ABSTRACT

Fluidized bed combustion (FBC) is burning of various solid fuels in the fl uidized state-a condition where a gas-solid mixture behaves like a free-fl owing fl uid.

Mass burning (MB) and traveling grate (TG) stokers burn solid fuel in static mode with the fuel resting on a grate, whereas pulverized fuel (PF) fi ring burns the fuel in suspension mode in transport condition. Between the two extremes of static and transport modes lies the fl uidized mode. With the right proportioning of air pressure and the proper sizing of fuel, the air-solid mixture behaves like a fl uid. The fl uid bed experiences progressively more turbulence, as air velocity is increased. FBC is the combustion in this state-bubbling FBC (BFBC) at the lower end and circulating FBC (CFBC) at the higher end.