CN115127824B

CN115127824B - A method for troubleshooting power turbine speed control of a marine gas turbine

Info

Publication number: CN115127824B
Application number: CN202210814295.0A
Authority: CN
Inventors: 魏昌淼; 曹春荣; 邹振宇; 俞健; 唐祖定
Original assignee: 703th Research Institute of CSIC Wuxi Branch
Current assignee: 703th Research Institute of CSIC Wuxi Branch
Priority date: 2022-07-11
Filing date: 2022-07-11
Publication date: 2025-02-25
Anticipated expiration: 2042-07-11
Also published as: CN115127824A

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

Power turbine rotating speed control fault investigation method of marine gas turbine

Technical Field

The application relates to the field of marine gas turbines, in particular to a power turbine rotating speed control fault checking method of a marine gas turbine.

Background

The gas turbine is a power output device, the marine gas turbine adopts a power turbine to output kinetic energy, and the free end of the power turbine is connected with a gear box. The power turbine rotating speed control fault often occurs in the operation process of the gas turbine, the cause of the power turbine rotating speed control fault possibly is more, the current problems that the power turbine rotating speed control fault is difficult to be effectively and quickly checked and repaired are solved, on one hand, the stable operation of the gas turbine is caused to be a great hidden trouble, and on the other hand, the operation of the gas turbine cannot be recovered as soon as possible, so that the working efficiency of the gas turbine is affected.

Disclosure of Invention

The inventor provides a power turbine rotating speed control fault checking method of a marine gas turbine aiming at the problems and the technical requirements, and the technical scheme of the application is as follows:

a power turbine speed control troubleshooting method of a marine gas turbine, the method comprising:

in the running process of the marine gas turbine, when the output shaft of the power turbine has a brake fault, determining that a measuring channel for controlling the rotation speed N _3c of the power turbine has a fault;

When the power turbine is in overspeed fault shutdown, if the power turbine has overspeed fault shutdown, determining a corresponding fault detection result according to the rotation speed relation among the power turbine rotation speed N _3c of the controller, the power turbine rotation speed N _3m of the monitor and the shutdown rotation speed N _{3_stop}, and if the power turbine has overspeed limiter detection signals, determining a corresponding fault detection result according to the detection result of the overspeed limiter detection signals of the power turbine, and according to the rotation speed relation among the power turbine rotation speed N _3c of the controller, the power turbine rotation speed N _3m of the monitor and the shutdown rotation speed N _{3_stop}, wherein N _{3_check} is a rotation speed detection value.

According to a further technical scheme, when N ₃<N_{3_check} is adopted, the method for determining the corresponding fault detection result comprises the following steps:

When the power turbine rotating speed N _3m is inconsistent with the power turbine rotating speed N _3c, determining a collection channel of the power turbine rotating speed with faults according to the shutdown rotating speed N _{3_stop};

When the monitored power turbine speed N _3m is consistent with the controller power turbine speed N _3c, determining that the power turbine overspeed limiter fails or that the power turbine speed N ₃ fails according to the shutdown speed N _{3_stop}.

The further technical scheme is that the acquisition channel for determining the power turbine rotating speed with faults according to the shutdown rotating speed N _{3_stop} comprises the following steps:

When N _3c≥N_{3_stop} and N _3m are in the corresponding working range, determining that a fault exists in the acquisition channel of the power turbine rotating speed N _3c of the controller;

When N _3m≥N_{3_stop} and N _3c are in the corresponding working ranges, the collection channel of the power turbine rotating speed N _3m of the monitoring machine is determined to be faulty.

The further technical scheme is that when the power turbine rotation speed N _3m of the monitoring machine is consistent with the power turbine rotation speed N _3c of the control machine:

If N _3c<N_{3_stop}、N_3m<N_{3_stop} is reached, determining that the overspeed limiter of the power turbine fails;

If N _3c≥N_{3_stop}、N_3m≥N_{3_stop}, it is determined that the overspeed fault exists in the power turbine speed N ₃.

According to a further technical scheme, when N ₃≥N_{3_check} is adopted, the method for determining the corresponding fault detection result comprises the following steps:

If the checking result of the power turbine overspeed limiter checking signal indicates that the power turbine overspeed limiter checking signal is in a normal state, determining a collection channel of the power turbine rotating speed with faults or determining that overspeed faults exist in the power turbine rotating speed N ₃ according to the monitoring power turbine rotating speed N _3m, the control power turbine rotating speed N _3c and the stopping rotating speed N _{3_stop};

If the checking result of the power turbine overspeed limiter checking signal indicates that the power turbine overspeed limiter checking signal is in an abnormal state, determining that the power turbine overspeed limiter fails according to the monitored power turbine rotation speed N _3m, the control power turbine rotation speed N _3c and the shutdown rotation speed N _{3_stop}.

The further technical proposal is that when the power turbine overspeed limiter check signal is in a normal state:

If the power turbine rotating speed N _3m is inconsistent with the power turbine rotating speed N _3c, determining a collection channel of the power turbine rotating speed with faults according to the shutdown rotating speed N _{3_stop};

If the monitored power turbine speed N _3m is consistent with the controller power turbine speed N _3c and N _3c≥N_{3_stop}、N_3m≥N_{3_stop}, then an overspeed fault is determined to exist in the power turbine speed N ₃.

If N _3c≥N_{3_stop} and N _3m are in the corresponding rotating speed range, determining that a measuring channel of the power turbine rotating speed N _3c of the controller fails;

If N _3m≥N_{3_stop} and N _3c are in the corresponding rotation speed range, determining that a measuring channel for monitoring the power turbine rotation speed N _3m fails.

The further technical proposal is that when the power turbine overspeed limiter check signal is in an abnormal state:

If the monitored power turbine speed N _3m is consistent with the controller power turbine speed N _3c and N _3c<N_{3_stop}、N_3m<N_{3_stop}, then the power turbine overspeed limiter is determined to be faulty.

The beneficial technical effects of the application are as follows:

The application discloses a power turbine rotating speed control fault investigation method of a marine gas turbine, which is based on the rotating speed of a power turbine and the rotating speed of a power turbine, and specific phenomena of the power turbine rotating speed control fault are indicated according to the rotating speed of the power turbine.

Drawings

FIG. 1 is a graphical illustration of troubleshooting results for various parameters when a power turbine speed control failure occurs in a marine gas turbine, in accordance with one embodiment of the present application.

Detailed Description

The following describes the embodiments of the present application further with reference to the drawings.

The application discloses a power turbine rotating speed control fault checking method of a marine gas turbine, and the method is shown in a flow chart shown in FIG. 1

In the operation process of the marine gas turbine, when the output shaft of the power turbine has a brake fault, the fault of a measuring channel of the power turbine rotating speed N _3c of the controller is directly determined, and the measuring channel of the power turbine rotating speed N _3c of the controller, including a corresponding rotating speed sensor, is to be checked.

In the operation process of the marine gas turbine, when the power turbine is in overspeed fault shutdown, the power turbine is divided into the following two types according to the rotation speed N ₃ of the power turbine when the fault occurs:

1. If the power turbine rotating speed N ₃<N_{3_check} is the same as the power turbine rotating speed N _3c, the power turbine rotating speed N _3m and the shutdown rotating speed N _{3_stop}, the corresponding fault detection result is determined according to the rotating speed relation of the power turbine rotating speed N _3c, the power turbine rotating speed N _3m and the shutdown rotating speed N _{3_stop}. N _{3_check} is a rotation speed check value. The method for determining the corresponding fault detection result comprises the following steps:

When the power turbine rotating speed N _3m is inconsistent with the power turbine rotating speed N _3c, determining a collection channel of the power turbine rotating speed with faults according to the shutdown rotating speed N _{3_stop}. Specific:

(1.1) when N _3c≥N_{3_stop} and N _3m are within the corresponding operating ranges, determining that there is a fault in the collection channel of the power turbine speed N _3c of the controller, and checking the collection channel of the power turbine speed N _3c of the controller, including the corresponding speed sensor.

(1.2) When N _3m≥N_{3_stop} and N _3c are within the corresponding operating ranges, determining that the collection channel monitoring the power turbine speed N _3m fails, the collection channel monitoring the power turbine speed N _3m should be monitored, including the corresponding speed sensor.

When the monitored power turbine speed N _3m is consistent with the controller power turbine speed N _3c, determining that the power turbine overspeed limiter fails or that the power turbine speed N ₃ fails according to the shutdown speed N _{3_stop}. Specific:

(1.3) if N _3c<N_{3_stop}、N_3m<N_{3_stop}, determining that the power turbine overspeed limiter fails, checking the power turbine overspeed limiter and a rotating speed acquisition channel thereof, wherein the rotating speed acquisition channel comprises a corresponding rotating speed sensor.

(1.4) If N _3c≥N_{3_stop}、N_3m≥N_{3_stop}, determining that the actual overspeed fault exists in the power turbine rotating speed N ₃, and checking mechanical facilities such as a controllable pitch propeller and the like.

2. If the power turbine rotating speed N ₃≥N_{3_check} is at fault, firstly checking the checking signal of the overspeed limiter of the power turbine, and determining the corresponding fault checking result according to the checking result of the checking signal of the overspeed limiter of the power turbine and the rotating speed relation of the power turbine rotating speed N _3c of the controller, the power turbine rotating speed N _3m of the monitor and the shutdown rotating speed N _{3_stop}.

If the checking result of the power turbine overspeed limiter checking signal indicates that the power turbine overspeed limiter checking signal is in a normal state, a collection channel of the power turbine rotating speed with faults is determined according to the monitoring power turbine rotating speed N _3m, the control power turbine rotating speed N _3c and the stopping rotating speed N _{3_stop}, or overspeed faults are determined to exist in the power turbine rotating speed N ₃. Specific:

If the monitored power turbine rotating speed N _3m is inconsistent with the controller power turbine rotating speed N _3c, determining a collection channel of the power turbine rotating speed with faults according to the shutdown rotating speed N _{3_stop}:

(2.1) if N _3c≥N_{3_stop} and N _3m are in the corresponding rotational speed ranges, determining that the measuring channel of the power turbine rotational speed N _3c of the controller fails.

(2.2) If N _3m≥N_{3_stop} and N _3c are in the corresponding rotational speed ranges, determining that the measuring channel of the power turbine rotational speed N _3m of the monitor has a fault.

(2.3) If the monitored power turbine speed N _3m is consistent with the controller power turbine speed N _3c, and N _3c≥N_{3_stop}、N_3m≥N_{3_stop}, determining that an overspeed fault exists in the power turbine speed N ₃.

(2.4) If the monitored power turbine speed N _3m and the controller power turbine speed N _3c are consistent, and N _3c<N_{3_stop}、N_3m<N_{3_stop}, determining that the power turbine overspeed limiter is malfunctioning.

In one example, after a certain gas turbine is successfully started, in the process of running a dry car, a sudden power turbine output shaft brake fault is caused, the power turbine rotating speed N _3c of the controller is directly checked, and through checking, the rotating speed sensor corresponding to the power turbine rotating speed N _3c of the controller is found to be loose with a signal line, and the fault is eliminated after fastening. In this example, the monitored turbine speed N _3m was determined to be 1800r/min and stable by observing the control monitoring cross section, within an empirical operating range. The power turbine speed N _3c of the controller fluctuates within a range of 1800-200 r/min, and the abnormality exists.

In another example, after a gas turbine is continuously operated for 20 hours, the power turbine is shut down at 90% rated condition in sudden overspeed. Rotational speed check value N _{3_check} = 2000r/min, power turbine rotational speed N ₃>N_{3_check} at the time of failure occurrence at 90% rated condition of the gas turbine. The power turbine overspeed limiter check signal is first queried for historical data when a fault occurs and is determined to be in a normal state. Meanwhile, since N _3c＝N_3m =3802 r/min and the shutdown speed N _{3_stop} =3800 r/min, because of N _3c≥N_{3_stop}、N_3m≥N_{3_stop}, it is determined that the overspeed fault exists in the power turbine speed N ₃. Through investigation, the screw pitch is reduced due to the abnormality of the hydraulic oil of the adjustable pitch propeller, so that the rotation speed N ₃ of the fixed power turbine is overspeed, and the gas turbine is restored to stable operation after the fault is removed.

The above is only a preferred embodiment of the present application, and the present application is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present application are deemed to be included within the 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, it is determined that a failure occurs in the measurement channel for controlling the speed N _3c of the power turbine;

When the power turbine shuts down due to an overspeed fault, if the power turbine speed N ₃ <N _{3_check} when the fault occurs, the corresponding fault troubleshooting result is determined according to the speed size relationship among the control engine power turbine speed N _3c , the monitoring engine power turbine speed N _3m and the stop speed N _{3_stop} ; if the power turbine speed N ₃ ≥N _{3_check} when the fault occurs, the power turbine overspeed limiter check signal is first checked, and according to the checking result of the power turbine overspeed limiter check signal, the corresponding fault troubleshooting result is determined according to the speed size relationship among the control engine power turbine speed N _3c , the monitoring engine power turbine speed N _3m and the stop speed N _{3_stop} ; wherein, N _{3_check} is the speed check value.

2. The method according to claim 1, characterized in that, when N ₃ <N _{3_check} , the method for determining the corresponding fault troubleshooting result comprises:

When the monitoring engine power turbine speed N _3m and the control engine power turbine speed N _3c are inconsistent, the acquisition channel of the power turbine speed with fault is determined according to the stop speed N _{3_stop} ;

When the monitoring engine power turbine speed N _3m and the controlling engine power turbine speed N _3c are consistent, it is determined according to the stop speed N _{3_stop} that the power turbine overspeed limiter fails or the power turbine speed N ₃ has an overspeed fault.

3. The method according to claim 2, characterized in that the acquisition channel for determining the speed of the power turbine with a fault according to the stop speed N _{3_stop} comprises:

When N _3c ≥ N _{3_stop} and N _3m is within the corresponding working range, it is determined that the acquisition channel for controlling the motor power turbine speed N _3c is faulty;

When N _3m ≥N _{3_stop} and N _3c is within the corresponding working range, it is determined that the acquisition channel for monitoring the engine power turbine speed N _3m fails.

4. The method according to claim 2, characterized in that when the monitoring motor power turbine speed N _3m and the controlling motor power turbine speed N _3c are consistent:

If N _3c <N _{3_stop} , N _3m <N _{3_stop} , it is determined that the power turbine overspeed limiter fails;

If N _3c ≥N _{3_stop} , N _3m ≥N _{3_stop} , it is determined that the power turbine speed N ₃ has an overspeed fault.

5. The method according to claim 1, characterized in that, when N ₃ ≥ N _{3_check} , the method for determining the corresponding fault troubleshooting result comprises:

If the result of the troubleshooting of the power turbine overspeed limiter check signal indicates that the power turbine overspeed limiter check signal is in a normal state, the acquisition channel of the power turbine speed with a fault is determined according to the monitoring engine power turbine speed N _3m , the control engine power turbine speed N _3c and the stop speed N _{3_stop} , or it is determined that the power turbine speed N ₃ has an overspeed fault;

If the checking result of the power turbine overspeed limiter check signal indicates that the power turbine overspeed limiter check signal is in an abnormal state, it is determined that the power turbine overspeed limiter fails according to the monitoring engine power turbine speed N _3m , the control engine power turbine speed N _3c and the stop speed N _{3_stop} .

6. The method according to claim 5, characterized in that when the power turbine overspeed limiter check signal is in a normal state:

If the monitoring engine power turbine speed N _3m and the control engine power turbine speed N _3c are inconsistent, the acquisition channel of the power turbine speed with a fault is determined according to the stop speed N _{3_stop} ;

If the monitoring engine power turbine speed N _3m and the controlling engine power turbine speed N _3c are consistent, and N _3c ≥ N _{3_stop} , N _3m ≥ N _{3_stop} , it is determined that the power turbine speed N ₃ has an overspeed fault.

7. The method according to claim 6, characterized in that the acquisition channel for determining the speed of the power turbine with a fault according to the stop speed N _{3_stop} comprises:

If N _3c ≥ N _{3_stop} and N _3m is within the corresponding speed range, it is determined that the measurement channel for controlling the motor power turbine speed N _3c is faulty;

If N _3m ≥ N _{3_stop} and N _3c is within the corresponding speed range, it is determined that the measurement channel for monitoring the engine power turbine speed N _3m is faulty.

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 the controlling engine power turbine speed N _3c are consistent, and N _3c <N _{3_stop} , N _3m <N _{3_stop} , it is determined that the power turbine overspeed limiter fails.