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.