Furnace Technology
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.

5
20
60
40

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Furnace Technology
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Imperfect mixing of fuel & air and infiltration of air
Use of excessive positive draft in the furnace
Use of pulverised solid fuels
Use of non-preheated combustion air

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