Chain-grate or Traveling-grate Stoker
Coal is fed onto one end
of a moving steel grate. As grate moves along the length of the furnace,
the coal burns before dropping off at the end as ash. Some degree of
skill is required, particularly when setting up the grate, air dampers
and baffles, to ensure clean combustion leaving the minimum of unburnt carbon in the ash.
The coal-feed hopper runs
along the entire coal-feed end of the furnace. A coal gate is used to
control the rate at which coal is fed into the furnace by controlling
the thickness of the fuel bed. Coal must be uniform in size as large
lumps will not burn out completely by the time they reach the end of the
grate.
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