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
Low calorific value of the fuel
Presence of large quantity of hydrogen in the fuel
High sulphur content in the fuel

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Fuels and Combustion
Combustion of pulverised fuel

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Requires larger combustion chamber than rich gaseous fuel
All of these
Suppresses the discharge of fine dust and grit into atmosphere

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