Hi all,
Gas turbine: GE 9001E, 110MW
During starting up on gas, at 60% TNH after the cranking motor cut off the flame started to become very unstable and sometimes the unit tripped on flame out.
With regards to this problem, first we verify the flame detector (honeywell), carried the flame test for all 4 detectors, and all cable are tested. There were no findings. The intensity is good when we carried out the test. We also checked on the GCV by stroking. There is no abnormalities on the feedbacks by the lVDT. the FSG feedback is still same with the correspond opening in mm. All seems normal.
Yesterday, during starting up, we found out the turbine acceleration gradient is started to slow down from 47%TNH, before it fails at 60%TNH due to no flame. However the TMGV seems normal. The detail trending is as follows:
https://drive.google.com/open?id=0B_Y8r2_zrcTSdnJiVGlQaFQ4UHc
We still do not know the root cause. Is it due to torque converter vanes failure? Drain solenoid passing?
Gas turbine: GE 9001E, 110MW
During starting up on gas, at 60% TNH after the cranking motor cut off the flame started to become very unstable and sometimes the unit tripped on flame out.
With regards to this problem, first we verify the flame detector (honeywell), carried the flame test for all 4 detectors, and all cable are tested. There were no findings. The intensity is good when we carried out the test. We also checked on the GCV by stroking. There is no abnormalities on the feedbacks by the lVDT. the FSG feedback is still same with the correspond opening in mm. All seems normal.
Yesterday, during starting up, we found out the turbine acceleration gradient is started to slow down from 47%TNH, before it fails at 60%TNH due to no flame. However the TMGV seems normal. The detail trending is as follows:
https://drive.google.com/open?id=0B_Y8r2_zrcTSdnJiVGlQaFQ4UHc
We still do not know the root cause. Is it due to torque converter vanes failure? Drain solenoid passing?