Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the

Excessive power requirement of air blower
Intermittant and uncontrolled combustion of the fuel
Enhanced sensible heat loss in the flue gas
High exit flue gas temperature from the furnace

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Fuels and Combustion
Coke oven gas is a better fuel than blast furnace gas, because of its higher

All of these
Adiabatic flame temperature
Heat release rate (thus requiring smaller combustion chamber)
Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)

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