Q.

What is the function Air heater in the boiler?

A. preheat the air before entering the boiler
B. recover the heat from flue gas
C. heating of economizer tubes
D. reheat the gas coming out of economizer
Answer» B. recover the heat from flue gas
Explanation: function of air preheater is to recover the heat of a portion of exhaust flue gases before the flue gases enter the chimney. it is places along the passage of the exhaust flue gases in between the economizer and the chimney.
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