Gas turbine exhaust temperature control

[tosif]

We have a SOLAR designed Saturn-10 machine as a driver of compressor. During hunting for a solution of "Exhaust high temperature trip" we are unable to figure out, "How set-point is derived from a preset 'T7 set-point' in exhaust temperature control?". Does anyone has any idea how 'exhaust temperature control mode' actually works and is it's set-point dynamic?

[ibrahim]

tosif, what I can share is some information regarding my experience with Toshiba control systems installed for GE gas turbine. In its exhaust temperature control mode, it manipulates fuel flow in order to provide a controlled temperature increase or decrease and an upper limit for normal operation (also called 'high exhaust cutout or shutdown'). So this control mode will be looking values from three remote setpoints; maximum exhaust temperature (fix value as per vendor), increase rate and decrease rate (i.e. change in temperature per unit time as a function of machine speed, fuel flow and maximum allowable temperature; and that value will obviously dynamic). Hope all gas turbines normally have same protections (and preventions) and this may give you an idea of what you required.