(A) supply of excess, air
(B) supply of excess coal
(C) burning CO and unburnts in upper zone of furnace by supplying more air
(D) fuel bed firing
(E) none of the above
(A) supply of excess, air
(B) supply of excess coal
(C) burning CO and unburnts in upper zone of furnace by supplying more air
(D) fuel bed firing
(E) none of the above
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