船舶運航条件が亜酸化窒素排出に及ぼす影響

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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. 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. 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 NOX, 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.
公益社団法人日本マリンエンジニアリング学会の論文

船舶運航条件が亜酸化窒素排出に及ぼす影響

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