Evaluation of Emissions Characteristics of Marine Diesel Engine Intake of Exhaust Gas of Lean Burn Gas Engine
Evaluation of Emissions Characteristics of Marine Diesel Engine Intake of Exhaust Gas of Lean Burn Gas Engine
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DOI：
10.1115/1.4037868
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发表时间：
2018-02-01
影响因子：
1.5
通讯作者：
Yamasaki, Yudai
中科院分区：
文献类型：
--
作者：
Nitta, Yoshifuru;Yoo, Dong-Hoon;Yamasaki, Yudai
减少氮氧化物（NOx）、硫氧化物（SOx）和二氧化碳（CO2）排放的必要性已在全球范围内得到承认。然而，使用传统的船用柴油机很难满足强化的排放法规。因此，稀薄燃烧气体发动机近来在海运业中引起了关注。因为它们使用天然气作为燃料，可以同时减少NOx和CO2的排放。另一方面，由于甲烷是天然气的主要成分，因此从稀燃燃气发动机排放的未燃烧的甲烷即泄漏的甲烷可能对全球变暖具有潜在影响。提出了一种组合式排气再循环（C-EGR）系统，利用鼓风机将稀薄燃气发动机的排气送至船用柴油机的进气歧管，以减少燃气发动机的甲烷泄漏和船用柴油机的NOx排放。由于燃气发动机排放的废气中含有逃逸的甲烷，该系统可以同时降低船用柴油机的NOx和稀燃发动机的逃逸甲烷。本文介绍了所提出的C-EGR系统的细节，并给出了C-EGR系统的排放特性的实验结果。结果，证实了C-EGR系统实现了进气中的逃逸甲烷的75%以上的减少。此外，从柴油机的NOx排放降低的废气再循环（EGR）系统的效果。
The need for reductions of nitrogen oxides (NOx), sulfur oxides (SOx), and carbon dioxide (CO2) emissions has been acknowledged on the global level. However, it is difficult to meet the strengthened emissions regulations by using the conventional marine diesel engines. Therefore, lean burn gas engines have been recently attracting attention in the maritime industry. Because they use natural gas as fuel and can simultaneously reduce both NOx and CO2 emissions. On the other hand, since methane is the main component of natural gas, the slipped methane, which is the unburned methane emitted from the lean burn gas engines, might have a potential impact on global warming. The authors have proposed a combined exhaust gas recirculation (C-EGR) system to reduce the slipped methane from the gas engines and NOx from marine diesel engines by providing the exhaust gas from lean burn gas engine to the intake manifold of the marine diesel engine using a blower. Since the exhaust gas from the gas engine includes slipped methane, this system could reduce both the NOx from the marine diesel engine and the slipped methane from the lean burn gas engine simultaneously. This paper introduces the details of the proposed C-EGR system and presents the experimental results of emissions characteristics on the C-EGR system. As a result, it was confirmed that the C-EGR system attained more than 75% reduction of the slipped methane in the intake gas. Additionally, the NOx emission from the diesel engine decreased with the effect of the exhaust gas recirculation (EGR) system.