Discussion
An economiser recovers heat from the flue gas into the
Answer: C
Correct answer: feedwater
An economiser sits in the flue and transfers heat from the leaving gas into the feedwater on its way to the drum, cutting the flue gas temperature and so the dry flue gas loss. Recovering the same heat into the combustion air instead is an air preheater - a different exchanger doing the analogous job on the other stream.
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