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Fuels - Combustion Air and Flue Gases

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Combustion air and flue gas for some common fuel gases, solids and fluids:

For full table with Theoretical Flue Gas - rotate the screen!

Fuels - Combustion Air
FuelTheoretical air for combustion2)Theoretical flue gas2)
Solids (m3/kg) (ft3/lb) (m3/kg) (ft3/lb)
Anthracite 9.4 150 9.5 152
Bituminous coal 6.9 110 7 112
Charcoal 8.4 134 8.4 135
Coke 8.4 134 8 135
Lignite 5.7 92 8.4 93
Peat 5.7 92 5.9 94
Semi anthracite 8.4 135 8.6 137
Wood (dry) 4.4 70 5 80
Gas (m3air/m3fuel) (ft3air/ft3fuel) (m3gas/m3fuel) 1)
(ft3gas/ft3fuel) 1)
Butane C4H10 31 31 33.4 33.4
Natural gas 9.5 9.5 10.5 10.5
Propane C3H8 23.8 23.8 25.8 25.8
Fluids (m3air/literfuel) (ft3air/galfuel) (m3air/literfuel) (ft3air/galfuel)
Gas oil


1570 10.4 1670
Heavy fuel oil 10.8 1730 11.6 1860

1) Combustion of a fuel gas creates a flue gas with higher density than the fuel gas and the combustion air. Check stoichiometric combustion.

2) Volume at standard pressure

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