15 years ago
I am looking for help to build a dynamic simulation of a boiler drum
level. Issues that are important to capture include:
- inverse response of the level to changes in drum pressure, steam
flow, boiler feedwater flow and boiler firing.
- difference in behaviour between small and large disturbance
- level measurement errors as a function of pressure.
I am evaluating the drum level control tuning of different boilers in
an oil refinery. One big problem is that the dynamic response of the
steam drum levels on small and large disturbances could be very
different. We want to know how optimum the tuning is under large steam
upset conditions, and this is for obvious reasons difficult to test on
a real plant. I want to build a useful simulation to tune the PID
controllers and to test other rule and model based algorithms so that
we can have confidence in the performance of the boiler drum level
As an example if what I want to do, I recently build a very simple yet
very useful simulation of a compressor anti-surge control system and
this allowed us to have enough confidence in that specific, previously
suspect, control scheme. I am a bit unsure how to capture the shrink
and swell effects of the boiler drum level adequately, especially the
difference in behaviour under small and large upset conditions, to
allow me to do the same for the boiler drum level applications.
I will appreciate help on this appliction.