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We have 4 units 6551B GE gas turbines which recently being in a processs to be in part of a combined cycle of 210 MW. We are foreseeing a problem of high exhaust temperature may cause our HRSG to trip when GT exhaust temperature (TTXM) would rise due to frequent freequency excursion (from 49.5 to 50.5) in our country. In droop mode, unit running at Base load with FSR temperature control, and if frequency falls too much that time, the TTXM increases.
My questions are:
1. Can we set FSR at manual control to reduce fuel (for a very few minutes) so as to contain TTXM so that HRSG have no effect because of sudden rise in flue gas temperature?
2. I f we do so, is there any other effect on running the unit smoothly in Base load (except reduction in MW output)?
3. If it is permissible to control FSR manually by OEM, how should I do it? We have two target buttons as FSR-GAG PRE-SET & FSR-GAG SET-POINT in the sub menu (Fuel Control) of User Define Display menu.
Any advice will be greatly appreciated.
MMA
My questions are:
1. Can we set FSR at manual control to reduce fuel (for a very few minutes) so as to contain TTXM so that HRSG have no effect because of sudden rise in flue gas temperature?
2. I f we do so, is there any other effect on running the unit smoothly in Base load (except reduction in MW output)?
3. If it is permissible to control FSR manually by OEM, how should I do it? We have two target buttons as FSR-GAG PRE-SET & FSR-GAG SET-POINT in the sub menu (Fuel Control) of User Define Display menu.
Any advice will be greatly appreciated.
MMA