A method and system for identifying and correcting faults of an oil chromatography online device based on precise control of gas resistance of a chromatography column

Abstract

The present invention discloses a method and system for identifying and correcting faults of an oil chromatography online device based on precise control of the gas resistance of a chromatography column. The method comprises obtaining an oil chromatography chromatogram; determining the position and size of a peak in the chromatogram by taking a second-order derivative of the chromatogram and finding an extreme point; judging whether the chromatogram is abnormal according to the position and size of the peak; obtaining the retention time in the case of abnormality; judging whether the retention time is valid; sending an alarm reminder in the case of judging that the retention time is valid; calculating the gas resistance value using the following calculation formula in the case of judging that the retention time is invalid; determining an adjustment ratio parameter according to the gas resistance value, and determining an adjustment mode according to the retention time; adjusting the gas resistance value of the chromatography column using the adjustment ratio parameter and the adjustment mode. The scheme of the present invention accurately calculates and controls the gas resistance value of the chromatography column through real-time data, can correct data misjudgment caused by peak deviation or peak overlap due to changes in retention time, and automatically calibrates the oil chromatography monitoring data.

Description

Technical Field

[0001] The present invention relates to the technical field of oil chromatography online monitoring device fault identification and correction, and in particular to an oil chromatography online device fault identification and correction method and system based on precise control of chromatographic column gas resistance. Background Art

[0002] Oil chromatography online monitoring devices are widely used in power systems, but false alarms still occur frequently, resulting in incorrect judgments of the operating status of the monitoring equipment. For example, a UHV transformer equipped with an oil chromatography online monitoring device gave a false alarm, causing the equipment to stop operating and resulting in huge economic losses. Therefore, the authenticity and reliability of the device monitoring data is crucial to accurately judge the operating status of the equipment. At present, the monitoring devices on the market only have simple self-test and error reporting functions for the carrier gas module, oil-gas separation module, control module, etc. There is no effective identification function and correction method for data misjudgment caused by peak distortion or peak overlap caused by changes in chromatographic peak retention time and the actual status of the chromatographic column. Therefore, in response to the above problems, it is urgent to develop a more advanced oil chromatography online device fault identification and correction system that can realize real-time monitoring and automatic calibration of abnormal data to more accurately judge the actual operating status of the monitored equipment. Summary of the invention

[0003] In order to solve the technical problem of data misjudgment caused by peak distortion or peak overlap due to changes in chromatographic peak retention time, the embodiment of the present invention provides a method and system for identifying and correcting faults of an oil chromatography online device based on precise control of chromatographic column gas resistance.

[0004] The technical solution of the embodiment of the present invention is achieved as follows:

[0005] The embodiment of the present invention provides a method for identifying and correcting faults of an oil chromatography online device based on precise control of gas resistance of a chromatographic column, the method comprising: obtaining an oil chromatography chromatogram; determining the position and size of a peak in the chromatogram by taking a second-order derivative of the chromatogram and finding an extreme point; judging whether the chromatogram is abnormal according to the position and size of the peak; obtaining a retention time when judging that the chromatogram is abnormal; judging whether the retention time is valid; sending an alarm reminder when judging that the retention time is valid; calculating a gas resistance value when judging that the retention time is invalid; determining an adjustment ratio parameter according to the gas resistance value, and determining an adjustment mode according to the retention time; adjusting the gas resistance value of the chromatographic column using the adjustment ratio parameter and the adjustment mode;

[0006] Wherein, determining the adjustment mode according to the retention time includes:

[0007] If the retention time is greater than the retention time threshold, the adjustment mode is shrinking;

[0008] If the retention time is less than or equal to the retention time threshold, the adjustment mode is amplification;

[0009] Wherein, determining the adjustment ratio parameter according to the air resistance value includes:

[0010] According to the air resistance value, querying a preset mapping relationship table of air resistance values ​​and adjustment proportional factors to obtain a corresponding adjustment proportional factor;

[0011] Use the following calculation formula to determine the adjustment ratio parameter of the air resistance value:

[0012] △R=L / α;

[0013] Among them, △R represents the adjustment ratio parameter of the air resistance value, L is the proportional valve adjustment parameter, and α represents the adjustment ratio factor.

[0014] In one embodiment, the position and size of the peak in the chromatogram are determined by taking a second-order derivative of the chromatogram and finding extreme points, including: obtaining chromatographic data from the chromatogram; the chromatographic data includes the relationship between concentration and time; taking a first-order derivative of the chromatographic data to obtain a first-order derivative; determining the rising and falling parts of the peak in the chromatographic data based on the first-order derivative; taking a second-order derivative based on the first-order derivative to obtain a second-order derivative; and determining the position and size of the peak in the chromatographic data based on the second-order derivative.

[0015] In one embodiment, performing a first-order derivative on the chromatographic data to obtain a first-order derivative includes: performing a first-order derivative on the chromatographic data using the following calculation formula to obtain a first-order derivative:

[0016] ;

[0017] Where D is the first-order derivative, which represents the rate of change of the signal over time; y(t+Δt) is the chromatographic concentration at time t+Δt;

[0018] y(t-Δt) is the chromatographic concentration at time t-Δt; Δt is the time interval between signal points.

[0019] In one embodiment, performing a second-order derivative to obtain a second-order derivative includes:

[0020] Use the following calculation formula to perform the second-order derivative and obtain the second-order derivative:

[0021] ;

[0022] in, is the second-order derivative, which represents the rate of change of the first-order derivative over time; D(t+Δt) is the first-order derivative at time t+Δt; D(t-Δt) is the first-order derivative at time t-Δt; Δt is the time interval between signal points.

[0023] In one embodiment, determining whether the retention time is valid includes: obtaining a retention time threshold range, and determining whether the retention time is within the retention time threshold range; if the retention time is within the retention time threshold range, the retention time is valid; if the retention time is not within the retention time threshold range, the retention time is invalid.

[0024] In one embodiment, the air resistance value is calculated using the following formula:

[0025] ;

[0026] Wherein, T represents the gas resistance of the chromatographic column, P1 represents the pressure before the column, P2 represents the atmospheric pressure, and V represents the carrier gas flow rate.

[0027] An embodiment of the present invention also provides an oil chromatography online device fault identification and correction system based on precise control of chromatographic column gas resistance, the system comprising: a carrier gas module, an oil-gas separation module, an electronic flow controller, a chromatographic separation module, a pressure sensor, a temperature sensor, a data acquisition module, a data correction module and a host computer device; the host computer device is used to execute the steps of the above-mentioned method.

[0028] In one embodiment, the carrier gas module is used to output oil-free air; the oil-gas separation module is used to separate the soluble gas in the oil from the oil; the electronic flow controller is used to control the gas flow in the chromatographic column; the chromatographic separation module is used to perform chromatographic separation; the pressure sensor is used to measure the pressure in front of the chromatographic column; the temperature sensor is used to measure the temperature; the data acquisition module is used to collect data; and the data correction module is used to store the calculation formula of the gas resistance of the chromatographic column.

[0029] The method and system for identifying and correcting faults of an oil chromatography online device based on precise control of gas resistance of a chromatography column provided in an embodiment of the present invention obtains an oil chromatography chromatogram; determines the position and size of the peak in the chromatogram by taking the second-order derivative of the chromatogram and finding the extreme point; determines whether the chromatogram is abnormal according to the position and size of the peak; obtains the retention time when the chromatogram is judged to be abnormal; determines whether the retention time is valid; sends an alarm reminder when the retention time is judged to be valid; calculates the gas resistance value when the retention time is judged to be invalid; determines the adjustment ratio parameter according to the gas resistance value, and determines the adjustment mode according to the retention time; and adjusts the oil chromatography using the adjustment ratio parameter and the adjustment mode. The solution provided by the present invention accurately calculates and controls the gas resistance value of the chromatography column through real-time data, can correct data misjudgment caused by peak deviation or peak overlap due to changes in retention time, and automatically calibrates the oil chromatography monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of a method for fault identification and correction of an oil chromatography online device based on precise control of gas resistance of a chromatography column according to an embodiment of the present invention;

[0031] Figure 2 It is a structural schematic diagram of an application system of a method for identifying and correcting faults of an oil chromatography online device based on precise control of gas resistance of a chromatography column according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the system flow of an embodiment of the present invention;

[0033] Figure 4 1 is a diagram showing the internal structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0035] The embodiment of the present invention provides a method for identifying and correcting faults of an oil chromatography online device based on precise control of the gas resistance of a chromatography column, such as Figure 1 As shown, the method includes:

[0036] Step 101: Obtaining an oil chromatography chromatogram;

[0037] Step 102: Determine the position and size of the peak in the chromatogram by taking the second-order derivative of the chromatogram and finding the extreme point; and determine whether the chromatogram is abnormal according to the position and size of the peak;

[0038] In the case where the chromatogram is judged to be abnormal, step 103 is performed: obtaining the retention time; judging whether the retention time is valid;

[0039] If it is determined that the retention time is valid, executing step 104: sending an alarm reminder;

[0040] When it is determined that the retention time is invalid, step 105 is performed: calculating the air resistance value; determining an adjustment ratio parameter according to the air resistance value, and determining an adjustment mode according to the retention time; and adjusting the air resistance value of the chromatographic column using the adjustment ratio parameter and the adjustment mode.

[0041] The gas resistance value of the chromatographic column in the oil chromatography online device has a great influence on the peak separation effect. The increase or decrease of the gas resistance value will affect the peak separation effect and change its retention time, resulting in peak distortion or peak overlap, and causing misjudgment of data results. Therefore, in actual monitoring, the ability to accurately control the gas resistance value in real time is the key to ensuring the separation effect and accurate analysis results.

[0042] Specifically, see Figure 2 , Figure 2 The system structure diagram to which the present embodiment is applied includes a carrier gas module, an oil-gas separation module, an electronic flow controller, a chromatographic separation module, a pressure sensor, a temperature sensor, a data acquisition module, a data correction module and a host computer device.

[0043] The host computer device is respectively connected to the carrier gas module, oil-gas separation module, chromatographic separation module, data acquisition module, and data correction module, so as to facilitate real-time viewing of the operating status of each module.

[0044] The carrier gas module is connected to the oil-gas separation module. The carrier gas module is a zero-level air generator that can output oil-free air above 0.4MPa. The oil-gas separation module is used to separate the soluble gas in the oil from the oil.

[0045] The electronic flow controller includes a proportional valve, a flow sensor and a control circuit; the proportional valve can control the flow rate, that is, adjust the proportional solenoid output force of the proportional valve and move the position of the valve core proportionally to change the gas flow entering the chromatographic column. The flow sensor is used to monitor the gas flow in front of the chromatographic column.

[0046] The pressure sensor is used to accurately measure the pressure in front of the chromatographic column. The gas resistance value is calibrated by accurately calculating and adjusting the flow rate in the chromatographic column through real-time data, so that the pressure in front of the chromatographic column remains unchanged.

[0047] The chromatographic separation module is a single injection, dual-column parallel mode, and an electronic flow controller and a pressure sensor are connected in front of the chromatographic column 1 and the chromatographic column 2. The chromatographic column 1 is a carbon molecular sieve column, and the filler is TDX-01; the chromatographic column 2 is a Haysep column, and the filler is Haysep N+Haysep D, and the filling ratio of Haysep N to Haysep D is 3:7.

[0048] The data acquisition module collects pressure sensor data, temperature sensor data, and oil chromatogram waveform data. The data acquisition module exchanges data with the host computer and provides the host computer with parameter information such as oil chromatogram waveform data and retention time threshold.

[0049] The data correction module is embedded with a calculation formula for the gas resistance of the chromatographic column, that is, in the constant flow mode, the corresponding gas resistance value is calculated by the difference between the column front pressure and the atmospheric pressure / carrier gas flow rate.

[0050] The data correction module is connected to the electronic flow controller and the temperature sensor respectively, and is used to calculate the gas resistance value of the chromatographic column; a mapping relationship between the gas resistance value of the chromatographic column and the monitoring data is established in the data correction module, and the gas resistance threshold R1 and the gas resistance threshold R2 are set. When R1≤R≤R2, the gas resistance value is valid.

[0051] In addition, the system may also include a control and alarm module, which is respectively connected to the column oven, flow sensor, pressure sensor, data acquisition and calculation module, data correction module and host computer device. The control and alarm module is used to monitor the temperature control accuracy of the column oven, the data of the carrier gas flow rate, the data of the pressure sensor, and to issue an early warning when an abnormal chromatographic peak occurs when the chromatographic column is in normal working condition.

[0052] After introducing the above system structure, see Figure 3 , the method of this embodiment will be introduced below.

[0053] Specifically, the fault identification and correction process involved in this embodiment includes abnormal oil chromatogram detection, retention time range determination, chromatographic column gas resistance calculation and validity determination, and proportional valve adjustment, etc. Specifically including:

[0054] 1. The host computer sends a command to obtain the retention time threshold to the data acquisition module, and the data acquisition module returns the retention time threshold;

[0055] 2. The host computer collects oil chromatogram waveform data regularly, the host computer sends a command to obtain oil chromatogram waveform data, and the data acquisition module returns the oil chromatogram waveform data;

[0056] 3. The host computer determines the position and size of the peak by calculating the second-order derivative of the chromatogram and finding its extreme point. When there are two extreme points with the same peak top position, the waveform spectrum is judged to be abnormal;

[0057] The specific process is as follows:

[0058] (1) Obtaining chromatographic data. First, obtain the chromatogram data to be analyzed, including the relationship between concentration (signal) and time.

[0059] (2) Calculate the first-order derivative. Calculate the first-order derivative of the chromatographic signal. The first-order derivative can be used to identify the rising and falling parts of the peak and help determine the location of the peak:

[0060] ;

[0061] D: first-order derivative, which indicates the rate of change of the signal over time;

[0062] y(t+Δt): chromatographic concentration at time t+Δt;

[0063] y(t-Δt): chromatographic concentration at time t-Δt;

[0064] Δt: signal point time interval.

[0065] (3) Calculate the second-order derivative. Further calculate the derivative of the first-order derivative, that is, the second-order derivative. The second-order derivative can reveal the concave and convex nature of the peak, especially when the peaks overlap, the value of the second-order derivative will change significantly:

[0066] ;

[0067] : The second-order derivative represents the rate of change of the first-order derivative over time;

[0068] D(t+Δt): first-order derivative at time t+Δt;

[0069] D(t-Δt): first-order derivative at time t-Δt;

[0070] Δt: signal point time interval.

[0071] (4) Peak identification. In the second-order derivative graph, the change of the peak will appear as a zero-crossing point (i.e., the point where the second-order derivative changes from positive to negative or from negative to positive). These zero-crossing points correspond to the tops of the peaks in the chromatogram.

[0072] (5) Determine overlap. If there are multiple zero-crossing points in the second-order derivative graph and these points are very close, then it can be determined that there is peak overlap in the original chromatogram. Usually, the second-order derivative graph of overlapping peaks will show multiple adjacent zero-crossing points, while a single peak usually has only one zero-crossing point.

[0073] 4. When judging that the spectrum is abnormal, obtain the retention time threshold range parameter (such as 10%) configured by the system. If the retention time is within the threshold range, it is valid. If it is valid, an alarm will be issued, otherwise proceed to the next step;

[0074] 5. The host computer requests the data modification module to initiate the calculation of the gas resistance value of the chromatographic column. If the gas resistance value is between the gas resistance threshold R1 and the gas resistance threshold R2, it is valid and the gas resistance validity judgment result is returned;

[0075] The calculation formula of gas resistance value: gas resistance value of chromatographic column = difference between column front pressure and atmospheric pressure / carrier gas flow rate;

[0076] 6. When the host computer obtains the effective air resistance value, it obtains the adjustment proportional factor configured by the system. If the retention time is greater than the retention time threshold, the adjustment mode parameter is configured to reduce, otherwise it is to enlarge. The host computer sends a command to adjust the proportional valve, which includes the adjustment proportional factor, adjustment parameters and adjustment mode parameters. When the proportional valve adjustment is completed, the execution result is returned.

[0077] The relationship between the air resistance adjustment value and the proportional valve adjustment parameter: △R=L / α;

[0078] Among them, L is the proportional valve adjustment parameter, α represents the adjustment proportional factor, and △R represents the adjustment proportional parameter of R.

[0079] 7. The host computer verifies the waveform spectrum after adjustment.

[0080] The solution provided by the present invention accurately calculates and controls the gas resistance value of the chromatographic column through real-time data, can correct data misjudgment caused by peak deviation or peak overlap due to retention time changes, and automatically calibrates oil chromatography monitoring data.

[0081] In order to implement the method of the embodiment of the present invention, the embodiment of the present invention also provides an oil chromatography online device fault identification and correction system based on precise control of the gas resistance of the chromatographic column, the system including: a carrier gas module, an oil and gas separation module, an electronic flow controller, a chromatographic separation module, a pressure sensor, a temperature sensor, a data acquisition module, a data correction module and a host computer device; the host computer device is used to execute the steps of the above-mentioned method.

[0082] In one embodiment, the carrier gas module is used to output oil-free air; the oil-gas separation module is used to separate the soluble gas in the oil from the oil; the electronic flow controller is used to control the gas flow in the chromatographic column; the chromatographic separation module is used to perform chromatographic separation; the pressure sensor is used to measure the pressure in front of the chromatographic column; the temperature sensor is used to measure the temperature; the data acquisition module is used to collect data; and the data correction module is used to store the calculation formula of the gas resistance of the chromatographic column.

[0083] The above-mentioned system provided in this embodiment belongs to the same concept as the above-mentioned method embodiment. The specific implementation process thereof is detailed in the method embodiment and will not be repeated here.

[0084] In order to implement the method of the embodiment of the present invention, the embodiment of the present invention also provides a computer program product, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps of the above method.

[0085] Based on the hardware implementation of the above program modules, and in order to implement the method of the embodiment of the present invention, the embodiment of the present invention further provides an electronic device (computer device). Specifically, in one embodiment, the computer device may be a terminal, and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05 and a memory (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A06. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor A01, the method of any one of the above embodiments is implemented. The display screen A04 of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device A05 of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0086] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0087] The device provided by an embodiment of the present invention includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the method of any one of the above embodiments is implemented.

[0088] 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 adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt 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.

[0089] 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 the 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 generate 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.

[0090] 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.

[0091] 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 in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0092] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0093] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0094] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0095] It can be understood that the memory of the embodiment of the present invention can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), and direct RAMbus random access memory (DRRAM, Direct Rambus Random Access Memory).The memories described in the embodiments of the present invention are intended to include, but are not limited to, these and any other suitable types of memories.

[0096] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0097] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for identifying and correcting faults of an oil chromatography online device based on precise control of the gas resistance of a chromatography column, characterized in that: The method comprises: Obtain oil chromatography chromatogram; Determine the position and size of the peak in the chromatogram by taking a second-order derivative of the chromatogram and finding an extreme point; and determine whether the chromatogram is abnormal according to the position and size of the peak; In the case where the chromatogram is judged to be abnormal, obtaining the retention time; and judging whether the retention time is valid; When it is determined that the retention time is valid, an alarm reminder is sent; In the case where the retention time is judged to be invalid, the gas resistance value is calculated; an adjustment ratio parameter is determined according to the gas resistance value, and an adjustment mode is determined according to the retention time; and the gas resistance value of the chromatographic column is adjusted using the adjustment ratio parameter and the adjustment mode; Wherein, determining the adjustment mode according to the retention time includes: If the retention time is greater than the retention time threshold, the adjustment mode is shrinking; If the retention time is less than or equal to the retention time threshold, the adjustment mode is amplification; Wherein, determining the adjustment ratio parameter according to the air resistance value includes: According to the air resistance value, querying a preset mapping relationship table of air resistance values ​​and adjustment proportional factors to obtain a corresponding adjustment proportional factor; Use the following calculation formula to determine the adjustment ratio parameter of the air resistance value: △R=L / α; Among them, △R represents the adjustment ratio parameter of the air resistance value, L is the proportional valve adjustment parameter, and α represents the adjustment ratio factor; Among them, the air resistance value is calculated using the following calculation formula: ; Wherein, T represents the gas resistance of the chromatographic column, P1 represents the pressure before the column, P2 represents the atmospheric pressure, and V represents the carrier gas flow rate.

2. The method for fault identification and correction of an oil chromatography online device based on precise control of chromatographic column gas resistance according to claim 1, characterized in that: Determining the position and size of the peak in the chromatogram by taking a second-order derivative of the chromatogram and finding an extreme point includes: Acquire chromatographic data from the chromatogram; the chromatographic data includes the relationship between concentration and time; Taking a first-order derivative of the chromatographic data to obtain a first-order derivative; determining ascending and descending portions of a peak in the chromatographic data based on the first-order derivative; Based on the first-order derivative, a second-order derivative is obtained to obtain a second-order derivative; and the position and size of the peak in the chromatographic data are determined according to the second-order derivative.

3. The method for fault identification and correction of an oil chromatography online device based on precise control of chromatographic column gas resistance according to claim 2, characterized in that: Taking a first-order derivative of the chromatographic data to obtain a first-order derivative comprises: The chromatographic data is first-order derived using the following calculation formula to obtain the first-order derivative: ； Where D is the first-order derivative, which represents the rate of change of the signal over time; y(t+Δt) is the chromatographic concentration at time t+Δt; y(t-Δt) is the chromatographic concentration at time t-Δt; Δt is the time interval between signal points.

4. The method for fault identification and correction of an oil chromatography online device based on precise control of chromatographic column gas resistance according to claim 2, characterized in that: Perform second-order derivatives to obtain second-order derivatives, including: Use the following calculation formula to perform the second-order derivative and obtain the second-order derivative: ； in, is the second-order derivative, which represents the rate of change of the first-order derivative over time; D(t+Δt) is the first-order derivative at time t+Δt; D(t-Δt) is the first-order derivative at time t-Δt; Δt is the time interval between signal points.

5. The method for fault identification and correction of an oil chromatography online device based on precise control of chromatographic column gas resistance according to claim 1, characterized in that: Determining whether the retention time is valid includes: Obtaining a retention time threshold range, and determining whether the retention time is within the retention time threshold range; If the retention time is within the retention time threshold range, the retention time is valid; If the retention time is not within the retention time threshold range, the retention time is invalid.

6. A fault identification and correction system for oil chromatography online device based on precise control of chromatographic column gas resistance, characterized in that: The system includes: a carrier gas module, an oil-gas separation module, an electronic flow controller, a chromatographic separation module, a pressure sensor, a temperature sensor, a data acquisition module, a data correction module and a host computer device; the host computer device is used to execute the steps of the method described in any one of claims 1 to 5.

7. The oil chromatography online device fault identification and correction system based on precise control of chromatographic column gas resistance according to claim 6 is characterized by: The carrier gas module is used to output oil-free air; The oil-gas separation module is used to separate the soluble gas in the oil from the oil; The electronic flow controller is used to control the gas flow in the chromatographic column; The chromatographic separation module is used to perform chromatographic separation; The pressure sensor is used to measure the pressure before the chromatographic column; The temperature sensor is used to measure temperature; The data acquisition module is used to collect data; The data correction module is used to store the calculation formula of the gas resistance of the chromatographic column.

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