Furnace oil consumption in a furnace for a given duty employing preheated combin

Question

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.

Options:

A . 5

B . 10

C . 20

D . 35

Answer: Option C

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