Discussion
Excess air above the optimum raises the flue gas loss because it
Answer: D
Correct answer: adds mass that is heated and then discarded
Every kilogram of excess air is drawn in cold, heated to flue gas temperature by the fuel, and then thrown up the stack still hot. It contributes nothing to combustion and carries away energy in proportion to its mass, which is why trimming the excess air to the least that still burns the fuel cleanly is the first move in any boiler audit.
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