Advancing ammonia engine innovation
The Everellence B&W ammonia two-stroke engine builds on the proven ME-LGI concept and the development is currently well underway at our Research Centre Copenhagen. Designed as a newbuild engine, which will become available as retrofit solution for electronically controlled ME-C engines, this ammonia-fuelled marine engine is engineered to enable low-emission operation for tomorrow’s fleet.
Our engineering teams are incorporating essential safety features such as ammonia containment systems, sensors, system ventilation and double-walled piping. In July 2023, the first ammonia combustion was successfully achieved on our research engine, with highly stable performance data.
Full-scale engine testing began in November 2024 and focuses on combustion behavior, emissions, engine tuning, atomizer validation and control system verification. The testing phase is scheduled to continue through mid-2025.
Powering the future with zero-carbon fuel
Everllence B&W ME-LGIA development
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Key benefits of ammonia engines
Ammonia-powered engines offer a compelling combination of efficiency, sustainability, and flexibility – making them a future-proof choice for clean marine propulsion.
- High energy efficiency with low emissions
Ammonia can be used as an energy carrier of sustainable hydrogen and is carbon free. The two-stroke ammonia engine is designed to run with as little as 5% pilot oil at 100% load (L1 rating*), with the remaining 95% of energy coming from ammonia. This results in high power output, excellent engine efficiency, and extremely low emissions - making it a future-proof solution for clean propulsion.
* Performance values indicated refer to energy fraction for L1 rated engines operating at 100% load point in Tier II mode. Actual values may vary depending on engine rating and load conditions. - Carbon- and sulphur-free combustion
Ammonia produces no carbon or sulphur emissions, enabling clean and sustainable combustion. Green ammonia is especially promising as a marine fuel due to its potential for lower production costs compared to other e-fuels such as e-methanol and synthetic natural gas. This positions the ammonia-fuelled engine as a strong candidate for large-scale decarbonization in shipping. - Flexible retrofit options
Ammonia-fuelled engines can be adapted to customer needs – either as newbuilds or as modular, dual-fuel retrofit solutions for existing electronically controlled engines. Whether you operate a modern fleet or look to decarbonize existing vessels, our experts can help you implement the most suitable ammonia engine configuration for your operation.
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The Everllence B&W ammonia engine design philosophy
Ammonia mode
The target of 5% specific pilot oil consumption at 100% load for L1-rated engines has been reached*.
There is potential for further reductions, but additional four-cylinder testing will showcase the full potential. The initial ME-LGIA engines will have 5% SPOC*.
We aim for the same heat rate as “fuel oil mode”. The ammonia engine concept will be based on the Liquid Gas Injection engine concept, which is well known from the existing methanol and LPG-fuelled Everllence B&W two-stroke dual-fuel engines.
*Performance values indicated refer to energy fraction for L1 rated engines operating at 100% load point in Tier II mode. Actual values may vary depending on engine rating and load conditions.
Fuel oil mode
In fuel oil mode, we target identical performance as a conventionally fuelled diesel engine
Zoom in on the development process of our ammonia engine
Safety and environmental compliance
Everllence combines proven emissions control systems with dedicated safety measures for ammonia-fuelled engines – ensuring reliable operation and full compliance with global marine regulations.
Engineered safety:
ammonia auxiliary system
The auxiliary systems have been optimized for the Everllence B&W ammonia engine and ensure safe and efficient operation. The ammonia catch system and the addition of absorbers make sure that no ammonia above 5 ppm will be vented to the atmosphere at our Research Centre Copenhagen. These engineered safety measures are critical for enabling ammonia as engine fuel at scale – while maintaining strict environmental protection standards.
Selective catalytic reduction technology
To reduce nitrogen oxide (NOₓ) emissions and to meet IMO Tier III emission regulations, ship engines from Everllence have been equipped with selective catalytic reduction (SCR) technology for many years. This after-treatment process removes NOₓ from the exhaust gas through catalytic reduction, and also eliminates ammonia slip from the exhaust.
SCR systems using urea were already introduced in the 1990s aboard four bulk carriers. Pending the outcome of full-scale ammonia engine testing, the SCR system volume and ammonia consumption may be adjusted to ensure Tier III compliance.
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Two-stroke ammonia engine achieves full-load operation at 100% power
Successful ammonia engine tests pave the way for zero-carbon propulsion
