Carbon Capture and Storage (CCS) is a key technology to mitigate emissions from large-scale fossil fuel use. CCS primarily involves capturing the CO2 arising from energy-related and industrial sources, treating of the CO2 to remove impurities, and injecting it in a storage site to ensure long-term isolation from the atmosphere. The specific difference in relation to experience with relatively pure CO2 injection is caused by the impurity of the CCS CO2 which will be dictated by the CO2 source and capture technology employed.
The aim of this work is to identify an approach to materials selection and corrosion control that can address the specific requirements of a CCS project. Depending on the phase envelope and CO2 composition, separate liquid phases may be formed. It has been identified that these phases can comprise of water (causing CO2 corrosion) or reaction products including strong acids and elemental sulphur.
The type of liquids formed and shifts in the phase envelope can significantly influence materials integrity due to corrosion, and impact on the toughness and degradation of polymers.
In this paper guidance is provided with a process to select materials and ensure corrosion control. It is recommended to start each project with the identification of the CO2 specification and operating scenarios, including upsets that might occur during the service life. Input is provided that can be used for a Failure Mode and Effect Analysis (FMEA) specific to CO2 transport and injection.
The aim of this work is to identify an approach to materials selection and corrosion control that can address the specific requirements of a Carbon Capture and Storage (CCS) project. This work is largely based on the accumulated knowledge and expertise that has been published[1,2]. Besides the direct guidance from this document, specific topics may require more detail that can be found in the references.