Different types of power generating system with integrated coal gasification combined cycle (ICGCC) have been presented. The concept design of ICGCC system of using air for gasification has been carried out

four types of ICGCC power generating system with air for gasification being calculated and analysed. The results of study show that (1) the coalfired ICGCC pwer generating system to have comparatively large comprehensive superiority; (2)under same designed parameters

the ICGCC system with fluidized bed gasifier of lower temperature and that with air flow bed gasifier of higher temperature each has its strong and weak points

it is recommended to use fluidized bed gasifier for ICGCC system allocated with low temperature rough coal gas purification system; (3)during the process of of designing ICGCC system

the inlet temperature of gas turbine should chose a high value as possible. there is an optimal pressure ratio value corresponding to the said temperature; (4) the power supply efficiency of ICGCC system to be 5~7 percentage point higher than that of a conventional power plant.