Fuels and Combustion
Blast furnace gas compared to coke oven gas has

Lower ignition temperature
Higher calorific value
Narrower limit of inflammability
Lower theoretical flame temperature

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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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