On the basis of the typical feed water systems in heat recovery steam generators(HRSG)on 9F class gas-turbine combined units manufactured by SMS

GE and MHI GT

relative comparisons were carried out

from such aspects as feed water oxygen content adaptability

system complexity degree

system operation safety and economy.It suggests that the deaerating condenser or condenser equipped with bypass deaerating system should be adopted at the unit side

to ensure the oxygen content in HRSG feedwater satisfy the requirements under any conditions.A feed water system that is more suitable for unit under full condensing condition was selected.Furthermore

combined with the special requirements of heating supply unit on feed water system

the current feed water systems of heat supply units were analyzed and the optimized feed water system was proposed.