When the HIGH velocity gas is passed through a packed BED of finely divided SOLID particles, the particles become suspended in the gas stream and the packed bed becomes a fluidized bed. When the gas velocity is very high, the fluidized bed become turbulent and rapid mixing of particles OCCURS. Ultimately, the, behaviour of mixture solid particles and gas become a fluid. Burning of a FUEL in such a state is known as Fluidized Bed Combustion. The boiler plant using this fluidized bed combustion is known as fluidized bed boilers.

When the high velocity gas is passed through a packed bed of finely divided solid particles, the particles become suspended in the gas stream and the packed bed becomes a fluidized bed. When the gas velocity is very high, the fluidized bed become turbulent and rapid mixing of particles occurs. Ultimately, the, behaviour of mixture solid particles and gas become a fluid. Burning of a fuel in such a state is known as Fluidized Bed Combustion. The boiler plant using this fluidized bed combustion is known as fluidized bed boilers.