Fuels and Combustion
In high temperature carbonisation of coal compared to low temperature carbonisation

Calorific value of the coke oven gas is lower
Yield of ammonia is less
H₂ content in the coke oven gas is more
Aromatic content of tar is low

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

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

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