Taking a 300 MW oxy-coal fired boiler unit as the research object

the integrated modular modeling system(IMMS)was applied to establish the dynamic simulation model for the whole unit.Under the BMCR condition

the effects of coal feeder speed and primary recirculation fan damper opening degree on the combustion and flue gas systems of the boiler were analyzed.The results show that

the coal feeder speed disturbance has great direct influence on flue gas flow and heat transfer in the combustion and flue gas system

it also has a certain effect on the parameters of the flue gas and steam.Factors such as the primary recirculation fan damper opening disturbance

the secondary recirculation fan speed disturbance and the compressor speed disturbance mainly affect the flue gas flow

and then affect the heat transfer of the unit

while they have relatively weak influence on the steam parameters.