The working principle of an FBC Type of Hot Air Generator centers around the fluidized bed combustion process. The generator consists of a combustion chamber with a bed of solid particles. When air is blown through this bed, the particles are suspended, resembling a boiling fluid. Fuel, such as coal or biomass, is introduced into this fluidized bed, where it ignites and burns rapidly. The heat generated from the combustion is transferred to the air circulating through the bed, producing hot air.