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Boiler heat-recovery devices: location of the air preheater Identify where an air preheater is typically installed in the boiler flue-gas path relative to the economiser and chimney. Choose the correct location.

Difficulty: Easy

Correct Answer: Between the economiser and the chimney

Explanation:


Typical arrangement

  • Superheater → Economiser → Air preheater → Chimney (gas progressively cools).


Reason

Air preheaters recover the lowest grade of heat (lowest gas temperatures) to preheat combustion air before it enters the furnace, so they are usually placed just before the chimney, downstream of the economiser.


Final Answer
Between the economiser and the chimney.

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