards in the transfer and inspection process, ensure transportation safety, and determine the analysis quality index of the component analysis equipment, so as to provide feedback on the natural gas sampling and component analysis, thereby improving the utilization efficiency of natural gas and reducing energy consumption.

[0019] (2) The present invention arranges a number of sampling arrangements on the natural gas transmission pipeline according to a preset sampling arrangement, and randomly extracts a certain sampling arrangement transmission pipeline, which is recorded as the sampling transmission pipeline. The natural gas belonging to the sampling transmission pipeline is sampled and transferred for inspection. Through the scientific preset sampling arrangement, it can be ensured that sampling is carried out at different locations and different time periods of the natural gas transmission pipeline, so as to fully reflect the overall quality status of the natural gas. This method avoids the uncertainty of random sampling and improves the accuracy and representativeness of sampling.

[0020] (3) The present invention obtains the operating status data of the component analysis equipment and determines the analysis quality index of the component analysis equipment. By performing real-time analysis on the operating status data of the component analysis equipment, changes in equipment performance can be discovered in a timely manner, thereby ensuring the accuracy and reliability of the analysis results. Potential signs of failure of the component analysis equipment can also be discovered in a timely manner, thereby taking preventive measures to avoid downtime and production interruption caused by equipment failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0022] Figure 1 It is a schematic diagram of system module connection of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 As shown, an embodiment of the present invention provides a technical solution: a natural gas sampling and component analysis system, including an environmental data matching module, a sampling inspection module, a quality stability index evaluation module and an analysis quality index determination module.

[0025] An embodiment of the present invention provides a technical solution: a natural gas sampling and component analysis system, which also includes: a natural gas analysis information library for storing historical adaptation flow rate, historical adaptation temperature, historical reference density, medium reference density, environmental suitable humidity, vibration limit frequency and preset values ​​of various factors.

[0026] The environmental data matching module is connected to the sampling and inspection module, the sampling and inspection module is connected to the quality stability index evaluation module, the quality stability index evaluation module is connected to the analysis quality index determination module, and the environmental data matching module, the quality stability index evaluation module and the analysis quality index determination module are all connected to the natural gas analysis information library.

[0027] The environmental data matching module is used to obtain historical data of natural gas sampling and establish a comprehensive evaluation index of natural gas sampling, so as to match the environmental data corresponding to the natural gas sampling.

[0028] Specifically, the comprehensive evaluation index of natural gas sampling is established, and the specific establishment process is as follows:

[0029] The natural gas sampling historical data specifically includes the historical average flow velocity of the natural gas medium, the historical average temperature of the natural gas pipeline, and the historical average density of the natural gas medium.

[0030] The above-mentioned natural gas medium specifically refers to the gaseous form of natural gas.

[0031] The above natural gas sampling historical data can be extracted from the natural gas analysis information database, wherein the historical data is partial sampling historical data.

[0032] The historical adaptation flow rate, historical adaptation temperature and historical reference density are extracted from the natural gas analysis information database.

[0033] Based on the historical data of natural gas sampling, the comprehensive evaluation index of natural gas sampling is established. The specific method is as follows:

[0034]

[0035] In the formula, It is a comprehensive evaluation index for natural gas sampling. In this embodiment, it is used to comprehensively evaluate multiple aspects that may be involved in the sampling process, such as the comprehensive performance of the natural gas medium state, sampling conditions, and sampling equipment.

[0036] The historical average flow rate of natural gas medium refers to the average speed of natural gas flowing in the pipeline during the period covered by historical data acquisition.

[0037] The historical adaptation flow rate refers to the reference value of the allowable flow rate of the natural gas medium under historical conditions.

[0038] The historical average temperature of the natural gas pipeline refers to the average temperature in the natural gas pipeline during the period covered by the historical data acquisition.

[0039] The historical adaptation temperature refers to the reference value of the allowable temperature of the natural gas pipeline under historical conditions.

[0040] It is the historical average density of natural gas medium, which refers to the average density of natural gas flowing in the pipeline during the period covered by historical data acquisition.

[0041] The historical reference density refers to the reference value of the allowable flow density of the natural gas medium under historical conditions.

[0042] is the weight factor corresponding to the historical average flow rate predefined in the natural gas analysis information database, is the weight factor corresponding to the historical average temperature predefined in the natural gas analysis information database, is the weight factor corresponding to the historical average density predefined in the natural gas analysis information database, and e is a natural constant.

[0043] In a specific embodiment, when used, the weight factor corresponding to the historical average flow rate, the weight factor corresponding to the historical average temperature, and the weight factor corresponding to the historical average density can be directly obtained from the natural gas analysis information library, which represents the numerical value of the influence of the historical average flow rate, the historical average temperature, and the historical average density on the comprehensive evaluation index of natural gas sampling during the comprehensive evaluation of natural gas sampling. The corresponding relationship can be a pre-set mapping relationship. For example, the historical average flow rate and the weight factor corresponding to the historical average flow rate preset in the natural gas analysis information library form a mapping set, and the real-time historical average flow rate is brought into the mapping set to obtain the weight factor corresponding to the historical average flow rate. The mapping relationship can be one-to-one or many-to-one. The relationship between the historical average temperature and the weight factor corresponding to the historical average temperature preset in the natural gas analysis information library forms a mapping set, and the real-time historical average temperature is substituted into the mapping set to obtain the weight factor corresponding to the historical average temperature. The mapping relationship can be a one-to-one correspondence or a many-to-one relationship. In this embodiment, the value range is [0, 1], the historical average density and the weight factor corresponding to the historical average density preset in the natural gas analysis information library form a mapping set. The real-time historical average density is substituted into the mapping set to obtain the weight factor corresponding to the historical average density. The mapping relationship can be a one-to-one correspondence or a many-to-one relationship. In this embodiment, the value range is [0, 1].

[0044] In this embodiment, firstly, the average flow rate of the natural gas medium is closely related to the pipeline pressure and the natural gas density factors. These factors need to be comprehensively considered to determine the appropriate flow rate to ensure the safe and efficient transportation of natural gas. Generally speaking, the maximum flow rate of the natural gas pipeline cannot be too high to avoid the safety hazards and wear problems caused by the excessively high flow rate. At the same time, the minimum flow rate also needs to be considered. Too low a flow rate will cause gas stagnation and accumulation, increasing the risk of corrosion in the pipeline. That is, when the average flow rate of the natural gas medium is closer to the adapted flow rate, the higher the comprehensive evaluation index of the natural gas sampling. Secondly, the average temperature of the natural gas pipeline has an important influence on the density of natural gas. As the temperature increases, the thermal motion of the natural gas molecules becomes more intense, and the distance between the molecules becomes larger, thereby reducing the gas density. Finally, the average density of the natural gas medium is also related to the flow rate, temperature and pressure. Under the same pressure and temperature, the greater the density of the natural gas, the smaller its flow rate is usually. This is because the interaction force between gas molecules with higher density is stronger, and more energy is required to make them flow. At the same time, changes in temperature will also affect the density of the natural gas, thereby affecting its flow rate. In summary, there is a complex relationship between the average flow rate of the natural gas medium, the average temperature of the natural gas pipeline and the average density of the natural gas medium. These factors need to be considered during natural gas sampling and comprehensive evaluation to ensure the safe and efficient use of natural gas.

[0045] Furthermore, the environmental data corresponding to the natural gas sampling is matched, and the specific matching process is as follows:

[0046] The comprehensive evaluation index of natural gas sampling is matched with the environmental data corresponding to each comprehensive evaluation index interval predefined in the natural gas analysis information library, so as to obtain the environmental data corresponding to the natural gas sampling.

[0047] The environmental data corresponding to the natural gas sampling specifically includes the environmental temperature corresponding to the natural gas sampling and the environmental pressure value corresponding to the natural gas sampling.

[0048] The specific matching process of the environmental data corresponding to the above-mentioned natural gas sampling is: obtain the mapping set of the natural gas sampling comprehensive evaluation index and the ambient temperature and the mapping set with the ambient pressure value from the natural gas analysis information library, first determine the interval to which the natural gas sampling comprehensive evaluation index belongs, and assign the ambient temperature and ambient pressure values ​​corresponding to the interval to the natural gas sampling process corresponding to the comprehensive evaluation index, and obtain the ambient temperature and ambient pressure values ​​corresponding to the natural gas sampling.

[0049] The above-mentioned comprehensive evaluation index of natural gas sampling is a complex evaluation process, which takes into account multiple parameters of natural gas, such as flow, temperature, pressure, etc., as well as the relationship between these parameters and the environment. This index can comprehensively evaluate natural gas sampling through a specific algorithm or formula. In the comprehensive evaluation index, a series of comprehensive evaluation data intervals are pre-defined, which may be based on historical data, industry standards or expert experience. Each interval is associated with specific environmental data (such as ambient temperature, ambient pressure, etc.). When the natural gas sampling data is input into the formula of the comprehensive evaluation index, the formula will calculate the position of the sampling in the comprehensive evaluation according to the predetermined algorithm. Then, by finding the comprehensive evaluation data interval corresponding to this position, the environmental data corresponding to the natural gas sampling can be obtained.

[0050] In the process of natural gas production and transportation, ambient temperature and ambient pressure are important factors that affect the properties and behavior of natural gas. Therefore, in the subsequent transportation, these two factors are usually used as important reference indicators. Compared with other environmental factors (such as wind speed, humidity, etc.), ambient temperature and ambient pressure are easier to monitor and record in real time during the production and transportation of natural gas. Therefore, the data of these two factors are easier to obtain and use in the comprehensive evaluation indicators.

[0051] The sampling and inspection module is used to carry out several sampling layouts of the natural gas transmission pipeline according to a preset sampling layout, and randomly extract a certain sampling layout transmission pipeline, recorded as the sampling transmission pipeline, thereby sampling the natural gas belonging to the sampling transmission pipeline through the environmental data corresponding to the natural gas sampling and transferring it for inspection.

[0052] The above-mentioned preset sampling arrangement is predefined in the natural gas analysis information library.

[0053] Natural gas sampling as described above refers to the safe collection of natural gas samples from process pipelines or storage equipment during storage or transportation, while maintaining the chemical composition for later analysis.

[0054] The above-mentioned transfer and inspection specifically refers to sampling the natural gas belonging to the sampling transmission pipeline through a sampling cylinder, and transferring the natural gas sample cylinder to the laboratory for natural gas composition analysis.

[0055] In the process of sampling and layout of natural gas transmission pipelines, scientific layout principles and methods need to be followed. For example, a sampling layout plan should be formulated based on the length, diameter, material, transmission pressure, temperature and other parameters of the pipeline, as well as the composition, flow rate and other characteristics of natural gas. The sampling layout should cover different areas and conditions of the pipeline to ensure the comprehensiveness and representativeness of the sampling. When randomly sampling the transmission pipeline, the fairness and randomness of the sampling process should be ensured. Random number generators, drawing lots and other methods can be used for sampling to avoid human intervention and selection bias. At the same time, the sampling process and methods should be recorded for subsequent verification and review. The representativeness of the sampling results can be verified by comparing the natural gas composition, flow rate and other parameters at different sampling points, and analyzing the operating status and conditions of the pipeline. If it is found that there are significant differences in key parameters between the extracted pipeline and the overall pipeline, it may be necessary to re-sample and re-layout.

[0056] It should be explained that the sampling and inspection process requires human, material and financial resources. If sampling and inspection are carried out at each sampling point, the cost will be greatly increased. Therefore, under the premise of ensuring the representativeness of sampling, reasonably controlling the number of samples is an effective way to reduce costs. In the sampling process of natural gas transmission pipelines, samples need to be obtained and inspected quickly and accurately. If multiple sampling points are selected for inspection, the time and workload of sampling and inspection will be increased, and the sampling efficiency will be reduced. In statistical analysis, if the sample size is large enough and representative, the test results of a single sample can also reflect the overall situation to a certain extent. Therefore, under the premise of scientific and reasonable sampling layout and fairness of random sampling, it is also feasible to select a representative sampling point for inspection.

[0057] Specifically, the preset sampling layout method is to arrange the sampling according to the preset pipeline depth, pipeline length and pipeline natural gas flow direction.

[0058] The above sampling arrangement process is specifically as follows:

[0059] 1) Determine the preset parameters:

[0060] Pipeline depth: Determine the vertical position of the sampling point based on the buried depth of the natural gas pipeline. This usually requires consideration of factors such as soil conditions, groundwater level, and safe distance of the pipeline.

[0061] Pipeline length: Determine the number and location of sampling points along the direction of the natural gas pipeline based on the total length and distribution characteristics of the pipeline. This helps to fully evaluate the flow status of the natural gas in the pipeline.

[0062] Natural gas flow direction: Knowing the flow direction of natural gas is crucial for sampling layout. This can be achieved by consulting pipeline design drawings, on-site observations, or using advanced detection equipment.

[0063] 2) Sampling point layout:

[0064] Point selection: Select appropriate sampling points based on the preset pipeline depth, length and flow direction. These points should be able to represent natural gas samples at different locations and flow rates in the pipeline.

[0065] Layout method: Use appropriate layout methods, such as plum blossom layout method, cross-interval layout method, etc., to ensure that the distribution of sampling points is uniform and representative.

[0066] 3) Sampling operation

[0067] Sampling tool: Select an appropriate sampling tool. In this embodiment, a sampling cylinder is used to ensure that the sample will not be contaminated during the sampling process.

[0068] Sampling steps: Follow the prescribed sampling steps, including opening the ball valves at both ends of the sampling cylinder to collect samples, then closing the ball valves and taking the cylinder to the laboratory for component analysis. At the same time, record key information such as sampling time, location, and environmental conditions.

[0069] The quality stability index evaluation module is used to obtain the natural gas quality information of the cylinder device to which the transfer and inspection belongs, determine the quality stability index of the natural gas during the transfer and inspection period, and compare it with the predefined quality stability preset value. If the quality stability index of the natural gas during the transfer and inspection period is greater than the quality stability preset value, the natural gas in the cylinder device will be subjected to component analysis.

[0070] Furthermore, the natural gas quality information of the cylinder device to which the transfer for inspection belongs specifically includes the methane content of the natural gas at the start time of the transfer for inspection, the methane content of the natural gas at the end time of the transfer for inspection, the medium density of the natural gas medium at the end time of the transfer for inspection, and the internal average temperature value and average pressure value of the cylinder device during the transfer for inspection period.

[0071] It needs to be explained that the transfer and inspection start time point and the transfer and inspection end time point are the starting time point and the ending time point of the transfer and inspection time point, wherein the transfer and inspection time point is specifically divided into various transfer and inspection time points by the transfer and inspection time period, wherein the transfer and inspection time period is determined from the completion of natural gas sampling and preparation to be taken to the laboratory to the time when it has been taken to the laboratory as the transfer and inspection time period.

[0072] The material of the above-mentioned cylinder device is 304L stainless steel, the pressure resistance value is 1800 psi (pounds force per square inch), and it meets the TPTC 010 certification.

[0073] Among them, 304L stainless steel is a low-carbon stainless steel with excellent corrosion resistance, especially after welding or stress relief, its resistance to intergranular corrosion is excellent. In addition, 304L stainless steel also has good processing and welding properties, suitable for various occasions that require corrosion resistance and a certain strength.

[0074] The pressure rating refers to the maximum internal pressure that a cylinder can withstand. For the sampling cylinder in this example, its pressure rating is 1800 psi (pounds force per square inch), which means that under normal use conditions, the pressure inside the cylinder should not exceed 1800 psi to ensure its safety and reliability.

[0075] TP TC 010 is a certification standard developed by Russia for specific products (such as sandblasting machines, etc.). This standard is designed to ensure that the design, manufacture and use of products comply with relevant Russian laws, regulations and safety requirements.

[0076] The above-mentioned methane content can be detected by the semiconductor sensor belonging to the sampling device, the medium density can be detected by the density sensor belonging to the sampling device, and the internal average temperature value and the average pressure value can be measured by the temperature gauge and pressure gauge belonging to the cylinder device.

[0077] Specifically, the quality stability index of natural gas during the transfer and inspection period is determined by the following process:

[0078] The medium reference density is extracted from the natural gas analysis information database.

[0079] According to the natural gas quality information of the cylinder device to which the transfer is sent for inspection, the quality stability index of the natural gas during the transfer inspection period is comprehensively determined. The specific method is as follows:

[0080]

[0081] In the formula, It is a quality stability index of natural gas during the period of transfer and inspection. In this embodiment, it mainly refers to a series of quantitative indicators that the key quality parameters of natural gas remain relatively stable and do not fluctuate significantly during the transfer and inspection process.

[0082] It is the methane content of natural gas at the start time of transfer for inspection, which refers to the percentage of methane component in the total volume of natural gas sample measured at the start time of transfer during the inspection process.

[0083] It refers to the methane content of natural gas at the end of transfer and inspection, which refers to the percentage of methane components in the total volume of the natural gas sample measured at the end of transfer during the inspection process.

[0084] It is the medium density of the natural gas medium at the end time of transfer and inspection, which is related to the expression of the above-mentioned historical average density of the natural gas medium, and refers to the average density of the natural gas flowing in the cylinder at the end time of transfer.

[0085] The medium reference density refers to the standard value of the medium density used as a reference when discussing the medium density.

[0086] It is the average internal temperature value of the cylinder device during the transfer and inspection period, which refers to the average temperature reached by the internal space of the cylinder during the inspection process.

[0087] The ambient temperature corresponding to natural gas sampling.

[0088] It is the average pressure value of the cylinder device during the transfer and inspection period, which refers to the average pressure reached in the internal space of the cylinder during the inspection process.

[0089] It is the ambient pressure value corresponding to natural gas sampling.

[0090] is the impact factor corresponding to the unit value of methane deviation content predefined in the natural gas analysis information database, is the influencing factor corresponding to the unit value of the internal and external temperature deviation value predefined in the natural gas analysis information database, It is the influencing factor corresponding to the unit value of the internal and external pressure deviation value predefined in the natural gas analysis information database, and e is a natural constant.

[0091] In a specific embodiment, when used, the influencing factors corresponding to the unit values ​​of the methane deviation content, the influencing factors corresponding to the unit values ​​of the internal and external temperature deviation values, and the influencing factors corresponding to the unit values ​​of the internal and external pressure deviation values ​​can be directly obtained from the natural gas analysis information library, which represent the numerical values ​​of the influence of the methane deviation content, the internal and external temperature deviation values, and the internal and external pressure deviation values ​​on the quality stability index of the natural gas during the transfer and inspection period in the process of natural gas quality stability determination. The corresponding relationship can be a pre-set mapping relationship. For example, the methane deviation content and the influencing factors corresponding to the unit values ​​of the methane deviation content preset in the natural gas analysis information library form a mapping set, and the real-time methane deviation content is brought into the mapping set to obtain the influencing factors corresponding to the unit values ​​of the methane deviation content. The mapping relationship can be one-to-one or A mapping set is formed by the internal and external temperature deviation values ​​and the influence factors corresponding to the internal and external temperature deviation value unit values ​​preset in the natural gas analysis information library. The real-time internal and external temperature deviation values ​​are substituted into the mapping set to obtain the influence factors corresponding to the internal and external temperature deviation value unit values. The mapping relationship can be a one-to-one correspondence or a many-to-one relationship. In this embodiment, the mapping range is [0, 1]. The internal and external pressure deviation values ​​and the influence factors corresponding to the internal and external pressure deviation value unit values ​​preset in the natural gas analysis information library form a mapping set. The real-time internal and external pressure deviation values ​​are substituted into the mapping set to obtain the influence factors corresponding to the internal and external pressure deviation value unit values. The mapping relationship can be a one-to-one correspondence or a many-to-one relationship. In this embodiment, the mapping range is [0, 1].

[0092] In this embodiment, at the start time of transfer inspection, the methane content may represent the concentration of natural gas in its original state. If the internal average temperature value of the cylinder device during the transfer inspection period differs too much from the ambient temperature corresponding to the natural gas sampling, the movement speed of the natural gas methane molecules in the cylinder will be affected by the temperature. At high temperature, the movement of methane molecules is more intense, which may cause some methane molecules to escape from the cylinder, thereby affecting the measurement result of the methane content at the end time of the natural gas transfer inspection. Similarly, when the average pressure value of the cylinder device during the transfer inspection period differs too much from the ambient pressure value corresponding to the natural gas sampling, if the pressure increases, the natural gas will be compressed, the volume will decrease, and the density will increase; conversely, if the pressure decreases, the natural gas will expand, the volume will increase, and the density will decrease. Changes in temperature and pressure will affect the solubility, adsorption state and thermal motion of methane molecules, thereby affecting the methane content; therefore, in the process of natural gas transfer inspection, it is necessary to strictly control temperature, pressure and other conditions to reduce measurement errors and ensure the accuracy of parameters such as methane content and medium density.

[0093] Furthermore, the quality stability index of the natural gas during the transfer inspection period is compared with a predefined quality stability preset value. The specific comparison process is as follows:

[0094] If the comparison result shows that the quality stability index of natural gas during the transfer and inspection period is greater than the quality stability preset value predefined in the natural gas analysis information library, the natural gas in the cylinder device is subjected to component analysis; if the comparison result shows that the quality stability index of natural gas during the transfer and inspection period is equal to or less than the quality stability preset value, the acquisition of natural gas sampling historical data is increased, and the environmental data corresponding to the natural gas sampling is matched again, so that the natural gas in the cylinder device can finally be subjected to component analysis.

[0095] The above-mentioned increase in the acquisition of historical data on natural gas sampling specifically increases the time period for acquiring historical data on natural gas sampling, and obtains the flow rate of each natural gas medium, the temperature of each natural gas pipeline and the density of each natural gas medium during multiple historical natural gas sampling processes and performs average processing to obtain a more accurate corresponding average, so that the environmental data corresponding to the matched natural gas sampling is more accurate, thereby improving the quality stability index of natural gas.

[0096] If the quality stability index of the above natural gas during the transfer and inspection period is equal to or less than the preset quality stability value, it indicates that the quality stability of the current batch of natural gas may have problems or need further verification. By increasing the acquisition of natural gas sampling history data and matching the environmental data corresponding to natural gas sampling (such as temperature, pressure, etc.), external factors that may affect the quality stability of natural gas can be analyzed. Based on the matching results of the above historical data and environmental data, a more in-depth component analysis of the natural gas in the cylinder device can be performed. Component analysis helps to reveal the content of each component in natural gas and its changing trend, so as to more accurately evaluate the quality stability of natural gas.

[0097] Through the adjustment of the above process, especially the addition of historical data acquisition and component analysis, we can have a more comprehensive understanding of the quality status and changing trends of natural gas. After obtaining more abundant data and information, operators can more specifically adjust the parameters in the production, storage or transportation process to improve the quality stability of natural gas.

[0098] The analysis quality index determination module is used to obtain the operating status data of the component analysis equipment and determine the analysis quality index of the component analysis equipment, thereby providing feedback on natural gas sampling and component analysis.

[0099] Specifically, the operating status data of the component analysis device includes an average vibration frequency of the component analysis device during an analysis cycle, a maximum humidity of the environment of the area to which the component analysis device belongs, and a duration required for each analysis of the component analysis device during the analysis cycle.

[0100] The operating status data of the above-mentioned component analysis equipment can be extracted from the operating report of the component analysis equipment.

[0101] Furthermore, the specific determination process of determining the analysis quality index of the component analysis equipment is as follows:

[0102] The suitable environmental humidity and vibration limit frequency are extracted from the natural gas analysis information database.

[0103] According to the running status data of the component analysis equipment, the analysis quality index of the component analysis equipment is comprehensively determined. The specific method is as follows:

[0104]

[0105] In the formula, It is the analysis quality index of the component analysis equipment, which is used in this embodiment to measure the comprehensive index of the accuracy and reliability of the equipment when analyzing products.

[0106] It is the quality stability index of natural gas during the transfer and inspection period, which is obtained by comprehensive analysis of the methane content of natural gas at the start time of transfer and inspection, the methane content of natural gas at the end time of transfer and inspection, the medium density of natural gas medium at the end time of transfer and inspection, the internal average temperature value of the cylinder device during the transfer and inspection period, and the average pressure value.

[0107] It is the time required for the component analysis equipment to perform the i-th analysis within the analysis cycle, which refers to the time it takes for the component analysis equipment to run each time and give the analysis results within the analysis cycle.

[0108] i is the number of each analysis, i=1,2,3,…,m, where m is the total number of analyses.

[0109] It is the maximum humidity of the environment of the component analysis equipment during the analysis period, which refers to the maximum humidity value allowed in the environment where the equipment is located during the analysis period.

[0110] Suitable environmental humidity refers to the standard value of environmental humidity.

[0111] The average vibration frequency of the component analysis equipment during the analysis cycle refers to the average number of vibrations of the component analysis equipment during the analysis cycle. It reflects the speed of the vibration of the equipment during this period of time, usually expressed in Hertz (Hz).

[0112] The frequency defined for vibration refers to the maximum value of the vibration frequency within a reasonable range.

[0113] It is the impact factor corresponding to the unit value of the quality stability index predefined in the natural gas analysis information database.

[0114] In a specific embodiment, the influence factor corresponding to the unit value of the quality stability index can be directly obtained from the natural gas analysis information library when in use, which represents the numerical value of the influence of the quality stability index on the analysis quality index of the component analysis equipment during the analysis quality determination of the component analysis equipment. The corresponding relationship can be a pre-set mapping relationship. For example, the quality stability index and the influence factor corresponding to the unit value of the quality stability index preset in the natural gas analysis information library form a mapping set, and the real-time quality stability index is substituted into the mapping set to obtain the influence factor corresponding to the unit value of the quality stability index. The mapping relationship can be a one-to-one correspondence or a many-to-one relationship. In this embodiment, its value range is [0, 1].

[0115] It is the influencing factor corresponding to the time required for a single analysis predefined in the natural gas analysis information database.

[0116] In a specific embodiment, the influence factor corresponding to the time required for a single analysis can be directly obtained from the natural gas analysis information library when in use, which represents the numerical value of the influence of the time required for a single analysis on the analysis quality index of the component analysis equipment in the process of the analysis quality determination of the component analysis equipment. The corresponding relationship can be a pre-set mapping relationship. For example, the time required for a single analysis and the influence factor corresponding to the time required for a single analysis preset in the natural gas analysis information library form a mapping set, and the real-time time required for a single analysis is substituted into the mapping set to obtain the influence factor corresponding to the time required for a single analysis. The mapping relationship can be a one-to-one correspondence or a many-to-one relationship. In this embodiment, its value range is [0, 1].

[0117] In this embodiment, the analysis time of the component analysis equipment determines the time from the start of the analysis of the natural gas sample to the time when the analysis result is obtained. If the quality stability index of the natural gas during the transfer and inspection period is large, it means that the quality of the natural gas is relatively stable during the transfer and inspection process. Then the component analysis equipment can obtain the analysis result of the natural gas in a shorter analysis time, and the analysis quality of the component analysis equipment is higher. During the operation of the component analysis equipment, if the humidity of the environment to which it belongs is too high, it may cause corrosion, short circuit and other problems inside the equipment, thereby affecting the performance and accuracy of the equipment. At the same time, if the humidity is too low, it may cause oxidation and damage of the electronic components inside the equipment, thereby affecting the stability and reliability of the equipment. Moreover, when the environmental humidity deviates greatly from the appropriate humidity, the equipment may take a longer time to stabilize and achieve accurate analysis results. Therefore, the component analysis equipment needs to achieve the best operating effect under the appropriate environmental humidity. In addition, in an environment with too high humidity, the metal parts inside the equipment may be more susceptible to vibration due to corrosion. If the humidity is too low, some materials inside the equipment may become fragile, thereby being more susceptible to damage due to vibration, further affecting the performance of the equipment. In summary, these factors need to be comprehensively considered during the operation of the component analysis equipment to ensure the accuracy of the component analysis equipment.

[0118] Specifically, the feedback of natural gas sampling and component analysis is as follows:

[0119] The analysis quality index of the component analysis equipment is compared with the analysis quality preset index predefined in the natural gas analysis information library. If the analysis quality index of the component analysis equipment is greater than the analysis quality preset index, quality feedback is given to the natural gas sampling and component analysis. If the analysis quality index of the component analysis equipment is equal to or less than the analysis quality preset index, an early warning is given to the operating status of the component analysis equipment.

[0120] The above-mentioned quality feedback specifically involves comparing the natural gas composition analysis results obtained by the component analysis equipment with the specified environmental emission verification samples to determine whether the natural gas product meets the quality specifications.

[0121] The above-mentioned early warning of the operating status of the component analysis equipment is specifically to monitor the analysis quality index of the component analysis equipment in real time through the early warning mechanism. When it is monitored that the analysis quality index of the component analysis equipment is equal to or less than the preset analysis quality index, an early warning signal is automatically triggered, and an early warning report is generated to display the real-time status information, historical trends and analysis results of the equipment, so as to help operation and maintenance personnel better understand the operating status of the equipment.

[0122] The above-mentioned early warning mechanism is a mechanism of the present system for monitoring the analysis status of the component analysis equipment.

[0123] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A natural gas sampling and component analysis system, characterized in that: include: The environmental data matching module is used to obtain the historical data of natural gas sampling and establish the comprehensive evaluation index of natural gas sampling, so as to match the environmental data corresponding to the natural gas sampling; The sampling and inspection module is used to arrange the natural gas transmission pipeline for several sampling arrangements according to the preset sampling arrangement mode, and randomly extract a certain sampling arrangement transmission pipeline, which is recorded as the sampling transmission pipeline, thereby sampling the natural gas belonging to the sampling transmission pipeline through the environmental data corresponding to the natural gas sampling and transferring it for inspection; The quality stability index evaluation module is used to obtain the natural gas quality information of the cylinder device to which the transfer inspection belongs, determine the quality stability index of the natural gas during the transfer inspection period, and compare it with the predefined quality stability preset value. If the quality stability index of the natural gas during the transfer inspection period is greater than the quality stability preset value, the natural gas in the cylinder device is subjected to component analysis; The analysis quality index determination module is used to obtain the operating status data of the component analysis equipment and determine the analysis quality index of the component analysis equipment in combination with the quality stability index of the natural gas during the transfer and inspection period, so as to provide feedback on the natural gas sampling and component analysis; The quality stability index of the natural gas during the transfer and inspection period is obtained by comprehensive analysis of the methane content of the natural gas at the start time of the transfer and inspection, the methane content of the natural gas at the end time of the transfer and inspection, the medium density of the natural gas medium at the end time of the transfer and inspection, and the internal average temperature value and average pressure value of the cylinder device during the transfer and inspection period.

2. A natural gas sampling and component analysis system according to claim 1, characterized in that: The comprehensive evaluation index of natural gas sampling is established, and the specific establishment process is as follows: The natural gas sampling historical data specifically includes the historical average flow rate of the natural gas medium, the historical average temperature of the natural gas pipeline, and the historical average density of the natural gas medium; Extracting historical adaptation velocity, historical adaptation temperature and historical reference density from the natural gas analysis information database; Based on the historical data of natural gas sampling, the comprehensive evaluation index of natural gas sampling is established.

3. A natural gas sampling and component analysis system according to claim 2, characterized in that: The environmental data corresponding to the natural gas sampling is matched, and the specific matching process is as follows: Matching the comprehensive evaluation index of natural gas sampling with the environmental data corresponding to each predefined comprehensive evaluation index interval, thereby obtaining the environmental data corresponding to the natural gas sampling; The environmental data corresponding to the natural gas sampling specifically includes the environmental temperature and environmental pressure values ​​corresponding to the natural gas sampling.

4. A natural gas sampling and component analysis system according to claim 1, characterized in that: The preset sampling arrangement method is specifically to arrange the sampling according to the preset pipeline depth, pipeline length and pipeline natural gas flow direction.

5. A natural gas sampling and component analysis system according to claim 1, characterized in that: The natural gas quality information of the cylinder device to which the transfer and inspection belongs specifically includes the methane content of the natural gas at the start time of the transfer and inspection, the methane content of the natural gas at the end time of the transfer and inspection, the medium density of the natural gas medium at the end time of the transfer and inspection, and the internal average temperature and average pressure value of the cylinder device during the transfer and inspection period.

6. A natural gas sampling and component analysis system according to claim 5, characterized in that: The specific determination process of determining the quality stability index of natural gas during the transfer and inspection period is as follows: Extract the medium reference density from the natural gas analysis information database; According to the natural gas quality information of the cylinder device to which the transfer is sent for inspection, the quality stability index of the natural gas during the transfer inspection period is comprehensively determined. The specific method is as follows: In the formula, It is the quality stability index of natural gas during the transfer and inspection period. is the methane content of natural gas at the time when the transfer and inspection begins. is the methane content of natural gas at the end of transfer and inspection, is the medium density of the natural gas medium at the end of the transfer and inspection time, is the medium reference density, is the average internal temperature of the cylinder device during the transfer and inspection period. is the ambient temperature corresponding to natural gas sampling, is the average pressure value of the cylinder device during the transfer and inspection period. is the ambient pressure value corresponding to natural gas sampling, is the impact factor corresponding to the unit value of methane deviation content predefined in the natural gas analysis information database, is the influencing factor corresponding to the unit value of the internal and external temperature deviation value predefined in the natural gas analysis information database, It is the influencing factor corresponding to the unit value of the internal and external pressure deviation value predefined in the natural gas analysis information database, and e is a natural constant.

7. A natural gas sampling and component analysis system according to claim 1, characterized in that: The quality stability index of the natural gas during the transfer inspection period is compared with the predefined quality stability preset value. The specific comparison process is as follows: If the comparison result shows that the quality stability index of natural gas during the transfer and inspection period is greater than the quality stability preset value, the natural gas in the cylinder device is subjected to component analysis. If the comparison result shows that the quality stability index of natural gas during the transfer and inspection period is equal to or less than the quality stability preset value, the acquisition of natural gas sampling historical data is increased, and the environmental data corresponding to the natural gas sampling is matched again, so that the natural gas in the cylinder device can finally be subjected to component analysis.

8. A natural gas sampling and component analysis system according to claim 1, characterized in that: The operating status data of the component analysis device specifically includes the average vibration frequency of the component analysis device during the analysis cycle, the maximum humidity of the environment of the area to which the component analysis device belongs, and the duration required for each analysis of the component analysis device during the analysis cycle.

9. A natural gas sampling and component analysis system according to claim 1, characterized in that: The specific determination process of the analysis quality index of the component analysis equipment is as follows: Extract the suitable humidity and vibration limit frequency from the natural gas analysis information database; The analysis quality index of the component analysis equipment is comprehensively determined based on the operating status data of the component analysis equipment and combined with the quality stability index of the natural gas during the transfer and inspection period.

10. A natural gas sampling and component analysis system according to claim 1, characterized in that: Feedback on natural gas sampling and component analysis. The specific feedback process is as follows: The analysis quality index of the component analysis equipment is compared with the predefined analysis quality preset index. If the analysis quality index of the component analysis equipment is greater than the analysis quality preset index, quality feedback is given to the natural gas sampling and component analysis. If the analysis quality index of the component analysis equipment is equal to or less than the analysis quality preset index, an early warning is given to the operating status of the component analysis equipment.

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