Integration of Post-Combustion Capture and Reinjection Plant to Power Generation Cycle Using CO₂-Rich Natural Gas in Offshore Oil and Gas Installation

Abstract:

The use of CO₂-rich natural gas (%CO₂ ≈ 20%mol) for power generation in offshore hubs results in simpler upgrade process, while imposes an extra challenge to mitigate emissions. Power generation via combined cycle configurations and post-combustion capture with CO₂ reinjection are investigated for carbon-footprint reduction, while increasing gas export and oil production, respectively. The processes are simulated using Aspen HYSYS software and compared to currently installed simple cycle configuration in terms of footprint, weight, power, efficiency and CO₂ emissions. The combined cycle including two gas turbines and one single-pressure steam cycle (CC 2:1:1) results in the most favorable power system, having 53% efficiency, 476.8 gCO₂/kWh emissions and similar dimensions compared to the simple cycle. The integration of a post-combustion capture sending the CO₂ for enhanced oil recovery results in 241 gCO₂/kWh for the CC 2:1:1 and 251 gCO₂/kWh for the simple cycle, without great impacts in total efficiency. The CC 2:1:1 with post-combustion capture presents higher net efficiency, lower dimensions and greater economic advantages, enabling emissions reduction without having significant impacts on the power generation.

• Periodical: Materials Science Forum (Volume 965)
• Pages: 49-58
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.965.49
• Online since: July 2019
• Authors: Raquel de Pádua Fernandes Silva*, José Luiz de Medeiros, Ofélia de Queiroz Fernandes Araújo
• Keywords: CO₂-Rich Natural Gas, Enhanced Oil Recovery, Offshore Power Generation, Post-Combustion Capture

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