Effects of Engine Operating Conditions on Nitrous Oxide Emission Characteristics of Ship

• Yoo Dong-Hoon

  海上技術安全研究所

• Hayashi Mitsuru

  神戸大学　自然科学系先端融合研究環　内海　域環境教育研究センター

• Nitta Yoshifuru

  海上技術安全研究所

• Fujita Hirotsugu

  神戸大学大学院海事科学研究科

Bibliographic Information

Other Title

• 船舶運航条件が亜酸化窒素排出に及ぼす影響

Abstract

 Diesel engines are used as the main power source of marine transport and the continuous improvement of their performance offers better specific fuel oil consumption (SFOC). From the standpoint of Carbon Dioxide (CO₂) emission, marine engines are environment friendly compared to those used in land transportation and other industries. Attention should be focused only on CO₂ emissions but also on other greenhouse gases (GHG), such as Nitrous Oxide (N₂O), which is the result of a reaction between nitrogen and sulfur components of low-grade fuels.<br> N₂O is known as the third major GHG following CO₂ and methane (CH⁴). The global warming potential (GWP) of N₂O is 310 times as large as that of CO₂ because N₂O in the atmosphere is very stable, and it becomes a source of secondary contamination after photo-degradation in the stratosphere. N₂O concentration 1800 years before was less than 280 ppb, but in the last 200 years it has increased rapidly. Since N₂O emission from natural sources is very difficult to control, discussions on N₂O emission reductions should be centered on artificial N₂O which represents 35% of the total N₂O emissions. To argue this point, it should be noted that there are some reports on the N₂O exhaust characteristics from stationary power plants and land transportations, but those of marine transportations are very limited.<br> In this experimental study, the authors investigated N₂O emission characteristics of an actual ship at the sea, and examined relationships between N₂O and other gaseous emissions. The experimental results showed that N₂O emission exhibited different characteristics compared with NO which makes up over 80 percent in NO_X, and had exhaust characteristic very similar to SO₂ emission. But when based on the excess air ratio, the difference between these two species increased with decreasing excess air ratio.

Journal

• Marine Engineering

  Marine Engineering 48 (5), 692-698, 2013

  The Japan Institute of Marine Engineering

Details

• CRID: 1390282679548038144
• NII Article ID: 130004688418
• DOI: 10.5988/jime.48.692
• ISSN: 18843778
• ISSN: 13461427
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed