Fuels and Combustion
In low temperature carbonisation of coal, the

Yield of coke oven gas is 290 Nm³ /ton dry coal
Volatile matter in coke is zero
Temperature maintained is 700°C
Yield of tar is about 3% of dry coal

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Fuels and Combustion
A carbonaceous fuel (containing no H₂ or hydrocarbons) is burnt and the resulting flue gas contains 21% CO₂. It means that

21% excess oxygen has been used for combustion
21% excess air has been used for combustion
No excess air has been used for combustion
Complete combustion of fuel has taken place

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