A method for troubleshooting pressure measurement abnormality of a gas turbine

Abstract

This invention relates to a method for troubleshooting abnormal pressure measurements in gas turbines. The method divides the troubleshooting process into a static commissioning phase and a dynamic testing phase. In the static commissioning phase, the pressure measurement system is gradually pressurized using a pressure calibrator. Based on pressure changes and data acquisition status during the pressurization process, hardware faults are categorized into pipe leaks, pipe blockages or bends, scanning valve communication abnormalities, and data acquisition software faults. In the dynamic testing phase, after the operating conditions stabilize, stability assessment and Q-test outlier removal are performed on the measurement data to achieve systematic identification of abnormal data. After shutdown, the abnormalities discovered during the dynamic testing are verified and confirmed through static commissioning. This invention uses fault phenomena as a guide for categorized troubleshooting, enabling precise location of the root cause of various abnormalities in the pressure measurement system. It is applicable to both positive and negative pressure measurement systems.

Description

Technical Field

[0001] This invention relates to the field of gas turbine performance testing technology, and in particular to a method for troubleshooting abnormal pressure measurements in gas turbines. Background Technology

[0002] In gas turbine performance testing, pressure measurement is the core method for obtaining aerodynamic parameters of components such as the compressor, combustion chamber, and turbine. A typical pressure measurement system consists of a pressure probe, connecting pipelines (including pressure-sensing rigid pipes and pressure-sensing flexible pipes), a pressure scanning valve, and a data acquisition system. Each measuring point transmits pressure signals to the scanning valve through independent pipelines, and after acquisition, the signals are transmitted to the data acquisition system for recording.

[0003] In practical engineering applications, this measurement system has the following technical problems: First, the measurement process involves multiple steps and complex fault types, making localization difficult. The measurement system comprises probes, long-distance connecting pipelines (including multiple connectors), scanning valves, communication lines, and data acquisition software. A fault in any of these components can lead to measurement anomalies. Pipeline leaks can cause systematically low measurement values; pipe blockages or bends can also distort data; scanning valve communication failures manifest as no data output; and data acquisition software malfunctions can cause data fluctuations. While these faults manifest differently at the data acquisition end, they also overlap. Existing troubleshooting methods are mostly isolated detection techniques targeting single fault types, lacking a systematic, symptom-oriented, categorized troubleshooting process. When faced with measurement anomalies, operators struggle to quickly determine the starting point and direction of the investigation, resulting in lengthy troubleshooting cycles and a heavy workload.

[0004] Second, there is a lack of objective standards for removing outlier data during dynamic testing. During dynamic testing of gas turbines, factors such as pipeline vibration and temperature changes can cause unstable or outlier data at some measuring points. Current technologies rely heavily on the subjective experience of operators to identify and remove such outliers, lacking unified statistical standards. This results in inconsistent data processing results with poor repeatability, directly impacting the accuracy of calculations for key performance parameters such as compressor pressure ratio and surge margin.

[0005] Third, there is a lack of effective connection between anomalies discovered during dynamic testing and static troubleshooting during shutdown. The root cause of data anomalies observed during dynamic testing may be any of the following: pipeline leakage, pipeline blockage, scanning valve failure, or software problem. However, existing technologies lack a systematic verification method to trace dynamic anomalies back to static hardware faults, making it difficult to confirm the root cause of the fault.

[0006] Therefore, there is an urgent need in this field for a method to troubleshoot gas turbine pressure measurement anomalies that can classify fault phenomena and systematically troubleshoot step by step. Summary of the Invention

[0007] In response to the shortcomings of the existing production technology, the applicant provides a method for troubleshooting abnormal pressure measurements in gas turbines. This method is guided by fault symptoms and divides the troubleshooting process into a static debugging stage and a dynamic testing stage. By classifying and troubleshooting, it achieves precise location of various abnormalities in the measurement system.

[0008] The technical solution adopted in this invention is as follows: A method for troubleshooting abnormal pressure measurement in a gas turbine, wherein the method targets a pressure measurement system comprising a pressure tapping connector, a pressure tapping rigid pipe, a pressure tapping flexible pipe, a pressure scanning valve connector, a pressure scanning valve, and a data acquisition system connected to the pressure scanning valve via a communication line. The troubleshooting methods include troubleshooting steps during the static debugging phase, troubleshooting steps during the dynamic testing phase, and verification and confirmation steps. Static commissioning phase troubleshooting steps: With the gas turbine shut down, apply standard gas pressure to the pressure measurement system for a pressure test. Based on the pressure change characteristics and data acquisition status during the pressure test, classify the faults into pipeline leakage faults, pipeline blockage or bending faults, scanning valve communication faults, and data acquisition software faults. Dynamic testing phase troubleshooting steps: Under the operating conditions of the gas turbine, the validity of the measurement data is judged, unstable data is eliminated through stability judgment, and outliers are statistically judged and eliminated through Q test; Verification and confirmation steps: For the test points corresponding to the abnormal data found in the dynamic testing phase, after shutdown, the verification is carried out through the troubleshooting steps in the static debugging phase to determine the root cause of the abnormality.

[0009] Its further technical solution lies in: The specific troubleshooting steps during the static debugging phase include: Connect the pressure calibrator to the pipeline input of the pressure measurement system, apply standard air pressure to perform a pressure test, and observe whether the value displayed by the data acquisition system is consistent with the standard air pressure. If the pressure calibrator fails to reach the set value during the pressure test, it is determined to be a pipeline leak fault, and the sealing and integrity of the pipeline are checked. When the pressure calibrator reaches the set value and remains stable during the pressurization process, but the data acquisition system displays an abnormality, the following situations should be distinguished for fault location: Scenario 1: If the data acquisition system displays no data, disconnect the pipeline from the scanning valve. If the pressure of the pressure calibrator remains unchanged, the problem is determined to be a pipeline blockage or bend. If the pressure of the pressure calibrator drops rapidly, the pipeline problem is ruled out, and the problem is determined to be a scanning valve communication failure. Scenario 2: If the data acquisition system displays unstable or fluctuating data, it is determined to be a fault in the scanning valve or the data acquisition software.

[0010] The specific troubleshooting steps during the dynamic testing phase include: After the operating conditions stabilize, a set of measurement data is collected, the data at each measuring point are compared, and unstable data that fluctuates back and forth is eliminated. Outlier detection is performed on the remaining data. The data are arranged from smallest to largest as X1≤X2≤X3≤X4≤X5. The statistic Q=(X2-X1) / (X5-X1) is calculated, and a critical value Q0 with a confidence level of 95% is set. 95 =0.710. When Q>0.710, X1 is determined to be an outlier and is removed. The average of the remaining data is used for subsequent performance calculations. Record the measurement points that exhibit unstable data or outliers as abnormal measurement points in dynamic testing.

[0011] The pressure test adopts a step-by-step pressure increase method, applying standard air pressures corresponding to 20%, 40%, 60%, 80%, and 100% of the range in sequence. The displayed values ​​of the data acquisition system are recorded at each pressure point and compared with the corresponding standard air pressures.

[0012] During the static commissioning phase troubleshooting steps, the following fault types are distinguished through a single pressure test operation: Leakage caused by poor sealing at pipe connections or pipe damage corresponds to the phenomenon that the pressure calibrator cannot reach the set value during the pressure test. A flow failure caused by pipe bends or blockage by foreign objects corresponds to the phenomenon that the pressure of the pressure calibrator remains unchanged after disconnecting the pipe from the scanning valve; The no-data fault caused by abnormal communication between the scanning valve and the data acquisition system corresponds to the phenomenon that the pressure of the pressure calibrator drops rapidly after disconnecting the pipeline from the scanning valve. Data fluctuation faults caused by abnormal operation of the data acquisition system software correspond to the phenomenon that the pressure of the pressure calibrator is stable, but the data acquisition system displays fluctuations.

[0013] In the dynamic testing phase, different criteria are used to distinguish between unstable data and outliers: the criterion for unstable data is that the data fluctuation at the same measuring point exceeds the stable range within a predetermined time after the operating conditions stabilize; the criterion for outliers is that the Q test statistic exceeds the critical value Q0 corresponding to a 95% confidence level. 95 =0.710.

[0014] The verification and confirmation steps include: for abnormal test points recorded during the dynamic testing phase, after shutdown, perform static pressure testing on the pipeline and scanning valve channel corresponding to the test point. If the pressure of the pressure calibrator cannot reach the set value during the pressure test, it is confirmed that there is a pipeline leak or damage; if the pressure of the pressure calibrator can reach the set value during the pressure test but the data acquisition system still does not display, it is confirmed that there is a pipeline blockage or scanning valve communication failure.

[0015] During the static commissioning phase, when the pressure of the pressure calibrator reaches the set value and remains stable during the pressurization process, but the data acquisition system displays no data, the pipeline fault and the communication fault of the scanning valve can be distinguished and located by disconnecting the pipeline from the scanning valve and observing the pressure change of the pressure calibrator.

[0016] The troubleshooting method is applicable to both positive and negative pressure measurement systems, and all data processed are gauge pressure data.

[0017] The troubleshooting method is applicable to troubleshooting abnormal pressure measurements in gas turbine compressors, combustion chambers, and turbine components.

[0018] The beneficial effects of this invention are as follows: Based on the measurement principle, this invention is divided into a static debugging measurement anomaly troubleshooting method and a dynamic test measurement anomaly troubleshooting method. Through fault phenomenon analysis, it classifies and troubleshoots the faults. This method is comprehensive and logically clear, and can accurately locate the cause of probe pressure measurement anomalies, which is of great significance to probe pressure measurement.

[0019] In addition, the present invention also has the following advantages: (1) The present invention constructs a complete pressure measurement anomaly investigation process. By dividing the investigation into two stages, static debugging and dynamic testing, which correspond to hardware fault diagnosis and data validity judgment respectively, it covers the entire link from pipeline to data acquisition system.

[0020] (2) The present invention classifies and troubleshoots based on fault phenomena. During the static debugging stage, a single pressure test can be performed to classify faults into various types such as pipeline leakage, pipeline blockage / bending, scanning valve communication failure, and data acquisition software failure, based on different pressure changes and data response characteristics, thus avoiding the inefficient operation of eliminating them one by one.

[0021] (3) In the dynamic testing phase, the present invention combines stability judgment with Q test to achieve systematic and objective elimination of abnormal data, thereby improving the scientificity and repeatability of data processing.

[0022] (4) This invention establishes a closed loop between dynamic test anomalies and static debugging and re-inspection, ensuring that anomalies found in dynamic testing can be confirmed at the hardware level under static conditions, thus avoiding misjudgment of the cause of the fault. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pressure measurement system involved in the present invention.

[0024] The components include: 1. Pressure calibrator; 2. Pressure calibrator output terminal; 3. Pressure tapping connector; 4. Pressure tapping rigid tube; 5. Pressure tapping flexible tube; 6. Pressure scanning valve connector; 7. Pressure scanning valve; 8. Communication line; 9. Data acquisition system. Detailed Implementation

[0025] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] like Figure 1 As shown in this embodiment, a method for troubleshooting abnormal pressure measurement in a gas turbine is described. The pressure measurement system targeted by the troubleshooting method includes a pressure tapping connector 3, a pressure tapping rigid pipe 4, a pressure tapping flexible pipe 5, a pressure scanning valve connector 6, and a pressure scanning valve 7 connected in sequence through pipelines, as well as a data acquisition system 9 connected to the pressure scanning valve 7 through a communication line 8. The troubleshooting methods include troubleshooting steps during the static debugging phase, troubleshooting steps during the dynamic testing phase, and verification and confirmation steps. Static commissioning phase troubleshooting steps: With the gas turbine shut down, apply standard gas pressure to the pressure measurement system for a pressure test. Based on the pressure change characteristics and data acquisition status during the pressure test, classify the faults into pipeline leakage faults, pipeline blockage or bending faults, scanning valve communication faults, and data acquisition software faults. Dynamic testing phase troubleshooting steps: Under the operating conditions of the gas turbine, the validity of the measurement data is judged, unstable data is eliminated through stability judgment, and outliers are statistically judged and eliminated through Q test; Verification and confirmation steps: For the test points corresponding to the abnormal data found in the dynamic testing phase, after shutdown, the verification is carried out through the troubleshooting steps in the static debugging phase to determine the root cause of the abnormality.

[0027] The specific troubleshooting steps during the static debugging phase include: Connect the pressure calibrator to the pipeline input of the pressure measurement system, apply standard air pressure to perform a pressure test, and observe whether the value displayed by the data acquisition system is consistent with the standard air pressure. If the pressure calibrator fails to reach the set value during the pressure test, it is determined to be a pipeline leak fault, and the sealing and integrity of the pipeline are checked. When the pressure calibrator reaches the set value and remains stable during the pressurization process, but the data acquisition system displays an abnormality, the following situations should be distinguished for fault location: Scenario 1: If the data acquisition system displays no data, disconnect the pipeline from the scanning valve. If the pressure of the pressure calibrator remains unchanged, the problem is determined to be a pipeline blockage or bend. If the pressure of the pressure calibrator drops rapidly, the pipeline problem is ruled out, and the problem is determined to be a scanning valve communication failure. Scenario 2: If the data acquisition system displays unstable or fluctuating data, it is determined to be a fault in the scanning valve or the data acquisition software.

[0028] The specific troubleshooting steps during the dynamic testing phase include: After the operating conditions stabilize, a set of measurement data is collected, the data at each measuring point are compared, and unstable data that fluctuates back and forth is eliminated. Outlier detection is performed on the remaining data. The data are arranged from smallest to largest as X1≤X2≤X3≤X4≤X5. The statistic Q=(X2-X1) / (X5-X1) is calculated, and a critical value Q0 with a confidence level of 95% is set. 95 =0.710. When Q>0.710, X1 is determined to be an outlier and is removed. The average of the remaining data is used for subsequent performance calculations. Record the measurement points that exhibit unstable data or outliers as abnormal measurement points in dynamic testing.

[0029] The pressure test adopts a step-by-step pressure increase method, applying standard air pressures corresponding to 20%, 40%, 60%, 80%, and 100% of the range in sequence. The displayed values ​​of the data acquisition system are recorded at each pressure point and compared with the corresponding standard air pressures.

[0030] During the static commissioning phase troubleshooting steps, the following fault types are distinguished through a single pressure test operation: Leakage caused by poor sealing at pipe connections or pipe damage corresponds to the phenomenon that the pressure calibrator cannot reach the set value during the pressure test. A flow failure caused by pipe bends or blockage by foreign objects corresponds to the phenomenon that the pressure of the pressure calibrator remains unchanged after disconnecting the pipe from the scanning valve; The no-data fault caused by abnormal communication between the scanning valve and the data acquisition system corresponds to the phenomenon that the pressure of the pressure calibrator drops rapidly after disconnecting the pipeline from the scanning valve. Data fluctuation faults caused by abnormal operation of the data acquisition system software correspond to the phenomenon that the pressure of the pressure calibrator is stable, but the data acquisition system displays fluctuations.

[0031] In the dynamic testing phase, different criteria are used to distinguish between unstable data and outliers: the criterion for unstable data is that the data fluctuation at the same measuring point exceeds the stable range within a predetermined time after the operating conditions stabilize; the criterion for outliers is that the Q test statistic exceeds the critical value Q0 corresponding to a 95% confidence level. 95 =0.710.

[0032] The verification and confirmation steps include: for abnormal test points recorded during the dynamic testing phase, after shutdown, perform static pressure testing on the pipeline and scanning valve channel corresponding to the test point. If the pressure of the pressure calibrator cannot reach the set value during the pressure test, it is confirmed that there is a pipeline leak or damage; if the pressure of the pressure calibrator can reach the set value during the pressure test but the data acquisition system still does not display, it is confirmed that there is a pipeline blockage or scanning valve communication failure.

[0033] During the static commissioning phase, when the pressure of the pressure calibrator reaches the set value and remains stable during the pressurization process, but the data acquisition system displays no data, the pipeline fault and the communication fault of the scanning valve can be distinguished and located by disconnecting the pipeline from the scanning valve and observing the pressure change of the pressure calibrator.

[0034] The troubleshooting method is applicable to both positive and negative pressure measurement systems, and all data processed are gauge pressure data.

[0035] The troubleshooting method is applicable to troubleshooting abnormal pressure measurements in gas turbine compressors, combustion chambers, and turbine components.

[0036] like Figure 1 As shown, the method for troubleshooting abnormal pressure measurements in a gas turbine according to the present invention is described in detail below: (a) Structure of the pressure measurement system: The system includes a pressure tapping connector 3, a pressure tapping rigid tube 4, a pressure tapping flexible tube 5, a pressure scanning valve connector 6, a pressure scanning valve 7, a communication line 8, and a data acquisition system 9. One end of the pressure tapping connector 3 connects to the output terminal 2 of the pressure calibrator of the pressure probe or pressure calibrator 1, while the other end connects sequentially to the pressure tapping rigid tube 4, the pressure tapping flexible tube 5, and the pressure scanning valve connector 6, ultimately connecting to the input ports of each channel of the pressure scanning valve 7. The pressure scanning valve 7 is connected to the data acquisition system 9 via the communication line 8. Pressure signals from each measuring point are transmitted to the pressure scanning valve 7 via the pressure tapping rigid tube 4 and the pressure tapping flexible tube 5. After being collected by the pressure scanning valve 7, the signals are transmitted to the data acquisition system 9 for recording via the communication line 8. The pressure tapping rigid tube 4 is made of stainless steel for traversing high-temperature areas; the pressure tapping flexible tube 5 is a flexible connecting tube for absorbing vibration and facilitating connection operations. The pressure measurement system includes multiple measuring points, each connected to the pressure scanning valve 7 via an independent pipeline.

[0037] (II) Troubleshooting steps during the static debugging phase: The static commissioning phase is used to troubleshoot the hardware components of the pressure measurement system step by step while the gas turbine is shut down.

[0038] First, connect the pressure calibrator output terminal 2 of the pressure calibrator 1 to the pressure tapping connector 3. Using a step-up pressure method, apply standard air pressures corresponding to 20%, 40%, 60%, 80%, and 100% of the range to the pressure scanning valve 7 through the pressure tapping hard tube 4, pressure tapping soft tube 5, and pressure scanning valve connector 6. Observe whether the value displayed by the data acquisition system 9 is consistent with the standard air pressure at each pressure point.

[0039] Based on the pressure change characteristics and data acquisition status during the pressure test, fault location is classified as follows: Category 1: Pressure cannot reach the set value - pipeline leakage failure.

[0040] During the pressurization process, if the pressure of the pressure calibrator 1 fails to reach the set value, it is determined that there is an air leak in the pressure tapping tube 4, the pressure tapping hose 5, or any of the connecting joints. In this case, the sealing and integrity of the pressure tapping tube 4, the pressure tapping hose 5, and any of the connecting joints should be checked.

[0041] Category 2: Pressure can be reached and stabilized, but no data is displayed – pipeline blockage / bend fault or scanning valve communication fault.

[0042] During the pressurization process, if the pressure of the pressure calibrator 1 can reach the set value and remain stable, but the data acquisition system 9 displays no data, then disconnect the pressure tapping hose 5 from the pressure scanning valve connector 6.

[0043] If the pressure of the pressure calibrator 1 remains unchanged after disconnection, it indicates that the pressure is trapped in the pipeline and cannot be released. This indicates that the pressure tapping rigid pipe 4 or pressure tapping flexible pipe 5 is bent or blocked, and the pipeline should be replaced.

[0044] If the pressure of the pressure calibrator 1 drops rapidly after disconnection, it indicates that the pipeline is unobstructed and the pressure can be released through the disconnection point, thus eliminating pipeline faults. It is determined that there is a communication fault in the communication line 8 between the pressure scanning valve 7 and the data acquisition system 9, and the communication line 8 should be checked.

[0045] Category 3: Pressure can be reached and stabilized, but the data fluctuates – data acquisition software malfunction or scanning valve malfunction.

[0046] During the pressurization process, if the pressure of the pressure calibrator 1 can reach the set value and remain stable, but the data displayed by the data acquisition system 9 is unstable and fluctuates, it is determined that there is a software malfunction in the pressure scanning valve 7 or the data acquisition system 9, and both should be investigated.

[0047] The fault classification logic in the static debugging phase described above can be summarized in the following table:

[0048] Case 1: Leakage in the air line after the low-pressure compressor: The air pressure after the low-pressure compressor was tested using the above static debugging method, with a range of 0.5 MPa. Standard air pressures of 0.1, 0.2, 0.3, 0.4, and 0.5 MPa were applied sequentially. During the pressurization process, the pressure calibrator 1 could not reach the set pressure of 0.5 MPa. Based on the above classification, the problem was determined to be a pipeline leak. An inspection of the pressure tapping hose 4, the pressure tapping flexible hose 5, and all connecting joints revealed a poor seal between the pressure tapping flexible hose 5 and the pressure scanning valve connector 6. After tightening, the fault was resolved.

[0049] (III) Troubleshooting steps during the dynamic testing phase: The dynamic testing phase is used to determine the validity of measurement data and remove abnormal data while the gas turbine is in operation.

[0050] First, after the operating conditions stabilize for 5 minutes, a set of measurement data is collected, and the data from each measuring point is compared. If the measurement data of a certain measuring point continues to fluctuate after stabilization (i.e., the data fluctuation exceeds the stable range), the data of that measuring point is considered unstable and is removed, and the abnormal measuring point is recorded.

[0051] Secondly, after removing unstable data, outlier detection is performed on the remaining data. If one data point is significantly lower than the others, the Q test is used for statistical analysis. The specific method is as follows: arrange the data in ascending order, recording them as X1≤X2≤X3≤X4≤X5; calculate the statistic Q=(X2-X1) / (X5-X1); and set a 95% confidence threshold Q0. 95 =0.710. If Q>0.710, then X1 is determined to be an outlier and is removed. The average value of the remaining data is used for subsequent performance calculations (such as compressor pressure ratio and surge margin). At the same time, the abnormal measurement point is recorded.

[0052] During the dynamic testing phase, different criteria are used to distinguish unstable data from outliers: the criterion for unstable data is whether the data continues to fluctuate after stabilization; the criterion for outliers is whether the Q-test statistic exceeds the critical value Q0 corresponding to a 95% confidence level. 95 =0.710.

[0053] Case 2: Dynamic testing reveals air pipeline damage after low-pressure compressor: Five minutes after the dynamic test stabilized at the 0.2 operating condition, five data points were measured by the probe after the low-pressure compressor: 0.150, 0.252, 0.251, 0.253, and 0.252 MPa. All data points were stable without any unstable fluctuations, but the 0.150 MPa value was significantly lower than the other data points.

[0054] The Q-test was used for discrimination: X1=0.150, X2=0.251, X5=0.253, and Q was calculated as (0.251-0.150) / (0.253-0.150)=0.981. The critical value Q0 is the 95% confidence level. 95 =0.710, Q=0.981>0.710, therefore 0.150MPa was determined to be an outlier and removed. The average of the remaining data (0.252, 0.251, 0.253, 0.252MPa) was used for calculations of compressor pressure ratio and surge margin. This outlier measurement point was also recorded.

[0055] (iv) Verification and confirmation steps: For abnormal measurement points recorded during the dynamic testing phase (including measurement points corresponding to unstable data and outliers), verification and confirmation are carried out through the troubleshooting steps during the static debugging phase after shutdown.

[0056] Specifically, for the pipelines and pressure scanning valve channel 7 corresponding to the abnormal measurement points recorded during the dynamic testing phase, a static pressure test was performed after shutdown: If the pressure of pressure calibrator 1 fails to reach the set value during the pressure test, it is confirmed that there is a pipeline leak or damage. If the pressure calibrator 1 can reach the set value during the pressure test but the data acquisition system 9 still does not display anything, it is confirmed that there is a pipeline blockage or a communication failure of the pressure scanning valve 7.

[0057] The above verification ensures that anomalies discovered during dynamic testing can ultimately be confirmed at the hardware level under static conditions, thus avoiding misjudgment of the cause of the fault.

[0058] Case 2 (continued): Dynamic Test Anomaly Review For the abnormal measuring point (pipeline corresponding to 0.150MPa) discovered during dynamic testing in Case 2, a re-inspection was conducted using static debugging methods after shutdown. The pressure calibrator output terminal 2 of pressure calibrator 1 was connected to the pressure tapping connector 3 corresponding to the measuring point for pressure testing. During the pressure test, the pressure of pressure calibrator 1 could not reach the set pressure of 0.2MPa, indicating a pipeline leak. Inspection of the pressure tapping rigid pipe 4 and pressure tapping flexible pipe 5 revealed damage to the pressure tapping flexible pipe 5 near the high-temperature zone. Replacing the pipe resolved the problem. Thus, the root cause of the abnormal dynamic testing was confirmed.

[0059] The troubleshooting method of this invention is applicable to both positive and negative pressure measurement methods, and the data processed are all gauge pressure data. It can be widely used to troubleshoot pressure measurement anomalies in gas turbine compressors, combustion chambers, and turbine components.

[0060] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A method for troubleshooting abnormal pressure measurements in a gas turbine, characterized in that: The pressure measurement system targeted by the investigation method includes a pressure tapping connector (3), a pressure tapping rigid pipe (4), a pressure tapping flexible pipe (5), a pressure scanning valve connector (6), a pressure scanning valve (7) connected in sequence through pipelines, and a data acquisition system (9) connected to the pressure scanning valve (7) through a communication line (8). The troubleshooting methods include troubleshooting steps during the static debugging phase, troubleshooting steps during the dynamic testing phase, and verification and confirmation steps. Static commissioning phase troubleshooting steps: With the gas turbine shut down, apply standard gas pressure to the pressure measurement system for a pressure test. Based on the pressure change characteristics and data acquisition status during the pressure test, classify the faults into pipeline leakage faults, pipeline blockage or bending faults, scanning valve communication faults, and data acquisition software faults. Dynamic testing phase troubleshooting steps: Under the operating conditions of the gas turbine, the validity of the measurement data is judged, unstable data is eliminated through stability judgment, and outliers are statistically judged and eliminated through Q test; Verification and confirmation steps: For the test points corresponding to the abnormal data found in the dynamic testing phase, after shutdown, the verification is carried out through the troubleshooting steps in the static debugging phase to determine the root cause of the abnormality.

2. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 1, characterized in that: The specific troubleshooting steps during the static debugging phase include: Connect the pressure calibrator to the pipeline input of the pressure measurement system, apply standard air pressure to perform a pressure test, and observe whether the value displayed by the data acquisition system is consistent with the standard air pressure. If the pressure calibrator fails to reach the set value during the pressure test, it is determined to be a pipeline leak fault, and the sealing and integrity of the pipeline are checked. When the pressure calibrator reaches the set value and remains stable during the pressurization process, but the data acquisition system displays an abnormality, the following situations should be distinguished for fault location: Scenario 1: If the data acquisition system displays no data, disconnect the pipeline from the scanning valve. If the pressure of the pressure calibrator remains unchanged, the problem is determined to be a pipeline blockage or bend. If the pressure of the pressure calibrator drops rapidly, the pipeline problem is ruled out, and the problem is determined to be a scanning valve communication failure. Scenario 2: If the data acquisition system displays unstable or fluctuating data, it is determined to be a fault in the scanning valve or the data acquisition software.

3. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 1, characterized in that: The specific troubleshooting steps during the dynamic testing phase include: After the operating conditions stabilize, a set of measurement data is collected, the data at each measuring point are compared, and unstable data that fluctuates back and forth is eliminated. Outlier detection is performed on the remaining data. The data are arranged from smallest to largest as X1≤X2≤X3≤X4≤X5. The statistic Q=(X2-X1) / (X5-X1) is calculated, and a critical value Q0 with a confidence level of 95% is set. 95 =0.

710. When Q>0.710, X1 is determined to be an outlier and is removed. The average of the remaining data is used for subsequent performance calculations. Record the measurement points that exhibit unstable data or outliers as abnormal measurement points in dynamic testing.

4. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 2, characterized in that: The pressure test adopts a step-by-step pressure increase method, applying standard air pressures corresponding to 20%, 40%, 60%, 80%, and 100% of the range in sequence. The displayed values ​​of the data acquisition system are recorded at each pressure point and compared with the corresponding standard air pressures.

5. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 2, characterized in that: During the static commissioning phase troubleshooting steps, the following fault types are distinguished through a single pressure test operation: Leakage caused by poor sealing at pipe connections or pipe damage corresponds to the phenomenon that the pressure calibrator cannot reach the set value during the pressure test. A flow failure caused by pipe bends or blockage by foreign objects corresponds to the phenomenon that the pressure of the pressure calibrator remains unchanged after disconnecting the pipe from the scanning valve; The no-data fault caused by abnormal communication between the scanning valve and the data acquisition system corresponds to the phenomenon that the pressure of the pressure calibrator drops rapidly after disconnecting the pipeline from the scanning valve. Data fluctuation faults caused by abnormal operation of the data acquisition system software correspond to the phenomenon that the pressure of the pressure calibrator is stable, but the data acquisition system displays fluctuations.

6. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 3, characterized in that: In the dynamic testing phase, different criteria are used to distinguish between unstable data and outliers: the criterion for unstable data is that the data fluctuation at the same measuring point exceeds the stable range within a predetermined time after the operating conditions stabilize; the criterion for outliers is that the Q test statistic exceeds the critical value Q0 corresponding to a 95% confidence level. 95 =0.

710.

7. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 1, characterized in that: The verification and confirmation steps include: for abnormal test points recorded during the dynamic testing phase, after shutdown, perform static pressure testing on the pipeline and scanning valve channel corresponding to the test point. If the pressure of the pressure calibrator cannot reach the set value during the pressure test, it is confirmed that there is a pipeline leak or damage; if the pressure of the pressure calibrator can reach the set value during the pressure test but the data acquisition system still does not display, it is confirmed that there is a pipeline blockage or scanning valve communication failure.

8. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 1, characterized in that: During the static commissioning phase, when the pressure of the pressure calibrator reaches the set value and remains stable during the pressurization process, but the data acquisition system displays no data, the pipeline fault and the communication fault of the scanning valve can be distinguished and located by disconnecting the pipeline from the scanning valve and observing the pressure change of the pressure calibrator.

9. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 1, characterized in that: The troubleshooting method is applicable to both positive and negative pressure measurement systems, and all data processed are gauge pressure data.

10. The method for troubleshooting abnormal pressure measurements in a gas turbine as described in claim 1, characterized in that: The troubleshooting method is applicable to troubleshooting abnormal pressure measurements in gas turbine compressors, combustion chambers, and turbine components.

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