Fuels and Combustion
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Lack of thorough mixing of fuel with air
Presence of large quantity of hydrogen in the fuel
High sulphur content in the fuel
Low calorific value of the fuel

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

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

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Fuels and Combustion
With increase in the temperature of carbonisation of coal

Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content
Methane content in the coke oven gas decreases and carbon monoxide content increases
Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
All of these

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