Biological source carbon isotope enrichment method and system

Abstract

The invention relates to the technical field of carbon isotope enrichment, and discloses a biological source carbon isotope enrichment method and system.The method comprises the steps that combustion flue gas is filtered, a solid sample to be detected is separated out and compressed, and compressed gas is introduced into a fractionating tower for low-temperature fractionation; collecting the compressed gas amount, determining the gas reflux amount, collecting the gas primary enrichment amount, comparing the gas primary enrichment amount with historical data, and judging whether the gas reflux amount is adjusted or not; when it is judged that adjustment is carried out, the compressed gas amount and the gas primary enrichment amount are compared with historical data, a backflow adjustment factor is determined according to the similarity, the gas backflow amount is adjusted, low-temperature fractionation is completed through the adjusted gas backflow amount, and a gas sample to be detected is obtained; and performing carbon element detection on the solid to-be-detected sample and the gas to-be-detected sample, and determining the biological source carbon proportion. According to the invention, historical data is used for dynamic optimization, so that the carbon isotope enrichment effect is improved, and the precision and reliability of carbon isotope detection are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon isotope enrichment, and in particular to a method and system for biogenic carbon isotope enrichment. Background Art

[0002] In energy production and industrial activities, the exhaust gas produced by the combustion process contains a large amount of carbon dioxide and other gases. These exhaust gases contain not only carbon elements, but also solid particles and impurities. As global attention to climate change and environmental protection increases, it is increasingly important to accurately measure and monitor carbon emissions, especially to determine the proportion of biogenic carbon. Biogenic carbon mainly comes from the combustion of biomass fuels, while the combustion of fossil fuels releases fossil carbon, which is the main factor leading to the increase in carbon dioxide concentration in the atmosphere.

[0003] When currently testing biocarbon isotopes, low-temperature fractionation is often used to separate carbon dioxide gas, and the carbon isotope ratio is obtained through accelerator mass spectrometry. Therefore, the accuracy of low-temperature fractionation directly affects the test results. When performing low-temperature fractionation in a fractionation tower, multiple fractionations are often used to improve the fractionation effect. Multiple fractionations involve the judgment of the reflux volume. Currently, the judgment of the reflux volume often relies on the workers' experience and judgment, and cannot be dynamically adjusted according to the actual situation. There is a lack of feedback adjustment mechanism. Because it is easily affected by human factors, the detection reliability is low.

[0004] Therefore, it is necessary to design a method and system for biogenic carbon isotope enrichment to solve the problems existing in current technology. Summary of the invention

[0005] In view of this, the present invention proposes a method and system for biogenic carbon isotope enrichment, aiming to solve the problems existing in the current carbon isotope enrichment technology, such as lack of feedback regulation mechanism in the enrichment process, large variability in enrichment effects, and low detection reliability.

[0006] In one aspect, the present invention provides a method for biogenic carbon isotope enrichment, comprising: The combustion flue gas is filtered to separate the solid sample to be tested, and the filtered flue gas is introduced into a vacuum tank for compression, and the compressed gas is passed into a distillation tower for low-temperature fractionation; Collect the compressed gas volume and determine the gas reflux volume, collect the gas primary enrichment volume and compare it with historical data, and determine whether to adjust the gas reflux volume according to the comparison result; When it is determined that the gas reflux amount is to be adjusted, the compressed gas amount and the gas primary enrichment amount are compared with the historical data, and a reflux adjustment factor is determined according to the similarity; when the similarity is higher than a similarity threshold, the reflux adjustment factor is determined according to the historical data; when the similarity is lower than or equal to the similarity threshold, a similar set is determined by a clustering algorithm, and the reflux adjustment factor is determined according to the similar set and real-time environmental data; The gas reflux amount is adjusted according to the reflux adjustment factor, and low-temperature fractionation is performed with the adjusted gas reflux amount to obtain a gas sample to be detected; The compressed gas volume, the primary gas enrichment volume and the reflux adjustment factor are stored, and the solid sample to be detected and the gas sample to be detected are subjected to carbon element detection to determine the biogenic carbon ratio.

[0007] Furthermore, when collecting the compressed gas volume and determining the gas reflux volume, it includes: The compressed gas volume is compared with a first preset gas volume and a second preset gas volume, the first preset gas volume is smaller than the second preset gas volume, and the gas reflux volume is determined according to the comparison result; When the compressed gas amount is less than or equal to the first preset gas amount, determining the gas reflux amount to be the first preset gas reflux amount; When the compressed gas amount is greater than the first preset gas amount and less than or equal to the second preset gas amount, determining the gas reflux amount to be the second preset gas reflux amount; When the compressed gas amount is greater than the second preset gas amount, determining the gas reflux amount to be a third preset gas reflux amount; The first preset gas reflux flow rate is smaller than the second preset gas reflux flow rate, and the second preset gas reflux flow rate is smaller than the third preset gas reflux flow rate.

[0008] Further, judging whether to adjust the gas reflux amount according to the comparison result includes: The historical data includes the historical qualified data mean, the historical primary enrichment amount, the historical compressed gas amount and the historical reflux adjustment factor, and the historical primary enrichment amount and the historical reflux adjustment factor correspond to the historical compressed gas amount; Compare the primary enrichment amount of the gas with the average value of the historical qualified data in the historical data, and determine whether to adjust the gas reflux amount according to the comparison result; When the primary enrichment amount of the gas is less than the average value of the historical qualified data in the historical data, it is determined that the gas reflux amount is to be adjusted; When the primary enrichment amount of the gas is greater than or equal to the average value of the historical qualified data in the historical data, it is determined that the gas reflux amount is not adjusted, and low-temperature fractionation is performed according to the current gas reflux amount to obtain the gas sample to be tested.

[0009] Furthermore, when determining the reflux adjustment factor according to the similarity, the similarity is calculated by the following formula:

[0010] Among them, S represents the similarity, Y represents the standardized result of the compressed gas volume, Y0 represents the standardized result of the historical compressed gas volume, F represents the standardized result of the gas primary enrichment volume, F0 represents the standardized result of the historical primary enrichment volume, α and β represent weight coefficients, and α+β=1.

[0011] Furthermore, after determining the reflux adjustment factor according to the similarity, it also includes: Comparing the similarity with a preset similarity threshold, and determining a reflux adjustment factor according to the comparison result; When there is data in the historical data with a similarity greater than a similarity threshold, determining the reflux adjustment factor according to the historical data; When there is no data with a similarity greater than a similarity threshold in the historical data, the reflux adjustment factor is determined according to the similar set and the real-time environment data.

[0012] Further, when determining the reflux adjustment factor according to the historical data, it includes: When the data in the historical data whose similarity is greater than the similarity threshold is unique, the historical reflux adjustment factor corresponding to the data is used as the reflux adjustment factor; When the data in the historical data whose similarity is greater than the similarity threshold is not unique, the average of the historical reflux adjustment factors corresponding to the data is used as the reflux adjustment factor.

[0013] Further, in determining the reflux adjustment factor according to the similar set and the real-time environment data, obtaining the similar set includes: The compressed gas volume, the primary gas enrichment volume and the historical data are used as the data set to be aggregated; Extracting a historical reflux adjustment factor corresponding to each data in the data set to be aggregated; Determine the expected number of clusters k as 2 and initialize the parameters of the Gaussian distribution; Calculate the probability that each data in the to-be-aggregated data set belongs to each Gaussian distribution, and obtain a responsibility value; A data set corresponding to the amount of compressed gas and the amount of primary gas enrichment is obtained according to the responsibility value, and the data set is used as a close set.

[0014] Further, when determining the reflux adjustment factor according to the similar set and the real-time environmental data, it includes: Obtaining a mean value of the reflux adjustment factors in the similar set according to the similar set, collecting the real-time temperature and comparing the real-time temperature with a first preset temperature and a second preset temperature, wherein the first preset temperature is less than the second preset temperature, and adjusting the mean value of the reflux adjustment factor according to the comparison result to obtain the reflux adjustment factor; When the real-time temperature is less than or equal to the first preset temperature, determining a first adjustment coefficient to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor; When the real-time temperature is greater than the first preset temperature and less than or equal to the second preset temperature, determining a second adjustment coefficient to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor; When the real-time temperature is greater than the second preset temperature, determining a third adjustment coefficient to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor; The first adjustment coefficient is smaller than the second adjustment coefficient, and the second adjustment coefficient is smaller than the third adjustment coefficient.

[0015] Further, when the gas reflux amount is adjusted according to the reflux adjustment factor, it includes: The gas reflux amount is proportional to the reflux adjustment factor.

[0016] Compared with the prior art, the beneficial effects of the present invention are: filtering the combustion flue gas, separating solid impurities, helping to remove particulate matter that affects the analysis, and making the subsequent gas processing more focused on the separation and enrichment of carbon dioxide. By accurately controlling the reflux amount of the gas, low-temperature fractionation operation is performed in the distillation tower, and dynamic adjustment is achieved to reduce human errors and improve the stability and accuracy of the fractionation. The multiple fractionation strategy is combined with real-time data feedback to improve the enrichment efficiency. The current amount of compressed gas and the amount of gas enrichment are collected and compared with historical data. The similarity calculation is used to determine whether the gas reflux amount needs to be adjusted, and dynamic optimization based on real-time data is achieved. The storage and use of historical data helps to optimize operating parameters in the long term, quickly find appropriate adjustment strategies under new operating conditions, and improve efficiency and reliability. By analyzing the isotopic ratios of C14, C13 and C12, the ratio of biogenic carbon and fossil carbon is distinguished. The comprehensiveness of the detection is improved, which is conducive to evaluating and monitoring the source of carbon emissions during the combustion process.

[0017] On the other hand, the present application also provides a biogenic carbon isotope enrichment system for applying the above-mentioned biogenic carbon isotope enrichment method, comprising: A filtering device, used to filter the combustion flue gas and separate the solid sample to be tested; A vacuum tank for compressing the filtered flue gas; A fractionation tower for low-temperature fractionation of compressed gas; The control device includes a collection unit, a processing unit, an adjustment unit and a detection unit; wherein, The collection unit is configured to collect the compressed gas volume and determine the gas reflux volume, collect the gas primary enrichment volume and compare it with historical data, and determine whether to adjust the gas reflux volume according to the comparison result; The processing unit is configured to, when determining to adjust the gas reflux amount, compare the compressed gas amount and the gas primary enrichment amount with the historical data, and determine the reflux adjustment factor according to the similarity; when the similarity is higher than the similarity threshold, determine the reflux adjustment factor according to the historical data; when the similarity is lower than or equal to the similarity threshold, determine a similar set by a clustering algorithm, and determine the reflux adjustment factor according to the similar set and real-time environmental data; The adjustment unit is configured to adjust the gas reflux amount according to the reflux adjustment factor, and perform low-temperature fractionation with the adjusted gas reflux amount to obtain a gas sample to be detected; The detection unit is configured to store the amount of compressed gas, the amount of gas primary enrichment, and the reflux adjustment factor, and to perform carbon element detection on the solid sample to be detected and the gas sample to be detected to determine the biogenic carbon ratio.

[0018] It is understandable that the above-mentioned biogenic carbon isotope enrichment method set system has the same beneficial effects and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A flow chart of a method for biogenic carbon isotope enrichment provided in an embodiment of the present invention; Figure 2 A structural block diagram of a biogenic carbon isotope enrichment system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In energy production and industrial activities, the combustion process produces a large amount of waste gas, which mainly includes carbon dioxide and other gases, as well as solid particles and impurities. With the increasing global attention to climate change and environmental protection, it is particularly important to accurately measure and monitor carbon emissions, especially to distinguish the proportion of biogenic carbon and fossil carbon in the waste gas. Biomass absorbs C14 from the atmosphere during its growth, while in fossil fuels, this C14 has almost completely disappeared due to radioactive decay. Therefore, by detecting the C14 content in the waste gas, the proportion of biogenic carbon in it can be determined. When conducting biocarbon isotope detection, low-temperature fractionation technology is usually used to separate carbon dioxide from the waste gas, and its carbon isotope ratio is analyzed by accelerator mass spectrometry. However, in actual operation, the adjustment of the reflux volume often depends on the experience of the workers, and there is a lack of a feedback mechanism for dynamic adjustment based on real-time conditions. This artificial operation method is easily affected by experience and judgment bias, resulting in low stability and reliability of the test results.

[0022] Therefore, it is necessary to design a method and system for biogenic carbon isotope enrichment to solve the problems existing in current technology.

[0023] In some embodiments of the present application, see Figure 1 As shown, a method for enriching carbon isotopes of biological origin comprises: S100: Filter the combustion flue gas to separate the solid sample to be tested, introduce the filtered flue gas into a vacuum tank for compression, and pass the compressed gas into a distillation tower for low-temperature distillation.

[0024] S200: Collect the compressed gas volume and determine the gas reflux volume, collect the gas primary enrichment volume and compare it with historical data, and determine whether to adjust the gas reflux volume based on the comparison result.

[0025] S300: When it is determined that the gas reflux volume is to be adjusted, the compressed gas volume and the gas primary enrichment volume are compared with the historical data, and the reflux adjustment factor is determined according to the similarity. When the similarity is higher than the similarity threshold, the reflux adjustment factor is determined according to the historical data. When the similarity is lower than or equal to the similarity threshold, a similar set is determined by a clustering algorithm, and the reflux adjustment factor is determined according to the similar set and the real-time environmental data.

[0026] S400: adjusting the gas reflux rate according to the reflux adjustment factor, performing low-temperature fractionation with the adjusted gas reflux rate, and obtaining a gas sample to be detected.

[0027] S500: The compressed gas volume, the primary gas enrichment volume and the reflux adjustment factor are stored, and carbon element detection is performed on the solid sample to be detected and the gas sample to be detected to determine the biogenic carbon ratio.

[0028] Specifically, the combustion flue gas is filtered to remove solid impurities and particulate matter. Avoid solid impurities from interfering with the analysis results. The filtered flue gas is introduced into a vacuum tank for compression to reduce the gas volume and provide pretreatment for subsequent low-temperature fractionation operations. The compressed gas is introduced into a fractionation tower, and carbon dioxide is further separated by low-temperature fractionation technology. Ensure that carbon dioxide is effectively enriched in the sample, thereby improving the accuracy of subsequent detection. During the compression and fractionation process, the compressed gas volume and the gas primary enrichment volume are collected in real time. The current collected data is compared with the historical data to determine whether the gas reflux volume needs to be adjusted. The comparison process can identify the difference between the current operation and the historical situation, thereby providing a basis for the dynamic adjustment of the reflux volume. If the gas reflux volume needs to be adjusted, the reflux adjustment factor is first determined by calculating the similarity between the current data and the historical data. A high similarity indicates that the current operation is close to the historical data, and the reflux adjustment factor in the historical data can be used directly. When the similarity is less than or equal to the threshold, a clustering algorithm is used to determine the historical data set that is most similar to the current operating conditions. Through cluster analysis, the data set closest to the current conditions is extracted from the historical data, and combined with the real-time environmental data, a more accurate reflux adjustment factor is determined. The adaptability and accuracy under different operating conditions are enhanced. According to the determined reflux adjustment factor, the gas reflux amount in the distillation tower is dynamically adjusted. It is carried out according to the comprehensive analysis results of real-time data and historical best operations, ensuring that the distillation operation is carried out under the best conditions, so as to obtain high-quality gas samples to be tested. The amount of compressed gas, the amount of gas enriched once and the reflux adjustment factor in each operation are stored in detail. The separated solid samples and gas samples are subjected to detailed carbon element detection, and preferably the ratio of C14, C13 and C12 is analyzed by accelerator mass spectrometry. Through analysis, the ratio of biogenic carbon and fossil carbon can be accurately determined, providing an important basis for accurate monitoring and management of carbon emissions.

[0029] It is understandable that the separation and enrichment efficiency of carbon dioxide in combustion flue gas has been significantly improved by integrating multiple technologies such as filtration, compression, low-temperature fractionation, real-time data feedback and intelligent adjustment. Not only does it optimize the fractionation effect by dynamically adjusting the reflux flow rate to ensure the high accuracy and reliability of carbon isotope analysis, but it also uses historical data and real-time environmental data to make intelligent decisions and adjustments, reducing the uncertainty caused by human operation.

[0030] In some embodiments of the present application, when collecting the compressed gas volume and determining the gas reflux volume, it includes: comparing the compressed gas volume with a preset first preset gas volume and a second preset gas volume, the first preset gas volume is smaller than the second preset gas volume, and determining the gas reflux volume based on the comparison result.

[0031] Specifically, when the amount of compressed gas is less than or equal to the first preset gas amount, the gas reflux amount is determined to be the first preset gas reflux amount. When the amount of compressed gas is greater than the first preset gas amount and less than or equal to the second preset gas amount, the gas reflux amount is determined to be the second preset gas reflux amount. When the amount of compressed gas is greater than the second preset gas amount, the gas reflux amount is determined to be the third preset gas reflux amount. The first preset gas reflux amount is less than the second preset gas reflux amount, and the second preset gas reflux amount is less than the third preset gas reflux amount.

[0032] It is understandable that the reflux adjustment is divided into multiple stages through the preset gas volume threshold. The segmented adjustment method can dynamically and accurately adjust the gas reflux volume according to different compressed gas volumes, so as to better adapt to different operating conditions. By setting multiple preset reflux volumes, the fractionation efficiency and fractionation accuracy can be effectively balanced to avoid excessive or insufficient reflux adjustment. It not only improves the separation effect of low-temperature fractionation, but also ensures the accuracy and consistency of carbon isotope analysis, reduces human intervention, and enhances stability and reliability. The automated control method reduces dependence on manual experience.

[0033] In some embodiments of the present application, when judging whether to adjust the gas reflux amount based on the comparison result, it includes: the historical data includes the historical qualified data mean, the historical primary enrichment amount, the historical compressed gas amount and the historical reflux adjustment factor, and the historical primary enrichment amount, the historical reflux adjustment factor and the historical compressed gas amount correspond to each other; the gas primary enrichment amount is compared with the historical qualified data mean in the historical data, and it is judged whether to adjust the gas reflux amount based on the comparison result.

[0034] Specifically, when the primary enrichment amount of the gas is less than the average of the historical qualified data in the historical data, it is determined that the gas reflux amount should be adjusted; when the primary enrichment amount of the gas is greater than or equal to the average of the historical qualified data in the historical data, it is determined that the gas reflux amount should not be adjusted, and low-temperature distillation is completed according to the current gas reflux amount to obtain a gas sample to be tested.

[0035] It is understandable that the mean value of historical qualified data can be set according to the fractionation requirements, and it can be used as a judgment indicator, and its specific value can be changed in actual application. By introducing the mean value of historical qualified data as a reference benchmark, the accuracy and automation of gas reflux adjustment are improved. By comparing the current gas primary enrichment amount with the average value of historical successful operations, the interference and error of human judgment are reduced, and the adaptability of the system to different operating conditions is enhanced. In addition, the mean value of historical qualified data can be used as a dynamic benchmark and can be adjusted according to actual needs.

[0036] In some embodiments of the present application, when determining the reflux adjustment factor according to the similarity, the similarity is calculated by the following formula:

[0037] Among them, S represents the similarity, Y represents the standardized result of the compressed gas volume, Y0 represents the standardized result of the historical compressed gas volume, F represents the standardized result of the gas primary enrichment volume, F0 represents the standardized result of the historical primary enrichment volume, α and β represent weight coefficients, and α+β=1.

[0038] It is understandable that the data standardization results mentioned above are the results of processing the original data using a normalization equation to facilitate calculations under the same dimension. By standardizing the compressed gas volume and the gas primary enrichment volume, data under different operating conditions can be compared fairly, eliminating errors caused by different absolute values. The introduction of weight coefficients allows the influence weights of the compressed gas volume and the gas primary enrichment volume in the similarity calculation to be flexibly adjusted according to specific application scenarios, thereby further improving the accuracy and applicability of the adjustment.

[0039] In some embodiments of the present application, after determining the reflux adjustment factor according to the similarity, the method further includes: comparing the similarity with a preset similarity threshold, and determining the reflux adjustment factor according to the comparison result.

[0040] Specifically, when there is data with a similarity greater than a similarity threshold in the historical data, the reflux adjustment factor is determined according to the historical data. When there is no data with a similarity greater than a similarity threshold in the historical data, the reflux adjustment factor is determined according to the similar set and the real-time environment data.

[0041] In some embodiments of the present application, when determining the reflux adjustment factor based on historical data, it includes: when the data with similarity greater than the similarity threshold in the historical data is unique, the historical reflux adjustment factor corresponding to the data is used as the reflux adjustment factor. When the data with similarity greater than the similarity threshold in the historical data is not unique, the average of the historical reflux adjustment factors corresponding to each data is used as the reflux adjustment factor.

[0042] It is understandable that the degree of match between the current operating conditions and the historical successful conditions is determined by the similarity threshold. When historical data with high similarity are found, these data can be directly used to determine the reflux adjustment factor, thereby ensuring the reliability and consistency of the fractionation operation. For situations where the current operating conditions do not completely match the historical data, similar data sets are clustered and analyzed, and the reflux factor is dynamically adjusted in combination with real-time environmental data. In response to changes in operating conditions, data-driven automated adjustments reduce reliance on human experience and intuition, reduce uncertainty and operational risks caused by human judgment, and thus improve the automation level of the system and the accuracy of the test results. By comprehensively utilizing a large amount of historical data, a wealth of reference information is provided for the determination of the reflux adjustment factor, and it is possible to learn and optimize from historical experience, thereby continuously improving the accuracy and efficiency of operations.

[0043] In some embodiments of the present application, in determining the reflux adjustment factor based on the similar set and the real-time environmental data, obtaining the similar set includes: taking the compressed gas volume, the gas primary enrichment volume and the historical data as the data set to be aggregated. Extracting the historical reflux adjustment factor corresponding to each data in the data set to be aggregated. Determine the expected number of clusters k as 2, and initialize the parameters of the Gaussian distribution. Calculate the probability that each data in the data set to be aggregated belongs to each Gaussian distribution, and obtain the responsibility value. According to the responsibility value, obtain the data set corresponding to the compressed gas volume and the gas primary enrichment volume, and take the data set as the similar set.

[0044] In some embodiments of the present application, when determining the reflux adjustment factor based on the similar set and real-time environmental data, it includes: obtaining the mean reflux adjustment factor in the similar set based on the similar set, collecting the real-time temperature and comparing the real-time temperature with a pre-set first preset temperature and a second preset temperature, the first preset temperature is less than the second preset temperature, and adjusting the mean reflux adjustment factor according to the comparison result to obtain the reflux adjustment factor.

[0045] Specifically, when the real-time temperature is less than or equal to the first preset temperature, the first adjustment coefficient is determined to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor. When the real-time temperature is greater than the first preset temperature and less than or equal to the second preset temperature, the second adjustment coefficient is determined to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor. When the real-time temperature is greater than the second preset temperature, the third adjustment coefficient is determined to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor. Among them, the first adjustment coefficient is less than the second adjustment coefficient, and the second adjustment coefficient is less than the third adjustment coefficient.

[0046] It is understandable that by analyzing historical data through clustering algorithms, the historical data set closest to the current operating conditions is found, which improves the accuracy of determining the reflux adjustment factor. The dynamic adjustment mechanism of real-time temperature ensures that the operating parameters can be adaptively adjusted under different environmental conditions, thereby maintaining the stability and efficiency of the fractionation process. It reduces the reliance on manual experience and judgment, reduces human errors in operation, and improves the automation level and reliability of the overall system. Temperature directly affects the density, viscosity and volatility of the gas, thereby affecting the efficiency and stability of the fractionation. By considering real-time temperature changes, the reflux volume can be accurately controlled to ensure the stable operation of the system under different environmental conditions, optimize the use of energy and resources, and improve the system's dynamic response to changes in external conditions. Through accurate calculation of the reflux adjustment factor, excessive or insufficient reflux adjustment is avoided, thereby optimizing the utilization of resources and reducing the waste of energy and materials. Adjustment combined with real-time temperature data improves the flexibility and real-time adaptability of the fractionation process, especially when dealing with operating environments with large fluctuations, the advantages are more significant.

[0047] In some embodiments of the present application, when the gas reflux amount is adjusted according to the reflux adjustment factor, it includes: the gas reflux amount is proportional to the reflux adjustment factor.

[0048] Specifically, the gas reflux amount is adjusted according to the reflux adjustment factor K. Assuming that the basic reflux amount is L0, the adjusted gas reflux amount is determined to be L0*K. When a higher reflux amount is required, the reflux adjustment factor will increase accordingly. By establishing a proportional relationship between the reflux amount and the reflux adjustment factor, precise control of the gas reflux amount is achieved during the low-temperature fractionation process. The amount of compressed gas in the distillation tower and the amount of gas enriched once are collected in real time. By calculating the reflux adjustment factor, the gas reflux amount is adjusted to make the fractionation process more efficient and accurate.

[0049] In the above embodiment, the combustion flue gas is filtered to separate solid impurities, which helps to remove particulate matter that affects the analysis, so that the subsequent gas processing is more focused on the separation and enrichment of carbon dioxide. By accurately controlling the reflux amount of the gas, low-temperature fractionation operation is performed in the distillation tower, and dynamic adjustment is achieved to reduce human errors and improve the stability and accuracy of the fractionation. The multiple fractionation strategy is combined with real-time data feedback to improve the enrichment efficiency. The current amount of compressed gas and the amount of gas enrichment are collected and compared with historical data. The similarity calculation is used to determine whether the gas reflux amount needs to be adjusted, and dynamic optimization based on real-time data is achieved. The storage and use of historical data helps to optimize operating parameters in the long term, quickly find suitable adjustment strategies under new operating conditions, and improve efficiency and reliability. By analyzing the isotopic ratios of C14, C13 and C12, the ratio of biogenic carbon and fossil carbon is distinguished. The comprehensiveness of the detection is improved, which is conducive to evaluating and monitoring the source of carbon emissions during the combustion process.

[0050] In another preferred embodiment based on the above embodiment, refer to Figure 2 As shown, this embodiment provides a biogenic carbon isotope enrichment system for applying the above-mentioned biogenic carbon isotope enrichment method, including: A filtering device, used to filter the combustion flue gas and separate the solid sample to be tested; A vacuum tank for compressing the filtered flue gas; A fractionation tower for low-temperature fractionation of compressed gas; The control device includes a collection unit, a processing unit, an adjustment unit and a detection unit; wherein, The collection unit is configured to collect the compressed gas volume and determine the gas reflux volume, collect the gas primary enrichment volume and compare it with historical data, and determine whether to adjust the gas reflux volume according to the comparison result; The processing unit is configured to compare the compressed gas volume and the gas primary enrichment volume with the historical data when it is determined that the gas reflux volume is to be adjusted, and determine the reflux adjustment factor according to the similarity; when the similarity is higher than the similarity threshold, determine the reflux adjustment factor according to the historical data; when the similarity is lower than or equal to the similarity threshold, determine a similar set by a clustering algorithm, and determine the reflux adjustment factor according to the similar set and the real-time environmental data; The adjustment unit is configured to adjust the gas reflux amount according to the reflux adjustment factor, and perform low-temperature fractionation with the adjusted gas reflux amount to obtain a gas sample to be detected; The detection unit is configured to store the amount of compressed gas, the amount of gas enriched once, and the reflux adjustment factor, and to perform carbon element detection on the solid sample to be detected and the gas sample to be detected to determine the proportion of biogenic carbon.

[0051] It is understandable that filtering the combustion flue gas and separating solid impurities can help remove particulate matter that affects the analysis, so that subsequent gas processing can focus more on the separation and enrichment of carbon dioxide. By accurately controlling the reflux rate of the gas and performing low-temperature fractionation operations in the distillation tower, dynamic adjustment can be achieved to reduce human errors and improve the stability and accuracy of the fractionation. The multiple fractionation strategy combined with real-time data feedback improves the enrichment efficiency. The current compressed gas volume and the gas enrichment volume are collected and compared with historical data. The similarity calculation is used to determine whether the gas reflux volume needs to be adjusted, realizing dynamic optimization based on real-time data. The storage and use of historical data can help optimize operating parameters in the long term, quickly find appropriate adjustment strategies under new operating conditions, and improve efficiency and reliability. By analyzing the isotopic ratios of C14, C13 and C12, the ratio of biogenic carbon and fossil carbon can be distinguished. The comprehensiveness of the detection is improved, which is conducive to evaluating and monitoring the source of carbon emissions during the combustion process.

[0052] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0053] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0054] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0055] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for enriching carbon isotopes from biological sources, characterized in that: include: The combustion flue gas is filtered to separate the solid sample to be tested, and the filtered flue gas is introduced into a vacuum tank for compression, and the compressed gas is passed into a distillation tower for low-temperature fractionation; Collect the compressed gas volume and determine the gas reflux volume, collect the gas primary enrichment volume and compare it with historical data, and determine whether to adjust the gas reflux volume according to the comparison result; When it is determined that the gas reflux amount is to be adjusted, the compressed gas amount and the gas primary enrichment amount are compared with the historical data, and a reflux adjustment factor is determined according to the similarity; When the similarity is higher than the similarity threshold, determining the reflux adjustment factor according to the historical data; When the similarity is lower than or equal to the similarity threshold, a similar set is determined by a clustering algorithm, and the reflux adjustment factor is determined according to the similar set and the real-time environment data; The gas reflux amount is adjusted according to the reflux adjustment factor, and low-temperature fractionation is performed with the adjusted gas reflux amount to obtain a gas sample to be detected; The compressed gas volume, the primary gas enrichment volume and the reflux adjustment factor are stored, and the solid sample to be detected and the gas sample to be detected are subjected to carbon element detection to determine the biogenic carbon ratio.

2. The method for biogenic carbon isotope enrichment according to claim 1, characterized in that: When collecting compressed gas volume and determining gas return volume, it includes: The compressed gas volume is compared with a first preset gas volume and a second preset gas volume, the first preset gas volume is smaller than the second preset gas volume, and the gas reflux volume is determined according to the comparison result; When the compressed gas amount is less than or equal to the first preset gas amount, determining the gas reflux amount to be the first preset gas reflux amount; When the compressed gas amount is greater than the first preset gas amount and less than or equal to the second preset gas amount, determining the gas reflux amount to be the second preset gas reflux amount; When the compressed gas amount is greater than the second preset gas amount, determining the gas reflux amount to be a third preset gas reflux amount; The first preset gas reflux flow rate is smaller than the second preset gas reflux flow rate, and the second preset gas reflux flow rate is smaller than the third preset gas reflux flow rate.

3. The method for biogenic carbon isotope enrichment according to claim 1, characterized in that: When judging whether to adjust the gas reflux amount according to the comparison result, it includes: The historical data includes the historical qualified data mean, the historical primary enrichment amount, the historical compressed gas amount and the historical reflux adjustment factor, and the historical primary enrichment amount and the historical reflux adjustment factor correspond to the historical compressed gas amount; Compare the primary enrichment amount of the gas with the average value of the historical qualified data in the historical data, and determine whether to adjust the gas reflux amount according to the comparison result; When the primary enrichment amount of the gas is less than the average value of the historical qualified data in the historical data, it is determined that the gas reflux amount is to be adjusted; When the primary enrichment amount of the gas is greater than or equal to the average value of the historical qualified data in the historical data, it is determined that the gas reflux amount is not adjusted, and low-temperature fractionation is performed according to the current gas reflux amount to obtain the gas sample to be tested.

4. The method for biogenic carbon isotope enrichment according to claim 3, characterized in that: When determining the reflux adjustment factor based on the similarity, the similarity is calculated by the following formula: ; Among them, S represents the similarity, Y represents the standardized result of the compressed gas volume, Y0 represents the standardized result of the historical compressed gas volume, F represents the standardized result of the gas primary enrichment volume, F0 represents the standardized result of the historical primary enrichment volume, α and β represent weight coefficients, and α+β=1.

5. The method for biogenic carbon isotope enrichment according to claim 4, characterized in that: After determining the return adjustment factor based on similarity, it also includes: Comparing the similarity with a preset similarity threshold, and determining a reflux adjustment factor according to the comparison result; When there is data in the historical data with a similarity greater than a similarity threshold, determining the reflux adjustment factor according to the historical data; When there is no data with a similarity greater than a similarity threshold in the historical data, the reflux adjustment factor is determined according to the similar set and the real-time environment data.

6. The method for biogenic carbon isotope enrichment according to claim 5, characterized in that: When determining the reflux adjustment factor according to the historical data, it includes: When there is only one piece of data in the historical data whose similarity is greater than the similarity threshold, the historical reflux adjustment factor corresponding to the data is used as the reflux adjustment factor; When the data in the historical data whose similarity is greater than the similarity threshold is not unique, the average of the historical reflux adjustment factors corresponding to the data is used as the reflux adjustment factor.

7. The method for biogenic carbon isotope enrichment according to claim 6, characterized in that: In determining the reflux adjustment factor according to the similar set and the real-time environment data, obtaining the similar set includes: The compressed gas volume, the primary gas enrichment volume and the historical data are used as the data set to be aggregated; Extracting a historical reflux adjustment factor corresponding to each data in the data set to be aggregated; Determine the expected number of clusters k as 2 and initialize the parameters of the Gaussian distribution; Calculate the probability that each data in the to-be-aggregated data set belongs to each Gaussian distribution, and obtain a responsibility value; A data set corresponding to the amount of compressed gas and the amount of primary gas enrichment is obtained according to the responsibility value, and the data set is used as a close set.

8. The method for biogenic carbon isotope enrichment according to claim 7, characterized in that: When the reflux adjustment factor is determined according to the similar set and the real-time environmental data, it includes: Obtaining a mean value of the reflux adjustment factors in the similar set according to the similar set, collecting the real-time temperature and comparing the real-time temperature with a first preset temperature and a second preset temperature, wherein the first preset temperature is less than the second preset temperature, and adjusting the mean value of the reflux adjustment factor according to the comparison result to obtain the reflux adjustment factor; When the real-time temperature is less than or equal to the first preset temperature, determining a first adjustment coefficient to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor; When the real-time temperature is greater than the first preset temperature and less than or equal to the second preset temperature, determining a second adjustment coefficient to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor; When the real-time temperature is greater than the second preset temperature, determining a third adjustment coefficient to adjust the mean of the reflux adjustment factor to obtain the reflux adjustment factor; The first adjustment coefficient is smaller than the second adjustment coefficient, and the second adjustment coefficient is smaller than the third adjustment coefficient.

9. The method for biogenic carbon isotope enrichment according to claim 8, characterized in that: When the gas reflux amount is adjusted according to the reflux adjustment factor, it includes: The gas reflux amount is proportional to the reflux adjustment factor.

10. A biogenic carbon isotope enrichment system, used for applying the biogenic carbon isotope enrichment method according to any one of claims 1 to 9, characterized in that: include: A filtering device, used to filter the combustion flue gas and separate the solid sample to be tested; A vacuum tank for compressing the filtered flue gas; A fractionation tower for low-temperature fractionation of compressed gas; The control device includes a collection unit, a processing unit, an adjustment unit and a detection unit; wherein, The collection unit is configured to collect the compressed gas volume and determine the gas reflux volume, collect the gas primary enrichment volume and compare it with historical data, and determine whether to adjust the gas reflux volume according to the comparison result; The processing unit is configured to, when determining to adjust the gas reflux amount, compare the compressed gas amount and the gas primary enrichment amount with the historical data, and determine the reflux adjustment factor according to the similarity; when the similarity is higher than the similarity threshold, determine the reflux adjustment factor according to the historical data; when the similarity is lower than or equal to the similarity threshold, determine a similar set by a clustering algorithm, and determine the reflux adjustment factor according to the similar set and real-time environmental data; The adjustment unit is configured to adjust the gas reflux amount according to the reflux adjustment factor, and perform low-temperature fractionation with the adjusted gas reflux amount to obtain a gas sample to be detected; The detection unit is configured to store the amount of compressed gas, the amount of gas primary enrichment, and the reflux adjustment factor, and to perform carbon element detection on the solid sample to be detected and the gas sample to be detected to determine the biogenic carbon ratio.

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