R
We have a waste heat recovery boiler that is supplied by exhaust of a 20MW Gas Turbine. We've seen that at lower turbine loads (75% and below) the three element drum level controller cannot maintain the drum level at desired setpoint. As soon as the load on the Gas Turbine is increased to more than 75% of rated load, the stability keeps getting better. At rated load (20MW) the drum level is very stable and close to the setpoint.
Can anyone please help with information on how to keep the drum level stable at lower turbine loads?
Can anyone please help with information on how to keep the drum level stable at lower turbine loads?