I am working on a GE Frame 6 Gas Turbine having an ISO rating of 37.5 MW. The control system hooked with it is Invensys Triconex TMR system. It has a provision of Steam Injection for Nox control which currently is inactive due to unavailability of WHRB.

Invensys claimed that they have replicated all the GE logic and also I personally verified all important Control Constant which are matching with the GE control constants. However their way of implementation is different but the final o/p seems to be matching with the desired o/p.

My query over here is that I am suspecting the O/P of our Gas Turbine at base load under ambient condition (10-15 Deg C) is less that it should be. I have gone through many threads before but I could not found the formula for relation between TTRX and CPD. In our case CPD is 9.6 bar. is there any way or formula to verify that the O/P at base load will not exceed what we are getting now based on the CPD bias curve.

 

I don't know what the history of your machine is, it has obviously had a control retro-fit at some time in it's life. When the machine was installed there should have been a set of performance Spec. data for the specific machine.At 37.5 Mw it looks like you have a PG6531(B). Nameplate should show Output at Exhaust Temp. at CPD at 15Deg. C Part of this data is a graph showing estimated performance vs. Compressor Inlet Temp. (Note, Inlet temp. not CPD)This graph will show 100% output (In your case 37.5 MW)at 15 Deg.C and %age variation in output above and below that temperature. From a generic spec. that I have, 0.02% change in Output is equal to about 3 Deg. C.

Maybe someone out there has a Spec. for PG6531, I don't have one at my finger tips here.