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

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

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Fuels and Combustion
Froth floatation is used for

Removing ash from the coal based on difference in specific gravity of coal and ash
All of these
Washing fine coal dust (< 0.5 mm size)
Washing lump coal (> 80 mm size)

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