Dama, TesfayeDesta, Melaku2018-07-062023-11-182018-07-062023-11-182011-11http://etd.aau.edu.et/handle/12345678/6769An attractive and practicable possibility of biomass utilization for energy production is gasification integrated with a combined cycle. This technology seems to have the possibility to reach high efficiencies based on a fundamentally clean and renewable fuel. Biomass Integrated Gasification Combined Cycle (BIGCC) systems replace the traditional combustor with a gasifier and gas turbine. Exhaust heat from the gas turbine is used to produce steam for a conventional steam turbine. The gas and steam turbines operate together as a combined cycle. This paper investigates the ultimate potential for application of Biomass Integrated Gasification Combined Cycle (BIGCC) to biomass based power systems. It describes the elements of the gasification system and the methods to model the components of BIGCC system thermodynamically. A computer program using MATLAB is used to estimate the syngas composition of the gasification system using a down draft gasifier and wood as input. It predicts the effects of moisture content, temperature, pressure, and air to fuel ratio on syngas composition. This study also includes the economic importance of Biomass Integrated Gasification Combined Cycle (BIGCC) system over conventional bio-fuelled power plantsenThermal Engineering streamThesis