Fuels and Combustion
'Mixed gas' used in steel plants is a mixture of

Coke oven gas and converter gas
Blast furnace gas and naphtha vapor
F. gas and coke oven gas
Coke oven gas and L.P.G

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

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

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