Engineering · Steam — Air Heater
A regenerative air heater on a boiler improves efficiency by:
- ASuperheating the steam leaving the drum
- BUsing exhaust flue gas to preheat the combustion air supplied to the burners✓ Correct
- CCooling the feedwater before the economizer
- DRemoving dissolved oxygen from the feedwater
Explanation
An air heater recovers heat from the flue gas (downstream of the economizer) to warm the incoming combustion air, which improves combustion and raises overall boiler efficiency.
Authority: Steam Plants (USCG engineering topic)
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