Numerical research of the injected exhaust gas recirculation strategy on a two-stroke low-speed marine diesel engine

Combined removal experiment of NOx, SO2 and PM from marine diesel exhaust gas with SCR-DryEGCS system

“…7 However, the treatment of NOx is relatively difficult 8 and there are currently two main technologies to reduce the NOx emission from ship exhaust to the IMO Tier III emission standard, namely selective catalytic reduction (SCR) 9–13 ,exhaust gas recirculation (EGR). 14–18 However, in terms of technical maturity and scope of application, SCR technology is the only IMO-approved NOx reduction technology that can be used on a wide range of ship engines and ship types. 19 Depending on the arrangement of the SCR system, marine SCR systems can be divided into high-pressure SCR (HP-SCR) system arranged in front of the turbocharger and low-pressure SCR (LP-SCR) system arranged after the turbocharger.…”

Numerical Research on Effects of Variable Port Timing on Performance of Marine Low-Speed Two-Stroke Engine

“…Then, they proposed an Injected Exhaust Gas Recirculation (IEGR) strategy, which not only augmented the in-cylinder swirl ratio, but also enabled a stratified EGR distribution. Their research underscored the potential of stratified EGR: by tailoring the fuel injection angle, the main combustion process could be confined to regions with high EGR rates while optimizing NOx reduction [10]. To alleviate the problem of extra blower power consumption, the Cylinder Gas Recirculation (CGR) strategy was introduced to enhance the swirl motion in the cylinder by using a differential pressure-driven self-circulation of the gas.…”