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

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

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Fuels and Combustion
Anthracite coal

Is essentially a coking coal
Burns with short, bluish, yellow-tipped flame producing very little smoke
Ignites more easily than bituminous coal
Contains more volatile matter than bituminous coal

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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

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

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