Fuels and Combustion
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

CO₂, O₂, CO
CO, O₂, CO₂
O₂, CO₂, CO
CO₂, CO, O₂

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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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