The mathematic model for relationship between and among energy transfer

flow loss and pressure ratio in stages of centrifugal compressor during compression was established.Taking the stages in centrifugal flue gas compressor of a 300 MW unit oxy-coal fired boiler as the example

the effects of rotation speed

inlet gas temperature and pressure on the stage performance parameters were investigated.The corresponding relationship between mass flow rate and the stage efficiency

flow loss

equivalent entropy head and pressure ratio was obtained

under different working conditions.The results show that

under stable working conditions

with an increase in the rotation speed

the stage flow loss decreased

the stage efficiency and pressure ratio increased and the stage performance curve became steeper.The inlet flue gas temperature affected more on the stage parameters comparing with the inlet pressure.It suggests that a cooler should be located in the middle of the compressor to control the inlet flue gas temperature thus to enhance the stage efficiency.