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We are having a single Generator, frame V (21 MW) Machine with mark VIe controller. Running in temp IGV Temp control, generator in droop mode, normal load varies 16-19 MW in Naphtha Fuel. Along with GT we are having Grid connection which normally having 4- 5 MW load. Both source work independently.
We are facing load limitation of machine due to fuel flow restriction.
One month back machine could not able to go beyond 20.2 MW, max open IGV 75 with Exhaust temp 512 deg C, while increasing the load FSR1 increases to 75% , LCV servo current responded according to increase in FSR and current goes negative, but magnetic pick up % and fuel flow stop increasing beyond 20.2 MW. Based on trip live data BGGTS (service agency) trouble shoots and asked to replace whole LCV assembly (actuator) with servo valve. We replaced it with new actuator and old (MI removed) servo valve after taking a shut down.
But yesterday again when we tried to take machine to base load with grid synchronization. Machine restricted its load max to 19.5 MW with IGV max opened to 83 deg, fuel flow 1.66 kg/cm2, Magnetic pick up 58 %, FSR1 raised to 72 % with fuel inlet Pr 5.1 Kg/cm2(normal Pr) to 6.2 kg/cm2(We raised it to check any fuel pr problem).
GT screenshots with trip live of yesterday data with grid synch can be access from below mention link.
https://drive.google.com/drive/folders/1DSA8_T4hW1OSjTUMV_Jf-8oMIi5Ts8u5?usp=sharing
Please help us to analyze the problem.
As LCV with servo assembly has been replaced, what could be the fuel limitation factor in machine?
Thanks in Advance
We are facing load limitation of machine due to fuel flow restriction.
One month back machine could not able to go beyond 20.2 MW, max open IGV 75 with Exhaust temp 512 deg C, while increasing the load FSR1 increases to 75% , LCV servo current responded according to increase in FSR and current goes negative, but magnetic pick up % and fuel flow stop increasing beyond 20.2 MW. Based on trip live data BGGTS (service agency) trouble shoots and asked to replace whole LCV assembly (actuator) with servo valve. We replaced it with new actuator and old (MI removed) servo valve after taking a shut down.
But yesterday again when we tried to take machine to base load with grid synchronization. Machine restricted its load max to 19.5 MW with IGV max opened to 83 deg, fuel flow 1.66 kg/cm2, Magnetic pick up 58 %, FSR1 raised to 72 % with fuel inlet Pr 5.1 Kg/cm2(normal Pr) to 6.2 kg/cm2(We raised it to check any fuel pr problem).
GT screenshots with trip live of yesterday data with grid synch can be access from below mention link.
https://drive.google.com/drive/folders/1DSA8_T4hW1OSjTUMV_Jf-8oMIi5Ts8u5?usp=sharing
Please help us to analyze the problem.
As LCV with servo assembly has been replaced, what could be the fuel limitation factor in machine?
Thanks in Advance