IMO NOx Tier III対応　低圧EGRシステム

抄録

To comply with IMO NOx Tier III regulations, Mitsubishi Heavy Industries Marine Machinery & Engine Co., Ltd. has developed a new and unique technology called “Low Pressure Exhaust Gas Recirculation (LP-EGR) system”. The Mitsubishi LP-EGR system is a system which recirculates a part of the low pressure exhaust gas emitted from an engine turbocharger outlet into a turbocharger intake after scrubbed by an EGR scrubber. Now, we have applied integrated on-engine LP-EGR system into a commercial engine 6UEC45LSE-Eco-B2 aiming for onboard durability confirmation. We confirmed its NOx emission level was complied with IMO Tier III regulations and the increase of fuel oil consumption was less than approximately 1%. Adaptation of the LP- EGR system into IMO NOx Tier III regulations is the world’s first effort for marine low speed two-stroke diesel engine.

Furthermore, we installed the system into a 34,000DWT Bulk Carrier and now are conducting long-term durability confirmation during the sea trial and commercial voyages. The installation of the LP-EGR system complied with IMO NOx Tier III regulations into an actual vessel is also the world’s first effort for marine low speed two-stroke diesel engine.