4478Chemical EngineeringMedium
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?
A5
B40
C20
D60
Correct answer
C. 20
Explanation
The correct answer is 20.