Pressurized Fluidized Bed Combustion Boiler is equipped with a compressor that supplies the forced draft air and the combustor is a pressure vessel. The Fluidized Bed Combustion Boiler is operated at an elevated pressure and produces high-pressure gas stream at temperatures that can drive a gas turbine. The Fluidized Bed Combustion Boiler can be used for cogeneration or combined cycle power generation. Pressurized Fluidized Bed Combustion Boiler finds extensive application in various industrial sectors.