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Post‐combustion refers to the group of technologies able to separate CO₂ from the flue gas emitted during the fuel combustion and/or other reactions in the industrial sector. This indicates that those systems are mainly installed as additional equipment downstream in new plants or during the retrofitting of the existing facilities. The latter represents the main advantage of post‐combustion technologies compared to pre‐ or oxy‐combustion, as a fundamental redesign or complex integration with the existing facilities would be minimal.

Figure 1.2 Process schematic of a simplified commercial scale natural gas Allam cycle.

Source: Adapted from Allam et al. [4].