A method for troubleshooting a marine gas turbine vibration monitoring system

Abstract

The application discloses a marine gas turbine vibration monitoring system troubleshooting method, and relates to the technical field of gas turbines. When the gas turbine is in operation, the method is used for judging the fault causes of the peripheral vibration measurement system and finally positioning the fault point by segmentally checking the vibration monitoring components and related peripheral equipment for measuring high-pressure vibration. The method can realize comprehensive investigation of the equipment, circuit, installation process and the like of the vibration measurement system without stopping the operation, can quickly and accurately position the causes of the excessively large high-pressure vibration value of the gas turbine vibration monitoring system, and has important significance for accurately monitoring the vibration condition of the marine gas turbine and safe operation of the gas turbine.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbine technology, in particular to a method for troubleshooting of a vibration monitoring system of a marine gas turbine. BACKGROUND

[0002] With the development of information technology, marine gas turbines gradually go on the road of high-end, complex, and automation. Severe vibration can cause friction and wear of bearings and mechanism transmission failure, and also cause crack initiation and fatigue damage of important devices. Due to the characteristics that vibration signals are easy to be monitored and directly related to mechanical equipment, the vibration signal monitoring is performed at the signal feature points of the marine power equipment, and the fault information contained in the vibration signal is extracted, which has important significance for the later signal analysis and is an effective means in mechanical fault diagnosis technology. Abnormal vibration signal measurement can directly cause the marine gas turbine monitoring system to make wrong judgment on the state of the marine gas turbine, thereby causing the marine gas turbine to reduce the working condition or even to be shut down, which seriously affects the safe operation of the marine gas turbine. SUMMARY

[0003] The present application relates to the field of gas turbine technology, in particular to a method for troubleshooting of a vibration monitoring system of a marine gas turbine.

[0004] A method for troubleshooting of a vibration monitoring system of a marine gas turbine, comprising the following steps:

[0005] During the working condition operation, if the high-pressure vibration value displayed by the gas turbine digital monitoring system is abnormal, the signal input plug of the external high-pressure and low-pressure channel of the vibration monitoring component in the gas turbine vibration monitoring system is exchanged, and whether the vibration signal will follow the input channel is observed;

[0006] If the high-pressure vibration value is higher than the preset value, the fault condition of the internal high-pressure channel of the vibration monitoring component for gas turbine vibration measurement is checked;

[0007] If the low-pressure vibration value is higher than the preset value, the fault condition of the external high-pressure channel of the vibration monitoring component, the peripheral circuit, the installation process, and the vibration sensor accessory is checked;

[0008] If the low-pressure vibration value is still abnormal, a spectrum analyzer is externally connected to the diagnostic interface of the vibration monitoring component, and the fault condition of the external high-pressure channel of the vibration monitoring component and the vibration sensor is further checked according to the waveform of the frequency spectrum analysis atlas of the low-pressure channel.

[0009] Further technical solutions are provided for checking the fault condition of the internal high-pressure channel of the vibration monitoring component for gas turbine vibration measurement, comprising:

[0010] The signal input plug of the external high-pressure and low-pressure channel is reduced, whether the connection line of the internal high-pressure channel of the vibration monitoring assembly is broken, and whether the welding point of the connection line and the corresponding electrical connector is firm is checked, if abnormal, the corresponding fault position is determined and processed; wherein the connection line includes a power line, a signal input line and a signal output line;

[0011] If normal, the amplifier output plug of the internal high-pressure and low-pressure channel of the vibration monitoring assembly is exchanged, each amplifier output end is connected to the conditioning board of the corresponding channel, and the vibration display of the gas turbine digital monitoring system is observed;

[0012] If the high-pressure vibration value displayed is higher than the preset value, it is determined that the high-pressure channel conditioning board is faulty;

[0013] If the low-pressure vibration value displayed is higher than the preset value, it is determined that the high-pressure channel amplifier is faulty.

[0014] Further technical solutions thereof are to troubleshoot the fault conditions of the peripheral lines of the external high-pressure channel of the vibration monitoring assembly, including:

[0015] Whether the on-machine sensor output line is loose and whether the line is bundled and fastened is checked;

[0016] Whether the thermal insulation layer and the skin of each cable and the cable connection in the high-temperature area of the gas turbine are damaged is checked;

[0017] Whether the on-machine electrical connector is aged and loose, and whether the tail clamp fixing screw is loose is checked;

[0018] Whether the lower electrical connector of the box body is aged, loose and oil-injected is checked;

[0019] Whether the signal input line from the vibration sensor in the high-pressure channel to the vibration monitoring assembly is interfered by strong electric lines is checked.

[0020] Further technical solutions thereof are to troubleshoot the fault conditions of the installation process of the external high-pressure channel of the vibration monitoring assembly, including:

[0021] Whether the on-machine sensor output line is bundled together with the coarse gas pipe is checked, and the correct installation process is that the low-pressure output line is fixed by a plastic cable tie, and the high-pressure output line is fixed by a copper cable tie, and is bundled on the fine pipe.

[0022] Further technical solutions thereof are to troubleshoot the fault conditions of the vibration sensor accessories of the external high-pressure channel of the vibration monitoring assembly, including:

[0023] Whether the vibration sensor triangular seat and the base fixing screw are loose is checked;

[0024] Whether the vibration sensor root metal rod is damaged is checked;

[0025] Check whether the vibration sensor root metal hose is forced, and require smooth transition.

[0026] Further technical solutions are to further investigate the fault conditions of the peripheral lines of the external high-pressure channel and the vibration sensor of the vibration monitoring assembly according to the waveform of the spectrum analysis graph of the low-pressure channel, including:

[0027] If there is a sustained vibration value in the spectrum analysis graph, and the rotational frequency corresponding to the rotational speed in the spectrum graph meets the requirements, and the spectrum is clean and free of interference waves, it is determined that the vibration value is a real vibration signal, and the external high-pressure channel does not have a fault.

[0028] Further technical solutions are to further investigate the fault conditions of the peripheral lines of the external high-pressure channel and the vibration sensor of the vibration monitoring assembly according to the waveform of the spectrum analysis graph of the low-pressure channel, including:

[0029] If there is a fluctuation of the spectrum analysis graph, a temporary line is directly connected between the vibration sensor of the high-pressure channel and the signal input connector of the vibration monitoring assembly, if the vibration signal returns to normal, the fault conditions of the peripheral lines, installation process and vibration sensor accessories of the external high-pressure channel of the vibration monitoring assembly are investigated again, if there is still noise, it is determined that the vibration sensor of the high-pressure channel has a fault.

[0030] Further technical solutions are to further investigate the fault conditions of the peripheral lines of the external high-pressure channel and the vibration sensor of the vibration monitoring assembly according to the waveform of the spectrum analysis graph of the low-pressure channel, including:

[0031] If there is a vibration jump in the spectrum analysis graph, it is determined that the line has interference, the aging, corrosion and water ingress of the line are investigated, if the fault cannot be eliminated, the vibration sensor extension line and the box body of the high-pressure channel to the vibration monitoring assembly signal input line need to be replaced.

[0032] Further technical solutions are that the temporary line uses a low-noise cable.

[0033] Further technical solutions are that the method further includes:

[0034] After determining the fault, if the vibration sensor or the internal device of the vibration monitoring assembly is replaced, the vibration sensor corresponding to the channel with the changed state needs to be recalibrated.

[0035] The beneficial technical effects of the present application are:

[0036] When the gas turbine is running, the signal input plug of the high pressure and low pressure channel outside the vibration monitoring assembly is exchanged, whether the vibration signal will follow the input channel change is observed, if the high pressure vibration value is still too large, whether the high pressure channel of the vibration monitoring assembly itself is faulty is checked, if the low pressure vibration value is too large, other faults such as peripheral circuit, installation process, sensor damage of the external high pressure channel are checked, if the fault still cannot be eliminated, the frequency spectrum analyzer is externally connected on the vibration monitoring assembly diagnostic interface, whether it is an interference and other faults is judged according to the specific waveform of the frequency spectrum analysis diagram. The method can realize comprehensive investigation of the equipment, circuit, installation process and other aspects of the vibration measurement system without shutdown, can quickly and accurately locate the reason of the high pressure vibration value of the gas turbine vibration monitoring system, and has important significance for accurately monitoring the vibration condition of the marine gas turbine and the safe operation of the gas turbine. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is the schematic diagram of the marine gas turbine vibration monitoring assembly provided by the application.

[0038] Figure 2 is the layout diagram of the marine gas turbine vibration monitoring assembly provided by the application.

[0039] Figure 3 is the flow chart of the marine gas turbine vibration monitoring system fault checking method provided by the application. DETAILED DESCRIPTION

[0040] The specific embodiments of the application will be further described in combination with the drawings.

[0041] In combination with Figure 1 , Figure 3 , the application discloses a marine gas turbine vibration monitoring system fault checking method, which comprises the following steps:

[0042] Step one, when the working condition is running, if the high pressure vibration value of the gas turbine digital monitoring system is abnormal, the signal input plug 1 of the high pressure channel and the signal input plug 2 of the low pressure channel of the vibration monitoring assembly in the gas turbine vibration monitoring system are exchanged, whether the vibration signal will follow the input channel change is observed.

[0043] Step two, if the high pressure vibration value is higher than the preset value (that is, the vibration signal does not follow the input channel change), it is determined that the high pressure channel vibration sensor and the external circuit are normal, the fault condition of the internal high pressure channel of the vibration monitoring assembly for the vibration measurement of the gas turbine needs to be checked, and the specific checking steps include:

[0044] ① Check the signal input plug 1 of the external high-pressure channel, the signal input plug 2 of the low-pressure channel, open the cover of the vibration monitoring assembly, check whether the connection line of the internal high-pressure channel of the vibration monitoring assembly is broken, and whether the welding points of the connection line and the corresponding electrical connector are firm, that is, whether there are phenomena such as breakage and loose welding. If abnormal, determine the corresponding fault position and handle it. Among them, the connection line includes the power line, the signal input line and the signal output line.

[0045] ② After completing the content of step 1, if no fault reason is found, that is, the internal line is normal, exchange the amplifier output plug of the internal high-pressure and low-pressure channel of the vibration monitoring assembly, and observe the vibration display of the gas turbine digital monitoring system. As shown in FIG. 2, each amplifier output end is connected to the conditioning board of the corresponding channel, and the conditioning board layer is finally connected to the signal output plug of the vibration monitoring assembly, and the power board layer is used to power the amplifier layer and the conditioning board layer. Figure 2

[0046] ③ After completing the content of step 2, if the high-pressure vibration value displayed by the gas turbine digital monitoring system is higher than the preset value, it is determined that the high-pressure channel conditioning board is faulty, and the replacement of the conditioning board needs to be completed.

[0047] ④ After completing the content of step 2, if the low-pressure vibration value displayed by the gas turbine digital monitoring system is higher than the preset value, it is determined that the high-pressure channel amplifier is faulty, and the high-pressure amplifier needs to be replaced.

[0048] Step three, if the high-pressure vibration value returns to normal and the low-pressure vibration value is higher than the preset value (that is, the vibration signal follows the input channel change), it is determined that the high-pressure channel vibration sensor and the external line are abnormal, and the fault conditions of the external peripheral line, installation process and vibration sensor accessories of the external high-pressure channel of the vibration monitoring assembly need to be checked. The specific troubleshooting steps include:

[0049] ① Check whether the output line (including the extension line) of the on-machine sensor (including the vibration sensor) is loose, and whether the line is bundled and fastened.

[0050] ② Check whether the heat insulation layer and the skin of each cable and cable connection in the high-temperature area (such as high-pressure and moving vortex) of the gas turbine are damaged.

[0051] ③ Check whether the on-machine 4-core electrical connector is aged and loose, and whether the tail clamp fixing screw is loose.

[0052] ④ Check whether the box body 12-core electrical connector is aged, loose, and oil-filled.

[0053] ⑤ Check whether the signal input line from the vibration sensor in the high-pressure channel to the vibration monitoring assembly is interfered by strong electrical lines.

[0054] ​(6) Check whether the sensor output line (including the extension line) is tied with the thick air pipe. The correct installation process is to fix the low-voltage output line with plastic cable ties and the high-voltage output line with copper cable ties, and tie them on the thin pipe.

[0055] (7) Check whether the vibration sensor triangular seat and base fixing screws are loose.

[0056] (8) Check whether the vibration sensor root metal rod is damaged.

[0057] (9) Check whether the vibration sensor root metal hose is stressed. It is required to transition smoothly to avoid right angles and 45° angles.

[0058] Step four, if the low-voltage vibration value is still abnormal, an external spectrum analyzer is connected to the diagnostic interface of the vibration monitoring assembly, and the fault conditions of the external high-voltage channel and the vibration sensor are further investigated according to the waveform of the low-voltage channel spectrum analysis diagram. The specific troubleshooting steps include:

[0059] (1) If there is a sustained vibration value in the spectrum analysis diagram, and the corresponding rotational frequency under the rotational speed in the spectrum diagram meets the requirements, that is, the rotational frequency is large, and the spectrum is clean and free of interference waves, it is determined that the vibration value is a true vibration signal, and there is no fault in the external high-voltage channel.

[0060] (2) If there are fluctuations and large interference signals on the spectrum analysis diagram, further investigation of the line and vibration sensor is required: a temporary line is directly connected between the vibration sensor in the high-voltage channel and the vibration monitoring assembly signal input electrical connector for verification. If the low-voltage vibration signal returns to normal, the fault conditions of the external high-voltage channel, installation process, and vibration sensor accessories of the vibration monitoring assembly are investigated again, that is, steps 1-8 in step three are investigated again. If there are still fluctuations, it is determined that the vibration sensor of the high-voltage channel is faulty and needs to be replaced. In this example, the temporary line is a low-noise cable.

[0061] (3) If there is a vibration jump in the spectrum analysis diagram, it is determined that the line is interfered, and the aging, corrosion, and water ingress of the line are investigated. If the fault cannot be eliminated, the vibration sensor extension line and the box body to the vibration monitoring assembly signal input line of the high-voltage channel need to be replaced.

[0062] Step five, after the above steps are completed, if the vibration sensor or internal components of the vibration monitoring assembly are replaced, the vibration sensor corresponding to the channel with changed state needs to be recalibrated. Optionally, if there is no change in parameters, only slight changes can be made by knocking the vibration sensor to check whether the feedback vibration signal is similar to the previous calibration signal, and whether recalibration is needed.

[0063] The above merely describes the preferred embodiments of the present application, and the present application is not limited to the above embodiments. It can be understood that other improvements and changes directly derived or thought by those skilled in the art without departing from the spirit and concept of the present application shall be considered to be within the protection scope of the present application.

Claims

1. A method of troubleshooting a marine gas turbine vibration monitoring system, the method comprising: The method comprises: During operation, if the high-pressure vibration value displayed by the gas turbine digital monitoring system is abnormal, the signal input plug of the external high-pressure and low-pressure channel of the vibration monitoring assembly of the gas turbine vibration monitoring system is exchanged, and whether the vibration signal will follow the input channel is observed; If the high-pressure vibration value is higher than the preset value, the fault condition of the internal high-pressure channel of the vibration monitoring assembly for gas turbine vibration measurement is checked; If the low-pressure vibration value is higher than the preset value, the fault condition of the peripheral circuit, installation process and vibration sensor accessory of the external high-pressure channel of the vibration monitoring assembly is checked; If the low-pressure vibration value is still abnormal, a frequency spectrum analyzer is externally connected to the diagnostic interface of the vibration monitoring assembly, and the fault condition of the peripheral circuit and vibration sensor of the external high-pressure channel of the vibration monitoring assembly is further checked according to the waveform of the frequency spectrum analysis atlas of the low-pressure channel, including: If there is a sustained vibration value in the frequency spectrum analysis atlas, and the rotational frequency corresponding to the rotational speed in the frequency spectrum diagram meets the requirements, and the frequency spectrum is clean and free of interference waves, it is determined that the vibration value is a real vibration signal, and the external high-pressure channel has no fault; If there is a fluctuation of the upper and lower waves in the frequency spectrum analysis atlas, a temporary line is directly connected between the vibration sensor in the high-pressure channel and the signal input electrical connector of the vibration monitoring assembly, if the vibration signal returns to normal, the fault condition of the peripheral circuit, installation process and vibration sensor accessory of the external high-pressure channel of the vibration monitoring assembly is checked again, if there is still a fluctuation, it is determined that the vibration sensor of the high-pressure channel has a fault; If there is a vibration jump in the frequency spectrum analysis atlas, it is determined that the circuit has interference, and the aging, corrosion and water ingress of the circuit are checked, if the fault cannot be eliminated, the extension line of the vibration sensor of the high-pressure channel and the box body to the signal input line of the vibration monitoring assembly need to be replaced.

2. The marine gas turbine vibration monitoring system troubleshooting method of claim 1, wherein, The checking of the fault condition of the internal high-pressure channel of the vibration monitoring assembly for gas turbine vibration measurement comprises: The signal input plug of the external high-pressure and low-pressure channel is restored, and whether the connection line of the internal high-pressure channel of the vibration monitoring assembly is broken and whether the welding point of the connection line and the corresponding electrical connector is firm is checked, if abnormal, the corresponding fault position is determined and processed; wherein the connection line includes a power line, a signal input line and a signal output line; If normal, the amplifier output plug of the internal high-pressure and low-pressure channel of the vibration monitoring assembly is exchanged, each amplifier output end is connected to the conditioning board of the corresponding channel, and the vibration display of the gas turbine digital monitoring system is observed; If the high-pressure vibration value is higher than the preset value, it is determined that the high-pressure channel conditioning board has a fault; If the low-pressure vibration value is higher than the preset value, it is determined that the high-pressure channel amplifier has a fault.

3. The marine gas turbine vibration monitoring system troubleshooting method of claim 1, wherein, The checking of the fault condition of the peripheral circuit of the external high-pressure channel of the vibration monitoring assembly comprises: Whether the sensor output line on the machine is loose and whether the line is bundled and fastened is checked; Whether the heat insulation layer and the skin of each cable and the cable connection in the high-temperature area of the gas turbine are damaged is checked; Whether the electrical connector on the machine is aged, virtual welded and the tail clamp fixing screw is loose is checked; Whether the electrical connector of the box body is aged, virtual welded and oil-filled is checked; Check whether the signal input line of the vibration sensor located in the high-pressure channel to the signal input line of the vibration monitoring assembly is interfered by strong electric lines.

4. The marine gas turbine vibration monitoring system troubleshooting method of claim 1, wherein, Troubleshoot the failure of the installation process of the high-pressure channel outside the vibration monitoring assembly, including: Check whether the on-machine sensor output line is bundled with the coarse air pipe. The correct installation process is to fix the low-pressure output line with plastic cable ties and the high-pressure output line with copper cable ties, and bundle them on the fine pipe.

5. The marine gas turbine vibration monitoring system troubleshooting method of claim 1, wherein, Troubleshoot the failure of the vibration sensor accessories of the high-pressure channel outside the vibration monitoring assembly, including: Check whether the vibration sensor triangular seat and base fixing screws are loose; Check whether the vibration sensor root metal rod is damaged; Check whether the vibration sensor root metal hose is under stress, and require smooth transition.

6. The marine gas turbine vibration monitoring system troubleshooting method of claim 1, wherein, The temporary line uses a low-noise cable.

7. The method of claim 1-6, wherein, The method further includes: After determining the failure, if the vibration sensor or internal device of the vibration monitoring assembly is replaced, the vibration sensor corresponding to the channel with changed state needs to be recalibrated.

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