V
We are operating GE Frame 6B GT with Mark V- TMR control, Simple Cycle. (HMI -Windows NT, CIMPROJ).
During the re-commissioning of one of our GT after the Combustion Inspection, all the four flame appeared at 19% TNH and two flames disappear at 22% of speed (can# 3 & 8) and again reappeared at 28% (approx) speed (on Gas Fuel). ( flame failure trip logic is 3 out of 4) Unit loaded, checked all parameters found normal.
During the normal shutdown ‘CHAMBER FLAMED OUT DURING SHUTDOWN’ alarm appeared at 39 % (approx) of speed.
Subsequent start-up and shutdown same thing is repeating.
Gas Inlet Pressure is 23 Bar (FGUP), we are having 3 Nos FPG2 transmitters, 2 LVDTs each for SRV and GCV, not using any barriers, SRV-GCV is a single moulded unit .
Please see the startup trend in below link
http://www.speedyshare.com/files/25803231/AD_GT1.JPG
Liquid fuel operations, startup and base load and fuel changeover everything found perfect.
Following parts replaced during the CI: Dual Fuel Nozzle, Liner, Transition pieces and cross fire tubes all from OEM. We do not have much detail about the parts.
After the incident following checks were carried out:
SRV and GCV calibration checked (Stroke length, feed back etc) found OK, not changed existing IO-config values. Not used Auto-Cal feature. Not changed moog servo valves.
SRV
Current Gain: 1.93
Current Bias: 2.7
GCV
Current Gain: 1.92
Current Bias: 2.7
Following constants as found
FSKSU_GASFI -17.60%
FSKSU_GASWU—11.3%
FSKSU_LIQFI—22.00%
FSKSU_LIQWU—18.50
FSKMINU2—FSRMIN FSR corner2-start up(=FSRWU)--11%
Shutdown FSRs
FSKMIND1—6.60%
FSKMIND2—8.82%
FSKMIND3—9.80%
FSKMIND4—11.30%
Shutdown speed
FSKMINN1—5%
FSKMINN2—40%
FSKMINN3—82%
FSKMINN4—85%
FPG2 pressure Transmitter(3 Nos)calibrated,found OK.
flame scanners rechecked , found OK .
Unit is in operation now (on gas).
Kindly give your advices to sort out the issue.
Thanks in advance.
During the re-commissioning of one of our GT after the Combustion Inspection, all the four flame appeared at 19% TNH and two flames disappear at 22% of speed (can# 3 & 8) and again reappeared at 28% (approx) speed (on Gas Fuel). ( flame failure trip logic is 3 out of 4) Unit loaded, checked all parameters found normal.
During the normal shutdown ‘CHAMBER FLAMED OUT DURING SHUTDOWN’ alarm appeared at 39 % (approx) of speed.
Subsequent start-up and shutdown same thing is repeating.
Gas Inlet Pressure is 23 Bar (FGUP), we are having 3 Nos FPG2 transmitters, 2 LVDTs each for SRV and GCV, not using any barriers, SRV-GCV is a single moulded unit .
Please see the startup trend in below link
http://www.speedyshare.com/files/25803231/AD_GT1.JPG
Liquid fuel operations, startup and base load and fuel changeover everything found perfect.
Following parts replaced during the CI: Dual Fuel Nozzle, Liner, Transition pieces and cross fire tubes all from OEM. We do not have much detail about the parts.
After the incident following checks were carried out:
SRV and GCV calibration checked (Stroke length, feed back etc) found OK, not changed existing IO-config values. Not used Auto-Cal feature. Not changed moog servo valves.
SRV
Current Gain: 1.93
Current Bias: 2.7
GCV
Current Gain: 1.92
Current Bias: 2.7
Following constants as found
FSKSU_GASFI -17.60%
FSKSU_GASWU—11.3%
FSKSU_LIQFI—22.00%
FSKSU_LIQWU—18.50
FSKMINU2—FSRMIN FSR corner2-start up(=FSRWU)--11%
Shutdown FSRs
FSKMIND1—6.60%
FSKMIND2—8.82%
FSKMIND3—9.80%
FSKMIND4—11.30%
Shutdown speed
FSKMINN1—5%
FSKMINN2—40%
FSKMINN3—82%
FSKMINN4—85%
FPG2 pressure Transmitter(3 Nos)calibrated,found OK.
flame scanners rechecked , found OK .
Unit is in operation now (on gas).
Kindly give your advices to sort out the issue.
Thanks in advance.