decreased steeply at the gas turbine (stream 11) due to the com- bustion reaction. During the reaction, CO and H2 were converted intoCO2 and H2O; therefore, the composition of CO2 increased. The hotexhaustgasfromtheturbinepassedtheHRSG,resultinginheat transfertotheBFWfortheproductionofsteam.HP,IPandLPsteam usedforthesteamturbinesweregeneratedfromthesyngascoolers and HRSG by recovering the heat from a gasifier and gas turbine exhaust gases. Moreover,syngascoolerand HRSGweremodeled to calculate the quantity of the generated steam and the amount of heat recovered by utilizing the heat exchanger module in PRO/II simulator. This is furtherance, with the assumption that the approaching temperature for Economizer is 4 C and that for Super heater is 25 C. After the heat transfer,the exhaust gas wasemitted to the atmosphere, as illustrated by stream 13 in Fig. 4.