The International Maritime Organisation (IMO) calls for the maritime industry to restrict its CO2 emissions by −40% (IMO2030) and −70% (IMO2050). This paper answered the following research question: “Which technical, economic and emissions-related conditions predominantly determine the feasibility of a conceptual supply chain of liquid CO2 that is captured from the exhaust gases of LNG powered offshore vessels?” The captured CO2 is transported to land where it is utilized by a final customer. The study followed a systems engineering approach. Problem definition was followed by a requirements analysis (technology, emissions, economy and operations), design with scenarios and a case study with realistic vessel deployment, modeling and evaluation. All designs have technical uncertainties and financial risks, but the sale of captured CO2 could be a crucial advantage of the proposed concept over other concepts. The main conclusion is that emission and financial targets (payback time) can be met by aligning the offshore transportation distance with the capacity to store CO2 on board and the available means of transport to the final user. Specialists from the vessel owner indicate that capturing, storage and off-loading is likely to have minor implications for the vessel availability and regular operations.@en

The International Maritime Organization has set clear objectives towards drastically reducing greenhouse gas emissions the coming decades in the maritime sector. While different ways to reduce emissions are already proposed, these are not expected to generate high CO₂ abatement rates (in the case of fuel saving measures) or to be available and cost competitive in the near future (in the case of alternative fuels). Alternatively, ship-based carbon capture (SBCC) technology could be implemented on the shorter term and has the potential to drastically reduce the CO₂ emissions of the maritime sector. This study discusses the advancements made towards the SBCC technology on board of LNG-fuelled ships using the results of the DerisCO2 project. The study covers general design considerations for the SBCC technology (solvent selection, heat integration and effect of ship movement), next to specific design considerations for the Sleipnir ship of Heerema Marine Contractors (analysis of operational profile, conceptual design and high level integration of the SBCC system), which is used as a case study for SBCC in this paper. Simulation of the SBCC technology including a techno-economic analysis on the case studies are included. The SBCC technology is a technically and economically viable solution for the maritime sector to reduce emissions the coming decades, with the cost of CO₂ capture for the Sleipnir calculated between 119-133 €/ton CO₂. The most important proposed next step for fast development of the SBCC system is on board demonstration of the technology.

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