A method for troubleshooting power turbine speed control of a marine gas turbine

Abstract

The present application discloses a method for troubleshooting a power turbine speed control fault of a marine gas turbine, and relates to the field of marine gas turbines. The method determines that a fault occurs in a measurement channel of a power turbine speed control unit as long as a brake fault is detected in an output shaft of the power turbine; and when it is determined that the power turbine shuts down due to an overspeed fault, a targeted troubleshooting method is indicated based on the speed of the power turbine of the control unit and the speed of the power turbine of the monitoring unit, and according to the specific phenomenon of the power turbine speed control fault. The method is practical, can efficiently troubleshoot a power turbine speed control fault of a gas turbine, and is of great significance for restoring the stable operation of the gas turbine.

Description

Technical Field

[0001] The present application relates to the field of marine gas turbines, and in particular to a method for troubleshooting a power turbine speed control fault of a marine gas turbine. Background Art

[0002] A gas turbine is a power output device. A marine gas turbine uses a power turbine to output kinetic energy. The free end of the power turbine is connected to the gearbox. During the operation of a gas turbine, power turbine speed control failures often occur. There are many possible causes of power turbine speed control failures. Currently, it is often difficult to effectively and quickly troubleshoot and repair them. On the one hand, it poses a major hidden danger to the stable operation of the gas turbine. On the other hand, the gas turbine cannot be restored to operation as soon as possible, thus affecting its working efficiency. Summary of the invention

[0003] In view of the above problems and technical requirements, the applicant has proposed a method for troubleshooting the power turbine speed control of a marine gas turbine. The technical solution of the application is as follows:

[0004] A method for troubleshooting a power turbine speed control fault of a marine gas turbine, the method comprising:

[0005] During the operation of a marine gas turbine, when a brake failure occurs on the output shaft of the power turbine, the speed of the power turbine N 3c The measurement channel fails;

[0006] When the power turbine shuts down due to overspeed fault, if the power turbine speed N3 <N 3_check , then according to the control engine power turbine speed N 3c , monitor the engine power turbine speed N 3m And the stop speed N 3_stop The speed relationship determines the corresponding fault troubleshooting result; if the power turbine speed N3≥N 3_check , first check the power turbine overspeed limiter check signal, and according to the check result of the power turbine overspeed limiter check signal, according to the control engine power turbine speed N 3c , monitor the engine power turbine speed N 3m And the stop speed N 3_stop The speed relationship determines the corresponding troubleshooting result; where N 3_check It is the speed check value.

[0007] Its further technical solution is that when N3 <N 3_check When the corresponding troubleshooting result is determined, the method includes:

[0008] When monitoring the engine power turbine speed N 3m and control the engine power turbine speed N3c If inconsistent, according to the shutdown speed N 3_stop Determine the acquisition channel of the power turbine speed with fault;

[0009] When monitoring the engine power turbine speed N 3m and control the engine power turbine speed N 3c When the same, according to the stop speed N 3_stop Determine that the power turbine overspeed limiter is faulty or that the power turbine speed N3 has an overspeed fault.

[0010] Its further technical solution is to use the shutdown speed N 3_stop The acquisition channel for determining the power turbine speed with a fault includes:

[0011] When N 3c ≥N 3_stop And N 3m When within the corresponding working range, determine the control engine power turbine speed N 3c There is a fault in the acquisition channel;

[0012] When N 3m ≥N 3_stop And N 3c When within the corresponding working range, determine the monitoring machine power turbine speed N 3m The acquisition channel fails.

[0013] A further technical solution is that when the motor power turbine speed N is monitored 3m and control the engine power turbine speed N 3c When consistent:

[0014] If N 3c <N 3_stop 、N 3m <N 3_stop , it was determined that the power turbine overspeed limiter had failed;

[0015] If N 3c ≥N 3_stop 、N 3m ≥N 3_stop , it is determined that the power turbine speed N3 has an overspeed fault.

[0016] Its further technical solution is that when N3≥N 3_check When the corresponding troubleshooting result is determined, the method includes:

[0017] If the power turbine overspeed limiter check signal troubleshooting results indicate that the power turbine overspeed limiter check signal is in a normal state, then according to the monitoring engine power turbine speed N 3m , control engine power turbine speed N 3c and stop speed N3_stop Determine the acquisition channel of the power turbine speed that has a fault or determine that the power turbine speed N3 has an overspeed fault;

[0018] If the power turbine overspeed limiter check signal troubleshooting result indicates that the power turbine overspeed limiter check signal is in an abnormal state, then according to the monitoring engine power turbine speed N 3m , control engine power turbine speed N 3c and stop speed N 3_stop It was determined that the power turbine overspeed limiter was malfunctioning.

[0019] A further technical solution is that when the power turbine overspeed limiter check signal is in a normal state:

[0020] If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c If they are inconsistent, then according to the shutdown speed N 3_stop Determine the acquisition channel of the power turbine speed with fault;

[0021] If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c Consistent, and N 3c ≥N 3_stop 、N 3m ≥N 3_stop , it is determined that the power turbine speed N3 has an overspeed fault.

[0022] Its further technical solution is to use the shutdown speed N 3_stop The acquisition channel for determining the power turbine speed with a fault includes:

[0023] If N 3c ≥N 3_stop And N 3m In the corresponding speed range, the control engine power turbine speed N is determined 3c The measurement channel fails;

[0024] If N 3m ≥N 3_stop And N 3c Within the corresponding speed range, the monitoring engine power turbine speed N is determined 3m A measurement channel has failed.

[0025] A further technical solution is that when the power turbine overspeed limiter check signal is in an abnormal state:

[0026] If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c Consistent, and N 3c <N3_stop 、N 3m <N 3_stop , it is determined that the power turbine overspeed limiter is faulty.

[0027] The beneficial technical effects of this application are:

[0028] The present application discloses a method for troubleshooting power turbine speed control faults of a marine gas turbine. The method is based on the speed of the power turbine of the control engine and the speed of the power turbine of the monitoring engine, and indicates a targeted troubleshooting method according to the specific phenomenon of the power turbine speed control fault. The method is practical and can efficiently troubleshoot the power turbine speed control fault of the gas turbine, which is of great significance to restoring the stable operation of the gas turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 In one embodiment of the present application, when a power turbine speed control failure occurs in a marine gas turbine, the troubleshooting results under various different parameter conditions are presented. DETAILED DESCRIPTION

[0030] The specific implementation of the present application is further described below in conjunction with the accompanying drawings.

[0031] This application discloses a method for troubleshooting a power turbine speed control fault of a marine gas turbine. Please refer to Figure 1 The flowchart shown

[0032] During the operation of a marine gas turbine, when a brake failure occurs on the output shaft of the power turbine, the speed of the power turbine N 3c The measurement channel of the control engine power turbine speed N should be checked. 3c The measurement channel includes the corresponding speed sensor.

[0033] During the operation of a marine gas turbine, when the power turbine shuts down due to an overspeed fault, it is divided into the following two categories according to the size of the power turbine speed N3 when the fault occurs:

[0034] 1. If the power turbine speed N3 when the fault occurs <N 3_check , then according to the control engine power turbine speed N 3c , monitor the engine power turbine speed N 3m And the stop speed N 3_stop The speed relationship determines the corresponding troubleshooting results. 3_check is the speed check value. The method to determine the corresponding troubleshooting result is:

[0035] When monitoring the engine power turbine speed N 3m and control the engine power turbine speed N 3c If inconsistent, according to the shutdown speed N3_stop Determine the acquisition channel of the power turbine speed with fault. Specifically:

[0036] (1.1) When N 3c ≥N 3_stop And N 3m When within the corresponding working range, determine the control engine power turbine speed N 3c The acquisition channel of the control engine should be checked for faults. 3c The acquisition channel includes the corresponding speed sensor.

[0037] (1.2) When N 3m ≥N 3_stop And N 3c When within the corresponding working range, determine the monitoring machine power turbine speed N 3m If the acquisition channel fails, the motor turbine speed N should be monitored. 3m The acquisition channel includes the corresponding speed sensor.

[0038] When monitoring the engine power turbine speed N 3m and control the engine power turbine speed N 3c When the same, according to the stop speed N 3_stop Determine that the power turbine overspeed limiter is faulty or the power turbine speed N3 is overspeeding. Specifically:

[0039] (1.3) If N 3c <N 3_stop 、N 3m <N 3_stop , determine that the power turbine overspeed limiter is faulty, and check the power turbine overspeed limiter and its speed acquisition channel, including the corresponding speed sensor.

[0040] (1.4) If N 3c ≥N 3_stop 、N 3m ≥N 3_stop , it is determined that the power turbine speed N3 has an actual overspeed fault, and mechanical facilities such as the adjustable pitch propeller should be checked.

[0041] 2. If the power turbine speed N3≥N when the fault occurs 3_check , first check the power turbine overspeed limiter check signal, and according to the check result of the power turbine overspeed limiter check signal, according to the control engine power turbine speed N 3c , monitor the engine power turbine speed N 3m And the stop speed N 3_stop The corresponding troubleshooting results are determined by the speed relationship.

[0042] If the power turbine overspeed limiter check signal troubleshooting results indicate that the power turbine overspeed limiter check signal is in a normal state, then according to the monitoring engine power turbine speed N 3m , control engine power turbine speed N 3c and stop speed N 3_stop Determine the acquisition channel of the power turbine speed that has a fault or determine that the power turbine speed N3 has an overspeed fault. Specifically:

[0043] If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c If they are inconsistent, then according to the shutdown speed N 3_stop Determine the acquisition channel of the faulty power turbine speed:

[0044] (2.1) If N 3c ≥N 3_stop And N 3m In the corresponding speed range, the control engine power turbine speed N is determined 3c A measurement channel has failed.

[0045] (2.2) If N 3m ≥N 3_stop And N 3c Within the corresponding speed range, the monitoring engine power turbine speed N is determined 3m A measurement channel has failed.

[0046] (2.3) If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c Consistent, and N 3c ≥N 3_stop 、N 3m ≥N 3_stop , it is determined that the power turbine speed N3 has an overspeed fault.

[0047] If the power turbine overspeed limiter check signal troubleshooting result indicates that the power turbine overspeed limiter check signal is in an abnormal state, then according to the monitoring engine power turbine speed N 3m , control engine power turbine speed N 3c and stop speed N 3_stop It was determined that the power turbine overspeed limiter was malfunctioning.

[0048] (2.4) If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c Consistent, and N 3c <N 3_stop 、N 3m <N 3_stop , it is determined that the power turbine overspeed limiter is faulty.

[0049] In one example, after a gas turbine is successfully started, a sudden power turbine output shaft brake failure occurs during idling. The control engine power turbine speed N 3c Through investigation, it is found that the control engine power turbine speed N 3c The corresponding speed sensor and signal line are loose, and the fault is eliminated after tightening. In this example, by observing the control monitoring section, it is determined that the speed of the power turbine of the monitoring machine at this time is N 3m The speed of the turbine is 1800r / min (revolutions / minute) and is stable, within the range of empirical operation values. 3c The speed fluctuates between 1800r / min and 200r / min, which is indeed abnormal.

[0050] In another example, after a gas turbine has been running continuously for 20 hours, it suddenly shuts down due to power turbine overspeed failure at 90% of rated operating conditions. 3_check =2000r / min, when the gas turbine is under 90% rated working condition, the power turbine speed N3>N when the fault occurs 3_check First, query the historical data when the fault occurs to check the power turbine overspeed limiter check signal and make sure that the power turbine overspeed limiter check signal is in a normal state. 3c =N 3m =3802r / min, and the shutdown speed N 3_stop =3800r / min, then because N 3c ≥N 3_stop 、N 3m ≥N 3_stop , it is determined that the power turbine speed N3 has an overspeed fault. Through investigation, it was found that due to the abnormality of the adjustable pitch propeller hydraulic oil, the propeller pitch decreased, which caused the fixed power turbine speed N3 to overspeed. After the fault was eliminated, the gas turbine resumed stable operation.

[0051] The above is only a preferred embodiment of the present application, and the present application is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the protection scope of the present application.

Claims

1. A method for troubleshooting a power turbine speed control fault of a marine gas turbine, characterized in that: The method comprises: During the operation of a marine gas turbine, when a brake failure occurs on the output shaft of the power turbine, the speed of the power turbine N 3c The measurement channel fails; When the power turbine shuts down due to overspeed fault, if the power turbine speed N3 <N 3_check , then according to the control engine power turbine speed N 3c , monitor the engine power turbine speed N 3m And the stop speed N 3_stop The speed relationship determines the corresponding fault troubleshooting result; if the power turbine speed N3≥N 3_check , first check the power turbine overspeed limiter check signal, and according to the check result of the power turbine overspeed limiter check signal, according to the control engine power turbine speed N 3c , monitor the engine power turbine speed N 3m And the stop speed N 3_stop The speed relationship determines the corresponding troubleshooting result; where N 3_check It is the speed check value.

2. The method according to claim 1, characterized in that When N3 <N 3_check When the corresponding troubleshooting result is determined, the method includes: When monitoring the engine power turbine speed N 3m and control the engine power turbine speed N 3c If inconsistent, according to the shutdown speed N 3_stop Determine the acquisition channel of the power turbine speed with fault; When monitoring the engine power turbine speed N 3m and control the engine power turbine speed N 3c When the same, according to the stop speed N 3_stop Determine that the power turbine overspeed limiter is faulty or that the power turbine speed N3 has an overspeed fault.

3. The method according to claim 2, characterized in that According to the stop speed N 3_stop The acquisition channel for determining the power turbine speed with a fault includes: When N 3c ≥N 3_stop And N 3m When within the corresponding working range, determine the control engine power turbine speed N 3c There is a fault in the acquisition channel; When N 3m ≥N 3_stop And N 3c When within the corresponding working range, determine the monitoring machine power turbine speed N 3m The acquisition channel fails.

4. The method according to claim 2, characterized in that: When monitoring the engine power turbine speed N 3m and control the engine power turbine speed N 3c When consistent: If N 3c <N 3_stop 、N 3m <N 3_stop , it was determined that the power turbine overspeed limiter had failed; If N 3c ≥N 3_stop 、N 3m ≥N 3_stop , it is determined that the power turbine speed N3 has an overspeed fault.

5. The method according to claim 1, characterized in that When N3 ≥ N 3_check When the corresponding troubleshooting result is determined, the method includes: If the power turbine overspeed limiter check signal troubleshooting results indicate that the power turbine overspeed limiter check signal is in a normal state, then according to the monitoring engine power turbine speed N 3m , control engine power turbine speed N 3c and stop speed N 3_stop Determine the acquisition channel of the power turbine speed that has a fault or determine that the power turbine speed N3 has an overspeed fault; If the power turbine overspeed limiter check signal troubleshooting result indicates that the power turbine overspeed limiter check signal is in an abnormal state, then according to the monitoring engine power turbine speed N 3m , control engine power turbine speed N 3c and stop speed N 3_stop It was determined that the power turbine overspeed limiter was malfunctioning.

6. The method according to claim 5, characterized in that When the power turbine overspeed limiter check signal is in normal state: If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c If they are inconsistent, then according to the shutdown speed N 3_stop Determine the acquisition channel of the power turbine speed with fault; If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c Consistent, and N 3c ≥N 3_stop 、N 3m ≥N 3_stop , it is determined that the power turbine speed N3 has an overspeed fault.

7. The method according to claim 6, characterized in that According to the stop speed N 3_stop The acquisition channel for determining the power turbine speed with a fault includes: If N 3c ≥N 3_stop And N 3m In the corresponding speed range, the control engine power turbine speed N is determined 3c The measurement channel fails; If N 3m ≥N 3_stop And N 3c Within the corresponding speed range, the monitoring engine power turbine speed N is determined 3m A measurement channel has failed.

8. The method according to claim 5, characterized in that When the power turbine overspeed limiter check signal is in an abnormal state: If the monitoring engine power turbine speed N 3m and control the engine power turbine speed N 3c Consistent, and N 3c <N 3_stop 、N 3m <N 3_stop , it is determined that the power turbine overspeed limiter is faulty.

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