Modelling and analysis of the design constraints for integrated gasification combined cycle system

This thesis deals with a system study relating to the generation of clean power from coal. The main emphasis is on the modelling of an air-blown/oxygen-blown fluid bed gasifier with in bed desulfurization and IGCC (Integrated Gasification Combined Cycle Power Plant) system. A detailed evaluation of the design potential of an air-blown gasifier, hot gas cleanup and novel configurations of the IGCC system has been given.; We tried to achieve these goals by investigating the kinetic (both gasification and desulfurization), design, and operating constraints of the air blown gasifier and gas cleanup system, as well as of the combined cycle power plant. The results are compared with the IGCC power plants based on oxygen-blown entrained bed gasifiers.; A kinetic model for an air-blown/oxygen-blown fluidized bed gasifier with in bed desulfurization has been developed. It predicts the performances of several large pilot plants such as KRW and UGas with different coals very well.; Different design and performance constraints that impact on the IGCC plant thermal efficiency have been analyzed. Various configurations such as hybrid plants using a fluidized bed boiler and a gasifier are also considered. The results show that such systems have the potential to greatly enhance the thermal efficiency of coal fired power plants with low emissions.