Atmospheric Fluidized Bed Combustion (AFBC) Boiler
Most operational boiler
of this type is of the Atmospheric Fluidized Bed Combustion. (AFBC).
This involves little more than adding a fluidized bed combustor to a
conventional shell boiler. Such systems have similarly being installed
in conjunction with conventional water tube boiler.
Coal is crushed to a size
of 1 – 10 mm depending on the rank of coal, type of fuel fed to the
combustion chamber. The atmospheric air, which acts as both the
fluidization and combustion air, is delivered at a pressure, after being
preheated by the exhaust fuel gases. The in-bed tubes carrying water
generally act as the evaporator. The gaseous products of combustion pass
over the super heater sections of the boiler flow past the economizer,
the dust collectors and the air preheater before being exhausted to
atmosphere.
