Which component recovers heat from flue gases to preheat feedwater?

Prepare for the Engineman EN A School Test 1. Utilize flashcards and multiple choice questions with detailed explanations to boost confidence and readiness for the test.

Multiple Choice

Which component recovers heat from flue gases to preheat feedwater?

The idea being tested is heat recovery from the boiler’s exhaust to boost feedwater temperature. In many steam plants, an economizer is the device that sits in the path of the hot flue gases and transfers their remaining heat to the incoming feedwater. As feedwater flows through the economizer, it picks up heat from the flue gases, so the water entering the boiler is warmer. This reduces the energy the boiler must expend to convert water into steam and lowers fuel use, improving overall efficiency. Among the options, the function described is not directly performed by a combustion air heater, cooling water loop, flue gases themselves, or condensate in isolation. The essential concept is that a heat exchanger (the economizer) uses heat from the flue gases to preheat feedwater.

The idea being tested is heat recovery from the boiler’s exhaust to boost feedwater temperature. In many steam plants, an economizer is the device that sits in the path of the hot flue gases and transfers their remaining heat to the incoming feedwater. As feedwater flows through the economizer, it picks up heat from the flue gases, so the water entering the boiler is warmer. This reduces the energy the boiler must expend to convert water into steam and lowers fuel use, improving overall efficiency.

Among the options, the function described is not directly performed by a combustion air heater, cooling water loop, flue gases themselves, or condensate in isolation. The essential concept is that a heat exchanger (the economizer) uses heat from the flue gases to preheat feedwater.

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