K
In gas turbine, the purpose of SRV and GCV valves are understandable. Closed loop of GCV with setpoint given by FSR and feedback is from LVDT.
But, in SRV the valve setpoint is given by Turbine speed (converted to pressure) and feedback is taken from both Pressure transmitter and LVDT.
Doubts:
*set point is speed converted to pressure.this is understood that during start up from 0 to 100% Speed; to make fuel flow inside the pressurized combustion chamber inter valve pressure is increased.
But after synchronization, speed is constant, so setpoint will be constant. When Load is increased, fuel flow should be increased. So, inter-valve pressure should be increased. how this factor is included in the control logic?
*why two feedback for SRV.
-pressure Transmitter feedback
-LVDT feedback
why this two? and how its used in control logic.
But, in SRV the valve setpoint is given by Turbine speed (converted to pressure) and feedback is taken from both Pressure transmitter and LVDT.
Doubts:
*set point is speed converted to pressure.this is understood that during start up from 0 to 100% Speed; to make fuel flow inside the pressurized combustion chamber inter valve pressure is increased.
But after synchronization, speed is constant, so setpoint will be constant. When Load is increased, fuel flow should be increased. So, inter-valve pressure should be increased. how this factor is included in the control logic?
*why two feedback for SRV.
-pressure Transmitter feedback
-LVDT feedback
why this two? and how its used in control logic.