IGCC is an innovative electrical power generation technology that combines modern coal gasification with Gas turbine and Steam turbine power generation technologies. Gasification process has got paramount importance through the use of Integrated gasification combined cycle (IGCC). IGCC is a clean coal technology that has a potential for higher overall efficiency from low-grade coals and very low pollution levels. The approach to design a commercial size Pressurized Fluidized Bed Gasifier (PFBG) for IGCC is based on large-scale pilot plant experimentation and scale up of hydrodynamically similar cold model.