Combined-cycle power generation technology of coal/air partial gasification uses the circulating fluidized bed(CFB) reactor as a gasifier and a combustion furnace. Coal is fed into the gasifier by the feed device and reacts with the air to produce gas which is then sent to the gas turbine for power generation. And the remaining semicoke is then fed to the circulating fluidized bed combustion furnace for combustion and power generation. This study uses Gansu Huating coal as design coal. And a simulation study on combined-cycle power generation technology of coal/air partial gasification is conducted by using Aspen Plus. The effects of air-coal ratio

carbon conversion rate on factors such as gasification temperature

gas composition

gas calorific value

gasification efficiency and power generation efficiency are studied. The results show that

when the air-coal ratio increases

gasification temperature increases and the gas calorific value

power generation efficiency and gasification efficiency decreases. Both the gasification efficiency and power generation efficiency increases when the carbon conversion rate increases. The system power generation efficiency increases with the increasing of the carbon conversion rate. However

the carbon conversion rate is greater than 80%

the increment of power generation efficiency is reduced dramatically. Therefore

it is appropriate to select the carbon conversion as 80%

and at this time the power generation efficiency is around 57%

which is much more than the efficiency of the existing pulverized coal-fired power generation plant.