The captured CO2 is compressed and transported and then injected into geologic formations.
CO2 transportation via pipelines is commercially well established. For instance, in the table below are listed the main existing CO2 onshore pipelines in US used for EOR (Enhanced Oil Recovery) operations, with their capacities, diameters and elevation.
CO2 is typically transported in a dense phase (supercritical phase), at a temperature between 4-38°C and a pressure ranging between 86-147 bar; typically, CO2 velocity is of ca. 1.4 m/s, in order:
CO2 purity is another critical issue: the presence of impurities can affect CO2 properties, reducing density and viscosity and increasing vapour pressure. Consequently, a particular attention is paid to CO2 purity for transport reasons.
The main components of a pipeline are represented by: