NYK to induct the world’s first engine air compression system

Nippon Yusen Kaisha (NYK) is likely to install a variable compression ratio system (VCR system) on large two-LNG-fuelled coal carriers that is being developed at Oshima Shipbuilding. The vessels are to be delivered by the end of 2025 and are the first to have VCR systems installed. In addition, it also includes the existing vessels that use heavy fuel oil as the main fuel.

The VCR system is developed by Mitsui E&S DU and Winterthur Gas & Diesel and can adjust the air compression ratio in the engine combustion chamber following the engine power and LNG fuel properties. The optimal balance will enhance fuel efficiency with 3% in LNG gas mode and 6% in diesel oil mode during operations.