Fuels and Combustion
'Fat coals' are those coals which have very high

Volatile matter content
Caking capacity
Inherent moisture content
Fusion point of its ash

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Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

There are chances of explosion during preheating
The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
It reduces its flame temperature tremendously
It reduces its calorific value tremendously

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