System for analyzing influence of process requirements of air separation device on application of analyzer

Abstract

The invention discloses a system for analyzing the influence of process requirements of an air separation device on application of an analyzer, and belongs to the technical field of intelligent detection of the air separation device, and the system comprises a process analysis module and an influence factor analysis module, obtaining a main body part, a rare gas part and a trace component part corresponding to different process requirements, and dividing the trace component part into a blocking component, a combustible component and a corrosion component; respectively acquiring a first factor and a second factor which influence the detection precision of the gas analyzer according to the components; according to the first factor and the second factor, the application influence on the gas analyzer under different process requirements is analyzed, and then the result of the gas analyzer is corrected. By analyzing the influence of the technical process of the air separation device on the air analyzer, the precision of an air analysis result of the air analyzer during the operation of the air separation device is improved, and further, a guarantee is provided for the safe operation of the air separation device.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent detection of air separation devices, and in particular to an analysis system for the influence of process requirements of air separation devices on the application of analyzers. Background Art

[0002] An air separation unit is a set of industrial equipment used to separate the various gas components in the air and produce oxygen, nitrogen, argon and other gases as air components. In addition to oxygen, nitrogen, argon and rare gases (neon, helium, krypton, xenon), there are some trace components in the air. According to their properties and their influence on the air separation process, they can be divided into blocking components, combustible components and corrosive components. The blocking components are: water, CO2 and N2O; the combustible components are: hydrocarbons (CH4, C2H2, C2H4, C2H6, C3H6, C3H8, etc.), ozone and nitrogen oxides (NO x ).

[0003] These blocking components and combustible components cannot be completely removed in the air separation process. N2O can only be partially removed in the molecular sieve front-end purification equipment, with a removal rate of about 90%. Once the adsorbent CO2 reaches saturation, the adsorbed N2O will also desorb and enter the cold box with the air. Since the boiling point of N2O is higher than other components such as oxygen and nitrogen, and its solubility is low and its relative volatility is small, N2O will eventually enter the liquid oxygen in the upper tower and may precipitate in solid form. N2O is not a flammable and explosive component. The presence of N2O alone will not cause major safety accidents, but it has a high boiling point, low volatility, low solubility, and is a blocking component. Once N2O is precipitated in a solid state in the main cooling for some reason, it is very easy to form "dry evaporation" or "dead-end boiling" to form hydrocarbon aggregation, thus causing safety problems. In order to ensure the safe operation of the air separation unit, it is necessary to analyze the gas of the air separation unit through a gas analyzer. A gas analyzer or a gas analysis system is equivalent to a complete set of chemical process equipment. Therefore, the working process of the gas analysis instrument system is to realize a series of chemical processes. If you want to get accurate data through gas analysis, you must understand the situation and changes in each stage of this series of chemical processes, carefully study and master the laws, only in this way can you achieve the purpose of accurate measurement. If you encounter more complex and special process and technical conditions, then the chemical process reflected by the sample gas pretreatment system is still very complex, which is equivalent to the purification process of a small chemical plant. It can be seen that the process of gas analysis is to strictly control various factors that affect the measurement conditions under the premise of understanding and mastering the conditions of the entire chemical process system, so as to obtain accurate data required by process and management personnel. However, in the process of instrument application, there are many types of influencing factors and the changes are more complex. It is difficult to effectively control these influencing factors and eliminate the factors that interfere with the measurement, and the microscopic changes of gas components when flowing in pipelines and equipment are complex and changeable. There are many influencing factors that can be ignored in the analysis of constant gas components. However, they should not be ignored in the analysis of trace gas components. Instead, they must be taken seriously. At this point, these factors have become the main contradictions that affect the correct results of trace gas component analysis. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an analysis system for the impact of the process requirements of an air separation unit on the application of an analyzer. According to the process requirements of the air separation unit, the conditions that affect the accuracy of the gas analyzer in application are analyzed to improve the accuracy of the air detection results and provide technical support for the safe operation of the air separation unit.

[0005] In order to achieve the above technical objectives, the present application provides an analysis system for the impact of process requirements of an air separation unit on the application of an analyzer, including:

[0006] The process analysis module is used to obtain the main part, rare gas part and trace component part corresponding to different process requirements according to the process requirements of the air separation unit, and divide the trace component part into blocking component, combustible component and corrosion component;

[0007] The influencing factor analysis module is used to obtain the first factor affecting the detection accuracy of the gas analyzer based on the main part, the rare gas part and the trace component part; and to obtain the second factor affecting the detection accuracy of the gas analyzer based on the blocking component, the combustible component and the corrosion component; based on the first factor and the second factor, the application impact of the gas analyzer under different process requirements is analyzed, and then the results of the gas analyzer are corrected.

[0008] Preferably, the influencing factor analysis module is also used to obtain the first factor affecting the detection accuracy of the gas analyzer based on the types and contents of the main part, rare gas part and trace component part based on the acquired linear verification standard, error analysis standard and common quantitative analysis standard of the gas analyzer.

[0009] Preferably, the influencing factor analysis module is also used to obtain the second factor affecting the detection accuracy of the gas analyzer based on the blocking components, combustible components and corrosive components by repeatedly mixing the gas in the sampling pipeline, analyzing the physical and chemical effects between the pipe wall and the gas components, analyzing the pipeline material, obtaining the pipeline connection method and the pipeline cleanliness.

[0010] Preferably, the influencing factor analysis module is further used to obtain a first relationship between different process requirements according to an objective relationship between products produced by different process requirements;

[0011] According to the objective relationship between the trace components generated by different process requirements and the partial impact on the detection accuracy of the gas analyzer, the second relationship between different process requirements is obtained;

[0012] According to the first relationship and the second relationship, a third relationship between the effects of different process requirements on the detection accuracy of the gas analyzer is obtained, wherein the third relationship indicates an objective connection between factors when different process requirements affect the detection accuracy of the gas analyzer;

[0013] Based on the third relationship, according to the first factor and the second factor, the impact of different process requirements on the detection accuracy of the gas analyzer is analyzed.

[0014] Preferably, the influencing factor analysis module is also used to obtain the objective relationship between products produced by different process requirements based on the types and contents of the main part, rare gas part and trace component part corresponding to different process requirements.

[0015] Preferably, the influencing factor analysis module is also used to obtain the objective connection between the trace components generated by different process requirements and the detection accuracy of the gas analyzer according to the corresponding second factors of the blocking components, combustible components and corrosive components corresponding to different process requirements.

[0016] Preferably, the influencing factor analysis module is further used to correct the latter detection result of the gas analyzer based on the third relationship and in accordance with different process requirements for the two previous detections of the gas analyzer.

[0017] Preferably, the influencing factor analysis module is also used to obtain sampling points for gas inspection based on the first factor and the second factor according to a third relationship, wherein the sampling points include a first node that does not affect the detection accuracy and a second node that affects the detection accuracy, and the result of the gas detector is corrected through the first node and the result of the gas detector is corrected through the second node.

[0018] The present invention discloses the following technical effects:

[0019] The present invention improves the accuracy of the air analysis result of the air analyzer when the air separation device is running by analyzing the influence of the process of the air separation device on the air analyzer, thereby providing a guarantee for the safe operation of the air separation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the system structure of the present invention. DETAILED DESCRIPTION

[0022] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0023] like Figure 1 As shown, the present invention provides an analysis system for the influence of process requirements of an air separation unit on the application of an analyzer, comprising:

[0024] The process analysis module is used to obtain the main part, rare gas part and trace component part of the air separated by the air separation unit when the air separation unit separates the various components in the air according to the process requirements of the air separation unit, and divide the trace component part into blocking components, combustible components and corrosion components. Among them, the blocking components are: water, CO2 and N2O; the combustible components are: hydrocarbons (CH4, C2H2, C2H4, C2H6, C3H6, C3H8, etc.), ozone and nitrogen oxides (NO x ). The corrosive component may be a gas that is corrosive and chemically reactive to the air separation unit instruments and specific gases.

[0025] The influencing factor analysis module is used to analyze the gas analyzer based on the main part, the rare gas part and the trace component part according to the linear verification standard, the error analysis standard and the commonly used standard for quantitative analysis, so as to obtain the first factor affecting the detection accuracy of the gas analyzer; and obtain the second factor affecting the detection accuracy of the gas analyzer by repeatedly mixing the gas in the sampling pipeline, analyzing the physical and chemical effects between the pipe wall and the gas components, analyzing the pipeline material, and obtaining the pipeline connection method and the pipeline cleanliness. According to the first factor and the second factor, the application impact of the gas analyzer under different process requirements is analyzed, and then the results of the gas analyzer are corrected.

[0026] The influencing factor analysis module is also used to obtain the first factor affecting the detection accuracy of the gas analyzer based on the linear verification standard, error analysis standard and common quantitative analysis standard of the obtained gas analyzer, according to the type and content of the main part, the rare gas part and the trace component part, and to obtain the second factor affecting the detection accuracy of the gas analyzer by repeatedly mixing the gas in the sampling pipeline, analyzing the physical and chemical effects of the pipeline wall and the gas components, analyzing the pipeline material, obtaining the pipeline connection method and the pipeline cleanliness, based on the blocking component, the combustible component and the corrosive component.

[0027] The influencing factor analysis module is also used to obtain a first relationship between different process requirements based on the objective relationship between products generated by different process requirements; to obtain a second relationship between different process requirements based on the objective relationship that exists when trace components generated by different process requirements partially affect the detection accuracy of the gas analyzer; to obtain a third relationship between the influence of different process requirements on the detection accuracy of the gas analyzer based on the first relationship and the second relationship, wherein the third relationship indicates the objective relationship between the factors that exist when different process requirements affect the detection accuracy of the gas analyzer; based on the third relationship, analyze the influence of different process requirements on the detection accuracy of the gas analyzer based on the first factor and the second factor.

[0028] The influencing factor analysis module is also used to obtain the objective connection between products produced by different process requirements according to the types and contents of the main part, rare gas part and trace component part corresponding to different process requirements; according to the corresponding second factors of the blocking components, combustible components and corrosion components corresponding to different process requirements, the objective connection between the trace components produced by different process requirements and the impact on the detection accuracy of the gas analyzer is obtained.

[0029] The influencing factor analysis module is also used to correct the latter detection result of the gas analyzer based on the third relationship and according to different process requirements of the two previous detections of the gas analyzer.

[0030] The influencing factor analysis module is also used to obtain sampling points for gas detection based on the first factor and the second factor according to a third relationship, wherein the sampling points include a first node that does not affect the detection accuracy and a second node that affects the detection accuracy, and the result of the gas detector is corrected through the first node and the result of the gas detector is corrected through the second node.

[0031] Since many influencing factors can be ignored when analyzing the main part and the rare gas part, while many factors need to be considered when analyzing the trace component part, therefore, when designing the influencing factor analysis module of the system designed in the present invention, in-depth research is mainly carried out on the detection of the trace component part, that is, based on the process requirements, according to the blocking components, combustible components and corrosion components corresponding to the process requirements, combined with the main part and the rare gas part corresponding to the process requirements, the influencing factors that exist when the gas analyzer performs gas analysis under ideal conditions are summarized, in order to understand the combined gas formed by different process designs and its influence on the gas analyzer. At the same time, the detection of trace components is easily interfered by objective factors. The present invention analyzes the interference factors of trace components and finds that the changes in gas composition in the sampling pipeline, the physical and chemical effects between the pipe wall and the gas components, the pipe material, the pipe connection method and the cleanliness of the pipe are the main interference factors affecting the detection of trace components. Therefore, according to the analysis results of the interference factors of the trace components, the influencing factors affecting the detection of the trace components by the gas analyzer are obtained. Thus, combined with the influencing factors under the ideal state, the analysis results of the influence on the application of the gas analyzer under different process requirements are obtained. According to different process requirements, the detection results of the gas analyzer are corrected to objectively reflect the composition and content of the gas generated by the air separation device in the actual process, especially the composition and content of the trace components, which provides technical guarantee for the safe operation of the air separation device. Among them, for example: when using an air analyzer to measure trace oxygen, not only the system material and sealing must be strictly controlled, but also many factors such as the cleanliness of the system must be solved one by one, otherwise, the oxygen component analysis will not obtain accurate measurement results. In addition to considering the various influencing factors mentioned above, the determination of trace water content in the gas must also take into account the adsorption equilibrium of water in the sample gas in the pipeline. The proper handling of this problem must rely on repeated experiments, understanding its changes and laws, and mastering the operating techniques in order to obtain accurate results.

[0032] In addition to the analytical design mentioned above, the following points should be achieved for the detection accuracy of the instrument:

[0033] (1) Verification of the linear relationship of the instrument. First of all, to ensure the normal operation of the instrument, the analytical instrument, as a kind of measuring instrument, must be tested by the authoritative measurement department in accordance with the regulations every year before it can be used. At the same time, it is also necessary to use a series of standard gases every year to check whether the linear relationship of the instrument in the entire linear range remains normal. Otherwise, blindly believing in the integrity of the analytical instrument (even if it is an imported instrument) will definitely result in erroneous data and lead to mistakes in production management and quality management.

[0034] (2) Error analysis. In the application process of analytical instruments, error analysis must be conducted for each measurement result to determine the authenticity, reliability and credibility of the data analysis. Generally, after the measurement result is obtained, after error analysis, when it is determined that the sum of the errors of the analysis data is less than the specified allowable error, this data (or a group of data) will be reported or published as the correct measurement result. Otherwise, inaccurate data will bring serious adverse consequences to production managers.

[0035] (3) Instrument calibration commonly used in quantitative analysis. As a quantitative analysis instrument, the gas analyzer must be calibrated (or calibrated) with standard gas before quantitative analysis. Standard gas is generally purchased from the metrology department or legal factory. Under special circumstances, it can also be configured by yourself (but you must have the qualifications and ability to configure standard gas and related equipment). The shelf life of standard gas is one year. When using standard gas to calibrate analytical instruments, you must also have a deep understanding of the normal procedures and usage rules. If you purchase and use standard gas that does not meet the requirements, it will lead to a huge deviation in the analysis data. If you do not understand the requirements for the use of standard gas, it will also cause trouble to air separation production because you cannot obtain accurate data results.

[0036] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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.

[0037] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An analysis system for the impact of process requirements of air separation units on analyzer applications, characterized in that: include: The process analysis module is used to obtain the main part, rare gas part and trace component part corresponding to different process requirements according to the process requirements of the air separation unit, and divide the trace component part into blocking component, combustible component and corrosion component; The influencing factor analysis module is used to obtain a first factor affecting the detection accuracy of the gas analyzer based on the main part, the rare gas part and the trace component part; and to obtain a second factor affecting the detection accuracy of the gas analyzer based on the blocking component, the combustible component and the corrosive component; based on the first factor and the second factor, analyze the impact on the application of the gas analyzer under different process requirements, and then correct the results of the gas analyzer.

2. The analysis system for the influence of process requirements of air separation unit on the application of analyzer according to claim 1, characterized in that: The influencing factor analysis module is also used to obtain the first factor affecting the detection accuracy of the gas analyzer based on the types and contents of the main part, the rare gas part and the trace component part, based on the linear verification standard, error analysis standard and common quantitative analysis standard of the gas analyzer.

3. The analysis system for the influence of process requirements of air separation unit on the application of analyzer according to claim 2, characterized in that: The influencing factor analysis module is also used to obtain the second factor affecting the detection accuracy of the gas analyzer based on the blocking component, the combustible component and the corrosive component by repeatedly mixing the gas in the sampling pipeline, analyzing the physical and chemical effects between the pipe wall and the gas components, analyzing the pipeline material, and obtaining the pipeline connection method and the pipeline cleanliness.

4. The analysis system for the influence of process requirements of air separation unit on the application of analyzer according to claim 3, characterized in that: The influencing factor analysis module is further used to obtain a first relationship between different process requirements based on the objective relationship between products generated by different process requirements; According to the objective relationship between the trace components generated by different process requirements and the partial impact on the detection accuracy of the gas analyzer, the second relationship between different process requirements is obtained; According to the first relationship and the second relationship, a third relationship between the effects of different process requirements on the detection accuracy of the gas analyzer is obtained, wherein the third relationship indicates an objective connection between factors when different process requirements affect the detection accuracy of the gas analyzer; Based on the third relationship, according to the first factor and the second factor, the impact of different process requirements on the detection accuracy of the gas analyzer is analyzed.

5. The analysis system for the influence of process requirements of air separation unit on the application of analyzer according to claim 4, characterized in that: The influencing factor analysis module is also used to obtain the objective relationship between products produced by different process requirements based on the types and contents of the main part, the rare gas part and the trace component part corresponding to different process requirements.

6. The analysis system for the influence of process requirements of air separation unit on the application of analyzer according to claim 5, characterized in that: The influencing factor analysis module is also used to obtain the objective connection between the trace components generated by different process requirements and the detection accuracy of the gas analyzer based on the second factors corresponding to the blocking components, the combustible components and the corrosive components corresponding to different process requirements.

7. The analysis system for the influence of process requirements of air separation unit on the application of analyzer according to claim 6, characterized in that: The influencing factor analysis module is further used to correct the latter detection result of the gas analyzer based on the third relationship and according to different process requirements of the two previous detections of the gas analyzer.

8. The analysis system for the influence of process requirements of air separation unit on the application of analyzer according to claim 7, characterized in that: The influencing factor analysis module is also used to obtain sampling points for gas inspection based on the first factor and the second factor according to the third relationship, wherein the sampling points include a first node that does not affect the detection accuracy and a second node that affects the detection accuracy, and the result of the gas detector is corrected through the first node and the result of the gas detector is corrected through the second node.

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