To reduce the stack loss, heat recovery from flue gas can be done by_____________________?
Correct answer: D. All A., B. and C.
- A. Preheating of cold stock
- B. Preheating of combustion air
- C. Steam generation in waste heat boilers
- D. All A., B. and C.
Explanation
Flue-gas heat can be recovered by heating the stock, preheating combustion air, or producing steam in a waste-heat boiler. Each method transfers otherwise lost sensible heat to a useful process.
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