Low Molecular Weight Gas Behaviour in Multiphase CO2 Transport

This study investigates the behaviour of nonpolar low molecular weight gas impurities in CO2 transport systems. The focus is on offshore carbon capture and storage (CCS) applications, where CO2 is captured and gathered onshore, with high pressure offshore CO2 export and subsea injection.

Carbon capture technologies always leave some impurities in the CO2 stream. A typical specification is for minimum CO2 content to be 95% to 98%. Low molecular weight gases are important in this environment as they can become concentrated on breakout, which has implications from a technical safety, material selection, and operability perspective.

This Pace Flow Assurance study offers a comprehensive review of the thermodynamics and flowing behaviour of low molecular weight impurities in CCS transport networks.

Publication/paper forthcoming.

Client: National Grid Corporation