Stoker Fired Boilers
Stokers are classified
according to the method of feeding fuel to the furnace and by the type
of grate. The main classifications are spreader stoker and chain-gate or
traveling-gate stoker.
Spreader Stokers
Spreader stokers utilize a
combination of suspension burning and grate burning. The coal is
continually fed into the furnace above a burning bed of coal. The coal
fines are burned in suspension; the larger particles fall to the grate,
where they are burned in a thin, fast-burning coal bed. This method of
firing provides good flexibility to meet load fluctuations, since
ignition is almost instantaneous when firing rate is increased. Due to
this, the spreader stoker is favored over other types of stokers in many
industrial applications.
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