The function of an economiser in a boiler is to preheat the _____________________?
Correct answer: B. Feedwater
- A. Combustion air
- B. Feedwater
- C. Pulverised coal
- D. Furnace oil
Explanation
An economiser recovers heat from boiler flue gas to raise the temperature of the incoming feedwater before it enters the boiler. It does not preheat the combustion air, which is the air-preheater's function.
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