Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because

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it reduces its flame temperature tremendously

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there are chances of explosion during preheating

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it reduces its calorific value tremendously

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the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

1.	Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because
A.	there are chances of explosion during preheating
B.	it reduces its calorific value tremendously
C.	the hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
D.	it reduces its flame temperature tremendously
Answer» D. it reduces its flame temperature tremendously

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