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Frame 6 GT with Mark V (TMR) control.
Recently we replaced Fuel nozzle because we faced combustion trouble alarm at 25 MW. Swapped the nozzle between hot and cold area still spread was found high SP1=56,SP2=46,SP3=44 deg C.
OEM suggested replace all the fuel nozzle. Now we are facing high exhaust spread issue at FSNL, 70, 69,68 Deg C SP1, SP2 and SP3 respectively on gas fuel and Unit tripping on High Exhaust spread alarm. We observed that 20% to 97 % TNH flame was OK in all four cans but after 97% flame lost in the can No. 3 . ( compressor bleed valve closing at 95% Speed)
But the second attempt, immediately after reaching zero speed unit started on gas and everything found normal. FSNL spread was less than 15 Deg C. Unit loaded all the load up to base load everything found OK.
This unit is normally used for the peaking purpose.
OEM suggested to check SRV/GCV calibration, Inlet pressure, Gas composition, filters etc.
All are found Normal.
Last four startup we observed the following :
1. first attempt 20 % to 97 % TNH flame OK > 97% TNH flame out in Can 3 and high exhaust spread alarm observed.
2.Second attempt every thing found normal, unit synchronized and running normal.
Any body can help? Any suggestion?
Recently we replaced Fuel nozzle because we faced combustion trouble alarm at 25 MW. Swapped the nozzle between hot and cold area still spread was found high SP1=56,SP2=46,SP3=44 deg C.
OEM suggested replace all the fuel nozzle. Now we are facing high exhaust spread issue at FSNL, 70, 69,68 Deg C SP1, SP2 and SP3 respectively on gas fuel and Unit tripping on High Exhaust spread alarm. We observed that 20% to 97 % TNH flame was OK in all four cans but after 97% flame lost in the can No. 3 . ( compressor bleed valve closing at 95% Speed)
But the second attempt, immediately after reaching zero speed unit started on gas and everything found normal. FSNL spread was less than 15 Deg C. Unit loaded all the load up to base load everything found OK.
This unit is normally used for the peaking purpose.
OEM suggested to check SRV/GCV calibration, Inlet pressure, Gas composition, filters etc.
All are found Normal.
Last four startup we observed the following :
1. first attempt 20 % to 97 % TNH flame OK > 97% TNH flame out in Can 3 and high exhaust spread alarm observed.
2.Second attempt every thing found normal, unit synchronized and running normal.
Any body can help? Any suggestion?