The GE-Texaco and Shell gasification technology based model of the IGCC power station was established by using the GT PRO software.The unsaturated water extracted from high pressure economizer of waste heat boiler was adopted to preheat the clean syngas

to investigate its influence on such performance as energy distribution

power generation capacity

electricity supply efficiency and net heat consumption rate of the IGCC power station.The simulation results showed that

after the clean syngas was preheated

the proportion of net generation of the GETexaco and Shell IGCC power station to the total input energy increased by 0.2%and 0.3%

respectively;the total input energy of the above two power stations decreased by 26 MW and25MW;the electricity supply efficiency of them rose by 0.26%and 0.36%

and the net heat consumption rate dropped by 51kJ/(kW·h)and 56kJ/(kW·h)

respectively.This indicates that preheating syngas can enhance the overall performance of IGCC power stations.