In the oxy-fuel process, coal is combusted in an atmosphere consisting of pure oxygen and carbon dioxide (CO₂). This purer mixture burns at a higher temperature than natural air, and so utilisation of the oxyfuel process results in more efficient burning.
Additionally, the resultant flue gas is not diluted by nitrogen from the air, but primarily consists of CO₂ and water vapour.
This vapour is easily condensable, leaving a highly concentrated CO₂ stream. The CO₂ can then be compressed and transferred for storage.
For this process, Linde provides the air separation unit for the production of oxygen, the CO₂ compression, drying and purification system as well as an optional liquefaction system.