NYK to Introduce World’s First Engine Air Compression System to Reduce Vessel GHG Emissions | NYK Line


Cross section view of the VCR system


NYK will install a variable compression ratio system (VCR system) on two large LNG-fueled coal carriers to be built at Oshima Shipbuilding Co., Ltd. The vessels are scheduled to be delivered by the end of 2025. This will be the first time for VCR systems to be installed on vessels, including existing vessels that use heavy fuel oil as their main fuel.

The VCR system can adjust the air compression ratio in the engine combustion chamber to an optimal balance according to engine power and LNG fuel properties. This optimal adjustment will improve fuel efficiency during operation by about 3% in LNG gas mode and about 6% in diesel oil mode.

The system is also expected to play an important role in reducing GHG emissions from existing ships and improving engine efficiency when decarbonized fuels are introduced.

Based on its technology and experience with large low-speed marine engines, Mitsui E&S DU Co., Ltd. developed the VCR system together with Winterthur Gas & Diesel Ltd, a Swiss engine licensor.

NYK is committed to deepening its partnerships with companies actively introducing and developing GHG reduction technologies and contributing to GHG reduction in the ocean shipping business.

Vessel fuel conversion scenario towards 2050


On March 10, 2023, the NYK Group released its medium-term management plan “Sail Green, Drive Transformations 2026 – A Passion for Planetary Wellbeing -.” The NYK Group is promoting growth strategies with ESG at the core, based on the Group’s basic philosophy of “Bringing value to life” and a new corporate vision for 2030, which reads, “we go beyond the scope of a comprehensive global logistics enterprise to co-create value required for the future by advancing our core business and growing new ones.”

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