Typical fossil fuel combustion flue gas characteristics

CO2 capture from flue gas is known as post-combustion capture. It is important to know the physical and chemical properties of flue gas.

Typical fossil fuel combustion flue gas characteristics

Parameter Typical range of values
Pressure At or slightly above atmospheric pressure
Temperature 30 – 80 or higher, depending on the degree of heat recovery
CO2 Coal-fired, 14 %Natural gas-fired, 4%
O2 Coal-fired, 5 %Natural gas-fired, 15%
N2 ~ 81 %
SOx Coal-fired, 500 – 5000 ppmNatural gas-fired, <1 ppm
NOx Coal-fired, 100 – 1000 ppmNatural gas-fired, 100 – 500 ppm
Particulates Coal-fired, 1000 – 10,000 mg per m3Natural gas-fired, 10 mg per m3

Carbon monoxide (CO) is not shown in the table but may also be present in the case of incomplete combustion as a result of a lack of oxygen in the combustion chamber.


Stephen A. Rackley. Carbon Capture and Storage. 2010. Elsevier Inc.


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