NOx Reduction of Marine Low Speed Diesel Engine with Low Pressure EGR

Abstract

To comply with the IMO Tier III regulations, Japan Engine Corporation (J-ENG) has developed a new and unique exhaust emission reduction technology “Low Pressure Exhaust Gas Recirculation (LP-EGR) system”. J-ENG’s LP-EGR system is a system which generation of NOx is suppressed by changing combustion condition inside an engine, by means of recirculating a part of low pressure exhaust gas emitted from an engine turbocharger outlet to a turbocharger intake after scrubbed by the EGR scrubber. Now, we have applied integrated on-engine LP-EGR system into a commercial engine 6UEC45LSE-Eco-B2 aiming for onboard durability confirmation. As a result of its shop test, we confirmed its NOx emission amount complied with the IMO Tier III regulations in witness whereof the ClassNK and that the increase of fuel oil consumption was less than approximately 1%. After installing the system onto a 34,000DWT Bulk Carrier, we are now conducting a long-term durability confirmation during commercial voyages. Since J-ENG’s LP-EGR system utilizes low pressure exhaust gas as the EGR gas, it is easy installed on any type of engines and for this reason, we are confident that it will spread widely in the near future.