A Troubleshooting Method for Over-temperature Fault Shutdown of Marine Gas Turbines

Abstract

The present application discloses a method for troubleshooting over-temperature shutdown of a marine gas turbine, which relates to the field of marine gas turbines. This method analyzes and troubleshoots two different stages of over-temperature occurrence during the starting process and the operating conditions of the marine gas turbine, and determines that the over-temperature shutdown during the starting process stage is caused by abnormal initial system states. During the operating conditions stage, the corresponding troubleshooting results are determined according to the temperature relationship between the average temperature after the low-pressure turbine of the monitoring machine and the average temperature after the low-pressure turbine of the control machine. This method points out a targeted troubleshooting method according to the specific phenomena of over-temperature faults. This method is practical and can efficiently troubleshoot over-temperature shutdown faults of gas turbines, which is of great significance for restoring the stable operation of gas turbines.

Description

Technical Field

[0001] The present application relates to the field of marine gas turbines, and particularly to a method for troubleshooting over-temperature fault shutdown of a marine gas turbine. Background Art

[0002] To ensure the safe operation of the unit, the gas turbine has a temperature control function, that is, it shuts down when an over-temperature fault occurs. When the gas turbine experiences an over-temperature shutdown, the fault causing the over-temperature shutdown should be troubleshot as soon as possible. However, there are many situations that may cause the over-temperature fault shutdown of the gas turbine, and it is often difficult to effectively and quickly troubleshoot, posing a major hidden danger to the stable operation of the gas turbine. Summary of the Invention

[0003] In view of the above problems and technical requirements, the applicant has proposed a method for troubleshooting over-temperature fault shutdown of a marine gas turbine. The technical solution of the present application is as follows:

[0004] A method for troubleshooting over-temperature fault shutdown of a marine gas turbine, the method comprising:

[0005] When an over-temperature fault shutdown occurs during the startup process of the marine gas turbine, determine that the initial system state of the marine gas turbine is abnormal and conduct troubleshooting;

[0006] When an over-temperature fault shutdown occurs during the operating condition stage of the marine gas turbine, if the high-pressure compressor speed N2 at the time of the fault < N0, then according to the average temperature T0 after the low-pressure turbine of the monitoring machine 4m , the average temperature T0 after the low-pressure turbine of the control machine 4c and the temperature relationship with the first shutdown protection temperature T0 4A to determine the corresponding troubleshooting result; if the high-pressure compressor speed N2 ≥ N0 at the time of the fault, then according to the average temperature T0 after the low-pressure turbine of the monitoring machine 4m , the average temperature T0 after the low-pressure turbine of the control machine 4c , the first shutdown protection temperature T0 4A and the second shutdown protection temperature T0 4B to determine the corresponding troubleshooting result; N0 is the speed set value, T0 4A <T0 4B .

[0007] A further technical solution thereof is that when N2 < N0, the method for determining the corresponding troubleshooting result includes:

[0008] When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are inconsistent, determine the acquisition channel of the average temperature where the fault exists according to the first shutdown protection temperature T0 4A .

[0009] When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are consistent, according to the first shutdown protection temperature T0 4A it is determined that the pulse temperature regulator fails or the gas temperature after the low-pressure turbine is over-temperature

[0010] Its further technical solution is that according to the first shutdown protection temperature T0 4A the acquisition channels of the average temperature with faults are determined, including:

[0011] When T0 4m ≥ T0 4A and T0 4c is within the corresponding working range, it is determined that the acquisition channel of the average temperature T0 after the low-pressure turbine of the monitoring machine 4m has a fault;

[0012] When T0 4c ≥ T0 4A and T0 4m is within the corresponding working range, it is determined that the acquisition channel of the average temperature T0 after the low-pressure turbine of the control machine 4c has a fault.

[0013] Its further technical solution is that when the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are consistent:

[0014] If T0 4m < T0 4A and T0 4c < T0 4A it is determined that the pulse temperature regulator fails;

[0015] If T0 4m ≥ T0 4A and T0 4c ≥ T0 4A first, the function of the pulse temperature regulator is checked. If it is determined that the pulse temperature regulator has no fault, it is determined that the gas temperature after the low-pressure turbine is over-temperature.

[0016] Its further technical solution is that when N2 ≥ N0, the method for determining the corresponding fault troubleshooting result includes:

[0017] When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are inconsistent, according to the second shutdown protection temperature T0 4BThe acquisition channel for determining the average temperature with a fault

[0018] When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m is the same as the average temperature T0 after the low-pressure turbine of the control machine 4c Based on the first shutdown protection temperature T0 4A and the second shutdown protection temperature T0 4B It is determined that the acquisition channel of the high-pressure compressor speed N2 has a fault, or the pulse temperature regulator has a fault, or there is an over-temperature fault in the gas temperature after the low-pressure turbine.

[0019] Its further technical solution is that based on the second shutdown protection temperature T0 4B The acquisition channel for determining the average temperature with a fault includes:

[0020] When T0 4m ≥T0 4B and T0 4c is within the corresponding working range, it is determined that the acquisition channel of the average temperature T0 after the low-pressure turbine of the monitoring machine 4m has a fault;

[0021] When T0 4c ≥T0 4B and T0 4m is within the corresponding working range, it is determined that the acquisition channel of the average temperature T0 after the low-pressure turbine of the control machine 4c has a fault.

[0022] Its further technical solution is that when the average temperature T0 after the low-pressure turbine of the monitoring machine 4m is the same as the average temperature T0 after the low-pressure turbine of the control machine 4c :

[0023] When T0 4A <T0 4m <T0 4B 、T0 4A <T0 4c <T0 4B If there is a fluctuation in the high-pressure compressor speed N2, it is determined that the acquisition channel of the high-pressure compressor speed N2 has a fault; if there is no fluctuation in the high-pressure compressor speed N2, it is determined that the pulse temperature regulator has a fault;

[0024] When T0 4m ≥T0 4B and T0 4c ≥T0 4B First, a function check is performed on the pulse temperature regulator. If it is determined that the pulse temperature regulator has no fault, it is determined that there is an over-temperature fault in the gas temperature after the low-pressure turbine.

[0025] A further technical solution is to determine that the initial system state of the marine gas turbine is abnormal and conduct troubleshooting, including:

[0026] When the rising rate of the gas temperature in the starting process stage exceeds the first rate threshold and the fuel supply rate exceeds the second rate threshold, it is determined that the fuel supply amount of the fuel assembly is unreasonable and too large.

[0027] When the rising rate of the gas temperature and the compressor speed in the starting process stage is less than the third rate threshold and the gas temperature continues to rise, it is determined that the gas turbine has a thermal hang-up. First, check the state of the anti-surge bleed valve of the high-pressure compressor. When it is determined that the anti-surge bleed valve of the high-pressure compressor has no fault, check the static value of the gas temperature after the low-pressure turbine before starting.

[0028] The beneficial technical effects of this application are:

[0029] This application discloses a troubleshooting method for over-temperature shutdown of a marine gas turbine. By analyzing and troubleshooting two different stages of over-temperature occurrence, namely the starting process and the operating conditions of the marine gas turbine, and according to the specific phenomena of the over-temperature fault, a targeted troubleshooting method is pointed out. This method is practical and can efficiently troubleshoot the over-temperature shutdown fault of the gas turbine, which is of great significance for restoring the stable operation of the gas turbine. Description of the Drawings

[0030] Figure 1 It is the troubleshooting result under various different parameter conditions when the marine gas turbine has an over-temperature fault shutdown in an embodiment of this application. Detailed Embodiments

[0031] The following further describes the detailed embodiments of this application with reference to the drawings.

[0032] This application discloses a troubleshooting method for over-temperature shutdown of a marine gas turbine. Please refer to Figure 1 the flowchart shown, and this method includes the following steps:

[0033] First, distinguish the stages of over-temperature fault shutdown, including two major categories:

[0034] 1. When the marine gas turbine has an over-temperature fault shutdown in the starting process stage, determine that the initial system state of the marine gas turbine is abnormal and conduct troubleshooting. There are mainly two situations:

[0035] When the rising rate of the gas temperature in the starting process stage exceeds the first rate threshold and the fuel supply rate exceeds the second rate threshold, that is, the gas temperature rises faster than normal during the starting process and the fuel supply rate is fast, it is determined that the fuel supply amount of the fuel assembly is unreasonable and too large. The starting screw on the fuel assembly should be adjusted counterclockwise to reduce the fuel supply amount in the first half of the starting process.

[0036] When the rising rate of the gas temperature and the compressor speed in the starting process stage is less than the third rate threshold and the gas temperature continues to rise, that is, when the speed increase of the compressor stalls and the gas temperature continues to rise, it is determined that the gas turbine has a thermal hang. When it is determined that the over-temperature fault shutdown is caused by a thermal hang, first check the status of the anti-surge bleed valve of the high-pressure compressor. When the anti-surge bleed valve of the high-pressure compressor is not opened or closed earlier than the specified procedure, it is determined that the status of the anti-surge bleed valve of the high-pressure compressor is abnormal and there is a fault. Otherwise, it is determined that the anti-surge bleed valve of the high-pressure compressor has no fault, and then check the static value of the gas temperature T04 after the low-pressure turbine before starting. Specifically, check whether the static value of the gas temperature T04 after the low-pressure turbine is higher than usual. If it is higher, more cold blows should be taken to reduce the static value of the gas temperature T04 after the low-pressure turbine.

[0037] II. When the marine gas turbine experiences an over-temperature fault shutdown during the operating condition stage, it is determined that there are abnormalities in the parameters during the operation of the marine gas turbine. Then, it is classified into the following two categories according to the magnitude of the high-pressure compressor speed N2 at the time of the fault:

[0038] 1. If the high-pressure compressor speed N2 < N0 at the time of the fault, then according to the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c and the first shutdown protection temperature T0 4A to determine the corresponding fault troubleshooting results, where N0 is the speed set value. The method for determining the corresponding fault troubleshooting results is as follows:

[0039] When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are inconsistent, determine the acquisition channel of the average temperature with a fault according to the first shutdown protection temperature T0 4A . Specifically:

[0040] (1.1) When T0 4m ≥T0 4A and T0 4c is within the corresponding working range, it is determined that there is a fault in the acquisition channel of the average temperature T0 after the low-pressure turbine of the monitoring machine 4m , and the temperature sensor corresponding to the acquisition channel of the average temperature T0 after the low-pressure turbine of the monitoring machine 4m should be checked.

[0041] (1.2) When T0 4c ≥T0 4A and T0 4m is within the corresponding working range, it is determined that there is a fault in the acquisition channel of the average temperature T0 after the low-pressure turbine of the control machine 4cThere is a fault in the acquisition channel, and the average temperature T0 after the low-pressure turbine of the control machine should be checked. 4c The temperature sensor corresponding to the acquisition channel.

[0042] When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m is the same as the average temperature T0 after the low-pressure turbine of the control machine 4c it is determined that there is no fault in the acquisition channels of the two average temperatures. Then, according to the first shutdown protection temperature T0 4A it is determined that the pulse temperature regulator fails or there is an over-temperature fault in the gas temperature after the low-pressure turbine. Specifically:

[0043] (1.3) If T0 4m < T0 4A 、T0 4c < T0 4A it is determined that the pulse temperature regulator fails, and the pulse temperature regulator and the temperature sensor corresponding to its acquisition channel should be checked.

[0044] (1.4) If T0 4m ≥ T0 4A 、T0 4c ≥ T0 4A first, perform a function check on the pulse temperature regulator. If it is determined that the pulse temperature regulator has no fault, it is determined that there is an over-temperature fault in the gas temperature after the low-pressure turbine, and the fuel system, compressor, combustion chamber, etc. need to be checked.

[0045] 2. If the high-pressure compressor speed N2 ≥ N0 when the fault occurs, then according to the average temperature T0 after the low-pressure turbine of the monitoring machine 4m 、the average temperature T0 after the low-pressure turbine of the control machine 4c 、the first shutdown protection temperature T0 4A and the second shutdown protection temperature T0 4B to determine the corresponding fault troubleshooting results. N0 is the speed set value, and T0 4A < T0 4B . The method for determining the corresponding fault troubleshooting results is:

[0046] When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m is different from the average temperature T0 after the low-pressure turbine of the control machine 4c according to the second shutdown protection temperature T0 4B to determine the acquisition channel of the average temperature with a fault. Specifically:

[0047] (2.1) When T0 4m ≥ T0 4B and T0 4c is within the corresponding working range, it is determined that the average temperature T0 after the low-pressure turbine of the monitoring machine4m There is a fault in the acquisition channel.

[0048] (2.2) When T0 4c ≥T0 4B And T0 4m When within the corresponding working range, determine the average temperature T0 after the low-pressure turbine of the control machine 4c There is a fault in the acquisition channel.

[0049] (2.3) When T0 4A <T0 4m <T0 4B 、T0 4A <T0 4c <T0 4B When the high-pressure compressor speed N2 is detected, first check it. If the high-pressure compressor speed N2 fluctuates, it is determined that the acquisition channel of the high-pressure compressor speed N2 is faulty. If the high-pressure compressor speed N2 does not fluctuate, it is determined that the pulse temperature regulator is faulty.

[0050] (2.4) When T0 4m ≥T0 4B And T0 4c ≥T0 4B When the pulse temperature regulator is faulty, first perform a functional check on the pulse temperature regulator. If it is determined that the pulse temperature regulator is not faulty, it is determined that the gas temperature after the low-pressure turbine is over-temperature, and it is necessary to check the fuel system, compressor, combustion chamber, etc.

[0051] In an application example, after a gas turbine is started, the high-pressure compressor speed N2 rises from 2000r / min to 4800r / min and then stops rising, while the low-pressure turbine after-gas temperature T04 gradually increases to 600℃ and reaches the temperature protection value, causing the gas turbine to shut down due to over-temperature fault. Since the over-temperature fault shutdown occurs during the startup process, and the compressor speed stagnates while the gas temperature continues to rise, it is determined that the gas turbine has thermal suspension according to the method of this application. First, check the high-pressure compressor anti-surge bleed valve to determine that the high-pressure compressor anti-surge bleed valve is opened normally according to the program and operates normally, thereby determining that there is no fault in the high-pressure compressor anti-surge bleed valve. Then query the historical data and find that the static value of the low-pressure turbine after-gas temperature T04 before startup is 180℃, while the previous experience data is generally only 30℃~120℃, so it can be determined that the static value of the low-pressure turbine after-gas temperature T04 is too high, resulting in over-temperature fault shutdown caused by thermal suspension. After the fault was identified, the unit was shut down and cold blown several times, so that the static value of the low-pressure turbine after-gas temperature T04 dropped to 60°C. The gas turbine was then started, and finally the gas turbine was successfully started and entered operating condition.

[0052] In another application example, after a gas turbine was started and entered the operating condition and ran continuously for 50 hours, it suddenly shut down due to over-temperature failure at 80% of the rated operating condition. Since the over-temperature failure shutdown occurred during the operating condition, the comparison of T0 4m and T0 4c , judge T0 4m and T0 4c If both are within their respective working ranges (80% rated working condition T04 is between 640 and 660°C) and are in normal state, it is determined that both average temperature acquisition channels have no faults and the faults occur in other components. In this embodiment, the high pressure compressor speed N2 = 8600 r / min, the speed setting value N0 = 8000 r / min, and the two shutdown protection values ​​T0 4A =600℃、T0 4B =800℃, since N2≥N0, and T0 4A <T0 4m <T0 4B 、T0 4A <T0 4c <T0 4B , first check whether the high-pressure compressor speed N2 fluctuates. After querying the operating data, it was found that the high-pressure compressor speed of the control machine fluctuated. When the fault occurred, the high-pressure compressor speed fluctuated from 8610r / min to 7950r / min, causing the control system to judge that the high-pressure compressor speed was lower than the speed setting value and T04 was 650℃, which was higher than the shutdown protection value T0 4A It can be determined that the over-temperature fault shutdown is caused by a fault in the acquisition channel of the high-pressure compressor speed N2. Finally, through the inspection of the acquisition channel of the high-pressure compressor speed of the control machine, it was found that the high-pressure speed acquisition board of the control machine was abnormal. After replacement, the fault was eliminated.

[0053] 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 the over-temperature fault shutdown of a marine gas turbine, characterized in that, The method comprises: When the marine gas turbine shuts down due to an over-temperature fault during the startup process, determining that the initial system state of the marine gas turbine is abnormal and conducting troubleshooting; When the marine gas turbine experiences an over-temperature fault shutdown during the operating condition stage, if the high-pressure compressor speed N2 at the time of the fault < N0, then based on the average temperature T0 after the low-pressure turbine of the monitoring machine 4m , the average temperature T0 after the low-pressure turbine of the control machine 4c and the first shutdown protection temperature T0 4A , determine the corresponding fault troubleshooting results according to the temperature magnitude relationship; if the high-pressure compressor speed N2 at the time of the fault ≥ N0, then based on the average temperature T0 after the low-pressure turbine of the monitoring machine 4m , the average temperature T0 after the low-pressure turbine of the control machine 4c , the first shutdown protection temperature T0 4A and the second shutdown protection temperature T0 4B , determine the corresponding fault troubleshooting results; N0 is the speed set value, T0 4A < T0 4B .

2. The method according to claim 1, wherein When N2 <N0时,确定对应的故障排查结果的方法包括: When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are inconsistent, determine the acquisition channel of the average temperature where the fault exists according to the first shutdown protection temperature T0 4A ; When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m is the same as the average temperature T0 after the low-pressure turbine of the control machine 4c and in accordance with the first shutdown protection temperature T0 4A it is determined that the pulse temperature regulator has failed or there is an over-temperature fault in the gas temperature after the low-pressure turbine.

3. The method according to claim 2, characterized in that, The acquisition channel for determining the average temperature of the fault existing according to the first shutdown protection temperature T0 4A includes: When T0 4m ≥ T0 4A and T0 4c is within the corresponding operating range, it is determined that there is a fault in the acquisition channel of the average temperature T0 4m behind the low-pressure turbine of the monitoring machine; When T0 4c ≥ T0 4A and T0 4m is within the corresponding operating range, it is determined that there is a fault in the acquisition channel of the average temperature T0 4c after the low-pressure turbine of the control machine.

4. The method according to claim 2, wherein When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are the same: If T0 4m <T0 4A , T0 4c <T0 4A , it is determined that the pulse temperature regulator has failed; If T0 4m ≥ T0 4A and T0 4c ≥ T0 4A , first perform a function check on the pulse temperature regulator. If it is determined that the pulse temperature regulator is fault-free, then it is determined that there is an over-temperature fault in the gas temperature after the low-pressure turbine.

5. The method according to claim 1, characterized in that When N2 ≥ N0, the method for determining the corresponding troubleshooting result includes: When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are inconsistent, the acquisition channel of the average temperature with a fault is determined according to the second shutdown protection temperature T0 4B ; When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m is the same as the average temperature T0 after the low-pressure turbine of the control machine 4c and in accordance with the first shutdown protection temperature T0 4A as well as the second shutdown protection temperature T0 4B it is determined that there is a failure in the acquisition channel of the high-pressure compressor speed N2, or a failure in the pulse temperature regulator, or an over-temperature failure in the gas temperature after the low-pressure turbine.

6. The method according to claim 5, wherein The acquisition channel for determining the average temperature of the fault existing according to the second shutdown protection temperature T0 4B includes: When T0 4m ≥ T0 4B and T0 4c is within the corresponding operating range, it is determined that there is a fault in the acquisition channel of the average temperature T0 4m behind the low-pressure turbine of the monitoring machine; When T0 4c ≥ T0 4B and T0 4m is within the corresponding operating range, it is determined that there is a fault in the acquisition channel of the average temperature T0 4c behind the low-pressure turbine of the control machine.

7. The method according to claim 5, wherein When the average temperature T0 after the low-pressure turbine of the monitoring machine 4m and the average temperature T0 after the low-pressure turbine of the control machine 4c are the same: When T0 4A <T0 4m <T0 4B and T0 4A <T0 4c <T0 4B If there is a fluctuation in the high-pressure compressor speed N2, it is determined that the acquisition channel of the high-pressure compressor speed N2 has a fault; if there is no fluctuation in the high-pressure compressor speed N2, it is determined that the pulse temperature regulator has a fault; When T0 4m ≥ T0 4B and T0 4c ≥ T0 4B At this time, first perform a functional check on the pulse temperature regulator. If it is determined that the pulse temperature regulator has no faults, then it is determined that there is an over-temperature fault in the gas temperature after the low-pressure turbine.

8. The method according to claim 1, wherein The determining that the initial system state of the marine gas turbine is abnormal and conducting troubleshooting includes: When the gas temperature rising rate during the starting process exceeds the first rate threshold, and the fuel supply rate exceeds the second rate threshold, it is determined that the fuel supply amount of the fuel assembly is unreasonable and too large; When the rate of increase of the gas temperature and compressor speed during the startup process is less than the third rate threshold and the gas temperature continues to rise, it is determined that the gas turbine has thermal suspension. First, check the status of the high-pressure compressor anti-surge air valve. When it is determined that the high-pressure compressor anti-surge air valve is not faulty, check the static value of the low-pressure turbine rear gas temperature before startup.

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