Container ships could reduce emissions with just-in-time arrivals

Posted on June 7, 2022 at 6:05 p.m. by

The Maritime Executive

Shipping lines have increasingly realized the benefits of optimizing voyages for fuel savings and cost control, but a new report from an IMO-sponsored low-carbon public-private partnership highlights highlight the immediate benefits of reducing carbon emissions through what they call “Just in Time”. Arrivals.” Focusing on even a relatively small number of voyages, they point out that the shipping industry could see immediate results in reducing carbon emissions while work continues on future technologies and fuels. alternatives.

Just-in-time arrivals allow vessels to optimize their speed during their journey to arrive in port when mooring, channel and nautical services are available. This represents a shift in mindset for the industry where many experts point out that captains are judged on their ability to arrive on time, often requiring them to go fast to ensure an on-time or early arrival. However, as fuel costs have risen, shipping lines have increasingly adopted voyage optimization programs, and even ports, such as those on the U.S. Pacific Coast, have asked container ships to optimize their voyages in order to reduce the backlog of ships waiting offshore and the resulting emissions. .

“In the fight against climate change, global maritime transport has a steep mountain to climb, and we must pull all the levers to respect the Paris Agreement,” said Captain Andreas M. van der Wurff, head of the port optimization at AP Moller-Maersk and chairman of the Low Carbon GIA Ship-Port Interface working group which sponsored the research. “The study highlights that, as we work to accelerate and expand the availability of future green fuels, significant near-term emission reductions can be achieved by bringing together ships, terminals and ports to exchange standardized data and Just facilitate In time arrivals.

The research points out that container ships can reduce fuel consumption and resulting carbon dioxide emissions by up to 14% per trip using JIT arrival. The results show that while optimizing speed over the entire duration of a voyage offers the greatest opportunity for savings, there are also benefits (5.9%) if a vessel optimizes speed over a period of 24 hours or even benefits (4.2%) produced over a 12 hour period. – hour period. “This indicates that implementing JIT in the last 12 hours of a trip can already contribute significantly to fuel and emissions savings,” the report concludes.

The analysis also shows that 50% of the potential fuel savings could be achieved by focusing on a relatively small subset of trips (8.5% for total trips, 6.5% for the last 24 hours and 3 .2% for the last 12 hours). According to the authors of the research, these trips are “potential candidates for first-mover”, as part of the approach offering industry the opportunity to create immediate emission reductions.

“The results of this study demonstrate that operational changes to industry practices, to effectively implement JIT, can result in significant fuel consumption and therefore CO2 emissions savings,” the report concludes.

The research was conducted by MarineTraffic and Energy and Environmental Research Associates using AIS data comprising 339,390 container ship voyages in 2019. They calculated that the ships consumed 43.97 million metric tons of fuel and they tested the application of optimization techniques to these trips. The scenarios focused on fully optimizing the trip from pilot station to pilot station, as well as using just-in-time arrival for the last 24 or 12 hours of the trip before reaching the piloting. Fuel savings ranged between 1.8 million and 6.2 million metric tons while resulting CO2 emission reductions ranged from 5.8 million to 19.4 million metric tons.

They conclude that the study demonstrates the potential for significant cost savings through the implementation of optimization strategies. However, to achieve these savings, they note that collaboration between shipping lines, ports and terminals will be required to optimize voyages and properly implement JIT arrivals.

While saying it is clear that the sooner a vessel can act to optimize speed, the greater the potential savings in fuel consumption, they also call for further research to support implementation of the approach. They also recommend further study of the portion of travel targeting the small percentage of travel with the potential for the greatest emissions reductions.

The complete survey is available online from IMO.

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