Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300°) may be reduced by about ______________ percent as compared to the use of atmospheric combustion air?
Correct answer: C. 20
- A. 5
- B. 10
- C. 20
- D. 35
Explanation
Preheating combustion air supplies part of the required heat before combustion, reducing the furnace fuel demand for the same duty. At about 300°C air preheat, the usual estimated saving is approximately 20%.
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