NOx Reduction from Marine Diesels under Lower-load Conditions via Utilization of Closely-aligned Double-needle Inje ctor

针对大型船用柴油机特别是在低负荷工况下，传统的EGR或SCR等措施难以奏效的问题，提出了一种利用低十六烷数、低硫含量轻循环油（LCO）的PCCI燃烧的新方法。采用双针喷射器对喷雾进行方向控制，避免了壁面润湿，促进了混合液分层。此外，由于LCO的水乳化作用延长了点火延迟时间，首次实现了海上空气污染的实用经济解决方案。

A novel approach, which utilizes the PCCI combustion of Light Cycle Oil (LCO) of low-cetane number and low-sulfur content, is proposed to overcome the antipollution difficulties in large marine diesels especially under lower-load conditions where the conventional measures such as EGR or SCR are hard to be effective. Direction control of spray propagation was introduced via merging sprays from a closely-aligned double-needle injector to avoid wall wetting and to promote mixture stratification. Also thanks to water emulsification of LCO lengthening the ignition delay, practical and economical solution against air pollution in marine sector is within reach for the first time.