Engineering · Steam — Boilers
An economizer improves boiler efficiency by:
- APreheating feedwater using heat from the exhaust (flue) gases✓ Correct
- BCooling the superheated steam
- CTreating the feedwater chemically
- DIncreasing the fuel oil temperature
Explanation
An economizer is a heat exchanger in the uptake that recovers heat from flue gas to preheat feedwater, reducing the fuel needed to raise it to boiling and improving overall efficiency.
Authority: Steam Plants (USCG engineering topic)
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