Recent developments in propulsion technologies and bunkering infrastructure suggest that ammonia could be included in the commercial bunker fuel mix before the decade is over.

Japanese shipbuilder Mitsui Engineering & Shipbuilding (Mitsui E&S) has started prototype testing of German engine maker MAN Energy Solutions’ (MAN ES) two-stroke ammonia dual-fuel engine at its Tamano Factory in Japan. Theoretically, prototype testing bridges the gap between concept and real-world application and shows whether an engine is commercially viable before large-scale deployment.

MAN ES and Mitsui E&S have not yet specified a timeline for project completion, but successful prototype testing could suggest that commercial deployment may be expected soon.

Swiss engine-maker Winterthur Gas & Diesel (WinGD) also confirmed that it will launch its ammonia dual-fuel engine by June 2025, while Finland’s Wärtsilä already introduced its ammonia dual-fuel internal combustion engine (ICE) last year.

WinGD has already secured 30 orders for its ammonia-capable engines across bulk carriers, container ships, tankers and LPG/ammonia carriers. Interestingly, classification society DNV reports that 30 ammonia-capable newbuilds are currently on order for delivery towards 2027, but it remains unclear whether all of them will be equipped with WinGD’s engines.

While ammonia ICEs mark a significant step toward its potential adoption as a commercial marine fuel, they come with one caveat – the need for pilot fuel, typically diesel, to ignite ammonia due to its high auto-ignition temperature. Diesel pilot introduces a carbon footprint, which undermines green ammonia’s zero-emission potential.

To address this issue, South Korea’s Hanwha Ocean is developing an ammonia gas turbine that could eliminate the need for pilot fuel altogether. The company aims to debut an ammonia gas turbine-powered LNG carrier by 2028, potentially opening the door to 100% ammonia-based propulsion.

Bunkering infrastructure is also a critical factor in enabling ammonia’s commercial adoption.

South Korea has committed $410 million to establish LNG, methanol and ammonia storage facilities at its major ports by 2030. In addition, the country has allocated $270 million to construct four bunkering-only vessels, designed specifically for LNG and ammonia refueling.

Bunker supplier China Shipping & Sinopec successfully bunkered an ammonia-powered tugboat at the COSCO Shipping Heavy Industry dockyard in China, demonstrating that safe and efficient ammonia bunkering can be carried out with the right infrastructure and handling procedures.

“The successful bunkering has effectively tested the integrity and efficiency of the company’s bunkering equipment system, gathered valuable knowledge and experience for the deployment of ammonia fuel in large vessels,” COSCO Shipping said.

Meanwhile, Norwegian ammonia producer Yara Clean Ammonia has signed the world’s first time-charter agreement for an ammonia-capable medium gas carrier with Japanese firm NYK. The vessel is set for delivery this November.

Despite these advancements, ammonia’s high toxicity presents significant safety challenges during bunkering operations and storage. Stringent safety protocols must be followed to mitigate the risk of exposure, especially given ammonia’s potential hazards to human health.

Ammonia bunkering and transfer pilots can help identify the key steps involved in safe fuel handling, Lynn Loo, chief executive of the Global Centre for Maritime Decarbonisation (GCMD), told ENGINE. Both operations require specialised equipment, robust containment measures, and strict handling procedures to minimise the risk of ammonia leaks during fuel transfers between vessels.

In other news this week, Swedish e-fuel company Liquid Wind plans to develop another 100,000 mt/year e-methanol production plant in Sweden. Liquid Wind has partnered with Swedish power utility company Övik Energi to set up renewable electricity input to power e-methanol and green hydrogen production.

South Korean shipping firm H-Line Shipping has placed an order with shipbuilding company HJ Shipbuilding & Construction (HJSC) for an LNG dual-fuel bunkering vessel. The 18,000-cbm capacity vessel will feature a dual-fuel propulsion system, allowing it to run on both LNG and conventional fuel oil. 

Danish pump manufacturer Svanehøj will supply deepwell CO2 cargo pumps for both the onshore storage facility and the first liquefied CO2 carrier in the UK-based energy company INEOS Energy-led Project Greensand. The deepwell CO2 cargo pumps for both the LCO2 carrier and the onshore facility at Port Esbjerg are set for delivery in the third quarter of 2025.

Related: South Korea’s HJSC scores LNG bunkering vessel order from H-Line Shipping

Photo credit: Yara
Source: ENGINE
Published: 17 February, 2025