City Of Chicago Boiler Practice Exam

An economizer is used in large boiler plants to heat which part of the feedwater?

Feedwater Using Gases of Combustion Feedwater Using Steam Combustion Air Condensate Return Water

Correct Answer:

Feedwater Using Gases of Combustion

Explanation:

An economizer uses the heat in hot exhaust (combustion) gases to preheat the feedwater before it enters the boiler. This recovered heat boosts overall plant efficiency by reducing the energy the boiler must supply to turn water into steam, and it also lowers fuel consumption and thermal stress on the boiler. Heating feedwater with steam would require a separate steam-driven feedwater heater, not an economizer. Combustion air is heated in an air preheater, not in the economizer. The role of the economizer is specifically to transfer heat from the exhaust gases to the feedwater.

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