Comparative Analysis of Diesel and Liquefied Natural Gas (LNG) as Marine Fuels

Osisanya Olajuwon Wasiu; Ogugu Augustine Abiodun

doi:10.56201/ijemt.vol.12.no8.2026.pg129.148

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Comparative Analysis of Diesel and Liquefied Natural Gas (LNG) as Marine Fuels

Osisanya Olajuwon Wasiu, Ogugu Augustine Abiodun

Abstract

In support of the decarbonization goals of international shipping, this study compares the technical performance, economic viability, and environmental impacts of diesel- and liquefied natural gas -powered marine engines. A mixed-methods approach was adopted, combining quantitative modeling using MATLAB and Excel with qualitative analysis of seven expert interviews using NVivo. Data were obtained from technical manuals, academic literature, industry reports, and regulatory documents. Key performance indicators included thermal efficiency, specific fuel consumption , lifecycle emissions, retrofit cost, and payback period. Monte Carlo simulations (n = 10,000) were employed to address uncertainty in economic and environmental assessments. Results indicate that LNG engines outperform diesel engines in technical efficiency, achieving a thermal efficiency of 46.5% compared to 43.5% and a lower SFC of 165 g/kWh versus 185 g/kWh. Environmentally, LNG virtually eliminates sulfur oxides and particulate matter (PM) emissions while reducing carbon dioxide (CO2) emissions by approximately 22–25%, ensuring compliance with IMO 2020 sulfur regulations. However, methane slip (≈14 g/kWh) remains a significant challenge, potentially reducing LNG’s greenhouse gas advantage by up to 40% under high-slip conditions. Economically, LNG engines incur higher capital and retrofit costs (approximately US$11 million compared to US$7 million for diesel) but benefit from lower annual fuel and maintenance expenses. LNG payback periods range from 6–9 years, compared with 3–5 years for diesel. Sensitivity analysis shows that higher carbon taxes and wider fuel price differentials improve LNG competitiveness. Expert interviews further highlighted LNG’s role in regulatory compliance and sustainability while identifying methane regulation gaps and infrastructure limitations in developing countries. The study concludes that LNG is an effective transitional fuel toward net-zero shipping, provided methane slip and infrastructure challenges are addressed. The findings offer valuable insights for policymakers, investors, and shipowners navigating maritime decarbonization.

Keywords

Decarbonization; Diesel; Liquefied Natural Gas ; Marine Engines; Maritime Transport. IJEMT

References

Baldasso, E., Andreasen, J.G., Meroni, A., Haglind, F. (2017). Performance analysis of different organic Rankine cycle configurations on board liquefied natural gas-fuelled vessels, in: ECOS 2017: 30th Int. Conf. on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. San Diego, California. Deng, S.M., Jin, H.G., Cai, R.X., et al. Novel cogeneration power system with liquefied natural gas cryogenic exergy utilization. Energy 2004, 29(4): 497-512 DNV. Maritime Forecast to 2050. 2022. Goldmeer, J.; Buck, C.; Suleiman, B.; Selim, H.; Tayebi, K.; Agostinelli, G.-L.; Dawood, A. (2023)Techno-Economic Analysis of Hydrogen and Ammonia as Low Carbon Fuels for Power Generation. In Turbo Expo: Power for Land, Sea, and Air; American Society of Mechanical Engineers: New York, NY, USA. Idris MN (2003). ‘Modelling and Simulation of an Main Cryogenic Heat Exchanger of an existing Liquefied Natural Gas Process Unit’, An M.Tech Thesis submitted to the Rivers State University of Science and Technology Port Harcourt, Rivers State, Nigeria Idris MN, Abdu Z, Ahmed AS (2007). ‘Compressed Natural Gas development in Nigeria’s growing economy: A review’, Int. Pet. Technol. Training J., Jan 2007, vol. 4, No.1. ICCT, 2017. Transitioning to zero-emission heavy-duty freight vehicles. IPU, 2007. BS EN590 Standard for Diesel Fuel. Law, L.C.; Foscoli, B.; Mastorakos, E.; Evans, S. A. (2021). Comparison of Alternative Fuels for Shipping in Terms of Lifecycle Energy and Cost. Energies 2021, 14, 8502. Osorio-Tejada, J.L., Llera-Sastresa, E., Scarpellini, S., 2017. Liquefied natural gas: Could it be a reliable option for road freight transport in the EU? Renewable and Sustainable Energy Reviews 71, 785–795. https://doi.org/10.1016/j.rser.2016.12.104 Song, R. Cui, M., Liu, J. (2019). Single and multiple objective optimization of a natural gas liquefaction process, Energy 124: 19–28, https://doi.org/10.1016/j.energy. 2017.02.073 Total Petroleum Hydrocarbon Criteria Working Group: Volume 5. Human Health Risk Based Evaluation of Petroleum Release Sites: Implementing the Working Group Approach, June 1999. http://www.aehs.com/publications/catalog/contents/tph.htm Xing, H., Stuart, C., Spence, S., Chen, H.J.J. (2021). Alternative Fuel Options for Low Carbon Maritime Transportation: Pathways to 2050. J. Clean. Prod. 2021, 297, 126651

Comparative Analysis of Diesel and Liquefied Natural Gas (LNG) as Marine Fuels

Abstract

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