Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?
Correct answer: C. 20
- A. 5
- B. 60
- C. 20
- D. 40
Explanation
Preheating combustion air to 400°C recovers a substantial part of the flue-gas sensible heat, reducing the furnace-oil requirement by approximately 20% under the stated high flue-gas temperature condition. The saving is therefore much greater than the 5% estimate but not as high as 40% or 60%.
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