Research of NOx reduction on a low-speed two-stroke marine diesel engine by using EGR (exhaust gas recirculation)-CB (cylinder bypass) and EGB (exhaust gas bypass)
Research of NOx reduction on a low-speed two-stroke marine diesel engine by using EGR (exhaust gas recirculation)-CB (cylinder bypass) and EGB (exhaust gas bypass)
复制标题
EGR（废气再循环）-CB（气缸旁路）和EGB（废气旁路）降低低速二冲程船用柴油机NOx研究
DOI：
10.1016/j.ijhydene.2017.06.009
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发表时间：
2017
影响因子：
7.2
通讯作者：
Zhu Yuanqing
中科院分区：
文献类型：
--
作者：
Wang Zhanguang;Zhou Song;Feng Yongming;Zhu Yuanqing
IMO Tier III于2016年1月1日实施，强制要求NOx ECA中低速船用柴油发动机（发动机转速低于130 rpm）的NOx排放量不得超过3.4 g/kWh。目前和近几十年来，船舶推进的最佳答案是低速二冲程柴油机。任何将NOx排放量减少到预期水平的减排技术都是可以允许的。EGR是一种有效的技术，已在汽车应用和船用柴油机（高速和中速）上得到验证。本文提出了一种降低NOx排放的内部措施：EGR（废气再循环）结合CB（气缸旁路）和EGB（废气旁路）。结合CB和EGB，EGR系统应用在发动机上可以降低NOx排放量低于3.4 g/kWh。为了测试EGR系统的效果，设置了三种模式：无EGR模式、低EGR模式和ECA-EGR模式。研究了不同工况对NOx排放、燃油消耗、发动机功率和排放的影响。结果表明，发动机在ECA-EGR模式下运行时，NOx排放能够满足IMO Tier III的要求。
IMO Tier III, applied on 1 January 2016, forced that NOx emissions must not exceed 3.4 g/kWh for low-speed marine diesel engines (engine speed lower than 130 rpm) in NOx ECAs. And the best answer for propulsion of nautical ships presently and for the near decades is the low-speed two-stroke diesel engines. Any abatement technology that reduces NOx emissions to the expected point can be allowed. EGR is an effective technology that has been verified on automotive applications and marine diesel engines (high speed and medium speed). This paper provides an internal measure: EGR (exhaust gas recirculation) combined with CB (cylinder bypass) and EGB (exhaust gas bypass) to reduce NOx emissions. Combined with CB and EGB, the EGR system applied on the engine can reduce the NOx emissions under 3.4 g/kWh. To test the effects of the EGR system, three modes were set: non-EGR mode, low-EGR mode and ECA-EGR mode. The effects of different modes on NOx emissions, fuel consumption, engine power and emissions are investigated. As a result, it can be concluded when the engine run in the ECA-EGR mode, NOx emissions can meet the requirements of IMO Tier III.