Purification of Oxyfuel-Derived CO_2 for Sequestration orEOR

摘要

Certain CO_2 capture processes, particularly Oxyfuel combustion in a pulverised fuel coal-fired power station, produce a raw CO_2 product containing contaminants such as water vapour, and oxygen, nitrogen and argon derived from the excess oxygen, impurities in the oxygen used, and any air leakage into the system. There are also acid gases present, such as SO_3, SO_2, HC1 and NOx produced as products of combustion. These acidic impurities will need to be removed from the CO_2 stream before it is introduced into the pipeline to prevent corrosion and comply with possible regulations. There may also be other stringent requirements on purity, particularly for applications such as enhanced oil recovery. In this paper we present an integrated process for CO_2 compression and simultaneous purification to produce CO_2 product streams at purities up to essentially pure CO_2.