Towards Sustainable Shipping: Climate change and other environmental perspectives on carbon-based marine electrofuels and onboard carbon capture
Doctoral thesis, 2023
A mixed methods approach to environmental assessment is used, combining thematic analysis, literature reviews, and life cycle assessment. Through case study applications, the environmental performance of electromethanol, electromethane, and onboard carbon capture are investigated when applied in the maritime sector in northern Europe. Thematic analysis is used to investigate what is hindering low-emission fuels from being further utilized in maritime cargo transportation.
The results show that if renewable energy is used in fuel production and CO2 is captured from a source not acting as a driver of fossil fuel extraction, climate change impact can be reduced by using carbon-based electrofuels instead of fossil fuel options. Potential trade-offs were identified as carbon-based electrofuels can lead to higher pressure on human health impacts than today’s conventional fuels. The extent of the trade-offs is uncertain and affected by limitations in the methodological approach. Suggestions on how to address these uncertainties are introduced and analyzed. Assessment of future scenarios for large-scale marine electromethane production in Sweden reveals that combined biofuel and electrofuel production likely results in the lowest environmental impacts. Onboard carbon capture can lower the climate change impact if combined with electrofuel production or carbon capture and storage. The environmental impacts at large depend on the bunkered fuel and the choice of carbon capture technology.
The results underscore the importance of integrating life cycle assessment with other scientific methodologies. The environmental impacts of capital goods should be included in life cycle assessments of future marine fuels, and scenario-based assessments are preferable over single-vessel evaluations.
liquefied natural gas
power-to-X
methanol
power-to-gas
carbon capture and utilization
thematic analysis
Marine renewable energy
onboard carbon capture
marine fuels
LCA
shipping
electrofuels
Author
Elin Malmgren
Chalmers, Mechanics and Maritime Sciences (M2), Maritime Studies
Review of electrofuel feasibility - Cost and environmental impact
Progress in Energy,;Vol. 4(2022)
Journal article
The environmental performance of a fossil-free ship propulsion system with onboard carbon capture - a life cycle assessment of the HyMethShip concept
Sustainable Energy and Fuels,;Vol. 5(2021)p. 2753-2770
Journal article
Navigating unchartered waters: Overcoming barriers to low-emission fuels in Swedish maritime cargo transport
Energy Research and Social Science,;Vol. 106(2023)
Journal article
Malmgren, E., Brynolf, A., Hjort, A., Jivén, K. Assessing the environmental performance of liquified methane propulsion: Renewable methane production and its implications for the European shipping fleets’ environmental footprint
Driving Forces
Sustainable development
Areas of Advance
Energy
Subject Categories
Other Environmental Engineering
Energy Systems
Environmental Sciences
ISBN
978-91-7905-949-1
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 5415
Publisher
Chalmers
Alfa, Sagahuset, Hörselgången 4, Göteborg
Opponent: Professor Tristan Smith, University College London Energy Institute, London, United Kingdom