Oxy-fuel combustion carbon capture

Burning fuel with either pure oxygen or a combination of oxygen and recirculated flue gas in place of air is known as oxygen-fuel combustion.

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This method has the benefit of not heating up a lot of inert nitrogen in the atmosphere. Alternatively, a direct concentrated CO2 stream can be generated. A higher adiabatic flame temperature, which can improve fuel combustion efficiency, and the lack of NOx (nitrogen oxides) formation are two more benefits of oxy-fuel combustion. The fact that this method uses a lot of oxygen is a disadvantage.

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The production of oxygen through air separation units is an expensive and energy-intensive process. Flue gas ducting and major alterations to an existing boiler or heater are also necessary. As a way to lower carbon emissions, oxy-fuel combustion is currently gaining a lot of attention.