8 Opportunities for Integration of LNG with CCS

Key Findings:

  • CO2 emitted from LNG Acid Gas Removal Unit regeneration can be incorporated into CCS relatively easily and operational plants have done so for years
  • Capturing flue gas emission from gas turbine exhaust is more difficult. Post-combustion capture is favoured but CO2 concentration is low due to gas firing.

With the considerable infrastructure that is installed and planned for LNG, and with the CO2 emissions of the LNG Value Chain, various options for integrating CCS with LNG could be considered to achieve synergies between the goals of each industry. The relatively more straightforward integration is to capture the process and combustion CO2 emissions from the LNG value chain for sequestration. The relatively more difficult integration is the reuse of gas production facilities to form part of eventual CCS facilities.

For capture of the CO2 emissions of the LNG Value Chain, the two main sources to be considered are the Acid Gas Removal (AGRU) regeneration vent of CO2 to atmosphere and the gas turbine driver exhaust gas. The AGRU regeneration vent source is already the subject of CCS in projects that are implemented (Snøhvit, In Salah) or in development (Gorgon) and these are described below. The possible integration of combustion flue gas from LNG plants is discussed in Section 8.1.3 below.